refactor(prompt): extract file path logic and implement auto-import on first launch (#214)

- Extract prompt file path logic to dedicated prompt_files module
- Refactor PromptService to use centralized path resolution
- Implement auto-import for existing prompt files on first startup
- Add comprehensive unit tests for auto-import functionality

src-tauri/src/app_config.rs

@@ -41,6 +41,7 @@ pub struct PromptRoot {
 
 use crate::config::{copy_file, get_app_config_dir, get_app_config_path, write_json_file};
 use crate::error::AppError;
+use crate::prompt_files::prompt_file_path;
 use crate::provider::ProviderManager;
 
 /// 应用类型
@@ -122,8 +123,12 @@ impl MultiAppConfig {
         let config_path = get_app_config_path();
 
         if !config_path.exists() {
-            log::info!("配置文件不存在，创建新的多应用配置");
-            return Ok(Self::default());
+            log::info!("配置文件不存在，创建新的多应用配置并自动导入提示词");
+            // 使用新的方法，支持自动导入提示词
+            let config = Self::default_with_auto_import()?;
+            // 立即保存到磁盘
+            config.save()?;
+            return Ok(config);
         }
 
         // 尝试读取文件
@@ -213,4 +218,253 @@ impl MultiAppConfig {
             AppType::Gemini => &mut self.mcp.gemini,
         }
     }
+
+    /// 创建默认配置并自动导入已存在的提示词文件
+    fn default_with_auto_import() -> Result<Self, AppError> {
+        log::info!("首次启动，创建默认配置并检测提示词文件");
+        
+        let mut config = Self::default();
+        
+        // 为每个应用尝试自动导入提示词
+        Self::auto_import_prompt_if_exists(&mut config, AppType::Claude)?;
+        Self::auto_import_prompt_if_exists(&mut config, AppType::Codex)?;
+        Self::auto_import_prompt_if_exists(&mut config, AppType::Gemini)?;
+        
+        Ok(config)
+    }
+
+    /// 检查并自动导入单个应用的提示词文件
+    fn auto_import_prompt_if_exists(
+        config: &mut Self,
+        app: AppType,
+    ) -> Result<(), AppError> {
+        let file_path = prompt_file_path(&app)?;
+        
+        // 检查文件是否存在
+        if !file_path.exists() {
+            log::debug!("提示词文件不存在，跳过自动导入: {file_path:?}");
+            return Ok(());
+        }
+
+        // 读取文件内容
+        let content = match std::fs::read_to_string(&file_path) {
+            Ok(c) => c,
+            Err(e) => {
+                log::warn!("读取提示词文件失败: {file_path:?}, 错误: {e}");
+                return Ok(()); // 失败时不中断，继续处理其他应用
+            }
+        };
+
+        // 检查内容是否为空
+        if content.trim().is_empty() {
+            log::debug!("提示词文件内容为空，跳过导入: {file_path:?}");
+            return Ok(());
+        }
+
+        log::info!("发现提示词文件，自动导入: {file_path:?}");
+
+        // 创建提示词对象
+        let timestamp = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .unwrap()
+            .as_secs() as i64;
+
+        let id = format!("auto-imported-{timestamp}");
+        let prompt = crate::prompt::Prompt {
+            id: id.clone(),
+            name: format!(
+                "初始提示词 {}",
+                chrono::Local::now().format("%Y-%m-%d %H:%M")
+            ),
+            content,
+            description: Some("首次启动时自动导入".to_string()),
+            enabled: true, // 自动启用
+            created_at: Some(timestamp),
+            updated_at: Some(timestamp),
+        };
+        
+        // 插入到对应的应用配置中
+        let prompts = match app {
+            AppType::Claude => &mut config.prompts.claude.prompts,
+            AppType::Codex => &mut config.prompts.codex.prompts,
+            AppType::Gemini => &mut config.prompts.gemini.prompts,
+        };
+        
+        prompts.insert(id, prompt);
+        
+        log::info!("自动导入完成: {}", app.as_str());
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serial_test::serial;
+    use std::env;
+    use std::fs;
+    use tempfile::TempDir;
+
+    struct TempHome {
+        dir: TempDir,
+        original_home: Option<String>,
+        original_userprofile: Option<String>,
+    }
+
+    impl TempHome {
+        fn new() -> Self {
+            let dir = TempDir::new().expect("failed to create temp home");
+            let original_home = env::var("HOME").ok();
+            let original_userprofile = env::var("USERPROFILE").ok();
+
+            env::set_var("HOME", dir.path());
+            env::set_var("USERPROFILE", dir.path());
+
+            Self {
+                dir,
+                original_home,
+                original_userprofile,
+            }
+        }
+    }
+
+    impl Drop for TempHome {
+        fn drop(&mut self) {
+            match &self.original_home {
+                Some(value) => env::set_var("HOME", value),
