clauth 0.1.6

A simple Claude Code account switcher - swap OAuth and API profiles in an instant
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use anyhow::{Context, Result};
use serde::{Deserialize, Serialize};
use std::path::PathBuf;

use crate::usage::UsageInfo;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub(crate) struct ClaudeCredentials {
    #[serde(rename = "claudeAiOauth", skip_serializing_if = "Option::is_none")]
    pub(crate) claude_ai_oauth: Option<OAuthToken>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub(crate) struct OAuthToken {
    #[serde(rename = "accessToken")]
    pub(crate) access_token: String,
    #[serde(rename = "refreshToken", skip_serializing_if = "Option::is_none")]
    pub(crate) refresh_token: Option<String>,
    #[serde(rename = "expiresAt", skip_serializing_if = "Option::is_none")]
    pub(crate) expires_at: Option<i64>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub(crate) scopes: Option<Vec<String>>,
    #[serde(rename = "subscriptionType", skip_serializing_if = "Option::is_none")]
    pub(crate) subscription_type: Option<String>,
}

#[derive(Debug, Clone)]
pub(crate) struct Profile {
    pub(crate) name: String,
    pub(crate) base_url: Option<String>,
    pub(crate) api_key: Option<String>,
    /// When true, clauth fires a 1-token Haiku ping at startup if this
    /// profile has no active 5h window. Mirrors what Claude Code does on
    /// launch; opt-in because it consumes a (tiny) amount of usage.
    pub(crate) kick_timer: bool,
    pub(crate) credentials: Option<ClaudeCredentials>,
    pub(crate) usage: Option<UsageInfo>,
}

impl Profile {
    pub(crate) fn new(name: String, base_url: Option<String>, api_key: Option<String>) -> Self {
        Self {
            name,
            base_url,
            api_key,
            kick_timer: false,
            credentials: None,
            usage: None,
        }
    }
}

/// Stored at ~/.clauth/profiles.toml — ordering and active marker only.
/// Credentials and endpoint config live in per-profile subdirectories.
#[derive(Debug, Serialize, Deserialize, Default)]
pub(crate) struct AppState {
    pub(crate) active_profile: Option<String>,
    pub(crate) profiles: Vec<String>,
}

pub(crate) struct AppConfig {
    pub(crate) state: AppState,
    pub(crate) profiles: Vec<Profile>,
}

impl AppConfig {
    pub(crate) fn is_active(&self, name: &str) -> bool {
        self.state.active_profile.as_deref() == Some(name)
    }

    pub(crate) fn find(&self, name: &str) -> Option<&Profile> {
        self.profiles.iter().find(|p| p.name == name)
    }

    pub(crate) fn find_mut(&mut self, name: &str) -> Option<&mut Profile> {
        self.profiles.iter_mut().find(|p| p.name == name)
    }

    pub(crate) fn names(&self) -> Vec<&str> {
        self.profiles.iter().map(|p| p.name.as_str()).collect()
    }

    pub(crate) fn add(&mut self, profile: Profile) {
        self.state.profiles.push(profile.name.clone());
        self.profiles.push(profile);
    }

    pub(crate) fn remove(&mut self, name: &str) {
        self.profiles.retain(|p| p.name != name);
        self.state.profiles.retain(|n| n != name);
        if self.is_active(name) {
            self.state.active_profile = None;
        }
    }
}

/// On-disk format for ~/.clauth/profiles/<name>/config.toml
#[derive(Debug, Serialize, Deserialize, Default)]
struct ProfileConfig {
    base_url: Option<String>,
    api_key: Option<String>,
    #[serde(default)]
    kick_timer: bool,
}

/// Hand-rolled TOML writer that keeps every option visible — set values are
/// uncommented, unset ones stay as commented examples so users can discover
/// what's available without consulting the README.
fn render_config_toml(profile: &Profile) -> String {
    fn toml_str(s: &str) -> String {
        toml::Value::String(s.to_string()).to_string()
    }

    let mut out = String::from("# clauth profile configuration\n\n");

    out.push_str("# Base URL for an API-endpoint profile. Leave commented for an OAuth\n");
    out.push_str("# (Pro / Max / Team / Enterprise) profile.\n");
    match profile.base_url.as_deref() {
        Some(v) => out.push_str(&format!("base_url = {}\n", toml_str(v))),
        None => out.push_str("# base_url = \"https://api.anthropic.com\"\n"),
    }
    out.push('\n');

