<?php

namespace App\Console\Commands;

use App\Models\ClientProjectActivities;
use Carbon\Carbon;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;

class PendingProjectActivitiesNotify extends Command
{
    protected $signature = 'project-activities:pending-notify {--test-email= : Send a sample reminder email to this address only}';

    protected $description = 'Notify users about pending project activities based on estimated completion date';

    public function handle(): int
    {
        try {
            if ($this->option('test-email')) {
                return $this->sendTestEmail($this->option('test-email'));
            }

            $today = Carbon::today();
            $tomorrow = Carbon::tomorrow();

            $activities = ClientProjectActivities::query()
                ->with(['client:id,name,customer_id', 'user:id,name,email'])
                ->whereNull('completed_at')
                ->whereNotNull('estimated_completed_at')
                ->whereDate('estimated_completed_at', '<=', $tomorrow)
                ->orderBy('estimated_completed_at')
                ->get();

            $activities
                ->groupBy('user_id')
                ->each(function ($userActivities, $userId) use ($today, $tomorrow) {
                    $user = $userActivities->first()->user;

                    if (! $user || empty($user->email)) {
                        $this->warn("Skipping project activity reminder for user_id={$userId}; no valid email found.");

                        return;
                    }

                    $overdue = $userActivities->filter(function (ClientProjectActivities $activity) use ($today) {
                        return $activity->estimated_completed_at->lt($today);
                    });

                    $dueToday = $userActivities->filter(function (ClientProjectActivities $activity) use ($today) {
                        return $activity->estimated_completed_at->isSameDay($today);
                    });

                    $dueTomorrow = $userActivities->filter(function (ClientProjectActivities $activity) use ($tomorrow) {
                        return $activity->estimated_completed_at->isSameDay($tomorrow);
                    });

                    if ($overdue->isEmpty() && $dueToday->isEmpty()) {
                        return;
                    }

                    $mailData = [
                        'user_name' => $user->name,
                        'role_label' => 'Activity Owner',
                        'overdue' => $overdue->map(fn (ClientProjectActivities $activity) => $this->formatActivity($activity, $today))->values()->all(),
                        'due_today' => $dueToday->map(fn (ClientProjectActivities $activity) => $this->formatActivity($activity, $today))->values()->all(),
                        'due_tomorrow' => $dueTomorrow->map(fn (ClientProjectActivities $activity) => $this->formatActivity($activity, $today))->values()->all(),
                    ];

                    Mail::send('mail.project_activity_reminder', ['data' => $mailData], function ($message) use ($user) {
                        $message->to($user->email, $user->name)
                            ->subject('Pending Project Activity Reminder');
                    });

                    $this->info("Sent pending project activity reminder to {$user->email} ({$user->name}).");
                });

            return self::SUCCESS;
        } catch (\Throwable $e) {
            Log::error('Error sending pending project activity reminders: '.$e->getMessage(), [
                'trace' => $e->getTraceAsString(),
            ]);

            $this->error('Failed to send pending project activity reminders.');

            return self::FAILURE;
        }
    }

    private function formatActivity(ClientProjectActivities $activity, Carbon $today): array
    {
        $estimatedDate = $activity->estimated_completed_at->copy()->startOfDay();

        return [
            'activity_no' => $activity->activity_no,
            'customer_id' => $activity->client?->customer_id ?? '-',
            'customer' => $activity->client?->name ?? '-',
            'activity_type' => $activity->activity_type ?? '-',
            'task_description' => $activity->task_description ?? '-',
            'estimated_completed_at' => $estimatedDate->format('Y-m-d'),
            'number_of_days' => (int) $today->diffInDays($estimatedDate, false),
        ];
    }

    private function sendTestEmail(string $email): int
    {
        $today = Carbon::today();

        $mailData = [
            'user_name' => 'Brian',
            'role_label' => 'Activity Owner',
            'overdue' => [
                [
                    'activity_no' => 'ACT0001',
                    'customer_id' => '1234567890',
                    'customer' => 'Example Client A',
                    'activity_type' => 'scheduled',
                    'task_description' => 'Review SEM performance report and update client notes.',
                    'estimated_completed_at' => $today->copy()->subDays(2)->format('Y-m-d'),
                    'number_of_days' => -2,
                ],
            ],
            'due_today' => [
                [
                    'activity_no' => 'ACT0002',
                    'customer_id' => '1234567891',
                    'customer' => 'Example Client B',
                    'activity_type' => 'scheduled',
                    'task_description' => 'Prepare optimisation checklist for campaign review.',
                    'estimated_completed_at' => $today->format('Y-m-d'),
                    'number_of_days' => 0,
                ],
            ],
            'due_tomorrow' => [
                [
                    'activity_no' => 'ACT0003',
                    'customer_id' => '1234567892',
                    'customer' => 'Example Client C',
                    'activity_type' => 'scheduled',
                    'task_description' => 'Follow up on budget pacing and next-month planning.',
                    'estimated_completed_at' => $today->copy()->addDay()->format('Y-m-d'),
                    'number_of_days' => 1,
                ],
            ],
        ];

        Mail::send('mail.project_activity_reminder', ['data' => $mailData], function ($message) use ($email) {
            $message->to($email)
                ->subject('Test: Pending Project Activity Reminder');
        });

        $this->info("Sent test pending project activity reminder to {$email}.");

        return self::SUCCESS;
    }
}