vectorizer-sdk 3.3.0

//! Data models for the Vectorizer SDK

use std::collections::HashMap;

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};

// Re-export hybrid search models
pub mod hybrid_search;
pub use hybrid_search::*;

// Re-export graph models
pub mod graph;
pub use graph::*;

// Re-export file upload models
pub mod file_upload;
pub use file_upload::*;

// Typed Qdrant-compatible filter builder (phase23).
// Exposed as `vectorizer_sdk::models::filter` so callers do not need
// to depend on the server crate directly.
pub mod filter;
pub use filter::{
    QdrantCondition, QdrantFilter, QdrantGeoBoundingBox, QdrantGeoPoint, QdrantGeoRadius,
    QdrantMatchValue, QdrantRange, QdrantValuesCount,
};

// ===== TIER-CONTROL REPORTS (phase13) =====

/// Aggregate outcome of a `delete_by_filter` call against
/// `POST /collections/{name}/vectors/delete_by_filter`.
///
/// Server contract: `{scanned, matched, deleted, results}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct DeleteByFilterReport {
    /// Total vectors scanned by the filter pass.
    pub scanned: usize,
    /// Vectors that matched the filter predicate.
    pub matched: usize,
    /// Vectors successfully deleted.
    pub deleted: usize,
    /// Per-id outcomes for matched vectors.
    #[serde(default)]
    pub results: Vec<serde_json::Value>,
}

/// Aggregate outcome of a `bulk_update_metadata` call against
/// `POST /collections/{name}/vectors/bulk_update_metadata`.
///
/// Server contract: `{scanned, matched, updated, results}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct BulkUpdateReport {
    /// Total vectors scanned by the filter pass.
    pub scanned: usize,
    /// Vectors that matched the filter predicate.
    pub matched: usize,
    /// Vectors whose metadata was successfully updated.
    pub updated: usize,
    /// Per-id outcomes for matched vectors.
    #[serde(default)]
    pub results: Vec<serde_json::Value>,
}

/// Aggregate outcome of a `copy_vectors` call against
/// `POST /collections/{src}/vectors/copy`.
///
/// Server contract: `{src, dst, requested, copied, failed, results}`.
/// Per-id status: `ok | missing_in_src | dst_insert_failed`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct CopyReport {
    /// Source collection name, echoed by the server.
    pub src: String,
    /// Destination collection name, echoed by the server.
    pub dst: String,
    /// Total ids the request asked to copy.
    pub requested: usize,
    /// Successfully copied ids.
    pub copied: usize,
    /// Ids that failed at any step.
    pub failed: usize,
    /// Per-id outcomes, in request order.
    pub results: Vec<VectorOpResult>,
}

/// Job descriptor returned by `reencode_collection` against
/// `POST /collections/{name}/reencode`.
///
/// Server contract: `{job_id, collection, state, target_encoding, progress}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ReencodeJob {
    /// Opaque job id generated by the server.
    pub job_id: String,
    /// Collection being re-encoded.
    pub collection: String,
    /// Job state string (e.g. `"completed"`).
    pub state: String,
    /// Target encoding requested (e.g. `"sq8"`, `"binary"`, `"fp32"`).
    pub target_encoding: String,
    /// Progress fraction in `[0.0, 1.0]`.
    pub progress: f64,
}

// ===== TIER-DEMOTION REPORTS (issue #265) =====

/// Per-vector outcome for a `delete_vectors` or `move_to_collection`
/// call. The `status` string is one of:
///
/// - `ok` — vector was deleted (delete) or moved (move) successfully.
/// - `missing_in_src` — id was not present in the source collection.
/// - `dst_insert_failed` — destination rejected the insert (move only;
///   typically a dim/encoding mismatch).
/// - `src_delete_failed` — destination accepted the insert but the
///   source delete failed (move only; the vector now exists in BOTH
///   collections — recoverable on retry).
/// - `error` — generic per-id failure (delete only).
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct VectorOpResult {
    /// Vector id this row refers to. May be missing when the request
    /// payload contained a non-string entry that the server rejected.
    #[serde(default)]
    pub id: Option<String>,

    /// One of `ok | missing_in_src | dst_insert_failed |
    /// src_delete_failed | error` — see [`VectorOpResult`] doc.
    pub status: String,

    /// Server-side error message, populated when `status != "ok"`.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub error: Option<String>,

    /// Index of this entry in the request's `ids` array (delete only).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub index: Option<usize>,
}

/// Aggregate outcome of a `delete_vectors` call against
/// `POST /batch_delete`. Mirrors the server contract:
/// `{collection, count, deleted, failed, results}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct DeleteReport {
    /// Source collection name, echoed by the server.
    pub collection: String,
    /// Total ids the request asked to delete.
    #[serde(default)]
    pub count: usize,
    /// Successfully deleted ids.
    pub deleted: usize,
    /// Ids that failed (missing or backend error).
    pub failed: usize,
    /// Per-id outcomes, in request order.
    pub results: Vec<VectorOpResult>,
}

/// Aggregate outcome of a `move_to_collection` call against
/// `POST /collections/{src}/vectors/move` (issue #265).
///
/// Server invariant: vectors are inserted into `dst` BEFORE being
/// deleted from `src`, so a mid-batch failure leaves a recoverable
/// duplicate (never data loss). Per-id failures populate `results`
/// without aborting the batch — operators chasing tier-demotion sweeps
/// want partial progress, not an abort-on-first-error contract.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct MoveReport {
    /// Source collection name, echoed by the server.
    pub src: String,
    /// Destination collection name, echoed by the server.
    pub dst: String,
    /// Total ids the request asked to move.
    pub requested: usize,
    /// Successfully moved ids (insert + delete both succeeded).
    pub moved: usize,
    /// Ids that failed at any step.
    pub failed: usize,
    /// Per-id outcomes, in request order.
    pub results: Vec<VectorOpResult>,
}

// ===== CLIENT-SIDE REPLICATION CONFIGURATION =====

/// Read preference for routing read operations.
/// Similar to MongoDB's read preferences.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum ReadPreference {
    /// Route all reads to master
    Master,
    /// Route reads to replicas (round-robin)
    #[default]
    Replica,
    /// Route to the node with lowest latency
    Nearest,
}

/// Host configuration for master/replica topology.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HostConfig {
    /// Master node URL (receives all write operations)
    pub master: String,
    /// Replica node URLs (receive read operations based on read_preference)
    pub replicas: Vec<String>,
}

/// Options that can be passed to read operations for per-operation override.
#[derive(Debug, Clone, Default)]
pub struct ReadOptions {
    /// Override the default read preference for this operation
    pub read_preference: Option<ReadPreference>,
}

/// Vector similarity metrics
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum SimilarityMetric {
    /// Cosine similarity
    #[default]
    Cosine,
    /// Euclidean distance
    Euclidean,
    /// Dot product
    DotProduct,
}

/// Vector representation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Vector {
    /// Unique identifier for the vector
    pub id: String,
    /// Vector data as an array of numbers
    pub data: Vec<f32>,
    /// Optional metadata associated with the vector
    pub metadata: Option<HashMap<String, serde_json::Value>>,
    /// Optional ECC public key for payload encryption (PEM, base64, or hex format)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub public_key: Option<String>,
}

/// Collection representation
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Collection {
    /// Collection name
    pub name: String,
    /// Vector dimension
    pub dimension: usize,
    /// Similarity metric used for search (API may return as 'metric')
    #[serde(alias = "similarity_metric")]
    pub metric: Option<String>,
    /// Optional description
    #[serde(default)]
    pub description: Option<String>,
    /// Creation timestamp
    #[serde(default)]
    pub created_at: Option<String>,
    /// Last update timestamp
    #[serde(default)]
    pub updated_at: Option<String>,
    /// Vector count
    #[serde(default)]
    pub vector_count: usize,
    /// Document count
    #[serde(default)]
    pub document_count: usize,
    /// Embedding provider
    #[serde(default)]
    pub embedding_provider: Option<String>,
    /// Indexing status
    #[serde(default)]
    pub indexing_status: Option<serde_json::Value>,
    /// Normalization config
    #[serde(default)]
    pub normalization: Option<serde_json::Value>,
    /// Quantization config
    #[serde(default)]
    pub quantization: Option<serde_json::Value>,
    /// Size info
    #[serde(default)]
    pub size: Option<serde_json::Value>,
    /// Per-collection vector-count ring buffer (phase25 §6). At most
    /// 60 samples, one per minute, sampled lazily on
    /// `GET /collections/{name}` requests. Empty array on older
    /// servers or for collections that have never been read.
    #[serde(default)]
    pub vector_count_history: Vec<VectorCountSample>,
}

