use crate::file_handler::{File, FileHandler};
use std::fs::read_dir;
use std::path::PathBuf;

pub fn find_files(directory_path: &PathBuf) -> Vec<File> {
    return find_files_recursively(directory_path, directory_path);
}

fn find_files_recursively(root_path: &PathBuf, directory_path: &PathBuf) -> Vec<File> {
    let mut result: Vec<File> = vec![];
    let file_handler = FileHandler::default();
    let entries = read_dir(&directory_path).unwrap();
    for entry in entries {
        let path = entry.unwrap().path();
        let relative_path = path.strip_prefix(&root_path).unwrap();
        if relative_path.starts_with(".git") || relative_path.starts_with(".gitignore") {
            continue;
        }
        if path.is_dir() {
            result.append(&mut find_files_recursively(&root_path, &path))
        } else {
            let file_type = file_handler.identify(&path);
            result.push(File {
                path: path,
                file_type: file_type,
            });
        }
    }
    return result;
}


#[cfg(test)]
mod tests {
    use super::*;
    use crate::file_handler::FileType;
    use std::collections::HashSet;
    use std::fs::create_dir_all;

    fn fixtures_dir() -> PathBuf {
        PathBuf::from("tests/fixtures")
    }

    fn get_paths(files: &Vec<File>) -> HashSet<String> {
        files
            .iter()
            .map(|f| f.path.strip_prefix(&fixtures_dir()).unwrap().to_string_lossy().to_string())
            .collect()
    }

    #[test]
    fn finds_all_files() {
        let files = find_files(&fixtures_dir());
        let paths = get_paths(&files);

        assert!(paths.contains("test1.gmi"));
        assert!(paths.contains("_layout.html"));
        assert!(paths.contains("nested/nested.gmi"));
        assert!(paths.contains("assets/style.css"));
        assert!(paths.contains("image.png"));
    }

    #[test]
    fn identifies_correct_file_types() {
        let files = find_files(&fixtures_dir());

        for file in files {
            let extension = file.path.extension().and_then(|e| e.to_str());
            match extension {
                Some("gmi") => assert_eq!(file.file_type, FileType::Gemini),
                Some("html") => {
                    if file.path.ends_with("_layout.html") {
                        assert_eq!(file.file_type, FileType::Layout)
                    } else {
                        assert_eq!(file.file_type, FileType::File)
                    }
                },
                _ => assert_eq!(file.file_type, FileType::File),
            }
        }
    }

    #[test]
    fn ignores_git_directory() {
        let files = find_files(&fixtures_dir());
        let paths = get_paths(&files);

        // These files should exist in the fixtures but not be included
        assert!(!paths.iter().any(|p| p.starts_with(".git/")));
        assert!(!paths.contains(".gitignore"));
    }

    #[test]
    fn handles_nested_directories() {
        let files = find_files(&fixtures_dir());
        let paths = get_paths(&files);

        // Check that files in nested directories are found
        assert!(paths.contains("nested/nested.gmi"));
        assert!(paths.contains("assets/style.css"));

        // Verify directory structure is preserved in paths
        let nested_files: Vec<_> = files.iter()
            .filter(|f| f.path.starts_with(fixtures_dir().join("nested")))
            .collect();
        assert!(!nested_files.is_empty());
    }

    #[test]
    fn returns_empty_for_empty_directory() {
        let empty_dir = fixtures_dir().join("empty");
        let _ = create_dir_all(&empty_dir);
        let files = find_files(&empty_dir);
        assert!(files.is_empty());
    }
}