<?php

namespace App\Http\Controllers;

use App\Http\Requests\RainfallRequest;
use App\Http\Resources\RainfallCollection;
use App\Http\Resources\RainfallResource;
use App\Models\Rainfall;
use Carbon\Carbon;
use Illuminate\Http\Request;

class RainfallController extends Controller
{
    /**
     * Display a listing of the rainfalls.
     */
    public function index(Request $request)
    {
        $rainfalls = $request->user()
            ->rainfalls()
            ->orderByDesc('date')
            ->paginate(15);

        return new RainfallCollection($rainfalls);
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(RainfallRequest $request)
    {
        $rainfall = $request->user()->rainfalls()->create($request->validated());

        return response()->json(new RainfallResource($rainfall), 201);
    }

    /**
     * Display the specified resource.
     */
    public function show(Request $request, Rainfall $rainfall)
    {
        $rainfall = $request->user()->rainfalls()
            ->where('id', $rainfall->id)
            ->first();

        return response()->json(new RainfallResource($rainfall));
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(RainfallRequest $request, Rainfall $rainfall)
    {
        $rainfall = $request->user()->rainfalls()
            ->where('id', $rainfall->id)
            ->first()?->update($request->validated());

        return response()->json(new RainfallResource($rainfall));
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(Request $request, Rainfall $rainfall)
    {
        $request->user()->rainfalls()
            ->where('id', $rainfall->id)
            ->first()?->delete();

        return response()->noContent();
    }

    public function lastRainfalls(Request $request)
    {
        $rainfalls = $request->user()
            ->rainfalls()
            ->orderByDesc('date')
            ->limit(5)
            ->get();

        return response()->json(RainfallResource::collection($rainfalls));
    }

    public function graphValue(Request $request)
    {
        $data = $request->validate([
            'start' => 'date',
            'end' => 'date',
            'period' => ['regex:/^day|week|month|year$/'],
        ]);

        $rainfalls = $request->user()
            ->rainfalls()
            ->whereBetween('date', [$data['start'], $data['end']])
            ->orderBy('date')
            ->get();

        $results = [];
        $currentDate = $data['start'];
        while ($currentDate <= $data['end']) {
            $key = Rainfall::getDateKey($currentDate, $data['period']);
            if (! isset($results[$key])) {
                $keyData = Rainfall::getDateKeyData($currentDate, $data);
                $results[$key] = [...$keyData, 'value' => 0];
            }

            $results[$key]['value'] += $rainfalls->where('date', new Carbon($currentDate))->sum('value');
            $currentDate = (new Carbon($currentDate))->addDay()->format('Y-m-d');
        }

        return response()->json(array_values($results));
    }

    public function lastMonths(Request $request)
    {
        $lang = array_values(array_filter($request->getLanguages(), fn ($v) => str_contains($v, '_')))[0] ?? 'en_US';
        setlocale(LC_TIME, $lang);
        Carbon::setLocale(explode('_', $lang)[0]);

        $firstOfLastYear = now()->subYear()->firstOfYear();
        $diff = now()->diffInMonths($firstOfLastYear);

        $result = [];
        for ($i = $diff; $i >= 0; $i--) {
            $date = now()->subMonths($i);
            $month = $date->month;
            $firstOfMonth = now()->subMonths($i)->firstOfMonth();
            $lastOfMonth = now()->subMonths($i)->lastOfMonth();
            $rainfalls = $request->user()
                ->rainfalls()
                ->whereBetween('date', [$firstOfMonth, $lastOfMonth])
                ->sum('value');

            if (! isset($result[$month])) {
                $result[$month] = [];
            }

            $result[$month][] = [
                'year' => $date->year,
                'month' => $date->month,
                'label' => $date->monthName.' '.$date->year,
                'values' => (int) $rainfalls,
            ];
        }

        return response()->json($result);
    }
}