import to_lua from require "yue"

compile_and_run = (code, config = {}) ->
	lua_code, err = to_lua code, config
	assert.is_nil err
	assert.is_not_nil lua_code
	chunk, load_err = load lua_code
	assert.is_nil load_err
	assert.is_not_nil chunk
	chunk!

describe "annotation", ->
	it "should append generated text after annotated class by default", ->
		code = [[
macro ClsDef = (code`ClassDecl) ->
	className = code\match "^class%s+(%w+)"
	return
		type: "text"
		before: false
		code: "-- after:" .. className

$[ClsDef]
class A
	getName: => "A"

return
]]
		result, err = to_lua code
		assert.is_nil err
		assert.is_not_nil result
		assert.is_true result\find("__name = \"A\"") != nil
		assert.is_true result\find("%-%- after:A") != nil
		assert.is_true result\find("__name = \"A\"") < result\find("%-%- after:A")

	it "should place generated text before the annotated statement when before is true", ->
		code = [[
macro Before = (code`ClassDecl) ->
	className = code\match "^class%s+(%w+)"
	return
		type: "text"
		before: true
		code: "-- before:" .. className

$[Before]
class B
	getName: => "B"

return
]]
		result, err = to_lua code
		assert.is_nil err
		assert.is_not_nil result
		assert.is_true result\find("%-%- before:B") != nil
		assert.is_true result\find("local B") != nil
		assert.is_true result\find("%-%- before:B") < result\find("local B")

	it "should support annotation invocation arguments", ->
		code = [[
macro Tag = (tag, code`ClassDecl) ->
	className = code\match "^class%s+(%w+)"
	return
		type: "text"
		before: false
		code: "-- " .. tag .. ":" .. className

$[Tag("entity")]
class C
	getName: => "C"

return
]]
		result, err = to_lua code
		assert.is_nil err
		assert.is_not_nil result
		assert.is_true result\find("%-%- \"entity\":C") != nil

	it "should report an error when annotation is not followed by a statement", ->
		code = [[
macro Invalid = (code) -> ""
$[Invalid]
]]
		result, err = to_lua code
		assert.is_nil result
		assert.is_true err\match("annotation must be followed by a statement") != nil

	it "should wrap annotated function to validate numeric arguments", ->
		code = [[
macro ValidateNumberArgs = (code) ->
	funcName = code\match "^(%w+)%s*="
	return
		type: "text"
		before: false
		code: table.concat {
			"local __orig_#{funcName} = #{funcName}"
			"#{funcName} = function(a, b)"
			"\tassert(type(a) == \"number\", \"expected number for a\")"
			"\tassert(type(b) == \"number\", \"expected number for b\")"
			"\treturn __orig_#{funcName}(a, b)"
			"end"
		}, "\n"

$[ValidateNumberArgs]
add = (a, b) -> a + b

ok, value = pcall -> add 3, 4
bad_ok, bad_err = pcall -> add "3", 4
return ok, value, bad_ok, bad_err
]]
		ok, value, bad_ok, bad_err = compile_and_run code
		assert.is_true ok
		assert.same value, 7
		assert.is_false bad_ok
		assert.is_true bad_err\match("expected number for a") != nil

	it "should wrap annotated function to validate return value", ->
		code = [[
macro ValidateNumberReturn = (code) ->
	funcName = code\match "^(%w+)%s*="
	return
		type: "text"
		before: false
		code: table.concat {
			"local __orig_#{funcName} = #{funcName}"
			"#{funcName} = function(...)"
			"\tlocal result = __orig_#{funcName}(...)"
			"\tassert(type(result) == \"number\", \"expected numeric return\")"
			"\treturn result"
			"end"
		}, "\n"

$[ValidateNumberReturn]
toText = (value) -> tostring value

ok, err = pcall -> toText 42
return ok, err
]]
		ok, err = compile_and_run code
		assert.is_false ok
		assert.is_true err\match("expected numeric return") != nil

	it "should use annotation arguments to register annotated classes", ->
		code = [[
macro Register = (registry, code`ClassDecl) ->
	className = code\match "^class%s+(%w+)"
	return
		type: "text"
		before: false
		code: "#{registry}[\"#{className}\"] = #{className}"

registry = {}

$[Register(registry)]
class Worker
	run: => "ok"

return registry.Worker != nil, registry.Worker!\run!
]]
		exists, result = compile_and_run code
		assert.is_true exists
		assert.same result, "ok"