use std::borrow::Cow;

use string_wizard::IndentOptions;
use string_wizard::MagicString;
use string_wizard::MagicStringOptions;
use string_wizard::UpdateOptions;

trait MagicStringExt<'text> {
  fn overwrite(
    &mut self,
    start: usize,
    end: usize,
    content: impl Into<Cow<'text, str>>,
  ) -> &mut Self;

  fn indent_str(&mut self, indent_str: &str) -> &mut Self;
}

impl<'text> MagicStringExt<'text> for MagicString<'text> {
  fn overwrite(
    &mut self,
    start: usize,
    end: usize,
    content: impl Into<Cow<'text, str>>,
  ) -> &mut Self {
    self.update_with(start, end, content, UpdateOptions { overwrite: true, ..Default::default() })
  }
  /// Shortcut for `indent_with(IndentOptions { indent_str: Some(indent_str), ..Default::default() })`
  fn indent_str(&mut self, indent_str: &str) -> &mut Self {
    self.indent_with(IndentOptions { indentor: Some(indent_str), ..Default::default() })
  }
}

mod options {
  use super::*;
  #[test]
  fn stores_source_file_information() {
    let s =
      MagicString::with_options("abc", MagicStringOptions { filename: Some("foo.js".to_string()) });
    assert_eq!(s.filename, Some("foo.js".to_string()))
  }
}

mod append {
  use super::*;

  #[test]
  fn should_append_content() {
    // should append content
    let mut s = MagicString::new("abcdefghijkl");
    s.append("xyz");
    assert_eq!(s.to_string(), "abcdefghijklxyz");
    s.append("xyz");
    assert_eq!(s.to_string(), "abcdefghijklxyzxyz");
  }
}

mod prepend_append_left_right {
  use super::*;

  #[test]
  fn preserves_intended_order() {
    let mut s = MagicString::new("0123456789");
    s.append_left(5, "A");
    assert_eq!(s.to_string(), "01234A56789");
    s.prepend_right(5, "a");
    s.prepend_right(5, "b");
    s.append_left(5, "B");
    s.append_left(5, "C");
    s.prepend_right(5, "c");

    assert_eq!(s.to_string(), "01234ABCcba56789");

    s.prepend_left(5, "<");
    s.prepend_left(5, "{");
    assert_eq!(s.to_string(), "01234{<ABCcba56789");

    s.append_right(5, ">");
    s.append_right(5, "}");
    assert_eq!(s.to_string(), "01234{<ABCcba>}56789");

    s.append_left(5, "(");
    s.append_left(5, "[");
    assert_eq!(s.to_string(), "01234{<ABC([cba>}56789");

    s.prepend_right(5, ")");
    s.prepend_right(5, "]");
    assert_eq!(s.to_string(), "01234{<ABC([])cba>}56789");
  }

  #[test]
  fn preserves_intended_order_at_beginning_of_string() {
    let mut s = MagicString::new("x");
    s.append_left(0, "1");
    s.prepend_left(0, "2");
    s.append_left(0, "3");
    s.prepend_left(0, "4");

    assert_eq!(s.to_string(), "4213x");
  }

  #[test]
  fn preserves_intended_order_at_end_of_string() {
    let mut s = MagicString::new("x");
    s.append_right(1, "1");
    s.prepend_right(1, "2");
    s.append_right(1, "3");
    s.prepend_right(1, "4");

    assert_eq!(s.to_string(), "x4213");
  }
}

mod clone {
  use super::*;

  #[test]
  fn should_clone_a_magic_string() {
    let mut s = MagicString::new("abcdefghijkl");
    s.overwrite(3, 9, "XYZ");
    let c = s.clone();

    assert_eq!(c.to_string(), "abcXYZjkl")
  }
}

mod overwrite {
  use super::*;

  #[test]
  fn should_replace_characters() {
    let mut s = MagicString::new("abcdefghijkl");
    s.overwrite(5, 8, "FGH");
    assert_eq!(s.to_string(), "abcdeFGHijkl");
  }

  // #[test]
  // fn should_throw_an_error_if_overlapping_replacements_are_attempted() {
  //     let mut s = MagicString::new("abcdefghijkl");
  //     s.overwrite(7, 11, "xx");
  //     assert!(std::panic::catch_unwind(|| {
  //         s.clone().overwrite(8, 12, "yy");
  //     })
  //     .is_err())
  // }
}

mod relocate {
  use super::*;

  #[test]
  fn moves_content_from_the_start() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(0, 3, 6);
    assert_eq!(s.to_string(), "defabcghijkl");
  }

