v/vlib/x/json2/json2_test.v

import x.json2

enum JobTitle {
	manager
	executive
	worker
}

struct Employee {
pub mut:
	name   string
	age    int
	salary f32
	title  JobTitle
}

fn (e Employee) to_json() string {
	mut mp := map[string]json2.Any{}
	mp['name'] = e.name
	mp['age'] = e.age
	mp['salary'] = e.salary
	mp['title'] = int(e.title)
	/*
	$for field in Employee.fields {
		d := e.$(field.name)

		$if field.typ is JobTitle {
			mp[field.name] = json.encode<int>(d)
		} $else {
			mp[field.name] = d
		}
	}
	*/
	return mp.str()
}

fn (mut e Employee) from_json(any json2.Any) {
	mp := any.as_map()
	e.name = mp['name'].str()
	e.age = mp['age'].int()
	e.salary = mp['salary'].f32()
	e.title = JobTitle(mp['title'].int())
}

fn test_simple() {
	x := Employee{'Peter', 28, 95000.5, .worker}
	s := json2.encode<Employee>(x)
	eprintln('Employee x: $s')
	assert s == '{"name":"Peter","age":28,"salary":95000.5,"title":2}'
	y := json2.decode<Employee>(s) or {
		println(err)
		assert false
		return
	}
	eprintln('Employee y: $y')
	assert y.name == 'Peter'
	assert y.age == 28
	assert y.salary == 95000.5
	assert y.title == .worker
}

fn test_fast_raw_decode() {
	s := '{"name":"Peter","age":28,"salary":95000.5,"title":2}'
	o := json2.fast_raw_decode(s) or {
		assert false
		json2.Any(json2.null)
	}
	str := o.str()
	assert str == '{"name":"Peter","age":"28","salary":"95000.5","title":"2"}'
}

fn test_character_unescape() {
	message := r'{
	"newline": "new\nline",
	"tab": "\ttab",
	"backslash": "back\\slash",
	"quotes": "\"quotes\"",
	"slash":"\/dev\/null"
}'
	mut obj := json2.raw_decode(message) or {
		println(err)
		assert false
		return
	}
	lines := obj.as_map()
	eprintln('$lines')
	assert lines['newline'].str() == 'new\nline'
	assert lines['tab'].str() == '\ttab'
	assert lines['backslash'].str() == 'back\\slash'
	assert lines['quotes'].str() == '"quotes"'
	assert lines['slash'].str() == '/dev/null'
}

struct User2 {
pub mut:
	age  int
	nums []int
}

fn (mut u User2) from_json(an json2.Any) {
	mp := an.as_map()
	mut js_field_name := ''
	$for field in User.fields {
		js_field_name = field.name
		for attr in field.attrs {
			if attr.starts_with('json:') {
				js_field_name = attr.all_after('json:').trim_left(' ')
				break
			}
		}
		match field.name {
			'age' { u.age = mp[js_field_name].int() }
			'nums' { u.nums = mp[js_field_name].arr().map(it.int()) }
			else {}
		}
	}
}

// User struct needs to be `pub mut` for now in order to access and manipulate values
struct User {
pub mut:
	age           int
	nums          []int
	last_name     string [json: lastName]
	is_registered bool   [json: IsRegistered]
	typ           int    [json: 'type']
	pets          string [json: 'pet_animals'; raw]
}

fn (mut u User) from_json(an json2.Any) {
	mp := an.as_map()
	mut js_field_name := ''
	$for field in User.fields {
		// FIXME: C error when initializing js_field_name inside comptime for
		js_field_name = field.name
		for attr in field.attrs {
			if attr.starts_with('json:') {
				js_field_name = attr.all_after('json:').trim_left(' ')
				break
			}
		}
		match field.name {
			'age' { u.age = mp[js_field_name].int() }
			'nums' { u.nums = mp[js_field_name].arr().map(it.int()) }
			'last_name' { u.last_name = mp[js_field_name].str() }
			'is_registered' { u.is_registered = mp[js_field_name].bool() }
			'typ' { u.typ = mp[js_field_name].int() }
			'pets' { u.pets = mp[js_field_name].str() }
			else {}
		}
	}
}

fn (u User) to_json() string {
	// TODO: derive from field
	mut mp := {
		'age': json2.Any(u.age)
	}
	mp['nums'] = u.nums.map(json2.Any(it))
	mp['lastName'] = u.last_name
	mp['IsRegistered'] = u.is_registered
	mp['type'] = u.typ
	mp['pet_animals'] = u.pets
	return mp.str()
}

fn test_parse_user() {
	s := '{"age": 10, "nums": [1,2,3], "type": 1, "lastName": "Johnson", "IsRegistered": true, "pet_animals": {"name": "Bob", "animal": "Dog"}}'
	u2 := json2.decode<User2>(s) or {
		println(err)
		assert false
		return
	}
	println(u2)
	u := json2.decode<User>(s) or {
		println(err)
		assert false
		return
	}
	assert u.age == 10
	assert u.last_name == 'Johnson'
	assert u.is_registered == true
	assert u.nums.len == 3
	assert u.nums[0] == 1
	assert u.nums[1] == 2
	assert u.nums[2] == 3
	assert u.typ == 1
	assert u.pets == '{"name":"Bob","animal":"Dog"}'
}

fn test_encode_user() {
	usr := User{
		age: 10
		nums: [1, 2, 3]
		last_name: 'Johnson'
		is_registered: true
		typ: 0
		pets: 'foo'
	}
	expected := '{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"foo"}'
	out := json2.encode<User>(usr)
	assert out == expected
}

struct Color {
pub mut:
	space string
	point string [raw]
}

fn (mut c Color) from_json(an json2.Any) {
	mp := an.as_map()
	$for field in Color.fields {
		match field.name {
			'space' { c.space = mp[field.name].str() }
			'point' { c.point = mp[field.name].str() }
			else {}
		}
	}
}

fn test_raw_json_field() {
	color := json2.decode<Color>('{"space": "YCbCr", "point": {"Y": 123}}') or {
		assert false
		Color{}
	}
	assert color.point == '{"Y":123}'
	assert color.space == 'YCbCr'
}

