--[[--------------------------------------------------------------------------

  Copyright (c) 2009-2021, Google LLC
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
      * Neither the name of Google LLC nor the
        names of its contributors may be used to endorse or promote products
        derived from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

--]]--------------------------------------------------------------------------

local upb = require "lupb"
local lunit = require "lunit"
local upb_test = require "tests.bindings.lua.test_pb"
local test_messages_proto3 = require "google.protobuf.test_messages_proto3_pb"
local test_messages_proto2 = require "google.protobuf.test_messages_proto2_pb"
local descriptor = require "google.protobuf.descriptor_pb"
local empty = require "google.protobuf.empty_pb"

if _VERSION >= 'Lua 5.2' then
  _ENV = lunit.module("testupb", "seeall")
else
  module("testupb", lunit.testcase, package.seeall)
end

function iter_to_array(iter)
  local arr = {}
  for v in iter do
    arr[#arr + 1] = v
  end
  return arr
end

function test_def_readers()
  local m = test_messages_proto3.TestAllTypesProto3
  assert_equal("TestAllTypesProto3", m:name())
  assert_equal("protobuf_test_messages.proto3.TestAllTypesProto3", m:full_name())

  -- field
  local f = m:field("optional_int32")
  local f2 = m:field(1)
  assert_equal(f, f2)
  assert_equal(1, f:number())
  assert_equal("optional_int32", f:name())
  assert_equal(upb.LABEL_OPTIONAL, f:label())
  assert_equal(upb.DESCRIPTOR_TYPE_INT32, f:descriptor_type())
  assert_equal(upb.TYPE_INT32, f:type())
  assert_nil(f:containing_oneof())
  assert_equal(m, f:containing_type())
  assert_equal(0, f:default())
  local message_field_count = 0
  for field in m:fields() do
    message_field_count = message_field_count + 1
  end
  assert_equal(message_field_count, #m)

  local message_oneof_count = 0
  for oneof in m:oneofs() do
    message_oneof_count = message_oneof_count + 1
  end
  assert_equal(message_oneof_count, m:oneof_count())

  -- oneof
  local o = m:lookup_name("oneof_field")
  assert_equal("oneof_field", o:name())
  assert_equal(m, o:containing_type())
  local oneof_field_count = 0
  for field in o:fields() do
    oneof_field_count = oneof_field_count + 1
  end
  assert_equal(oneof_field_count, #o)

  -- enum
  local e = test_messages_proto3['TestAllTypesProto3.NestedEnum']
  assert_true(#e > 3 and #e < 10)
  assert_equal(2, e:value("BAZ"):number())
end

function test_msg_map()
  msg = test_messages_proto3.TestAllTypesProto3()
  msg.map_int32_int32[5] = 10
  msg.map_int32_int32[6] = 12
  assert_equal(10, msg.map_int32_int32[5])
  assert_equal(12, msg.map_int32_int32[6])

  -- Test overwrite.
  msg.map_int32_int32[5] = 20
  assert_equal(20, msg.map_int32_int32[5])
  assert_equal(12, msg.map_int32_int32[6])
  msg.map_int32_int32[5] = 10

  -- Test delete.
  msg.map_int32_int32[5] = nil
  assert_nil(msg.map_int32_int32[5])
  assert_equal(12, msg.map_int32_int32[6])
  msg.map_int32_int32[5] = 10

  local serialized = upb.encode(msg)
  assert_true(#serialized > 0)
  local msg2 = upb.decode(test_messages_proto3.TestAllTypesProto3, serialized)
  assert_equal(10, msg2.map_int32_int32[5])
  assert_equal(12, msg2.map_int32_int32[6])
end

function test_map_sorting()
  function msg_with_int32_entries(start, expand)
    local msg = test_messages_proto3.TestAllTypesProto3()
    for i=start,start + 8 do
      msg.map_int32_int32[i] = i * 2
    end

    if expand then
      for i=start+20,200 do
        msg.map_int32_int32[i] = i
      end
      for i=start+20,200 do
        msg.map_int32_int32[i] = nil
      end
    end
    return msg
  end

