//! Official Yostar JP launcher API bootstrap.
//!
//! This models the PC launcher update API used by the official JP launcher.
//! It is separate from Unity resource `server-info`: the launcher API can
//! discover the latest Windows client package and manifest, while resource
//! updates still come from the game client's server-info flow.

use crate::curl_transfer::{
    run_curl_with_retry_with_proxy as run_curl_command_with_retry, CurlProxyConfig,
};
use crate::official_download::DownloadError;
use bat_adapters::official::launcher::{YostarJpLauncherManifestFile, YOSTAR_JP_GAME_TAG};
use bat_core::ErrorCode;
use md5::{Digest, Md5};
use serde::Deserialize;
use std::path::Path;
use std::process::{Command, Output};
use std::time::{SystemTime, UNIX_EPOCH};

/// Official JP launcher API root.
pub const YOSTAR_JP_LAUNCHER_API_ROOT: &str = "https://api-launcher-jp.yo-star.com";

/// Salt embedded in the official JP launcher for request signing.
pub const YOSTAR_JP_LAUNCHER_AUTH_SALT: &str = "DE7108E9B2842FD460F4777702727869";

/// Official primary JP PC launcher package CDN host.
pub const YOSTAR_JP_LAUNCHER_PRIMARY_CDN_HOST: &str = "launcher-pkg-ba-jp.yo-star.com";

/// Official backup JP PC launcher package CDN host.
pub const YOSTAR_JP_LAUNCHER_BACKUP_CDN_HOST: &str = "launcher-pkg-ba-jp-bk.yo-star.com";

const DEFAULT_LAUNCHER_RETRY_ATTEMPTS: usize = 3;

/// Latest official PC client metadata returned by `/api/launcher/game/config`.
#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
pub struct YostarJpLauncherGameConfig {
    /// Latest Windows client version.
    pub game_latest_version: String,
    /// Latest manifest basis path.
    pub game_latest_file_path: String,
    /// Lowest allowed installed client version.
    #[serde(default)]
    pub game_lowest_version: Option<String>,
    /// Executable name without `.exe`.
    #[serde(default)]
    pub game_start_exe_name: Option<String>,
    /// Launcher arguments.
    #[serde(default)]
    pub game_start_params: Vec<String>,
    /// Displayed decompressed size.
    #[serde(default)]
    pub decompression_size: Option<String>,
}

/// Official launcher CDN roots used for Windows client package files.
#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
pub struct YostarJpLauncherCdnConfig {
    /// Primary CDN root.
    pub primary_cdn: String,
    /// Backup CDN root.
    pub back_up_cdn: String,
}

/// Official launcher manifest URL response returned by
/// `/api/launcher/game/config/json`.
#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
pub struct YostarJpLauncherManifestUrl {
    /// Remote manifest URL on the official launcher package CDN.
    pub url: String,
}

/// Remote PC launcher manifest used to compute install/update diffs.
#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
pub struct YostarJpLauncherRemoteManifest {
    /// Optional manifest source field.
    #[serde(default)]
    pub source: Option<String>,
    /// Remote package files.
    #[serde(default, rename = "file")]
    pub files: Vec<YostarJpLauncherManifestFile>,
}

/// Signed official launcher API fetcher using `curl`.
#[derive(Debug, Clone)]
pub struct OfficialLauncherBootstrapService {
    curl_command: String,
    curl_proxy: CurlProxyConfig,
    launcher_version: String,
    retry_attempts: usize,
}

impl OfficialLauncherBootstrapService {
    /// Creates a fetcher using `curl` from `PATH`.
    pub fn new(launcher_version: impl Into<String>) -> Self {
        Self::with_curl_command(launcher_version, "curl")
    }

    /// Creates a fetcher with an explicit `curl` command.
    pub fn with_curl_command(
        launcher_version: impl Into<String>,
        curl_command: impl Into<String>,
    ) -> Self {
        Self {
            curl_command: curl_command.into(),
            curl_proxy: CurlProxyConfig::default(),
            launcher_version: launcher_version.into(),
            retry_attempts: DEFAULT_LAUNCHER_RETRY_ATTEMPTS,
        }
    }