/// One sample in the per-collection vector-count history (phase25 §6).
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq)]
pub struct VectorCountSample {
    /// Sample timestamp in unix seconds.
    pub at: u64,
    /// Vector count at the time of the sample.
    pub count: usize,
}

/// Collection information.
///
/// The v3.0.0 REST surface returns `metric` in Rust-Debug form
/// (e.g. `"Cosine"`), plus new top-level blocks (`size`, `quantization`,
/// `normalization`, `status`). Every field beyond `name` + `dimension`
/// carries `#[serde(default)]` so the model tolerates pre-v3 servers
/// and future additions (request models keep the strict posture; this
/// is a response-only struct).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollectionInfo {
    /// Collection name
    pub name: String,
    /// Vector dimension
    pub dimension: usize,
    /// Similarity metric used for search. The v3 server emits this in
    /// Rust-Debug form (`"Cosine"` / `"Euclidean"` / `"DotProduct"`);
    /// callers that compare against `"cosine"` etc. should go through
    /// `.to_lowercase()`.
    #[serde(default, alias = "similarity_metric")]
    pub metric: String,
    /// Number of vectors in the collection
    #[serde(default)]
    pub vector_count: usize,
    /// Number of documents in the collection
    #[serde(default)]
    pub document_count: usize,
    /// Creation timestamp (RFC3339). Optional — pre-v3 servers may omit.
    #[serde(default)]
    pub created_at: String,
    /// Last update timestamp (RFC3339). Optional — pre-v3 servers may omit.
    #[serde(default)]
    pub updated_at: String,
    /// Indexing status. Absent on the v3 server; some legacy servers send it.
    #[serde(default)]
    pub indexing_status: Option<IndexingStatus>,
    /// Size block emitted by v3 (`{total, total_bytes, index, index_bytes,
    /// payload, payload_bytes}`).
    #[serde(default)]
    pub size: Option<serde_json::Value>,
    /// Quantization block emitted by v3 (`{enabled, type, bits}`).
    #[serde(default)]
    pub quantization: Option<serde_json::Value>,
    /// Normalization block emitted by v3.
    #[serde(default)]
    pub normalization: Option<serde_json::Value>,
    /// Ready/indexing/error state emitted by v3.
    #[serde(default)]
    pub status: Option<String>,
}

/// Indexing status.
///
/// Every field carries `#[serde(default)]` to match the tolerant
/// posture of the parent [`CollectionInfo`] — the v3 server emits a
/// subset of this shape (`status`/`progress`/`total_documents`/
/// `processed_documents` plus some extra keys this struct doesn't
/// model) and omits `vector_count` and `last_updated`, which used to
/// make `serde_json::from_str::<CollectionInfo>` fail on a
/// `Collection → JSON → CollectionInfo` round-trip through
/// `Collection::indexing_status: Option<serde_json::Value>` that
/// preserves the server's partial shape.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IndexingStatus {
    /// Status
    #[serde(default)]
    pub status: String,
    /// Progress percentage
    #[serde(default)]
    pub progress: f32,
    /// Total documents
    #[serde(default)]
    pub total_documents: usize,
    /// Processed documents
    #[serde(default)]
    pub processed_documents: usize,
    /// Vector count
    #[serde(default)]
    pub vector_count: usize,
    /// Estimated time remaining
    #[serde(default)]
    pub estimated_time_remaining: Option<String>,
    /// Last updated timestamp
    #[serde(default)]
    pub last_updated: String,
}

/// Search result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SearchResult {
    /// Vector ID
    pub id: String,
    /// Similarity score
    pub score: f32,
    /// Vector content (if available)
    pub content: Option<String>,
    /// Optional metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

/// Search response.
///
/// `query_time_ms` defaults to `0.0` because the v3.0.x server's text
/// search handler doesn't emit it — callers that need elapsed timing
/// should measure client-side. Same tolerance applies to the
/// additional diagnostic fields the server may add in later versions.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SearchResponse {
    /// Search results.
    #[serde(default)]
    pub results: Vec<SearchResult>,
    /// Query time in milliseconds (server-reported; 0.0 when the
    /// server omits it).
    #[serde(default)]
    pub query_time_ms: f64,
    /// Echo of the original query string, if the server returned one.
    #[serde(default)]
    pub query: Option<String>,
    /// Echo of the requested result limit, if the server returned one.
    #[serde(default)]
    pub limit: Option<usize>,
    /// Echo of the collection name, if the server returned one.
    #[serde(default)]
    pub collection: Option<String>,
}

/// Embedding request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EmbeddingRequest {
    /// Text to embed
    pub text: String,
    /// Optional model to use for embedding
    pub model: Option<String>,
    /// Optional parameters for embedding generation
    pub parameters: Option<EmbeddingParameters>,
}

/// Embedding parameters
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EmbeddingParameters {
    /// Maximum sequence length
    pub max_length: Option<usize>,
    /// Whether to normalize the embedding
    pub normalize: Option<bool>,
    /// Optional prefix for the text
    pub prefix: Option<String>,
}

/// Embedding response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct EmbeddingResponse {
    /// Generated embedding vector
    pub embedding: Vec<f32>,
    /// Model used for embedding
    pub model: String,
    /// Text that was embedded
    pub text: String,
    /// Embedding dimension
    pub dimension: usize,
    /// Provider used
    pub provider: String,
}

/// Health status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HealthStatus {
    /// Service status
    pub status: String,
    /// Service version
    pub version: String,
    /// Timestamp
    pub timestamp: String,
    /// Uptime in seconds
    pub uptime: Option<u64>,
    /// Number of collections
    pub collections: Option<usize>,
    /// Total number of vectors
    pub total_vectors: Option<usize>,
}

/// Collections list response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollectionsResponse {
    /// List of collections
    pub collections: Vec<Collection>,
}

/// Create collection response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateCollectionResponse {
    /// Success message
    pub message: String,
    /// Collection name
    pub collection: String,
}

/// Database statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DatabaseStats {
    /// Total number of collections
    pub total_collections: usize,
    /// Total number of vectors
    pub total_vectors: usize,
    /// Total memory estimate in bytes
    pub total_memory_estimate_bytes: usize,
    /// Collections information
    pub collections: Vec<CollectionStats>,
}

/// Collection statistics
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollectionStats {
    /// Collection name
    pub name: String,
    /// Number of vectors
    pub vector_count: usize,
    /// Vector dimension
    pub dimension: usize,
    /// Memory estimate in bytes
    pub memory_estimate_bytes: usize,
}

/// Batch text request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchTextRequest {
    /// Text ID
    pub id: String,
    /// Text content
    pub text: String,
    /// Optional metadata
    pub metadata: Option<HashMap<String, String>>,
}

/// Batch configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchConfig {
    /// Maximum batch size
    pub max_batch_size: Option<usize>,
    /// Number of parallel workers
    pub parallel_workers: Option<usize>,
    /// Whether operations should be atomic
    pub atomic: Option<bool>,
}

/// Batch insert request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchInsertRequest {
    /// Texts to insert
    pub texts: Vec<BatchTextRequest>,
    /// Batch configuration
    pub config: Option<BatchConfig>,
}

