<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\FollowUp;
use App\Models\Task;
use App\Support\AccessControl;
use Carbon\Carbon;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Gate;

class CalendarController extends Controller
{
    public function index(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'from' => 'required|date',
            'to' => 'required|date|after_or_equal:from',
            'type' => 'nullable|string|in:task,follow_up',
        ]);

        $from = Carbon::parse($validated['from'])->startOfDay();
        $to = Carbon::parse($validated['to'])->endOfDay();
        abort_if($from->diffInDays($to) > 370, 422, 'بازه تقویم نمی‌تواند بیشتر از یک سال باشد.');

        $events = collect();
        $type = $validated['type'] ?? null;

        if ((! $type || $type === 'task') && Gate::allows('viewAny', Task::class)) {
            $tasks = Task::query()
                ->with(['assignee:id,name', 'taskable'])
                ->whereNotNull('due_at')
                ->whereBetween('due_at', [$from, $to]);
            AccessControl::scopeTasks($tasks, $request->user());
            $events->push(...$tasks->get()->map(fn (Task $task) => [
                'id' => "task-{$task->id}",
                'entity_id' => $task->id,
                'type' => 'task',
                'title' => $task->subject,
                'starts_at' => $task->due_at,
                'status' => is_object($task->status) ? $task->status->value : $task->status,
                'priority' => is_object($task->priority) ? $task->priority->value : $task->priority,
                'assignee' => $task->assignee?->only(['id', 'name']),
                'related' => $task->taskable ? [
                    'type' => class_basename($task->taskable_type),
                    'id' => $task->taskable_id,
                    'label' => $task->taskable->name ?? $task->taskable->title ?? $task->taskable->company ?? null,
                ] : null,
                'url' => "/tasks?task={$task->id}",
            ]));
        }

        if ((! $type || $type === 'follow_up') && Gate::allows('viewAny', FollowUp::class)) {
            $followUps = FollowUp::query()
                ->with(['lead:id,first_name,last_name,company', 'user:id,name'])
                ->whereBetween('scheduled_at', [$from, $to]);
            AccessControl::scopeFollowUps($followUps, $request->user());
            $events->push(...$followUps->get()->map(fn (FollowUp $followUp) => [
                'id' => "follow-up-{$followUp->id}",
                'entity_id' => $followUp->id,
                'type' => 'follow_up',
                'title' => $followUp->notes ?: 'پیگیری لید',
                'starts_at' => $followUp->scheduled_at,
                'status' => $followUp->status,
                'priority' => null,
                'assignee' => $followUp->user?->only(['id', 'name']),
                'related' => $followUp->lead ? [
                    'type' => 'Lead',
                    'id' => $followUp->lead_id,
                    'label' => $followUp->lead->company ?: trim("{$followUp->lead->first_name} {$followUp->lead->last_name}"),
                ] : null,
                'url' => "/follow-ups?follow_up={$followUp->id}",
            ]));
        }

        abort_if($events->isEmpty() && ! Gate::allows('viewAny', Task::class) && ! Gate::allows('viewAny', FollowUp::class), 403);

        return response()->json(['events' => $events->sortBy('starts_at')->values()]);
    }
}