  function msg_with_msg_entries(expand)
    local msg = test_messages_proto3.TestAllTypesProto3()
    -- 8! = 40320 possible orderings makes it overwhelmingly likely that two
    -- random orderings will be different.
    for i=1,8 do
      local submsg = test_messages_proto3.TestAllTypesProto3.NestedMessage()
      submsg.corecursive = msg_with_int32_entries(i, expand)
      msg.map_string_nested_message[tostring(i)] = submsg
    end

    expand = false
    if expand then
      for i=21,2000 do
        local submsg = test_messages_proto3.TestAllTypesProto3.NestedMessage()
        submsg.corecursive = msg_with_int32_entries(i, expand)
        msg.map_string_nested_message[tostring(i)] = submsg
      end
      for i=21,2000 do
        msg.map_string_nested_message[tostring(i)] = nil
      end
    end
    return msg
  end

  -- Create two messages with the same contents but (hopefully) different
  -- map table orderings.
  local msg = msg_with_msg_entries(false)
  local msg2 = msg_with_msg_entries(true)

  local text1 = upb.text_encode(msg)
  local text2 = upb.text_encode(msg2)
  assert_equal(text1, text2)

  local binary1 = upb.encode(msg, {upb.ENCODE_DETERMINISTIC})
  local binary2 = upb.encode(msg2, {upb.ENCODE_DETERMINISTIC})
  assert_equal(binary1, binary2)

  -- Non-sorted map should compare different.
  local text3 = upb.text_encode(msg, {upb.TXTENC_NOSORT})
  assert_not_equal(text1, text3)

  local binary3 = upb.encode(msg)
  assert_not_equal(binary1, binary3)
end

function test_utf8()
  local proto2_msg = test_messages_proto2.TestAllTypesProto2()
  proto2_msg.optional_string = "\xff"
  local serialized = upb.encode(proto2_msg)

  -- Decoding invalid UTF-8 succeeds in proto2.
  upb.decode(test_messages_proto2.TestAllTypesProto2, serialized)

  -- Decoding invalid UTF-8 fails in proto2.
  assert_error_match("Error decoding protobuf", function()
    upb.decode(test_messages_proto3.TestAllTypesProto3, serialized)
  end)

  -- TODO(haberman): should proto3 accessors also check UTF-8 at set time?
end

function test_string_double_map()
  msg = upb_test.MapTest()
  msg.map_string_double["one"] = 1.0
  msg.map_string_double["two point five"] = 2.5
  assert_equal(1, msg.map_string_double["one"])
  assert_equal(2.5, msg.map_string_double["two point five"])

  -- Test overwrite.
  msg.map_string_double["one"] = 2
  assert_equal(2, msg.map_string_double["one"])
  assert_equal(2.5, msg.map_string_double["two point five"])
  msg.map_string_double["one"] = 1.0

  -- Test delete.
  msg.map_string_double["one"] = nil
  assert_nil(msg.map_string_double["one"])
  assert_equal(2.5, msg.map_string_double["two point five"])
  msg.map_string_double["one"] = 1

  local serialized = upb.encode(msg)
  assert_true(#serialized > 0)
  local msg2 = upb.decode(upb_test.MapTest, serialized)
  assert_equal(1, msg2.map_string_double["one"])
  assert_equal(2.5, msg2.map_string_double["two point five"])
end

function test_string_double_map()
  local function fill_msg(msg)
    msg.i32_packed[1] = 100
    msg.i32_packed[2] = 200
    msg.i32_packed[3] = 50000

    msg.i64_packed[1] = 101
    msg.i64_packed[2] = 201
    msg.i64_packed[3] = 50001

    msg.f32_packed[1] = 102
    msg.f32_packed[2] = 202
    msg.f32_packed[3] = 50002

    msg.f64_packed[1] = 103
    msg.f64_packed[2] = 203
    msg.f64_packed[3] = 50003
  end

  local function check_msg(msg)
    assert_equal(100, msg.i32_packed[1])
    assert_equal(200, msg.i32_packed[2])
    assert_equal(50000, msg.i32_packed[3])
    assert_equal(3, #msg.i32_packed)

