use serde::Deserialize;
use std::collections::HashMap;

#[derive(Debug, Clone, Deserialize)]
pub struct Config {
    pub server: ServerConfig,
    pub database: DatabaseConfig,
    pub auth: AuthConfig,
    #[serde(default)]
    pub oidc: Vec<OidcProviderConfig>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct ServerConfig {
    #[serde(default = "default_bind")]
    pub bind: String,
    #[serde(default = "default_base_url")]
    pub base_url: String,
    #[serde(default)]
    pub allowed_origins: Vec<String>,
    #[serde(default)]
    pub static_dir: Option<String>,
}

#[derive(Debug, Clone, Deserialize)]
pub struct DatabaseConfig {
    pub url: String,
    #[serde(default = "default_max_connections")]
    pub max_connections: u32,
}

#[derive(Debug, Clone, Deserialize)]
pub struct AuthConfig {
    #[serde(default = "default_session_ttl_minutes")]
    pub session_ttl_minutes: i64,
    #[serde(default)]
    pub cookie_domain: Option<String>,
    #[serde(default = "default_cookie_secure")]
    pub cookie_secure: bool,
    #[serde(default)]
    pub bootstrap_admin_email: Option<String>,
    #[serde(default)]
    pub bootstrap_admin_password: Option<String>,
    #[serde(default = "default_allow_user_signup")]
    pub allow_user_signup: bool,
}

#[derive(Debug, Clone, Deserialize)]
pub struct OidcProviderConfig {
    pub id: String,
    pub name: String,
    pub issuer_url: String,
    pub client_id: String,
    pub client_secret: String,
    #[serde(default)]
    pub scopes: Vec<String>,
    #[serde(default)]
    pub extra_params: HashMap<String, String>,
}

impl Config {
    pub fn load() -> Result<Self, config::ConfigError> {
        let settings = config::Config::builder()
            .add_source(config::File::with_name("config").required(false))
            .add_source(config::Environment::with_prefix("LS_ADMIN").separator("__"))
            .build()?;
        settings.try_deserialize()
    }
}

fn default_bind() -> String {
    "0.0.0.0:8081".to_string()
}

fn default_base_url() -> String {
    "http://localhost:8081".to_string()
}

fn default_max_connections() -> u32 {
    20
}

fn default_session_ttl_minutes() -> i64 {
    720
}

fn default_cookie_secure() -> bool {
    false
}

fn default_allow_user_signup() -> bool {
    false
}