use std::fs;
use std::path::Path;
use serde_json::json;
use std::sync::{Mutex, OnceLock};

use cc_switch_lib::{
    create_backup, get_claude_settings_path, read_json_file, sync_current_providers_to_live,
    update_settings, AppSettings, AppType, MultiAppConfig, Provider,
};

fn ensure_test_home() -> &'static Path {
    static HOME: OnceLock<std::path::PathBuf> = OnceLock::new();
    HOME.get_or_init(|| {
        let base = std::env::temp_dir().join("cc-switch-test-home");
        if base.exists() {
            let _ = std::fs::remove_dir_all(&base);
        }
        std::fs::create_dir_all(&base).expect("create test home");
        std::env::set_var("HOME", &base);
        #[cfg(windows)]
        std::env::set_var("USERPROFILE", &base);
        base
    })
    .as_path()
}

fn reset_test_fs() {
    let home = ensure_test_home();
    for sub in [".claude", ".codex", ".cc-switch"] {
        let path = home.join(sub);
        if path.exists() {
            if let Err(err) = fs::remove_dir_all(&path) {
                eprintln!("failed to clean {}: {}", path.display(), err);
            }
        }
    }
    let claude_json = home.join(".claude.json");
    if claude_json.exists() {
        let _ = fs::remove_file(&claude_json);
    }
    // 重置内存中的设置缓存，确保测试环境不受上一次调用影响
    // 写入默认设置即可刷新 OnceLock 中的缓存数据
    let _ = update_settings(AppSettings::default());
}

fn test_mutex() -> &'static Mutex<()> {
    static MUTEX: OnceLock<Mutex<()>> = OnceLock::new();
    MUTEX.get_or_init(|| Mutex::new(()))
}

#[test]
fn sync_claude_provider_writes_live_settings() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let home = ensure_test_home();

    let mut config = MultiAppConfig::default();
    let provider_config = json!({
        "env": {
            "ANTHROPIC_AUTH_TOKEN": "test-key",
            "ANTHROPIC_BASE_URL": "https://api.test"
        },
        "ui": {
            "displayName": "Test Provider"
        }
    });

    let provider = Provider::with_id(
        "prov-1".to_string(),
        "Test Claude".to_string(),
        provider_config.clone(),
        None,
    );

    let manager = config
        .get_manager_mut(&AppType::Claude)
        .expect("claude manager");
    manager.providers.insert("prov-1".to_string(), provider);
    manager.current = "prov-1".to_string();

    sync_current_providers_to_live(&mut config).expect("sync live settings");

    let settings_path = get_claude_settings_path();
    assert!(
        settings_path.exists(),
        "live settings should be written to {}",
        settings_path.display()
    );

    let live_value: serde_json::Value = read_json_file(&settings_path).expect("read live file");
    assert_eq!(live_value, provider_config);

    // 确认 SSOT 中的供应商也同步了最新内容
    let updated = config
        .get_manager(&AppType::Claude)
        .and_then(|m| m.providers.get("prov-1"))
        .expect("provider in config");
    assert_eq!(updated.settings_config, provider_config);

    // 额外确认写入位置位于测试 HOME 下
    assert!(
        settings_path.starts_with(home),
        "settings path {:?} should reside under test HOME {:?}",
        settings_path,
        home
    );
}

#[test]
fn sync_codex_provider_writes_auth_and_config() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();

    let mut config = MultiAppConfig::default();

    // 添加入测 MCP 启用项，确保 sync_enabled_to_codex 会写入 TOML
    config
        .mcp
        .codex
        .servers
        .insert(
            "echo-server".into(),
            json!({
                "id": "echo-server",
                "enabled": true,
                "server": {
                    "type": "stdio",
                    "command": "echo",
                    "args": ["hello"]
                }
            }),
        );

    let provider_config = json!({
        "auth": {
            "OPENAI_API_KEY": "codex-key"
        },
        "config": r#"base_url = "https://codex.test""#
    });

    let provider = Provider::with_id(
        "codex-1".to_string(),
        "Codex Test".to_string(),
        provider_config.clone(),
        None,
    );

    let manager = config
        .get_manager_mut(&AppType::Codex)
        .expect("codex manager");
    manager.providers.insert("codex-1".to_string(), provider);
    manager.current = "codex-1".to_string();

    sync_current_providers_to_live(&mut config).expect("sync codex live");

    let auth_path = cc_switch_lib::get_codex_auth_path();
    let config_path = cc_switch_lib::get_codex_config_path();

    assert!(
        auth_path.exists(),
        "auth.json should exist at {}",
        auth_path.display()
    );
    assert!(
        config_path.exists(),
        "config.toml should exist at {}",
        config_path.display()
    );

    let auth_value: serde_json::Value = read_json_file(&auth_path).expect("read auth");
    assert_eq!(
        auth_value,
        provider_config.get("auth").cloned().expect("auth object")
    );

    let toml_text = fs::read_to_string(&config_path).expect("read config.toml");
    assert!(
        toml_text.contains("command = \"echo\""),
        "config.toml should contain serialized enabled MCP server"
    );