    assert_equal(101, msg.i64_packed[1])
    assert_equal(201, msg.i64_packed[2])
    assert_equal(50001, msg.i64_packed[3])
    assert_equal(3, #msg.i64_packed)

    assert_equal(102, msg.f32_packed[1])
    assert_equal(202, msg.f32_packed[2])
    assert_equal(50002, msg.f32_packed[3])
    assert_equal(3, #msg.f32_packed)

    assert_equal(103, msg.f64_packed[1])
    assert_equal(203, msg.f64_packed[2])
    assert_equal(50003, msg.f64_packed[3])
    assert_equal(3, #msg.f64_packed)
  end

  local msg = upb_test.PackedTest()
  fill_msg(msg)
  check_msg(msg)

  local serialized_packed = upb.encode(msg)
  local msg2 = upb.decode(upb_test.PackedTest, serialized_packed)
  local msg3 = upb.decode(upb_test.UnpackedTest, serialized_packed)
  check_msg(msg2)
  check_msg(msg3)

  serialized_unpacked = upb.encode(msg3)
  local msg4 = upb.decode(upb_test.PackedTest, serialized_unpacked)
  local msg5 = upb.decode(upb_test.PackedTest, serialized_unpacked)
  check_msg(msg4)
  check_msg(msg5)

end

function test_msg_string_map()
  msg = test_messages_proto3.TestAllTypesProto3()
  msg.map_string_string["foo"] = "bar"
  msg.map_string_string["baz"] = "quux"
  assert_nil(msg.map_string_string["abc"])
  assert_equal("bar", msg.map_string_string["foo"])
  assert_equal("quux", msg.map_string_string["baz"])

  -- Test overwrite.
  msg.map_string_string["foo"] = "123"
  assert_equal("123", msg.map_string_string["foo"])
  assert_equal("quux", msg.map_string_string["baz"])
  msg.map_string_string["foo"] = "bar"

  -- Test delete
  msg.map_string_string["foo"] = nil
  assert_nil(msg.map_string_string["foo"])
  assert_equal("quux", msg.map_string_string["baz"])
  msg.map_string_string["foo"] = "bar"

  local serialized = upb.encode(msg)
  assert_true(#serialized > 0)
  local msg2 = upb.decode(test_messages_proto3.TestAllTypesProto3, serialized)
  assert_equal("bar", msg2.map_string_string["foo"])
  assert_equal("quux", msg2.map_string_string["baz"])
end

function test_msg_array()
  msg = test_messages_proto3.TestAllTypesProto3()

  assert_not_nil(msg.repeated_int32)
  assert_equal(msg.repeated_int32, msg.repeated_int32)
  assert_equal(0, #msg.repeated_int32)

  msg.repeated_int32[1] = 2
  assert_equal(1, #msg.repeated_int32);
  assert_equal(2, msg.repeated_int32[1]);

  -- Can't assign a scalar; array is expected.
  assert_error_match("lupb.array expected", function() msg.repeated_int32 = 5 end)

  -- Can't assign array of the wrong type.
  local function assign_int64()
    msg.repeated_int32 = upb.Array(upb.TYPE_INT64)
  end
  assert_error_match("array type mismatch", assign_int64)

  local arr = upb.Array(upb.TYPE_INT32)
  arr[1] = 6
  assert_equal(1, #arr)
  msg.repeated_int32 = arr
  assert_equal(msg.repeated_int32, msg.repeated_int32)
  assert_equal(arr, msg.repeated_int32)
  assert_equal(1, #msg.repeated_int32)
  assert_equal(6, msg.repeated_int32[1])

  -- Can't assign other Lua types.
  assert_error_match("array expected", function() msg.repeated_int32 = "abc" end)
  assert_error_match("array expected", function() msg.repeated_int32 = true end)
  assert_error_match("array expected", function() msg.repeated_int32 = false end)
  assert_error_match("array expected", function() msg.repeated_int32 = nil end)
  assert_error_match("array expected", function() msg.repeated_int32 = {} end)
  assert_error_match("array expected", function() msg.repeated_int32 = print end)
end

function test_array_append()
  local arr = upb.Array(upb.TYPE_INT32)
  for i=1,200000 do
    arr[i] = i
  end
  for i=1,200000 do
    assert_equal(i, arr[i])
  end
end

function test_msg_submsg()
  --msg = test_messages_proto3.TestAllTypesProto3()
  msg = test_messages_proto3['TestAllTypesProto3']()

  assert_nil(msg.optional_nested_message)

