require File.expand_path('spec/spec_helper')

describe Ruco::Editor do
  def write(content)
    File.open(@file,'w'){|f| f.write(content) }
  end

  let(:editor){ Ruco::Editor.new(@file, :lines => 3, :columns => 5, :line_scrolling_offset => 5, :column_scrolling_offset => 5) }

  before do
    @file = 'spec/temp.txt'
  end

  it "reads tab as spaces" do
    write("\t\ta")
    editor.view.should == "    a\n\n\n"
  end

  describe :move do
    before do
      write("    \n    \n    ")
    end

    it "starts at 0,0" do
      editor.cursor.should == [0,0]
    end

    it "can move" do
      editor.move(:relative, 1,2)
      editor.cursor.should == [1,2]
      editor.move(:relative, 1,1)
      editor.cursor.should == [2,3]
    end

    it "can move in empty file" do
      write("\n\n\n")
      editor.move(:relative, 2,0)
      editor.cursor.should == [2,0]
    end

    it "cannot move left/top off screen" do
      editor.move(:relative, -1,-1)
      editor.cursor.should == [0,0]
    end

    it "cannot move right of characters" do
      editor.move(:relative, 2,6)
      editor.cursor.should == [2,4]
    end

    it "stays in last line when moving past lines" do
      write("    ")
      editor.move(:relative, 6,3)
      editor.cursor.should == [0,3]
    end

    describe 'column scrolling' do
      it "can scroll columns" do
        write("123456789\n123")
        editor.move(:relative, 0,4)
        editor.view.should == "12345\n123\n\n"
        editor.cursor.column.should == 4

        editor.move(:relative, 0,1)
        editor.view.should == "6789\n\n\n"
        editor.cursor.column.should == 0
      end

      it "cannot scroll past the screen" do
        write('123456789')
        editor.move(:relative, 0,4)
        6.times{ editor.move(:relative, 0,1) }
        editor.view.should == "6789\n\n\n"
        editor.cursor.column.should == 4
      end

      it "can scroll columns backwards" do
        write('123456789')
        editor.move(:relative, 0,5)
        editor.view.should == "6789\n\n\n"

        editor.move(:relative, 0,-1)
        editor.view.should == "12345\n\n\n"
        editor.cursor.column.should == 4
      end
    end

    describe 'line scrolling' do
      before do
        write("1\n2\n3\n4\n5\n6\n7\n8\n9")
      end

      it "can scroll lines down (at maximum of screen size)" do
        editor.move(:relative, 2,0)
        editor.view.should == "1\n2\n3\n"

        editor.move(:relative, 1,0)
        editor.view.should == "4\n5\n6\n"
        editor.cursor.line.should == 0
      end

      it "can scroll till end of file" do
        editor.move(:relative, 15,0)
        editor.view.should == "9\n\n\n"
        editor.cursor.line.should == 0
      end
    end

    describe :to do
      it "cannot move outside of text (bottom/right)" do
        write("123\n456")
        editor.move(:to, 10,10)
        editor.cursor.should == [1,3]
      end

      it "cannot move outside of text (top/left)" do
        write("123\n456")
        editor.move(:relative, 1,1)
        editor.move(:to, -10,-10)
        editor.cursor.should == [0,0]
      end
    end

    describe :to_eol do
      before do
        write("\n aa \n  ")
      end

      it 'stays at start when line is empty' do
        editor.move :to_eol
        editor.cursor.should == [0,0]
      end

      it 'moves after last word if cursor was before it' do
        editor.move(:relative, 1,1)
        editor.move :to_eol
        editor.cursor.should == [1,3]
      end

      it 'moves after last whitespace if cursor was after last word' do
        editor.move(:relative, 1,3)
        editor.move :to_eol
        editor.cursor.should == [1,4]
      end

      it 'moves after last work if cursor was after last whitespace' do
        editor.move(:relative, 1,4)
        editor.move :to_eol
        editor.cursor.should == [1,3]
      end
    end

    describe :to_bol do
      before do
        write("\n  aa \n  ")
      end

      it 'stays at start when line is empty' do
        editor.move :to_bol
        editor.cursor.should == [0,0]
      end

      it 'moves before first work if at start of line' do
        editor.move(:relative, 1,0)
        editor.move :to_bol
        editor.cursor.should == [1,2]
      end

      it 'moves to start of line if before first word' do
        editor.move(:relative, 1,1)
        editor.move :to_bol
        editor.cursor.should == [1,0]

        editor.move(:relative, 0,2)
        editor.move :to_bol
        editor.cursor.should == [1,0]
      end

      it 'moves before first word if inside line' do
        editor.move(:relative, 1,5)
        editor.move :to_bol
        editor.cursor.should == [1,2]
      end
    end
  end

  describe :selecting do
    before do
      write('012345678')
    end

    it "remembers the selection" do
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.selection.should == ([0,0]..[0,4])
    end