    // 当前供应商应同步最新 config 文本
    let manager = config
        .get_manager(&AppType::Codex)
        .expect("codex manager");
    let synced = manager.providers.get("codex-1").expect("codex provider");
    let synced_cfg = synced
        .settings_config
        .get("config")
        .and_then(|v| v.as_str())
        .expect("config string");
    assert_eq!(synced_cfg, toml_text);
}

#[test]
fn sync_enabled_to_codex_writes_enabled_servers() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();

    let mut config = MultiAppConfig::default();
    config
        .mcp
        .codex
        .servers
        .insert(
            "stdio-enabled".into(),
            json!({
                "id": "stdio-enabled",
                "enabled": true,
                "server": {
                    "type": "stdio",
                    "command": "echo",
                    "args": ["ok"],
                }
            }),
        );

    cc_switch_lib::sync_enabled_to_codex(&config).expect("sync codex");

    let path = cc_switch_lib::get_codex_config_path();
    assert!(path.exists(), "config.toml should be created");
    let text = fs::read_to_string(&path).expect("read config.toml");
    assert!(
        text.contains("mcp_servers") && text.contains("stdio-enabled"),
        "enabled servers should be serialized"
    );
}

#[test]
fn sync_enabled_to_codex_removes_servers_when_none_enabled() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let path = cc_switch_lib::get_codex_config_path();
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent).expect("create codex dir");
    }
    fs::write(
        &path,
        r#"[mcp_servers]
disabled = { type = "stdio", command = "noop" }
"#,
    )
    .expect("seed config file");

    let config = MultiAppConfig::default(); // 无启用项
    cc_switch_lib::sync_enabled_to_codex(&config).expect("sync codex");

    let text = fs::read_to_string(&path).expect("read config.toml");
    assert!(
        !text.contains("mcp_servers") && !text.contains("servers"),
        "disabled entries should be removed from config.toml"
    );
}

#[test]
fn sync_enabled_to_codex_returns_error_on_invalid_toml() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let path = cc_switch_lib::get_codex_config_path();
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent).expect("create codex dir");
    }
    fs::write(&path, "invalid = [").expect("write invalid config");

    let mut config = MultiAppConfig::default();
    config.mcp.codex.servers.insert(
        "broken".into(),
        json!({
            "id": "broken",
            "enabled": true,
            "server": {
                "type": "stdio",
                "command": "echo"
            }
        }),
    );

    let err = cc_switch_lib::sync_enabled_to_codex(&config).expect_err("sync should fail");
    match err {
        cc_switch_lib::AppError::Toml { path, .. } => {
            assert!(path.ends_with("config.toml"), "path should reference config.toml");
        }
        cc_switch_lib::AppError::McpValidation(msg) => {
            assert!(msg.contains("config.toml"), "error message should mention config.toml");
        }
        other => panic!("unexpected error: {other:?}"),
    }
}

#[test]
fn import_from_codex_adds_servers_from_mcp_servers_table() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let path = cc_switch_lib::get_codex_config_path();
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent).expect("create codex dir");
    }
    fs::write(
        &path,
        r#"[mcp_servers.echo_server]
type = "stdio"
command = "echo"
args = ["hello"]

[mcp_servers.http_server]
type = "http"
url = "https://example.com"
"#,
    )
    .expect("write codex config");

    let mut config = MultiAppConfig::default();
    let changed = cc_switch_lib::import_from_codex(&mut config).expect("import codex");
    assert!(changed >= 2, "should import both servers");

    let servers = &config.mcp.codex.servers;
    let echo = servers.get("echo_server").and_then(|v| v.as_object()).expect("echo server");
    assert_eq!(echo.get("enabled").and_then(|v| v.as_bool()), Some(true));
    let server_spec = echo.get("server").and_then(|v| v.as_object()).expect("server spec");
    assert_eq!(
        server_spec.get("command").and_then(|v| v.as_str()).unwrap_or(""),
        "echo"
    );

    let http = servers.get("http_server").and_then(|v| v.as_object()).expect("http server");
    let http_spec = http.get("server").and_then(|v| v.as_object()).expect("http spec");
    assert_eq!(
        http_spec.get("url").and_then(|v| v.as_str()).unwrap_or(""),
        "https://example.com"
    );
}