  -- Can't assign message of the wrong type.
  local function assign_int64()
    msg.optional_nested_message = test_messages_proto3.TestAllTypesProto3()
  end
  assert_error_match("message type mismatch", assign_int64)

  local nested = test_messages_proto3['TestAllTypesProto3.NestedMessage']()
  msg.optional_nested_message = nested
  assert_equal(nested, msg.optional_nested_message)

  -- Can't assign other Lua types.
  assert_error_match("msg expected", function() msg.optional_nested_message = "abc" end)
  assert_error_match("msg expected", function() msg.optional_nested_message = true end)
  assert_error_match("msg expected", function() msg.optional_nested_message = false end)
  assert_error_match("msg expected", function() msg.optional_nested_message = nil end)
  assert_error_match("msg expected", function() msg.optional_nested_message = {} end)
  assert_error_match("msg expected", function() msg.optional_nested_message = print end)
end

-- Lua 5.1 and 5.2 have slightly different semantics for how a finalizer
-- can be defined in Lua.
if _VERSION >= 'Lua 5.2' then
  function defer(fn)
    setmetatable({}, { __gc = fn })
  end
else
  function defer(fn)
    getmetatable(newproxy(true)).__gc = fn
  end
end

function test_finalizer()
  -- Tests that we correctly handle a call into an already-finalized object.
  -- Collectible objects are finalized in the opposite order of creation.
  do
    local t = {}
    defer(function()
      assert_error_match("called into dead object", function()
        -- Generic def call.
        t[1]:lookup_msg("abc")
      end)
    end)
    t = {
      upb.SymbolTable(),
    }
  end
  collectgarbage()
end

-- in-range of 64-bit types but not exactly representable as double
local bad64 = 2^68 - 1

local numeric_types = {
  [upb.TYPE_UINT32] = {
    valid_val = 2^32 - 1,
    too_big = 2^32,
    too_small = -1,
    other_bad = 5.1
  },
  [upb.TYPE_UINT64] = {
    valid_val = 2^63,
    too_big = 2^64,
    too_small = -1,
    other_bad = bad64
  },
  [upb.TYPE_INT32] = {
    valid_val = 2^31 - 1,
    too_big = 2^31,
    too_small = -2^31 - 1,
    other_bad = 5.1
  },
  -- Enums don't exist at a language level in Lua, so we just represent enum
  -- values as int32s.
  [upb.TYPE_ENUM] = {
    valid_val = 2^31 - 1,
    too_big = 2^31,
    too_small = -2^31 - 1,
    other_bad = 5.1
  },
  [upb.TYPE_INT64] = {
    valid_val = 2^62,
    too_big = 2^63,
    too_small = -2^64,
    other_bad = bad64
  },
  [upb.TYPE_FLOAT] = {
    valid_val = 340282306073709652508363335590014353408
  },
  [upb.TYPE_DOUBLE] = {
    valid_val = 10^101
  },
}

function test_utf8()
  local invalid_utf8 = "\xff"
  local proto2_msg = test_messages_proto2.TestAllTypesProto2{
    optional_string = invalid_utf8,
  }

  -- As proto2, invalid UTF-8 parses and serializes fine.
  local serialized = upb.encode(proto2_msg)
  local proto2_msg2 = upb.decode(test_messages_proto2.TestAllTypesProto2, serialized)

  -- Decoding as proto3 fails.
  assert_error(function()
    upb.decode(test_messages_proto3.TestAllTypesProto3, serialized)
  end)
end

function test_msg_primitives()
  local msg = test_messages_proto3.TestAllTypesProto3{
    optional_int32 = 10,
    optional_uint32 = 20,
    optional_int64 = 30,
    optional_uint64 = 40,
    optional_double = 50,
    optional_float = 60,
    optional_sint32 = 70,
    optional_sint64 = 80,
    optional_fixed32 = 90,
    optional_fixed64 = 100,
    optional_sfixed32 = 110,
    optional_sfixed64 = 120,
    optional_bool = true,
    optional_string = "abc",
    optional_nested_message = test_messages_proto3['TestAllTypesProto3.NestedMessage']{a = 123},
  }

