#![allow(non_snake_case)]

use crate::init_status::InitErrorPayload;
use tauri::AppHandle;
use tauri_plugin_opener::OpenerExt;

/// 打开外部链接
#[tauri::command]
pub async fn open_external(app: AppHandle, url: String) -> Result<bool, String> {
    let url = if url.starts_with("http://") || url.starts_with("https://") {
        url
    } else {
        format!("https://{url}")
    };

    app.opener()
        .open_url(&url, None::<String>)
        .map_err(|e| format!("打开链接失败: {e}"))?;

    Ok(true)
}

/// 检查更新
#[tauri::command]
pub async fn check_for_updates(handle: AppHandle) -> Result<bool, String> {
    handle
        .opener()
        .open_url(
            "https://github.com/farion1231/cc-switch/releases/latest",
            None::<String>,
        )
        .map_err(|e| format!("打开更新页面失败: {e}"))?;

    Ok(true)
}

/// 判断是否为便携版（绿色版）运行
#[tauri::command]
pub async fn is_portable_mode() -> Result<bool, String> {
    let exe_path = std::env::current_exe().map_err(|e| format!("获取可执行路径失败: {e}"))?;
    if let Some(dir) = exe_path.parent() {
        Ok(dir.join("portable.ini").is_file())
    } else {
        Ok(false)
    }
}

/// 获取应用启动阶段的初始化错误（若有）。
/// 用于前端在早期主动拉取，避免事件订阅竞态导致的提示缺失。
#[tauri::command]
pub async fn get_init_error() -> Result<Option<InitErrorPayload>, String> {
    Ok(crate::init_status::get_init_error())
}

/// 获取 JSON→SQLite 迁移结果（若有）。
/// 只返回一次 true，之后返回 false，用于前端显示一次性 Toast 通知。
#[tauri::command]
pub async fn get_migration_result() -> Result<bool, String> {
    Ok(crate::init_status::take_migration_success())
}

#[derive(serde::Serialize)]
pub struct ToolVersion {
    name: String,
    version: Option<String>,
    latest_version: Option<String>, // 新增字段：最新版本
    error: Option<String>,
}

#[tauri::command]
pub async fn get_tool_versions() -> Result<Vec<ToolVersion>, String> {
    let tools = vec!["claude", "codex", "gemini"];
    let mut results = Vec::new();

    // 用于获取远程版本的 client
    let client = reqwest::Client::builder()
        .user_agent("cc-switch/1.0")
        .build()
        .map_err(|e| e.to_string())?;

    for tool in tools {
        // 1. 获取本地版本 - 先尝试直接执行，失败则扫描常见路径
        let (local_version, local_error) = {
            // 先尝试直接执行
            let direct_result = try_get_version(tool);

            if direct_result.0.is_some() {
                direct_result
            } else {
                // 扫描常见的 npm 全局安装路径
                scan_cli_version(tool)
            }
        };

        // 2. 获取远程最新版本
        let latest_version = match tool {
            "claude" => fetch_npm_latest_version(&client, "@anthropic-ai/claude-code").await,
            "codex" => fetch_npm_latest_version(&client, "@openai/codex").await,
            "gemini" => fetch_npm_latest_version(&client, "@google/gemini-cli").await,
            _ => None,
        };

        results.push(ToolVersion {
            name: tool.to_string(),
            version: local_version,
            latest_version,
            error: local_error,
        });
    }

    Ok(results)
}

/// Helper function to fetch latest version from npm registry
async fn fetch_npm_latest_version(client: &reqwest::Client, package: &str) -> Option<String> {
    let url = format!("https://registry.npmjs.org/{package}");
    match client.get(&url).send().await {
        Ok(resp) => {
            if let Ok(json) = resp.json::<serde_json::Value>().await {
                json.get("dist-tags")
                    .and_then(|tags| tags.get("latest"))
                    .and_then(|v| v.as_str())
                    .map(|s| s.to_string())
            } else {
                None
            }
        }
        Err(_) => None,
    }
}

/// 从版本输出中提取纯版本号
fn extract_version(raw: &str) -> String {
    // 匹配 semver 格式: x.y.z 或 x.y.z-xxx
    let re = regex::Regex::new(r"\d+\.\d+\.\d+(-[\w.]+)?").unwrap();
    re.find(raw)
        .map(|m| m.as_str().to_string())
        .unwrap_or_else(|| raw.to_string())
}

/// 尝试直接执行命令获取版本
fn try_get_version(tool: &str) -> (Option<String>, Option<String>) {
    use std::process::Command;

    let output = if cfg!(target_os = "windows") {
        Command::new("cmd")
            .args(["/C", &format!("{tool} --version")])
            .output()
    } else {
        Command::new("sh")
            .arg("-c")
            .arg(format!("{tool} --version"))
            .output()
    };

    match output {
        Ok(out) => {
            if out.status.success() {
                let raw = String::from_utf8_lossy(&out.stdout).trim().to_string();
                (Some(extract_version(&raw)), None)
            } else {
                let err = String::from_utf8_lossy(&out.stderr).trim().to_string();
                (
                    None,
                    Some(if err.is_empty() {
                        "未安装或无法执行".to_string()
                    } else {
                        err
                    }),
                )
            }
        }
        Err(e) => (None, Some(e.to_string())),
    }
}

/// 扫描常见路径查找 CLI
fn scan_cli_version(tool: &str) -> (Option<String>, Option<String>) {
    use std::process::Command;

    let home = dirs::home_dir().unwrap_or_default();

    // 常见的 npm 全局安装路径
    let mut search_paths: Vec<std::path::PathBuf> = vec![
        home.join(".npm-global/bin"),
        home.join(".local/bin"),
        home.join("n/bin"), // n version manager
    ];

    #[cfg(target_os = "macos")]
    {
        search_paths.push(std::path::PathBuf::from("/opt/homebrew/bin"));
        search_paths.push(std::path::PathBuf::from("/usr/local/bin"));
    }

    #[cfg(target_os = "linux")]
    {
        search_paths.push(std::path::PathBuf::from("/usr/local/bin"));
        search_paths.push(std::path::PathBuf::from("/usr/bin"));
    }

    #[cfg(target_os = "windows")]
    {
        if let Some(appdata) = dirs::data_dir() {
            search_paths.push(appdata.join("npm"));
        }
        search_paths.push(std::path::PathBuf::from("C:\\Program Files\\nodejs"));
    }

    // 扫描 nvm 目录下的所有 node 版本
    let nvm_base = home.join(".nvm/versions/node");
    if nvm_base.exists() {
        if let Ok(entries) = std::fs::read_dir(&nvm_base) {
            for entry in entries.flatten() {
                let bin_path = entry.path().join("bin");
                if bin_path.exists() {
                    search_paths.push(bin_path);
                }
            }
        }
    }

    // 在每个路径中查找工具
    for path in &search_paths {
        let tool_path = if cfg!(target_os = "windows") {
            path.join(format!("{tool}.cmd"))
        } else {
            path.join(tool)
        };

        if tool_path.exists() {
            // 构建 PATH 环境变量，确保 node 可被找到
            let current_path = std::env::var("PATH").unwrap_or_default();
            let new_path = format!("{}:{}", path.display(), current_path);
            
            let output = Command::new(&tool_path)
                .arg("--version")
                .env("PATH", &new_path)
                .output();

            if let Ok(out) = output {
                if out.status.success() {
                    let raw = String::from_utf8_lossy(&out.stdout).trim().to_string();
                    return (Some(extract_version(&raw)), None);
                }
            }
        }
    }

    (None, Some("未安装或无法执行".to_string()))
}