<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Http;

class MapController extends Controller
{
    /** 苏州大致范围（minLng,minLat,maxLng,maxLat） */
    private const SUZHOU_MAP_BOUND = '119.90,30.75,121.35,32.05';

    /** 天地图「服务端」Key（与浏览器 Key 不同）；未配置则搜索/逆地理走腾讯 WebService */
    private function tiandituServerTk(): ?string
    {
        $key = trim((string) env('TIANDITU_SERVER_TK', ''));
        if ($key !== '') {
            return $key;
        }

        return null;
    }

    private function tencentServerKey(): string
    {
        $key = trim((string) env('TENCENT_MAP_SERVER_KEY', ''));
        abort_unless($key !== '', 500, '未配置腾讯地图服务端 Key（TENCENT_MAP_SERVER_KEY）');

        return $key;
    }

    public function search(Request $request): JsonResponse
    {
        $data = $request->validate([
            'keyword' => ['required', 'string', 'max:120'],
            'region' => ['nullable', 'string', 'max:80'],
        ]);

        $tk = $this->tiandituServerTk();
        if ($tk !== null) {
            $rows = $this->searchTianditu($data['keyword'], $tk);
            if ($rows !== null) {
                return response()->json($rows);
            }
        }

        return response()->json($this->searchTencent($data['keyword'], $data['region'] ?? '苏州'));
    }

    public function reverseGeocode(Request $request): JsonResponse
    {
        $data = $request->validate([
            'lat' => ['required', 'numeric'],
            'lng' => ['required', 'numeric'],
        ]);

        $tk = $this->tiandituServerTk();
        if ($tk !== null) {
            $row = $this->reverseTianditu((float) $data['lat'], (float) $data['lng'], $tk);
            if ($row !== null) {
                return response()->json($row);
            }
        }

        return response()->json($this->reverseTencent((float) $data['lat'], (float) $data['lng']));
    }

    /** @return array<int, array<string, mixed>>|null null 表示应回退腾讯 */
    private function searchTianditu(string $keyword, string $tk): ?array
    {
        $postStr = json_encode([
            'keyWord' => $keyword,
            'level' => 12,
            'mapBound' => self::SUZHOU_MAP_BOUND,
            'queryType' => 1,
            'start' => 0,
            'count' => 15,
        ], JSON_UNESCAPED_UNICODE);

        $resp = Http::get('https://api.tianditu.gov.cn/v2/search', [
            'postStr' => $postStr,
            'type' => 'query',
            'tk' => $tk,
        ])->json();

        if (! is_array($resp)) {
            return null;
        }

        if ($this->tiandituApiFailed($resp)) {
            return null;
        }

        $pois = $resp['pois'] ?? $resp['data'] ?? [];
        if (! is_array($pois)) {
            return [];
        }

        return collect($pois)->map(function ($item) {
            $item = is_array($item) ? $item : [];
            $lonlat = (string) ($item['lonlat'] ?? $item['lonLat'] ?? '');
            $lng = null;
            $lat = null;
            if ($lonlat !== '' && str_contains($lonlat, ',')) {
                [$lngRaw, $latRaw] = array_map('trim', explode(',', $lonlat, 2));
                $lng = is_numeric($lngRaw) ? (float) $lngRaw : null;
                $lat = is_numeric($latRaw) ? (float) $latRaw : null;
            }
            if ($lat === null) {
                $lat = data_get($item, 'lat') ?? data_get($item, 'location.lat');
            }
            if ($lng === null) {
                $lng = data_get($item, 'lng') ?? data_get($item, 'lon') ?? data_get($item, 'location.lng');
            }

            return [
                'title' => $item['name'] ?? $item['title'] ?? '',
                'address' => $item['address'] ?? '',
                'province' => $item['province'] ?? '',
                'city' => $item['city'] ?? $item['cityName'] ?? '',
                'district' => $item['district'] ?? $item['county'] ?? '',
                'lat' => $lat,
                'lng' => $lng,
            ];
        })->filter(fn ($row) => $row['lat'] !== null && $row['lng'] !== null)->values()->all();
    }

