<?php

namespace App\Services\PeopleCounting;

use App\Models\PeopleCountingDaily;
use App\Models\PeopleCountingHourly;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\Log;

class PeopleCountingSyncService
{
    public function __construct(
        private readonly HikPeopleCountingClient $client,
    ) {
    }

    /**
     * @return array{date: string, written: int, skipped: int, venues: int}
     */
    public function syncDailyForDate(Carbon $day, bool $protectZeroOverwrite = true): array
    {
        $json = $this->client->fetchDailySnapshot($day);
        $venues = is_array($json['venues'] ?? null) ? $json['venues'] : [];
        $statDate = $day->toDateString();
        $written = 0;
        $skipped = 0;

        foreach ($venues as $row) {
            if (! is_array($row)) {
                continue;
            }
            $venueId = (int) ($row['venueId'] ?? 0);
            if ($venueId <= 0) {
                continue;
            }
            $enter = max(0, (int) ($row['enter'] ?? 0));
            $exit = max(0, (int) ($row['exit'] ?? 0));
            $passing = max(0, (int) ($row['passing'] ?? 0));
            $updateCount = max(0, (int) ($row['updateCount'] ?? 0));
            $lastUpdate = $this->parseLastUpdate($row['lastUpdate'] ?? null);

            if ($protectZeroOverwrite && $this->shouldSkipZeroOverwrite($venueId, $statDate, $enter, $exit, $passing, $updateCount)) {
                $skipped++;
                continue;
            }

            PeopleCountingDaily::query()->updateOrCreate(
                [
                    'venue_id' => $venueId,
                    'stat_date' => $statDate,
                ],
                [
                    'venue_name' => $this->nullableName($row['venueName'] ?? null),
                    'enter' => $enter,
                    'exit' => $exit,
                    'passing' => $passing,
                    'update_count' => $updateCount,
                    'last_update' => $lastUpdate,
                ]
            );
            $written++;
        }

        return [
            'date' => $statDate,
            'written' => $written,
            'skipped' => $skipped,
            'venues' => count($venues),
        ];
    }

    /**
     * @return array{date: string, written: int, skipped: bool, data_source: string|null, venues: int}
     */
    public function syncHourlyForDate(Carbon $day, bool $skipIfAllZero = true): array
    {
        $json = $this->client->fetchHourly($day);
        $venues = is_array($json['venues'] ?? null) ? $json['venues'] : [];
        $statDate = $day->toDateString();
        $rootSource = is_string($json['dataSource'] ?? null) ? (string) $json['dataSource'] : null;

        $allZero = true;
        foreach ($venues as $row) {
            if (! is_array($row)) {
                continue;
            }
            foreach (is_array($row['hourly'] ?? null) ? $row['hourly'] : [] as $bucket) {
                if (! is_array($bucket)) {
                    continue;
                }
                if (((int) ($bucket['enter'] ?? 0)) !== 0
                    || ((int) ($bucket['exit'] ?? 0)) !== 0
                    || ((int) ($bucket['passing'] ?? 0)) !== 0) {
                    $allZero = false;
                    break 2;
                }
            }
        }

        // 全 0 且仍是内存口径：昨日归档还没生成 / Java 小时回退未上线，写入会用假 0 盖掉已有小时
        if ($skipIfAllZero && $allZero && ($rootSource === null || $rootSource === 'memory')) {
            return [
                'date' => $statDate,
                'written' => 0,
                'skipped' => true,
                'data_source' => $rootSource,
                'venues' => count($venues),
            ];
        }

        $written = 0;
        foreach ($venues as $row) {
            if (! is_array($row)) {
                continue;
            }
            $venueId = (int) ($row['venueId'] ?? 0);
            if ($venueId <= 0) {
                continue;
            }
            $name = $this->nullableName($row['venueName'] ?? null);
            $source = is_string($row['dataSource'] ?? null) ? (string) $row['dataSource'] : $rootSource;
            $hours = is_array($row['hourly'] ?? null) ? $row['hourly'] : [];
            $byHour = [];
            foreach ($hours as $bucket) {
                if (! is_array($bucket)) {
                    continue;
                }
                $h = (int) ($bucket['hour'] ?? -1);
                if ($h < 0 || $h > 23) {
                    continue;
                }
                $byHour[$h] = [
                    'enter' => max(0, (int) ($bucket['enter'] ?? 0)),
                    'exit' => max(0, (int) ($bucket['exit'] ?? 0)),
                    'passing' => max(0, (int) ($bucket['passing'] ?? 0)),
                ];
            }
            for ($h = 0; $h <= 23; $h++) {
                $vals = $byHour[$h] ?? ['enter' => 0, 'exit' => 0, 'passing' => 0];
                PeopleCountingHourly::query()->updateOrCreate(
                    [
                        'venue_id' => $venueId,
                        'stat_date' => $statDate,
                        'hour' => $h,
                    ],
                    [
                        'venue_name' => $name,
                        'enter' => $vals['enter'],
                        'exit' => $vals['exit'],
                        'passing' => $vals['passing'],
                        'data_source' => $source,
                    ]
                );
                $written++;
            }
        }

        return [
            'date' => $statDate,
            'written' => $written,
            'skipped' => false,
            'data_source' => $rootSource,
            'venues' => count($venues),
        ];
    }

    private function shouldSkipZeroOverwrite(
        int $venueId,
        string $statDate,
        int $enter,
        int $exit,
        int $passing,
        int $updateCount
    ): bool {
        if ($enter > 0 || $exit > 0 || $passing > 0 || $updateCount > 0) {
            return false;
        }
        $existing = PeopleCountingDaily::query()
            ->where('venue_id', $venueId)
            ->whereDate('stat_date', $statDate)
            ->first();
        if ($existing === null) {
            return false;
        }
        $prev = (int) $existing->enter + (int) $existing->exit + (int) $existing->passing;

        return $prev > 0;
    }

    private function parseLastUpdate(mixed $raw): ?Carbon
    {
        if (! is_string($raw) || trim($raw) === '') {
            return null;
        }
        try {
            return Carbon::parse($raw);
        } catch (\Throwable $e) {
            Log::debug('people counting lastUpdate parse failed', ['raw' => $raw, 'e' => $e->getMessage()]);

            return null;
        }
    }

    private function nullableName(mixed $name): ?string
    {
        if (! is_string($name)) {
            return null;
        }
        $t = trim($name);

        return $t === '' ? null : mb_substr($t, 0, 191);
    }
}