<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\ZaloBotService;
use App\Services\SettingService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

class ZaloWebhookController extends Controller
{
    protected ZaloBotService $zaloBotService;
    protected SettingService $settingService;

    public function __construct(
        ZaloBotService $zaloBotService,
        SettingService $settingService
    ) {
        $this->zaloBotService = $zaloBotService;
        $this->settingService = $settingService;
    }

    /**
     * Handle webhook request from Zalo Bot Platform.
     */
    public function handle(Request $request): JsonResponse
    {
        $configuredSecret = $this->settingService->get('zalo_webhook_secret');
        
        if (!empty($configuredSecret)) {
            $incomingSecret = $request->header('X-Bot-Api-Secret-Token') 
                ?? $request->header('x-bot-api-secret-token');

            if ($incomingSecret !== $configuredSecret) {
                return response()->json([
                    'ok' => false,
                    'error' => 'Unauthorized. Secret token mismatch.'
                ], 401);
            }
        }

        $payload = $request->all();
        
        // Pass payload to ZaloBotService
        $this->zaloBotService->handleWebhook($payload);

        return response()->json([
            'ok' => true,
        ]);
    }

    /**
     * Process a Shopee link for the Zalo user-bot (self-bot) and return the formatted reply.
     */
    public function processLink(Request $request): JsonResponse
    {
        $request->validate([
            'url' => 'required|string',
            'sender_name' => 'nullable|string',
            'thread_id' => 'nullable|string',
            'chat_name' => 'nullable|string'
        ]);

        $url = $request->input('url');
        $fromName = $request->input('sender_name') ?? 'Bạn';
        $threadId = $request->input('thread_id');
        $chatName = $request->input('chat_name');

        // 1. Add/Update this thread into discovered groups pool so Admin can whitelist it
        if ($threadId) {
            \App\Models\ZaloDiscoveredGroup::updateOrCreate(
                ['group_id' => $threadId],
                ['name' => $chatName ?: ($fromName ? "Chat với {$fromName}" : "Trò chuyện cá nhân")]
            );
        }

        // 2. Whitelist Filtering: Bot is ONLY allowed to respond to whitelisted threads (Default Deny)
        $isAllowed = \App\Models\ZaloChannel::where('thread_id', $threadId)
            ->where('is_allowed', true)
            ->exists();
            
        $productTitle = $request->input('product_title');
        $productImage = $request->input('product_image');

        if (!$isAllowed) {
            return response()->json([
                'success' => false,
                'error' => 'Thread is not whitelisted. Bot response restricted.'
            ], 403);
        }

        try {
            // 1. Resolve redirect if short link
            $resolvedUrl = $this->zaloBotService->resolveShortUrl($url);

            // 2. Convert link to short redirect affiliate link and log details
            $convertResult = app(\App\Services\LinkConverterService::class)->process(
                $resolvedUrl, 
                $threadId, 
                $chatName, 
                'zalo_bot', 
                null, 
                null, 
                $productTitle, 
                $productImage
            );

            if ($convertResult && $convertResult->isSuccess) {
                $shortLink = $convertResult->affiliateUrl;

                // Fetch the logged history to extract cào details
                $history = \App\Models\ConversionHistory::where('original_url', $resolvedUrl)
                    ->where('zalo_thread_id', $threadId)
                    ->latest()
                    ->first();

                $productName = $history && $history->product_title ? $history->product_title : ($productTitle ?: ($this->zaloBotService->extractProductName($resolvedUrl) ?? 'Sản phẩm Shopee'));

                // 3. Construct the message template
                $replyText = "Hi @{$fromName}, Link của bạn đây ạ:\n\n" .
                             "📦 Tên sản phẩm Shopee:\n{$productName}\n\n" .
                             "🔗 Link: {$shortLink}\n\n" .
                             "⚠️ Lưu ý: Để đơn hàng được ghi nhận, KHÔNG mua qua Livestream, KHÔNG xem video/live bất kỳ sau khi click & XÓA sản phẩm ra khỏi giỏ hàng TRƯỚC KHI bấm link!";

                return response()->json([
                    'success' => true,
                    'reply_text' => $replyText,
                    'short_link' => $shortLink
                ]);
            }

            return response()->json([
                'success' => false,
                'error' => $convertResult->errorMessage ?? 'Conversion failed'
            ], 400);

        } catch (\Exception $e) {
            return response()->json([
                'success' => false,
                'error' => $e->getMessage()
            ], 500);
        }
    }

    /**
     * Update Zalo user-bot (self-bot) status in settings table.
     */
    public function updateStatus(Request $request): JsonResponse
    {
        $request->validate([
            'status' => 'required|string',
            'user_name' => 'nullable|string'
        ]);

        $this->settingService->set('zalo_bot_status', $request->input('status'));
        
        if ($request->has('user_name')) {
            $this->settingService->set('zalo_bot_user', $request->input('user_name') ?? '');
        } else if ($request->input('status') === 'disconnected') {
            $this->settingService->set('zalo_bot_user', '');
        }
        
        return response()->json(['ok' => true]);
    }

    /**
     * Sync Zalo groups from userbot into discovered pool.
     */
    public function syncGroups(Request $request): JsonResponse
    {
        $request->validate([
            'groups' => 'required|array',
            'groups.*.id' => 'required|string',
            'groups.*.name' => 'nullable|string'
        ]);

        $groups = $request->input('groups');
        $fetchedIds = array_column($groups, 'id');

        // Delete groups no longer joined
        \App\Models\ZaloDiscoveredGroup::whereNotIn('group_id', $fetchedIds)->delete();

        // Update or insert current groups
        foreach ($groups as $group) {
            \App\Models\ZaloDiscoveredGroup::updateOrCreate(
                ['group_id' => $group['id']],
                ['name' => $group['name'] ?? 'Nhóm Zalo']
            );
        }

        return response()->json(['ok' => true]);
    }
}