<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Ticket;
use App\Models\TicketCategory;
use App\Models\TicketMessage;
use App\Models\User;
use hg\apidoc\annotation as Apidoc;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

#[Apidoc\Title('工单管理')]
class TicketController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth:api');
        $this->middleware('permission:tickets.use|platform.tickets.view|platform.tickets.manage,api')->only(['index', 'show']);
        $this->middleware('permission:tickets.use,api')->only(['store']);
        $this->middleware('permission:tickets.use|platform.tickets.manage,api')->only(['reply']);
        $this->middleware('permission:platform.tickets.manage,api')->only(['update']);
    }

    #[Apidoc\Title('工单列表'), Apidoc\Method('GET'), Apidoc\Url('/tickets')]
    public function index(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'per_page' => ['nullable', 'integer', 'min:1', 'max:100'],
            'status' => ['nullable', 'string', Rule::in(Ticket::STATUSES)],
            'category_id' => ['nullable', 'integer', 'exists:ticket_categories,id'],
            'mine' => ['nullable', 'boolean'],
        ]);

        /** @var User $user */
        $user = auth('api')->user();
        $canViewAll = $this->canViewAllTickets($user);
        $query = Ticket::query()
            ->with(['user:id,nickname,email,phone', 'category', 'assignedUser:id,nickname,email'])
            ->withCount('messages')
            ->latest('last_replied_at')
            ->latest();

        if (! $canViewAll || (bool) ($validated['mine'] ?? false)) {
            $query->where('user_id', $user->id);
        }

        if (! empty($validated['status'])) {
            $query->where('status', $validated['status']);
        }

        if (! empty($validated['category_id'])) {
            $query->where('ticket_category_id', (int) $validated['category_id']);
        }

        $tickets = $query->paginate((int) ($validated['per_page'] ?? 20));

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $tickets]);
    }

    #[Apidoc\Title('提交工单'), Apidoc\Method('POST'), Apidoc\Url('/tickets')]
    public function store(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'ticket_category_id' => ['required', 'integer', 'exists:ticket_categories,id'],
            'title' => ['required', 'string', 'max:255'],
            'content' => ['required', 'string', 'max:10000'],
        ]);

        $category = TicketCategory::query()
            ->where('is_active', true)
            ->findOrFail((int) $validated['ticket_category_id']);

        /** @var User $user */
        $user = auth('api')->user();
        $ticket = Ticket::query()->create([
            'user_id' => $user->id,
            'ticket_category_id' => $category->id,
            'title' => $validated['title'],
            'content' => $validated['content'],
            'status' => Ticket::StatusOpen,
            'last_replied_at' => now(),
        ]);
        $ticket->messages()->create([
            'user_id' => $user->id,
            'sender_type' => TicketMessage::SenderUser,
            'content' => $validated['content'],
        ]);

        $this->auditLog($request, 'ticket_create', ['metadata' => ['ticket_id' => $ticket->id]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $ticket->load(['user', 'category', 'messages.user'])], 201);
    }

    #[Apidoc\Title('工单详情'), Apidoc\Method('GET'), Apidoc\Url('/tickets/{id}')]
    public function show(int $id): JsonResponse
    {
        $ticket = Ticket::query()
            ->with(['user:id,nickname,email,phone', 'category', 'assignedUser:id,nickname,email', 'messages.user:id,nickname,email'])
            ->findOrFail($id);

        $this->authorizeTicketAccess($ticket);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $ticket]);
    }

    #[Apidoc\Title('更新工单状态'), Apidoc\Method('PUT'), Apidoc\Url('/tickets/{id}')]
    public function update(Request $request, int $id): JsonResponse
    {
        $ticket = Ticket::query()->findOrFail($id);
        $validated = $request->validate([
            'status' => ['required', 'string', Rule::in(Ticket::STATUSES)],
            'ticket_category_id' => ['nullable', 'integer', 'exists:ticket_categories,id'],
        ]);

        /** @var User $user */
        $user = auth('api')->user();
        $status = (string) $validated['status'];
        $ticket->fill([
            'status' => $status,
            'assigned_user_id' => $user->id,
            'closed_at' => in_array($status, [Ticket::StatusResolved, Ticket::StatusClosed], true) ? now() : null,
        ]);
        if (array_key_exists('ticket_category_id', $validated)) {
            $ticket->ticket_category_id = $validated['ticket_category_id'];
        }
        $ticket->save();

        $this->auditLog($request, 'ticket_update', ['metadata' => ['ticket_id' => $ticket->id, 'status' => $status]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $ticket->fresh(['user', 'category', 'assignedUser'])]);
    }

    #[Apidoc\Title('回复工单'), Apidoc\Method('POST'), Apidoc\Url('/tickets/{id}/messages')]
    public function reply(Request $request, int $id): JsonResponse
    {
        $ticket = Ticket::query()->findOrFail($id);
        $this->authorizeTicketAccess($ticket);
        $validated = $request->validate([
            'content' => ['required', 'string', 'max:10000'],
        ]);

        /** @var User $user */
        $user = auth('api')->user();
        $isOwnTicket = (int) $ticket->user_id === (int) $user->id;
        $isAdminReply = $this->canManageTickets($user);
        if (! $isAdminReply && (! $isOwnTicket || ! $user->can('tickets.use'))) {
            abort(403, '无权限回复该工单。');
        }

        $message = $ticket->messages()->create([
            'user_id' => $user->id,
            'sender_type' => $isAdminReply ? TicketMessage::SenderAdmin : TicketMessage::SenderUser,
            'content' => $validated['content'],
        ]);
        $ticket->update([
            'assigned_user_id' => $isAdminReply ? $user->id : $ticket->assigned_user_id,
            'status' => $isAdminReply && $ticket->status === Ticket::StatusOpen ? Ticket::StatusProcessing : $ticket->status,
            'last_replied_at' => now(),
        ]);

        $this->auditLog($request, 'ticket_reply', ['metadata' => ['ticket_id' => $ticket->id, 'ticket_message_id' => $message->id]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $message->load('user')], 201);
    }

    private function authorizeTicketAccess(Ticket $ticket): void
    {
        /** @var User $user */
        $user = auth('api')->user();
        if ($this->canViewAllTickets($user) || (int) $ticket->user_id === (int) $user->id) {
            return;
        }

        abort(403, '无权限查看该工单。');
    }

    private function canViewAllTickets(User $user): bool
    {
        return $user->can('platform.tickets.view') || $user->can('platform.tickets.manage');
    }

    private function canManageTickets(User $user): bool
    {
        return $user->can('platform.tickets.manage');
    }
}