Make style, quality and internal response_format image generation parameters optional

Some OpenAI models (like `gpt-image-1`) either don't support these or
only support specific other values.

Related to https://github.com/etkecc/baibot/issues/40

src/agent/provider/openai/config.rs

@@ -149,13 +149,13 @@ pub struct ImageGenerationConfig {
     pub model_id: String,
 
     #[serde(default = "default_image_style")]
-    pub style: async_openai::types::ImageStyle,
+    pub style: Option<async_openai::types::ImageStyle>,
 
     #[serde(default = "default_image_size")]
     pub size: async_openai::types::ImageSize,
 
     #[serde(default = "default_image_quality")]
-    pub quality: async_openai::types::ImageQuality,
+    pub quality: Option<async_openai::types::ImageQuality>,
 }
 
 impl Default for ImageGenerationConfig {
@@ -181,14 +181,14 @@ impl ImageGenerationConfig {
     }
 }
 
-fn default_image_style() -> async_openai::types::ImageStyle {
+fn default_image_style() -> Option<async_openai::types::ImageStyle> {
-    async_openai::types::ImageStyle::Vivid
+    None
 }
 
 fn default_image_size() -> async_openai::types::ImageSize {
     async_openai::types::ImageSize::S1024x1024
 }
 
-fn default_image_quality() -> async_openai::types::ImageQuality {
+fn default_image_quality() -> Option<async_openai::types::ImageQuality> {
-    async_openai::types::ImageQuality::Standard
+    None
 }

src/agent/provider/openai/controller.rs

@@ -265,12 +265,15 @@ impl ControllerTrait for Controller {
         let quality = if params.cheaper_quality_switching_allowed {
             // Switch to a cheaper quality
             match &image_generation_config.quality {
-                async_openai::types::ImageQuality::Standard => {
+                Some(quality) => match quality {
-                    async_openai::types::ImageQuality::Standard
+                    async_openai::types::ImageQuality::Standard => {
-                }
+                        Some(async_openai::types::ImageQuality::Standard)
-                async_openai::types::ImageQuality::HD => {
+                    }
-                    async_openai::types::ImageQuality::Standard
+                    async_openai::types::ImageQuality::HD => {
+                        Some(async_openai::types::ImageQuality::Standard)
+                    }
                 }
+                None => None
             }
         } else {
             image_generation_config.quality.clone()
@@ -284,14 +287,34 @@ impl ControllerTrait for Controller {
             })
             .unwrap_or(image_generation_config.size);
 
-        let request = CreateImageRequestArgs::default()
+        let response_format = match model.clone() {
+            async_openai::types::ImageModel::DallE2 => Some(async_openai::types::ImageResponseFormat::B64Json),
+            async_openai::types::ImageModel::DallE3 => Some(async_openai::types::ImageResponseFormat::B64Json),
+            async_openai::types::ImageModel::Other(model_str) => match model_str.as_str() {
+                _ => Some(async_openai::types::ImageResponseFormat::B64Json),
+            },
+        };
+
+        let mut request_builder = CreateImageRequestArgs::default();
+
+        request_builder
             .model(model)
             .prompt(prompt.to_owned())
-            .response_format(async_openai::types::ImageResponseFormat::B64Json)
+            .size(size);
-            .size(size)
+
-            .style(image_generation_config.style.clone())
+        if let Some(response_format) = response_format {
-            .quality(quality)
+            request_builder.response_format(response_format);
-            .build()?;
+        }
+
+        if let Some(style) = &image_generation_config.style {
+            request_builder.style(style.clone());
+        }
+
+        if let Some(quality) = quality {
+            request_builder.quality(quality.clone());
+        }
+
+        let request = request_builder.build()?;
 
         tracing::trace!(
             ?prompt,

src/agent/provider/openai_compat/config.rs

@@ -230,15 +230,15 @@ impl TryInto<OpenAIImageGenerationConfig> for ImageGenerationConfig {
         };
 
         let style = if let Some(style) = &self.style {
-            convert_string_to_enum::<async_openai::types::ImageStyle>(style)?
+            Some(convert_string_to_enum::<async_openai::types::ImageStyle>(style)?)
         } else {
-            async_openai::types::ImageStyle::Vivid
+            None
         };
 
         let quality = if let Some(quality) = &self.quality {
-            convert_string_to_enum::<async_openai::types::ImageQuality>(quality)?
+            Some(convert_string_to_enum::<async_openai::types::ImageQuality>(quality)?)
         } else {
-            async_openai::types::ImageQuality::Standard
+            None
         };
 
         Ok(OpenAIImageGenerationConfig {