<?php

namespace App\Services;

use App\Models\FollowUp;
use App\Models\Lead;
use App\Models\User;
use App\Support\WorkingHours;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class FollowUpService
{
    public function schedule(Lead $lead, int $assigneeId, string $scheduledAt, User $actor, ?string $notes = null, ?int $callId = null, string $source = 'manual'): FollowUp
    {
        if (! WorkingHours::followUpAllowed($scheduledAt)) {
            throw ValidationException::withMessages([
                'scheduled_at' => ['زمان پیگیری خارج از روز یا ساعت کاری مجاز است.'],
            ]);
        }

        $followUp = DB::transaction(function () use ($lead, $assigneeId, $scheduledAt, $actor, $notes, $callId, $source): FollowUp {
            $followUp = FollowUp::create([
                'lead_id' => $lead->id,
                'user_id' => $assigneeId,
                'created_by' => $actor->id,
                'call_id' => $callId,
                'source' => $source,
                'scheduled_at' => $scheduledAt,
                'notes' => $notes,
                'status' => 'pending',
            ]);

            $lead->update(['next_follow_up_at' => $scheduledAt]);
            ActivityLogger::log('follow_up_created', "Follow-up {$followUp->id} scheduled from {$source}", $followUp);

            return $followUp;
        });

        NotificationService::notifyFollowUpAssigned(
            $followUp,
            $lead->full_name ?: ($lead->company ?? "لید {$lead->id}"),
            $actor,
        );

        return $followUp->load($this->relations());
    }

    public function update(FollowUp $followUp, array $data): FollowUp
    {
        if (isset($data['scheduled_at']) && ! WorkingHours::followUpAllowed($data['scheduled_at'])) {
            throw ValidationException::withMessages([
                'scheduled_at' => ['زمان پیگیری خارج از روز یا ساعت کاری مجاز است.'],
            ]);
        }

        if (($data['status'] ?? null) === 'completed') {
            $data['completed_at'] = now();
            $data['is_overdue'] = false;
        } elseif (($data['status'] ?? null) === 'pending') {
            $data['completed_at'] = null;
        }

        $beforeAssignee = $followUp->user_id;
        $followUp->update($data);
        ActivityLogger::log('follow_up_updated', "Follow-up {$followUp->id} updated", $followUp);

        if (isset($data['user_id']) && (int) $data['user_id'] !== $beforeAssignee) {
            NotificationService::notifyFollowUpAssigned(
                $followUp->fresh(),
                $followUp->lead?->full_name ?: ($followUp->lead?->company ?? "لید {$followUp->lead_id}"),
                auth()->user(),
            );
        }

        return $followUp->fresh($this->relations());
    }

    private function relations(): array
    {
        return ['lead:id,first_name,last_name,company,phone', 'user:id,name', 'creator:id,name'];
    }
}