<?php

namespace App\Jobs;

use App\Models\Activity;
use App\Models\Campaign;
use App\Models\CampaignRecipient;
use App\Models\User;
use App\Services\Campaigns\CampaignBillingService;
use App\Services\Campaigns\CampaignMessageService;
use App\Services\Campaigns\CampaignPricingService;
use App\Services\Comms\EmailService;
use App\Services\Comms\SmsService;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Queue\Queueable;
use Illuminate\Support\Facades\DB;

/**
 * Campaign delivery job — orphaned until Campaign / CampaignRecipient models exist.
 * Wire to CustomerSmsClient / CustomerEmailClient + MessagingCredentialsService when campaigns ship.
 */
class SendCampaignMessageJob implements ShouldQueue
{
    use Queueable;

    public function __construct(public int $recipientId)
    {
    }

    public function handle(
        EmailService $email,
        SmsService $sms,
        CampaignPricingService $pricing,
        CampaignBillingService $billing,
        CampaignMessageService $messages,
    ): void {
        $recipient = CampaignRecipient::query()->with('campaign')->find($this->recipientId);

        if (! $recipient || ! $recipient->campaign || $recipient->status !== CampaignRecipient::STATUS_PENDING) {
            return;
        }

        $campaign = $recipient->campaign;

        if (! in_array($campaign->status, [Campaign::STATUS_QUEUED, Campaign::STATUS_SENDING], true)) {
            return;
        }

        $body = $messages->personalize($campaign->body, $recipient->recipient_name);
        $subject = $messages->personalize((string) ($campaign->subject ?? ''), $recipient->recipient_name);
        $costMinor = $pricing->recipientCostMinor($campaign, $campaign->body);

        if (! $billing->canAfford($campaign->owner_ref, $costMinor)) {
            $this->markRecipient($recipient, CampaignRecipient::STATUS_SKIPPED, 0, 'Insufficient wallet balance.');

            return;
        }

        $sent = $campaign->channel === Campaign::CHANNEL_SMS
            ? $sms->send((string) $recipient->recipient_phone, $body)
            : $email->send(
                (string) $recipient->recipient_email,
                $subject !== '' ? $subject : 'Message from '.config('app.name'),
                $body,
                $this->senderName($campaign),
                $this->senderEmail($campaign),
            );

        if (! $sent) {
            $this->markRecipient($recipient, CampaignRecipient::STATUS_FAILED, 0, 'Delivery could not be confirmed.');

            return;
        }

        $charged = $billing->charge(
            $campaign->owner_ref,
            $costMinor,
            $campaign->channel,
            $campaign->id,
            $recipient->id,
            'CRM campaign "'.$campaign->name.'" to '.$recipient->recipient_name,
        );

        $this->markRecipient(
            $recipient,
            CampaignRecipient::STATUS_SENT,
            $charged ? $costMinor : 0,
            null,
            now(),
        );

        $this->logActivity($campaign, $recipient, $subject, $body);
    }

    private function markRecipient(
        CampaignRecipient $recipient,
        string $status,
        int $costMinor,
        ?string $error,
        ?\DateTimeInterface $sentAt = null,
    ): void {
        $recipient->forceFill([
            'status' => $status,
            'cost_minor' => $costMinor,
            'error_message' => $error,
            'sent_at' => $sentAt,
        ])->save();

        $this->refreshCampaignCounters($recipient->campaign()->first());
    }

    private function refreshCampaignCounters(?Campaign $campaign): void
    {
        if (! $campaign) {
            return;
        }

        DB::transaction(function () use ($campaign) {
            $campaign = Campaign::query()->lockForUpdate()->find($campaign->id);

            if (! $campaign) {
                return;
            }

            $counts = $campaign->recipients()
                ->selectRaw("
                    SUM(CASE WHEN status = ? THEN 1 ELSE 0 END) as sent_count,
                    SUM(CASE WHEN status = ? THEN 1 ELSE 0 END) as failed_count,
                    SUM(CASE WHEN status = ? THEN 1 ELSE 0 END) as skipped_count,
                    SUM(cost_minor) as actual_cost_minor
                ", [
                    CampaignRecipient::STATUS_SENT,
                    CampaignRecipient::STATUS_FAILED,
                    CampaignRecipient::STATUS_SKIPPED,
                ])
                ->first();

            $pending = $campaign->recipients()->where('status', CampaignRecipient::STATUS_PENDING)->count();

            $campaign->forceFill([
                'sent_count' => (int) ($counts->sent_count ?? 0),
                'failed_count' => (int) ($counts->failed_count ?? 0),
                'skipped_count' => (int) ($counts->skipped_count ?? 0),
                'actual_cost_minor' => (int) ($counts->actual_cost_minor ?? 0),
            ]);

            if ($pending === 0 && in_array($campaign->status, [Campaign::STATUS_QUEUED, Campaign::STATUS_SENDING], true)) {
                $campaign->status = Campaign::STATUS_COMPLETED;
                $campaign->completed_at = now();
            } elseif ($campaign->status === Campaign::STATUS_QUEUED) {
                $campaign->status = Campaign::STATUS_SENDING;
            }

            $campaign->save();
        });
    }

    private function logActivity(Campaign $campaign, CampaignRecipient $recipient, string $subject, string $body): void
    {
        $title = $campaign->channel === Campaign::CHANNEL_SMS
            ? 'Campaign SMS: '.$campaign->name
            : 'Campaign email: '.($subject !== '' ? $subject : $campaign->name);

        $payload = [
            'owner_ref' => $campaign->owner_ref,
            'type' => $campaign->channel,
            'direction' => 'out',
            'title' => $title,
            'body' => $body,
            'completed_at' => now(),
        ];

        if ($recipient->customer_id) {
            Activity::create([
                ...$payload,
                'subject_type' => 'contact',
                'subject_id' => $recipient->customer_id,
            ]);
        }

        if ($recipient->lead_id) {
            Activity::create([
                ...$payload,
                'subject_type' => 'lead',
                'subject_id' => $recipient->lead_id,
            ]);
        }
    }

    private function senderName(Campaign $campaign): ?string
    {
        return User::query()->where('public_id', $campaign->owner_ref)->value('name');
    }

    private function senderEmail(Campaign $campaign): ?string
    {
        return User::query()->where('public_id', $campaign->owner_ref)->value('email');
    }
}