local helpers = require('test.functional.helpers')(after_each)
local global_helpers = require('test.helpers')
local Screen = require('test.functional.ui.screen')

local clear = helpers.clear
local curbuf_contents = helpers.curbuf_contents
local command = helpers.command
local eq, neq, matches = helpers.eq, helpers.neq, helpers.matches
local getcompletion = helpers.funcs.getcompletion

describe(':checkhealth', function()
  it("detects invalid $VIMRUNTIME", function()
    clear({
      env={ VIMRUNTIME='bogus', },
    })
    local status, err = pcall(command, 'checkhealth')
    eq(false, status)
    eq('Invalid $VIMRUNTIME: bogus', string.match(err, 'Invalid.*'))
  end)
  it("detects invalid 'runtimepath'", function()
    clear()
    command('set runtimepath=bogus')
    local status, err = pcall(command, 'checkhealth')
    eq(false, status)
    eq("Invalid 'runtimepath'", string.match(err, 'Invalid.*'))
  end)
  it("detects invalid $VIM", function()
    clear()
    -- Do this after startup, otherwise it just breaks $VIMRUNTIME.
    command("let $VIM='zub'")
    command("checkhealth nvim")
    matches('ERROR $VIM .* zub', curbuf_contents())
  end)
  it('completions can be listed via getcompletion()', function()
    clear()
    eq('nvim', getcompletion('nvim', 'checkhealth')[1])
    eq('provider', getcompletion('prov', 'checkhealth')[1])
    eq('vim.lsp', getcompletion('vim.ls', 'checkhealth')[1])
    neq('vim', getcompletion('^vim', 'checkhealth')[1])  -- should not complete vim.health
  end)
end)

describe('health.vim', function()
  before_each(function()
    clear{args={'-u', 'NORC'}}
    -- Provides functions:
    --    health#broken#check()
    --    health#success1#check()
    --    health#success2#check()
    command("set runtimepath+=test/functional/fixtures")
  end)

  describe(":checkhealth", function()
    it("functions health#report_*() render correctly", function()
      command("checkhealth full_render")
      helpers.expect([[

      ==============================================================================
      full_render: health#full_render#check

      report 1 ~
      - OK life is fine
      - WARNING no what installed
        - ADVICE:
          - pip what
          - make what

      report 2 ~
      - stuff is stable
      - ERROR why no hardcopy
        - ADVICE:
          - :help |:hardcopy|
          - :help |:TOhtml|
      ]])
    end)

    it("concatenates multiple reports", function()
      command("checkhealth success1 success2 test_plug")
      helpers.expect([[

        ==============================================================================
        success1: health#success1#check

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here

        ==============================================================================
        success2: health#success2#check

        another 1 ~
        - OK ok

        ==============================================================================
        test_plug: require("test_plug.health").check()

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here
        ]])
    end)

    it("lua plugins, skips vimscript healthchecks with the same name", function()
      command("checkhealth test_plug")
      -- Existing file in test/functional/fixtures/lua/test_plug/autoload/health/test_plug.vim
      -- and the Lua healthcheck is used instead.
      helpers.expect([[

        ==============================================================================
        test_plug: require("test_plug.health").check()

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here
        ]])
    end)

    it("lua plugins submodules", function()
      command("checkhealth test_plug.submodule")
      helpers.expect([[

        ==============================================================================
        test_plug.submodule: require("test_plug.submodule.health").check()

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here
        ]])
    end)

    it("lua plugins submodules with expression '*'", function()
      command("checkhealth test_plug*")
      local buf_lines = helpers.curbuf('get_lines', 0, -1, true)
      -- avoid dealing with path separators
      local received = table.concat(buf_lines, '\n', 1, #buf_lines - 5)
      local expected = helpers.dedent([[

        ==============================================================================
        test_plug: require("test_plug.health").check()

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here

        ==============================================================================
        test_plug.submodule: require("test_plug.submodule.health").check()

        report 1 ~
        - OK everything is fine

        report 2 ~
        - OK nothing to see here

        ==============================================================================
        test_plug.submodule_empty: require("test_plug.submodule_empty.health").check()

        - ERROR The healthcheck report for "test_plug.submodule_empty" plugin is empty.

