use figment::{providers::Serialized, value, Figment, Metadata, Profile, Provider};
use serde::{Deserialize, Serialize};

#[derive(Debug, PartialEq, Eq, Clone, Serialize, Deserialize)]
pub struct Config {
    pub program: String,
    pub args: Vec<String>,
}

impl Config {
    pub fn from<T: Provider>(provider: T) -> figment::error::Result<Config> {
        Figment::from(provider).extract()
    }
}

impl Default for Config {
    fn default() -> Self {
        Self {
            program: "fzf-tmux".into(),
            args: vec![
                "--",
                "--multi",
                "--print-query",
                "-d/",
                "--preview-window='right,75%,<80(up,75%,border-bottom)'",
                "--preview='sel={}; less ${sel:-{q}} 2>/dev/null'",
            ]
            .into_iter()
            .map(Into::into)
            .collect(),
        }
    }
}

impl Provider for Config {
    fn metadata(&self) -> Metadata {
        Metadata::named("Tmuxr finder config")
    }

    fn data(&self) -> figment::error::Result<value::Map<Profile, value::Dict>> {
        Serialized::defaults(Config::default()).data()
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use figment::providers::{Format, Serialized, Toml};

    #[test]
    fn defaults() {
        figment::Jail::expect_with(|jail| {
            jail.create_file(
                "tmuxr.toml",
                r#"
                program = "fzf-tmux"
                args = [
                    "--",
                    "--multi",
                    "--print-query",
                    "-d/",
                    "--preview-window='right,75%,<80(up,75%,border-bottom)'",
                    "--preview='sel={}; less ${sel:-{q}} 2>/dev/null'",
                ]
                "#,
            )?;

            let config: Config = Figment::from(Serialized::defaults(Config::default()))
                .merge(Toml::file("tmuxr.toml"))
                .extract()?;

            assert_eq!(config, Config::default());

            Ok(())
        });
    }

    #[test]
    fn custom() {
        figment::Jail::expect_with(|jail| {
            jail.create_file(
                "tmuxr.toml",
                r#"
                program = "fzf"
                args = ["-0", "-1", "--preview='cat'"]
                "#,
            )?;

            let config: Config = Figment::from(Serialized::defaults(Config::default()))
                .merge(Toml::file("tmuxr.toml"))
                .extract()?;

            assert_eq!(
                config,
                Config {
                    program: "fzf".into(),
                    args: vec!["-0".into(), "-1".into(), "--preview='cat'".into()],
                }
            );

            Ok(())
        });
    }
}