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use serde::{Deserialize, Serialize};
use std::{
    fs,
    net::{Ipv4Addr, SocketAddr},
    path::PathBuf,
};
use tracing::warn;

#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
#[allow(clippy::upper_case_acronyms)]
pub enum ShutdownSignal {
    SIGUSR1,
    SIGUSR2,
    SIGTERM,
}

impl ShutdownSignal {
    #[cfg(any(target_os = "linux", target_os = "macos"))]
    pub fn to_signal(self) -> core::ffi::c_int {
        match self {
            Self::SIGUSR1 => signal_hook::consts::SIGUSR1,
            Self::SIGUSR2 => signal_hook::consts::SIGUSR2,
            Self::SIGTERM => signal_hook::consts::SIGTERM,
        }
    }
}

#[derive(Clone, Debug, Serialize, Deserialize)]
#[serde(default)]
pub struct Settings {
    pub update_shutdown_grace_period_secs: u32,
    pub update_shutdown_message: String,
    pub web_address: SocketAddr,
    /// SECRET API HEADER used to access the chat api, if disabled the API is
    /// unreachable
    pub web_chat_secret: Option<String>,
    /// public SECRET API HEADER used to access the /ui_api, if disabled the API
    /// is reachable localhost only (by /ui)
    pub ui_api_secret: Option<String>,
    pub shutdown_signals: Vec<ShutdownSignal>,
}

impl Default for Settings {
    fn default() -> Self {
        Self {
            update_shutdown_grace_period_secs: 120,
            update_shutdown_message: "The server is restarting for an update".to_owned(),
            web_address: SocketAddr::from((Ipv4Addr::LOCALHOST, 14005)),
            web_chat_secret: None,
            ui_api_secret: None,
            shutdown_signals: if cfg!(any(target_os = "linux", target_os = "macos")) {
                vec![ShutdownSignal::SIGUSR1]
            } else {
                Vec::new()
            },
        }
    }
}

impl Settings {
    pub fn load() -> Self {
        let path = Self::get_settings_path();

        if let Ok(file) = fs::File::open(&path) {
            match ron::de::from_reader(file) {
                Ok(s) => return s,
                Err(e) => {
                    warn!(?e, "Failed to parse setting file! Fallback to default.");
                    // Rename the corrupted settings file
                    let mut new_path = path.to_owned();
                    new_path.pop();
                    new_path.push("settings.invalid.ron");
                    if let Err(e) = fs::rename(&path, &new_path) {
                        warn!(?e, ?path, ?new_path, "Failed to rename settings file.");
                    }
                },
            }
        }
        // This is reached if either:
        // - The file can't be opened (presumably it doesn't exist)
        // - Or there was an error parsing the file
        let default_settings = Self::default();
        default_settings.save_to_file_warn();
        default_settings
    }

    fn save_to_file_warn(&self) {
        if let Err(e) = self.save_to_file() {
            warn!(?e, "Failed to save settings");
        }
    }

    fn save_to_file(&self) -> std::io::Result<()> {
        let path = Self::get_settings_path();
        if let Some(dir) = path.parent() {
            fs::create_dir_all(dir)?;
        }

        let ron = ron::ser::to_string_pretty(self, ron::ser::PrettyConfig::default()).unwrap();
        fs::write(path, ron.as_bytes())
    }

    pub fn get_settings_path() -> PathBuf {
        let mut path = data_dir();
        path.push("settings.ron");
        path
    }
}

pub fn data_dir() -> PathBuf {
    let mut path = common_base::userdata_dir_workspace!();
    path.push("server-cli");
    path
}