#![allow(non_snake_case)]

use crate::app_config::AppType;
use crate::init_status::{InitErrorPayload, SkillsMigrationPayload};
use crate::services::ProviderService;
use once_cell::sync::Lazy;
use regex::Regex;
use std::path::Path;
use std::str::FromStr;
use tauri::AppHandle;
use tauri::State;
use tauri_plugin_opener::OpenerExt;

#[cfg(target_os = "windows")]
use std::os::windows::process::CommandExt;

#[cfg(target_os = "windows")]
const CREATE_NO_WINDOW: u32 = 0x08000000;

/// 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())
}

/// 获取 Skills 自动导入（SSOT）迁移结果（若有）。
/// 只返回一次 Some({count})，之后返回 None，用于前端显示一次性 Toast 通知。
#[tauri::command]
pub async fn get_skills_migration_result() -> Result<Option<SkillsMigrationPayload>, String> {
    Ok(crate::init_status::take_skills_migration_result())
}

#[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();

    // 使用全局 HTTP 客户端（已包含代理配置）
    let client = crate::proxy::http_client::get();

    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) = if let Some(distro) = wsl_distro_for_tool(tool) {
            try_get_version_wsl(tool, &distro)
        } else {
            // 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,
    }
}

/// 预编译的版本号正则表达式
static VERSION_RE: Lazy<Regex> =
    Lazy::new(|| Regex::new(r"\d+\.\d+\.\d+(-[\w.]+)?").expect("Invalid version regex"));

/// 从版本输出中提取纯版本号
fn extract_version(raw: &str) -> String {
    VERSION_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;

    #[cfg(target_os = "windows")]
    let output = {
        Command::new("cmd")
            .args(["/C", &format!("{tool} --version")])
            .creation_flags(CREATE_NO_WINDOW)
            .output()
    };

    #[cfg(not(target_os = "windows"))]
    let output = {
        Command::new("sh")
            .arg("-c")
            .arg(format!("{tool} --version"))
            .output()
    };

    match output {
        Ok(out) => {
            let stdout = String::from_utf8_lossy(&out.stdout).trim().to_string();
            let stderr = String::from_utf8_lossy(&out.stderr).trim().to_string();
            if out.status.success() {
                let raw = if stdout.is_empty() { &stderr } else { &stdout };
                if raw.is_empty() {
                    (None, Some("not installed or not executable".to_string()))
                } else {
                    (Some(extract_version(raw)), None)
                }
            } else {
                let err = if stderr.is_empty() { stdout } else { stderr };
                (
                    None,
                    Some(if err.is_empty() {
                        "not installed or not executable".to_string()
                    } else {
                        err
                    }),
                )
            }
        }
        Err(e) => (None, Some(e.to_string())),
    }
}

/// 校验 WSL 发行版名称是否合法
/// WSL 发行版名称只允许字母、数字、连字符和下划线
#[cfg(target_os = "windows")]
fn is_valid_wsl_distro_name(name: &str) -> bool {
    !name.is_empty()
        && name.len() <= 64
        && name
            .chars()
            .all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_' || c == '.')
}

#[cfg(target_os = "windows")]
fn try_get_version_wsl(tool: &str, distro: &str) -> (Option<String>, Option<String>) {
    use std::process::Command;

    // 防御性断言：tool 只能是预定义的值
    debug_assert!(
        ["claude", "codex", "gemini"].contains(&tool),
        "unexpected tool name: {tool}"
    );

    // 校验 distro 名称，防止命令注入
    if !is_valid_wsl_distro_name(distro) {
        return (None, Some(format!("[WSL:{distro}] invalid distro name")));
    }

    let output = Command::new("wsl.exe")
        .args([
            "-d",
            distro,
            "--",
            "sh",
            "-lc",
            &format!("{tool} --version"),
        ])
        .creation_flags(CREATE_NO_WINDOW)
        .output();

    match output {
        Ok(out) => {
            let stdout = String::from_utf8_lossy(&out.stdout).trim().to_string();
            let stderr = String::from_utf8_lossy(&out.stderr).trim().to_string();
            if out.status.success() {
                let raw = if stdout.is_empty() { &stderr } else { &stdout };
                if raw.is_empty() {
                    (
                        None,
                        Some(format!("[WSL:{distro}] not installed or not executable")),
                    )
                } else {
                    (Some(extract_version(raw)), None)
                }
            } else {
                let err = if stderr.is_empty() { stdout } else { stderr };
                (
                    None,
                    Some(format!(
                        "[WSL:{distro}] {}",
                        if err.is_empty() {
                            "not installed or not executable".to_string()
                        } else {
                            err
                        }
                    )),
                )
            }
        }
        Err(e) => (None, Some(format!("[WSL:{distro}] exec failed: {e}"))),
    }
}

