use anyhow::{Error, Result};
use std::fs;
use std::path::{Path, PathBuf};

pub fn scan_dir(p: &Path, cb: &mut dyn FnMut(PathBuf) -> bool) {
    if p.is_dir() {
        if let Ok(entrys) = fs::read_dir(p) {
            for entry in entrys.flatten() {
                if !cb(entry.path()) {
                    break;
                }
            }
        }
    }
}

pub fn scan_dir_for_dir(p: &Path, cb: &mut dyn FnMut(PathBuf) -> bool) {
    if p.is_dir() {
        if let Ok(entrys) = fs::read_dir(p) {
            for entry in entrys.flatten() {
                let p = entry.path();
                if p.is_dir() && !cb(p) {
                    break;
                }
            }
        }
    }
}

pub fn scan_dir_for_file(p: &Path, cb: &mut dyn FnMut(PathBuf) -> Result<()>) -> Result<()> {
    if p.is_dir() {
        if let Ok(entrys) = fs::read_dir(p) {
            for entry in entrys.flatten() {
                let p = entry.path();
                if p.is_file() {
                    cb(p)?;
                }
            }
        }
    }

    Ok(())
}

pub fn key_value<'a, 'b>(conf_str: &'a str, key: &'b str) -> Result<&'a str> {
    let base = conf_str
        .find(key)
        .ok_or(Error::msg(format!("No {} found", key)))?;

    let mut start = conf_str[base..]
        .find("\"")
        .ok_or(Error::msg(format!("No {} found", key)))?;
    start += base;

    let mut end = conf_str[start + 1..]
        .find("\"")
        .ok_or(Error::msg(format!("No {} found", key)))?;
    end += start + 1;

    Ok(&conf_str[start + 1..end])
}

pub fn verify_content(content: String) -> Option<String> {
    let content = content.trim();
    if !content.is_empty() {
        Some(content.to_string())
    } else {
        None
    }
}