<?php

namespace App\Http\Controllers\Api\Employee;

use App\Http\Controllers\Controller;
use App\Models\Attendance;
use App\Models\Location;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Carbon\Carbon;

class AttendanceController extends Controller
{
    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'type' => 'required|in:in,out',
            'latitude' => 'required|numeric|between:-90,90',
            'longitude' => 'required|numeric|between:-180,180',
            'photo' => 'required|image|mimes:jpeg,png,jpg|max:5120', // 5MB
        ]);

        if ($validator->fails()) {
            return response()->json([
                'message' => Str::ucfirst($validator->errors()->first()),
                'data' => null
            ], 422);
        }

        $user = auth()->user();
        $today = Carbon::today()->toDateString();

        $existingAttendance = Attendance::where('user_id', $user->id)
            ->where('date', $today)
            ->where('type', $request->type)
            ->whereNotIn('status', ['rejected'])
            ->first();

        if ($existingAttendance) {
            $typeText = $request->type == 'in' ? 'masuk' : 'keluar';
            return response()->json([
                'message' => "Anda sudah melakukan absen {$typeText} hari ini.",
                'data' => null
            ], 422);
        }

        if ($request->type == 'out') {
            $clockInRecord = Attendance::where('user_id', $user->id)
                ->where('date', $today)
                ->where('type', 'in')
                ->first();

            if (!$clockInRecord) {
                return response()->json([
                    'message' => 'Anda belum melakukan absen masuk hari ini.',
                    'data' => null
                ], 422);
            }
        }

        $photoPath = null;
        if ($request->hasFile('photo')) {
            $photo = $request->file('photo');
            $filename = time() . '_' . $user->id . '_' . $request->type . '.' . $photo->getClientOriginalExtension();
            $photoPath = $photo->storeAs('attendances', $filename, 'public');
        }

        // Tentukan status late atau accepted
        $now = Carbon::now();
        $status = 'accepted';
        if ($request->type == 'in' && $now->format('H:i:s') > '08:00:00') {
            $status = 'late';
        }
        if ($request->type == 'out' && $now->format('H:i:s') > '17:00:00') {
            $status = 'late';
        }

        $nearestLocation = $this->findNearestLocation($request->latitude, $request->longitude);
        if (!$nearestLocation) {
            return response()->json([
                'message' => 'Lokasi Anda di luar area yang diizinkan untuk absen.',
                'data' => null
            ], 422);
        }

        $attendance = Attendance::create([
            'user_id' => $user->id,
            'date' => $today,
            'type' => $request->type,
            'time' => Carbon::now()->format('H:i:s'),
            'photo' => $photoPath,
            'latitude' => $request->latitude,
            'longitude' => $request->longitude,
            'location_id' => $nearestLocation->id,
            'status' => $status
        ]);

        return response()->json([
            'message' => 'Absensi berhasil dicatat.',
            'data' => $attendance->load(['location'])
        ], 200);
    }

    public function history(Request $request)
    {
        $user = auth()->user();
        $data = Attendance::where('user_id', $user->id)->with(['location']);

        if ($request->has('date') && !empty($request->start_date)) {
            $data->where('date', '>=', $request->start_date);
        }

        if ($request->has('end_date') && !empty($request->end_date)) {
            $data->where('date', '<=', $request->end_date);
        }

        if ($request->has('status') && !empty($request->status)) {
            $data->where('status', $request->status);
        }

        if ($request->has('type') && !empty($request->type)) {
            $data->where('type', $request->type);
        }

        $total_data = $data->get()->count();
        $length = intval($request->input('length', 10));
        $start = intval($request->input('start', 0));

        $data = $data->orderBy("date", "desc")->orderBy("time", "desc");
        if (!$length && !$start) {
            $data = $data->get();
        } else {
            $data = $data->skip($start)->take($length)->get();
        }

        return response()->json([
            'message' => 'Data berhasil diambil.',
            'data' => $data,
            'recordsTotal' => $total_data,
            'recordsFiltered' => $total_data,
        ], 200);
    }

    public function todayStatus()
    {
        $user = auth()->user();
        $today = Carbon::today()->toDateString();

        $clockIn = Attendance::where('user_id', $user->id)
            ->where('date', $today)
            ->where('type', 'in')
            ->first();

        $clockOut = Attendance::where('user_id', $user->id)
            ->where('date', $today)
            ->where('type', 'out')
            ->first();

        return response()->json([
            'message' => 'Status absensi hari ini berhasil diambil.',
            'data' => [
                'clock_in' => $clockIn,
                'clock_out' => $clockOut,
                'can_clock_in' => !$clockIn,
                'can_clock_out' => $clockIn && !$clockOut
            ]
        ], 200);
    }

    public function checkLocation(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'latitude' => 'required|numeric|between:-90,90',
            'longitude' => 'required|numeric|between:-180,180',
        ]);
        if ($validator->fails()) {
            return response()->json([
                'valid' => false,
                'message' => $validator->errors()->first(),
                'data' => null
            ], 422);
        }
        $location = $this->findNearestLocation($request->latitude, $request->longitude);
        if ($location) {
            return response()->json([
                'valid' => true,
                'message' => 'Lokasi valid untuk check-in.',
                'data' => $location
            ], 200);
        } else {
            return response()->json([
                'valid' => false,
                'message' => 'Lokasi Anda di luar area yang diizinkan untuk absen.',
                'data' => null
            ], 200);
        }
    }

    private function findNearestLocation($latitude, $longitude)
    {
        $locations = Location::all();
        foreach ($locations as $location) {
            $distance = $this->calculateDistance(
                $latitude,
                $longitude,
                $location->center_lat,
                $location->center_lng
            );
            // $distance dalam kilometer, radius dalam meter
            if ($distance * 1000 <= $location->radius) {
                return $location;
            }
        }
        return null;
    }

    private function calculateDistance($lat1, $lon1, $lat2, $lon2)
    {
        $earthRadius = 6371; // km

        $dLat = deg2rad($lat2 - $lat1);
        $dLon = deg2rad($lon2 - $lon1);

        $a = sin($dLat/2) * sin($dLat/2) + cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * sin($dLon/2) * sin($dLon/2);
        $c = 2 * atan2(sqrt($a), sqrt(1-$a));

        return $earthRadius * $c;
    }

    public function areas()
    {
        // Ambil semua Location. Jika perlu filter aktif, tambahkan where.
        $locations = Location::all()->map(function($loc) {
            return [
                'id' => $loc->id,
                'center_lat' => (float) $loc->center_lat,
                'center_lng' => (float) $loc->center_lng,
                'radius' => (float) $loc->radius,
                'name' => $loc->name ?? null,
            ];
        });
        return response()->json($locations, 200);
    }
}