package db

import (
	"testing"
	"time"
)

func ptr[T any](v T) *T {
	return &v
}

func TestCreate_Note(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "hello world", Glyph: GlyphNote}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}
	if e.ID == "" {
		t.Fatal("ID not set")
	}

	got, err := s.Get(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.Body != "hello world" {
		t.Errorf("body: got %q", got.Body)
	}
	if got.Glyph != GlyphNote {
		t.Errorf("glyph: got %q", got.Glyph)
	}
}

func TestCreate_TodoWithTimeAnchor(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "deploy", Glyph: GlyphTodo, TimeAnchor: ptr("14:00")}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}

	got, err := s.Get(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.TimeAnchor == nil || *got.TimeAnchor != "14:00" {
		t.Errorf("time_anchor: got %v", got.TimeAnchor)
	}
}

func TestCreate_WithTags(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "deploy nginx", Glyph: GlyphNote, Tags: []string{"ops", "nginx"}}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}

	got, err := s.Get(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if len(got.Tags) != 2 {
		t.Fatalf("expected 2 tags, got %d", len(got.Tags))
	}
}

func TestCreate_WithCardType(t *testing.T) {
	s := testStore(t)
	ct := CardSnippet
	e := &Entity{Body: "trick", Glyph: GlyphNote, CardType: &ct}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}

	got, err := s.Get(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.CardType == nil || *got.CardType != CardSnippet {
		t.Errorf("card_type: got %v", got.CardType)
	}
}

func TestGet_NotFound(t *testing.T) {
	s := testStore(t)
	_, err := s.Get("01NONEXISTENT0000000000000")
	if err != ErrNotFound {
		t.Errorf("expected ErrNotFound, got %v", err)
	}
}

func TestList_DefaultParams(t *testing.T) {
	s := testStore(t)
	for i := 0; i < 3; i++ {
		s.Create(&Entity{Body: "note", Glyph: GlyphNote})
	}

	entities, err := s.List(DefaultListParams())
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 3 {
		t.Fatalf("expected 3, got %d", len(entities))
	}
	// desc order: newest first
	if entities[0].CreatedAt.Before(entities[2].CreatedAt) {
		t.Error("expected newest first")
	}
}

func TestList_FilterByTag(t *testing.T) {
	s := testStore(t)
	s.Create(&Entity{Body: "a", Glyph: GlyphNote, Tags: []string{"ops"}})
	s.Create(&Entity{Body: "b", Glyph: GlyphNote, Tags: []string{"home"}})
	s.Create(&Entity{Body: "c", Glyph: GlyphNote, Tags: []string{"ops", "home"}})

	p := DefaultListParams()
	tag := "ops"
	p.Tag = &tag

	entities, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 2 {
		t.Errorf("expected 2 entities with tag ops, got %d", len(entities))
	}
}

func TestList_FilterByDate(t *testing.T) {
	s := testStore(t)
	s.Create(&Entity{Body: "today", Glyph: GlyphNote})

	p := DefaultListParams()
	date := time.Now().UTC().Format("2006-01-02")
	p.Date = &date

	entities, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 1 {
		t.Errorf("expected 1, got %d", len(entities))
	}

	otherDate := "2020-01-01"
	p.Date = &otherDate
	entities, err = s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 0 {
		t.Errorf("expected 0 for past date, got %d", len(entities))
	}
}

func TestList_CardsOnly(t *testing.T) {
	s := testStore(t)
	s.Create(&Entity{Body: "fluid", Glyph: GlyphNote})
	ct := CardSnippet
	s.Create(&Entity{Body: "card", Glyph: GlyphNote, CardType: &ct})

	p := DefaultListParams()
	p.CardsOnly = true
	entities, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 1 {
		t.Fatalf("expected 1 card, got %d", len(entities))
	}
	if entities[0].Body != "card" {
		t.Errorf("expected card entity, got %q", entities[0].Body)
	}
}

func TestList_IncludeDeleted(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "doomed", Glyph: GlyphNote}
	s.Create(e)
	s.SoftDelete(e.ID)

	p := DefaultListParams()
	entities, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 0 {
		t.Error("deleted entity should be excluded by default")
	}

	p.IncludeDeleted = true
	entities, err = s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(entities) != 1 {
		t.Error("deleted entity should appear with include_deleted")
	}
}

func TestList_SortByUseCount(t *testing.T) {
	s := testStore(t)
	ct := CardSnippet
	e1 := &Entity{Body: "low", Glyph: GlyphNote, CardType: &ct}
	e2 := &Entity{Body: "high", Glyph: GlyphNote, CardType: &ct}
	s.Create(e1)
	s.Create(e2)
	s.IncrementUse(e2.ID)
	s.IncrementUse(e2.ID)

