/*
 * This file is part of espanso.
 *
 * Copyright (C) 2019-2021 Federico Terzi
 *
 * espanso is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * espanso is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
 */

#[macro_use]
extern crate lazy_static;

#[macro_use]
#[cfg(test)]
extern crate include_dir;

#[macro_use]
#[cfg(test)]
extern crate test_case;

use anyhow::Result;
use thiserror::Error;

mod convert;
mod load;

// TODO: implement
// Use yaml-rust with "preserve-order" = true
// Strategy:
// 1. Backup the current config directory in a zip archive (also with the packages)
// 2. Create a temporary directory alonside the legacy one called "espanso-new"
// 3. Convert all the files and write the output into "espanso-new"
// 4. Rename the legacy dir to "espanso-old"
// 5. Rename new dir to "espanso"
// 6. If the legacy directory was a symlink, try to recreate it (ask the user first)

// TODO: before attempting the migration strategy, check if the current
// espanso config directory is a symlink and, if so, attempt to remap
// the symlink with the new dir (after asking the user)
// This is necessary because in order to be safe, the migration strategy
// creates the new config on a new temporary directory and then "swaps"
// the old with the new one

// TODO: test case with packages

// TODO: keep other non-standard directories such as "images/" and "script/"

// TODO: test also with non-lowercase file names

// TODO: test packages in another directory (a possible strategy is to copy
// the packages dir and the config dir into a temporary one, with the packages
// as a directory at the same level of user/)

// TODO: when dumping the output file, remove the front-matter at the top (generated by YamlEmitter)
// and insert a comment with "Automatically generated from {{file_name}} by migration tool"

#[cfg(test)]
mod tests {
  use std::{fs::create_dir_all, path::{Path}};

  use super::*;
  use include_dir::{include_dir, Dir};
  use tempdir::TempDir;
  use test_case::test_case;

  use pretty_assertions::{assert_eq as assert_peq};

  fn run_with_temp_dir(test_data: &Dir, action: impl FnOnce(&Path, &Path)) {
    let tmp_dir = TempDir::new("espanso-migration").unwrap();
    let tmp_path = tmp_dir.path();
    let legacy_path = tmp_dir.path().join("legacy");
    let expected_path = tmp_dir.path().join("expected");

    for entry in test_data.find("**/*").unwrap() {
      let entry_path = entry.path();

      let entry_path_str = entry_path.to_string_lossy().to_string();
      if entry_path_str.is_empty() {
        continue;
      } 

      let target = tmp_path.join(entry_path);

      if entry_path.extension().is_none() {
        create_dir_all(target).unwrap();
      } else {
        std::fs::write(target, test_data.get_file(entry_path).unwrap().contents()).unwrap();
      }      
    }

    action(&legacy_path, &expected_path);
  }

  static SIMPLE_CASE: Dir = include_dir!("test/simple");
  static BASE_CASE: Dir = include_dir!("test/base");

  #[test_case(&SIMPLE_CASE; "simple case")]
  #[test_case(&BASE_CASE; "base case")]
  fn test_migration(test_data: &Dir) {
    run_with_temp_dir(test_data, |legacy, expected| {
      let legacy_files = load::load(legacy).unwrap();
      let expected_files = load::load(expected).unwrap();

      let converted_files = convert::convert(legacy_files);

      assert_eq!(converted_files.len(), expected_files.len());

      for (file, content) in converted_files {
        assert_peq!(&content, expected_files.get(&file).unwrap());
      }
    });
  }
}