/// Batch response.
///
/// Tolerant of both the old (pre-v3) `{success, operation, total_operations,
/// successful_operations, failed_operations, duration_ms, errors}` shape
/// and the v3.0.x server's `/insert_texts` response
/// `{collection, count, inserted, failed, results}`. All fields default to
/// empty/zero/false when absent so callers can match on whichever pair the
/// running server emits without branching on version.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchResponse {
    /// Whether the operation was successful (pre-v3 shape; v3 emits
    /// `inserted`/`failed` instead — left `false` and the caller
    /// should inspect `successful_operations > 0 && failed_operations == 0`).
    #[serde(default)]
    pub success: bool,
    /// Collection name (both shapes emit this).
    #[serde(default)]
    pub collection: String,
    /// Operation type (pre-v3 only; v3 omits).
    #[serde(default)]
    pub operation: String,
    /// Total number of operations (pre-v3 shape). v3 emits `count` —
    /// normalised into this field via the alias.
    #[serde(default, alias = "count")]
    pub total_operations: usize,
    /// Number of successful operations (pre-v3 shape). v3 emits
    /// `inserted` — aliased so either maps onto this field.
    #[serde(default, alias = "inserted")]
    pub successful_operations: usize,
    /// Number of failed operations. Same field name in both shapes.
    #[serde(default, alias = "failed")]
    pub failed_operations: usize,
    /// Duration in milliseconds (pre-v3 only).
    #[serde(default)]
    pub duration_ms: u64,
    /// Error messages (pre-v3 shape).
    #[serde(default)]
    pub errors: Vec<String>,
    /// Per-entry result records emitted by v3 `/insert_texts`. Each
    /// record carries the client-sent id (`client_id`) and the
    /// server-assigned UUIDs under `vector_ids`; use this when the
    /// server reassigns ids on insert.
    #[serde(default)]
    pub results: Vec<BatchResultEntry>,
}

/// One entry in `BatchResponse::results` as emitted by the v3
/// `/insert_texts` handler. Carries the client-provided id alongside
/// the server-assigned vector UUID(s) so callers can round-trip the
/// mapping when they need idempotency by client id.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchResultEntry {
    /// Original `id` the caller sent in `BatchTextRequest`.
    #[serde(default)]
    pub client_id: String,
    /// Zero-based index of the entry in the original batch.
    #[serde(default)]
    pub index: usize,
    /// `"ok"` or `"error"`.
    #[serde(default)]
    pub status: String,
    /// Whether the server chunked the input (long text → multiple
    /// vectors).
    #[serde(default)]
    pub chunked: bool,
    /// Server-assigned UUID(s) — one element unless `chunked` is true.
    #[serde(default)]
    pub vector_ids: Vec<String>,
    /// Count of vectors created for this entry (≥1 if `chunked`).
    #[serde(default)]
    pub vectors_created: usize,
    /// Populated only on `status == "error"`.
    #[serde(default)]
    pub error: Option<String>,
}

/// Batch search request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchSearchRequest {
    /// Search queries
    pub queries: Vec<BatchSearchQuery>,
    /// Batch configuration
    pub config: Option<BatchConfig>,
}

/// Batch search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchSearchResponse {
    /// Whether the operation was successful
    pub success: bool,
    /// Collection name
    pub collection: String,
    /// Total number of queries
    pub total_queries: usize,
    /// Number of successful queries
    pub successful_queries: usize,
    /// Number of failed queries
    pub failed_queries: usize,
    /// Duration in milliseconds
    pub duration_ms: u64,
    /// Search results
    pub results: Vec<Vec<SearchResult>>,
    /// Error messages
    pub errors: Vec<String>,
}

/// Batch vector update
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchVectorUpdate {
    /// Vector ID
    pub id: String,
    /// New vector data (optional)
    pub data: Option<Vec<f32>>,
    /// New metadata (optional)
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

/// Batch update request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchUpdateRequest {
    /// Vector updates
    pub updates: Vec<BatchVectorUpdate>,
    /// Batch configuration
    pub config: Option<BatchConfig>,
}

/// Batch delete request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchDeleteRequest {
    /// Vector IDs to delete
    pub vector_ids: Vec<String>,
    /// Batch configuration
    pub config: Option<BatchConfig>,
}

/// Summarization methods
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "snake_case")]
pub enum SummarizationMethod {
    /// Extractive summarization
    #[default]
    Extractive,
    /// Keyword summarization
    Keyword,
    /// Sentence summarization
    Sentence,
    /// Abstractive summarization
    Abstractive,
}

/// Summarize text request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SummarizeTextRequest {
    /// Text to summarize
    pub text: String,
    /// Summarization method
    pub method: Option<SummarizationMethod>,
    /// Maximum summary length
    pub max_length: Option<usize>,
    /// Compression ratio
    pub compression_ratio: Option<f32>,
    /// Language code
    pub language: Option<String>,
}

/// Summarize text response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SummarizeTextResponse {
    /// Summary ID
    pub summary_id: String,
    /// Original text
    pub original_text: String,
    /// Generated summary
    pub summary: String,
    /// Method used
    pub method: String,
    /// Original text length
    pub original_length: usize,
    /// Summary length
    pub summary_length: usize,
    /// Compression ratio
    pub compression_ratio: f32,
    /// Language
    pub language: String,
    /// Status
    pub status: String,
    /// Message
    pub message: String,
    /// Metadata
    pub metadata: HashMap<String, String>,
}

/// Summarize context request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SummarizeContextRequest {
    /// Context to summarize
    pub context: String,
    /// Summarization method
    pub method: Option<SummarizationMethod>,
    /// Maximum summary length
    pub max_length: Option<usize>,
    /// Compression ratio
    pub compression_ratio: Option<f32>,
    /// Language code
    pub language: Option<String>,
}

/// Summarize context response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SummarizeContextResponse {
    /// Summary ID
    pub summary_id: String,
    /// Original context
    pub original_context: String,
    /// Generated summary
    pub summary: String,
    /// Method used
    pub method: String,
    /// Original context length
    pub original_length: usize,
    /// Summary length
    pub summary_length: usize,
    /// Compression ratio
    pub compression_ratio: f32,
    /// Language
    pub language: String,
    /// Status
    pub status: String,
    /// Message
    pub message: String,
    /// Metadata
    pub metadata: HashMap<String, String>,
}

/// Get summary response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GetSummaryResponse {
    /// Summary ID
    pub summary_id: String,
    /// Original text
    pub original_text: String,
    /// Generated summary
    pub summary: String,
    /// Method used
    pub method: String,
    /// Original text length
    pub original_length: usize,
    /// Summary length
    pub summary_length: usize,
    /// Compression ratio
    pub compression_ratio: f32,
    /// Language
    pub language: String,
    /// Creation timestamp
    pub created_at: String,
    /// Metadata
    pub metadata: HashMap<String, String>,
    /// Status
    pub status: String,
}

/// Summary info
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SummaryInfo {
    /// Summary ID
    pub summary_id: String,
    /// Method used
    pub method: String,
    /// Language
    pub language: String,
    /// Original text length
    pub original_length: usize,
    /// Summary length
    pub summary_length: usize,
    /// Compression ratio
    pub compression_ratio: f32,
    /// Creation timestamp
    pub created_at: String,
    /// Metadata
    pub metadata: HashMap<String, String>,
}

/// List summaries response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ListSummariesResponse {
    /// List of summaries
    pub summaries: Vec<SummaryInfo>,
    /// Total count
    pub total_count: usize,
    /// Status
    pub status: String,
}

/// Indexing progress
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IndexingProgress {
    /// Whether indexing is in progress
    pub is_indexing: bool,
    /// Overall status
    pub overall_status: String,
    /// Collections being indexed
    pub collections: Vec<CollectionProgress>,
}

/// Collection progress
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CollectionProgress {
    /// Collection name
    pub collection_name: String,
    /// Status
    pub status: String,
    /// Progress percentage
    pub progress: f32,
    /// Vector count
    pub vector_count: usize,
    /// Error message if any
    pub error_message: Option<String>,
    /// Last updated timestamp
    pub last_updated: String,
}

