// Package api provides HTTP handlers for camera operations.
package api

import (
	"log"
	"net/http"

	"github.com/cubecraft/remoterig/internal/db"
	"github.com/go-chi/chi/v5"
)

// PushStatus accepts a status update from an ESP32 node and persists it.
func PushStatus(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		cameraID := chi.URLParam(r, "id")
		if !validateCameraID(w, cameraID) {
			return
		}

		var req struct {
			BatteryPct        *int     `json:"battery_pct"`
			VideoRemainingSec *int     `json:"video_remaining_sec"`
			Recording         bool     `json:"recording"`
			Mode              string   `json:"mode"`
			Resolution        string   `json:"resolution"`
			FPS               int      `json:"fps"`
			Online            bool     `json:"online"`
			RawBatteryPct     *float64 `json:"raw_battery_pct"`
			Timestamp         *string  `json:"ts"`
		}
		if !decodeJSONBody(w, r, &req) {
			return
		}
		if !validateStatusFields(w, req.Mode, req.Resolution, req.FPS) {
			return
		}

		// Validate battery percentage range if provided
		if req.BatteryPct != nil && (*req.BatteryPct < 0 || *req.BatteryPct > 100) {
			respondError(w, http.StatusBadRequest, "battery_pct must be between 0 and 100")
			return
		}

		// Check if camera is registered
		var exists int
		err := database.QueryRowContext(r.Context(),
			"SELECT COUNT(*) FROM cameras WHERE camera_id = ?", cameraID).Scan(&exists)
		if err != nil {
			log.Printf("Error checking camera existence: %v", err)
			respondError(w, http.StatusInternalServerError, "database error", err.Error())
			return
		}
		if exists == 0 {
			respondError(w, http.StatusNotFound, "camera not found")
			return
		}

		// Insert status log
		result, err := database.ExecContext(r.Context(), `
			INSERT INTO status_logs (camera_id, battery_pct, video_remaining_sec,
			                         recording_state, mode, resolution, fps, online, raw_battery_pct)
			VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
		`, cameraID, req.BatteryPct, req.VideoRemainingSec,
			boolToInt(req.Recording), req.Mode, req.Resolution,
			req.FPS, boolToInt(req.Online), req.RawBatteryPct)
		if err != nil {
			log.Printf("Error inserting status log: %v", err)
			respondError(w, http.StatusInternalServerError, "database error", err.Error())
			return
		}

		// Check if recording state changed - update recording_events if so
		var prevRecording int
		err = database.QueryRowContext(r.Context(), `
			SELECT recording_state FROM status_logs
			WHERE camera_id = ? AND recorded_at > datetime('now', '-60 seconds')
			ORDER BY recorded_at DESC LIMIT 1
		`, cameraID).Scan(&prevRecording)
		if err == nil && prevRecording != boolToInt(req.Recording) {
			reason := "manual"
			if req.Recording {
				// Start recording - open a new event
				_, err := database.ExecContext(r.Context(), `
					INSERT INTO recording_events (camera_id, started_at, reason)
					VALUES (?, datetime('now'), ?)
				`, cameraID, reason)
				if err != nil {
					log.Printf("Error inserting recording event: %v", err)
				}
			} else {
				// Stop recording - close the most recent open event
				_, err := database.ExecContext(r.Context(), `
					UPDATE recording_events SET stopped_at = datetime('now')
					WHERE camera_id = ? AND stopped_at IS NULL
					ORDER BY started_at DESC LIMIT 1
				`, cameraID)
				if err != nil {
					log.Printf("Error updating recording event: %v", err)
				}
			}
		}

		_, _ = result.RowsAffected() // consume the result

		respondJSON(w, http.StatusOK, map[string]string{
			"status": "accepted",
		})
	}
}

// boolToInt converts a bool to 0 or 1 for SQLite storage.
func boolToInt(b bool) int {
	if b {
		return 1
	}
	return 0
}