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',
};

interface AudioUrlRequest {
	textId: string;
	chunkId: string;
}

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

	try {
		// Initialize Supabase client
		const supabaseClient = createClient(
			Deno.env.get('SUPABASE_URL') ?? '',
			Deno.env.get('SUPABASE_ANON_KEY') ?? '',
			{
				global: {
					headers: { Authorization: req.headers.get('Authorization')! },
				},
			}
		);

		// Get user from JWT token
		const {
			data: { user },
		} = await supabaseClient.auth.getUser();

		if (!user) {
			return new Response(JSON.stringify({ error: 'Unauthorized' }), {
				status: 401,
				headers: { ...corsHeaders, 'Content-Type': 'application/json' },
			});
		}

		const { textId, chunkId }: AudioUrlRequest = await req.json();

		// Validate input
		if (!textId || !chunkId) {
			return new Response(JSON.stringify({ error: 'Missing required fields' }), {
				status: 400,
				headers: { ...corsHeaders, 'Content-Type': 'application/json' },
			});
		}

		// Verify text belongs to user
		const { data: text, error: textError } = await supabaseClient
			.from('texts')
			.select('data')
			.eq('id', textId)
			.eq('user_id', user.id)
			.single();

		if (textError || !text) {
			return new Response(JSON.stringify({ error: 'Text not found' }), {
				status: 404,
				headers: { ...corsHeaders, 'Content-Type': 'application/json' },
			});
		}

		// Find the chunk
		const chunk = text.data.audio?.chunks?.find((c: any) => c.id === chunkId);
		if (!chunk) {
			return new Response(JSON.stringify({ error: 'Chunk not found' }), {
				status: 404,
				headers: { ...corsHeaders, 'Content-Type': 'application/json' },
			});
		}

		// Generate signed URL for the audio file with user-specific path
		const filePath = `${user.id}/${textId}/${chunkId}.mp3`;
		const { data: urlData, error: urlError } = await supabaseClient.storage
			.from('audio')
			.createSignedUrl(filePath, 3600); // 1 hour expiration

		if (urlError) {
			throw urlError;
		}

		return new Response(
			JSON.stringify({
				success: true,
				url: urlData.signedUrl,
				chunk: {
					id: chunk.id,
					start: chunk.start,
					end: chunk.end,
					duration: chunk.duration,
				},
			}),
			{
				headers: { ...corsHeaders, 'Content-Type': 'application/json' },
			}
		);
	} catch (error) {
		console.error('Error in get-audio-url function:', error);
		return new Response(JSON.stringify({ error: error.message }), {
			status: 500,
			headers: { ...corsHeaders, 'Content-Type': 'application/json' },
		});
	}
});