// ===== INTELLIGENT SEARCH MODELS =====

/// Intelligent search request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntelligentSearchRequest {
    /// Search query
    pub query: String,
    /// Collections to search (optional - searches all if not specified)
    pub collections: Option<Vec<String>>,
    /// Maximum number of results
    pub max_results: Option<usize>,
    /// Enable domain expansion
    pub domain_expansion: Option<bool>,
    /// Enable technical focus
    pub technical_focus: Option<bool>,
    /// Enable MMR diversification
    pub mmr_enabled: Option<bool>,
    /// MMR balance parameter (0.0-1.0)
    pub mmr_lambda: Option<f32>,
}

/// Semantic search request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SemanticSearchRequest {
    /// Search query
    pub query: String,
    /// Collection to search
    pub collection: String,
    /// Maximum number of results
    pub max_results: Option<usize>,
    /// Enable semantic reranking
    pub semantic_reranking: Option<bool>,
    /// Enable cross-encoder reranking
    pub cross_encoder_reranking: Option<bool>,
    /// Minimum similarity threshold
    pub similarity_threshold: Option<f32>,
}

/// Contextual search request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ContextualSearchRequest {
    /// Search query
    pub query: String,
    /// Collection to search
    pub collection: String,
    /// Metadata-based context filters
    pub context_filters: Option<HashMap<String, serde_json::Value>>,
    /// Maximum number of results
    pub max_results: Option<usize>,
    /// Enable context-aware reranking
    pub context_reranking: Option<bool>,
    /// Weight of context factors (0.0-1.0)
    pub context_weight: Option<f32>,
}

/// Multi-collection search request
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MultiCollectionSearchRequest {
    /// Search query
    pub query: String,
    /// Collections to search
    pub collections: Vec<String>,
    /// Maximum results per collection
    pub max_per_collection: Option<usize>,
    /// Maximum total results
    pub max_total_results: Option<usize>,
    /// Enable cross-collection reranking
    pub cross_collection_reranking: Option<bool>,
}

/// Intelligent search result
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntelligentSearchResult {
    /// Result ID
    pub id: String,
    /// Similarity score
    pub score: f32,
    /// Result content
    pub content: String,
    /// Metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
    /// Collection name
    pub collection: Option<String>,
    /// Query used for this result
    pub query_used: Option<String>,
}

/// Intelligent search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct IntelligentSearchResponse {
    /// Search results
    pub results: Vec<IntelligentSearchResult>,
    /// Total number of results found
    pub total_results: usize,
    /// Search duration in milliseconds
    pub duration_ms: u64,
    /// Queries generated
    pub queries_generated: Option<Vec<String>>,
    /// Collections searched
    pub collections_searched: Option<Vec<String>>,
    /// Search metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

/// Semantic search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SemanticSearchResponse {
    /// Search results
    pub results: Vec<IntelligentSearchResult>,
    /// Total number of results found
    pub total_results: usize,
    /// Search duration in milliseconds
    pub duration_ms: u64,
    /// Collection searched
    pub collection: String,
    /// Search metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

/// Contextual search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ContextualSearchResponse {
    /// Search results
    pub results: Vec<IntelligentSearchResult>,
    /// Total number of results found
    pub total_results: usize,
    /// Search duration in milliseconds
    pub duration_ms: u64,
    /// Collection searched
    pub collection: String,
    /// Context filters applied
    pub context_filters: Option<HashMap<String, serde_json::Value>>,
    /// Search metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

/// Multi-collection search response
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct MultiCollectionSearchResponse {
    /// Search results
    pub results: Vec<IntelligentSearchResult>,
    /// Total number of results found
    pub total_results: usize,
    /// Search duration in milliseconds
    pub duration_ms: u64,
    /// Collections searched
    pub collections_searched: Vec<String>,
    /// Results per collection
    pub results_per_collection: Option<HashMap<String, usize>>,
    /// Search metadata
    pub metadata: Option<HashMap<String, serde_json::Value>>,
}

// ==================== REPLICATION MODELS ====================

/// Status of a replica node
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "PascalCase")]
pub enum ReplicaStatus {
    /// Replica is connected and healthy
    Connected,
    /// Replica is syncing data
    Syncing,
    /// Replica is lagging behind master
    Lagging,
    /// Replica is disconnected
    Disconnected,
}

/// Information about a replica node
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicaInfo {
    /// Unique identifier for the replica
    pub replica_id: String,
    /// Hostname or IP address of the replica
    pub host: String,
    /// Port number of the replica
    pub port: u16,
    /// Current status of the replica
    pub status: String,
    /// Timestamp of last heartbeat
    pub last_heartbeat: DateTime<Utc>,
    /// Number of operations successfully synced
    pub operations_synced: u64,

    // Legacy fields (backwards compatible)
    /// Legacy: Current offset on replica (deprecated, use operations_synced)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub offset: Option<u64>,
    /// Legacy: Lag in operations (deprecated, use status)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub lag: Option<u64>,
}

/// Statistics for replication status
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicationStats {
    // New fields (v1.2.0+)
    /// Role of the node: Master or Replica
    #[serde(skip_serializing_if = "Option::is_none")]
    pub role: Option<String>,
    /// Total bytes sent to replicas (Master only)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub bytes_sent: Option<u64>,
    /// Total bytes received from master (Replica only)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub bytes_received: Option<u64>,
    /// Timestamp of last synchronization
    #[serde(skip_serializing_if = "Option::is_none")]
    pub last_sync: Option<DateTime<Utc>>,
    /// Number of operations pending replication
    #[serde(skip_serializing_if = "Option::is_none")]
    pub operations_pending: Option<usize>,
    /// Size of snapshot data in bytes
    #[serde(skip_serializing_if = "Option::is_none")]
    pub snapshot_size: Option<usize>,
    /// Number of connected replicas (Master only)
    #[serde(skip_serializing_if = "Option::is_none")]
    pub connected_replicas: Option<usize>,

    // Legacy fields (backwards compatible - always present)
    /// Current offset on master node
    pub master_offset: u64,
    /// Current offset on replica node
    pub replica_offset: u64,
    /// Number of operations behind
    pub lag_operations: u64,
    /// Total operations replicated
    pub total_replicated: u64,
}

/// Response for replication status endpoint
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicationStatusResponse {
    /// Overall status message
    pub status: String,
    /// Detailed replication statistics
    pub stats: ReplicationStats,
    /// Optional message with additional information
    #[serde(skip_serializing_if = "Option::is_none")]
    pub message: Option<String>,
}

/// Response for listing replicas
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicaListResponse {
    /// List of replica nodes
    pub replicas: Vec<ReplicaInfo>,
    /// Total count of replicas
    pub count: usize,
    /// Status message
    pub message: String,
}

// ===== VECTOR OPERATIONS — NEW METHODS (phase12) =====

/// Paginated vector listing returned by `GET /collections/{name}/vectors`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VectorPage {
    /// Vectors on this page — each entry carries `id`, `vector`, and `payload`.
    #[serde(default)]
    pub vectors: Vec<serde_json::Value>,
    /// Total vector count in the collection (unfiltered).
    #[serde(default)]
    pub total: usize,
    /// The effective `limit` applied by the server.
    #[serde(default)]
    pub limit: usize,
    /// The byte-offset applied by the server.
    ///
    /// Note: the task spec calls this `page` but the server handler
    /// (`GET /collections/{name}/vectors`) uses an `offset` query
    /// parameter internally and echoes it back as `offset`.
    #[serde(default)]
    pub offset: usize,
    /// Optional human-readable pagination hint from the server.
    #[serde(default)]
    pub message: Option<String>,
}

/// Request body for `update_vector` (`POST /update`).
///
/// Server reads `id` and `collection` from the top-level body.
/// All other keys are treated as payload updates.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UpdateVectorRequest {
    /// Vector id to update.
    pub id: String,
    /// New metadata / payload to merge (free-form JSON).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub metadata: Option<serde_json::Value>,
}

/// One item in a `batch_insert_texts` call (`POST /batch_insert`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchInsertItem {
    /// Optional client-supplied id.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub id: Option<String>,
    /// Text content to embed and insert.
    pub text: String,
    /// Optional metadata to attach.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub metadata: Option<serde_json::Value>,
}