	p := DefaultListParams()
	p.Sort = "use_count"
	entities, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if entities[0].Body != "high" {
		t.Errorf("expected highest use first, got %q", entities[0].Body)
	}
}

func TestList_Pagination(t *testing.T) {
	s := testStore(t)
	for i := 0; i < 10; i++ {
		s.Create(&Entity{Body: "note", Glyph: GlyphNote})
	}

	p := DefaultListParams()
	p.Limit = 3
	p.Offset = 0
	page1, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(page1) != 3 {
		t.Fatalf("expected 3, got %d", len(page1))
	}

	p.Offset = 3
	page2, err := s.List(p)
	if err != nil {
		t.Fatal(err)
	}
	if len(page2) != 3 {
		t.Fatalf("expected 3, got %d", len(page2))
	}
	if page1[0].ID == page2[0].ID {
		t.Error("pages should not overlap")
	}
}

func TestUpdate_Body(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "old", Glyph: GlyphNote}
	s.Create(e)

	time.Sleep(1100 * time.Millisecond)
	newBody := "new"
	if err := s.Update(e.ID, &EntityUpdate{Body: &newBody}); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.Body != "new" {
		t.Errorf("body not updated: %q", got.Body)
	}
	if !got.ModifiedAt.After(e.ModifiedAt) {
		t.Error("modified_at not updated")
	}
}

func TestUpdate_Tags(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "test", Glyph: GlyphNote, Tags: []string{"old"}}
	s.Create(e)

	newTags := []string{"new1", "new2"}
	if err := s.Update(e.ID, &EntityUpdate{Tags: &newTags}); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if len(got.Tags) != 2 {
		t.Fatalf("expected 2 tags, got %d: %v", len(got.Tags), got.Tags)
	}
}

func TestPromote_Success(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "trick", Glyph: GlyphNote}
	s.Create(e)

	if err := s.Promote(e.ID, CardSnippet, nil); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.CardType == nil || *got.CardType != CardSnippet {
		t.Errorf("expected snippet, got %v", got.CardType)
	}
}

func TestPromote_AlreadyPromoted(t *testing.T) {
	s := testStore(t)
	ct := CardSnippet
	e := &Entity{Body: "trick", Glyph: GlyphNote, CardType: &ct}
	s.Create(e)

	if err := s.Promote(e.ID, CardTemplate, nil); err != ErrAlreadyPromoted {
		t.Errorf("expected ErrAlreadyPromoted, got %v", err)
	}
}

func TestDemote_Success(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "trick", Glyph: GlyphNote}
	s.Create(e)
	s.Promote(e.ID, CardSnippet, nil)

	if err := s.Demote(e.ID); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.CardType != nil {
		t.Errorf("expected nil card_type, got %v", got.CardType)
	}
	if got.UseCount != 0 {
		t.Errorf("expected use_count reset to 0, got %d", got.UseCount)
	}
}

func TestDemote_AlreadyFluid(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "trick", Glyph: GlyphNote}
	s.Create(e)

	if err := s.Demote(e.ID); err != ErrAlreadyFluid {
		t.Errorf("expected ErrAlreadyFluid, got %v", err)
	}
}

func TestSoftDelete_First(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "doomed", Glyph: GlyphNote}
	s.Create(e)

	result, err := s.SoftDelete(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if result != DeletedSoft {
		t.Errorf("expected DeletedSoft, got %d", result)
	}

	got, _ := s.Get(e.ID)
	if got.DeletedAt == nil {
		t.Error("expected deleted_at to be set")
	}
}

func TestSoftDelete_Second(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "doomed", Glyph: GlyphNote}
	s.Create(e)

	s.SoftDelete(e.ID)
	result, err := s.SoftDelete(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if result != DeletedHard {
		t.Errorf("expected DeletedHard, got %d", result)
	}

