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use std::path::PathBuf;

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct FileFilter {
    packages: Vec<String>,
    suffixes: Vec<String>,
}

impl Default for FileFilter {
    fn default() -> Self {
        FileFilter {
            packages: vec![],
            suffixes: vec![]
        }
    }
}

impl FileFilter {
    pub fn new(packages: Vec<String>, suffixes: Vec<String>) -> FileFilter {
        FileFilter {
            packages,
            suffixes
        }
    }

    pub fn allow(&self, path: PathBuf) -> bool {
        if self.packages.len() == 0 && self.suffixes.len() == 0 {
            return true;
        }

        if self.packages.len() > 0 {
            return filter_by_packages(path, &self.packages)
        }

        if self.suffixes.len() > 0 {
            return filter_by_suffix(path, &self.suffixes)
        }

        return false;
    }
}

pub fn no_filter(_path: PathBuf, _packages: Vec<String>) -> bool {
    return true;
}

pub fn filter_by_packages(path: PathBuf, packages: &Vec<String>) -> bool {
    if packages.len() == 0 {
        return true;
    }

    let mut include_package = false;
    for child in path.iter() {
        if let Some(sub) = child.to_str() {
            if packages.contains(&sub.to_string()) {
                include_package = true;
            }
        }
    }

    return include_package;
}

pub fn filter_by_suffix(path: PathBuf, suffixes: &Vec<String>) -> bool {
    if suffixes.len() == 0 {
        return true;
    }

    if let None = path.file_name() {
        return false;
    }

    let file_name = path.file_name().unwrap().to_str().unwrap();

    for suffix in suffixes.iter() {
        if file_name.contains(suffix) {
            return true;
        }
    }

    return false;
}


#[cfg(test)]
mod tests {
    use std::path::PathBuf;
    use crate::file_filter::{filter_by_suffix, filter_by_packages};

    #[test]
    fn should_filter_by_file_name_suffix() {
        let buf = PathBuf::new().join("model").join("CustomModel.java");
        let suffixes = vec!["Model".to_string()];

        assert!(filter_by_suffix(buf, &suffixes));
    }

    #[test]
    fn should_return_false_when_not_correct_name() {
        let buf = PathBuf::new().join("controller").join("CustomController.java");
        let suffixes = vec!["Model".to_string()];

        assert_eq!(false, filter_by_suffix(buf, &suffixes));
    }

    #[test]
    fn should_no_filter_for_empty_suffix() {
        let buf = PathBuf::new().join("controller").join("CustomController.java");
        let suffixes: Vec<String> = vec![];

        assert_eq!(true, filter_by_suffix(buf, &suffixes));
    }

    #[test]
    fn should_filter_by_package() {
        let buf = PathBuf::new()
            .join("model")
            .join("CustomModel.java");

        let suffixes = vec!["model".to_string()];

        assert!(filter_by_packages(buf, &suffixes));
    }

    #[test]
    fn should_return_no_when_no_in_dir() {
        let buf = PathBuf::new()
            .join("model")
            .join("CustomModel.java");

        let suffixes = vec!["controller".to_string()];

        assert_eq!(false, filter_by_packages(buf, &suffixes));
    }

    #[test]
    fn should_no_filter_for_empty_package() {
        let buf = PathBuf::new()
            .join("model")
            .join("CustomModel.java");

        let suffixes: Vec<String> = vec![];

        assert!(filter_by_packages(buf, &suffixes));
    }
}