  #[test]
  fn moves_content_to_the_start() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(3, 6, 0);
    assert_eq!(s.to_string(), "defabcghijkl");
  }

  #[test]
  fn moves_content_from_the_end() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(9, 12, 6);
    assert_eq!(s.to_string(), "abcdefjklghi");
  }

  #[test]
  fn moves_content_to_the_end() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(6, 9, 12);
    assert_eq!(s.to_string(), "abcdefjklghi");
  }

  #[test]
  fn ignores_redundant_move() {
    let mut s = MagicString::new("abcdefghijkl");
    s.prepend_right(9, "X")
      .relocate(9, 12, 6)
      .append_left(12, "Y")
      // this is redundant – [6,9] is already after [9,12]
      .relocate(6, 9, 12);

    assert_eq!(s.to_string(), "abcdefXjklYghi");
  }

  #[test]
  fn moves_content_to_the_middle() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(3, 6, 9);
    assert_eq!(s.to_string(), "abcghidefjkl");
  }

  #[test]
  fn handles_multiple_moves_of_the_same_snippet() {
    let mut s = MagicString::new("abcdefghijkl");

    s.relocate(0, 3, 6);
    assert_eq!(s.to_string(), "defabcghijkl");

    s.relocate(0, 3, 9);
    assert_eq!(s.to_string(), "defghiabcjkl");
  }

  #[test]
  fn handles_moves_of_adjacent_snippets() {
    let mut s = MagicString::new("abcdefghijkl");

    s.relocate(0, 2, 6);
    assert_eq!(s.to_string(), "cdefabghijkl");
    s.relocate(2, 4, 6);
    assert_eq!(s.to_string(), "efabcdghijkl");
  }

  #[test]
  fn handles_moves_to_same_index() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(0, 2, 6).relocate(3, 5, 6);
    assert_eq!(s.to_string(), "cfabdeghijkl");
  }

  #[test]
  #[should_panic]
  fn refuses_to_move_a_selection_to_inside_itself() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(3, 6, 3);
  }
  #[test]
  #[should_panic]
  fn refuses_to_move_a_selection_to_inside_itself2() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(3, 6, 4);
  }
  #[test]
  #[should_panic]
  fn refuses_to_move_a_selection_to_inside_itself3() {
    let mut s = MagicString::new("abcdefghijkl");
    s.relocate(3, 6, 6);
  }

  #[test]
  fn allows_edits_of_moved_content() {
    let mut s1 = MagicString::new("abcdefghijkl");
    s1.relocate(3, 6, 9);
    s1.overwrite(3, 6, "DEF");
    assert_eq!(s1.to_string(), "abcghiDEFjkl");
    let mut s2 = MagicString::new("abcdefghijkl");
    s2.relocate(3, 6, 9);
    s2.overwrite(4, 5, "E");
    assert_eq!(s2.to_string(), "abcghidEfjkl");
  }

  #[test]
  fn moves_content_inserted_at_end_of_range() {
    let mut s = MagicString::new("abcdefghijkl");
    s.append_left(6, "X").relocate(3, 6, 9);
    assert_eq!(s.to_string(), "abcghidefXjkl");
  }
}

mod indent {
  use string_wizard::IndentOptions;

  use super::*;

  #[test]
  fn should_indent_content_with_a_single_tab_character_by_default() {
    let mut s = MagicString::new("abc\ndef\nghi\njkl");
    s.indent();
    assert_eq!(s.to_string(), "\tabc\n\tdef\n\tghi\n\tjkl")
  }

  #[test]
  fn should_indent_content_with_a_single_tab_character_by_default2() {
    let mut s = MagicString::new("");
    s.prepend("abc\ndef\nghi\njkl");
    s.indent();
    assert_eq!(s.to_string(), "\tabc\n\tdef\n\tghi\n\tjkl");
    let mut s = MagicString::new("");
    s.prepend("abc\ndef");
    s.append("\nghi\njkl");
    s.indent();
    assert_eq!(s.to_string(), "\tabc\n\tdef\n\tghi\n\tjkl")
  }

  #[test]
  fn should_indent_content_using_existing_indentation_as_a_guide() {
    let mut s = MagicString::new("abc\n  def\n    ghi\n  jkl");
    s.indent();
    assert_eq!(s.to_string(), "  abc\n    def\n      ghi\n    jkl");

    s.indent();
    assert_eq!(s.to_string(), "    abc\n      def\n        ghi\n      jkl");
  }

