<?php

namespace App\Http\Controllers\Qr;

use App\Http\Controllers\Controller;
use App\Models\Transfer;
use App\Models\TransferDownloadEvent;
use App\Services\Afia\AfiaService;
use App\Services\Billing\BillingClient;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class AfiaController extends Controller
{
    public function chat(Request $request, AfiaService $afia): JsonResponse
    {
        $validated = $request->validate([
            'message' => ['required', 'string', 'max:2000'],
            'history' => ['nullable', 'array', 'max:20'],
            'history.*.role' => ['nullable', 'string'],
            'history.*.text' => ['nullable', 'string'],
        ]);

        if (! $afia->enabled()) {
            return response()->json(['message' => 'Afia is not available right now.'], 503);
        }

        try {
            $reply = $afia->chat(trim($validated['message']), $validated['history'] ?? [], $this->context());
        } catch (\Throwable $e) {
            report($e);

            return response()->json(['message' => 'Afia could not respond right now. Please try again.'], 502);
        }

        return response()->json(['reply' => $reply]);
    }

    /** @return array<string,mixed> */
    private function context(): array
    {
        $account = ladill_account();

        if (! $account) {
            return ['signed_in' => 'no'];
        }

        $active = Transfer::query()
            ->where('user_id', $account->id)
            ->where('status', Transfer::STATUS_ACTIVE);

        $storageBytes = (int) (clone $active)->sum('storage_bytes');
        $storageGb = round($storageBytes / (1024 * 1024 * 1024), 2);

        $transferIds = Transfer::query()
            ->where('user_id', $account->id)
            ->pluck('id');

        $ctx = [
            'signed_in' => 'yes',
            'active_transfers' => (clone $active)->count(),
            'storage_gb' => $storageGb,
            'downloads_30d' => TransferDownloadEvent::query()
                ->whereIn('transfer_id', $transferIds)
                ->where('downloaded_at', '>=', now()->subDays(30))
                ->count(),
            'expiring_within_7_days' => Transfer::query()
                ->where('user_id', $account->id)
                ->where('status', Transfer::STATUS_ACTIVE)
                ->whereNotNull('expires_at')
                ->whereBetween('expires_at', [now(), now()->addDays(7)])
                ->count(),
            'storage_price_per_gb_month_ghs' => number_format((float) config('transfer.price_per_gb_month', 1.0), 2),
        ];

        if ($account->public_id) {
            try {
                $ctx['wallet_balance_ghs'] = number_format(app(BillingClient::class)->balanceMinor((string) $account->public_id) / 100, 2);
            } catch (\Throwable) {
            }
        }

        $recent = Transfer::query()
            ->where('user_id', $account->id)
            ->where('status', Transfer::STATUS_ACTIVE)
            ->with('qrCode:id,short_code')
            ->latest()
            ->limit(3)
            ->get(['id', 'title', 'qr_code_id', 'download_count', 'expires_at']);

        if ($recent->isNotEmpty()) {
            $ctx['recent_transfers'] = $recent->map(fn (Transfer $transfer): string => sprintf(
                '%s (%s, %d downloads%s)',
                $transfer->title,
                $transfer->qrCode?->short_code ?? 'no QR',
                $transfer->download_count,
                $transfer->expires_at ? ', expires '.$transfer->expires_at->toDateString() : '',
            ))->implode('; ');
        }

        return $ctx;
    }
}