#[test]
fn import_from_codex_merges_into_existing_entries() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let path = cc_switch_lib::get_codex_config_path();
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent).expect("create codex dir");
    }
    fs::write(
        &path,
        r#"[mcp.servers.existing]
type = "stdio"
command = "echo"
"#,
    )
    .expect("write codex config");

    let mut config = MultiAppConfig::default();
    config
        .mcp
        .codex
        .servers
        .insert(
            "existing".into(),
            json!({
                "id": "existing",
                "name": "existing",
                "enabled": false,
                "server": {
                    "type": "stdio",
                    "command": "prev"
                }
            }),
        );

    let changed = cc_switch_lib::import_from_codex(&mut config).expect("import codex");
    assert!(changed >= 1, "should mark change for enabled flag");

    let entry = config
        .mcp
        .codex
        .servers
        .get("existing")
        .and_then(|v| v.as_object())
        .expect("existing entry");
    assert_eq!(entry.get("enabled").and_then(|v| v.as_bool()), Some(true));
    let spec = entry.get("server").and_then(|v| v.as_object()).expect("server spec");
    // 保留原 command，确保导入不会覆盖现有 server 细节
    assert_eq!(spec.get("command").and_then(|v| v.as_str()), Some("prev"));
}

#[test]
fn sync_claude_enabled_mcp_projects_to_user_config() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let mut config = MultiAppConfig::default();

    config.mcp.claude.servers.insert(
        "stdio-enabled".into(),
        json!({
            "id": "stdio-enabled",
            "enabled": true,
            "server": {
                "type": "stdio",
                "command": "echo",
                "args": ["hi"],
            }
        }),
    );
    config.mcp.claude.servers.insert(
        "http-disabled".into(),
        json!({
            "id": "http-disabled",
            "enabled": false,
            "server": {
                "type": "http",
                "url": "https://example.com",
            }
        }),
    );

    cc_switch_lib::sync_enabled_to_claude(&config).expect("sync Claude MCP");

    let claude_path = cc_switch_lib::get_claude_mcp_path();
    assert!(claude_path.exists(), "claude config should exist");
    let text = fs::read_to_string(&claude_path).expect("read .claude.json");
    let value: serde_json::Value = serde_json::from_str(&text).expect("parse claude json");
    let servers = value
        .get("mcpServers")
        .and_then(|v| v.as_object())
        .expect("mcpServers map");
    assert_eq!(servers.len(), 1, "only enabled entries should be written");
    let enabled = servers.get("stdio-enabled").expect("enabled entry");
    assert_eq!(
        enabled
            .get("command")
            .and_then(|v| v.as_str())
            .unwrap_or_default(),
        "echo"
    );
    assert!(servers.get("http-disabled").is_none());
}

#[test]
fn import_from_claude_merges_into_config() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let home = ensure_test_home();
    let claude_path = home.join(".claude.json");

    fs::write(
        &claude_path,
        serde_json::to_string_pretty(&json!({
            "mcpServers": {
                "stdio-enabled": {
                    "type": "stdio",
                    "command": "echo",
                    "args": ["hello"]
                }
            }
        }))
        .unwrap(),
    )
    .expect("write claude json");

    let mut config = MultiAppConfig::default();
    config
        .mcp
        .claude
        .servers
        .insert("stdio-enabled".into(), json!({
            "id": "stdio-enabled",
            "name": "stdio-enabled",
            "enabled": false,
            "server": {
                "type": "stdio",
                "command": "prev"
            }
        }));

    let changed = cc_switch_lib::import_from_claude(&mut config).expect("import from claude");
    assert!(changed >= 1, "should mark at least one change");

    let entry = config
        .mcp
        .claude
        .servers
        .get("stdio-enabled")
        .and_then(|v| v.as_object())
        .expect("entry exists");
    assert_eq!(entry.get("enabled").and_then(|v| v.as_bool()), Some(true));
    let server = entry.get("server").and_then(|v| v.as_object()).expect("server obj");
    assert_eq!(
        server.get("command").and_then(|v| v.as_str()).unwrap_or(""),
        "prev",
        "existing server config should be preserved"
    );
}

#[test]
fn create_backup_skips_missing_file() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let home = ensure_test_home();
    let config_path = home.join(".cc-switch").join("config.json");

    // 未创建文件时应返回空字符串，不报错
    let result = create_backup(&config_path).expect("create backup");
    assert!(
        result.is_empty(),
        "expected empty backup id when config file missing"
    );
}

#[test]
fn create_backup_generates_snapshot_file() {
    let _guard = test_mutex().lock().expect("acquire test mutex");
    reset_test_fs();
    let home = ensure_test_home();
    let config_dir = home.join(".cc-switch");
    let config_path = config_dir.join("config.json");
    fs::create_dir_all(&config_dir).expect("prepare config dir");
    fs::write(&config_path, r#"{"version":2}"#).expect("write config file");

    let backup_id = create_backup(&config_path).expect("backup success");
    assert!(
        !backup_id.is_empty(),
        "backup id should contain timestamp information"
    );

    let backup_path = config_dir.join("backups").join(format!("{backup_id}.json"));
    assert!(
        backup_path.exists(),
        "expected backup file at {}",
        backup_path.display()
    );

    let backup_content = fs::read_to_string(&backup_path).expect("read backup");
    assert!(
        backup_content.contains(r#""version":2"#),
        "backup content should match original config"
    );
}