chore: Improve debugging and fix openai json response format

Author: tjtanjin

src/providers/GeminiProvider.ts

@@ -74,6 +74,10 @@ class GeminiProvider implements Provider {
 			body: JSON.stringify(this.constructBodyWithMessages(messages)),
 		});
 
+		if (this.debug) {
+			console.log('[GeminiProvider] Response status:', res.status);
+		}
+
 		if (!res.ok) {
 			throw new Error(`Gemini API error ${res.status}: ${await res.text()}`);
 		}
@@ -88,6 +92,9 @@ class GeminiProvider implements Provider {
 			}
 		} else {
 			const payload = await res.json();
+			if (this.debug) {
+				console.log('[GeminiProvider] Response body:', payload);
+			}
 			const text = payload.candidates?.[0]?.content?.parts?.[0]?.text;
 			if (typeof text === 'string') {
 				yield text;

src/providers/OpenaiProvider.ts

@@ -72,6 +72,10 @@ class OpenaiProvider implements Provider {
 			body: JSON.stringify(this.constructBodyWithMessages(messages)),
 		});
 
+		if (this.debug) {
+			console.log('[OpenaiProvider] Response status:', res.status);
+		}
+
 		if (!res.ok) {
 			throw new Error(`Openai API error ${res.status}: ${await res.text()}`);
 		}
@@ -86,7 +90,10 @@ class OpenaiProvider implements Provider {
 			}
 		} else {
 			const payload = await res.json();
-			const text = payload.candidates?.[0]?.content?.parts?.[0]?.text;
+			if (this.debug) {
+				console.log('[OpenaiProvider] Response body:', payload);
+			}
+			const text = payload.choices?.[0]?.message?.content;
 			if (typeof text === 'string') {
 				yield text;
 			} else {

src/providers/WebLlmProvider.ts

@@ -66,6 +66,11 @@ class WebLlmProvider implements Provider {
 		}
 
 		const result = await this.engine?.chat.completions.create(this.constructBodyWithMessages(messages));
+
+		if (this.debug) {
+			console.log('[WebLlmProvider] Response:', result);
+		}
+
 		if (result && Symbol.asyncIterator in result) {
 			for await (const chunk of result as AsyncIterable<ChatCompletionChunk>) {
 				const delta = chunk.choices[0]?.delta?.content;