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//

use std::{
    collections::BTreeMap,
    net::SocketAddr,
    path::{Path, PathBuf},
    str::FromStr,
};

use kxio::fs::FileSystem;
use tracing::info;

use crate::{newtype, ForgeAlias, ForgeConfig, RepoAlias};

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("fs: {0}")]
    KxioFs(#[from] kxio::fs::Error),

    #[error("deserialise toml: {0}")]
    TomlDe(#[from] toml::de::Error),

    #[error("parse IP addres/port: {0}")]
    AddressParse(#[from] std::net::AddrParseError),
}

type Result<T> = core::result::Result<T, Error>;

/// Mapped from the `git-next-server.toml` file
#[derive(
    Clone,
    Debug,
    derive_more::From,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    derive_more::AsRef,
    serde::Deserialize,
    derive_more::Constructor,
)]
pub struct ServerConfig {
    http: Http,
    webhook: Webhook,
    storage: ServerStorage,
    pub forge: BTreeMap<String, ForgeConfig>,
}
impl ServerConfig {
    #[tracing::instrument(skip_all)]
    pub fn load(fs: &FileSystem) -> Result<Self> {
        let file = fs.base().join("git-next-server.toml");
        info!(?file, "");
        let str = fs.file_read_to_string(&file)?;
        Ok(toml::from_str(&str)?)
    }

    pub fn forges(&self) -> impl Iterator<Item = (ForgeAlias, &ForgeConfig)> {
        self.forge
            .iter()
            .map(|(alias, forge)| (ForgeAlias::new(alias.clone()), forge))
    }

    pub const fn storage(&self) -> &ServerStorage {
        &self.storage
    }

    pub const fn webhook(&self) -> &Webhook {
        &self.webhook
    }

    pub fn http(&self) -> Result<SocketAddr> {
        self.http.socket_addr()
    }
}

/// Defines the port the server will listen to for incoming webhooks messages
#[derive(
    Clone,
    Debug,
    derive_more::From,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    derive_more::AsRef,
    serde::Deserialize,
    derive_more::Constructor,
)]
pub struct Http {
    addr: String,
    port: u16,
}
impl Http {
    fn socket_addr(&self) -> Result<SocketAddr> {
        Ok(SocketAddr::from_str(&format!(
            "{}:{}",
            self.addr, self.port
        ))?)
    }
}

/// Defines the Webhook Forges should send updates to
/// Must be an address that is accessible from the remote forge
#[derive(
    Clone,
    Debug,
    derive_more::From,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    derive_more::AsRef,
    serde::Deserialize,
    derive_more::Constructor,
)]
pub struct Webhook {
    url: String,
}
impl Webhook {
    pub fn url(&self, forge_alias: &ForgeAlias, repo_alias: &RepoAlias) -> WebhookUrl {
        let base_url = &self.url;
        WebhookUrl(format!("{base_url}/{forge_alias}/{repo_alias}"))
    }
    pub fn base_url(&self) -> &str {
        &self.url
    }
}

newtype!(WebhookUrl: String, serde::Serialize: "The URL for the webhook where forges should send their updates");

/// The directory to store server data, such as cloned repos
#[derive(
    Clone,
    Debug,
    derive_more::From,
    PartialEq,
    Eq,
    PartialOrd,
    Ord,
    derive_more::AsRef,
    serde::Deserialize,
    derive_more::Constructor,
)]
pub struct ServerStorage {
    path: PathBuf,
}
impl ServerStorage {
    pub fn path(&self) -> &Path {
        self.path.as_path()
    }
}