    /// Sets the proxy configuration for launcher `curl` transfers.
    pub fn with_proxy_config(mut self, curl_proxy: CurlProxyConfig) -> Self {
        self.curl_proxy = curl_proxy;
        self
    }

    /// Sets the number of attempts for each launcher `curl` transfer.
    pub fn with_retry_attempts(mut self, retry_attempts: usize) -> Self {
        self.retry_attempts = retry_attempts.max(1);
        self
    }

    /// Fetches latest official PC game config.
    pub fn fetch_game_config(&self) -> Result<YostarJpLauncherGameConfig, DownloadError> {
        let envelope = self.fetch_launcher_envelope("/api/launcher/game/config")?;
        let config: YostarJpLauncherGameConfig =
            serde_json::from_value(envelope.data).map_err(|error| {
                DownloadError::new(
                    ErrorCode::LAUNCHER_RESPONSE_INVALID,
                    format!("解析官方启动器 game config 数据失败：{error}"),
                )
            })?;

        if config.game_latest_version.is_empty() || config.game_latest_file_path.is_empty() {
            return Err(DownloadError::new(
                ErrorCode::LAUNCHER_RESPONSE_INVALID,
                "官方启动器 game config 缺少最新版本或基准路径",
            ));
        }

        Ok(config)
    }

    /// Fetches official CDN config for PC client package downloads.
    pub fn fetch_cdn_config(&self) -> Result<YostarJpLauncherCdnConfig, DownloadError> {
        let envelope = self.fetch_launcher_envelope("/api/launcher/advanced/game/download/cdn")?;
        serde_json::from_value(envelope.data).map_err(|error| {
            DownloadError::new(
                ErrorCode::LAUNCHER_RESPONSE_INVALID,
                format!("解析官方启动器 CDN config 数据失败：{error}"),
            )
        })
    }

    /// Fetches the official remote manifest URL for a PC client version and
    /// basis path.
    pub fn fetch_manifest_url(
        &self,
        version: &str,
        file_path: &str,
    ) -> Result<YostarJpLauncherManifestUrl, DownloadError> {
        if version.is_empty() || file_path.is_empty() {
            return Err(DownloadError::new(
                ErrorCode::INVALID_ARGUMENT,
                "启动器 manifest 版本和文件路径不能为空",
            ));
        }

        let path = format!(
            "/api/launcher/game/config/json?version={}&file_path={}",
            percent_encode_query_value(version),
            percent_encode_query_value(file_path)
        );
        let envelope = self.fetch_launcher_envelope(&path)?;
        let manifest_url: YostarJpLauncherManifestUrl = serde_json::from_value(envelope.data)
            .map_err(|error| {
                DownloadError::new(
                    ErrorCode::LAUNCHER_RESPONSE_INVALID,
                    format!("解析官方启动器 manifest URL 数据失败：{error}"),
                )
            })?;

        if !is_official_launcher_package_url(&manifest_url.url) {
            return Err(DownloadError::new(
                ErrorCode::NON_OFFICIAL_URL,
                format!(
                    "官方启动器 API 返回了非官方 manifest URL：{}",
                    manifest_url.url
                ),
            ));
        }

        Ok(manifest_url)
    }

    /// Fetches and parses an official remote PC launcher manifest.
    pub fn fetch_remote_manifest(
        &self,
        manifest_url: &str,
    ) -> Result<YostarJpLauncherRemoteManifest, DownloadError> {
        if !is_official_launcher_package_url(manifest_url) {
            return Err(DownloadError::new(
                ErrorCode::NON_OFFICIAL_URL,
                format!("拒绝拉取非官方启动器 manifest URL：{manifest_url}"),
            ));
        }

        let output = self.run_curl_with_retry(manifest_url, || {
            let mut command = Command::new(&self.curl_command);
            command
                .arg("--fail")
                .arg("--location")
                .arg("--silent")
                .arg("--show-error")
                .arg("--url")
                .arg(manifest_url);
            command
        })?;

