//! Configuration, from the environment only. Secrets never have a default.

use std::path::PathBuf;

#[derive(Clone, Debug)]
pub struct Connect {
    /// Base URL of the sso-connect instance (no trailing slash).
    pub base_url: String,
    pub client_id: String,
    pub client_secret: String,
}

#[derive(Clone, Debug)]
pub struct Publish {
    /// Remote of the texts repository, e.g. `gitea@git.open.us.org:yvv/decision-depot-textes-reference.git`.
    pub remote: String,
    pub branch: String,
    /// Private SSH key allowed to push there (deploy key).
    pub key: PathBuf,
    pub author_name: String,
    pub author_email: String,
}

#[derive(Clone, Debug)]
pub struct Config {
    pub bind: String,
    pub data_dir: PathBuf,
    pub web_dir: PathBuf,
    pub seed_dir: PathBuf,
    /// Public origin, e.g. `https://decision.librodrome.org` — callbacks and cookies.
    pub public_url: String,
    pub connect: Option<Connect>,
    pub admin_g1_ids: Vec<String>,
    pub dev_login: bool,
    pub bootstrap_admin: bool,
    pub publish: Option<Publish>,
    pub rpc_endpoints: Vec<String>,
    pub indexers: Vec<String>,
    pub wot_fallback: u32,
    pub build: String,
}

fn var(name: &str) -> Option<String> {
    std::env::var(name).ok().map(|v| v.trim().to_owned()).filter(|v| !v.is_empty())
}

fn flag(name: &str) -> bool {
    var(name).is_some_and(|v| matches!(v.as_str(), "1" | "true" | "yes" | "on"))
}

fn list(name: &str, default: &[&str]) -> Vec<String> {
    match var(name) {
        Some(v) => v.split(',').map(|s| s.trim().to_owned()).filter(|s| !s.is_empty()).collect(),
        None => default.iter().map(|s| (*s).to_owned()).collect(),
    }
}

impl Config {
    pub fn from_env() -> Self {
        let data_dir = PathBuf::from(var("LD_DATA_DIR").unwrap_or_else(|| "data".into()));
        let connect = match (var("LD_CONNECT_CLIENT_ID"), var("LD_CONNECT_CLIENT_SECRET")) {
            (Some(client_id), Some(client_secret)) => Some(Connect {
                base_url: var("LD_CONNECT_URL")
                    .unwrap_or_else(|| "https://connect.monnaie-libre.fr".into())
                    .trim_end_matches('/')
                    .to_owned(),
                client_id,
                client_secret,
            }),
            _ => None,
        };
        let publish = var("LD_PUBLISH_REMOTE").map(|remote| Publish {
            remote,
            branch: var("LD_PUBLISH_BRANCH").unwrap_or_else(|| "main".into()),
            key: var("LD_PUBLISH_KEY").map(PathBuf::from).unwrap_or_else(|| data_dir.join("keys/publish_ed25519")),
            author_name: var("LD_PUBLISH_AUTHOR").unwrap_or_else(|| "libreDecision".into()),
            author_email: var("LD_PUBLISH_EMAIL").unwrap_or_else(|| "decision@librodrome.org".into()),
        });
        Self {
            bind: var("LD_BIND").unwrap_or_else(|| "0.0.0.0:8002".into()),
            web_dir: PathBuf::from(var("LD_WEB_DIR").unwrap_or_else(|| "web/build".into())),
            seed_dir: PathBuf::from(var("LD_SEED_DIR").unwrap_or_else(|| "seeds".into())),
            public_url: var("LD_PUBLIC_URL")
                .unwrap_or_else(|| "http://127.0.0.1:3002".into())
                .trim_end_matches('/')
                .to_owned(),
            connect,
            admin_g1_ids: list("LD_ADMIN_G1_IDS", &[]),
            dev_login: flag("LD_DEV_LOGIN"),
            bootstrap_admin: flag("LD_BOOTSTRAP_ADMIN"),
            publish,
            rpc_endpoints: list(
                "LD_RPC_ENDPOINTS",
                &[
                    "https://rpc.duniter.org",
                    "https://g1.axiom-team.fr/ws/",
                    "https://g1.asycn.io/ws/",
                    "https://g1.coinduf.eu",
                ],
            ),
            indexers: list(
                "LD_INDEXERS",
                &["https://indexer.duniter.org/v1/graphql", "https://g1-squid.axiom-team.fr/v1/graphql"],
            ),
            wot_fallback: var("LD_WOT_FALLBACK").and_then(|v| v.parse().ok()).unwrap_or(5745),
            build: var("LD_BUILD").unwrap_or_else(|| "dev".into()),
            data_dir,
        }
    }

    /// Cookies are `Secure` as soon as the public origin is https.
    pub fn secure_cookies(&self) -> bool {
        self.public_url.starts_with("https://")
    }

    pub fn connect_callback(&self) -> String {
        format!("{}/api/auth/g1/callback", self.public_url)
    }

    /// For tests: an in-memory configuration with dev login.
    pub fn for_tests() -> Self {
        Self {
            bind: "127.0.0.1:0".into(),
            data_dir: std::env::temp_dir().join("ld-tests"),
            web_dir: PathBuf::from("web/build"),
            seed_dir: PathBuf::from(concat!(env!("CARGO_MANIFEST_DIR"), "/../../seeds")),
            public_url: "http://127.0.0.1:3002".into(),
            connect: None,
            admin_g1_ids: vec!["idty:8352".into()],
            dev_login: true,
            bootstrap_admin: false,
            publish: None,
            rpc_endpoints: vec![],
            indexers: vec![],
            wot_fallback: 5745,
            build: "test".into(),
        }
    }
}