reasonkit-web 0.1.7

//! # Data Export Module
//!
//! User data export functionality for GDPR compliance and data portability.
//!
//! ## Features
//!
//! - Multiple export formats (JSON, CSV, PDF)
//! - Scheduled/recurring exports
//! - Export job queue with status tracking
//! - Email notifications on completion

#![allow(unused_variables)] // Stub implementation

use axum::{
    extract::{Json, Path},
    http::StatusCode,
    response::IntoResponse,
};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use uuid::Uuid;

/// Export format options
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase")]
pub enum ExportFormat {
    /// JSON format (machine-readable)
    Json,
    /// CSV format (spreadsheet-compatible)
    Csv,
    /// PDF format (human-readable document)
    Pdf,
    /// ZIP archive containing multiple formats
    Zip,
}

/// Export job status
#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "lowercase")]
pub enum ExportStatus {
    /// Job is queued and waiting to be processed
    Pending,
    /// Job is currently being processed
    Processing,
    /// Job completed successfully, download available
    Completed,
    /// Job failed with an error
    Failed,
    /// Download link has expired
    Expired,
}

/// Data categories available for export
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ExportCategory {
    /// User profile and settings
    Profile,
    /// Reasoning history and traces
    ReasoningHistory,
    /// API usage and analytics
    ApiUsage,
    /// Subscription and billing history
    Billing,
    /// All data (GDPR full export)
    All,
}

/// Export job definition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExportJob {
    /// Unique export ID
    pub id: Uuid,
    /// User ID requesting export
    pub user_id: Uuid,
    /// Export format
    pub format: ExportFormat,
    /// Categories to export
    pub categories: Vec<ExportCategory>,
    /// Current status
    pub status: ExportStatus,
    /// Progress percentage (0-100)
    pub progress: u8,
    /// Download URL (when completed)
    pub download_url: Option<String>,
    /// File size in bytes (when completed)
    pub file_size: Option<u64>,
    /// Creation timestamp
    pub created_at: DateTime<Utc>,
    /// Completion timestamp
    pub completed_at: Option<DateTime<Utc>>,
    /// Expiration timestamp (for download link)
    pub expires_at: Option<DateTime<Utc>>,
    /// Error message (if failed)
    pub error: Option<String>,
}

/// Export configuration
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ExportConfig {
    /// Storage backend (s3, local)
    pub storage_backend: String,
    /// S3 bucket name
    pub s3_bucket: Option<String>,
    /// Local storage path
    pub local_path: Option<String>,
    /// Download link expiration (hours)
    pub link_expiry_hours: u32,
    /// Maximum export file size (MB)
    pub max_file_size_mb: u32,
    /// Enable compression
    pub compression_enabled: bool,
    /// Encryption key for exports
    pub encryption_key: Option<String>,
}

impl Default for ExportConfig {
    fn default() -> Self {
        Self {
            storage_backend: "local".to_string(),
            s3_bucket: None,
            local_path: Some("/var/lib/reasonkit/exports".to_string()),
            link_expiry_hours: 24,
            max_file_size_mb: 500,
            compression_enabled: true,
            encryption_key: None,
        }
    }
}

/// Scheduled export definition
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ScheduledExport {
    /// Schedule ID
    pub id: Uuid,
    /// User ID
    pub user_id: Uuid,
    /// Cron expression (e.g., "0 0 * * 0" for weekly)
    pub cron_expression: String,
    /// Export format
    pub format: ExportFormat,
    /// Categories to export
    pub categories: Vec<ExportCategory>,
    /// Send email notification
    pub notify_email: bool,
    /// Enabled status
    pub enabled: bool,
    /// Last execution time
    pub last_run: Option<DateTime<Utc>>,
    /// Next scheduled run
    pub next_run: Option<DateTime<Utc>>,
}

/// Export service for managing export jobs
#[allow(dead_code)] // Reserved for export configuration
pub struct ExportService {
    config: ExportConfig,
}

impl ExportService {
    pub fn new(config: ExportConfig) -> Self {
        Self { config }
    }

    /// Create a new export job
    pub async fn create_export(
        &self,
        user_id: Uuid,
        format: ExportFormat,
        categories: Vec<ExportCategory>,
    ) -> Result<ExportJob, ExportError> {
        let job = ExportJob {
            id: Uuid::new_v4(),
            user_id,
            format,
            categories,
            status: ExportStatus::Pending,
            progress: 0,
            download_url: None,
            file_size: None,
            created_at: Utc::now(),
            completed_at: None,
            expires_at: None,
            error: None,
        };