        // launcher 链内容问题（API 响应、远端 manifest、包内容）统一归
        // LAUNCHER_RESPONSE_INVALID；MANIFEST_PARSE_FAILED 保留给资源侧
        // manifest / Addressables catalog。
        let manifest: YostarJpLauncherRemoteManifest = serde_json::from_slice(&output.stdout)
            .map_err(|error| {
                DownloadError::new(
                    ErrorCode::LAUNCHER_RESPONSE_INVALID,
                    format!("解析官方启动器 manifest 失败：{error}"),
                )
            })?;
        if manifest.files.is_empty() {
            return Err(DownloadError::new(
                ErrorCode::LAUNCHER_RESPONSE_INVALID,
                "官方启动器远端 manifest 没有文件条目",
            ));
        }

        Ok(manifest)
    }

    /// Fetches latest PC game config, then follows the official manifest URL.
    pub fn fetch_latest_remote_manifest(
        &self,
    ) -> Result<
        (
            YostarJpLauncherGameConfig,
            YostarJpLauncherManifestUrl,
            YostarJpLauncherRemoteManifest,
        ),
        DownloadError,
    > {
        let game_config = self.fetch_game_config()?;
        let manifest_url = self.fetch_manifest_url(
            &game_config.game_latest_version,
            &game_config.game_latest_file_path,
        )?;
        let manifest = self.fetch_remote_manifest(&manifest_url.url)?;

        Ok((game_config, manifest_url, manifest))
    }

    /// Fetches a signed official launcher API endpoint and parses the generic
    /// response envelope.
    pub fn fetch_launcher_envelope(&self, path: &str) -> Result<LauncherEnvelope, DownloadError> {
        // launcher_version 是用户可控的 CLI 输入（--launcher-version），空值是
        // 参数错误而非内部错误，在进入签名流程前显式归 INVALID_ARGUMENT。
        if self.launcher_version.is_empty() {
            return Err(DownloadError::new(
                ErrorCode::INVALID_ARGUMENT,
                "启动器版本不能为空",
            ));
        }
        let url = launcher_api_url(path)?;
        let authorization = launcher_authorization_header(&self.launcher_version, "", None)?;

        let output = self.run_curl_with_retry(&url, || {
            let mut command = Command::new(&self.curl_command);
            command
                .arg("--fail")
                .arg("--location")
                .arg("--silent")
                .arg("--show-error")
                .arg("--header")
                .arg("Content-Type: application/json;charset=UTF-8")
                .arg("--header")
                .arg(format!("Authorization: {authorization}"))
                .arg("--url")
                .arg(&url);
            command
        })?;

        let envelope: LauncherEnvelope =
            serde_json::from_slice(&output.stdout).map_err(|error| {
                DownloadError::new(
                    ErrorCode::LAUNCHER_RESPONSE_INVALID,
                    format!("解析官方启动器 API 响应失败：{error}"),
                )
            })?;

        if envelope.code != 200 {
            return Err(DownloadError::new(
                ErrorCode::LAUNCHER_API_REJECTED,
                format!(
                    "官方启动器 API 返回错误码 {}：{}",
                    envelope.code,
                    envelope
                        .message
                        .as_deref()
                        .or(envelope.msg.as_deref())
                        .unwrap_or("<无消息>")
                ),
            ));
        }

        Ok(envelope)
    }

    fn run_curl_with_retry(
        &self,
        url: &str,
        mut build_command: impl FnMut() -> Command,
    ) -> Result<Output, DownloadError> {
        run_curl_command_with_retry(
            Path::new(&self.curl_command),
            url,
            None,
            self.retry_attempts,
            &self.curl_proxy,
            &mut build_command,
        )
        .map_err(|error| {
            // 保留 curl 失败的准确网络域码（403/404/DNS/连接/超时/TLS/代理等），
            // 进程类失败归 INTERNAL。
            let code = error.final_error_code().unwrap_or(ErrorCode::INTERNAL);
            DownloadError::new(code, format!("curl 拉取失败 {url}：{error}"))
        })
    }
}

