package null

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

var (
	timeString    = "2012-12-21T21:21:21Z"
	timeJSON      = []byte(`"` + timeString + `"`)
	blankTimeJSON = []byte(`null`)
	timeValue, _  = time.Parse(time.RFC3339, timeString)
)

func TestUnmarshalTimeString(t *testing.T) {
	var ti Time
	err := json.Unmarshal(timeJSON, &ti)
	maybePanic(err)
	assertTime(t, ti, "UnmarshalJSON() json")

	var blank Time
	err = json.Unmarshal(blankTimeJSON, &blank)
	maybePanic(err)
	assertNullTime(t, blank, "blank time json")
}

func TestMarshalTime(t *testing.T) {
	ti := TimeFrom(timeValue)
	data, err := json.Marshal(ti)
	maybePanic(err)
	assertJSONEquals(t, data, string(timeJSON), "non-empty json marshal")
}

func TestTimeFrom(t *testing.T) {
	ti := TimeFrom(timeValue)
	assertTime(t, ti, "TimeFrom() time.Time")
}

func TestTimeFromPtr(t *testing.T) {
	ti := TimeFromPtr(&timeValue)
	assertTime(t, ti, "TimeFromPtr() time")

	null := TimeFromPtr(nil)
	assertNullTime(t, null, "TimeFromPtr(nil)")
}

func TestTimeSetValid(t *testing.T) {
	var ti time.Time
	change := NewTime(ti, false)
	assertNullTime(t, change, "SetValid()")
	change.SetValid(timeValue)
	assertTime(t, change, "SetValid()")
}

func TestTimePointer(t *testing.T) {
	ti := TimeFrom(timeValue)
	ptr := ti.Ptr()
	if *ptr != timeValue {
		t.Errorf("bad %s time: %#v ≠ %v\n", "pointer", ptr, timeValue)
	}

	var nt time.Time
	null := NewTime(nt, false)
	ptr = null.Ptr()
	if ptr != nil {
		t.Errorf("bad %s time: %#v ≠ %s\n", "nil pointer", ptr, "nil")
	}
}

func TestTimeScan(t *testing.T) {
	var ti Time
	err := ti.Scan(timeValue)
	maybePanic(err)
	assertTime(t, ti, "scanned time")

	var null Time
	err = null.Scan(nil)
	maybePanic(err)
	assertNullTime(t, null, "scanned null")
}

func assertTime(t *testing.T, ti Time, from string) {
	if ti.Time != timeValue {
		t.Errorf("bad %v time: %v ≠ %v\n", from, ti.Time, timeValue)
	}
	if !ti.Valid {
		t.Error(from, "is invalid, but should be valid")
	}
}

func assertNullTime(t *testing.T, ti Time, from string) {
	if ti.Valid {
		t.Error(from, "is valid, but should be invalid")
	}
}