//! Metrics API endpoints

use axum::{
    extract::{Path, Query, State},
    http::StatusCode,
    Json,
};
use chrono::{DateTime, Utc};
use serde::Deserialize;
use uuid::Uuid;

use crate::auth::AuthUser;
use crate::db::{self, Metrics, MetricsSummary};
use crate::AppState;

/// Query parameters for metrics
#[derive(Debug, Deserialize)]
pub struct MetricsQuery {
    /// Number of records to return (default: 100)
    pub limit: Option<i64>,

    /// Start time for range query
    pub start: Option<DateTime<Utc>>,

    /// End time for range query
    pub end: Option<DateTime<Utc>>,
}

/// Get metrics for a specific agent
/// Requires authentication.
pub async fn get_agent_metrics(
    State(state): State<AppState>,
    _user: AuthUser,
    Path(id): Path<Uuid>,
    Query(query): Query<MetricsQuery>,
) -> Result<Json<Vec<Metrics>>, (StatusCode, String)> {
    // First verify the agent exists
    let _agent = db::get_agent_by_id(&state.db, id)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?
        .ok_or((StatusCode::NOT_FOUND, "Agent not found".to_string()))?;

    let metrics = if let (Some(start), Some(end)) = (query.start, query.end) {
        // Range query
        db::get_agent_metrics_range(&state.db, id, start, end)
            .await
            .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?
    } else {
        // Simple limit query
        let limit = query.limit.unwrap_or(100).min(1000); // Cap at 1000
        db::get_agent_metrics(&state.db, id, limit)
            .await
            .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?
    };

    Ok(Json(metrics))
}

/// Get summary metrics across all agents
/// Requires authentication.
pub async fn get_summary(
    State(state): State<AppState>,
    _user: AuthUser,
) -> Result<Json<MetricsSummary>, (StatusCode, String)> {
    let summary = db::get_metrics_summary(&state.db)
        .await
        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;

    Ok(Json(summary))
}