local N = require('NTest')("selftest")
local orig_node = node
local metatest
local async
local expected = {}
local failed, passed = 0,0
local load_tests2
local function load_tests()
  --
  -- Basic tests
  --
  metatest('simple assert passes', function()
    ok(2 == 2, '2==2')
  end, {'2==2'}, {})

  metatest('simple negative assert fails', function()
    nok(2 == 2, '2==2')
    nok(false, 'unreachable code')
  end, {}, {'2==2'})

  metatest('simple assert fails', function()
    ok(1 == 2, '1~=2')
    ok(true, 'unreachable code')
  end, {}, {'1~=2'})

  metatest('simple negative assert passes', function()
    nok(1 == 2, '1~=2')
  end, {'1~=2'}, {})

  metatest('ok without a message', function()
    ok(1 == 1)
    ok(1 == 2)
  end, {'NTest_NTest.lua:31'}, {'NTest_NTest.lua:32'})

  metatest('nok without a message', function()
    nok(1 == "")
    nok(1 == 1)
  end, {'NTest_NTest.lua:36'}, {'NTest_NTest.lua:37'})

  --
  -- Equality tests
  --
  metatest('eq nil', function()
    ok(eq(nil, nil), 'nil == nil')
    nok(eq("", nil), '"" != nil')
    nok(eq(nil, ""), 'nil != ""')
  end, {'nil == nil', '"" != nil', 'nil != ""'}, {})

  metatest('eq primitives', function()
    ok(eq('foo', 'foo'), 'str == str')
    nok(eq('foo', 'bar'), 'str != str')
    ok(eq(123, 123), 'num == num')
    nok(eq(123, 12), 'num != num')
  end, {'str == str', 'str != str', 'num == num', 'num != num'}, {})

  metatest('eq arrays', function()
    ok(eq({}, {}), 'empty')
    ok(eq({1, 2}, {1, 2}), 'equal')
    nok(eq({1, 2}, {2, 1}), 'swapped')
    nok(eq({1, 2, 3}, {1, 2}), 'longer')
    nok(eq({1, 2}, {1, 2, 3}), 'shorter')
  end, {'empty', 'equal', 'swapped', 'longer', 'shorter'}, {})

  metatest('eq objects', function()
    ok(eq({}, {}), 'empty')
    ok(eq({a=1,b=2}, {a=1,b=2}), 'equal')
    ok(eq({b=2,a=1}, {a=1,b=2}), 'swapped')
    nok(eq({a=1,b=2}, {a=1,b=3}), 'not equal')
  end, {'empty', 'equal', 'swapped', 'not equal'}, {})

  metatest('eq nested objects', function()
    ok(eq({
      ['1'] = { name = 'mhc', age = 28 },
      ['2'] = { name = 'arb', age = 26 }
    }, {
      ['1'] = { name = 'mhc', age = 28 },
      ['2'] = { name = 'arb', age = 26 }
    }), 'equal')
    ok(eq({
      ['1'] = { name = 'mhc', age = 28 },
      ['2'] = { name = 'arb', age = 26 }
    }, {
      ['1'] = { name = 'mhc', age = 28 },
      ['2'] = { name = 'arb', age = 27 }
    }), 'not equal')
  end, {'equal'}, {'not equal', 'different numbers expected 26 vs. 27'})

  metatest('eq functions', function()
    ok(eq(function(x) return x end, function(x) return x end), 'equal')
    nok(eq(function(z) return x + z end, function(z) return y + z end), 'wrong variable') -- luacheck: ignore
    nok(eq(function(x) return x*2 end, function(x) return x+2 end), 'wrong code')
  end, {'equal', 'wrong variable', 'wrong code'}, {})

  metatest('eq different types', function()
    local eqos = eq({a=1,b=2}, "text")
    ok(eq(eqos.msg, "type 1 is table, type 2 is string"), 'object/string')
    local eqfn = eq(function(x) return x end, 12)
    ok(eq(eqfn.msg, "type 1 is function, type 2 is number"), 'function/int')
    nok(eq(12, "Hallo"), 'int/string')
  end, {"object/string", "function/int", 'int/string'}, {})

