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use super::{err, Dictionary};
// #[cfg(feature = "embed")]
use rust_embed::EmbeddedFile;
use std::path::PathBuf;

/// Helper for setting `default_locale` configuration
pub struct DefaultLocale<T>(pub T);

pub trait ConfigPart {
    fn add_to(self, config: Config) -> Config;
}

impl<T> ConfigPart for DefaultLocale<T>
where
    T: Into<String>,
{
    fn add_to(self, config: Config) -> Config {
        config.with_default_locale(self.0)
    }
}

impl<T> ConfigPart for (T,)
where
    T: ConfigPart,
{
    fn add_to(self, config: Config) -> Config {
        self.0.add_to(config)
    }
}

impl<'a, T, U> ConfigPart for (T, U)
where
    T: ConfigPart,
    U: ConfigPart,
{
    fn add_to(self, opts: Config) -> Config {
        self.1.add_to(self.0.add_to(opts))
    }
}

impl<'a, T, U, V> ConfigPart for (T, U, V)
where
    T: ConfigPart,
    U: ConfigPart,
    U: ConfigPart,
    V: ConfigPart,
{
    fn add_to(self, opts: Config) -> Config {
        self.2.add_to(self.1.add_to(self.0.add_to(opts)))
    }
}

impl<'a, T, U, V, W> ConfigPart for (T, U, V, W)
where
    T: ConfigPart,
    U: ConfigPart,
    U: ConfigPart,
    V: ConfigPart,
    W: ConfigPart,
{
    fn add_to(self, opts: Config) -> Config {
        self.3
            .add_to(self.2.add_to(self.1.add_to(self.0.add_to(opts))))
    }
}

impl<T> From<T> for Config
where
    T: ConfigPart,
{
    fn from(t: T) -> Self {
        t.add_to(Self::default())
    }
}

pub struct EmbeddedMeta {
    pub file: EmbeddedFile,
    pub name: String,
}

impl Clone for EmbeddedMeta {
    fn clone(&self) -> Self {
        Self {
            file: EmbeddedFile {
                data: self.file.data.clone(),
                metadata: rust_embed::Metadata::__rust_embed_new(
                    self.file.metadata.sha256_hash(),
                    self.file.metadata.last_modified(),
                ),
            },
            name: self.name.clone(),
        }
    }
}

/// Configuration to build a `Dictionary`
#[derive(Clone)]
pub struct Config {
    embed_assets: Vec<EmbeddedMeta>,
    default_locale: Option<String>,
}

impl Default for Config {
    fn default() -> Self {
        Self::global()
    }
}

impl Config {
    pub(crate) fn global() -> Self {
        Self {
            default_locale: None,
            embed_assets: Vec::new(),
        }
    }

    /// Set the default locale.
    pub fn with_default_locale<I: Into<String>>(mut self, default_locale: I) -> Self {
        self.default_locale = Some(default_locale.into());
        self
    }

    pub fn with_embed<T: rust_embed::RustEmbed>(mut self) -> Self {
        T::iter().for_each(|filename| {
            self.embed_assets.push(EmbeddedMeta {
                file: T::get(filename.as_ref()).unwrap(),
                name: filename.to_string(),
            });
        });
        self
    }

    /// Build the `Dictionary` item.
    pub fn finish(self) -> err::Result<Dictionary> {
        let mut out = Dictionary::default();

        for asset in self.embed_assets {
            let path = PathBuf::from(asset.name);

            let locale = match path.file_stem().and_then(|x| x.to_str()) {
                Some(locale) => locale.to_string(),
                None => continue,
            };

            let value = match path.extension().and_then(|x| x.to_str()) {
                Some("json") => {
                    serde_json::from_reader::<_, serde_json::Value>(asset.file.data.as_ref())?
                }
                #[cfg(feature = "yaml")]
                Some("yml") => {
                    serde_yaml::from_reader::<_, serde_json::Value>(asset.file.data.as_ref())?
                }
                #[cfg(feature = "toml")]
                Some("toml") => toml::from_slice::<serde_json::Value>(asset.file.data.as_ref())?,
                _ => {
                    continue;
                }
            };

            out.inner.insert(locale, value);
        }

        if let Some(locale) = self.default_locale {
            out.default_locale = locale;
        }

        Ok(out)
    }
}