linear-motion 0.2.0

use crate::Result;
use fjall::{Keyspace, PartitionHandle, PersistMode};
use serde::{Deserialize, Serialize};
use std::path::Path;
use tracing::{debug, info};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum MappingStatus {
    Pending, // Linear issue fetched, Motion task creation pending
    Synced,  // Motion task created successfully
    Failed,  // Motion task creation failed
    Stale,   // Linear issue may have been updated, needs re-sync
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct TaskMapping {
    pub linear_issue_id: String,
    pub motion_task_id: Option<String>, // None if Motion task not yet created
    pub sync_source: String,
    pub status: MappingStatus,
    pub linear_issue_data: serde_json::Value, // Store the full Linear issue data
    pub created_at: chrono::DateTime<chrono::Utc>,
    pub updated_at: chrono::DateTime<chrono::Utc>,
    pub last_sync_attempt: Option<chrono::DateTime<chrono::Utc>>,
    pub sync_error: Option<String>,
}

pub struct MappingStore {
    keyspace: Keyspace,
    mappings: PartitionHandle,
}

impl MappingStore {
    pub async fn new<P: AsRef<Path>>(db_path: P) -> Result<Self> {
        let keyspace = fjall::Config::new(db_path).open()?;
        let mappings =
            keyspace.open_partition("task_mappings", fjall::PartitionCreateOptions::default())?;

        debug!("task mapping store initialized");

        Ok(Self { keyspace, mappings })
    }

    pub async fn store_mapping(&self, mapping: TaskMapping) -> Result<()> {
        let key = format!("{}:{}", mapping.sync_source, mapping.linear_issue_id);
        let value = serde_json::to_vec(&mapping)?;

        self.mappings.insert(&key, &value)?;
        debug!(
            "Stored mapping: {} -> {:?} (status: {:?})",
            mapping.linear_issue_id, mapping.motion_task_id, mapping.status
        );

        Ok(())
    }

    pub async fn get_mapping_by_linear_id(
        &self,
        sync_source: &str,
        linear_issue_id: &str,
    ) -> Result<Option<TaskMapping>> {
        let key = format!("{}:{}", sync_source, linear_issue_id);

        match self.mappings.get(&key)? {
            Some(value) => {
                let mapping: TaskMapping = serde_json::from_slice(&value)?;
                debug!(
                    "Found mapping: {} -> {:?}",
                    linear_issue_id, mapping.motion_task_id
                );
                Ok(Some(mapping))
            }
            None => {
                debug!("No mapping found for Linear issue: {}", linear_issue_id);
                Ok(None)
            }
        }
    }

    pub async fn get_mapping_by_motion_id(
        &self,
        motion_task_id: &str,
    ) -> Result<Option<TaskMapping>> {
        // Since we need to search by Motion task ID, we'll iterate through all mappings
        // For better performance in a production system, we might want to maintain a reverse index
        for item in self.mappings.iter() {
            let (_, value) = item?;
            let mapping: TaskMapping = serde_json::from_slice(&value)?;

            if mapping.motion_task_id.as_deref() == Some(motion_task_id) {
                debug!(
                    "Found mapping by Motion ID: {} -> {}",
                    motion_task_id, mapping.linear_issue_id
                );
                return Ok(Some(mapping));
            }
        }

        debug!("No mapping found for Motion task: {}", motion_task_id);
        Ok(None)
    }

    pub async fn remove_mapping(
        &self,
        sync_source: &str,
        linear_issue_id: &str,
    ) -> Result<Option<TaskMapping>> {
        let key = format!("{}:{}", sync_source, linear_issue_id);

        let existing = match self.mappings.get(&key)? {
            Some(value) => Some(serde_json::from_slice(&value)?),
            None => None,
        };

        if existing.is_some() {
            self.mappings.remove(&key)?;
            debug!("Removed mapping for Linear issue: {}", linear_issue_id);
        }

        Ok(existing)
    }

    pub async fn list_mappings_by_source(&self, sync_source: &str) -> Result<Vec<TaskMapping>> {
        let prefix = format!("{}:", sync_source);
        let mut mappings = Vec::new();

        for item in self.mappings.iter() {
            let (key, value) = item?;
            let key_str = String::from_utf8_lossy(&key);

            if key_str.starts_with(&prefix) {
                let mapping: TaskMapping = serde_json::from_slice(&value)?;
                mappings.push(mapping);
            }
        }

        debug!(
            "Found {} mappings for sync source: {}",
            mappings.len(),
            sync_source
        );
        Ok(mappings)
    }

    pub async fn list_all_mappings(&self) -> Result<Vec<TaskMapping>> {
        let mut mappings = Vec::new();