  -- Attempts to access non-existent fields fail.
  assert_error_match("no such field", function() msg.no_such = 1 end)

  assert_equal(10, msg.optional_int32)
  assert_equal(20, msg.optional_uint32)
  assert_equal(30, msg.optional_int64)
  assert_equal(40, msg.optional_uint64)
  assert_equal(50, msg.optional_double)
  assert_equal(60, msg.optional_float)
  assert_equal(70, msg.optional_sint32)
  assert_equal(80, msg.optional_sint64)
  assert_equal(90, msg.optional_fixed32)
  assert_equal(100, msg.optional_fixed64)
  assert_equal(110, msg.optional_sfixed32)
  assert_equal(120, msg.optional_sfixed64)
  assert_equal(true, msg.optional_bool)
  assert_equal("abc", msg.optional_string)
  assert_equal(123, msg.optional_nested_message.a)
end


function test_string_array()
  local function test_for_string_type(upb_type)
    local array = upb.Array(upb_type)
    assert_equal(0, #array)

    -- 0 is never a valid index in Lua.
    assert_error_match("array index", function() return array[0] end)
    -- Past the end of the array.
    assert_error_match("array index", function() return array[1] end)

    array[1] = "foo"
    assert_equal("foo", array[1])
    assert_equal(1, #array)
    -- Past the end of the array.
    assert_error_match("array index", function() return array[2] end)

    local array2 = upb.Array(upb_type)
    assert_equal(0, #array2)

    array[2] = "bar"
    assert_equal("foo", array[1])
    assert_equal("bar", array[2])
    assert_equal(2, #array)
    -- Past the end of the array.
    assert_error_match("array index", function() return array[3] end)

    -- Can't assign other Lua types.
    assert_error_match("Expected string", function() array[3] = 123 end)
    assert_error_match("Expected string", function() array[3] = true end)
    assert_error_match("Expected string", function() array[3] = false end)
    assert_error_match("Expected string", function() array[3] = nil end)
    assert_error_match("Expected string", function() array[3] = {} end)
    assert_error_match("Expected string", function() array[3] = print end)
    assert_error_match("Expected string", function() array[3] = array end)
  end

  test_for_string_type(upb.TYPE_STRING)
  test_for_string_type(upb.TYPE_BYTES)
end

function test_numeric_array()
  local function test_for_numeric_type(upb_type)
    local array = upb.Array(upb_type)
    local vals = numeric_types[upb_type]
    assert_equal(0, #array)

    -- 0 is never a valid index in Lua.
    assert_error_match("array index", function() return array[0] end)
    -- Past the end of the array.
    assert_error_match("array index", function() return array[1] end)

    array[1] = vals.valid_val
    assert_equal(vals.valid_val, array[1])
    assert_equal(1, #array)
    assert_equal(vals.valid_val, array[1])
    -- Past the end of the array.
    assert_error_match("array index", function() return array[2] end)

    array[2] = 10
    assert_equal(vals.valid_val, array[1])
    assert_equal(10, array[2])
    assert_equal(2, #array)
    -- Past the end of the array.
    assert_error_match("array index", function() return array[3] end)

    -- Values that are out of range.
    local errmsg = "not an integer or out of range"
    if vals.too_small then
      assert_error_match(errmsg, function() array[3] = vals.too_small end)
    end
    if vals.too_big then
      assert_error_match(errmsg, function() array[3] = vals.too_big end)
    end
    if vals.other_bad then
      assert_error_match(errmsg, function() array[3] = vals.other_bad end)
    end

