<?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\Support\Facades\Schema;
use Illuminate\Validation\Rule;
use Modules\Helpdesk\Models\Status;
use Modules\Helpdesk\Models\Ticket;
use Modules\Helpdesk\Services\SlaService;
use Modules\Helpdesk\Services\WorkflowNotificationService;

final class TicketControlsController extends Controller
{
    /**
     * Persist the assigned agent from the ticket detail controls.
     */
    public function updateAgent(Request $request, Ticket $ticket, WorkflowNotificationService $workflow): RedirectResponse
    {
        $ticket->loadMissing($this->ticketActionRelations());

        Gate::authorize('update', $ticket);

        $validated = $request->validate([
            'agent_id' => [
                'nullable',
                'integer',
                Rule::exists('users', 'id')->where(function ($query) use ($ticket): void {
                    if ($ticket->company_id !== null && Schema::hasColumn('users', 'company_id')) {
                        $query->where(function ($query) use ($ticket): void {
                            $query->where('company_id', $ticket->company_id)
                                ->orWhereNull('company_id');
                        });
                    }
                }),
            ],
        ]);

        $agentId = $this->nullableInt($validated['agent_id'] ?? null);

        $this->updateTicket($ticket, [
            'agent_id' => $agentId,
            'last_activity_at' => now(),
        ]);

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

        return redirect()
            ->route('helpdesk.tickets.show', $fresh)
            ->with('ticket-action-updated', $agentId === null
                ? 'Ticket is now unassigned.'
                : 'Ticket assigned to '.($fresh->agent?->name ?? 'selected agent').'.');
    }

    /**
     * Persist the selected ticket status from the ticket detail controls.
     */
    public function updateStatus(Request $request, Ticket $ticket, WorkflowNotificationService $workflow, SlaService $sla): RedirectResponse
    {
        $ticket->loadMissing($this->ticketActionRelations());

        Gate::authorize('update', $ticket);

        $validated = $request->validate([
            'status_id' => ['required', 'integer', Rule::exists('helpdesk_statuses', 'id')],
        ]);

        $status = Status::query()->findOrFail((int) $validated['status_id']);

        $this->updateTicket($ticket, [
            'status_id' => $status->id,
            'completed_at' => $status->is_closed ? now() : null,
            'last_activity_at' => now(),
        ]);

        $this->ensureBoardContainsStatus($ticket, (int) $status->id);

        $fresh = $ticket->fresh(['agent', 'owner', 'status', 'priority', 'category', 'project', 'team', 'product']) ?? $ticket;

        if ($status->is_closed) {
            $sla->recordClosure($fresh);
        }

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

        return redirect()
            ->route('helpdesk.tickets.show', $fresh)
            ->with('ticket-action-updated', 'Status updated to '.($fresh->status?->name ?? 'selected status').'.');
    }

    /**
     * Persist the selected ticket priority from the ticket detail controls.
     */
    public function updatePriority(Request $request, Ticket $ticket, WorkflowNotificationService $workflow): RedirectResponse
    {
        $ticket->loadMissing($this->ticketActionRelations());

        Gate::authorize('update', $ticket);

        $validated = $request->validate([
            'priority_id' => ['required', 'integer', Rule::exists('helpdesk_priorities', 'id')],
        ]);

        $this->updateTicket($ticket, [
            'priority_id' => (int) $validated['priority_id'],
            'last_activity_at' => now(),
        ]);

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

        return redirect()
            ->route('helpdesk.tickets.show', $fresh)
            ->with('ticket-action-updated', 'Priority updated to '.($fresh->priority?->name ?? 'selected priority').'.');
    }

    /**
     * Relations needed by policies, redirect messages, and workflow templates.
     *
     * @return list<string>
     */
    private function ticketActionRelations(): array
    {
        return [
            'owner.company',
            'agent.company',
            'status',
            'priority',
            'category',
            'project',
            'team',
            'product',
        ];
    }

    /**
     * Apply a direct guarded ticket update without relying on Livewire hydration.
     *
     * @param array<string, mixed> $updates
     */
    private function updateTicket(Ticket $ticket, array $updates): void
    {
        if (Schema::hasColumn('helpdesk_tickets', 'updated_at')) {
            $updates['updated_at'] = now();
        }

        DB::table('helpdesk_tickets')
            ->where('id', $ticket->id)
            ->update($updates);
    }

    /**
     * Keep the active Kanban board usable when a ticket is moved to a status not yet assigned to the board.
     */
    private function ensureBoardContainsStatus(Ticket $ticket, int $statusId): void
    {
        if ($ticket->board_id === null || ! Schema::hasTable('helpdesk_kanban_board_statuses')) {
            return;
        }

        DB::table('helpdesk_kanban_board_statuses')->updateOrInsert(
            ['board_id' => $ticket->board_id, 'status_id' => $statusId],
            ['updated_at' => now(), 'created_at' => now()],
        );
    }

    /**
     * Convert form select values to nullable integers.
     */
    private function nullableInt(mixed $value): ?int
    {
        if ($value === null || $value === '' || $value === '0' || $value === 0) {
            return null;
        }

        return (int) $value;
    }
}