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use crate::util::{Source, SourceError};
use std::fs;
use std::path::{Path, PathBuf};

pub const CATALOG_FILE_NAME: &str = "catalog.yml";

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct Catalog {
    entries: Vec<CatalogEntry>,
}

impl Catalog {
    pub fn new() -> Catalog {
        Catalog { entries: vec![] }
    }

    pub fn load(source: Source) -> Result<Catalog, CatalogError> {
        let catalog_path = match source {
            Source::LocalFile { path } => path,
            Source::RemoteHttp { url: _, path } => path,
            Source::RemoteGit { url: _, path } => path.join(CATALOG_FILE_NAME),
            Source::LocalDirectory { path } => path.join(CATALOG_FILE_NAME),
        };

        if !catalog_path.exists() {
            return Err(CatalogError::NotFound(catalog_path));
        }

        let catalog = fs::read_to_string(&catalog_path)?;
        let catalog = serde_yaml::from_str(&catalog)?;
        Ok(catalog)
    }

    pub fn save_to_file<P: AsRef<Path>>(&self, path: P) -> Result<(), CatalogError> {
        let yaml = serde_yaml::to_string(&self)?;
        fs::write(path, &yaml)?;
        Ok(())
    }

    pub fn entries(&self) -> &[CatalogEntry] {
        self.entries.as_slice()
    }

    pub fn entries_owned(self) -> Vec<CatalogEntry> {
        self.entries
    }
}

#[derive(Debug, Serialize, Deserialize, Clone)]
pub enum CatalogEntry {
    #[serde(rename = "group")]
    Group {
        description: String,
        entries: Vec<CatalogEntry>,
    },
    #[serde(rename = "catalog")]
    Catalog { description: String, source: String },
    #[serde(rename = "archetype")]
    Archetype { description: String, source: String },
}

impl CatalogEntry {
    pub fn description(&self) -> &str {
        match self {
            CatalogEntry::Group {
                description,
                entries: _,
            } => description.as_str(),
            CatalogEntry::Catalog { description, source: _ } => description.as_str(),
            CatalogEntry::Archetype { description, source: _ } => description.as_str(),
        }
    }
}

#[derive(Debug)]
pub enum CatalogError {
    EmptyCatalog,
    EmptyGroup,
    SourceError(SourceError),
    NotFound(PathBuf),
    IOError(std::io::Error),
    YamlError(serde_yaml::Error),
}

impl From<std::io::Error> for CatalogError {
    fn from(e: std::io::Error) -> Self {
        CatalogError::IOError(e)
    }
}

impl From<serde_yaml::Error> for CatalogError {
    fn from(e: serde_yaml::Error) -> Self {
        CatalogError::YamlError(e)
    }
}

impl From<SourceError> for CatalogError {
    fn from(cause: SourceError) -> Self {
        CatalogError::SourceError(cause)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test() {
        let catalog = prototype_catalog();
        let yaml = serde_yaml::to_string(&catalog).unwrap();
        println!("{}", yaml);
    }

    #[test]
    fn test_catalog_group() {
        let group = lang_group();

        let yaml = serde_yaml::to_string(&group).unwrap();
        println!("{}", yaml);
    }

    fn prototype_catalog() -> Catalog {
        Catalog {
            entries: vec![
                lang_group(),
                CatalogEntry::Catalog {
                    description: "Java".to_owned(),
                    source: "~/projects/catalogs/java.yml".to_owned(),
                },
            ],
        }
    }

    fn lang_group() -> CatalogEntry {
        CatalogEntry::Group {
            description: "Languages".to_owned(),
            entries: vec![rust_group(), python_group()],
        }
    }

    fn rust_group() -> CatalogEntry {
        CatalogEntry::Group {
            description: "Rust".to_owned(),
            entries: vec![rust_cli_archetype(), rust_cli_workspace_archetype()],
        }
    }

    fn rust_cli_archetype() -> CatalogEntry {
        CatalogEntry::Archetype {
            description: "Rust CLI".to_owned(),
            source: "~/projects/archetypes/rust-cie".to_owned(),
        }
    }

    fn rust_cli_workspace_archetype() -> CatalogEntry {
        CatalogEntry::Archetype {
            description: "Rust CLI Workspace".to_owned(),
            source: "~/projects/archetypes/rust-cie".to_owned(),
        }
    }

    fn python_group() -> CatalogEntry {
        CatalogEntry::Group {
            description: "Python".to_owned(),
            entries: vec![CatalogEntry::Archetype {
                description: "Python Service".to_owned(),
                source: "~/projects/python/python-service".to_owned(),
            }],
        }
    }
}