<?php

namespace App\Http\Controllers;

use App\Models\Videos;
use App\Util\VideoCalendarUtil;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller as BaseController;

class CalendarController extends BaseController
{
    public function index(Request $request)
    {
        $month_param = $request->get("month", "");
        if (preg_match("/^(\d{4})-(0[1-9]|1[0-2])$/", $month_param, $matches)) {
            $month = Carbon::createFromDate((int)$matches[1], (int)$matches[2], 1)->startOfMonth();
        } else {
            $month = Carbon::now()->startOfMonth();
        }

        $videos = Videos::query()->orderBy("created_at")->get(["id", "bvid", "title", "total_duration"]);
        $by_date = VideoCalendarUtil::group_by_live_date($videos);
        $parsed_count = array_sum(array_map("sizeof", $by_date));

        $weeks = [];
        $current_week = array_fill(0, 7, null);
        $cursor = $month->copy();
        $month_end = $month->copy()->endOfMonth();
        while ($cursor->lte($month_end)) {
            $day_index = $cursor->dayOfWeekIso - 1; // 周一为一周之始
            $date_key = $cursor->format("Y-m-d");
            $current_week[$day_index] = [
                "day" => $cursor->day,
                "videos" => $by_date[$date_key] ?? [],
                "is_today" => $cursor->isToday(),
            ];
            if ($day_index === 6) {
                $weeks[] = $current_week;
                $current_week = array_fill(0, 7, null);
            }
            $cursor->addDay();
        }
        if (sizeof(array_filter($current_week)) > 0) {
            $weeks[] = $current_week;
        }

        $month_prefix = $month->format("Y-m");
        $live_days = sizeof(array_filter(array_keys($by_date), function (string $date) use ($month_prefix) {
            return strpos($date, $month_prefix) === 0;
        }));

        $min_month = sizeof($by_date) > 0 ? Carbon::createFromFormat("Y-m-d", array_key_first($by_date))->startOfMonth() : $month->copy();
        $max_month = sizeof($by_date) > 0 ? Carbon::createFromFormat("Y-m-d", array_key_last($by_date))->startOfMonth() : $month->copy();
        $prev_month = $month->copy()->subMonth();
        $next_month = $month->copy()->addMonth();

        return view("calendar.index", [
            "weeks" => $weeks,
            "month" => $month,
            "is_current_month" => $month->eq(Carbon::now()->startOfMonth()),
            "live_days" => $live_days,
            "unparsed_count" => sizeof($videos) - $parsed_count,
            "prev_month" => $prev_month,
            "next_month" => $next_month,
            "has_prev" => $prev_month->gte($min_month),
            "has_next" => $next_month->lte($max_month),
        ]);
    }
}