    -- Can't assign other Lua types.
    errmsg = "bad argument #3"
    assert_error_match(errmsg, function() array[3] = "abc" end)
    assert_error_match(errmsg, function() array[3] = true end)
    assert_error_match(errmsg, function() array[3] = false end)
    assert_error_match(errmsg, function() array[3] = nil end)
    assert_error_match(errmsg, function() array[3] = {} end)
    assert_error_match(errmsg, function() array[3] = print end)
    assert_error_match(errmsg, function() array[3] = array end)
  end

  for k in pairs(numeric_types) do
    test_for_numeric_type(k)
  end
end

function test_numeric_map()
  local function test_for_numeric_types(key_type, val_type)
    local map = upb.Map(key_type, val_type)
    local key_vals = numeric_types[key_type]
    local val_vals = numeric_types[val_type]

    assert_equal(0, #map)

    -- Unset keys return nil
    assert_nil(map[key_vals.valid_val])

    map[key_vals.valid_val] = val_vals.valid_val
    assert_equal(1, #map)
    assert_equal(val_vals.valid_val, map[key_vals.valid_val])

    i = 0
    for k, v in pairs(map) do
      assert_equal(key_vals.valid_val, k)
      assert_equal(val_vals.valid_val, v)
    end

    -- Out of range key/val
    local errmsg = "not an integer or out of range"
    if key_vals.too_small then
      assert_error_match(errmsg, function() map[key_vals.too_small] = 1 end)
    end
    if key_vals.too_big then
      assert_error_match(errmsg, function() map[key_vals.too_big] = 1 end)
    end
    if key_vals.other_bad then
      assert_error_match(errmsg, function() map[key_vals.other_bad] = 1 end)
    end

    if val_vals.too_small then
      assert_error_match(errmsg, function() map[1] = val_vals.too_small end)
    end
    if val_vals.too_big then
      assert_error_match(errmsg, function() map[1] = val_vals.too_big end)
    end
    if val_vals.other_bad then
      assert_error_match(errmsg, function() map[1] = val_vals.other_bad end)
    end
  end

  for k in pairs(numeric_types) do
    for v in pairs(numeric_types) do
      test_for_numeric_types(k, v)
    end
  end
end

function test_unknown()
  local bytes = string.rep("\x38\x00", 1000)
  for i=1,1000 do
    local msg = upb.decode(test_messages_proto3.TestAllTypesProto3, bytes)
  end
end

function test_foo()
  local symtab = upb.SymbolTable()
  local filename = "external/com_google_protobuf/descriptor_proto-descriptor-set.proto.bin"
  local file = io.open(filename, "rb") or io.open("bazel-bin/" .. filename, "rb")
  assert_not_nil(file)
  local descriptor = file:read("*a")
  assert_true(#descriptor > 0)
  symtab:add_set(descriptor)
  local FileDescriptorSet = symtab:lookup_msg("google.protobuf.FileDescriptorSet")
  assert_not_nil(FileDescriptorSet)
  set = FileDescriptorSet()
  assert_equal(#set.file, 0)
  assert_error_match("lupb.array expected", function () set.file = 1 end)

  set = upb.decode(FileDescriptorSet, descriptor)

  -- Test that we can at least call this without crashing.
  set_textformat = tostring(set)

  -- print(set_textformat)
  assert_equal(#set.file, 1)
  assert_equal(set.file[1].name, "google/protobuf/descriptor.proto")
end

function test_descriptor()
  local symtab = upb.SymbolTable()
  local file_proto = descriptor.FileDescriptorProto {
    name = "test.proto",
    message_type = upb.Array(descriptor.DescriptorProto, {
      descriptor.DescriptorProto{
        name = "ABC",
      },
    })
  }
  local file = symtab:add_file(upb.encode(file_proto))
  assert_equal(file:symtab(), symtab)
end

function test_descriptor_error()
  local symtab = upb.SymbolTable()
  local file = descriptor.FileDescriptorProto()
  file.name = "test.proto"
  file.message_type[1] = descriptor.DescriptorProto{
    name = "ABC"
  }
  file.message_type[2] = descriptor.DescriptorProto{
    name = "BC."
  }
  assert_error(function () symtab:add_file(upb.encode(file)) end)
  assert_nil(symtab:lookup_msg("ABC"))
end

