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// Copyright (c) 2021-2022 Miguel Barreto and others
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

//! Contains helpful functions to deal with paths in the context of parsing them for dotfiles
//! configs.

#[cfg(unix)]
use home::home_dir;
#[cfg(unix)]
use std::path::Component;
use std::path::{Path, PathBuf};

use crate::error::{DotfilesError, ErrorType};

/// Converts a file path to absolute if it is relative. If `current_dir` is provided it uses it for
/// the base dir, otherwise it relies on [std::env::current_dir()]
pub fn convert_path_to_absolute(
  file_name: &Path,
  current_dir: Option<&Path>,
) -> Result<PathBuf, DotfilesError> {
  let path = process_home_dir_in_path(&PathBuf::from(file_name));
  Ok(if path.is_absolute() {
    path
  } else {
    let mut new_path = current_dir.map_or_else(
      || std::env::current_dir().map_err(DotfilesError::from_io_error),
      |dir| Ok(dir.to_owned()),
    )?;
    if new_path.is_relative() {
      return Err(DotfilesError::from(
        format!(
          "convert_path_to_absolute got a base dir of {} which is not absolute",
          new_path.to_str().unwrap()
        ),
        ErrorType::CoreError,
      ));
    }
    new_path.push(path);
    new_path
  })
}

/// Checks for ~ and replaces it with a home directory if necessary.
pub fn process_home_dir_in_path(value: &Path) -> PathBuf {
  #[cfg(unix)]
  if let Some(Component::Normal(component)) = value.components().next() {
    if component == "~" {
      // Starts with ~/, should be replaced by home directory
      let mut new_path = home_dir().unwrap();
      let rest_of_path: PathBuf = value.components().skip(1).collect();
      new_path.push(rest_of_path);

      return new_path;
    }
  }
  value.to_owned()
}