<?php

namespace App\Http\Controllers\API;

use App\Http\Controllers\Controller;
use App\Http\Resources\TripResource;
use App\Models\Trip;
use Illuminate\Http\Request;

class TripController extends Controller
{
    /**
     * Display a listing of user's trips
     */
    public function index(Request $request)
    {
        $trips = $request->user()
            ->trips()
            ->withCount('cities')
            ->latest()
            ->get();

        return TripResource::collection($trips);
    }

    /**
     * Store a newly created trip
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => 'required|string|max:255',
            'description' => 'nullable|string',
            'city_ids' => 'nullable|array',
            'city_ids.*' => 'exists:cities,id',
        ]);

        $trip = $request->user()->trips()->create([
            'name' => $validated['name'],
            'description' => $validated['description'] ?? null,
        ]);

        // Attach cities if provided
        if (!empty($validated['city_ids'])) {
            $cityData = [];
            foreach ($validated['city_ids'] as $index => $cityId) {
                $cityData[$cityId] = ['order' => $index];
            }
            $trip->cities()->attach($cityData);
        }

        $trip->load('cities')->loadCount('cities');

        return new TripResource($trip);
    }

    /**
     * Display the specified trip
     */
    public function show(Request $request, Trip $trip)
    {
        // Check if trip belongs to user
        if ($trip->user_id !== $request->user()->id) {
            return response()->json([
                'message' => 'Unauthorized',
            ], 403);
        }

        $trip->load('cities')->loadCount('cities');

        return new TripResource($trip);
    }

    /**
     * Update the specified trip
     */
    public function update(Request $request, Trip $trip)
    {
        // Check if trip belongs to user
        if ($trip->user_id !== $request->user()->id) {
            return response()->json([
                'message' => 'Unauthorized',
            ], 403);
        }

        $validated = $request->validate([
            'name' => 'sometimes|required|string|max:255',
            'description' => 'nullable|string',
            'city_ids' => 'nullable|array',
            'city_ids.*' => 'exists:cities,id',
        ]);

        $trip->update([
            'name' => $validated['name'] ?? $trip->name,
            'description' => $validated['description'] ?? $trip->description,
        ]);

        // Update cities if provided
        if (isset($validated['city_ids'])) {
            $cityData = [];
            foreach ($validated['city_ids'] as $index => $cityId) {
                $cityData[$cityId] = ['order' => $index];
            }
            $trip->cities()->sync($cityData);
        }

        $trip->load('cities')->loadCount('cities');

        return new TripResource($trip);
    }

    /**
     * Remove the specified trip
     */
    public function destroy(Request $request, Trip $trip)
    {
        // Check if trip belongs to user
        if ($trip->user_id !== $request->user()->id) {
            return response()->json([
                'message' => 'Unauthorized',
            ], 403);
        }

        $trip->delete();

        return response()->json([
            'message' => 'Trip deleted successfully',
        ]);
    }
}