<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Livewire;

use Illuminate\Contracts\View\View;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Auth;
use Livewire\Component;
use Modules\Helpdesk\Models\KanbanBoard as KanbanBoardModel;
use Modules\Helpdesk\Models\Status;
use Modules\Helpdesk\Models\Ticket;
use Modules\Helpdesk\Services\WorkflowNotificationService;

final class KanbanBoard extends Component
{
    public ?int $board_id = null;

    public function mount(): void
    {
        $this->board_id = KanbanBoardModel::query()
            ->where('is_default', true)
            ->orderBy('sort_order')
            ->value('id') ?: KanbanBoardModel::query()->orderBy('sort_order')->value('id');
    }

    /**
     * Move a ticket to another workflow status on the active board.
     */
    public function moveTicket(int|string $ticketId, int|string $statusId, WorkflowNotificationService $workflow): void
    {
        $ticket = Ticket::query()->visibleTo(Auth::user())->findOrFail((int) $ticketId);
        $status = Status::query()->findOrFail((int) $statusId);
        $board = $this->activeBoard();
        $oldStatusName = $ticket->status?->name ?? 'previous status';

        $this->authorize('update', $ticket);

        if ($board !== null && ! $board->statuses()->whereKey($status->id)->exists()) {
            $this->addStatusToBoard($board->id, $status->id);
        }

        $ticket->forceFill([
            'board_id' => $board?->id,
            'status_id' => $status->id,
            'completed_at' => $status->is_closed ? now() : null,
            'last_activity_at' => now(),
        ])->save();

        $workflow->dispatch(
            $ticket->fresh(['owner', 'agent', 'status', 'priority', 'category', 'project', 'team']) ?? $ticket,
            $status->is_closed ? 'ticket.closed' : 'ticket.updated',
            Auth::user()
        );

        $message = 'Ticket '.$ticket->reference.' moved from '.$oldStatusName.' to '.$status->name.'.';
        session()->flash('success', $message);
        $this->dispatch('wms:toast', type: 'success', title: 'Ticket moved', message: $message);
    }

    /**
     * Move a ticket from its current board to another board. A ticket can only belong to one board.
     */
    public function moveTicketToBoard(int|string $ticketId, int|string|null $boardId, WorkflowNotificationService $workflow): void
    {
        $ticket = Ticket::query()->with('board')->visibleTo(Auth::user())->findOrFail((int) $ticketId);
        $board = KanbanBoardModel::query()->with(['statuses', 'owner:id,name,email'])->findOrFail((int) $boardId);
        $oldBoardName = $ticket->board?->name ?? 'No board';

        $this->authorize('update', $ticket);

        if (! $board->statuses->contains('id', $ticket->status_id)) {
            $firstStatus = $board->statuses->first();

            if ($firstStatus !== null) {
                $ticket->status_id = $firstStatus->id;
                $ticket->completed_at = $firstStatus->is_closed ? now() : null;
            } else {
                $this->addStatusToBoard($board->id, (int) $ticket->status_id);
            }
        }

        $ticket->forceFill([
            'board_id' => $board->id,
            'last_activity_at' => now(),
        ])->save();

        $fresh = $ticket->fresh(['owner', 'agent', 'status', 'priority', 'category', 'project', 'team', 'board']) ?? $ticket;
        $workflow->dispatch($fresh, 'ticket.updated', Auth::user());

        $message = 'Ticket '.$fresh->reference.' moved from '.$oldBoardName.' to '.$board->name.'.';
        session()->flash('success', $message);
        $this->dispatch('wms:toast', type: 'success', title: 'Board changed', message: $message);
    }

    /**
     * Render the Kanban board.
     */
    public function render(): View
    {
        $boards = KanbanBoardModel::query()
            ->with(['statuses', 'owner:id,name,email'])
            ->orderBy('sort_order')
            ->orderBy('name')
            ->get();

        $board = $boards->firstWhere('id', $this->board_id) ?? $boards->first();
        $statuses = $board?->statuses ?? collect();

        if ($statuses->isEmpty()) {
            $statuses = Status::query()->orderBy('sort_order')->orderBy('name')->get();
        }

        return view('helpdesk::livewire.kanban-board', [
            'boards' => $boards,
            'board' => $board,
            'statuses' => $statuses,
            'ticketsByStatus' => $this->ticketsByStatus(),
        ])->layout('layouts.app');
    }

    /**
     * Get visible tickets grouped by status for the active board only.
     *
     * @return array<int, Collection<int, Ticket>>
     */
    private function ticketsByStatus(): array
    {
        $board = $this->activeBoard();

        return Ticket::query()
            ->with(['owner', 'agent', 'status', 'priority', 'category', 'project', 'team', 'product', 'tags', 'checklistItems', 'board'])
            ->visibleTo(Auth::user())
            ->when($board !== null, fn ($query) => $query->where('board_id', $board->id))
            ->latest('last_activity_at')
            ->limit(300)
            ->get()
            ->groupBy('status_id')
            ->all();
    }

    /**
     * Resolve the current board from the selected board ID.
     */
    private function activeBoard(): ?KanbanBoardModel
    {
        if ($this->board_id !== null) {
            return KanbanBoardModel::query()->find((int) $this->board_id);
        }

        return KanbanBoardModel::query()
            ->where('is_default', true)
            ->orderBy('sort_order')
            ->first() ?: KanbanBoardModel::query()->orderBy('sort_order')->first();
    }

    /**
     * Attach a missing status to a board when a move requires it.
     */
    private function addStatusToBoard(int $boardId, int $statusId): void
    {
        DB::table('helpdesk_kanban_board_statuses')->updateOrInsert(
            ['board_id' => $boardId, 'status_id' => $statusId],
            ['sort_order' => 999, 'updated_at' => now(), 'created_at' => now()]
        );
    }
}