use std::{
    collections::HashMap,
    fmt::{Display, Formatter},
};

use serde::Deserialize;
use terrors::OneOf;

use crate::filesystem::FileSystem;
#[derive(Debug, PartialEq, Eq, Deserialize)]
pub struct Config {
    forge: HashMap<String, Forge>,
}
impl Config {
    pub(crate) fn load(fs: &FileSystem) -> Result<Self, OneOf<(std::io::Error, toml::de::Error)>> {
        let str = fs.read_file("git-next-server.toml").map_err(OneOf::new)?;
        toml::from_str(&str).map_err(OneOf::new)
    }

    pub(crate) fn forges(&self) -> impl Iterator<Item = (ForgeName, &Forge)> {
        self.forge
            .iter()
            .map(|(name, forge)| (ForgeName(name.clone()), forge))
    }
}

#[derive(Debug, PartialEq, Eq, Deserialize)]
pub struct Forge {
    forge_type: ForgeType,
    hostname: String,
    user: String,
    // API Token
    // Private SSH Key Path
    repos: HashMap<String, Repo>,
}
impl Forge {
    pub const fn forge_type(&self) -> &ForgeType {
        &self.forge_type
    }

    pub fn hostname(&self) -> Hostname {
        Hostname(self.hostname.clone())
    }

    pub fn user(&self) -> User {
        User(self.user.clone())
    }

    pub fn repos(&self) -> impl Iterator<Item = (RepoName, &Repo)> {
        self.repos
            .iter()
            .map(|(name, repo)| (RepoName(name.clone()), repo))
    }
}

#[derive(Debug, PartialEq, Eq, Deserialize)]
pub struct Repo {
    repo: String,
    branch: String,
}
impl Repo {
    #[cfg(test)]
    pub fn new(repo: &str, branch: &str) -> Self {
        Self {
            repo: repo.to_string(),
            branch: branch.to_string(),
        }
    }
    #[allow(dead_code)]
    pub fn repo(&self) -> RepoPath {
        RepoPath(self.repo.clone())
    }

    #[allow(dead_code)]
    pub fn branch(&self) -> BranchName {
        BranchName(self.branch.clone())
    }
}
#[cfg(test)]
impl AsRef<Repo> for Repo {
    fn as_ref(&self) -> &Repo {
        self
    }
}
impl Display for Repo {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{} - {}", self.repo, self.branch)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ForgeName(pub String);
impl Display for ForgeName {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Hostname(pub String);
impl Display for Hostname {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct User(pub String);
impl Display for User {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ForgeDetails {
    pub name: ForgeName,
    pub forge_type: ForgeType,
    pub hostname: Hostname,
    pub user: User,
    // API Token
    // Private SSH Key Path
}
impl From<(&ForgeName, &Forge)> for ForgeDetails {
    fn from(forge: (&ForgeName, &Forge)) -> Self {
        Self {
            name: forge.0.clone(),
            forge_type: forge.1.forge_type.clone(),
            hostname: Hostname(forge.1.hostname.clone()),
            user: User(forge.1.user.clone()),
        }
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RepoName(pub String);
impl Display for RepoName {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RepoPath(pub String);
impl Display for RepoPath {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct BranchName(pub String);
impl Display for BranchName {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", self.0)
    }
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct RepoDetails {
    pub name: RepoName,
    pub repo: RepoPath,
    pub branch: BranchName,
    pub forge: ForgeDetails,
}
impl RepoDetails {
    pub fn new(name: &RepoName, repo: &Repo, forge_name: &ForgeName, forge: &Forge) -> Self {
        Self {
            name: name.clone(),
            repo: RepoPath(repo.repo.clone()),
            branch: BranchName(repo.branch.clone()),
            forge: ForgeDetails {
                name: forge_name.clone(),
                forge_type: forge.forge_type.clone(),
                hostname: Hostname(forge.hostname.clone()),
                user: User(forge.user.clone()),
            },
        }
    }
}
impl Display for RepoDetails {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(
            f,
            "{}/{} ({}): {}:{}/{} @ {}",
            self.forge.name,
            self.name,
            self.forge.forge_type,
            self.forge.hostname,
            self.forge.user,
            self.repo,
            self.branch,
        )
    }
}

#[derive(Clone, Debug, PartialEq, Eq, Deserialize)]
pub enum ForgeType {
    ForgeJo,
    // Gitea,
    // GitHub,
    // GitLab,
    // BitBucket,
}
impl Display for ForgeType {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        write!(f, "{:?}", self)
    }
}

#[cfg(test)]
mod tests {
    use assert2::let_assert;

    use crate::filesystem::FileSystem;

    use super::*;

    #[test]
    fn test_config_load() -> Result<(), OneOf<(std::io::Error, toml::de::Error)>> {
        let fs = FileSystem::new_temp().map_err(OneOf::new)?;
        fs.write_file(
            "git-next-server.toml",
            r#"
            [forge.default]
            forge_type = "ForgeJo"
            hostname = "git.example.net"
            user = "Bob"

            [forge.default.repos]
            hello = { repo = "user/hello", branch = "main" }
            world = { repo = "user/world", branch = "master" }
        "#,
        )
        .map_err(OneOf::new)?;
        let config = Config::load(&fs)?;
        let_assert!(Some(default) = config.forge.get("default"));
        assert_eq!(default.forge_type, ForgeType::ForgeJo);
        assert_eq!(default.hostname, "git.example.net".to_string());
        assert_eq!(default.user, "Bob".to_string());
        assert_eq!(
            default.repos.get("hello"),
            Some(Repo::new("user/hello", "main").as_ref())
        );
        assert_eq!(
            default.repos.get("world"),
            Some(Repo::new("user/world", "master").as_ref())
        );

        Ok(())
    }
}