import { createClient } from 'https://esm.sh/@supabase/supabase-js@2.39.3';

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

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

  try {
    const supabaseUrl = Deno.env.get('SUPABASE_URL')!;
    const supabaseKey = Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!;
    const supabase = createClient(supabaseUrl, supabaseKey);

    console.log('Starting price check...');

    // Get all enabled alert profiles
    const { data: alertProfiles, error: profilesError } = await supabase
      .from('alert_profiles')
      .select('*')
      .eq('enabled', true);

    if (profilesError) {
      throw profilesError;
    }

    console.log(`Found ${alertProfiles?.length || 0} active alert profiles`);

    // Get all products
    const { data: products, error: productsError } = await supabase
      .from('products')
      .select('*');

    if (productsError) {
      throw productsError;
    }

    console.log(`Found ${products?.length || 0} products`);

    const alerts = [];

    // Check each alert profile against products
    for (const profile of alertProfiles || []) {
      for (const product of products || []) {
        // Match category
        if (product.category !== profile.category) continue;

        // Check if product meets specification requirements
        const specsFilter = profile.specs_filter;
        const productSpecs = product.specs;
        
        let meetsRequirements = true;

        // Check minimum size (for harddrives/ram)
        if (specsFilter.min_size) {
          const minSizeValue = parseFloat(specsFilter.min_size);
          const productSizeValue = parseFloat(productSpecs.size || '0');
          if (productSizeValue < minSizeValue) {
            meetsRequirements = false;
          }
        }

        // Check type (SSD/HDD/etc)
        if (specsFilter.type && productSpecs.type !== specsFilter.type) {
          meetsRequirements = false;
        }

        // Check if price is below target
        if (!meetsRequirements || product.current_price > profile.target_price) {
          continue;
        }

        // Found a match! Log the alert
        const message = `🎯 Alert: ${profile.name}\n` +
          `Product: ${product.name}\n` +
          `Price: ${product.current_price} ${product.currency}\n` +
          `Target: ${profile.target_price} ${product.currency}\n` +
          `Store: ${product.store}\n` +
          `URL: ${product.url}`;

        const { error: logError } = await supabase
          .from('alerts_log')
          .insert({
            alert_profile_id: profile.id,
            product_id: product.id,
            triggered_price: product.current_price,
            message,
            sent_to_discord: false
          });

        if (logError) {
          console.error('Error logging alert:', logError);
        }

        alerts.push({
          profile,
          product,
          message
        });

        // Send Discord notification if webhook URL is set
        if (profile.discord_webhook_url) {
          try {
            await fetch(profile.discord_webhook_url, {
              method: 'POST',
              headers: { 'Content-Type': 'application/json' },
              body: JSON.stringify({
                content: message,
                embeds: [{
                  title: '💰 Price Alert!',
                  description: message,
                  color: 0x00ff00,
                  fields: [
                    {
                      name: 'Current Price',
                      value: `${product.current_price} ${product.currency}`,
                      inline: true
                    },
                    {
                      name: 'Target Price',
                      value: `${profile.target_price} ${product.currency}`,
                      inline: true
                    },
                    {
                      name: 'Savings',
                      value: `${(profile.target_price - product.current_price).toFixed(2)} ${product.currency}`,
                      inline: true
                    }
                  ],
                  timestamp: new Date().toISOString()
                }]
              })
            });

            // Update log to mark as sent
            await supabase
              .from('alerts_log')
              .update({ sent_to_discord: true })
              .eq('alert_profile_id', profile.id)
              .eq('product_id', product.id);

            console.log(`Sent Discord notification for ${product.name}`);
          } catch (discordError) {
            console.error('Error sending Discord notification:', discordError);
          }
        }
      }
    }

    console.log(`Price check complete. Found ${alerts.length} matching alerts`);

    return new Response(
      JSON.stringify({
        success: true,
        alertsTriggered: alerts.length,
        alerts
      }),
      { headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    );

  } catch (error) {
    console.error('Error in check-prices function:', error);
    const errorMessage = error instanceof Error ? error.message : 'Unknown error occurred';
    return new Response(
      JSON.stringify({ error: errorMessage }),
      { 
        status: 500,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' }
      }
    );
  }
});