local helpers = require('test.functional.helpers')(after_each)
local eq, clear, call, write_file, command =
  helpers.eq, helpers.clear, helpers.call, helpers.write_file,
  helpers.command
local exc_exec = helpers.exc_exec
local eval = helpers.eval
local is_os = helpers.is_os

describe('executable()', function()
  before_each(clear)

  it('returns 1 for commands in $PATH', function()
    local exe = is_os('win') and 'ping' or 'ls'
    eq(1, call('executable', exe))
    command('let $PATH = fnamemodify("./test/functional/fixtures/bin", ":p")')
    eq(1, call('executable', 'null'))
    eq(1, call('executable', 'true'))
    eq(1, call('executable', 'false'))
  end)

  if is_os('win') then
    it('exepath respects shellslash', function()
      command('let $PATH = fnamemodify("./test/functional/fixtures/bin", ":p")')
      eq([[test\functional\fixtures\bin\null.CMD]], call('fnamemodify', call('exepath', 'null'), ':.'))
      command('set shellslash')
      eq('test/functional/fixtures/bin/null.CMD', call('fnamemodify', call('exepath', 'null'), ':.'))
    end)

    it('stdpath respects shellslash', function()
      eq([[build\Xtest_xdg\share\nvim-data]], call('fnamemodify', call('stdpath', 'data'), ':.'))
      command('set shellslash')
      eq('build/Xtest_xdg/share/nvim-data', call('fnamemodify', call('stdpath', 'data'), ':.'))
    end)
  end

  it('fails for invalid values', function()
    for _, input in ipairs({'v:null', 'v:true', 'v:false', '{}', '[]'}) do
      eq('Vim(call):E1174: String required for argument 1',
         exc_exec('call executable('..input..')'))
    end
    command('let $PATH = fnamemodify("./test/functional/fixtures/bin", ":p")')
    for _, input in ipairs({'v:null', 'v:true', 'v:false'}) do
      eq('Vim(call):E1174: String required for argument 1',
         exc_exec('call executable('..input..')'))
    end
  end)

  it('returns 0 for empty strings', function()
    eq(0, call('executable', '""'))
  end)

  it('returns 0 for non-existent files', function()
    eq(0, call('executable', 'no_such_file_exists_209ufq23f'))
  end)

  it('sibling to nvim binary', function()
    -- Some executable in build/bin/, *not* in $PATH nor CWD.
    local sibling_exe = 'printargs-test'
    -- Windows: siblings are in Nvim's "pseudo-$PATH".
    local expected = is_os('win') and 1 or 0
    if is_os('win') then
      eq('arg1=lemon;arg2=sky;arg3=tree;',
         call('system', sibling_exe..' lemon sky tree'))
    end
    eq(expected, call('executable', sibling_exe))
  end)

  describe('exec-bit', function()
    setup(function()
      clear()
      write_file('Xtest_not_executable', 'non-executable file')
      write_file('Xtest_executable', 'executable file (exec-bit set)')
      if not is_os('win') then  -- N/A for Windows.
        call('system', {'chmod', '-x', 'Xtest_not_executable'})
        call('system', {'chmod', '+x', 'Xtest_executable'})
      end
    end)

    teardown(function()
      os.remove('Xtest_not_executable')
      os.remove('Xtest_executable')
    end)

    it('not set', function()
      eq(0, call('executable', 'Xtest_not_executable'))
      eq(0, call('executable', './Xtest_not_executable'))
    end)

    it('set, unqualified and not in $PATH', function()
      eq(0, call('executable', 'Xtest_executable'))
    end)

    it('set, qualified as a path', function()
      local expected = is_os('win') and 0 or 1
      eq(expected, call('executable', './Xtest_executable'))
    end)
  end)
end)

describe('executable() (Windows)', function()
  if not is_os('win') then
    pending('N/A for non-windows')
    return
  end

  local exts = {'bat', 'exe', 'com', 'cmd'}
  setup(function()
    for _, ext in ipairs(exts) do
      write_file('test_executable_'..ext..'.'..ext, '')
    end
    write_file('test_executable_zzz.zzz', '')
  end)

  teardown(function()
    for _, ext in ipairs(exts) do
      os.remove('test_executable_'..ext..'.'..ext)
    end
    os.remove('test_executable_zzz.zzz')
  end)

  it('tries default extensions on a filename if $PATHEXT is empty', function()
    -- Empty $PATHEXT defaults to ".com;.exe;.bat;.cmd".
    clear({env={PATHEXT=''}})
    for _,ext in ipairs(exts) do
      eq(1, call('executable', 'test_executable_'..ext))
    end
    eq(0, call('executable', 'test_executable_zzz'))
  end)

  it('tries default extensions on a filepath if $PATHEXT is empty', function()
    -- Empty $PATHEXT defaults to ".com;.exe;.bat;.cmd".
    clear({env={PATHEXT=''}})
    for _,ext in ipairs(exts) do
      eq(1, call('executable', '.\\test_executable_'..ext))
    end
    eq(0, call('executable', '.\\test_executable_zzz'))
  end)