/// 非 Windows 平台的 WSL 版本检测存根
/// 注意：此函数实际上不会被调用，因为 `wsl_distro_from_path` 在非 Windows 平台总是返回 None。
/// 保留此函数是为了保持 API 一致性，防止未来重构时遗漏。
#[cfg(not(target_os = "windows"))]
fn try_get_version_wsl(_tool: &str, _distro: &str) -> (Option<String>, Option<String>) {
    (
        None,
        Some("WSL check not supported on this platform".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"));
    }

    // 添加 fnm 路径支持
    let fnm_base = home.join(".local/state/fnm_multishells");
    if fnm_base.exists() {
        if let Ok(entries) = std::fs::read_dir(&fnm_base) {
            for entry in entries.flatten() {
                let bin_path = entry.path().join("bin");
                if bin_path.exists() {
                    search_paths.push(bin_path);
                }
            }
        }
    }

    // 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();

            #[cfg(target_os = "windows")]
            let new_path = format!("{};{}", path.display(), current_path);

            #[cfg(not(target_os = "windows"))]
            let new_path = format!("{}:{}", path.display(), current_path);

            #[cfg(target_os = "windows")]
            let output = {
                // 使用 cmd /C 包装执行，确保子进程也在隐藏的控制台中运行
                Command::new("cmd")
                    .args(["/C", &format!("\"{}\" --version", tool_path.display())])
                    .env("PATH", &new_path)
                    .creation_flags(CREATE_NO_WINDOW)
                    .output()
            };

            #[cfg(not(target_os = "windows"))]
            let output = {
                Command::new(&tool_path)
                    .arg("--version")
                    .env("PATH", &new_path)
                    .output()
            };

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

    (None, Some("not installed or not executable".to_string()))
}

fn wsl_distro_for_tool(tool: &str) -> Option<String> {
    let override_dir = match tool {
        "claude" => crate::settings::get_claude_override_dir(),
        "codex" => crate::settings::get_codex_override_dir(),
        "gemini" => crate::settings::get_gemini_override_dir(),
        _ => None,
    }?;

    wsl_distro_from_path(&override_dir)
}

/// 从 UNC 路径中提取 WSL 发行版名称
/// 支持 `\\wsl$\Ubuntu\...` 和 `\\wsl.localhost\Ubuntu\...` 两种格式
#[cfg(target_os = "windows")]
fn wsl_distro_from_path(path: &Path) -> Option<String> {
    use std::path::{Component, Prefix};
    let Some(Component::Prefix(prefix)) = path.components().next() else {
        return None;
    };
    match prefix.kind() {
        Prefix::UNC(server, share) | Prefix::VerbatimUNC(server, share) => {
            let server_name = server.to_string_lossy();
            if server_name.eq_ignore_ascii_case("wsl$")
                || server_name.eq_ignore_ascii_case("wsl.localhost")
            {
                let distro = share.to_string_lossy().to_string();
                if !distro.is_empty() {
                    return Some(distro);
                }
            }
            None
        }
        _ => None,
    }
}

/// 非 Windows 平台不支持 WSL 路径解析
#[cfg(not(target_os = "windows"))]
fn wsl_distro_from_path(_path: &Path) -> Option<String> {
    None
}

/// 打开指定提供商的终端
///
/// 根据提供商配置的环境变量启动一个带有该提供商特定设置的终端
/// 无需检查是否为当前激活的提供商，任何提供商都可以打开终端
#[allow(non_snake_case)]
#[tauri::command]
pub async fn open_provider_terminal(
    state: State<'_, crate::store::AppState>,
    app: String,
    #[allow(non_snake_case)] providerId: String,
) -> Result<bool, String> {
    let app_type = AppType::from_str(&app).map_err(|e| e.to_string())?;

    // 获取提供商配置
    let providers = ProviderService::list(state.inner(), app_type.clone())
        .map_err(|e| format!("获取提供商列表失败: {e}"))?;

    let provider = providers
        .get(&providerId)
        .ok_or_else(|| format!("提供商 {providerId} 不存在"))?;

    // 从提供商配置中提取环境变量
    let config = &provider.settings_config;
    let env_vars = extract_env_vars_from_config(config, &app_type);

    // 根据平台启动终端，传入提供商ID用于生成唯一的配置文件名
    launch_terminal_with_env(env_vars, &providerId).map_err(|e| format!("启动终端失败: {e}"))?;

