package rfctime

import (
	"encoding/json"
	"testing"
	"time"

	"git.blackforestbytes.com/BlackForestBytes/goext/timeext"
	"git.blackforestbytes.com/BlackForestBytes/goext/tst"
)

func TestRFC3339TimeRoundtripJSON(t *testing.T) {
	type Wrap struct {
		Value RFC3339Time `json:"v"`
	}

	val := NewRFC3339(time.Unix(1675951556, 0).In(timeext.TimezoneBerlin))
	w1 := Wrap{val}

	jstr1, err := json.Marshal(w1)
	if err != nil {
		t.Fatal(err)
	}

	if string(jstr1) != "{\"v\":\"2023-02-09T15:05:56+01:00\"}" {
		t.Errorf("unexpected json: %s", string(jstr1))
	}

	w2 := Wrap{}
	if err := json.Unmarshal(jstr1, &w2); err != nil {
		t.Fatal(err)
	}

	jstr2, err := json.Marshal(w2)
	if err != nil {
		t.Fatal(err)
	}

	tst.AssertEqual(t, string(jstr1), string(jstr2))

	if !w1.Value.EqualAny(w2.Value) {
		t.Errorf("time differs after roundtrip")
	}
}

func TestRFC3339TimeUnmarshalJSONInvalid(t *testing.T) {
	var v RFC3339Time
	if err := v.UnmarshalJSON([]byte(`"not-a-date"`)); err == nil {
		t.Errorf("expected error parsing invalid date")
	}
	if err := v.UnmarshalJSON([]byte(`12345`)); err == nil {
		t.Errorf("expected error for non-string json")
	}
}

func TestRFC3339TimeText(t *testing.T) {
	val := NewRFC3339(time.Date(2023, 2, 9, 15, 5, 56, 0, time.UTC))
	b, err := val.MarshalText()
	if err != nil {
		t.Fatal(err)
	}
	tst.AssertEqual(t, string(b), "2023-02-09T15:05:56Z")

	var v2 RFC3339Time
	if err := v2.UnmarshalText(b); err != nil {
		t.Fatal(err)
	}
	if !v2.Equal(val) {
		t.Errorf("text roundtrip mismatch")
	}

	if err := v2.UnmarshalText([]byte("garbage")); err == nil {
		t.Errorf("expected error on bad text")
	}
}

func TestRFC3339TimeBinaryAndGob(t *testing.T) {
	val := NewRFC3339(time.Date(2023, 2, 9, 15, 5, 56, 123, time.UTC))

	bin, err := val.MarshalBinary()
	if err != nil {
		t.Fatal(err)
	}
	var v2 RFC3339Time
	if err := v2.UnmarshalBinary(bin); err != nil {
		t.Fatal(err)
	}
	if !v2.Equal(val) {
		t.Errorf("binary roundtrip mismatch")
	}

	gob, err := val.GobEncode()
	if err != nil {
		t.Fatal(err)
	}
	var v3 RFC3339Time
	if err := v3.GobDecode(gob); err != nil {
		t.Fatal(err)
	}
	if !v3.Equal(val) {
		t.Errorf("gob roundtrip mismatch")
	}
}

func TestRFC3339TimeAccessors(t *testing.T) {
	loc, _ := time.LoadLocation("UTC")
	tm := time.Date(2023, 5, 17, 14, 30, 45, 123456789, loc)
	val := NewRFC3339(tm)

	tst.AssertEqual(t, val.Year(), 2023)
	tst.AssertEqual(t, val.Month(), time.May)
	tst.AssertEqual(t, val.Day(), 17)
	tst.AssertEqual(t, val.Hour(), 14)
	tst.AssertEqual(t, val.Minute(), 30)
	tst.AssertEqual(t, val.Second(), 45)
	tst.AssertEqual(t, val.Nanosecond(), 123456789)
	tst.AssertEqual(t, val.Weekday(), time.Wednesday)
	tst.AssertEqual(t, val.YearDay(), tm.YearDay())
	tst.AssertEqual(t, val.Unix(), tm.Unix())
	tst.AssertEqual(t, val.UnixMilli(), tm.UnixMilli())
	tst.AssertEqual(t, val.UnixMicro(), tm.UnixMicro())
	tst.AssertEqual(t, val.UnixNano(), tm.UnixNano())
	tst.AssertEqual(t, val.Location(), loc)
	tst.AssertEqual(t, val.Format(time.RFC3339), tm.Format(time.RFC3339))
	tst.AssertEqual(t, val.GoString(), tm.GoString())
	tst.AssertEqual(t, val.String(), tm.String())
	tst.AssertEqual(t, val.Serialize(), tm.Format(time.RFC3339))
	tst.AssertEqual(t, val.FormatStr(), time.RFC3339)

	y, mo, d := val.Date()
	tst.AssertEqual(t, y, 2023)
	tst.AssertEqual(t, mo, time.May)
	tst.AssertEqual(t, d, 17)

	wy, ww := val.ISOWeek()
	ey, ew := tm.ISOWeek()
	tst.AssertEqual(t, wy, ey)
	tst.AssertEqual(t, ww, ew)

	h, m, s := val.Clock()
	tst.AssertEqual(t, h, 14)
	tst.AssertEqual(t, m, 30)
	tst.AssertEqual(t, s, 45)

	tst.AssertEqual(t, val.IsZero(), false)
	tst.AssertEqual(t, RFC3339Time{}.IsZero(), true)
}

func TestRFC3339TimeAddSub(t *testing.T) {
	tm := time.Date(2023, 5, 17, 14, 30, 45, 0, time.UTC)
	a := NewRFC3339(tm)
	b := a.Add(2 * time.Hour)

	tst.AssertEqual(t, b.Sub(a), 2*time.Hour)
	tst.AssertEqual(t, b.After(a), true)
	tst.AssertEqual(t, a.Before(b), true)
	tst.AssertEqual(t, a.After(b), false)
	tst.AssertEqual(t, b.Before(a), false)

	c := a.AddDate(1, 2, 3)
	tst.AssertEqual(t, c.Year(), 2024)
	tst.AssertEqual(t, c.Month(), time.July)
	tst.AssertEqual(t, c.Day(), 20)
}

func TestRFC3339TimeEqual(t *testing.T) {
	tm := time.Date(2023, 5, 17, 14, 30, 45, 0, time.UTC)
	a := NewRFC3339(tm)
	b := NewRFC3339(tm)
	c := NewRFC3339(tm.Add(time.Second))

	tst.AssertEqual(t, a.Equal(b), true)
	tst.AssertEqual(t, a.Equal(c), false)
	tst.AssertEqual(t, a.EqualAny(b), true)
	tst.AssertEqual(t, a.EqualAny(c), false)
	tst.AssertEqual(t, a.EqualAny(nil), false)
	// Cross-type comparison via tt()
	tst.AssertEqual(t, a.EqualAny(NewRFC3339Nano(tm)), true)
	tst.AssertEqual(t, a.EqualAny(tm), true)
}

func TestRFC3339TimeToNano(t *testing.T) {
	tm := time.Date(2023, 5, 17, 14, 30, 45, 12345, time.UTC)
	a := NewRFC3339(tm)
	n := a.ToNano()
	tst.AssertEqual(t, n.UnixNano(), tm.UnixNano())
}

func TestNowRFC3339(t *testing.T) {
	before := time.Now()
	v := NowRFC3339()
	after := time.Now()

	if v.Time().Before(before.Add(-time.Second)) || v.Time().After(after.Add(time.Second)) {
		t.Errorf("NowRFC3339 not within expected range")
	}
}