+                None => env::remove_var("HOME"),
+            }
+
+            match &self.original_userprofile {
+                Some(value) => env::set_var("USERPROFILE", value),
+                None => env::remove_var("USERPROFILE"),
+            }
+        }
+    }
+
+    fn write_prompt_file(app: AppType, content: &str) {
+        let path = crate::prompt_files::prompt_file_path(&app).expect("prompt path");
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent).expect("create parent dir");
+        }
+        fs::write(path, content).expect("write prompt");
+    }
+
+    #[test]
+    #[serial]
+    fn auto_imports_existing_prompt_when_config_missing() {
+        let _home = TempHome::new();
+        write_prompt_file(AppType::Claude, "# hello");
+
+        let config = MultiAppConfig::load().expect("load config");
+
+        assert_eq!(config.prompts.claude.prompts.len(), 1);
+        let prompt = config
+            .prompts
+            .claude
+            .prompts
+            .values()
+            .next()
+            .expect("prompt exists");
+        assert!(prompt.enabled);
+        assert_eq!(prompt.content, "# hello");
+
+        let config_path = crate::config::get_app_config_path();
+        assert!(
+            config_path.exists(),
+            "auto import should persist config to disk"
+        );
+    }
+
+    #[test]
+    #[serial]
+    fn skips_empty_prompt_files_during_import() {
+        let _home = TempHome::new();
+        write_prompt_file(AppType::Claude, "   \n  ");
+
+        let config = MultiAppConfig::load().expect("load config");
+        assert!(
+            config.prompts.claude.prompts.is_empty(),
+            "empty files must be ignored"
+        );
+    }
+
+    #[test]
+    #[serial]
+    fn auto_import_happens_only_once() {
+        let _home = TempHome::new();
+        write_prompt_file(AppType::Claude, "first version");
+
+        let first = MultiAppConfig::load().expect("load config");
+        assert_eq!(first.prompts.claude.prompts.len(), 1);
+        let claude_prompt = first
+            .prompts
+            .claude
+            .prompts
+            .values()
+            .next()
+            .expect("prompt exists")
+            .content
+            .clone();
+        assert_eq!(claude_prompt, "first version");
+
+        // 覆盖文件内容，但保留 config.json
+        write_prompt_file(AppType::Claude, "second version");
+        let second = MultiAppConfig::load().expect("load config again");
+
+        assert_eq!(second.prompts.claude.prompts.len(), 1);
+        let prompt = second
+            .prompts
+            .claude
+            .prompts
+            .values()
+            .next()
+            .expect("prompt exists");
+        assert_eq!(
+            prompt.content, "first version",
+            "should not re-import when config already exists"
+        );
+    }
+
+    #[test]
+    #[serial]
+    fn auto_imports_gemini_prompt_on_first_launch() {
+        let _home = TempHome::new();
+        write_prompt_file(AppType::Gemini, "# Gemini Prompt\n\nTest content");
+
+        let config = MultiAppConfig::load().expect("load config");
+
+        assert_eq!(config.prompts.gemini.prompts.len(), 1);
+        let prompt = config
+            .prompts
+            .gemini
+            .prompts
+            .values()
+            .next()
+            .expect("gemini prompt exists");
+        assert!(prompt.enabled, "gemini prompt should be enabled");
+        assert_eq!(prompt.content, "# Gemini Prompt\n\nTest content");
+        assert_eq!(prompt.description, Some("首次启动时自动导入".to_string()));
+    }
+
+    #[test]
+    #[serial]
+    fn auto_imports_all_three_apps_prompts() {
+        let _home = TempHome::new();
+        write_prompt_file(AppType::Claude, "# Claude prompt");
+        write_prompt_file(AppType::Codex, "# Codex prompt");
+        write_prompt_file(AppType::Gemini, "# Gemini prompt");
+
+        let config = MultiAppConfig::load().expect("load config");
+
+        // 验证所有三个应用的提示词都被导入
+        assert_eq!(config.prompts.claude.prompts.len(), 1);
+        assert_eq!(config.prompts.codex.prompts.len(), 1);
+        assert_eq!(config.prompts.gemini.prompts.len(), 1);
+
+        // 验证所有提示词都被启用
+        assert!(config.prompts.claude.prompts.values().next().unwrap().enabled);
+        assert!(config.prompts.codex.prompts.values().next().unwrap().enabled);
+        assert!(config.prompts.gemini.prompts.values().next().unwrap().enabled);
+    }
 }