/// Generic official launcher API response envelope.
#[derive(Debug, Clone, Deserialize, PartialEq)]
pub struct LauncherEnvelope {
    /// Numeric response code. Official launcher treats `200` as success.
    pub code: i64,
    /// Optional message field.
    #[serde(default)]
    pub message: Option<String>,
    /// Optional alternate message field.
    #[serde(default)]
    pub msg: Option<String>,
    /// Response payload.
    pub data: serde_json::Value,
}

/// Builds an official launcher API URL from a path.
pub fn launcher_api_url(path: &str) -> Result<String, String> {
    if !path.starts_with('/') || path.contains("..") || path.contains('\\') {
        return Err(format!("官方启动器 API 路径无效：{path}"));
    }

    Ok(format!("{YOSTAR_JP_LAUNCHER_API_ROOT}{path}"))
}

/// Returns true when a URL points to an official JP PC launcher package host.
pub fn is_official_launcher_package_url(url: &str) -> bool {
    let Some(rest) = url.strip_prefix("https://") else {
        return false;
    };
    let host = rest.split('/').next().unwrap_or_default();
    matches!(
        host,
        YOSTAR_JP_LAUNCHER_PRIMARY_CDN_HOST | YOSTAR_JP_LAUNCHER_BACKUP_CDN_HOST
    )
}

/// Builds an official launcher package URL from an official CDN root and a
/// relative package path.
///
/// 生产调用方传入的 `cdn_root` 来自官方 API 的远端响应（`fetch_cdn_config`），
/// `file_path` 来自远端 manifest 内容——两者都是运行时外部输入而非硬编码常量，
/// 因此这里的拒绝必须携带准确错误码：非官方根地址是安全边界拒绝
/// （NON_OFFICIAL_URL），非法包路径是远端内容缺陷（LAUNCHER_RESPONSE_INVALID）。
pub fn launcher_package_url(cdn_root: &str, file_path: &str) -> Result<String, DownloadError> {
    if !is_official_launcher_package_url(cdn_root) {
        return Err(DownloadError::new(
            ErrorCode::NON_OFFICIAL_URL,
            format!("启动器 CDN 根地址不是官方地址：{cdn_root}"),
        ));
    }

    validate_launcher_package_path(file_path)
        .map_err(|error| DownloadError::new(ErrorCode::LAUNCHER_RESPONSE_INVALID, error))?;
    Ok(format!(
        "{}/{}",
        cdn_root.trim_end_matches('/'),
        normalize_relative_path(file_path)
    ))
}

fn percent_encode_query_value(value: &str) -> String {
    let mut encoded = String::new();

    for byte in value.bytes() {
        if byte.is_ascii_alphanumeric() || matches!(byte, b'-' | b'.' | b'_' | b'~') {
            encoded.push(byte as char);
        } else {
            encoded.push_str(&format!("%{byte:02X}"));
        }
    }

    encoded
}

fn normalize_relative_path(path: &str) -> String {
    path.replace('\\', "/")
}

fn validate_launcher_package_path(path: &str) -> Result<(), String> {
    if path.is_empty() || path.starts_with('/') || path.starts_with('\\') {
        return Err(format!("启动器包路径无效：{path}"));
    }

    for segment in path.split('/') {
        if segment.is_empty() || segment == "." || segment == ".." {
            return Err(format!("启动器包路径无效：{path}"));
        }
        if segment.contains('\\') || segment.contains('?') || segment.contains('#') {
            return Err(format!("启动器包路径无效：{path}"));
        }
    }