/// Aggregate outcome of a `batch_insert_texts` or `insert_vectors` call.
/// Server response shape: `{collection, inserted, failed, count, results}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchInsertReport {
    /// Collection the vectors were inserted into.
    pub collection: String,
    /// Vectors successfully inserted.
    #[serde(alias = "inserted")]
    pub successful: usize,
    /// Vectors that failed.
    pub failed: usize,
    /// Total entries submitted.
    #[serde(default, alias = "count")]
    pub total: usize,
    /// Per-entry results.
    #[serde(default)]
    pub results: Vec<BatchResultEntry>,
}

/// One entry in a `batch_update_vectors` call (`POST /batch_update`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct VectorUpdate {
    /// Vector id to update.
    pub id: String,
    /// Optional new dense vector data.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub vector: Option<Vec<f32>>,
    /// Optional new payload.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub payload: Option<serde_json::Value>,
}

/// Aggregate outcome of a `batch_update_vectors` call.
/// Server response: `{collection, count, updated, failed, results}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchUpdateReport {
    /// Collection the update ran against.
    pub collection: String,
    /// Total entries submitted.
    #[serde(default, alias = "count")]
    pub total: usize,
    /// Successfully updated entries.
    #[serde(alias = "updated")]
    pub successful: usize,
    /// Failed entries.
    pub failed: usize,
    /// Per-entry results.
    #[serde(default)]
    pub results: Vec<serde_json::Value>,
}

/// One vector entry in an `insert_vectors` call (`POST /insert_vectors`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RawVectorInsert {
    /// Optional client-supplied id.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub id: Option<String>,
    /// Pre-computed embedding (length must match collection dimension).
    pub embedding: Vec<f32>,
    /// Optional payload (takes precedence over `metadata`).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub payload: Option<serde_json::Value>,
    /// Optional metadata (string–string map; used when `payload` absent).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub metadata: Option<HashMap<String, String>>,
}

/// One query in a `batch_search` call (`POST /batch_search`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BatchSearchQuery {
    /// Text query (embedded server-side) or raw vector (send via `vector`).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub query: Option<String>,
    /// Raw vector query (skips embedding).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub vector: Option<Vec<f32>>,
    /// Max results for this query.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub limit: Option<usize>,
    /// Score threshold.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub threshold: Option<f64>,
}

/// Request for `search_by_file` (`POST /collections/{name}/search/file`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SearchByFileRequest {
    /// File path to search within.
    pub file_path: String,
    /// Max results.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub limit: Option<usize>,
}

// ===== DISCOVERY PIPELINE TYPES (phase12) =====

/// Request for `broad_discovery` (`POST /discovery/broad_discovery`).
///
/// Server reads `queries` (array of strings) and optional `k`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BroadDiscoveryRequest {
    /// Expanded query strings to search across all collections.
    pub queries: Vec<String>,
    /// Number of top chunks to retrieve per query (default 50).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub k: Option<usize>,
}

/// Response from `broad_discovery`.
/// Server: `{chunks: [{collection, score, content_preview}], count}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BroadDiscoveryResponse {
    /// Retrieved chunk summaries.
    #[serde(default)]
    pub chunks: Vec<serde_json::Value>,
    /// Total chunks returned.
    #[serde(default)]
    pub count: usize,
}

/// Request for `semantic_focus` (`POST /discovery/semantic_focus`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SemanticFocusRequest {
    /// Target collection name.
    pub collection: String,
    /// Queries to focus within the collection.
    pub queries: Vec<String>,
    /// Number of top results per query (default 15).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub k: Option<usize>,
}

/// Response from `semantic_focus`.
/// Server: `{chunks: [...], count}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SemanticFocusResponse {
    /// Retrieved chunk summaries.
    #[serde(default)]
    pub chunks: Vec<serde_json::Value>,
    /// Total chunks returned.
    #[serde(default)]
    pub count: usize,
}

/// Request for `promote_readme` (`POST /discovery/promote_readme`).
/// `chunks` is an array of `ScoredChunk`-compatible objects.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PromoteReadmeRequest {
    /// Chunks to evaluate for README promotion.
    pub chunks: Vec<serde_json::Value>,
}

/// Response from `promote_readme`.
/// Server: `{promoted_chunks: [...], count}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PromoteReadmeResponse {
    /// Chunks identified as README-quality.
    #[serde(default)]
    pub promoted_chunks: Vec<serde_json::Value>,
    /// Count of promoted chunks.
    #[serde(default)]
    pub count: usize,
}

/// Request for `compress_evidence` (`POST /discovery/compress_evidence`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressEvidenceRequest {
    /// Input chunks to compress into bullets.
    pub chunks: Vec<serde_json::Value>,
    /// Maximum number of bullets to emit (default 20).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub max_bullets: Option<usize>,
    /// Maximum bullets per source document (default 3).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub max_per_doc: Option<usize>,
}

/// Response from `compress_evidence`.
/// Server: `{bullets: [{text, source_id, category, score}], count}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CompressEvidenceResponse {
    /// Compressed bullet points.
    #[serde(default)]
    pub bullets: Vec<serde_json::Value>,
    /// Count of bullets.
    #[serde(default)]
    pub count: usize,
}

/// Request for `build_answer_plan` (`POST /discovery/build_answer_plan`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnswerPlanRequest {
    /// Bullets to organize into a plan.
    pub bullets: Vec<serde_json::Value>,
}

/// Response from `build_answer_plan`.
/// Server: `{sections: [...], total_bullets, sources}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AnswerPlan {
    /// Organized sections.
    #[serde(default)]
    pub sections: Vec<serde_json::Value>,
    /// Total bullet count across all sections.
    #[serde(default)]
    pub total_bullets: usize,
    /// Source collection names referenced.
    #[serde(default)]
    pub sources: Vec<String>,
}

/// Request for `render_llm_prompt` (`POST /discovery/render_llm_prompt`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RenderPromptRequest {
    /// The answer plan to render.
    pub plan: AnswerPlan,
}

/// Response from `render_llm_prompt`.
/// Server: `{prompt, length, estimated_tokens}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LlmPrompt {
    /// The rendered prompt string.
    pub prompt: String,
    /// Byte length of the prompt.
    #[serde(default)]
    pub length: usize,
    /// Rough token estimate (length / 4).
    #[serde(default)]
    pub estimated_tokens: usize,
}

// ===== ADMIN / OBSERVABILITY TYPES (phase12) =====

/// Server statistics returned by `GET /stats`.
///
/// Server: `{collections, total_vectors, uptime_seconds, version,
/// default_quantization, compression_ratio}`. The last two are
/// phase25 §5 additions and default to `("none", 1.0)` on older
/// servers that do not emit them.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Stats {
    /// Number of collections.
    #[serde(default)]
    pub collections: usize,
    /// Total vectors across all collections.
    #[serde(default)]
    pub total_vectors: usize,
    /// Server uptime in seconds.
    #[serde(default)]
    pub uptime_seconds: u64,
    /// Server version string.
    #[serde(default)]
    pub version: String,
    /// Most-common quantization label across active collections
    /// (`none`, `binary`, `sq-4bit`, `sq-8bit`, `sq-16bit`, `sq`, or
    /// `pq`). `none` when the store is empty or the server is older
    /// than phase25 §5.
    #[serde(default = "default_quantization_label")]
    pub default_quantization: String,
    /// Mean compression ratio (uncompressed_bytes / compressed_bytes)
    /// across the collections sharing `default_quantization`. `1.0`
    /// when no collections are present or on older servers.
    #[serde(default = "default_compression_ratio")]
    pub compression_ratio: f32,
}