        // TODO: Queue job for processing
        Ok(job)
    }

    /// Get export job status
    pub async fn get_status(&self, job_id: Uuid) -> Result<ExportJob, ExportError> {
        // TODO: Query database
        Err(ExportError::NotFound)
    }

    /// Get export history for user
    pub async fn get_history(
        &self,
        user_id: Uuid,
        limit: usize,
    ) -> Result<Vec<ExportJob>, ExportError> {
        // TODO: Query database
        Ok(vec![])
    }

    /// Schedule recurring export
    pub async fn schedule_export(
        &self,
        user_id: Uuid,
        schedule: ScheduledExport,
    ) -> Result<ScheduledExport, ExportError> {
        // TODO: Store schedule and register with job scheduler
        Ok(schedule)
    }

    /// Process export job (worker function)
    pub async fn process_export(&self, job_id: Uuid) -> Result<(), ExportError> {
        // TODO: Implement export processing
        // 1. Gather data from all requested categories
        // 2. Transform to requested format
        // 3. Compress if enabled
        // 4. Upload to storage
        // 5. Update job status
        // 6. Send notification
        Ok(())
    }
}

impl Default for ExportService {
    fn default() -> Self {
        Self::new(ExportConfig::default())
    }
}

/// Export operation errors
#[derive(Debug, thiserror::Error)]
pub enum ExportError {
    /// Export job not found
    #[error("Export not found")]
    NotFound,
    /// Export download link has expired
    #[error("Export expired")]
    Expired,
    /// Export processing failed
    #[error("Export failed: {0}")]
    ProcessingError(String),
    /// Invalid cron schedule expression
    #[error("Invalid schedule: {0}")]
    InvalidSchedule(String),
    /// Storage backend error
    #[error("Storage error: {0}")]
    StorageError(String),
    /// Database operation failed
    #[error("Database error: {0}")]
    DatabaseError(String),
    /// Too many export requests
    #[error("Rate limit exceeded")]
    RateLimitExceeded,
}

/// HTTP handlers for export endpoints
pub mod handlers {
    use super::*;

    /// Request body for creating a new export job
    #[derive(Debug, Deserialize)]
    pub struct CreateExportRequest {
        /// Desired export format
        pub format: ExportFormat,
        /// Data categories to include
        pub categories: Vec<ExportCategory>,
    }

    /// Request body for scheduling recurring exports
    #[derive(Debug, Deserialize)]
    pub struct ScheduleExportRequest {
        /// Cron expression for schedule (e.g., "0 0 * * 0" for weekly)
        pub cron_expression: String,
        /// Desired export format
        pub format: ExportFormat,
        /// Data categories to include
        pub categories: Vec<ExportCategory>,
        /// Whether to send email notification on completion
        pub notify_email: bool,
    }

    /// Create a new export job
    pub async fn create_export(Json(req): Json<CreateExportRequest>) -> impl IntoResponse {
        let job = ExportJob {
            id: Uuid::new_v4(),
            user_id: Uuid::new_v4(), // TODO: from auth context
            format: req.format,
            categories: req.categories,
            status: ExportStatus::Pending,
            progress: 0,
            download_url: None,
            file_size: None,
            created_at: Utc::now(),
            completed_at: None,
            expires_at: None,
            error: None,
        };
        (StatusCode::ACCEPTED, Json(job))
    }

    /// Get export job status
    pub async fn get_export_status(Path(id): Path<Uuid>) -> impl IntoResponse {
        // TODO: Query database
        (
            StatusCode::OK,
            Json(serde_json::json!({
                "id": id,
                "status": "pending",
                "progress": 0
            })),
        )
    }

    /// Download completed export
    pub async fn download_export(Path(id): Path<Uuid>) -> impl IntoResponse {
        // TODO: Stream file from storage
        StatusCode::NOT_IMPLEMENTED
    }

    /// Schedule recurring export
    pub async fn schedule_export(Json(req): Json<ScheduleExportRequest>) -> impl IntoResponse {
        let schedule = ScheduledExport {
            id: Uuid::new_v4(),
            user_id: Uuid::new_v4(), // TODO: from auth context
            cron_expression: req.cron_expression,
            format: req.format,
            categories: req.categories,
            notify_email: req.notify_email,
            enabled: true,
            last_run: None,
            next_run: None,
        };
        (StatusCode::CREATED, Json(schedule))
    }

    /// Get export history
    pub async fn export_history() -> impl IntoResponse {
        (StatusCode::OK, Json(serde_json::json!({"exports": []})))
    }
}