/*
struct City {
	name string
}

struct Country {
	cities []City
	name   string
}

fn test_struct_in_struct() {
	country := json.decode(Country, '{ "name": "UK", "cities": [{"name":"London"}, {"name":"Manchester"}]}') or {
		assert false
		exit(1)
	}
	assert country.name == 'UK'
	assert country.cities.len == 2
	assert country.cities[0].name == 'London'
	assert country.cities[1].name == 'Manchester'
	println(country.cities)
}
*/
fn test_encode_map() {
	expected := '{"one":1,"two":2,"three":3,"four":4}'
	numbers := {
		'one':   json2.Any(1)
		'two':   json2.Any(2)
		'three': json2.Any(3)
		'four':  json2.Any(4)
	}
	out := numbers.str()
	assert out == expected
}

/*
fn test_parse_map() {
	expected := {
		'one': 1
		'two': 2
		'three': 3
		'four': 4
	}
	out := json.decode<map[string]int>('{"one":1,"two":2,"three":3,"four":4}') or {
		assert false
		r := {
			'': 0
		}
		r
	}
	println(out)
	assert out == expected
}

struct Data {
	countries []Country
	users     map[string]User
	extra     map[string]map[string]int
}

fn test_nested_type() {
	data_expected := '{"countries":[{"cities":[{"name":"London"},{"name":"Manchester"}],"name":"UK"},{"cities":[{"name":"Donlon"},{"name":"Termanches"}],"name":"KU"}],"users":{"Foo":{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"little foo"},"Boo":{"age":20,"nums":[5,3,1],"lastName":"Smith","IsRegistered":false,"type":4,"pet_animals":"little boo"}},"extra":{"2":{"n1":2,"n2":4,"n3":8,"n4":16},"3":{"n1":3,"n2":9,"n3":27,"n4":81}}}'

	data := Data{
		countries: [
			Country{
				name: 'UK'
				cities: [City{'London'},
					City{'Manchester'},
				]
			},
			Country{
				name: 'KU'
				cities: [City{'Donlon'},
					City{'Termanches'},
				]
			},
		]
		users: {
			'Foo': User{
				age: 10
				nums: [1, 2, 3]
				last_name: 'Johnson'
				is_registered: true
				typ: 0
				pets: 'little foo'
			},
			'Boo': User{
				age: 20
				nums: [5, 3, 1]
				last_name: 'Smith'
				is_registered: false
				typ: 4
				pets: 'little boo'
			}
		},
		extra: {
			'2': {
				'n1': 2
				'n2': 4
				'n3': 8
				'n4': 16
			},
			'3': {
				'n1': 3
				'n2': 9
				'n3': 27
				'n4': 81
			},
		}
	}
	out := json.encode(data)
	println(out)
	assert out == data_expected

	data2 := json.decode(Data, data_expected) or {
		assert false
		Data{}
	}
	assert data2.countries.len == data.countries.len
	for i in 0..1 {
		assert data2.countries[i].name == data.countries[i].name
		assert data2.countries[i].cities.len == data.countries[i].cities.len
		for j in 0..1 {
			assert data2.countries[i].cities[j].name == data.countries[i].cities[j].name
		}
	}

	for key, user in data.users {
		assert data2.users[key].age == user.age
		assert data2.users[key].nums == user.nums
		assert data2.users[key].last_name == user.last_name
		assert data2.users[key].is_registered == user.is_registered
		assert data2.users[key].typ == user.typ
		// assert data2.users[key].pets == user.pets // TODO FIX
	}

	for k, v in data.extra {
		for k2, v2 in v {
			assert data2.extra[k][k2] == v2
		}
	}
}

fn test_errors() {
	invalid_array := fn () {
		data := '{"countries":[{"cities":[{"name":"London"},{"name":"Manchester"}],"name":"UK"},{"cities":{"name":"Donlon"},"name":"KU"}],"users":{"Foo":{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"little foo"},"Boo":{"age":20,"nums":[5,3,1],"lastName":"Smith","IsRegistered":false,"type":4,"pet_animals":"little boo"}},"extra":{"2":{"n1":2,"n2":4,"n3":8,"n4":16},"3":{"n1":3,"n2":9,"n3":27,"n4":81}}}'

		json.decode(Data, data) or {
			println(err)
			assert err.starts_with('Json element is not an array:')
			return
		}
		assert false
	}
	invalid_object := fn() {
		data := '{"countries":[{"cities":[{"name":"London"},{"name":"Manchester"}],"name":"UK"},{"cities":[{"name":"Donlon"},{"name":"Termanches"}],"name":"KU"}],"users":[{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"little foo"},{"age":20,"nums":[5,3,1],"lastName":"Smith","IsRegistered":false,"type":4,"pet_animals":"little boo"}],"extra":{"2":{"n1":2,"n2":4,"n3":8,"n4":16},"3":{"n1":3,"n2":9,"n3":27,"n4":81}}}'

		json.decode(Data, data) or {
			println(err)
			assert err.starts_with('Json element is not an object:')
			return
		}
		assert false
	}
	invalid_array()
	invalid_object()
}
*/