fs_metadata 0.4.5

use chrono::{DateTime, Local};
use std::fs::{self, Metadata};
use std::path::Path;
use faccess::PathExt;

pub struct FileMetadata {
    pub created: String,
    pub modified: String,
    pub accessed: String,
    pub is_file_read_only: bool,
    pub is_dir: bool,
    pub is_file: bool,
    pub is_readable: bool,
    pub is_writable: bool,
    pub is_executable: bool,
    data: Metadata,
}

/// Implementation of methods for the `FileMetadata` struct, providing functionality
/// to create a new instance from a file path, retrieve file metadata, and access
/// human-readable file size information.
///
/// # Methods
///
/// - `new(path: &Path) -> Result<Self, String>`
///   Constructs a new `FileMetadata` instance from the given file path, extracting
///   metadata such as creation, modification, and access times, as well as file
///   permissions and type. Returns an error if metadata cannot be read.
///
/// - `get_human_readable_file_size(&self) -> (f32, f32, f32, f32)`
///   Returns the file size in kilobytes, megabytes, gigabytes, and terabytes as a tuple.
///
/// - `readable(&self) -> bool`
///   Returns `true` if the file is readable, otherwise `false`.
///
/// - `writable(&self) -> bool`
///   Returns `true` if the file is writable, otherwise `false`.
///
/// - `executable(&self) -> bool`
///   Returns `true` if the file is executable, otherwise `false`.
///
/// - `get_file_in_kilobytes(&self) -> f32`
///   Returns the file size in kilobytes.
///
/// - `get_file_in_megabytes(&self) -> f32`
///   Returns the file size in megabytes.
///
/// - `get_file_in_gigabytes(&self) -> f32`
///   Returns the file size in gigabytes.
///
/// - `get_file_in_terabytes(&self) -> f32`
///   Returns the file size in terabytes.
impl FileMetadata {

    pub fn new(path: &Path) -> Result<Self, String> {
        let metadata = fs::metadata(path);

        match metadata {
            Ok(data) => {
                let created_system_time: DateTime<Local> = data
                    .created()
                    .expect("Could not read accessed system time")
                    .into();
                let modified_system_time: DateTime<Local> = data
                    .modified()
                    .expect("Could not read modified system time")
                    .into();
                let accessed_system_time: DateTime<Local> = data
                    .accessed()
                    .expect("Could not read accessed system time")
                    .into();

                Ok(FileMetadata {
                    accessed: accessed_system_time.format("%Y-%m-%d").to_string(),
                    modified: modified_system_time.format("%Y-%m-%d").to_string(),
                    created: created_system_time.format("%Y-%m-%d").to_string(),
                    is_file_read_only: data.permissions().readonly(),
                    is_dir: data.is_dir(),
                    is_file: data.is_file(),
                    is_readable: path.readable(),
                    is_writable: path.writable(),
                    is_executable: path.executable(),
                    data,
                })
            }
            Err(_) => Err("Failed to read metadata from file".to_string()),
        }
    }

    fn get_human_readable_file_size(&self) -> (f32, f32, f32, f32) {
        let bytes = self.data.len() as f32;
        let kilobytes = bytes / 1024.0;
        let megabytes = bytes / 1_048_576.0;
        let gigabytes = bytes / 1_073_741_824.0;
        let terabytes = bytes / 1_099_511_627_776.0;

        (kilobytes, megabytes, gigabytes, terabytes)
    }

    pub fn readable(&self) -> bool {
        self.is_readable
    }

    pub fn writable(&self) -> bool {
        self.is_writable
    }

    pub fn executable(&self) -> bool {
        self.is_executable
    }

    pub fn get_file_in_kilobytes(&self) -> f32 {
        let (k, _m, _g, _t) = self.get_human_readable_file_size();
        k
    }

    pub fn get_file_in_megabytes(&self) -> f32 {
        let (_k, m, _g, _t) = self.get_human_readable_file_size();
        m
    }

    pub fn get_file_in_gigabytes(&self) -> f32 {
        let (_k, _m, g, _t) = self.get_human_readable_file_size();
        g
    }

    pub fn get_file_in_terabytes(&self) -> f32 {
        let (_k, _m, _g, t) = self.get_human_readable_file_size();
        t
    }
}

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

    fn is_valid_date(s: &str) -> bool {
        chrono::NaiveDate::parse_from_str(s, "%Y-%m-%d").is_ok()
    }

    #[test]
    fn can_make_file_metadata() {
        let result = FileMetadata::new(Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg")).unwrap();

        assert!(is_valid_date(&result.created), "created date '{}' is not YYYY-MM-DD", result.created);
        assert!(is_valid_date(&result.modified), "modified date '{}' is not YYYY-MM-DD", result.modified);
        assert!(is_valid_date(&result.accessed), "accessed date '{}' is not YYYY-MM-DD", result.accessed);
    }

    #[test]
    fn has_permissions() {
        let path: &Path = Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg");
        let result = FileMetadata::new(path).unwrap();

        assert_eq!(result.is_readable, true);
        assert_eq!(result.is_writable, true);
        assert_eq!(result.is_executable, false);
    }

    #[test]
    fn is_file_read_only() {
        let path: &Path = Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg");
        let result = FileMetadata::new(path).unwrap();
        assert_eq!(result.is_file_read_only, false)
    }

    #[test]
    fn is_dir() {
        let path: &Path = Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg");
        let result = FileMetadata::new(path).unwrap();
        assert_eq!(result.is_dir, false);
    }

    #[test]
    fn is_file() {
        let path: &Path = Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg");
        let result = FileMetadata::new(path).unwrap();
        assert_eq!(result.is_file, true);
    }

    #[test]
    fn can_get_file_size() {
        let path: &Path = Path::new("../test-media/400a861d-014a-4dfb-9143-1a914212fd4d.jpg");
        let result = FileMetadata::new(path).unwrap();
        assert_eq!(true, result.get_file_in_kilobytes() > 0.0);
        assert_eq!(true, result.get_file_in_megabytes() > 0.0);
        assert_eq!(true, result.get_file_in_gigabytes() > 0.0);
        assert_eq!(true, result.get_file_in_terabytes() > 0.0);
    }
}