    Ok(true)
}

/// 从提供商配置中提取环境变量
fn extract_env_vars_from_config(
    config: &serde_json::Value,
    app_type: &AppType,
) -> Vec<(String, String)> {
    let mut env_vars = Vec::new();

    let Some(obj) = config.as_object() else {
        return env_vars;
    };

    // 处理 env 字段（Claude/Gemini 通用）
    if let Some(env) = obj.get("env").and_then(|v| v.as_object()) {
        for (key, value) in env {
            if let Some(str_val) = value.as_str() {
                env_vars.push((key.clone(), str_val.to_string()));
            }
        }

        // 处理 base_url: 根据应用类型添加对应的环境变量
        let base_url_key = match app_type {
            AppType::Claude => Some("ANTHROPIC_BASE_URL"),
            AppType::Gemini => Some("GOOGLE_GEMINI_BASE_URL"),
            _ => None,
        };

        if let Some(key) = base_url_key {
            if let Some(url_str) = env.get(key).and_then(|v| v.as_str()) {
                env_vars.push((key.to_string(), url_str.to_string()));
            }
        }
    }

    // Codex 使用 auth 字段转换为 OPENAI_API_KEY
    if *app_type == AppType::Codex {
        if let Some(auth) = obj.get("auth").and_then(|v| v.as_str()) {
            env_vars.push(("OPENAI_API_KEY".to_string(), auth.to_string()));
        }
    }

    // Gemini 使用 api_key 字段转换为 GEMINI_API_KEY
    if *app_type == AppType::Gemini {
        if let Some(api_key) = obj.get("api_key").and_then(|v| v.as_str()) {
            env_vars.push(("GEMINI_API_KEY".to_string(), api_key.to_string()));
        }
    }

    env_vars
}

/// 创建临时配置文件并启动 claude 终端
/// 使用 --settings 参数传入提供商特定的 API 配置
fn launch_terminal_with_env(
    env_vars: Vec<(String, String)>,
    provider_id: &str,
) -> Result<(), String> {
    let temp_dir = std::env::temp_dir();
    let config_file = temp_dir.join(format!(
        "claude_{}_{}.json",
        provider_id,
        std::process::id()
    ));

    // 创建并写入配置文件
    write_claude_config(&config_file, &env_vars)?;

    #[cfg(target_os = "macos")]
    {
        launch_macos_terminal(&config_file)?;
        Ok(())
    }

    #[cfg(target_os = "linux")]
    {
        launch_linux_terminal(&config_file)?;
        Ok(())
    }

    #[cfg(target_os = "windows")]
    {
        launch_windows_terminal(&temp_dir, &config_file)?;
        return Ok(());
    }

    #[cfg(not(any(target_os = "macos", target_os = "linux", target_os = "windows")))]
    Err("不支持的操作系统".to_string())
}

/// 写入 claude 配置文件
fn write_claude_config(
    config_file: &std::path::Path,
    env_vars: &[(String, String)],
) -> Result<(), String> {
    let mut config_obj = serde_json::Map::new();
    let mut env_obj = serde_json::Map::new();

    for (key, value) in env_vars {
        env_obj.insert(key.clone(), serde_json::Value::String(value.clone()));
    }

    config_obj.insert("env".to_string(), serde_json::Value::Object(env_obj));

    let config_json =
        serde_json::to_string_pretty(&config_obj).map_err(|e| format!("序列化配置失败: {e}"))?;

    std::fs::write(config_file, config_json).map_err(|e| format!("写入配置文件失败: {e}"))
}

/// macOS: 使用 Terminal.app 启动
#[cfg(target_os = "macos")]
fn launch_macos_terminal(config_file: &std::path::Path) -> Result<(), String> {
    use std::os::unix::fs::PermissionsExt;
    use std::process::Command;

    let temp_dir = std::env::temp_dir();
    let script_file = temp_dir.join(format!("cc_switch_launcher_{}.sh", std::process::id()));

    let config_path = config_file.to_string_lossy();

    // Write the shell script to a temp file (no escaping needed!)
    let script_content = format!(
        r#"#!/bin/bash
trap 'rm -f "{config_path}" "{script_file}"' EXIT
echo "Using provider-specific claude config:"
echo "{config_path}"
claude --settings "{config_path}"
exec bash --norc --noprofile
"#,
        config_path = config_path,
        script_file = script_file.display()
    );

    std::fs::write(&script_file, &script_content).map_err(|e| format!("写入启动脚本失败: {e}"))?;

    // Make script executable
    std::fs::set_permissions(&script_file, std::fs::Permissions::from_mode(0o755))
        .map_err(|e| format!("设置脚本权限失败: {e}"))?;

