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#![deny(missing_docs)]
#![deny(clippy::all)]
#![deny(unsafe_code)]
#![allow(clippy::upper_case_acronyms)]
//! Please, see the [`rust-releases`] for additional documentation on how this crate can be used.
//!
//! [`rust-releases`]: https://docs.rs/rust-releases

#[cfg(test)]
#[macro_use]
extern crate rust_releases_io;

use regex::{Captures, Regex};
use rust_releases_core::{semver, Channel, FetchResources, Release, ReleaseIndex, Source};
use rust_releases_io::Document;
use std::collections::BTreeSet;
use std::iter::FromIterator;

pub(crate) mod errors;
pub(crate) mod fetch;

pub use crate::errors::{RustDistError, RustDistResult};

/// A [`Source`] which obtains its input data from the Rust distribution bucket on AWS S3.
///
/// [`Source`]: rust_releases_core::Source
pub struct RustDist {
    source: Document,
}

impl RustDist {
    #[cfg(test)]
    pub(crate) fn from_document(source: Document) -> Self {
        Self { source }
    }
}

lazy_static::lazy_static! {
    static ref MATCHER: Regex =
        Regex::new(r"(?m)^dist/rustc-(?P<major>\d+).(?P<minor>\d+).(?P<patch>\d+)(?:\-(alpha|beta|nightly)(\.\d+))?").unwrap();
}

impl Source for RustDist {
    type Error = RustDistError;

    fn build_index(&self) -> Result<ReleaseIndex, Self::Error> {
        let buffer = self.source.buffer();
        let content = std::str::from_utf8(buffer).map_err(RustDistError::UnrecognizedText)?;

        let releases = MATCHER
            .captures_iter(content)
            .map(parse_release)
            .collect::<RustDistResult<BTreeSet<Release>>>()?;

        Ok(ReleaseIndex::from_iter(releases))
    }
}

fn parse_release(capture: Captures) -> RustDistResult<Release> {
    const MAJOR: &str = "major";
    const MINOR: &str = "minor";
    const PATCH: &str = "patch";

    let major = capture[MAJOR].parse::<u64>().map_err(|_| {
        RustDistError::UnableToParseVersionNumberComponent(&MAJOR, capture[MAJOR].to_string())
    })?;
    let minor = capture[MINOR].parse::<u64>().map_err(|_| {
        RustDistError::UnableToParseVersionNumberComponent(&MINOR, capture[MINOR].to_string())
    })?;
    let patch = capture[PATCH].parse::<u64>().map_err(|_| {
        RustDistError::UnableToParseVersionNumberComponent(&PATCH, capture[PATCH].to_string())
    })?;

    Ok(Release::new_stable(semver::Version::new(
        major, minor, patch,
    )))
}

impl FetchResources for RustDist {
    type Error = RustDistError;

    fn fetch_channel(channel: Channel) -> Result<Self, Self::Error> {
        if let Channel::Stable = channel {
            let source = fetch::fetch()?;
            Ok(Self { source })
        } else {
            Err(RustDistError::ChannelNotAvailable(channel))
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::RustDist;
    use rust_releases_core::{semver, Release, ReleaseIndex};
    use rust_releases_io::Document;
    use std::fs;

    #[test]
    fn source_rust_dist() {
        let path = [
            env!("CARGO_MANIFEST_DIR"),
            "/../../resources/rust_dist/dist_static-rust-lang-org.txt",
        ]
        .join("");

        let buffer = fs::read(path).unwrap();
        let document = Document::new(buffer);

        let strategy = RustDist::from_document(document);
        let index = ReleaseIndex::from_source(strategy).unwrap();

        // 74 releases including minor releases from 1.0.0 to 1.53.0
        let releases = index.releases();

        assert_eq!(releases.len(), 74);
        assert_eq!(
            releases[0],
            Release::new_stable(semver::Version::new(1, 53, 0))
        );
        assert_eq!(
            releases[releases.len() - 1],
            Release::new_stable(semver::Version::new(1, 0, 0))
        );
    }
}