<?php

namespace App\Services\Meet;

use App\Models\Organization;
use App\Models\Session;
use App\Models\UsageRecord;
use App\Services\Billing\BillingClient;
use Illuminate\Support\Facades\Log;

class UsageMeteringService
{
    public function __construct(
        protected BillingClient $billing,
        protected LicenseService $licenses,
    ) {}

    public function recordSessionUsage(Session $session): void
    {
        $room = $session->room;
        $organization = $room->organization;
        $minutes = $this->participantMinutes($session);

        UsageRecord::create([
            'owner_ref' => $session->owner_ref,
            'organization_id' => $organization->id,
            'branch_id' => $room->branch_id,
            'metric' => 'participant_minutes',
            'quantity' => $minutes,
            'metadata' => ['session_uuid' => $session->uuid, 'room_uuid' => $room->uuid],
            'recorded_at' => now(),
        ]);

        $this->maybeDebit($organization, $minutes, 'participant_minutes', $session->uuid);
    }

    public function recordRecordingStorage(Organization $organization, int $bytes, string $recordingUuid): void
    {
        UsageRecord::create([
            'owner_ref' => $organization->owner_ref,
            'organization_id' => $organization->id,
            'metric' => 'recording_storage_bytes',
            'quantity' => $bytes,
            'metadata' => ['recording_uuid' => $recordingUuid],
            'recorded_at' => now(),
        ]);
    }

    public function recordAiMinutes(Organization $organization, int $minutes, string $sessionUuid): void
    {
        UsageRecord::create([
            'owner_ref' => $organization->owner_ref,
            'organization_id' => $organization->id,
            'metric' => 'ai_minutes',
            'quantity' => $minutes,
            'metadata' => ['session_uuid' => $sessionUuid],
            'recorded_at' => now(),
        ]);

        $this->maybeDebit($organization, $minutes, 'ai_minutes', $sessionUuid);
    }

    public function usageSummary(Organization $organization, ?int $branchId = null, int $days = 30): array
    {
        $since = now()->subDays($days);
        $query = UsageRecord::where('organization_id', $organization->id)
            ->where('recorded_at', '>=', $since);

        if ($branchId) {
            $query->where('branch_id', $branchId);
        }

        return $query
            ->selectRaw('metric, SUM(quantity) as total')
            ->groupBy('metric')
            ->pluck('total', 'metric')
            ->all();
    }

    protected function participantMinutes(Session $session): int
    {
        if (! $session->started_at) {
            return 0;
        }

        $ended = $session->ended_at ?? now();
        $durationMinutes = max(1, (int) ceil($session->started_at->diffInSeconds($ended) / 60));
        $participants = max(1, $session->participants()->count());

        return $durationMinutes * $participants;
    }

    protected function maybeDebit(Organization $organization, int $quantity, string $metric, string $reference): void
    {
        $rates = config('meet.billing.rates', []);
        $rateMinor = (int) ($rates[$metric] ?? 0);
        if ($rateMinor <= 0) {
            return;
        }

        $amountMinor = $quantity * $rateMinor;

        try {
            $this->billing->debit(
                $organization->owner_ref,
                $amountMinor,
                'meet_'.$metric,
                'meet-usage-'.$reference,
                'Ladill Meet '.$metric,
            );
        } catch (\Throwable $e) {
            Log::warning('Meet usage billing debit failed', [
                'organization' => $organization->id,
                'metric' => $metric,
                'error' => $e->getMessage(),
            ]);
        }
    }
}