<?php

namespace App\Http\Controllers\Api\V1\Admin;

use App\Http\Controllers\Api\V1\ApiController;
use App\Http\Requests\Route\StoreRouteRequest;
use App\Http\Requests\Route\UpdateRouteRequest;
use App\Http\Resources\RouteResource;
use App\Models\Route;
use App\Models\RouteStop;
use App\Services\Route\RouteCalculator;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class AdminRouteController extends ApiController
{
    public function __construct(private readonly RouteCalculator $calc) {}

    public function index(Request $request): JsonResponse
    {
        $request->validate([
            'status' => ['nullable', 'in:active,inactive'],
            'area_id' => ['nullable', 'integer'],
            'q' => ['nullable', 'string', 'max:100'],
            'per_page' => ['nullable', 'integer', 'min:1', 'max:500'],
        ]);

        $perPage = (int) $request->input('per_page', 25);

        $routes = Route::query()
            ->with(['area', 'defaultDumpsite', 'tenant'])
            ->withCount('stops')
            ->when($request->filled('status'), fn ($q) => $q->where('status', $request->string('status')))
            ->when($request->filled('area_id'), fn ($q) => $q->where('area_id', $request->integer('area_id')))
            ->when($request->filled('q'), function ($q) use ($request) {
                $term = '%'.$request->string('q').'%';
                $q->where(fn ($qq) => $qq->where('name', 'like', $term)->orWhere('code', 'like', $term));
            })
            ->orderBy('name')
            ->paginate($perPage);

        return $this->ok(
            RouteResource::collection($routes),
            null,
            [
                'page' => $routes->currentPage(),
                'per_page' => $routes->perPage(),
                'total' => $routes->total(),
                'last_page' => $routes->lastPage(),
            ],
        );
    }

    public function store(StoreRouteRequest $request): JsonResponse
    {
        $data = $request->validated();

        $route = DB::transaction(function () use ($data, $request) {
            $route = Route::create([
                'name' => $data['name'],
                'code' => $data['code'],
                'area_id' => $data['area_id'] ?? null,
                'default_dumpsite_id' => $data['default_dumpsite_id'] ?? null,
                'default_team_id' => $data['default_team_id'] ?? null,
                'status' => $data['status'] ?? Route::STATUS_ACTIVE,
                'notes' => $data['notes'] ?? null,
                'created_by_admin_id' => $request->user()->id,
            ]);

            $this->syncStops($route, $data['stops']);

            return $route;
        });

        $this->calc->recompute($route);

        return $this->created(
            new RouteResource($route->fresh()->load(['area', 'defaultDumpsite', 'stops.dropOffPoint'])->loadCount('stops')),
            'Route created',
        );
    }

    public function show(Route $route): JsonResponse
    {
        $route->load(['area', 'defaultDumpsite', 'stops.dropOffPoint.barangay'])
            ->loadCount('stops');

        return $this->ok(new RouteResource($route));
    }

    public function update(UpdateRouteRequest $request, Route $route): JsonResponse
    {
        $data = $request->validated();
        $stopsPayload = $data['stops'] ?? null;
        unset($data['stops']);

        DB::transaction(function () use ($route, $data, $stopsPayload) {
            $route->update($data);

            if ($stopsPayload !== null) {
                $this->syncStops($route, $stopsPayload);
            }
        });

        $this->calc->recompute($route);

        return $this->ok(
            new RouteResource($route->fresh()->load(['area', 'defaultDumpsite', 'stops.dropOffPoint'])->loadCount('stops')),
            'Route updated',
        );
    }

    public function destroy(Route $route): JsonResponse
    {
        $route->delete();

        return $this->ok(null, 'Route deleted');
    }

    public function clone(Request $request, Route $route): JsonResponse
    {
        $request->validate([
            'name' => ['nullable', 'string', 'max:191'],
            'code' => ['nullable', 'string', 'max:32'],
        ]);

        $newCode = $request->string('code')->isEmpty()
            ? $route->code.'-COPY-'.strtoupper(Str::random(4))
            : (string) $request->string('code');
        $newName = $request->string('name')->isEmpty()
            ? $route->name.' (copy)'
            : (string) $request->string('name');

        $clone = DB::transaction(function () use ($route, $request, $newCode, $newName) {
            $clone = Route::create([
                'name' => $newName,
                'code' => $newCode,
                'area_id' => $route->area_id,
                'default_dumpsite_id' => $route->default_dumpsite_id,
                'default_team_id' => $route->default_team_id,
                'status' => Route::STATUS_INACTIVE,
                'notes' => $route->notes,
                'created_by_admin_id' => $request->user()->id,
            ]);

            $payload = $route->stops->map(fn ($s) => [
                'drop_off_point_id' => $s->drop_off_point_id,
                'estimated_duration_minutes' => $s->estimated_duration_at_stop_minutes,
            ])->all();
            $this->syncStops($clone, $payload);

            return $clone;
        });

        $this->calc->recompute($clone);

        return $this->created(
            new RouteResource($clone->fresh()->load(['area', 'defaultDumpsite', 'stops.dropOffPoint'])->loadCount('stops')),
            'Route cloned',
        );
    }

    /**
     * Replace the route's stops with the given ordered list. Sequence is
     * derived from array position (1-based) so admin can drag-reorder
     * client-side and just submit the new order.
     */
    private function syncStops(Route $route, array $stops): void
    {
        $route->stops()->delete();

        foreach (array_values($stops) as $i => $stop) {
            RouteStop::create([
                'route_id' => $route->id,
                'drop_off_point_id' => $stop['drop_off_point_id'],
                'sequence' => $i + 1,
                'estimated_duration_at_stop_minutes' => $stop['estimated_duration_minutes'] ?? 10,
            ]);
        }
    }
}