import { serve } from "https://deno.land/std@0.168.0/http/server.ts";
import { createClient } from "https://esm.sh/@supabase/supabase-js@2";

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

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

  try {
    const { word } = await req.json();

    if (!word || typeof word !== 'string') {
      throw new Error('Palavra inválida');
    }

    // Criar cliente Supabase
    const supabaseClient = createClient(
      Deno.env.get('SUPABASE_URL') ?? '',
      Deno.env.get('SUPABASE_ANON_KEY') ?? ''
    );

    // Verificar se já existe áudio para esta palavra
    const { data: existingAudio } = await supabaseClient
      .from('phonics_word_audio')
      .select('audio_url')
      .eq('word', word.toLowerCase())
      .single();

    if (existingAudio?.audio_url) {
      return new Response(
        JSON.stringify({ audioUrl: existingAudio.audio_url }),
        { headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
      );
    }

    // Gerar novo áudio usando Text-to-Speech
    const response = await fetch('https://api.elevenlabs.io/v1/text-to-speech/21m00Tcm4TlvDq8ikWAM', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'xi-api-key': Deno.env.get('ELEVEN_LABS_API_KEY') ?? '',
      },
      body: JSON.stringify({
        text: word,
        model_id: "eleven_multilingual_v2",
        voice_settings: {
          stability: 0.75,
          similarity_boost: 0.75,
          style: 0.5,
          use_speaker_boost: true
        }
      }),
    });

    if (!response.ok) {
      throw new Error('Erro ao gerar áudio');
    }

    const audioBuffer = await response.arrayBuffer();
    const audioBase64 = btoa(String.fromCharCode(...new Uint8Array(audioBuffer)));

    // Salvar áudio no storage
    const fileName = `${word.toLowerCase()}_${Date.now()}.mp3`;
    const { error: uploadError } = await supabaseClient.storage
      .from('phonics-audio')
      .upload(fileName, audioBuffer, {
        contentType: 'audio/mpeg',
        cacheControl: '31536000', // 1 ano
      });

    if (uploadError) {
      throw uploadError;
    }

    // Obter URL pública
    const { data: { publicUrl } } = supabaseClient.storage
      .from('phonics-audio')
      .getPublicUrl(fileName);

    // Salvar referência no banco
    await supabaseClient
      .from('phonics_word_audio')
      .insert({
        word: word.toLowerCase(),
        audio_url: publicUrl,
        audio_path: fileName,
      });

    return new Response(
      JSON.stringify({ audioUrl: publicUrl }),
      { headers: { ...corsHeaders, 'Content-Type': 'application/json' } }
    );

  } catch (error) {
    console.error('Error:', error);
    return new Response(
      JSON.stringify({ error: error.message }),
      { 
        status: 400,
        headers: { ...corsHeaders, 'Content-Type': 'application/json' }
      }
    );
  }
});