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use serde::Deserialize;

#[doc(hidden)]
fn default_hostname() -> String {
    "0.0.0.0".to_string()
}

#[doc(hidden)]
const fn default_port() -> u16 {
    2875
}

#[doc(hidden)]
fn default_database_url() -> String {
    "postgres://autopulse:autopulse@localhost:5432/autopulse".to_string()
}

#[doc(hidden)]
fn default_log_level() -> LogLevel {
    LogLevel::default()
}

#[derive(Clone, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum LogLevel {
    Trace,
    Debug,
    #[default]
    Info,
    Warn,
    Error,
}

impl std::fmt::Display for LogLevel {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match self {
            Self::Trace => write!(f, "trace"),
            Self::Debug => write!(f, "debug"),
            Self::Info => write!(f, "info"),
            Self::Warn => write!(f, "warn"),
            Self::Error => write!(f, "error"),
        }
    }
}

impl std::str::FromStr for LogLevel {
    type Err = String;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "trace" => Ok(Self::Trace),
            "debug" => Ok(Self::Debug),
            "info" => Ok(Self::Info),
            "warn" => Ok(Self::Warn),
            "error" => Ok(Self::Error),
            _ => Err("Invalid log level".to_string()),
        }
    }
}

#[derive(Deserialize, Clone)]
pub struct App {
    /// Hostname to bind to, (default: 0.0.0.0)
    #[serde(default = "default_hostname")]
    pub hostname: String,
    /// Port to bind to (default: 2875)
    #[serde(default = "default_port")]
    pub port: u16,
    /// Database URL (see [AnyConnection](crate::db::conn::AnyConnection))
    #[serde(default = "default_database_url")]
    pub database_url: String,
    /// Log level (default: info) (trace, debug, info, warn, error)
    #[serde(default = "default_log_level")]
    pub log_level: LogLevel,
}

impl Default for App {
    fn default() -> Self {
        Self {
            hostname: default_hostname(),
            port: default_port(),
            database_url: default_database_url(),
            log_level: default_log_level(),
        }
    }
}