Refactor types into separate files

src/types/common.rs

@@ -0,0 +1,41 @@
+use std::collections::HashMap;
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Content {
+    pub role: String,
+    pub parts: Option<Vec<Part>>,
+}
+
+impl Content {
+    pub fn get_text(&self) -> Option<String> {
+        self.parts.as_ref().map(|parts| {
+            parts
+                .iter()
+                .filter_map(|part| match part {
+                    Part::Text(text) => Some(text.clone()),
+                    _ => None,
+                })
+                .collect::<String>()
+        })
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum Part {
+    Text(String),
+    InlineData {
+        mime_type: String,
+        data: String,
+    },
+    FileData {
+        mime_type: String,
+        file_uri: String,
+    },
+    FunctionCall {
+        name: String,
+        args: HashMap<String, String>,
+    },
+}