        ==============================================================================
        test_plug.submodule_failed: require("test_plug.submodule_failed.health").check()

        - ERROR Failed to run healthcheck for "test_plug.submodule_failed" plugin. Exception:
          function health#check, line 25]])
      eq(expected, received)
    end)

    it("gracefully handles broken healthcheck", function()
      command("checkhealth broken")
      helpers.expect([[

        ==============================================================================
        broken: health#broken#check

        - ERROR Failed to run healthcheck for "broken" plugin. Exception:
          function health#check[25]..health#broken#check, line 1
          caused an error
        ]])
    end)

    it("... including empty reports", function()
      command("checkhealth test_plug.submodule_empty")
      helpers.expect([[

      ==============================================================================
      test_plug.submodule_empty: require("test_plug.submodule_empty.health").check()

      - ERROR The healthcheck report for "test_plug.submodule_empty" plugin is empty.
      ]])
    end)

    it("gracefully handles broken lua healthcheck", function()
      command("checkhealth test_plug.submodule_failed")
      local buf_lines = helpers.curbuf('get_lines', 0, -1, true)
      local received = table.concat(buf_lines, '\n', 1, #buf_lines - 5)
      -- avoid dealing with path separators
      local lua_err = "attempt to perform arithmetic on a nil value"
      local last_line = buf_lines[#buf_lines - 4]
      assert(string.find(last_line, lua_err) ~= nil, "Lua error not present")

      local expected = global_helpers.dedent([[

        ==============================================================================
        test_plug.submodule_failed: require("test_plug.submodule_failed.health").check()

        - ERROR Failed to run healthcheck for "test_plug.submodule_failed" plugin. Exception:
          function health#check, line 25]])
      eq(expected, received)
    end)

    it("highlights OK, ERROR", function()
      local screen = Screen.new(50, 12)
      screen:attach()
      screen:set_default_attr_ids({
        Ok = { foreground = Screen.colors.Grey3, background = 6291200 },
        Error = { foreground = Screen.colors.Grey100, background = Screen.colors.Red },
        Heading = { foreground = tonumber('0x6a0dad') },
        Bar = { foreground = Screen.colors.LightGrey, background = Screen.colors.DarkGrey },
      })
      command("checkhealth foo success1")
      command("set nowrap laststatus=0")
      screen:expect{grid=[[
        ^                                                  |
        {Bar:──────────────────────────────────────────────────}|
        {Heading:foo: }                                             |
                                                          |
        - {Error:ERROR} No healthcheck found for "foo" plugin.    |
                                                          |
        {Bar:──────────────────────────────────────────────────}|
        {Heading:success1: health#success1#check}                   |
                                                          |
        {Heading:report 1}                                          |
        - {Ok:OK} everything is fine                           |
                                                          |
      ]]}
    end)

    it("gracefully handles invalid healthcheck", function()
      command("checkhealth non_existent_healthcheck")
      -- luacheck: ignore 613
      helpers.expect([[

        ==============================================================================
        non_existent_healthcheck: 

        - ERROR No healthcheck found for "non_existent_healthcheck" plugin.
        ]])
    end)

    it("does not use vim.health as a healtcheck", function()
      -- vim.health is not a healthcheck
      command("checkhealth vim")
      helpers.expect([[
      ERROR: No healthchecks found.]])
    end)
  end)
end)

describe(':checkhealth provider', function()
  it("works correctly with a wrongly configured 'shell'", function()
    clear()
    command([[set shell=echo\ WRONG!!!]])
    command('let g:loaded_perl_provider = 0')
    command('let g:loaded_python3_provider = 0')
    command('checkhealth provider')
    eq(nil, string.match(curbuf_contents(), 'WRONG!!!'))
  end)
end)