<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Gate;
use Illuminate\Validation\Rule;
use Modules\Helpdesk\Exceptions\TicketPersistenceException;
use Modules\Helpdesk\Models\KanbanBoard;
use Modules\Helpdesk\Models\Status;
use Modules\Helpdesk\Models\Ticket;
use Modules\Helpdesk\Services\WorkflowNotificationService;

final class TicketBoardController extends Controller
{
    public function __invoke(Request $request, Ticket $ticket, WorkflowNotificationService $workflow): RedirectResponse
    {
        Gate::authorize('update', $ticket);

        $validated = $request->validate([
            'board_id' => ['required', 'integer', Rule::exists('helpdesk_kanban_boards', 'id')],
            'return_to_board_id' => ['nullable', 'integer', Rule::exists('helpdesk_kanban_boards', 'id')],
        ]);

        $targetBoardId = (int) $validated['board_id'];

        $targetBoard = KanbanBoard::query()
            ->with(['statuses' => fn ($query) => $query->orderBy('helpdesk_kanban_board_statuses.sort_order')->orderBy('helpdesk_statuses.sort_order')->orderBy('helpdesk_statuses.name')])
            ->findOrFail($targetBoardId);

        if ($targetBoard->statuses->isEmpty()) {
            $this->ensureBoardHasStatuses($targetBoardId);
            $targetBoard->load(['statuses' => fn ($query) => $query->orderBy('helpdesk_kanban_board_statuses.sort_order')->orderBy('helpdesk_statuses.sort_order')->orderBy('helpdesk_statuses.name')]);
        }

        $fresh = DB::transaction(function () use ($ticket, $targetBoard): Ticket {
            $lockedTicket = Ticket::query()
                ->visibleTo(Auth::user())
                ->lockForUpdate()
                ->findOrFail($ticket->id);

            $targetStatus = $targetBoard->statuses->firstWhere('id', (int) $lockedTicket->status_id)
                ?: $targetBoard->statuses->first();

            if ($targetStatus === null) {
                $targetStatus = Status::query()->orderBy('sort_order')->orderBy('name')->firstOrFail();
                $this->addStatusToBoard($targetBoard->id, $targetStatus->id);
            }

            $updates = [
                'board_id' => $targetBoard->id,
                'status_id' => $targetStatus->id,
                'completed_at' => $targetStatus->is_closed ? now() : null,
                'last_activity_at' => now(),
            ];

            if (DB::getSchemaBuilder()->hasColumn('helpdesk_tickets', 'updated_at')) {
                $updates['updated_at'] = now();
            }

            $affected = DB::table('helpdesk_tickets')
                ->where('id', $lockedTicket->id)
                ->update($updates);

            if ($affected < 1) {
                throw new TicketPersistenceException('Ticket board update did not persist.');
            }

            return Ticket::query()
                ->with(['status', 'priority', 'category', 'project', 'team', 'product', 'tags', 'checklistItems', 'board'])
                ->findOrFail($lockedTicket->id);
        });

        $workflow->dispatch($fresh, 'ticket.updated', Auth::user());

        return redirect()
            ->route('helpdesk.kanban', ['board_id' => $targetBoardId])
            ->with('success', 'Ticket ' . $fresh->reference . ' moved to ' . $targetBoard->name . '.');
    }

    private function ensureBoardHasStatuses(int $boardId): void
    {
        Status::query()
            ->orderBy('sort_order')
            ->orderBy('name')
            ->get(['id'])
            ->values()
            ->each(function (Status $status, int $index) use ($boardId): void {
                $this->addStatusToBoard($boardId, (int) $status->id, ($index + 1) * 10);
            });
    }

    private function addStatusToBoard(int $boardId, int $statusId, int $sortOrder = 999): void
    {
        DB::table('helpdesk_kanban_board_statuses')->updateOrInsert(
            ['board_id' => $boardId, 'status_id' => $statusId],
            ['sort_order' => $sortOrder, 'updated_at' => now(), 'created_at' => now()],
        );
    }
}