package lagoon

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

func TestDateSmoke(t *testing.T) {
	d, err := ParseDate("2026-10-02")
	if err != nil || d.String() != "2026-10-02" || d.IsZero() {
		t.Fatalf("parse: %v %v", d, err)
	}
	if _, err := ParseDate("2026-10-02T00:00:00Z"); err == nil {
		t.Fatal("ParseDate must accept only YYYY-MM-DD")
	}
	b, err := json.Marshal(struct {
		Day  Date  `json:"day"`
		None *Date `json:"none"`
		Zero Date  `json:"zero"`
	}{Day: d})
	if err != nil || string(b) != `{"day":"2026-10-02","none":null,"zero":null}` {
		t.Fatalf("marshal %s %v", b, err)
	}
	var back struct {
		Day Date `json:"day"`
	}
	if err := json.Unmarshal([]byte(`{"day":"2026-10-02"}`), &back); err != nil || back.Day != d {
		t.Fatalf("unmarshal %v %v", back.Day, err)
	}

	// pgx returns DATE as UTC midnight; the calendar date is kept whatever
	// the process time zone.
	var scanned Date
	if err := scanned.Scan(time.Date(2026, 10, 2, 0, 0, 0, 0, time.UTC)); err != nil || scanned != d {
		t.Fatalf("scan time %v %v", scanned, err)
	}
	if err := scanned.Scan("2026-10-03"); err != nil || scanned.String() != "2026-10-03" {
		t.Fatalf("scan string %v %v", scanned, err)
	}
	if err := scanned.Scan(nil); err != nil || !scanned.IsZero() {
		t.Fatalf("scan nil %v %v", scanned, err)
	}
	if v, err := (Date{}).Value(); v != nil || err != nil {
		t.Fatalf("zero value %v %v", v, err)
	}
	if v, err := d.Value(); v != "2026-10-02" || err != nil {
		t.Fatalf("value %v %v", v, err)
	}
	if got := NewDate(2026, 9, 31).String(); got != "2026-10-01" {
		t.Fatalf("NewDate normalises: %s", got)
	}
	if got := DateOf(time.Date(2026, 10, 2, 23, 30, 0, 0, time.FixedZone("x", -7*3600))).String(); got != "2026-10-02" {
		t.Fatalf("DateOf keeps the location's date: %s", got)
	}
}

func TestTimeOfDaySmoke(t *testing.T) {
	tod, err := ParseTimeOfDay("14:30")
	if err != nil || tod.String() != "14:30:00" {
		t.Fatalf("parse: %v %v", tod, err)
	}
	if tod, err := ParseTimeOfDay("14:30:15.987654"); err != nil || tod.String() != "14:30:15" {
		t.Fatalf("fraction: %v %v", tod, err)
	}
	if _, err := ParseTimeOfDay("25:00"); err == nil {
		t.Fatal("25:00 must fail")
	}
	midnight := NewTimeOfDay(0, 0, 0)
	if midnight.IsZero() {
		t.Fatal("midnight is a set value")
	}
	b, err := json.Marshal([]TimeOfDay{tod, {}})
	if err != nil || string(b) != `["14:30:00",null]` {
		t.Fatalf("marshal %s %v", b, err)
	}
	var scanned TimeOfDay
	if err := scanned.Scan("09:05:07"); err != nil || scanned.Hour() != 9 || scanned.Minute() != 5 || scanned.Second() != 7 {
		t.Fatalf("scan %v %v", scanned, err)
	}
	if v, err := (TimeOfDay{}).Value(); v != nil || err != nil {
		t.Fatalf("zero value %v %v", v, err)
	}
}

type fillDates struct {
	At     time.Time  `gorm:"column:at"`
	AtPtr  *time.Time `gorm:"column:at_ptr"`
	Day    Date       `gorm:"column:day"`
	DayPtr *Date      `gorm:"column:day_ptr"`
	Clock  TimeOfDay  `gorm:"column:clock"`
	ClkPtr *TimeOfDay `gorm:"column:clock_ptr"`
}

func TestFillTextSmoke(t *testing.T) {
	var m fillDates
	allowed := []string{"at", "at_ptr", "day", "day_ptr", "clock", "clock_ptr"}
	err := Fill(&m, allowed, map[string]any{
		"at":        "2026-10-02T12:30:00Z",
		"at_ptr":    "2026-10-02T14:30:00+02:00",
		"day":       "2026-10-02",
		"day_ptr":   "2026-10-03",
		"clock":     "14:30",
		"clock_ptr": "08:15:00",
	}, true)
	if err != nil {
		t.Fatal(err)
	}
	want := time.Date(2026, 10, 2, 12, 30, 0, 0, time.UTC)
	if !m.At.Equal(want) || m.AtPtr == nil || !m.AtPtr.Equal(want) {
		t.Fatalf("times %v %v", m.At, m.AtPtr)
	}
	if m.Day.String() != "2026-10-02" || m.DayPtr == nil || m.DayPtr.String() != "2026-10-03" {
		t.Fatalf("dates %v %v", m.Day, m.DayPtr)
	}
	if m.Clock.String() != "14:30:00" || m.ClkPtr == nil || m.ClkPtr.String() != "08:15:00" {
		t.Fatalf("clocks %v %v", m.Clock, m.ClkPtr)
	}
	err = Fill(&m, allowed, map[string]any{"day": "next tuesday"}, true)
	var fte *FillTypeError
	if !errors.As(err, &fte) || fte.Key != "day" {
		t.Fatalf("garbage date: %v", err)
	}
}

func TestValidateRequiredZeroDateSmoke(t *testing.T) {
	rules := map[string]string{"day": "required"}
	errs, err := Validate(t.Context(), nil, &fillDates{}, rules, map[string]any{"day": Date{}}, nil)
	if err != nil || len(errs["day"]) != 1 {
		t.Fatalf("zero date: %v %v", errs, err)
	}
	errs, err = Validate(t.Context(), nil, &fillDates{}, rules, map[string]any{"day": NewDate(2026, 10, 2)}, nil)
	if err != nil || errs != nil {
		t.Fatalf("set date: %v %v", errs, err)
	}
}