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use std::path::PathBuf;

#[derive(Clone, Debug)]
pub struct PathResolver {
    paths: Vec<PathBuf>,
}

impl PathResolver {
    pub fn new<T>(path: T) -> Self
    where
        T: Into<PathBuf>,
    {
        Self {
            paths: vec![path.into()],
        }
    }

    pub fn add(&mut self, path: PathBuf) {
        self.paths.push(path);
    }

    pub fn build(&self) -> PathBuf {
        let mut iter = self.paths.iter();

        let mut last_file_name;
        let mut ret = iter.next().unwrap().clone();
        last_file_name = ret.file_name().unwrap().to_os_string();
        ret = ret.clone();
        ret.pop();

        for path in iter {
            let mut path = path.clone();
            last_file_name = path.file_name().unwrap().to_os_string();
            path.pop();
            ret.push(path);
        }

        ret.push(last_file_name);
        ret
    }
}

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

    #[test]
    fn test_path_resolver() -> anyhow::Result<()> {
        let path_base = PathResolver::new("./base_dir/base_file.puml");
        let mut path1 = path_base.clone();
        path1.add("./dir1-1/file1-1.puml".into());
        println!("path1 = {path1:?}, {:?}", path1.build());
        assert_eq!(
            path1.build(),
            PathBuf::from("./base_dir/dir1-1/file1-1.puml")
        );

        let mut path2 = path1.clone();
        path1.add("./dir2-1/file2-1.puml".into());
        println!("path1 = {path1:?}, {:?}", path1.build());
        assert_eq!(
            path1.build(),
            PathBuf::from("./base_dir/dir1-1/dir2-1/file2-1.puml")
        );
        path2.add("./dir1-1/file1-1.puml".into());
        println!("path2 = {path2:?}, {:?}", path2.build());
        assert_eq!(
            path2.build(),
            PathBuf::from("./base_dir/dir1-1/dir1-1/file1-1.puml")
        );

        let mut path1 = path_base.clone();
        path1.add("./dir1-2/file1-2.puml".into());
        println!("path1 = {path1:?}, {:?}", path1.build());
        assert_eq!(
            path1.build(),
            PathBuf::from("./base_dir/dir1-2/file1-2.puml")
        );

        let mut path2 = path1.clone();
        path1.add("./dir2-2/file2-2.puml".into());
        println!("path1 = {path1:?}, {:?}", path1.build());
        assert_eq!(
            path1.build(),
            PathBuf::from("./base_dir/dir1-2/dir2-2/file2-2.puml")
        );
        path2.add("./dir1-2/file1-2.puml".into());
        println!("path2 = {path2:?}, {:?}", path2.build());
        assert_eq!(
            path2.build(),
            PathBuf::from("./base_dir/dir1-2/dir1-2/file1-2.puml")
        );

        Ok(())
    }
}