    it "expands the selection" do
      editor.selecting do
        move(:to, 0, 4)
        move(:to, 0, 6)
      end
      editor.selection.should == ([0,0]..[0,6])
    end

    it "expand an old selection" do
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.selecting do
        move(:relative, 0, 2)
      end
      editor.selection.should == ([0,0]..[0,6])
    end

    it "can select backwards" do
      editor.move(:to, 0, 4)
      editor.selecting do
        move(:relative, 0, -2)
      end
      editor.selecting do
        move(:relative, 0, -2)
      end
      editor.selection.should == ([0,0]..[0,4])
    end

    it "can select multiple lines" do
      write("012\n345\n678")
      editor.move(:to, 0, 2)
      editor.selecting do
        move(:relative, 1, 0)
      end
      editor.selecting do
        move(:relative, 1, 0)
      end
      editor.selection.should == ([0,2]..[2,2])
    end

    it "clears the selection once I move" do
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.move(:relative, 0, 2)
      editor.selection.should == nil
    end

    it "replaces the selection with insert" do
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.insert('X')
      editor.selection.should == nil
      editor.cursor.should == [0,1]
      editor.move(:to, 0,0)
      editor.view.should == "X4567\n\n\n"
    end

    it "replaces the multi-line-selection with insert" do
      write("123\n456\n789")
      editor.move(:to, 0,1)
      editor.selecting do
        move(:to, 1,2)
      end
      editor.insert('X')
      editor.selection.should == nil
      editor.cursor.should == [0,2]
      editor.move(:to, 0,0)
      editor.view.should == "1X6\n789\n\n"
    end

    it "deletes selection delete" do
      write("123\n456\n789")
      editor.move(:to, 0,1)
      editor.selecting do
        move(:to, 1,2)
      end
      editor.delete(1)
      editor.cursor.should == [0,1]
      editor.move(:to, 0,0)
      editor.view.should == "16\n789\n\n"
    end
  end

  describe :text_in_selection do
    before do
      write("123\n456\n789")
    end

    it "returns '' if nothing is selected" do
      editor.selecting do
        move(:to, 1,1)
      end
      editor.text_in_selection.should == "123\n4"
    end

    it "returns selected text" do
      editor.text_in_selection.should == ''
    end
  end

  describe :color_mask do
    it "is empty by default" do
      editor.color_mask.should == [nil,nil,nil]
    end

    it "shows one-line selection" do
      write('12345678')
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.color_mask.should == [
        [[0,262144],[4,0]],
        nil,
        nil,
      ]
    end

    it "shows multi-line selection" do
      write("012\n345\n678")
      editor.move(:to, 0,1)
      editor.selecting do
        move(:to, 1, 1)
      end
      editor.color_mask.should == [
        [[1,262144],[5,0]],
        [[0,262144],[1,0]],
        nil,
      ]
    end

    it "shows the selection from offset" do
      write('12345678')
      editor.move(:to, 0, 2)
      editor.selecting do
        move(:to, 0, 4)
      end
      editor.color_mask.should == [
        [[2,262144], [4,0]],
        nil,
        nil,
      ]
    end

    it "shows the selection in nth line" do
      write("\n12345678")
      editor.move(:to, 1, 2)
      editor.selecting do
        move(:to, 1, 4)
      end
      editor.color_mask.should == [
        nil,
        [[2,262144], [4,0]],
        nil,
      ]
    end

    it "shows multi-line selection in scrolled space" do
      write("\n\n\n\n\n0123456789\n0123456789\n0123456789\n\n")
      editor.move(:to, 5,7)
      editor.move(:relative, 0, 1)
      editor.selecting do
        move(:relative, 2, 1)
      end
      editor.view.should == "789\n789\n789\n"
      editor.cursor.should == [2,2]
      editor.color_mask.should == [
        [[1,262144],[5,0]], # start to end of screen
        [[0,262144],[5,0]], # 0 to end of screen
        [[0,262144],[2,0]], # 0 to end of selection
      ]
    end
  end

  describe :view do
    before do
      write('')
    end

    it "displays an empty screen" do
      editor.view.should == "\n\n\n"
    end

    it "displays short file content" do
      write('xxx')
      editor.view.should == "xxx\n\n\n"
    end

    it "displays long file content" do
      write('1234567')
      editor.view.should == "12345\n\n\n"
    end

    it "displays multiline-file content" do
      write("xxx\nyyy\nzzz\niii")
      editor.view.should == "xxx\nyyy\nzzz\n"
    end
  end

  describe :insert do
    before do
      write('')
    end

    it "can insert new chars" do
      write('123')
      editor.move(:relative, 0,1)
      editor.insert('ab')
      editor.view.should == "1ab23\n\n\n"
      editor.cursor.should == [0,3]
    end

    it "can insert new newlines" do
      editor.insert("ab\nc")
      editor.view.should == "ab\nc\n\n"
      editor.cursor.should == [1,1]
    end

