import json
import time

const default_time = time.parse('2025-04-16 12:00:00') or {time.now()}

type Any = string | []map[string]?Any | time.Time

struct Users {
mut:
	id         string
	created_at time.Time
}

struct EmbeddedStruct {
	v int
}

struct MyStruct {
	a       int
	opt_a   ?int
	s       string
	opt_s   ?string
	t       time.Time = default_time
	opt_v   ?EmbeddedStruct
	opt_t   ?time.Time
	opt_u64 ?u64
}

data_all := [Users{
	id:         '123'
	created_at: default_time
}, Users{
	id:         'asd'
	created_at: default_time
}]

mut result := []map[string]?Any{}
for raw in data_all {
	mut data := map[string]?Any{}
	data['id'] = raw.id
	data['time'] = raw.created_at
	result << data
}

println(result)

msg := json.encode(result)
println(msg)

x := MyStruct{
	a: 1
	s: 'hello'
	t: default_time
	// opt_t : default_time
	opt_u64: 123456
}

y := json.encode(x)
println(y)

k := json.decode(MyStruct, y)!
println(k)