import json as stdjson
import x.json2

struct Issue24950GateRecord {
    exit string
}

struct Issue24950RecordBase {
    gate &Issue24950GateRecord = unsafe { nil } @[omitempty]
}

struct Issue24950Record {
    Issue24950RecordBase
}

struct Issue24950Wrapper {
    gate &Issue24950GateRecord = unsafe { nil }
}

struct Issue25614Node {
mut:
    value    int
    children []&Issue25614Node
}

struct OptionalPointerRegressionMessage {
mut:
    id       int
    text     string
    reply_to ?&OptionalPointerRegressionMessage
}

fn test_decode_struct_with_reference_field() {
    decoded := json2.decode[Issue24950Wrapper]('{"gate":{"exit":"north"}}')!

    assert decoded.gate != unsafe { nil }
    assert decoded.gate.exit == 'north'
}

fn test_decode_embedded_struct_with_reference_field() {
    empty_std := stdjson.decode(Issue24950Record, '{}')!
    empty_json2 := json2.decode[Issue24950Record]('{}')!

    assert empty_std.Issue24950RecordBase.gate == unsafe { nil }
    assert empty_json2.Issue24950RecordBase.gate == unsafe { nil }

    populated_std := stdjson.decode(Issue24950Record, '{"gate":{"exit":"north"}}')!
    populated_json2 := json2.decode[Issue24950Record]('{"gate":{"exit":"north"}}')!

    assert populated_std.Issue24950RecordBase.gate != unsafe { nil }
    assert populated_json2.Issue24950RecordBase.gate != unsafe { nil }
    assert populated_std.Issue24950RecordBase.gate.exit == 'north'
    assert populated_json2.Issue24950RecordBase.gate.exit == 'north'
}

fn test_decode_top_level_reference_to_primitive() {
    decoded := json2.decode[&int]('1')!

    assert decoded != unsafe { nil }
    assert *decoded == 1
}

fn test_decode_top_level_reference_to_primitive_null() {
    decoded := json2.decode[&int]('null')!

    assert decoded == unsafe { nil }
}

fn test_decode_top_level_reference_to_struct() {
    decoded := json2.decode[&Issue25614Node]('{"value":1}')!

    assert decoded != unsafe { nil }
    assert decoded.value == 1
}

fn test_decode_struct_with_array_of_references() {
    decoded := json2.decode[Issue25614Node]('{"children":[{"value":1},{"value":2}]}')!

    assert decoded.children.len == 2
    assert decoded.children[0] != unsafe { nil }
    assert decoded.children[1] != unsafe { nil }
    assert decoded.children[0].value == 1
    assert decoded.children[1].value == 2
}

fn test_decode_optional_reference_field() {
    message :=
        json2.decode[OptionalPointerRegressionMessage]('{"id":1,"text":"Hello","reply_to":{"id":2,"text":"Hi","reply_to":null}}')!

    reply := message.reply_to or {
        assert false
        return
    }

    assert reply.id == 2
    assert reply.text == 'Hi'
    assert reply.reply_to == none
}