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extern crate libc;

use crate::colors::*;
use chrono::{DateTime, Local};
use libc::{S_IRGRP, S_IROTH, S_IRUSR, S_IWGRP, S_IWOTH, S_IWUSR, S_IXGRP, S_IXOTH, S_IXUSR};
use std::os::unix::fs::PermissionsExt;
use std::{error::Error, ffi::OsString, path::Path};

#[derive(Clone)]
pub struct Entry {
    mode: (bool, u32),
    size: f64,
    modified: DateTime<Local>,
    file_name: OsString,
    pub print: String,
}

impl Entry {
    pub fn new(
        mode: (bool, u32),
        size: f64,
        modified: DateTime<Local>,
        file_name: OsString,
    ) -> Self {
        let mut entry = Entry {
            mode,
            size,
            modified,
            file_name,
            print: String::new(),
        };
        entry.generate_print();

        entry
    }

    pub fn from_path(path: &Path) -> Result<Self, Box<dyn Error>> {
        let metadata = path.metadata()?;
        let mode = (metadata.is_dir(), metadata.permissions().mode());
        let size = metadata.len() as f64;
        let modified: DateTime<Local> = DateTime::from(metadata.modified()?);
        let file_name = path.as_os_str().to_os_string();

        let entry = Entry::new(mode, size, modified, file_name);

        Ok(entry)
    }

    fn generate_print(&mut self) {
        let order = if self.size % 1000000000000.0 != self.size {
            self.size /= 1000000000000.0;
            "TB"
        } else if self.size % 1000000000.0 != self.size {
            self.size /= 1000000000.0;
            "GB"
        } else if self.size % 1000000.0 != self.size {
            self.size /= 1000000.0;
            "MB"
        } else if self.size % 1000.0 != self.size {
            self.size /= 1000.0;
            "KB"
        } else {
            "B"
        };

        self.print = format!(
            "{} {} {} {}",
            self.clone().parse_permissions(),
            format_args!("{}{:>5} {}{:<2}{}", MAGENTA, self.size, BOLD, order, RESET),
            format_args!(
                "{}{}{}",
                CYAN,
                self.modified.format("%_d %b %H %H:%M"),
                RESET
            ),
            format_args!("{}{:?}{}", BLUE, self.file_name, RESET)
        );
    }

    fn parse_permissions(self) -> String {
        let mut formated_mode = String::new();

        let directory: String = if self.mode.0 {
            format!("{}{}d{}", BLUE, BOLD, RESET)
        } else {
            format!("{}·{}", BLACK, RESET)
        };

        formated_mode.push_str(directory.as_str());

        let user = self.triplet(S_IRUSR, S_IWUSR, S_IXUSR);
        formated_mode.push_str(user.as_str());

        let group = self.triplet(S_IRGRP, S_IWGRP, S_IXGRP);
        formated_mode.push_str(group.as_str());

        let other = self.triplet(S_IROTH, S_IWOTH, S_IXOTH);
        formated_mode.push_str(other.as_str());

        formated_mode
    }

    fn triplet(&self, read: u32, write: u32, execute: u32) -> String {
        match (
            self.mode.1 & read,
            self.mode.1 & write,
            self.mode.1 & execute,
        ) {
            (0, 0, 0) => format!("{}---{}", BLACK, RESET),
            (_, 0, 0) => format!("{}{}r{}{}--{}", BOLD, GREEN, RESET, BLACK, RESET),
            (0, _, 0) => format!("{}-{}{}w{}{}-{}", BLACK, BOLD, YELLOW, RESET, BLACK, RESET),
            (0, 0, _) => format!("{}--{}{}x{}", BLACK, BOLD, RED, RESET),
            (_, 0, _) => format!(
                "{}{}r{}{}-{}{}x{}",
                BOLD, GREEN, RESET, BLACK, BOLD, RED, RESET
            ),
            (_, _, 0) => format!("{}{}r{}w{}{}-{}", BOLD, GREEN, YELLOW, RESET, BLACK, RESET),
            (0, _, _) => format!("{}-{}{}w{}x{}", BLACK, BOLD, YELLOW, GREEN, RESET),
            (_, _, _) => format!("{}{}r{}w{}x{}", BOLD, GREEN, YELLOW, GREEN, RESET),
        }
    }
}