fn default_quantization_label() -> String {
    "none".to_string()
}

fn default_compression_ratio() -> f32 {
    1.0
}

/// Runtime metrics snapshot returned by `GET /metrics/runtime`
/// (phase25). Single JSON object refreshed once per second on the
/// server. Every field defaults so the SDK tolerates older servers
/// that do not emit the route.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct RuntimeMetrics {
    /// CPU usage of the server process, 0–100 %.
    #[serde(default)]
    pub cpu_percent: f64,
    /// Resident-set size of the server process in bytes.
    #[serde(default)]
    pub memory_rss_bytes: u64,
    /// Total physical memory of the host in bytes.
    #[serde(default)]
    pub memory_total_bytes: u64,
    /// RSS as a fraction of total memory, 0–100 %.
    #[serde(default)]
    pub memory_percent: f64,
    /// Active HTTP connections at the moment of sampling.
    #[serde(default)]
    pub active_connections: usize,
    /// Seconds since the server process started.
    #[serde(default)]
    pub uptime_seconds: u64,
    /// Rolling 60-second queries-per-second across all routes.
    #[serde(default)]
    pub qps_window_60s: f64,
    /// Fraction of requests in the last 60 s with HTTP 5xx status,
    /// 0–1.
    #[serde(default)]
    pub error_rate_5xx_60s: f64,
    /// Per-route latency / throughput. Sorted descending by QPS.
    #[serde(default)]
    pub throughput_by_route: Vec<RouteStats>,
    /// WAL state. Zero-initialised on standalone servers without
    /// replication.
    #[serde(default)]
    pub wal: WalSnapshot,
}

/// Per-route latency + QPS line in `RuntimeMetrics.throughput_by_route`.
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct RouteStats {
    /// Route path (raw URI; templated routes are normalised by the server).
    #[serde(default)]
    pub route: String,
    /// Queries per second for this route over the last 60 s.
    #[serde(default)]
    pub qps: f64,
    /// 50th-percentile latency in milliseconds.
    #[serde(default)]
    pub p50_ms: f64,
    /// 99th-percentile latency in milliseconds.
    #[serde(default)]
    pub p99_ms: f64,
}

/// WAL state surfaced inside `RuntimeMetrics.wal` (phase25 §3).
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct WalSnapshot {
    /// Latest offset appended to the WAL.
    #[serde(default)]
    pub current_seq: u64,
    /// On-disk WAL file size in bytes (0 in memory-only mode).
    #[serde(default)]
    pub size_bytes: u64,
    /// Unix timestamp (seconds) at which `last_checkpoint_seq` last
    /// advanced. 0 when no replica has confirmed an offset.
    #[serde(default)]
    pub last_checkpoint_at: u64,
    /// Lowest offset that has been confirmed by all replicas.
    #[serde(default)]
    pub last_checkpoint_seq: u64,
}

/// Server status returned by `GET /status`.
/// Server: `{online, version, uptime_seconds, collections_count}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ServerStatus {
    /// Whether the server is online.
    #[serde(default)]
    pub online: bool,
    /// Version string.
    #[serde(default)]
    pub version: String,
    /// Uptime in seconds.
    #[serde(default)]
    pub uptime_seconds: u64,
    /// Number of collections.
    #[serde(default)]
    pub collections_count: usize,
}

/// Query parameters for `get_logs` (`GET /logs`).
#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct LogsQuery {
    /// Number of log lines to return (default 100).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub lines: Option<usize>,
    /// Optional level filter (`INFO`, `WARN`, `ERROR`, `DEBUG`).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub level: Option<String>,
}

/// One log entry returned by `GET /logs`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LogEntry {
    /// ISO-8601 timestamp.
    #[serde(default)]
    pub timestamp: String,
    /// Log level.
    #[serde(default)]
    pub level: String,
    /// Log message.
    #[serde(default)]
    pub message: String,
    /// Source component.
    #[serde(default)]
    pub source: String,
}

/// Report returned by `cleanup_empty_collections` (`DELETE /collections/cleanup`).
///
/// The server shape is inferred; the handler returns a free-form JSON
/// `Value` so we use `serde_json::Value` fields with defaults.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CleanupReport {
    /// Whether the cleanup succeeded.
    #[serde(default)]
    pub success: bool,
    /// Number of collections removed.
    #[serde(default)]
    pub removed: usize,
    /// Names of the removed collections.
    #[serde(default)]
    pub collections: Vec<String>,
    /// Any message from the server.
    #[serde(default)]
    pub message: Option<String>,
}

/// Server configuration snapshot returned by `GET /config` and `POST /config`.
///
/// The config is a free-form YAML object loaded from `config.yml`; the
/// SDK surfaces it as `serde_json::Value` to avoid coupling to the
/// server's internal `Config` struct. Wrap in a newtype for ergonomics.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConfigSnapshot(pub serde_json::Value);

/// Patch applied to the server configuration by `POST /config`.
/// The server accepts the full config as a JSON object and writes it to
/// `config.yml`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ConfigPatch(pub serde_json::Value);

/// Metadata for one server-side backup file returned by `GET /backups`.
/// Server shape: `{id, name, date, size, collections}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BackupInfo {
    /// UUID of the backup.
    pub id: String,
    /// Human-readable name.
    pub name: String,
    /// Creation timestamp (RFC3339).
    pub date: String,
    /// File size in bytes (estimate).
    #[serde(default)]
    pub size: u64,
    /// Collection names included in the backup.
    #[serde(default)]
    pub collections: Vec<String>,
}

/// Request body for `create_backup` (`POST /backups/create`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateBackupRequest {
    /// Backup name.
    pub name: String,
    /// Collection names to include (empty = all).
    #[serde(default)]
    pub collections: Vec<String>,
}

/// Request body for `restore_backup` (`POST /backups/restore`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RestoreBackupRequest {
    /// ID of the backup to restore.
    pub backup_id: String,
}

/// Workspace config entry returned by `GET /workspace/config` and
/// `GET /workspace/list`.
///
/// The config is a free-form YAML object; surfaced as `serde_json::Value`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkspaceConfig(pub serde_json::Value);

/// Request body for `add_workspace` (`POST /workspace/add`).
/// Server reads `path` and `collection_name`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AddWorkspaceRequest {
    /// File-system path to watch.
    pub path: String,
    /// Collection name to index files into.
    pub collection_name: String,
}

// ===== AUTH TYPES (phase12) =====

/// User record returned by auth endpoints.
/// Server shape: `{user_id, username, roles}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct User {
    /// Opaque user identifier.
    pub user_id: String,
    /// Username string.
    pub username: String,
    /// Role names.
    #[serde(default)]
    pub roles: Vec<String>,
}

/// JWT token returned by `POST /auth/refresh`.
/// Server shape: `{access_token, token_type, expires_in}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JwtToken {
    /// Bearer access token.
    pub access_token: String,
    /// Token type (always `"Bearer"`).
    pub token_type: String,
    /// Lifetime in seconds.
    pub expires_in: u64,
}

/// Password policy report returned by `POST /auth/validate-password`.
/// Server shape: `{valid, errors, strength, strength_label}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PasswordPolicyReport {
    /// Whether the password satisfies all policy rules.
    pub valid: bool,
    /// Validation errors (empty when valid).
    #[serde(default)]
    pub errors: Vec<String>,
    /// Strength score 0–100.
    #[serde(default)]
    pub strength: u8,
    /// Human-readable strength label.
    #[serde(default)]
    pub strength_label: String,
}

/// Request body for `create_api_key` (`POST /auth/keys`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateApiKeyRequest {
    /// Key name / description.
    pub name: String,
    /// Permissions (optional; defaults to Read).
    #[serde(default)]
    pub permissions: Vec<String>,
    /// TTL in seconds from now (None = never expires).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub expires_in: Option<u64>,
}

/// API key returned by `POST /auth/keys`.
///
/// The actual key string is only returned once at creation time.
/// `GET /auth/keys` returns entries with `api_key` omitted.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ApiKey {
    /// Key UUID.
    pub id: String,
    /// Key name.
    pub name: String,
    /// Permissions.
    #[serde(default)]
    pub permissions: Vec<String>,
    /// The raw API key value (only present at creation time).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub api_key: Option<String>,
    /// Creation timestamp (Unix epoch seconds).
    #[serde(default)]
    pub created_at: u64,
    /// Last-used timestamp.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub last_used: Option<u64>,
    /// Expiry timestamp (None = never expires).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub expires_at: Option<u64>,
    /// Whether the key is currently active.
    #[serde(default)]
    pub active: bool,
    /// One-time warning message (present at creation).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub warning: Option<String>,
    /// Total successful credential validations recorded against this
    /// key. Defaults to 0 for keys that have never been used (or for
    /// servers that don't yet emit the field).
    #[serde(default)]
    pub usage_count: u64,
}