    Ok(())
}

/// Builds the official launcher `Authorization` header.
///
/// This matches the official launcher logic:
/// `md5(JSON(head) + body + salt)`, where `head` contains `game_tag`,
/// Unix timestamp, and launcher version.
pub fn launcher_authorization_header(
    launcher_version: &str,
    body: &str,
    timestamp: Option<u64>,
) -> Result<String, String> {
    if launcher_version.is_empty() {
        return Err("启动器版本不能为空".into());
    }

    let timestamp = match timestamp {
        Some(timestamp) => timestamp,
        None => SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .map_err(|error| format!("系统时间早于 Unix epoch：{error}"))?
            .as_secs(),
    };

    let head = serde_json::json!({
        "game_tag": YOSTAR_JP_GAME_TAG,
        "time": timestamp,
        "version": launcher_version,
    });
    let head_json = serde_json::to_string(&head)
        .map_err(|error| format!("序列化启动器认证 head 失败：{error}"))?;
    let mut hasher = Md5::new();
    hasher.update(head_json.as_bytes());
    hasher.update(body.as_bytes());
    hasher.update(YOSTAR_JP_LAUNCHER_AUTH_SALT.as_bytes());
    let sign = hex::encode(hasher.finalize());

    serde_json::to_string(&serde_json::json!({
        "head": head,
        "sign": sign,
    }))
    .map_err(|error| format!("序列化启动器认证 header 失败：{error}"))
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs;
    use std::path::Path;
    use tempfile::TempDir;

    fn write_shell_script(path: &Path, script: &str) {
        fs::write(path, script).unwrap();
        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let mut permissions = fs::metadata(path).unwrap().permissions();
            permissions.set_mode(0o755);
            fs::set_permissions(path, permissions).unwrap();
        }
    }

    fn fake_flaky_launcher_curl_script() -> &'static str {
        r#"#!/bin/sh
set -eu
url=""
while [ "$#" -gt 0 ]; do
    case "$1" in
        --url)
            url="$2"
            shift 2
            ;;
        *)
            shift
            ;;
    esac
done
state="$0.state"
count=0
if [ -f "$state" ]; then
    count="$(cat "$state")"
fi
count=$((count + 1))
printf '%s' "$count" > "$state"
if [ "$count" -eq 1 ]; then
    printf '%s\n' "temporary launcher failure" >&2
    exit 35
fi
case "$url" in
    */api/launcher/game/config)
        printf '%s' '{"code":200,"data":{"game_latest_version":"1.70.436321","game_latest_file_path":"prod/manifest/BlueArchive_JP_TEMP","game_lowest_version":"1.69.0","game_start_params":[]}}'
        ;;
    *)
        printf '%s\n' "unexpected url: $url" >&2
        exit 22
        ;;
esac
"#
    }

    #[test]
    fn builds_official_launcher_api_url() {
        assert_eq!(
            launcher_api_url("/api/launcher/game/config").unwrap(),
            "https://api-launcher-jp.yo-star.com/api/launcher/game/config"
        );
        assert!(launcher_api_url("api/launcher/game/config").is_err());
        assert!(launcher_api_url("/api/../secret").is_err());
    }

    #[test]
    fn identifies_official_launcher_package_urls_only() {
        assert!(is_official_launcher_package_url(
            "https://launcher-pkg-ba-jp.yo-star.com/prod/manifest.json"
        ));
        assert!(is_official_launcher_package_url(
            "https://launcher-pkg-ba-jp-bk.yo-star.com/prod/manifest.json"
        ));
        assert!(!is_official_launcher_package_url(
            "https://launcher-pkg-ba-jp.bluearchive.cafe/prod/manifest.json"
        ));
        assert!(!is_official_launcher_package_url(
            "http://launcher-pkg-ba-jp.yo-star.com/prod/manifest.json"
        ));
    }

    #[test]
    fn builds_official_launcher_package_url() {
        assert_eq!(
            launcher_package_url(
                "https://launcher-pkg-ba-jp.yo-star.com",
                "prod/ZIP_TEMP/BlueArchive_JP_TEMP/BlueArchive_JP-1.70.436321-game.zip"
            )
            .unwrap(),
            "https://launcher-pkg-ba-jp.yo-star.com/prod/ZIP_TEMP/BlueArchive_JP_TEMP/BlueArchive_JP-1.70.436321-game.zip"
        );
        assert!(launcher_package_url(
            "https://launcher-pkg-ba-jp.bluearchive.cafe",
            "prod/ZIP_TEMP/BlueArchive_JP_TEMP/BlueArchive_JP-1.70.436321-game.zip"
        )
        .is_err());
    }