        for item in self.mappings.iter() {
            let (_, value) = item?;
            let mapping: TaskMapping = serde_json::from_slice(&value)?;
            mappings.push(mapping);
        }

        debug!("Found {} total mappings", mappings.len());
        Ok(mappings)
    }

    pub async fn update_mapping(&self, mapping: TaskMapping) -> Result<()> {
        let updated_mapping = TaskMapping {
            updated_at: chrono::Utc::now(),
            ..mapping
        };

        self.store_mapping(updated_mapping).await
    }

    /// Create a pending mapping from a Linear issue
    pub async fn create_pending_mapping(
        &self,
        sync_source: &str,
        issue: &crate::clients::linear::LinearIssue,
    ) -> Result<TaskMapping> {
        let mapping = TaskMapping {
            linear_issue_id: issue.id.clone(),
            motion_task_id: None,
            sync_source: sync_source.to_string(),
            status: MappingStatus::Pending,
            linear_issue_data: serde_json::to_value(issue)?,
            created_at: chrono::Utc::now(),
            updated_at: chrono::Utc::now(),
            last_sync_attempt: None,
            sync_error: None,
        };

        self.store_mapping(mapping.clone()).await?;
        debug!("Created pending mapping for Linear issue: {}", issue.id);
        Ok(mapping)
    }

    /// Update mapping with Motion task ID when sync succeeds
    pub async fn mark_synced(
        &self,
        sync_source: &str,
        linear_issue_id: &str,
        motion_task_id: String,
    ) -> Result<()> {
        if let Some(mut mapping) = self
            .get_mapping_by_linear_id(sync_source, linear_issue_id)
            .await?
        {
            mapping.motion_task_id = Some(motion_task_id);
            mapping.status = MappingStatus::Synced;
            mapping.updated_at = chrono::Utc::now();
            mapping.sync_error = None;

            self.store_mapping(mapping).await?;
            debug!("Marked mapping as synced: {}", linear_issue_id);
        }
        Ok(())
    }

    /// Update mapping when sync fails
    pub async fn mark_failed(
        &self,
        sync_source: &str,
        linear_issue_id: &str,
        error: String,
    ) -> Result<()> {
        if let Some(mut mapping) = self
            .get_mapping_by_linear_id(sync_source, linear_issue_id)
            .await?
        {
            mapping.status = MappingStatus::Failed;
            mapping.updated_at = chrono::Utc::now();
            mapping.last_sync_attempt = Some(chrono::Utc::now());
            mapping.sync_error = Some(error);

            self.store_mapping(mapping).await?;
            debug!("Marked mapping as failed: {}", linear_issue_id);
        }
        Ok(())
    }

    /// Update the stored Linear issue data in a mapping (used for re-sync)
    pub async fn update_issue_data(
        &self,
        sync_source: &str,
        linear_issue_id: &str,
        issue: &crate::clients::linear::LinearIssue,
    ) -> Result<()> {
        if let Some(mut mapping) = self
            .get_mapping_by_linear_id(sync_source, linear_issue_id)
            .await?
        {
            mapping.linear_issue_data = serde_json::to_value(issue)?;
            mapping.updated_at = chrono::Utc::now();

            self.store_mapping(mapping).await?;
            debug!("Updated issue data for mapping: {}", linear_issue_id);
        }
        Ok(())
    }

    /// Get mappings by status
    pub async fn list_mappings_by_status(&self, status: MappingStatus) -> Result<Vec<TaskMapping>> {
        let mut mappings = Vec::new();

        for item in self.mappings.iter() {
            let (_, value) = item?;
            let mapping: TaskMapping = serde_json::from_slice(&value)?;

            if std::mem::discriminant(&mapping.status) == std::mem::discriminant(&status) {
                mappings.push(mapping);
            }
        }

        debug!(
            "Found {} mappings with status: {:?}",
            mappings.len(),
            status
        );
        Ok(mappings)
    }

    pub async fn flush(&self) -> Result<()> {
        self.keyspace.persist(PersistMode::SyncAll)?;
        Ok(())
    }
}

impl TaskMapping {
    pub fn new(linear_issue_id: String, motion_task_id: String, sync_source: String) -> Self {
        let now = chrono::Utc::now();

        Self {
            linear_issue_id,
            motion_task_id: Some(motion_task_id),
            sync_source,
            status: MappingStatus::Synced,
            linear_issue_data: serde_json::Value::Null, // Legacy constructor doesn't have issue data
            created_at: now,
            updated_at: now,
            last_sync_attempt: Some(now),
            sync_error: None,
        }
    }
}