    out.push_str("# API key for the endpoint. Only used when base_url is set.\n");
    match profile.api_key.as_deref() {
        Some(v) => out.push_str(&format!("api_key = {}\n", toml_str(v))),
        None => out.push_str("# api_key = \"sk-ant-...\"\n"),
    }
    out.push('\n');

    out.push_str("# Fire a 1-token Haiku ping at startup to start the 5-hour usage\n");
    out.push_str("# window when this profile has no running window. Costs ~0.001¢ per\n");
    out.push_str("# kick. OAuth profiles only.\n");
    if profile.kick_timer {
        out.push_str("kick_timer = true\n");
    } else {
        out.push_str("# kick_timer = true\n");
    }

    out
}

// ── Path helpers ──────────────────────────────────────────────────────────────

pub(crate) fn home_dir() -> Result<PathBuf> {
    dirs::home_dir().context("Cannot determine home directory")
}

fn clauth_dir() -> Result<PathBuf> {
    Ok(home_dir()?.join(".clauth"))
}

fn profiles_root() -> Result<PathBuf> {
    Ok(clauth_dir()?.join("profiles"))
}

fn app_state_path() -> Result<PathBuf> {
    Ok(clauth_dir()?.join("profiles.toml"))
}

pub(crate) fn profile_dir(name: &str) -> Result<PathBuf> {
    Ok(profiles_root()?.join(name))
}

fn profile_config_path(name: &str) -> Result<PathBuf> {
    Ok(profile_dir(name)?.join("config.toml"))
}

fn profile_credentials_path(name: &str) -> Result<PathBuf> {
    Ok(profile_dir(name)?.join("credentials.json"))
}

// ── Persistence ───────────────────────────────────────────────────────────────

fn load_app_state() -> Result<AppState> {
    let path = app_state_path()?;
    if !path.exists() {
        return Ok(AppState::default());
    }
    let content = std::fs::read_to_string(&path).context("Failed to read profiles.toml")?;
    toml::from_str(&content).context("Failed to parse profiles.toml")
}

pub(crate) fn save_app_state(state: &AppState) -> Result<()> {
    std::fs::create_dir_all(clauth_dir()?)?;
    std::fs::write(app_state_path()?, toml::to_string_pretty(state)?)
        .context("Failed to write profiles.toml")
}

fn load_profile(name: &str) -> Result<Profile> {
    let config_path = profile_config_path(name)?;
    let raw_config = std::fs::read_to_string(&config_path).unwrap_or_default();
    let config: ProfileConfig = if raw_config.trim().is_empty() {
        ProfileConfig::default()
    } else {
        toml::from_str(&raw_config)
            .with_context(|| format!("Failed to parse {name}/config.toml"))?
    };

    let cred_path = profile_credentials_path(name)?;
    let credentials = if cred_path.exists() {
        let content = std::fs::read_to_string(&cred_path)
            .with_context(|| format!("Failed to read {name}/credentials.json"))?;
        Some(
            serde_json::from_str(&content)
                .with_context(|| format!("Failed to parse {name}/credentials.json"))?,
        )
    } else {
        None
    };

    let profile = Profile {
        name: name.to_string(),
        base_url: config.base_url,
        api_key: config.api_key,
        kick_timer: config.kick_timer,
        credentials,
        usage: None,
    };

    // Keep config.toml in sync with the canonical template: missing options
    // get added as comments, values already set are preserved in place.
    let rendered = render_config_toml(&profile);
    if raw_config != rendered {
        if let Some(parent) = config_path.parent() {
            let _ = std::fs::create_dir_all(parent);
        }
        let _ = std::fs::write(&config_path, &rendered);
    }

    Ok(profile)
}

pub(crate) fn save_profile(profile: &Profile) -> Result<()> {
    std::fs::create_dir_all(profile_dir(&profile.name)?)?;

    std::fs::write(
        profile_config_path(&profile.name)?,
        render_config_toml(profile),
    )
    .context("Failed to write config.toml")?;

    let cred_path = profile_credentials_path(&profile.name)?;
    match &profile.credentials {
        Some(creds) => std::fs::write(&cred_path, serde_json::to_string_pretty(creds)?)
            .context("Failed to write credentials.json")?,
        None if cred_path.exists() => {
            std::fs::remove_file(&cred_path).context("Failed to remove credentials.json")?
        }
        None => {}
    }

    Ok(())
}

pub(crate) fn load_config() -> Result<AppConfig> {
    std::fs::create_dir_all(profiles_root()?)?;
    let state = load_app_state()?;
    let profiles = state
        .profiles
        .iter()
        .map(|n| load_profile(n))
        .collect::<Result<Vec<_>>>()?;
    Ok(AppConfig { state, profiles })
}