    /** @return array<int, array<string, mixed>> */
    private function searchTencent(string $keyword, string $region): array
    {
        $resp = Http::get('https://apis.map.qq.com/ws/place/v1/suggestion', [
            'keyword' => $keyword,
            'region' => $region,
            'region_fix' => 1,
            'key' => $this->tencentServerKey(),
        ])->json();

        $status = (int) ($resp['status'] ?? -1);
        if ($status === 121) {
            abort(422, '腾讯地图 WebService Key 每日调用量已达上限。请配置 TIANDITU_SERVER_TK 或更换腾讯 Key。');
        }
        if ($status !== 0) {
            abort(422, $resp['message'] ?? '地图搜索失败');
        }

        return collect($resp['data'] ?? [])->map(function ($item) {
            return [
                'title' => $item['title'] ?? '',
                'address' => $item['address'] ?? '',
                'province' => $item['province'] ?? '',
                'city' => $item['city'] ?? '',
                'district' => $item['district'] ?? '',
                'lat' => data_get($item, 'location.lat'),
                'lng' => data_get($item, 'location.lng'),
            ];
        })->filter(fn ($row) => $row['lat'] !== null && $row['lng'] !== null)->values()->all();
    }

    /** @return array<string, mixed>|null */
    private function reverseTianditu(float $lat, float $lng, string $tk): ?array
    {
        $postStr = json_encode([
            'lon' => $lng,
            'lat' => $lat,
            'ver' => 1,
        ], JSON_UNESCAPED_UNICODE);

        $resp = Http::get('https://api.tianditu.gov.cn/geocoder', [
            'postStr' => $postStr,
            'type' => 'geocode',
            'tk' => $tk,
        ])->json();

        if (! is_array($resp) || $this->tiandituApiFailed($resp)) {
            return null;
        }

        $result = $resp['result'] ?? [];
        $addr = is_array($result) ? ($result['formatted_address'] ?? $result['address'] ?? '') : '';
        $comp = is_array($result) ? ($result['addressComponent'] ?? []) : [];

        return [
            'address' => $addr,
            'province' => data_get($comp, 'province'),
            'city' => data_get($comp, 'city'),
            'district' => data_get($comp, 'district') ?? data_get($comp, 'county'),
        ];
    }

    /** @return array<string, mixed> */
    private function reverseTencent(float $lat, float $lng): array
    {
        $resp = Http::get('https://apis.map.qq.com/ws/geocoder/v1/', [
            'location' => $lat . ',' . $lng,
            'get_poi' => 0,
            'key' => $this->tencentServerKey(),
        ])->json();

        $status = (int) ($resp['status'] ?? -1);
        if ($status === 121) {
            abort(422, '腾讯地图 WebService Key 每日调用量已达上限。请配置 TIANDITU_SERVER_TK 或更换腾讯 Key。');
        }
        if ($status !== 0) {
            abort(422, $resp['message'] ?? '逆地理编码失败');
        }

        $result = $resp['result'] ?? [];

        return [
            'address' => $result['address'] ?? '',
            'province' => data_get($result, 'address_component.province'),
            'city' => data_get($result, 'address_component.city'),
            'district' => data_get($result, 'address_component.district'),
        ];
    }

    /** @param array<string, mixed> $resp */
    private function tiandituApiFailed(array $resp): bool
    {
        $code = $resp['code'] ?? $resp['status'] ?? null;
        if ($code === 301012 || (is_string($resp['msg'] ?? null) && str_contains((string) $resp['msg'], '权限'))) {
            return true;
        }
        if ($code !== null && (string) $code !== '0' && (int) $code !== 0) {
            return true;
        }

        return false;
    }
}