use feed_rs::parser;
use thiserror::Error;
use url::Url;

#[derive(Debug, Error)]
pub enum Error {
    #[error("error pulling feed `{0}`: {1}")]
    Pull(Url, PullError),

    #[error("error parsing entry: {0}")]
    Entry(#[from] EntryError),

    #[error("error adding feed: {0}")]
    Add(#[from] AddError),
}

#[derive(Debug, Error)]
pub enum PullError {
    #[error("failed to make request")]
    Request(#[from] reqwest::Error),

    #[error("invalid rss feed: {0}")]
    Parse(#[from] parser::ParseFeedError),

    #[error("failed to pull feed title")]
    TitleUpdate,

    #[error("failed to pull feed link")]
    LinkUpdate,
}

#[derive(Debug, Error)]
pub enum EntryError {
    #[error("missing title")]
    MissingTitle,

    #[error("missing link")]
    MissingLink,

    #[error("invalid link")]
    InvalidLink,

    #[error("missing publish-date")]
    MissingPubDate,
}

#[derive(Debug, Error)]
pub enum AddError {
    #[error("invalid url: {0}")]
    InvalidUrl(String),

    #[error("feed is already present")]
    DuplicateLink,
}

#[derive(Debug, Error)]
pub enum IOError {
    #[error("unable to create or find store path")]
    MissingStorePath,

    #[error("file error:")]
    FileIO(#[from] std::io::Error),

    #[error("yaml ser/de error")]
    Serde(#[from] serde_yaml::Error),
}