  --
  -- Spies
  --
  metatest('spy called', function()
    local f = spy()
    ok(not f.called or #f.called == 0, 'not called')
    f()
    ok(f.called, 'called')
    ok(#f.called == 1, 'called once')
    f()
    ok(#f.called == 2, 'called twice')
  end, {'not called', 'called', 'called once', 'called twice'}, {})

  metatest('spy with arguments', function()
    local x = 0
    local function setX(n) x = n end
    local f = spy(setX)
    f(1)
    ok(x == 1, 'x == 1')
    ok(eq(f.called, {{1}}), 'called with 1')
    f(42)
    ok(x == 42, 'x == 42')
    ok(eq(f.called, {{1}, {42}}), 'called with 42')
  end, {'x == 1', 'called with 1', 'x == 42', 'called with 42'}, {})

  metatest('spy with nils', function()
    local function nils(a, _, b) return a, nil, b, nil end
    local f = spy(nils)
    local r1, r2, r3, r4 = f(1, nil, 2)
    ok(eq(f.called, {{1, nil, 2}}), 'nil in args')
    ok(r1 == 1 and r2 == nil and r3 == 2 and r4 == nil, 'nil in returns')
  end, {'nil in args', 'nil in returns'}, {})

  metatest('spy with exception', function()
    local function throwSomething(s)
      if s ~= 'nopanic' then error('panic: '..s) end
    end
    local f = spy(throwSomething)
    f('nopanic')
    ok(f.errors == nil, 'no errors yet')
    f('foo')
    ok(eq(f.called, {{'nopanic'}, {'foo'}}), 'args ok')
    ok(f.errors[1] == nil and f.errors[2] ~= nil, 'thrown ok')
  end, {'no errors yet', 'args ok', 'thrown ok'}, {})

  metatest('another spy with exception', function()
    local f = spy(function() local a = unknownVariable + 1 end) -- luacheck: ignore
    f()
    ok(f.errors[1], 'exception thrown')
  end, {'exception thrown'}, {})

  metatest('spy should return a value', function()
    local f = spy(function() return 5 end)
    ok(f() == 5, 'spy returns a value')
    local g = spy()
    ok(g() == nil, 'default spy returns undefined')
  end, {'spy returns a value', 'default spy returns undefined'}, {})

  --
  -- fail tests
  --
  metatest('fail with correct errormessage', function()
    fail(function() error("my error") end, "my error", "Failed with correct error")
    ok(true, 'reachable code')
  end, {'Failed with correct error', 'reachable code'}, {})

  metatest('fail with incorrect errormessage', function()
    fail(function() error("my error") end, "different error", "Failed with incorrect error")
    ok(true, 'unreachable code')
  end, {}, {'Failed with incorrect error',
        'expected errormessage "NTest_NTest.lua:169: my error" to contain "different error"'})

  metatest('fail with incorrect errormessage default message', function()
    fail(function() error("my error") end, "different error")
    ok(true, 'unreachable code')
  end, {}, {'NTest_NTest.lua:175',
        'expected errormessage "NTest_NTest.lua:175: my error" to contain "different error"'})

  metatest('fail with not failing code', function()
    fail(function() end, "my error", "did not fail")
    ok(true, 'unreachable code')
  end, {}, {"did not fail", 'Expected to fail with Error containing "my error"'})

  metatest('fail with failing code', function()
    fail(function() error("my error") end, nil, "Failed as expected")
    ok(true, 'reachable code')
  end, {'Failed as expected', 'reachable code'}, {})

  metatest('fail with not failing code', function()
    fail(function() end, nil , "did not fail")
    ok(true, 'unreachable code')
  end, {}, {"did not fail", 'Expected to fail with Error'})

  metatest('fail with not failing code default message', function()
    fail(function() end)
    ok(true, 'unreachable code')
  end, {}, {"NTest_NTest.lua:196", 'Expected to fail with Error'})

  metatest('=== load more tests ===', function()
    load_tests2()
  end, {}, {})

end

load_tests2 = function()
  --
  -- except tests
  --
  metatest('error should panic', function()
    error("lua error")
    ok(true, 'unreachable code')
  end, {}, {}, {'NTest_NTest.lua:211: lua error'})

  --
  -- called function except
  --

  local function subfuncerror()
    error("lua error")
  end

  metatest('subroutine error should panic', function()
    subfuncerror()
    ok(true, 'unreachable code')
  end, {}, {}, {'NTest_NTest.lua:220: lua error'})

  local function subfuncok()
    ok(false)
  end

  metatest('subroutine ok should fail', function()
    subfuncok()
    ok(true, 'unreachable code')
  end, {}, {'NTest_NTest.lua:229'})

