import { serve } from "https://deno.land/std@0.190.0/http/server.ts";
import { createClient } from "https://esm.sh/@supabase/supabase-js@2.57.4";
import { Novu } from "npm:@novu/api@1.6.0";
import { edgeLogger, startRequest, endRequest } from "../_shared/logger.ts";

const corsHeaders = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Headers': 'authorization, x-client-info, apikey, content-type, x-request-id',
};

const TOPICS = {
  MODERATION_SUBMISSIONS: 'moderation-submissions',
  MODERATION_REPORTS: 'moderation-reports',
} as const;

serve(async (req) => {
  if (req.method === 'OPTIONS') {
    return new Response(null, { headers: corsHeaders });
  }

  const tracking = startRequest('manage-moderator-topic');

  try {
    const novuApiKey = Deno.env.get('NOVU_API_KEY');
    if (!novuApiKey) {
      throw new Error('NOVU_API_KEY is not configured');
    }

    const novu = new Novu({ secretKey: novuApiKey });

    const { userId, action } = await req.json();

    if (!userId || !action) {
      throw new Error('Missing required fields: userId, action');
    }

    if (action !== 'add' && action !== 'remove') {
      throw new Error('Action must be either "add" or "remove"');
    }

    edgeLogger.info(`${action === 'add' ? 'Adding' : 'Removing'} user ${userId} ${action === 'add' ? 'to' : 'from'} moderator topics`, { action: 'manage_moderator_topic', requestId: tracking.requestId, userId, operation: action });

    const topics = [TOPICS.MODERATION_SUBMISSIONS, TOPICS.MODERATION_REPORTS];
    const results = [];

    for (const topicKey of topics) {
      try {
        if (action === 'add') {
          // Add subscriber to topic
          await novu.topics.addSubscribers(topicKey, {
            subscribers: [userId],
          });
          edgeLogger.info('Added user to topic', { action: 'manage_moderator_topic', requestId: tracking.requestId, userId, topicKey });
          results.push({ topic: topicKey, action: 'added', success: true });
        } else {
          // Remove subscriber from topic
          await novu.topics.removeSubscribers(topicKey, {
            subscribers: [userId],
          });
          edgeLogger.info('Removed user from topic', { action: 'manage_moderator_topic', requestId: tracking.requestId, userId, topicKey });
          results.push({ topic: topicKey, action: 'removed', success: true });
        }
      } catch (error: any) {
        edgeLogger.error(`Error ${action}ing user ${userId} ${action === 'add' ? 'to' : 'from'} topic ${topicKey}`, { 
          action: 'manage_moderator_topic', 
          requestId: tracking.requestId, 
          userId, 
          topicKey, 
          error: error.message 
        });
        results.push({ 
          topic: topicKey, 
          action: action === 'add' ? 'added' : 'removed', 
          success: false, 
          error: error.message 
        });
      }
    }

    const allSuccess = results.every(r => r.success);

    endRequest(tracking, allSuccess ? 200 : 207);

    return new Response(
      JSON.stringify({
        success: allSuccess,
        userId,
        action,
        results,
        requestId: tracking.requestId
      }),
      {
        headers: { 
          ...corsHeaders, 
          'Content-Type': 'application/json',
          'X-Request-ID': tracking.requestId
        },
        status: allSuccess ? 200 : 207, // 207 = Multi-Status (partial success)
      }
    );
  } catch (error: any) {
    edgeLogger.error('Error managing moderator topic', { action: 'manage_moderator_topic', requestId: tracking.requestId, error: error.message });
    
    endRequest(tracking, 500, error.message);

    return new Response(
      JSON.stringify({
        success: false,
        error: error.message,
        requestId: tracking.requestId
      }),
      {
        headers: { 
          ...corsHeaders, 
          'Content-Type': 'application/json',
          'X-Request-ID': tracking.requestId
        },
        status: 500,
      }
    );
  }
});