/// Per-collection scope attached to an API key.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct ApiKeyScope {
    /// Collection this scope applies to.
    pub collection: String,
    /// Permissions granted on that collection.
    #[serde(default)]
    pub permissions: Vec<String>,
}

/// Request body for `PUT /auth/keys/{id}/permissions`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UpdateApiKeyPermissionsRequest {
    /// New permission list. Server rejects an empty list with 400.
    pub permissions: Vec<String>,
    /// `None` leaves existing scopes untouched. `Some(vec![])` clears
    /// scopes (default-deny on scope-aware routes).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub scopes: Option<Vec<ApiKeyScope>>,
}

/// Flattened key view returned by `update_api_key_permissions` and
/// `get_api_key_usage`. Mirrors the server's `ApiKeyView`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ApiKeyView {
    pub id: String,
    pub name: String,
    pub user_id: String,
    #[serde(default)]
    pub permissions: Vec<String>,
    #[serde(default)]
    pub scopes: Vec<ApiKeyScope>,
    pub created_at: u64,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub last_used: Option<u64>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub expires_at: Option<u64>,
    #[serde(default)]
    pub active: bool,
    #[serde(default)]
    pub usage_count: u64,
}

/// One day's usage bucket from `GET /auth/keys/{id}/usage`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct ApiKeyUsageBucket {
    /// ISO-8601 date (UTC), e.g. `"2026-05-03"`.
    pub date: String,
    /// Successful validations recorded for that day.
    pub count: u64,
}

/// Response body for `GET /auth/keys/{id}/usage`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ApiKeyUsageReport {
    /// Live key view with up-to-date `usage_count`.
    pub key: ApiKeyView,
    /// Daily counter buckets, oldest first. Days with zero validations
    /// are still present so the caller can render a continuous
    /// sparkline without gap-fill logic.
    pub buckets: Vec<ApiKeyUsageBucket>,
    /// Sum of `buckets[*].count`.
    pub window_total: u64,
}

/// Request body for `create_user` (`POST /auth/users`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateUserRequest {
    /// Username.
    pub username: String,
    /// Initial password.
    pub password: String,
    /// Roles to assign (optional; defaults to `["User"]`).
    #[serde(default)]
    pub roles: Vec<String>,
}

// ===== REPLICATION SDK TYPES (phase12) =====

/// Replication status returned by `GET /replication/status`.
/// Server: `{role, enabled, stats?, replicas?}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicationStatus {
    /// Node role (`"Master"`, `"Replica"`, or `"Standalone"`).
    pub role: String,
    /// Whether replication is enabled on this node.
    pub enabled: bool,
    /// Replication stats (master or replica depending on role).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub stats: Option<ReplicationStats>,
    /// Connected replicas (master only).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub replicas: Option<Vec<ReplicaInfo>>,
}

/// Request body for `configure_replication` (`POST /replication/configure`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReplicationConfig {
    /// Target role: `"master"`, `"replica"`, or `"standalone"`.
    pub role: String,
    /// Bind address for master nodes.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub bind_address: Option<String>,
    /// Master address for replica nodes.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub master_address: Option<String>,
    /// Heartbeat interval in milliseconds.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub heartbeat_interval: Option<u64>,
    /// Replication log size.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub log_size: Option<usize>,
}

// ===== HUB TYPES (phase12) =====

/// A user-scoped backup entry returned by `GET /hub/backups`.
/// Mirrors `vectorizer::hub::backup::UserBackupInfo`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UserBackup {
    /// Backup UUID.
    pub id: String,
    /// User UUID (owner).
    pub user_id: String,
    /// Human-readable backup name.
    pub name: String,
    /// Optional description.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    /// Collections included.
    #[serde(default)]
    pub collections: Vec<String>,
    /// Creation timestamp (RFC3339).
    pub created_at: String,
    /// Backup size in bytes.
    #[serde(default)]
    pub size: u64,
    /// Status string (`"active"`, `"creating"`, etc.).
    #[serde(default)]
    pub status: String,
}

/// Request for `create_user_backup` (`POST /hub/backups`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateUserBackupRequest {
    /// User UUID who owns the backup.
    pub user_id: String,
    /// Backup name.
    pub name: String,
    /// Optional description.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
    /// Collections to include (None = all user collections).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub collections: Option<Vec<String>>,
}

/// Request for `restore_user_backup` (`POST /hub/backups/restore`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RestoreUserBackupRequest {
    /// User UUID.
    pub user_id: String,
    /// Backup UUID to restore.
    pub backup_id: String,
    /// Whether to overwrite existing collections.
    #[serde(default)]
    pub overwrite: bool,
}

/// Request for `upload_user_backup` (`POST /hub/backups/upload`).
///
/// The server actually accepts raw bytes via query params; the SDK
/// wraps the upload parameters here. The actual byte payload is passed
/// separately by the method.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UploadUserBackupRequest {
    /// User UUID.
    pub user_id: String,
    /// Optional backup name override.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub name: Option<String>,
    /// Binary backup data.
    #[serde(skip)]
    pub data: Vec<u8>,
}

/// Usage statistics returned by `GET /hub/usage/statistics`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct UsageStatistics {
    /// Whether the call succeeded.
    #[serde(default)]
    pub success: bool,
    /// Human-readable message.
    #[serde(default)]
    pub message: String,
    /// The statistics payload (free-form per server).
    #[serde(default)]
    pub stats: Option<serde_json::Value>,
}

/// Quota information returned by `GET /hub/usage/quota`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct QuotaInfo {
    /// Whether the call succeeded.
    #[serde(default)]
    pub success: bool,
    /// Human-readable message.
    #[serde(default)]
    pub message: String,
    /// The quota payload (free-form per server).
    #[serde(default)]
    pub quota: Option<serde_json::Value>,
}

// ===== SCHEMA-EVOLUTION + OBSERVABILITY TYPES (phase14) =====

/// Parameters for `reindex_collection` (`POST /collections/{name}/reindex`).
///
/// All fields carry defaults matching the server handler: `m=16`,
/// `ef_construction=200`, `ef_search=100`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ReindexParams {
    /// HNSW `M` parameter (number of bi-directional links).
    pub m: u32,
    /// HNSW `ef_construction` (size of the dynamic candidate list during build).
    pub ef_construction: u32,
    /// HNSW `ef_search` (size of the dynamic candidate list at query time).
    pub ef_search: u32,
}

/// Job descriptor returned by `reindex_collection`
/// (`POST /collections/{name}/reindex`).
///
/// Server contract: `{job_id, collection, state, params, progress}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ReindexJob {
    /// Opaque job id generated by the server.
    pub job_id: String,
    /// Collection that was re-indexed.
    pub collection: String,
    /// Job state string (`"completed"` on success).
    pub state: String,
    /// HNSW parameters that were applied.
    pub params: serde_json::Value,
    /// Progress fraction in `[0.0, 1.0]`.
    pub progress: f64,
}

/// Native snapshot metadata returned by `create_native_snapshot` and
/// each entry in `list_native_snapshots`.
///
/// Server contract: `{id, collection, created_at, size_bytes}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct NativeSnapshotInfo {
    /// Opaque snapshot id (UUID string).
    pub id: String,
    /// Collection the snapshot was taken from.
    pub collection: String,
    /// Creation timestamp in RFC-3339 format.
    pub created_at: String,
    /// Compressed snapshot size in bytes.
    pub size_bytes: u64,
}

/// Request body for `explain_search`
/// (`POST /collections/{name}/explain`).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExplainRequest {
    /// Query vector (must match the collection's dimension).
    pub vector: Vec<f32>,
    /// Number of nearest neighbours to retrieve (default 10).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub k: Option<u64>,
}

