use std::net::IpAddr;

use config::{Config, ConfigError};
use tracing::warn;

use crate::configs::key::{SERVER_CORS_ALLOWED_ORIGINS_KEY, SERVER_SERVE_OPENAPI_KEY};

use super::{
    FromConfig,
    key::{SERVER_ADDRESS_KEY, SERVER_PORT_KEY},
};

#[derive(Debug, Clone)]
pub struct ServerSettings {
    pub address: IpAddr,
    pub port: u16,
    pub serve_openapi: bool,
    pub cors: CORSSettings,
}

#[derive(Debug, Clone)]
pub struct CORSSettings {
    pub allowed_origins: Vec<String>,
}

impl FromConfig for ServerSettings {
    fn from_config(_config: &Config) -> Result<Self, String> {
        Ok(ServerSettings {
            address: _config
                .get_string(SERVER_ADDRESS_KEY)
                .unwrap_or_else(|err| {
                    const DEFAULT_ADDRESS: &str = "0.0.0.0";
                    match err {
                        ConfigError::NotFound(_) => {}
                        _ => {
                            warn!(
                                "Failed to read {} from configuration, defaulting to {}. Error: {}",
                                SERVER_ADDRESS_KEY, DEFAULT_ADDRESS, err
                            );
                        }
                    };
                    DEFAULT_ADDRESS.to_string()
                })
                .parse()
                .map_err(|e| format!("Invalid {} in configuration: {}", SERVER_ADDRESS_KEY, e))?,

            port: _config.get_int(SERVER_PORT_KEY).unwrap_or_else(|err| {
                const DEFAULT_PORT: i64 = 8080;
                warn!(
                    "{} not set or invalid in configuration, defaulting to {}. Error: {}",
                    SERVER_PORT_KEY, DEFAULT_PORT, err
                );
                DEFAULT_PORT
            }) as u16,

            serve_openapi: _config
                .get_bool(SERVER_SERVE_OPENAPI_KEY)
                .unwrap_or_else(|err| {
                    const DEFAULT_SERVE_OPENAPI: bool = false;
                    warn!(
                        "{} not set or invalid in configuration, defaulting to {}. Error: {}",
                        SERVER_SERVE_OPENAPI_KEY, DEFAULT_SERVE_OPENAPI, err
                    );
                    DEFAULT_SERVE_OPENAPI
                }),

            cors: CORSSettings {
                allowed_origins: _config
                    .get_array(SERVER_CORS_ALLOWED_ORIGINS_KEY)
                    .unwrap_or_else(|_| vec![])
                    .into_iter()
                    .filter_map(|val| match val.into_string() {
                        Ok(s) => Some(s),
                        Err(e) => {
                            warn!(
                                "Invalid origin in {} configuration: {}",
                                SERVER_CORS_ALLOWED_ORIGINS_KEY, e
                            );
                            None
                        }
                    })
                    .collect(),
            },
        })
    }

    fn validate(&self) -> Result<(), String> {
        #[allow(clippy::absurd_extreme_comparisons, unused_comparisons)]
        if self.port == 0 || self.port > 65535 {
            return Err("Server port must be between 1 and 65535".into());
        }
        Ok(())
    }
}