    #[test]
    fn encodes_launcher_manifest_query_values() {
        assert_eq!(
            percent_encode_query_value("prod/ZIP_TEMP/BlueArchive_JP_TEMP/game.zip"),
            "prod%2FZIP_TEMP%2FBlueArchive_JP_TEMP%2Fgame.zip"
        );
    }

    #[test]
    fn builds_stable_launcher_authorization_header() {
        let header = launcher_authorization_header("1.7.2", "", Some(1_700_000_000)).unwrap();
        let value: serde_json::Value = serde_json::from_str(&header).unwrap();

        assert_eq!(value["head"]["game_tag"], "BlueArchive_JP");
        assert_eq!(value["head"]["time"], 1_700_000_000);
        assert_eq!(value["head"]["version"], "1.7.2");
        assert_eq!(value["sign"], "b457b5bc3d7796d7a37040d4b7990cb9");
    }

    #[test]
    fn parses_launcher_game_config_payload() {
        let config: YostarJpLauncherGameConfig = serde_json::from_str(
            r#"{
              "game_latest_version": "1.70.0",
              "game_latest_file_path": "prod/ZIP_TEMP/BlueArchive_JP_TEMP/BlueArchive_JP-1.70.436321-game.zip",
              "game_lowest_version": "1.69.0",
              "game_start_exe_name": "xldr_BlueArchiveOnline_JP_loader_x64",
              "game_start_params": ["BlueArchive.exe"]
            }"#,
        )
        .unwrap();

        assert_eq!(config.game_latest_version, "1.70.0");
        assert_eq!(
            config.game_start_exe_name.as_deref(),
            Some("xldr_BlueArchiveOnline_JP_loader_x64")
        );
        assert_eq!(config.game_start_params, vec!["BlueArchive.exe"]);
    }

    #[test]
    fn parses_launcher_manifest_url_payload() {
        let manifest_url: YostarJpLauncherManifestUrl = serde_json::from_str(
            r#"{
              "url": "https://launcher-pkg-ba-jp.yo-star.com/prod/ZIP_TEMP/BlueArchive_JP_TEMP/manifest.json"
            }"#,
        )
        .unwrap();

        assert!(is_official_launcher_package_url(&manifest_url.url));
    }

    #[test]
    fn parses_remote_manifest_payload() {
        let manifest: YostarJpLauncherRemoteManifest = serde_json::from_str(
            r#"{
              "source": "prod/ZIP_TEMP/BlueArchive_JP_TEMP/BlueArchive_JP-1.70.436321-game.zip",
              "file": [
                {
                  "path": "/BlueArchive.exe",
                  "size": "100",
                  "hash": "123",
                  "vc": "abc"
                }
              ]
            }"#,
        )
        .unwrap();

        assert_eq!(manifest.files.len(), 1);
        assert_eq!(manifest.files[0].path, "/BlueArchive.exe");
    }

    fn fake_launcher_config_response_script(payload: &str) -> String {
        format!(
            r#"#!/bin/sh
set -eu
url=""
while [ "$#" -gt 0 ]; do
    case "$1" in
        --url) url="$2"; shift 2 ;;
        *) shift ;;
    esac
done
case "$url" in
    */api/launcher/game/config)
        printf '%s' '{payload}'
        ;;
    *)
        printf '%s\n' "unexpected url: $url" >&2
        exit 22
        ;;
esac
"#,
            payload = payload
        )
    }

    fn fake_launcher_http_404_script() -> &'static str {
        r#"#!/bin/sh
set -eu
printf 'curl: (22) The requested URL returned error: 404\n' >&2
exit 22
"#
    }

    fn launcher_service_with_script(script: &str) -> (TempDir, OfficialLauncherBootstrapService) {
        let bin_dir = TempDir::new().unwrap();
        let curl_path = bin_dir.path().join("curl");
        write_shell_script(&curl_path, script);
        let service = OfficialLauncherBootstrapService::with_curl_command(
            "1.7.2",
            curl_path.to_string_lossy().to_string(),
        )
        .with_retry_attempts(1);
        (bin_dir, service)
    }