  --drain_post_queue()

  --
  -- Async tests
  --
  metatest('async test', function(next)
    async(function()
      ok(true, 'bar')
      async(function()
        ok(true, 'baz')
        next()
      end)
    end)
    ok(true, 'foo')
  end, {'foo', 'bar', 'baz'}, {}, {}, true)

  metatest('async test without actually async', function(next)
    ok(true, 'bar')
    next()
  end, {'bar'}, {}, {}, true)

  metatest('async fail in main', function(--[[ next ]])
    ok(false, "async fail")
    ok(true, 'unreachable code')
  end, {}, {'async fail'}, {}, true)

  --drain_post_queue()

  metatest('another async test after async queue drained', function(next)
    async(function()
      ok(true, 'bar')
      next()
    end)
    ok(true, 'foo')
  end, {'foo', 'bar'}, {}, {}, true)

  --
  -- except tests async
  --
  metatest('async except in main', function(--[[ next ]])
    error("async except")
    ok(true, 'unreachable code')
  end, {}, {}, {'NTest_NTest.lua:277: async except'}, true)

  metatest('async fail in callback', function(next)
    async(function()
      ok(false, "async fail")
      next()
    end)
    ok(true, 'foo')
  end, {'foo'}, {'async fail'}, {}, true)

  metatest('async except in callback', function(next)
    async(function()
      error("async Lua error")
      next()
    end)
    ok(true, 'foo')
  end, {'foo'}, {}, {'NTest_NTest.lua:291: async Lua error'}, true)

  --
  -- sync after async test
  --
  local marker = 0
  metatest('set marker async', function(next)
    async(function()
      marker = "marked"
      ok(true, 'async bar')
      next()
    end)
    ok(true, 'foo')
  end, {'foo', 'async bar'}, {}, {}, true)

  metatest('check marker async', function()
    ok(eq(marker, "marked"), "marker check")
  end, {"marker check"}, {})

  --
  -- coroutine async tests
  --
  metatest('coroutine pass', function(--[[ getCB, waitCB ]])
    ok(true, "passing")
  end, {"passing"}, {}, {}, "co")

  metatest('coroutine fail in main', function(--[[ getCB, waitCB ]])
    ok(false, "coroutine fail")
    ok(true, 'unreachable code')
  end, {}, {'coroutine fail'}, {}, "co")

  metatest('coroutine fail in main', function(--[[ getCB, waitCB ]])
    nok(true, "coroutine fail")
    nok(false, 'unreachable code')
  end, {}, {'coroutine fail'}, {}, "co")

  metatest('coroutine fail error', function(--[[ getCB, waitCB ]])
    fail(function() error("my error") end, "my error", "Failed with correct error")
    fail(function() error("my error") end, "other error", "Failed with other error")
    ok(true, 'unreachable code')
  end, {'Failed with correct error'}, {'Failed with other error',
        'expected errormessage "NTest_NTest.lua:333: my error" to contain "other error"'}, {}, "co")

  metatest('coroutine except in main', function(--[[ getCB, waitCB ]])
    error("coroutine except")
    ok(true, 'unreachable code')
  end, {}, {}, {'NTest_NTest.lua:339: coroutine except'}, "co")

  --local function coasync(f) table.insert(post_queue, 1, f) end
  local function coasync(f, p1, p2) node.task.post(node.task.MEDIUM_PRIORITY, function() f(p1,p2) end) end

  metatest('coroutine with callback', function(getCB, waitCB)
    coasync(getCB("testCb"))
    local name = waitCB()
    ok(eq(name, "testCb"), "cb")
  end, {"cb"}, {}, {}, "co")

  metatest('coroutine with callback with values', function(getCB, waitCB)
    coasync(getCB("testCb"), "p1", 2)
    local name, p1, p2 = waitCB()
    ok(eq(name, "testCb"), "cb")
    ok(eq(p1, "p1"), "p1")
    ok(eq(p2, 2), "p2")
  end, {"cb", "p1", "p2"}, {}, {}, "co")

  metatest('coroutine fail after callback', function(getCB, waitCB)
    coasync(getCB("testCb"))
    local name = waitCB()
    ok(eq(name, "testCb"), "cb")
    ok(false, "fail")
    ok(true, 'unreachable code')
  end, {"cb"}, {"fail"}, {}, "co")

  metatest('coroutine except after callback', function(getCB, waitCB)
    coasync(getCB("testCb"))
    local name = waitCB()
    ok(eq(name, "testCb"), "cb")
    error("error")
    ok(true, 'unreachable code')
  end, {"cb"}, {}, {"NTest_NTest.lua:372: error"}, "co")