  it('system([…]), jobstart([…]) use $PATHEXT #9569', function()
    -- Empty $PATHEXT defaults to ".com;.exe;.bat;.cmd".
    clear({env={PATHEXT=''}})
    -- Invoking `cmdscript` should find/execute `cmdscript.cmd`.
    eq('much success\n', call('system', {'test/functional/fixtures/cmdscript'}))
    assert(0 < call('jobstart', {'test/functional/fixtures/cmdscript'}))
  end)

  it('full path with extension', function()
    -- Empty $PATHEXT defaults to ".com;.exe;.bat;.cmd".
    clear({env={PATHEXT=''}})
    -- Some executable we can expect in the test env.
    local exe = 'printargs-test'
    local exedir = eval("fnamemodify(v:progpath, ':h')")
    local exepath = exedir..'/'..exe..'.exe'
    eq(1, call('executable', exepath))
    eq('arg1=lemon;arg2=sky;arg3=tree;',
       call('system', exepath..' lemon sky tree'))
  end)

  it('full path without extension', function()
    -- Empty $PATHEXT defaults to ".com;.exe;.bat;.cmd".
    clear({env={PATHEXT=''}})
    -- Some executable we can expect in the test env.
    local exe = 'printargs-test'
    local exedir = eval("fnamemodify(v:progpath, ':h')")
    local exepath = exedir..'/'..exe
    eq('arg1=lemon;arg2=sky;arg3=tree;',
       call('system', exepath..' lemon sky tree'))
     eq(1, call('executable', exepath))
  end)

  it('respects $PATHEXT when trying extensions on a filename', function()
    clear({env={PATHEXT='.zzz'}})
    for _,ext in ipairs(exts) do
      eq(0, call('executable', 'test_executable_'..ext))
    end
    eq(1, call('executable', 'test_executable_zzz'))
  end)

  it('respects $PATHEXT when trying extensions on a filepath', function()
    clear({env={PATHEXT='.zzz'}})
    for _,ext in ipairs(exts) do
      eq(0, call('executable', '.\\test_executable_'..ext))
    end
    eq(1, call('executable', '.\\test_executable_zzz'))
  end)

  it("with weird $PATHEXT", function()
    clear({env={PATHEXT=';'}})
    eq(0, call('executable', '.\\test_executable_zzz'))
    clear({env={PATHEXT=';;;.zzz;;'}})
    eq(1, call('executable', '.\\test_executable_zzz'))
  end)

  it("unqualified filename, Unix-style 'shell'", function()
    clear({env={PATHEXT=''}})
    command('set shell=sh')
    for _,ext in ipairs(exts) do
      eq(1, call('executable', 'test_executable_'..ext..'.'..ext))
    end
    eq(1, call('executable', 'test_executable_zzz.zzz'))
  end)

  it("relative path, Unix-style 'shell' (backslashes)", function()
    clear({env={PATHEXT=''}})
    command('set shell=bash.exe')
    for _,ext in ipairs(exts) do
      eq(1, call('executable', '.\\test_executable_'..ext..'.'..ext))
      eq(1, call('executable', './test_executable_'..ext..'.'..ext))
    end
    eq(1, call('executable', '.\\test_executable_zzz.zzz'))
    eq(1, call('executable', './test_executable_zzz.zzz'))
  end)

  it('unqualified filename, $PATHEXT contains dot', function()
    clear({env={PATHEXT='.;.zzz'}})
    for _,ext in ipairs(exts) do
      eq(1, call('executable', 'test_executable_'..ext..'.'..ext))
    end
    eq(1, call('executable', 'test_executable_zzz.zzz'))
    clear({env={PATHEXT='.zzz;.'}})
    for _,ext in ipairs(exts) do
      eq(1, call('executable', 'test_executable_'..ext..'.'..ext))
    end
    eq(1, call('executable', 'test_executable_zzz.zzz'))
  end)

  it('relative path, $PATHEXT contains dot (backslashes)', function()
    clear({env={PATHEXT='.;.zzz'}})
    for _,ext in ipairs(exts) do
      eq(1, call('executable', '.\\test_executable_'..ext..'.'..ext))
      eq(1, call('executable', './test_executable_'..ext..'.'..ext))
    end
    eq(1, call('executable', '.\\test_executable_zzz.zzz'))
    eq(1, call('executable', './test_executable_zzz.zzz'))
  end)

  it('ignores case of extension', function()
    clear({env={PATHEXT='.ZZZ'}})
    eq(1, call('executable', 'test_executable_zzz.zzz'))
  end)

  it('relative path does not search $PATH', function()
    clear({env={PATHEXT=''}})
    eq(0, call('executable', './System32/notepad.exe'))
    eq(0, call('executable', '.\\System32\\notepad.exe'))
    eq(0, call('executable', '../notepad.exe'))
    eq(0, call('executable', '..\\notepad.exe'))
  end)
end)