    // Simple AppleScript - just execute the script file
    let applescript = format!(
        r#"tell application "Terminal"
    activate
    do script "bash '{}'"
end tell"#,
        script_file.display()
    );

    let output = Command::new("osascript")
        .arg("-e")
        .arg(&applescript)
        .output()
        .map_err(|e| format!("执行 osascript 失败: {e}"))?;

    if !output.status.success() {
        // Clean up on failure
        let _ = std::fs::remove_file(&script_file);
        let _ = std::fs::remove_file(config_file);
        let stderr = String::from_utf8_lossy(&output.stderr);
        return Err(format!(
            "AppleScript 执行失败 (exit code: {:?}): {}",
            output.status.code(),
            stderr
        ));
    }

    Ok(())
}

/// Linux: 尝试使用常见终端启动
#[cfg(target_os = "linux")]
fn launch_linux_terminal(config_file: &std::path::Path) -> Result<(), String> {
    use std::os::unix::fs::PermissionsExt;
    use std::process::Command;

    let terminals = [
        ("gnome-terminal", vec!["--"]),
        ("konsole", vec!["-e"]),
        ("xfce4-terminal", vec!["-e"]),
        ("mate-terminal", vec!["--"]),
        ("lxterminal", vec!["-e"]),
        ("alacritty", vec!["-e"]),
        ("kitty", vec!["-e"]),
    ];

    // Create temp script file (same approach as macOS)
    let temp_dir = std::env::temp_dir();
    let script_file = temp_dir.join(format!("cc_switch_launcher_{}.sh", std::process::id()));
    let config_path = config_file.to_string_lossy();

    let script_content = format!(
        r#"#!/bin/bash
trap 'rm -f "{config_path}" "{script_file}"' EXIT
echo "Using provider-specific claude config:"
echo "{config_path}"
claude --settings "{config_path}"
exec bash --norc --noprofile
"#,
        config_path = config_path,
        script_file = script_file.display()
    );

    std::fs::write(&script_file, &script_content).map_err(|e| format!("写入启动脚本失败: {e}"))?;

    std::fs::set_permissions(&script_file, std::fs::Permissions::from_mode(0o755))
        .map_err(|e| format!("设置脚本权限失败: {e}"))?;

    let mut last_error = String::from("未找到可用的终端");

    for (terminal, args) in terminals {
        // Check if terminal exists
        if std::path::Path::new(&format!("/usr/bin/{}", terminal)).exists()
            || std::path::Path::new(&format!("/bin/{}", terminal)).exists()
        {
            let result = Command::new(terminal)
                .args(&args)
                .arg("bash")
                .arg(script_file.to_string_lossy().as_ref())
                .output();

            match result {
                Ok(output) if output.status.success() => return Ok(()),
                Ok(output) => {
                    let stderr = String::from_utf8_lossy(&output.stderr);
                    last_error = format!("启动 {} 失败: {}", terminal, stderr);
                }
                Err(e) => {
                    last_error = format!("执行 {} 失败: {}", terminal, e);
                }
            }
        }
    }

    // Clean up on failure
    let _ = std::fs::remove_file(&script_file);
    let _ = std::fs::remove_file(config_file);
    Err(last_error)
}

/// Windows: 创建临时批处理文件启动
#[cfg(target_os = "windows")]
fn launch_windows_terminal(
    temp_dir: &std::path::Path,
    config_file: &std::path::Path,
) -> Result<(), String> {
    use std::process::Command;

    let bat_file = temp_dir.join(format!("cc_switch_claude_{}.bat", std::process::id()));
    let config_path_for_batch = config_file.to_string_lossy().replace('&', "^&");

    let content = format!(
        "@echo off
echo Using provider-specific claude config:
echo {}
claude --settings \"{}\"
del \"{}\" >nul 2>&1
del \"%~f0\" >nul 2>&1
",
        config_path_for_batch, config_path_for_batch, config_path_for_batch
    );

    std::fs::write(&bat_file, content).map_err(|e| format!("写入批处理文件失败: {e}"))?;

    // Use output() to capture errors from the start command
    // Use /K instead of /C to keep the window open after execution
    let output = Command::new("cmd")
        .args(["/C", "start", "cmd", "/K", &bat_file.to_string_lossy()])
        .creation_flags(CREATE_NO_WINDOW)
        .output()
        .map_err(|e| format!("执行 cmd 失败: {e}"))?;

    if !output.status.success() {
        // Clean up on failure
        let _ = std::fs::remove_file(&bat_file);
        let _ = std::fs::remove_file(config_file);
        let stderr = String::from_utf8_lossy(&output.stderr);
        return Err(format!(
            "启动 Windows 终端失败 (exit code: {:?}): {}",
            output.status.code(),
            stderr
        ));
    }

    Ok(())
}