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import { useState, useEffect, useCallback } from 'react';
import { eq, desc, and, inArray } from 'drizzle-orm';
import { useDatabase } from './useDatabase';
import { rides } from '../db/schema';

// ─── Types ─────────────────────────────────────────────────────────────────────

type RideStatus = 'searching' | 'matched' | 'in_progress' | 'completed' | 'cancelled';

interface RideData {
  id: string;
  userId: string;
  originAddress: string;
  originLatitude: number;
  originLongitude: number;
  destinationAddress: string;
  destinationLatitude: number;
  destinationLongitude: number;
  routePolyline: string | null;
  scheduledTime: string | null;
  status: RideStatus;
  seatPrice: number | null;
  totalDistance: number | null;
  estimatedDuration: number | null;
  createdAt: string | null;
  updatedAt: string | null;
}

interface NewRide {
  id: string;
  userId: string;
  originAddress: string;
  originLatitude: number;
  originLongitude: number;
  destinationAddress: string;
  destinationLatitude: number;
  destinationLongitude: number;
  routePolyline?: string;
  scheduledTime?: string;
  seatPrice?: number;
  totalDistance?: number;
  estimatedDuration?: number;
}

interface UseRidesReturn {
  rides: RideData[];
  activeRide: RideData | null;
  loading: boolean;
  createRide: (data: NewRide) => Promise<RideData | null>;
  updateRideStatus: (rideId: string, status: RideStatus) => Promise<void>;
  getRideById: (rideId: string) => Promise<RideData | null>;
  refresh: () => Promise<void>;
}

// ─── Hook ──────────────────────────────────────────────────────────────────────

export function useRides(statusFilter?: RideStatus[]): UseRidesReturn {
  const { db } = useDatabase();
  const [ridesList, setRidesList] = useState<RideData[]>([]);
  const [loading, setLoading] = useState(true);

  // ── Load rides ───────────────────────────────────────────────────────────────

  const loadRides = useCallback(async () => {
    try {
      setLoading(true);

      const activeStatuses: RideStatus[] = ['searching', 'matched', 'in_progress'];

      // Always load active rides
      const allRides = await db
        .select()
        .from(rides)
        .orderBy(desc(rides.createdAt))
        .all();

      let filtered: typeof allRides = allRides;

      if (statusFilter && statusFilter.length > 0) {
        filtered = allRides.filter((r) => statusFilter.includes(r.status as RideStatus));
      }

      setRidesList(filtered as RideData[]);
    } catch (error) {
      console.error('[useRides] Failed to load rides:', error);
      setRidesList([]);
    } finally {
      setLoading(false);
    }
  }, [db, statusFilter]);

  useEffect(() => {
    loadRides();
  }, [loadRides]);

  // ── Active ride (first non-completed, non-cancelled) ─────────────────────────

  const activeRide =
    ridesList.find(
      (r) => r.status === 'searching' || r.status === 'matched' || r.status === 'in_progress',
    ) ?? null;

  // ── Create ride ──────────────────────────────────────────────────────────────

  const createRide = useCallback(
    async (data: NewRide): Promise<RideData | null> => {
      try {
        await db.insert(rides).values({
          id: data.id,
          userId: data.userId,
          originAddress: data.originAddress,
          originLatitude: data.originLatitude,
          originLongitude: data.originLongitude,
          destinationAddress: data.destinationAddress,
          destinationLatitude: data.destinationLatitude,
          destinationLongitude: data.destinationLongitude,
          routePolyline: data.routePolyline ?? null,
          scheduledTime: data.scheduledTime ?? null,
          seatPrice: data.seatPrice ?? null,
          totalDistance: data.totalDistance ?? null,
          estimatedDuration: data.estimatedDuration ?? null,
        }).run();

        await loadRides();

        const created = ridesList.find((r) => r.id === data.id);
        return (created as RideData) ?? null;
      } catch (error) {
        console.error('[useRides] Failed to create ride:', error);
        return null;
      }
    },
    [db, loadRides, ridesList],
  );

  // ── Update ride status ───────────────────────────────────────────────────────

  const updateRideStatus = useCallback(
    async (rideId: string, status: RideStatus) => {
      try {
        await db
          .update(rides)
          .set({ status, updatedAt: new Date().toISOString() })
          .where(eq(rides.id, rideId))
          .run();

        await loadRides();
      } catch (error) {
        console.error('[useRides] Failed to update ride status:', error);
      }
    },
    [db, loadRides],
  );

  // ── Get ride by ID ───────────────────────────────────────────────────────────

  const getRideById = useCallback(
    async (rideId: string): Promise<RideData | null> => {
      try {
        const results = await db
          .select()
          .from(rides)
          .where(eq(rides.id, rideId))
          .all();

        return (results[0] as RideData) ?? null;
      } catch (error) {
        console.error('[useRides] Failed to get ride:', error);
        return null;
      }
    },
    [db],
  );

  return {
    rides: ridesList,
    activeRide,
    loading,
    createRide,
    updateRideStatus,
    getRideById,
    refresh: loadRides,
  };
}