    #[test]
    fn launcher_api_non_200_maps_to_launcher_api_rejected() {
        let (_bin, service) = launcher_service_with_script(&fake_launcher_config_response_script(
            r#"{"code":403,"message":"version rejected","data":{}}"#,
        ));
        let error = service.fetch_game_config().unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::LAUNCHER_API_REJECTED.id());
    }

    #[test]
    fn launcher_api_bad_json_maps_to_launcher_response_invalid() {
        let (_bin, service) =
            launcher_service_with_script(&fake_launcher_config_response_script("not-json"));
        let error = service.fetch_game_config().unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::LAUNCHER_RESPONSE_INVALID.id());
    }

    #[test]
    fn launcher_http_404_preserves_network_error_code() {
        let (_bin, service) = launcher_service_with_script(fake_launcher_http_404_script());
        let error = service.fetch_game_config().unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::HTTP_NOT_FOUND.id());
    }

    #[test]
    fn non_official_manifest_url_maps_to_non_official_url() {
        let (_bin, service) = launcher_service_with_script(fake_launcher_http_404_script());
        let error = service
            .fetch_remote_manifest("https://launcher-pkg-ba-jp.bluearchive.cafe/prod/manifest.json")
            .unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::NON_OFFICIAL_URL.id());
    }

    #[test]
    fn launcher_package_url_maps_rejections_to_error_codes() {
        // cdn_root 来自远端 API 响应：非官方根是安全边界拒绝。
        let error = launcher_package_url(
            "https://launcher-pkg-ba-jp.bluearchive.cafe",
            "prod/game.zip",
        )
        .unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::NON_OFFICIAL_URL.id());

        // file_path 来自远端 manifest 内容：非法路径是远端内容缺陷。
        let error = launcher_package_url(
            "https://launcher-pkg-ba-jp.yo-star.com",
            "prod/../escape.zip",
        )
        .unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::LAUNCHER_RESPONSE_INVALID.id());
    }

    #[test]
    fn empty_launcher_version_maps_to_invalid_argument() {
        // 空 --launcher-version 是用户参数错误，应在发起任何请求前归
        // INVALID_ARGUMENT（curl 指向不存在的路径以证明未发起请求）。
        let service = OfficialLauncherBootstrapService::with_curl_command(
            "",
            "/nonexistent/curl-must-not-run",
        );
        let error = service.fetch_game_config().unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::INVALID_ARGUMENT.id());
    }

    #[test]
    fn launcher_manifest_without_files_maps_to_launcher_response_invalid() {
        let bin_dir = TempDir::new().unwrap();
        let curl_path = bin_dir.path().join("curl");
        write_shell_script(
            &curl_path,
            r#"#!/bin/sh
printf '%s' '{"source":"prod/game.zip","file":[]}'
"#,
        );
        let service = OfficialLauncherBootstrapService::with_curl_command(
            "1.7.2",
            curl_path.to_string_lossy().to_string(),
        );
        let error = service
            .fetch_remote_manifest("https://launcher-pkg-ba-jp.yo-star.com/prod/manifest.json")
            .unwrap_err();
        assert_eq!(error.code().id(), ErrorCode::LAUNCHER_RESPONSE_INVALID.id());
    }

    #[test]
    fn retries_transient_launcher_api_failures() {
        let bin_dir = TempDir::new().unwrap();
        let curl_path = bin_dir.path().join("curl");
        write_shell_script(&curl_path, fake_flaky_launcher_curl_script());

        let service = OfficialLauncherBootstrapService::with_curl_command(
            "1.7.2",
            curl_path.to_string_lossy().to_string(),
        )
        .with_retry_attempts(2);

        let config = service.fetch_game_config().unwrap();

        assert_eq!(config.game_latest_version, "1.70.436321");
        assert_eq!(
            fs::read_to_string(curl_path.with_extension("state")).unwrap(),
            "2"
        );
    }
}