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use super::Local;
use pathdiff::diff_paths;
use std::fs;
use std::path::{Path, PathBuf};
use thiserror::Error;

const DEFAULT_VERSION_FILE_NAME: &str = ".php-version";

#[derive(clap::Parser, Debug)]
pub struct File {
    /// Spacify a custom version file name
    #[clap(long = "version-file-name", env = "PHPUP_VERSION_FILE_NAME", default_value = DEFAULT_VERSION_FILE_NAME)]
    filename: PathBuf,

    /// Enable recursive search in a parent dirctory for a version file
    #[clap(
        long = "recursive-version-file",
        visible_alias = "recursive",
        env = "PHPUP_RECURSIVE_VERSION_FILE"
    )]
    is_recursive: bool,
}

#[derive(Error, Debug)]
pub enum Error {
    #[error("Can't parse string written in {filepath}: {source}")]
    FailedParseVersion {
        filepath: PathBuf,
        #[source]
        source: super::semantic::ParseError,
    },
    #[error("Can't find a version file: \"{0}\"")]
    NoVersionFile(PathBuf),
}

pub struct FileInfo {
    pub version: Local,
    pub filepath: PathBuf,
}
impl FileInfo {
    fn to_relative_path(&self, base_dir: impl AsRef<Path>) -> Self {
        Self {
            version: self.version,
            filepath: diff_paths(&self.filepath, base_dir).unwrap(),
        }
    }
}

impl File {
    pub fn is_recursive(&self) -> bool {
        self.is_recursive
    }
    pub fn filename(&self) -> &Path {
        self.filename.as_path()
    }
    pub fn get_version_info(&self) -> Result<FileInfo, Error> {
        let current_dir = std::env::current_dir().expect("Can't get a current directory");
        (if self.is_recursive {
            self.search_recursively(&current_dir)
        } else {
            self.search_current(&current_dir)?
                .ok_or_else(|| Error::NoVersionFile(self.filename.clone()))
        })
        .map(|info| info.to_relative_path(&current_dir))
    }

    fn search_current(&self, current_dir: impl AsRef<Path>) -> Result<Option<FileInfo>, Error> {
        let filepath = current_dir.as_ref().join(self.filename.as_path());
        fs::read_to_string(&filepath)
            .ok()
            .map(|string| {
                string
                    .trim()
                    .parse::<Local>()
                    .map_err(|source| Error::FailedParseVersion {
                        filepath: filepath.clone(),
                        source,
                    })
                    .map(|version| FileInfo { version, filepath })
            })
            .transpose()
    }

    fn search_recursively(&self, current_dir: impl AsRef<Path>) -> Result<FileInfo, Error> {
        let mut searching_dir = Some(current_dir.as_ref());
        while let Some(dir) = searching_dir {
            if let Some(version_info) = self.search_current(dir)? {
                return Ok(version_info);
            }
            searching_dir = dir.parent()
        }
        Err(Error::NoVersionFile(self.filename.clone()))
    }
}

#[cfg(test)]
mod test {
    use super::*;
    use std::{fs, io::Write};

    #[test]
    fn search_current_success() {
        let module = File {
            filename: PathBuf::from(".php-version"),
            is_recursive: false,
        };

        let current_dir = tempfile::tempdir().unwrap();
        let version_file_path = current_dir.path().join(".php-version");
        fs::File::create(&version_file_path)
            .unwrap()
            .write_all(b"8.1.1")
            .unwrap();

        let version_info = module.search_current(current_dir);
        assert!(version_info.is_ok());

        let version_info = version_info.unwrap().unwrap();
        assert_eq!(version_info.version, "8.1.1".parse().unwrap());
        assert_eq!(version_info.filepath, version_file_path);
    }

    #[test]
    fn search_recursively_success() {
        let module = File {
            filename: PathBuf::from(".php-version"),
            is_recursive: true,
        };

        let root_dir = tempfile::tempdir().unwrap();
        let version_file_path = root_dir.path().join(".php-version");
        fs::File::create(&version_file_path)
            .unwrap()
            .write_all(b"8.1.1")
            .unwrap();

        let current_dir = root_dir.path().join("sub-dir").join("sub-sub-dir");
        let version_info = module.search_recursively(current_dir);
        assert!(version_info.is_ok());

        let version_info = version_info.unwrap();
        assert_eq!(version_info.version, "8.1.1".parse().unwrap(),);
        assert_eq!(version_info.filepath, version_file_path);
    }
}