//! Action management API routes

use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    response::IntoResponse,
    routing::get,
    Json, Router,
};
use std::sync::Arc;
use validator::Validate;

use attune_common::repositories::{
    action::{ActionRepository, CreateActionInput, UpdateActionInput},
    pack::PackRepository,
    queue_stats::QueueStatsRepository,
    Create, Delete, FindByRef, List, Update,
};

use crate::{
    auth::middleware::RequireAuth,
    dto::{
        action::{
            ActionResponse, ActionSummary, CreateActionRequest, QueueStatsResponse,
            UpdateActionRequest,
        },
        common::{PaginatedResponse, PaginationParams},
        ApiResponse, SuccessResponse,
    },
    middleware::{ApiError, ApiResult},
    state::AppState,
};

/// List all actions with pagination
#[utoipa::path(
    get,
    path = "/api/v1/actions",
    tag = "actions",
    params(PaginationParams),
    responses(
        (status = 200, description = "List of actions", body = PaginatedResponse<ActionSummary>),
    ),
    security(("bearer_auth" = []))
)]
pub async fn list_actions(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Query(pagination): Query<PaginationParams>,
) -> ApiResult<impl IntoResponse> {
    // Get all actions (we'll implement pagination in repository later)
    let actions = ActionRepository::list(&state.db).await?;

    // Calculate pagination
    let total = actions.len() as u64;
    let start = ((pagination.page - 1) * pagination.limit()) as usize;
    let end = (start + pagination.limit() as usize).min(actions.len());

    // Get paginated slice
    let paginated_actions: Vec<ActionSummary> = actions[start..end]
        .iter()
        .map(|a| ActionSummary::from(a.clone()))
        .collect();

    let response = PaginatedResponse::new(paginated_actions, &pagination, total);

    Ok((StatusCode::OK, Json(response)))
}

/// List actions by pack reference
#[utoipa::path(
    get,
    path = "/api/v1/packs/{pack_ref}/actions",
    tag = "actions",
    params(
        ("pack_ref" = String, Path, description = "Pack reference identifier"),
        PaginationParams
    ),
    responses(
        (status = 200, description = "List of actions for pack", body = PaginatedResponse<ActionSummary>),
        (status = 404, description = "Pack not found")
    ),
    security(("bearer_auth" = []))
)]
pub async fn list_actions_by_pack(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Path(pack_ref): Path<String>,
    Query(pagination): Query<PaginationParams>,
) -> ApiResult<impl IntoResponse> {
    // Verify pack exists
    let pack = PackRepository::find_by_ref(&state.db, &pack_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Pack '{}' not found", pack_ref)))?;

    // Get actions for this pack
    let actions = ActionRepository::find_by_pack(&state.db, pack.id).await?;

    // Calculate pagination
    let total = actions.len() as u64;
    let start = ((pagination.page - 1) * pagination.limit()) as usize;
    let end = (start + pagination.limit() as usize).min(actions.len());

    // Get paginated slice
    let paginated_actions: Vec<ActionSummary> = actions[start..end]
        .iter()
        .map(|a| ActionSummary::from(a.clone()))
        .collect();

    let response = PaginatedResponse::new(paginated_actions, &pagination, total);

    Ok((StatusCode::OK, Json(response)))
}

/// Get a single action by reference
#[utoipa::path(
    get,
    path = "/api/v1/actions/{ref}",
    tag = "actions",
    params(
        ("ref" = String, Path, description = "Action reference identifier")
    ),
    responses(
        (status = 200, description = "Action details", body = inline(ApiResponse<ActionResponse>)),
        (status = 404, description = "Action not found")
    ),
    security(("bearer_auth" = []))
)]
pub async fn get_action(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Path(action_ref): Path<String>,
) -> ApiResult<impl IntoResponse> {
    let action = ActionRepository::find_by_ref(&state.db, &action_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Action '{}' not found", action_ref)))?;

    let response = ApiResponse::new(ActionResponse::from(action));

    Ok((StatusCode::OK, Json(response)))
}

/// Create a new action
#[utoipa::path(
    post,
    path = "/api/v1/actions",
    tag = "actions",
    request_body = CreateActionRequest,
    responses(
        (status = 201, description = "Action created successfully", body = inline(ApiResponse<ActionResponse>)),
        (status = 400, description = "Validation error"),
        (status = 404, description = "Pack not found"),
        (status = 409, description = "Action with same ref already exists")
    ),
    security(("bearer_auth" = []))
)]
pub async fn create_action(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Json(request): Json<CreateActionRequest>,
) -> ApiResult<impl IntoResponse> {
    // Validate request
    request.validate()?;

    // Check if action with same ref already exists
    if let Some(_) = ActionRepository::find_by_ref(&state.db, &request.r#ref).await? {
        return Err(ApiError::Conflict(format!(
            "Action with ref '{}' already exists",
            request.r#ref
        )));
    }

    // Verify pack exists and get its ID
    let pack = PackRepository::find_by_ref(&state.db, &request.pack_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Pack '{}' not found", request.pack_ref)))?;

    // If runtime is specified, we could verify it exists (future enhancement)
    // For now, the database foreign key constraint will handle invalid runtime IDs