/// Execution trace attached to an `ExplainResponse`.
///
/// Server contract: `{visited_nodes, ef_search, hnsw_search_ms,
/// payload_filter_evals, quantization_score_ms, total_ms}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct ExplainTrace {
    /// Number of HNSW graph nodes visited during the search.
    pub visited_nodes: usize,
    /// Effective `ef_search` value used.
    pub ef_search: usize,
    /// Wall-clock time spent inside HNSW traversal (milliseconds).
    pub hnsw_search_ms: f64,
    /// Number of payload-filter predicate evaluations.
    pub payload_filter_evals: usize,
    /// Wall-clock time spent on quantized distance scoring (milliseconds).
    pub quantization_score_ms: f64,
    /// Total wall-clock time for the explain call (milliseconds).
    pub total_ms: f64,
}

/// Response from `explain_search`
/// (`POST /collections/{name}/explain`).
///
/// Server contract: `{collection, k, results, trace}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExplainResponse {
    /// Collection the search ran against.
    pub collection: String,
    /// Number of neighbours requested.
    pub k: usize,
    /// Ranked search hits (same shape as regular search results).
    #[serde(default)]
    pub results: Vec<serde_json::Value>,
    /// Full execution trace.
    pub trace: ExplainTrace,
}

/// One entry in the slow-query ring buffer returned by `GET /slow_queries`.
///
/// Server contract: `{timestamp, collection, k, duration_ms}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct SlowQueryEntry {
    /// ISO-8601 / RFC-3339 timestamp when the slow query was recorded.
    pub timestamp: String,
    /// Collection the query ran against.
    pub collection: String,
    /// Number of neighbours requested (`k`).
    pub k: usize,
    /// Observed query duration in milliseconds.
    pub duration_ms: f64,
}

/// Slow-query ring-buffer configuration returned by
/// `POST /slow_queries/config`.
///
/// Server contract: `{threshold_ms, capacity, status}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct SlowQueryConfig {
    /// Minimum duration (ms) for a query to be recorded.
    pub threshold_ms: u64,
    /// Maximum number of entries retained in the ring buffer.
    pub capacity: usize,
}

/// Validation result returned by `POST /hub/validate-key`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct HubApiKeyValidation {
    /// Whether the key is valid.
    pub valid: bool,
    /// Tenant id the key belongs to.
    #[serde(default)]
    pub tenant_id: String,
    /// Tenant name.
    #[serde(default)]
    pub tenant_name: String,
    /// Permissions granted by the key.
    #[serde(default)]
    pub permissions: Vec<String>,
    /// Validation timestamp (RFC3339).
    #[serde(default)]
    pub validated_at: String,
}

// ===== CLUSTER + AUTH ADMIN TYPES (phase15) =====

/// Report returned by `POST /cluster/failover`.
///
/// Server contract: `{promoted_replica_id, master_offset_at_promotion,
/// replica_offset_at_promotion, residual_lag_operations}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct FailoverReport {
    /// ID of the replica that was promoted to primary.
    pub promoted_replica_id: String,
    /// Master WAL offset at the time of promotion.
    pub master_offset_at_promotion: u64,
    /// Replica's confirmed offset at the time of promotion.
    pub replica_offset_at_promotion: u64,
    /// Remaining lag in WAL operations.
    pub residual_lag_operations: u64,
}

/// Report returned by `POST /cluster/replicas/{id}/resync`.
///
/// Server contract: `{replica_id, snapshot_offset, full_snapshot}`.
#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
pub struct ResyncJob {
    /// ID of the replica being resynced.
    pub replica_id: String,
    /// Master WAL offset used as the snapshot baseline.
    pub snapshot_offset: u64,
    /// Whether a full snapshot transfer was initiated.
    pub full_snapshot: bool,
}

/// Information about a newly added cluster peer.
///
/// Returned by `POST /cluster/peers`.
/// Server contract: `{node_id, address, role}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct PeerInfo {
    /// Opaque node id assigned by the server.
    pub node_id: String,
    /// Address of the peer (host:port).
    pub address: String,
    /// Role string: `"member"` or `"observer"`.
    pub role: String,
}

/// Request body for `POST /cluster/peers`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AddPeerRequest {
    /// Address of the new peer (host:port).
    pub address: String,
    /// Role: `"member"` (default) or `"observer"`.
    #[serde(default)]
    pub role: String,
}

/// Job descriptor returned by `POST /cluster/rebalance`.
///
/// Server contract: `{job_id, status, shards_to_move, shards_moved,
/// last_checkpoint_node, message}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RebalanceJob {
    /// Opaque job id.
    pub job_id: String,
    /// Lifecycle state: `"running"`, `"paused"`, `"completed"`, `"failed"`.
    pub status: String,
    /// Total shards that need to move.
    pub shards_to_move: usize,
    /// Shards moved so far.
    pub shards_moved: usize,
    /// Node-id of the last checkpoint.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub last_checkpoint_node: Option<String>,
    /// Human-readable status message.
    pub message: String,
}

/// Response from `POST /auth/keys/{id}/rotate`.
///
/// Server contract: `{old_key_id, new_key_id, new_token, grace_until}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct RotatedKey {
    /// The old key id (still valid until `grace_until`).
    pub old_key_id: String,
    /// The new key id.
    pub new_key_id: String,
    /// The new key token value — store it securely.
    pub new_token: String,
    /// Unix timestamp until which the OLD key is still accepted.
    pub grace_until: u64,
}

/// Request body for `POST /auth/keys` — extended with optional per-collection scopes.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct CreateScopedApiKeyRequest {
    /// Key name / description.
    pub name: String,
    /// Global permissions (optional; defaults to `["Read"]`).
    #[serde(default)]
    pub permissions: Vec<String>,
    /// TTL in seconds from now (`None` = never expires).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub expires_in: Option<u64>,
    /// Per-collection scopes. Empty = default-deny on scope-enforced routes.
    #[serde(default)]
    pub scopes: Vec<TokenScope>,
}

/// Per-collection permission scope sent in [`CreateScopedApiKeyRequest`].
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TokenScope {
    /// Collection name this scope applies to.
    pub collection: String,
    /// Permissions granted on that collection (e.g. `["read", "write"]`).
    #[serde(default)]
    pub permissions: Vec<String>,
}

/// RFC 7662 token introspection response from `POST /auth/introspect`.
///
/// Server contract: `{active, scope?, sub?, exp?, username?}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TokenIntrospection {
    /// Whether the token is currently active.
    pub active: bool,
    /// Space-separated scope string.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub scope: Option<String>,
    /// Subject (user_id or key_id).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub sub: Option<String>,
    /// Expiry (Unix timestamp).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub exp: Option<u64>,
    /// Username (non-standard extension; omitted for inactive tokens).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub username: Option<String>,
}

/// One entry in the admin audit log returned by `GET /auth/audit`.
///
/// Server contract: `{actor, action, target, at, correlation_id}`.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct AuditEntry {
    /// Username or key-id of the actor.
    pub actor: String,
    /// Canonical action name, e.g. `"create_api_key"`.
    pub action: String,
    /// Target resource.
    pub target: String,
    /// UTC timestamp (RFC-3339).
    pub at: String,
    /// Correlation-ID propagated from the request middleware.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub correlation_id: Option<String>,
}

/// Query parameters for `GET /auth/audit`.
#[derive(Debug, Clone, Default, Serialize)]
pub struct AuditQuery {
    /// Filter by actor.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub actor: Option<String>,
    /// Filter by action name.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub action: Option<String>,
    /// Entries at or after this RFC-3339 timestamp.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub since: Option<String>,
    /// Entries at or before this RFC-3339 timestamp.
    #[serde(skip_serializing_if = "Option::is_none")]
    pub until: Option<String>,
    /// Maximum entries to return (server default 200).
    #[serde(skip_serializing_if = "Option::is_none")]
    pub limit: Option<usize>,
}