    it "jumps to correct column when inserting newline" do
      write("abc\ndefg")
      editor.move(:relative, 1,2)
      editor.insert("1\n23")
      editor.view.should == "abc\nde1\n23fg\n"
      editor.cursor.should == [2,2]
    end

    it "jumps to correct column when inserting 1 newline" do
      write("abc\ndefg")
      editor.move(:relative, 1,2)
      editor.insert("\n")
      editor.view.should == "abc\nde\nfg\n"
      editor.cursor.should == [2,0]
    end

    it "can add newlines to the end" do
      write('')
      editor.insert("\n")
      editor.insert("\n")
      editor.cursor.should == [2,0]
    end

    it "can add newlines to the moveable end" do
      write('abc')
      editor.move(:relative, 0,3)
      editor.insert("\n")
      editor.insert("\n")
      editor.cursor.should == [2,0]
    end

    it "inserts tab as spaces" do
      editor.insert("\t")
      editor.view.should == "  \n\n\n"
      editor.cursor.should == [0,2]
    end
  end

  describe :save do
    it 'stores the file' do
      write('xxx')
      editor.insert('a')
      editor.save
      File.read(@file).should == 'axxx'
    end

    it 'creates the file' do
      `rm #{@file}`
      editor.insert('a')
      editor.save
      File.read(@file).should == 'a'
    end
  end

  describe :delete do
    it 'removes a char' do
      write('123')
      editor.delete(1)
      editor.view.should == "23\n\n\n"
      editor.cursor.should == [0,0]
    end

    it 'removes a line' do
      write("123\n45")
      editor.move(:relative, 0,3)
      editor.delete(1)
      editor.view.should == "12345\n\n\n"
      editor.cursor.should == [0,3]
    end

    it "cannot backspace over 0,0" do
      write("aa")
      editor.move(:relative, 0,1)
      editor.delete(-3)
      editor.view.should == "a\n\n\n"
      editor.cursor.should == [0,0]
    end

    it 'backspaces a char' do
      write('123')
      editor.move(:relative, 0,3)
      editor.delete(-1)
      editor.view.should == "12\n\n\n"
      editor.cursor.should == [0,2]
    end

    it 'backspaces a newline' do
      write("1\n234")
      editor.move(:relative, 1,0)
      editor.delete(-1)
      editor.view.should == "1234\n\n\n"
      editor.cursor.should == [0,1]
    end
  end

  describe :changes? do
    it "is unchanged by default" do
      editor.modified?.should == false
    end

    it "is changed after insert" do
      editor.insert('x')
      editor.modified?.should == true
    end

    it "is changed after delete" do
      editor.delete(1)
      editor.modified?.should == true
    end

    it "is not changed after move" do
      editor.move(:relative, 1,1)
      editor.modified?.should == false
    end

    it "is unchanged after save" do
      editor.insert('x')
      editor.save
      editor.modified?.should == false
    end
  end

  describe :find do
    before do
      write("\n ab\n ab")
    end

    it "moves to first occurrence" do
      editor.find('ab')
      editor.cursor.should == [1,1]
    end

    it "moves to next occurrence" do
      editor.move(:relative, 1,1)
      editor.find('ab')
      editor.cursor.should == [2,1]
    end

    it "stays in place when nothing was found" do
      editor.move(:relative, 2,1)
      editor.find('ab')
      editor.cursor.should == [2,1]
    end
  end

  describe :delete_line do
    before do
      write("1\nlonger_than_columns\n56789")
    end

    it "removes the current line from first char" do
      editor.move(:to, 1, 0)
      editor.delete_line
      editor.view.should == "1\n56789\n\n"
      editor.cursor.should == [1, 0]
    end

    it "removes the current line from last char" do
      editor.move(:to, 1, 3)
      editor.delete_line
      editor.view.should == "1\n56789\n\n"
      editor.cursor.should == [1, 3]
    end

    it "can remove the first line" do
      editor.delete_line
      editor.view.should == "longe\n56789\n\n"
      editor.cursor.should == [0, 0]
    end

    it "can remove the last line" do
      write("aaa")
      editor.delete_line
      editor.view.should == "\n\n\n"
      editor.cursor.should == [0, 0]
    end

    it "can remove the last line with lines remaining" do
      write("aaa\nbbb")
      editor.move(:to, 1,1)
      editor.delete_line
      editor.view.should == "aaa\n\n\n"
      editor.cursor.should == [0, 1]
    end

    it "jumps to end of next lines end when put of space" do
      write("1\n234\n5")
      editor.move(:to, 1, 3)
      editor.delete_line
      editor.cursor.should == [1, 1]
    end

    it "can remove lines outside of initial screen" do
      write("0\n1\n2\n3\n4\n5\n6\n7\n8\n9\n")
      editor.move(:to, 5, 0)
      editor.move(:to, 6, 1)
      editor.delete_line
      editor.view.should == "5\n7\n8\n"
      editor.cursor.should == [1, 1]
    end
  end
end