function test_duplicate_enumval()
  local symtab = upb.SymbolTable()
  local file_proto = descriptor.FileDescriptorProto {
    name = "test.proto",
    message_type = upb.Array(descriptor.DescriptorProto, {
      descriptor.DescriptorProto{
        name = "ABC",
      },
    }),
    enum_type = upb.Array(descriptor.EnumDescriptorProto, {
      descriptor.EnumDescriptorProto{
        name = "MyEnum",
        value = upb.Array(descriptor.EnumValueDescriptorProto, {
          descriptor.EnumValueDescriptorProto{
            name = "ABC",
            number = 1,
          }
        }),
      },
    })
  }
  assert_error(function () symtab:add_file(upb.encode(file_proto)) end)
end

function test_duplicate_filename_error()
  local symtab = upb.SymbolTable()
  local file = descriptor.FileDescriptorProto()
  file.name = "test.proto"
  symtab:add_file(upb.encode(file))
  -- Second add with the same filename fails.
  assert_error(function () symtab:add_file(upb.encode(file)) end)
end

function test_encode_skipunknown()
  -- Test that upb.ENCODE_SKIPUNKNOWN does not encode unknown fields.
  local msg = test_messages_proto3.TestAllTypesProto3{
    optional_int32 = 10,
    optional_uint32 = 20,
    optional_int64 = 30,
  }
  -- SKIPUNKNOWN here tests that it does *not* affect regular fields.
  local serialized = upb.encode(msg, {upb.ENCODE_SKIPUNKNOWN})
  assert_true(#serialized > 0)
  local empty_with_unknown = upb.decode(empty.Empty, serialized)
  assert_true(#upb.encode(empty_with_unknown) > 0)
  -- Verify that unknown fields are not serialized.
  assert_true(#upb.encode(empty_with_unknown, {upb.ENCODE_SKIPUNKNOWN}) == 0)
end

function test_json_emit_defaults()
  local msg = test_messages_proto3.TestAllTypesProto3()
  local json = upb.json_encode(msg, {upb.JSONENC_EMITDEFAULTS})
end

function test_json_locale()
  local msg = test_messages_proto3.TestAllTypesProto3()
  msg.optional_double = 1.1
  local original_locale = os.setlocale(nil)
  os.setlocale("C")
  local json = upb.json_encode(msg)
  os.setlocale("de_DE.utf8")
  assert_equal(json, upb.json_encode(msg))
  os.setlocale(original_locale)  -- Restore.
end

function test_encode_depth_limit()
  local msg = test_messages_proto3.TestAllTypesProto3()
  msg.recursive_message = msg
  assert_error(function() upb.encode(msg) end)
end

function test_large_field_number()
  local msg = upb_test.TestLargeFieldNumber()
  msg.i32 = 5
  local serialized = upb.encode(msg)
  local msg2 = upb.decode(upb_test.TestLargeFieldNumber, serialized)
  assert_equal(msg.i32, msg2.i32)
end

function test_timestamp_minutes()
  local msg = upb.json_decode(upb_test.TestTimestamp, '{"ts": "2000-01-01T00:00:00-06:59"}')
  assert_equal(msg.ts.seconds, 946684800 + ((6 * 60) + 59) * 60)
end

function test_gc()
  local top = test_messages_proto3.TestAllTypesProto3()
  local n = 100
  local m

  for i=1,n do
    local inner = test_messages_proto3.TestAllTypesProto3()
    m = inner
    for j=1,n do
      local tmp = m
      m = test_messages_proto3.TestAllTypesProto3()
      -- This will cause the arenas to fuse. But we stop referring to the child,
      -- so the Lua object is eligible for collection (and therefore its original
      -- arena can be collected too). Only the fusing will keep the C mem alivd.
      m.recursive_message = tmp

    end
    top.recursive_message = m
  end

  collectgarbage()

  for i=1,n do
    -- Verify we can touch all the messages again and without accessing freed
    -- memory.
    m = m.recursive_message
    assert_not_nil(m)
  end
end

function test_b9440()
  local m = upb_test.HelloRequest()
  m.id = 8
  assert_equal(8, m.id)
  m.version = "1"
  assert_equal(8, m.id)
end

local stats = lunit.main()

if stats.failed > 0 or stats.errors > 0 then
  error("One or more errors in test suite")
end