use serde::{Deserialize, Serialize};
use std::{
    error::Error,
    fs::{read_to_string, write},
};

// General configuration Struct
#[derive(Debug, Deserialize, Serialize)]
pub struct Config {
    pub peertube: PeertubeConfig,
    pub youtube: YoutubeConfig,
    #[serde(default)]
    pub tootube: TootubeConfig,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct PeertubeConfig {
    pub base_url: String,
    #[serde(default)]
    pub delete_video_source_after_transfer: bool,
    pub oauth2: Option<PeertubeConfigOauth2>,
}

impl Default for PeertubeConfig {
    fn default() -> Self {
        PeertubeConfig {
            base_url: "".to_string(),
            delete_video_source_after_transfer: false,
            oauth2: None,
        }
    }
}

#[derive(Debug, Clone, Deserialize, Serialize)]
pub struct PeertubeConfigOauth2 {
    pub client_id: String,
    pub client_secret: String,
    pub refresh_token: String,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct YoutubeConfig {
    #[serde(default)]
    pub notify_subscribers_on_shorts: bool,
    pub oauth2: YoutubeConfigOauth2,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct YoutubeConfigOauth2 {
    pub refresh_token: String,
    pub client_id: String,
    pub client_secret: String,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct TootubeConfig {
    pub progress_bar: String,
    pub progress_chars: String,
}

impl Default for TootubeConfig {
    fn default() -> Self {
        TootubeConfig {
            progress_bar: "{msg}\n{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {bytes}/{total_bytes} ({bytes_per_sec}, {eta})".to_string(),
            progress_chars: "#>-".to_string(),
        }
    }
}

impl Config {
    /// Parses the TOML file into a Config struct
    pub fn new(toml_file: &str) -> Self {
        let toml_config = read_to_string(toml_file)
            .unwrap_or_else(|e| panic!("Cannot open file {toml_file}: {e}"));

        let config: Config = toml::from_str(&toml_config)
            .unwrap_or_else(|e| panic!("Cannot parse TOML file {toml_file}: {e}"));

        config
    }

    pub fn dump(&mut self, toml_file: &str) -> Result<(), Box<dyn Error>> {
        // bring back the default for progress bar
        self.tootube = TootubeConfig::default();
        write(toml_file, toml::to_string_pretty(self)?)?;
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::fs::{remove_file, write};

    #[test]
    fn test_minimal_conf() {
        let file_name = "/tmp/test_minimal_conf.toml";
        let data = r#"
[peertube]
base_url = 'https://p.nintendojo.fr'

[youtube.oauth2]
refresh_token = 'rt_N/A'
client_id = 'ci_N/A'
client_secret = 'cs_N/A'
"#;
        write(file_name, data).unwrap();
        let config = Config::new(file_name);

        assert_eq!(config.youtube.notify_subscribers_on_shorts, false);
        assert_eq!(config.tootube.progress_chars, "#>-");
        assert_eq!(config.youtube.oauth2.refresh_token, "rt_N/A");
        assert_eq!(config.youtube.oauth2.client_id, "ci_N/A");
        assert_eq!(config.youtube.oauth2.client_secret, "cs_N/A");

        remove_file(file_name).unwrap();
    }
}