    // Create action input
    let action_input = CreateActionInput {
        r#ref: request.r#ref,
        pack: pack.id,
        pack_ref: pack.r#ref.clone(),
        label: request.label,
        description: request.description,
        entrypoint: request.entrypoint,
        runtime: request.runtime,
        runtime_version_constraint: request.runtime_version_constraint,
        param_schema: request.param_schema,
        out_schema: request.out_schema,
        is_adhoc: true, // Actions created via API are ad-hoc (not from pack installation)
    };

    let action = ActionRepository::create(&state.db, action_input).await?;

    let response =
        ApiResponse::with_message(ActionResponse::from(action), "Action created successfully");

    Ok((StatusCode::CREATED, Json(response)))
}

/// Update an existing action
#[utoipa::path(
    put,
    path = "/api/v1/actions/{ref}",
    tag = "actions",
    params(
        ("ref" = String, Path, description = "Action reference identifier")
    ),
    request_body = UpdateActionRequest,
    responses(
        (status = 200, description = "Action updated successfully", body = inline(ApiResponse<ActionResponse>)),
        (status = 400, description = "Validation error"),
        (status = 404, description = "Action not found")
    ),
    security(("bearer_auth" = []))
)]
pub async fn update_action(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Path(action_ref): Path<String>,
    Json(request): Json<UpdateActionRequest>,
) -> ApiResult<impl IntoResponse> {
    // Validate request
    request.validate()?;

    // Check if action exists
    let existing_action = ActionRepository::find_by_ref(&state.db, &action_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Action '{}' not found", action_ref)))?;

    // Create update input
    let update_input = UpdateActionInput {
        label: request.label,
        description: request.description,
        entrypoint: request.entrypoint,
        runtime: request.runtime,
        runtime_version_constraint: request.runtime_version_constraint,
        param_schema: request.param_schema,
        out_schema: request.out_schema,
    };

    let action = ActionRepository::update(&state.db, existing_action.id, update_input).await?;

    let response =
        ApiResponse::with_message(ActionResponse::from(action), "Action updated successfully");

    Ok((StatusCode::OK, Json(response)))
}

/// Delete an action
#[utoipa::path(
    delete,
    path = "/api/v1/actions/{ref}",
    tag = "actions",
    params(
        ("ref" = String, Path, description = "Action reference identifier")
    ),
    responses(
        (status = 200, description = "Action deleted successfully", body = SuccessResponse),
        (status = 404, description = "Action not found")
    ),
    security(("bearer_auth" = []))
)]
pub async fn delete_action(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Path(action_ref): Path<String>,
) -> ApiResult<impl IntoResponse> {
    // Check if action exists
    let action = ActionRepository::find_by_ref(&state.db, &action_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Action '{}' not found", action_ref)))?;

    // Delete the action
    let deleted = ActionRepository::delete(&state.db, action.id).await?;

    if !deleted {
        return Err(ApiError::NotFound(format!(
            "Action '{}' not found",
            action_ref
        )));
    }

    let response = SuccessResponse::new(format!("Action '{}' deleted successfully", action_ref));

    Ok((StatusCode::OK, Json(response)))
}

/// Get queue statistics for an action
#[utoipa::path(
    get,
    path = "/api/v1/actions/{ref}/queue-stats",
    tag = "actions",
    params(
        ("ref" = String, Path, description = "Action reference identifier")
    ),
    responses(
        (status = 200, description = "Queue statistics", body = inline(ApiResponse<QueueStatsResponse>)),
        (status = 404, description = "Action not found or no queue statistics available")
    ),
    security(("bearer_auth" = []))
)]
pub async fn get_queue_stats(
    State(state): State<Arc<AppState>>,
    RequireAuth(_user): RequireAuth,
    Path(action_ref): Path<String>,
) -> ApiResult<impl IntoResponse> {
    // Find the action by reference
    let action = ActionRepository::find_by_ref(&state.db, &action_ref)
        .await?
        .ok_or_else(|| ApiError::NotFound(format!("Action '{}' not found", action_ref)))?;

    // Get queue statistics from database
    let queue_stats = QueueStatsRepository::find_by_action(&state.db, action.id)
        .await?
        .ok_or_else(|| {
            ApiError::NotFound(format!(
                "No queue statistics available for action '{}'",
                action_ref
            ))
        })?;

    // Convert to response DTO and populate action_ref
    let mut response_stats = QueueStatsResponse::from(queue_stats);
    response_stats.action_ref = action.r#ref.clone();

    let response = ApiResponse::new(response_stats);

    Ok((StatusCode::OK, Json(response)))
}

/// Create action routes
pub fn routes() -> Router<Arc<AppState>> {
    Router::new()
        .route("/actions", get(list_actions).post(create_action))
        .route(
            "/actions/{ref}",
            get(get_action).put(update_action).delete(delete_action),
        )
        .route("/actions/{ref}/queue-stats", get(get_queue_stats))
        .route("/packs/{pack_ref}/actions", get(list_actions_by_pack))
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_action_routes_structure() {
        // Just verify the router can be constructed
        let _router = routes();
    }
}