  --- detect stray callbacks after the test has finished
  local strayCb
  local function rewrap()
    coasync(strayCb)
  end

  metatest('leave stray callback', function(getCB--[[ , waitCB ]])
    strayCb = getCB("testa")
    coasync(rewrap)
  end, {}, {}, {}, "co")

  metatest('test after stray cb', function(--[[ getCB, waitCB ]])
  end, {}, {"Found stray Callback 'testa' from test 'leave stray callback'"}, {}, "co")



  --
  -- Finalize: check test results
  --
  metatest("finishing up pending tests", function()
    for i = 1,#expected -1 do
      print("--- FAIL "..expected[i].name..' (pending)')
      failed = failed + 1
    end
    print("failed: "..failed, "passed: "..passed)
    node = orig_node -- luacheck: ignore 121 (setting read-only global variable)
  end, {}, {})

end -- load_tests()


local cbWrap = function(cb) return cb end

if not node.LFS then  -- assume we run on host, not on MCU. node is already defined by NTest if running on host
  cbWrap = function(cb)
      return function(...)
          local ok, p1,p2,p3,p4 = pcall(cb, ...)
          if not ok then
            if node.Host_Error_Func then  -- luacheck: ignore 143
              node.Host_Error_Func(p1)  -- luacheck: ignore 143
            else
              print(p1, "::::::::::::: reboot :::::::::::::")
            end
          else
            return p1,p2,p3,p4
          end
        end
    end
end

-- Helper function to print arrays
local function stringify(t)
  local s = ''
  for i=1,#(t or {}) do
    s = s .. '"' .. t[i] .. '"' .. ', '
  end
  return s:gsub('..$', '')
end

local pass
-- Set meta test handler
N.report(function(e, test, msg, errormsg)
  local function consumemsg(msg, area) -- luacheck: ignore
    if not expected[1][area][1] then
      print("--- FAIL "..expected[1].name..' ('..area..'ed): unexpected "'..
        msg..'"')
      pass = false
      return
    end

    if msg ~= expected[1][area][1] then
      print("--- FAIL "..expected[1].name..' ('..area..'ed): expected "'..
        expected[1][area][1]..'" vs "'..
        msg..'"')
      pass = false
    end
    table.remove(expected[1][area], 1)
  end

  local function consumeremainder(area)
    if #expected[1][area] > 0 then
      print("--- FAIL "..expected[1].name..' ('..area..'ed): expected ['..
        stringify(expected[1][area])..']')
      pass = false
    end
  end

  if e == 'begin' then
    pass = true
  elseif e == 'end' then
    consumeremainder("pass")
    consumeremainder("fail")
    consumeremainder("except")
    if pass then
      print("+++ Pass "..expected[1].name)
      passed = passed + 1
    else
      failed = failed + 1
    end
    table.remove(expected, 1)
  elseif e == 'pass' then
    consumemsg(msg, "pass")
    if errormsg then consumemsg(errormsg, "pass") end
  elseif e == 'fail' then
    consumemsg(msg, "fail")
    if errormsg then consumemsg(errormsg, "fail") end
  elseif e == 'except' then
    consumemsg(msg, "except")
    if errormsg then consumemsg(errormsg, "except") end
  elseif e == 'start' or e == 'finish' then -- luacheck: ignore
    -- ignore
  else
    print("Extra output: ", e, test, msg, errormsg)
  end
end)

local async_queue = {}
async = function(f) table.insert(async_queue, cbWrap(f)) end
local function async_next()
  local f = table.remove(async_queue, 1)
  if f then
    f()
  end
end

local function drain_async_queue()
  while #async_queue > 0 do
    async_next()
  end
end

metatest = function(name, f, expectedPassed, expectedFailed, expectedExcept, asyncMode)
  table.insert(expected, {
    name = name,
    pass = expectedPassed,
    fail = expectedFailed,
    except = expectedExcept or {}
  })
  local ff = f
  if asyncMode then
    ff = function(...)
      f(...)
      drain_async_queue()
    end
    if (asyncMode == "co") then
      N.testco(name,ff)
    else
      N.testasync(name, ff)
    end
  else
    N.test(name, ff)
  end
end


load_tests()