  #[test]
  fn should_disregard_single_space_indentation_when_auto_indenting() {
    let mut s = MagicString::new("abc\n/**\n *comment\n */");
    s.indent();
    assert_eq!(s.to_string(), "\tabc\n\t/**\n\t *comment\n\t */");
  }

  #[test]
  fn should_indent_content_using_the_supplied_indent_string() {
    let mut s = MagicString::new("abc\ndef\nghi\njkl");
    s.indent_str("  ");
    assert_eq!(s.to_string(), "  abc\n  def\n  ghi\n  jkl");
    s.indent_str(">>");
    assert_eq!(s.to_string(), ">>  abc\n>>  def\n>>  ghi\n>>  jkl");
  }

  #[test]
  fn should_indent_content_using_the_empty_string_if_specified() {
    // should indent content using the empty string if specified (i.e. noop)
    let mut s = MagicString::new("abc\ndef\nghi\njkl");
    s.indent_str("");
    assert_eq!(s.to_string(), "abc\ndef\nghi\njkl");
  }
  #[test]
  fn should_prevent_excluded_characters_from_being_indented() {
    let mut s = MagicString::new("abc\ndef\nghi\njkl");
    s.indent_with(IndentOptions { indentor: Some("  "), exclude: &[(7, 15)] });
    assert_eq!(s.to_string(), "  abc\n  def\nghi\njkl");
    s.indent_with(IndentOptions { indentor: Some(">>"), exclude: &[(7, 15)] });
    assert_eq!(s.to_string(), ">>  abc\n>>  def\nghi\njkl");
  }

  #[test]
  fn should_not_add_characters_to_empty_lines() {
    // should indent content using the empty string if specified (i.e. noop)
    let mut s = MagicString::new("\n\nabc\ndef\n\nghi\njkl");
    s.indent();
    assert_eq!(s.to_string(), "\n\n\tabc\n\tdef\n\n\tghi\n\tjkl");
    s.indent();
    assert_eq!(s.to_string(), "\n\n\t\tabc\n\t\tdef\n\n\t\tghi\n\t\tjkl");
  }

  #[test]
  fn should_not_add_characters_to_empty_lines_even_on_windows() {
    // should indent content using the empty string if specified (i.e. noop)
    let mut s = MagicString::new("\r\n\r\nabc\r\ndef\r\n\r\nghi\r\njkl");
    s.indent();
    assert_eq!(s.to_string(), "\r\n\r\n\tabc\r\n\tdef\r\n\r\n\tghi\r\n\tjkl");
    s.indent();
    assert_eq!(s.to_string(), "\r\n\r\n\t\tabc\r\n\t\tdef\r\n\r\n\t\tghi\r\n\t\tjkl");
  }

  #[test]
  fn should_indent_content_with_removals() {
    let mut s = MagicString::new("/* remove this line */\nvar foo = 1;");
    // remove `/* remove this line */\n`
    s.remove(0, 23);
    s.indent();
    assert_eq!(s.to_string(), "\tvar foo = 1;");
  }

  #[test]
  fn should_not_indent_patches_in_the_middle_of_a_line() {
    let mut s = MagicString::new("class Foo extends Bar {}");
    s.overwrite(18, 21, "Baz");
    assert_eq!(s.to_string(), "class Foo extends Baz {}");
    s.indent();
    assert_eq!(s.to_string(), "\tclass Foo extends Baz {}");
  }

  #[test]
  fn should_ignore_the_end_of_each_exclude_range() {
    let mut s = MagicString::new("012\n456\n89a\nbcd");
    s.indent_with(IndentOptions { indentor: Some(">"), exclude: &[(0, 3)] });
    assert_eq!(s.to_string(), "012\n>456\n>89a\n>bcd");
  }
}

mod misc {
  use super::*;

  #[test]
  fn should_append_content() {
    // should append content
    let mut s = MagicString::new("abcdefghijkl");
    s.prepend("xyz");
    assert_eq!(s.to_string(), "xyzabcdefghijkl");
    s.prepend("xyz");
    assert_eq!(s.to_string(), "xyzxyzabcdefghijkl");
  }

  #[test]
  fn remove() {
    // should append content
    let mut s = MagicString::new("0123456");
    assert_eq!(s.remove(0, 3).to_string(), "3456");
    assert_eq!(s.remove(3, 7).to_string(), "");
  }

  #[test]
  fn allow_empty_input() {
    let mut s = MagicString::new("");
    s.append("xyz");
    assert_eq!(s.to_string(), "xyz");
    s.prepend("xyz");
    assert_eq!(s.to_string(), "xyzxyz");
  }
}