pub mod google;
pub mod wechat; // not yet implemented — placeholder for future WeChat integration

use serde::{Deserialize, Serialize};

/// Normalized OAuth user profile from any provider.
#[derive(Debug, Clone)]
pub struct OAuthUserInfo {
    pub provider: String,
    pub provider_id: String,
    pub email: Option<String>,
    pub name: Option<String>,
    pub avatar_url: Option<String>,
}

/// OAuth provider configuration.
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct OAuthConfig {
    pub client_id: String,
    pub client_secret: String,
    pub redirect_uri: String,
}

/// Build the Google authorization URL.
pub fn google_auth_url(config: &OAuthConfig, state: &str) -> String {
    format!(
        "https://accounts.google.com/o/oauth2/v2/auth\
         ?client_id={}\
         &redirect_uri={}\
         &response_type=code\
         &scope=openid%20email%20profile\
         &state={}\
         &access_type=offline",
        urlencoding::encode(&config.client_id),
        urlencoding::encode(&config.redirect_uri),
        urlencoding::encode(state),
    )
}

pub fn random_state() -> String {
    use rand::RngExt;
    let mut bytes = [0u8; 16];
    rand::rng().fill(&mut bytes);
    bytes.iter().map(|b| format!("{:02x}", b)).collect()
}