	_, err = s.Get(e.ID)
	if err != ErrNotFound {
		t.Errorf("expected ErrNotFound after hard delete, got %v", err)
	}
}

func TestSoftDelete_NotFound(t *testing.T) {
	s := testStore(t)
	_, err := s.SoftDelete("01NONEXISTENT0000000000000")
	if err != ErrNotFound {
		t.Errorf("expected ErrNotFound, got %v", err)
	}
}

func TestIncrementUse(t *testing.T) {
	s := testStore(t)
	ct := CardSnippet
	e := &Entity{Body: "trick", Glyph: GlyphNote, CardType: &ct}
	s.Create(e)

	if err := s.IncrementUse(e.ID); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.UseCount != 1 {
		t.Errorf("expected use_count=1, got %d", got.UseCount)
	}
	if got.LastUsedAt == nil {
		t.Error("expected last_used_at to be set")
	}
}

func TestResolve_FullID(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "test", Glyph: GlyphNote}
	s.Create(e)

	got, err := s.Resolve(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got != e.ID {
		t.Errorf("expected %s, got %s", e.ID, got)
	}
}

func TestResolve_Prefix(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "test", Glyph: GlyphNote}
	s.Create(e)

	got, err := s.Resolve(e.ID[:6])
	if err != nil {
		t.Fatal(err)
	}
	if got != e.ID {
		t.Errorf("expected %s, got %s", e.ID, got)
	}
}

func TestResolve_NotFound(t *testing.T) {
	s := testStore(t)
	_, err := s.Resolve("ZZZZZZZZZ")
	if err != ErrNotFound {
		t.Errorf("expected ErrNotFound, got %v", err)
	}
}

func TestAbsorb_SourceIsCard(t *testing.T) {
	s := testStore(t)
	target := &Entity{Body: "target", Glyph: GlyphNote, Tags: []string{"a"}}
	s.Create(target)

	source := &Entity{Body: "source", Glyph: GlyphNote}
	s.Create(source)
	s.Promote(source.ID, CardSnippet, nil)
	s.IncrementUse(source.ID)

	if err := s.Absorb(target.ID, source.ID); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(target.ID)
	if got.Body != "target\nsource" {
		t.Errorf("merged body: %q", got.Body)
	}

	src, _ := s.Get(source.ID)
	if src.CardType != nil {
		t.Error("source card_type should be cleared after absorb")
	}
	if src.UseCount != 0 {
		t.Errorf("source use_count should be reset, got %d", src.UseCount)
	}
	if src.DeletedAt == nil {
		t.Error("source should be soft-deleted")
	}
}

func TestCreate_WithTitleAndDescription(t *testing.T) {
	s := testStore(t)
	e := &Entity{
		Body:        "body text",
		Title:       ptr("nginx trick"),
		Description: ptr("always forget this"),
		Glyph:       GlyphNote,
		Tags:        []string{"ops"},
	}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}

	got, err := s.Get(e.ID)
	if err != nil {
		t.Fatal(err)
	}
	if got.Title == nil || *got.Title != "nginx trick" {
		t.Errorf("title: got %v", got.Title)
	}
	if got.Description == nil || *got.Description != "always forget this" {
		t.Errorf("description: got %v", got.Description)
	}
	if got.Body != "body text" {
		t.Errorf("body: got %q", got.Body)
	}
}

func TestCreate_WithoutTitle(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "just body", Glyph: GlyphNote}
	if err := s.Create(e); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.Title != nil {
		t.Errorf("expected nil title, got %v", got.Title)
	}
	if got.Description != nil {
		t.Errorf("expected nil description, got %v", got.Description)
	}
}

func TestUpdate_Title(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "body", Glyph: GlyphNote}
	s.Create(e)

	newTitle := "new title"
	if err := s.Update(e.ID, &EntityUpdate{Title: &newTitle}); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.Title == nil || *got.Title != "new title" {
		t.Errorf("title: got %v", got.Title)
	}
}

func TestUpdate_Description(t *testing.T) {
	s := testStore(t)
	e := &Entity{Body: "body", Glyph: GlyphNote}
	s.Create(e)

	newDesc := "new desc"
	if err := s.Update(e.ID, &EntityUpdate{Description: &newDesc}); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(e.ID)
	if got.Description == nil || *got.Description != "new desc" {
		t.Errorf("description: got %v", got.Description)
	}
}

func TestAbsorb_PreservesTargetTitle(t *testing.T) {
	s := testStore(t)
	target := &Entity{Body: "target body", Title: ptr("target title"), Glyph: GlyphNote}
	source := &Entity{Body: "source body", Title: ptr("source title"), Glyph: GlyphNote}
	s.Create(target)
	s.Create(source)

	if err := s.Absorb(target.ID, source.ID); err != nil {
		t.Fatal(err)
	}

	got, _ := s.Get(target.ID)
	if got.Title == nil || *got.Title != "target title" {
		t.Errorf("target title should be preserved, got %v", got.Title)
	}
	if got.Body != "target body\nsource body" {
		t.Errorf("body: got %q", got.Body)
	}
}