package nostr

import (
	"encoding/json"
	"testing"
)

func TestFilterMarshalJSON(t *testing.T) {
	since := int64(1704067200)
	until := int64(1704153600)

	filter := Filter{
		IDs:     []string{"abc123"},
		Kinds:   []int{1, 7},
		Authors: []string{"def456"},
		Tags: map[string][]string{
			"e": {"event1", "event2"},
			"p": {"pubkey1"},
		},
		Since: &since,
		Until: &until,
		Limit: 100,
	}

	data, err := filter.MarshalJSON()
	if err != nil {
		t.Fatalf("MarshalJSON() error = %v", err)
	}

	// Parse and check structure
	var m map[string]interface{}
	if err := json.Unmarshal(data, &m); err != nil {
		t.Fatalf("Failed to unmarshal: %v", err)
	}

	// Check regular fields
	if _, ok := m["ids"]; !ok {
		t.Error("ids field missing")
	}
	if _, ok := m["kinds"]; !ok {
		t.Error("kinds field missing")
	}
	if _, ok := m["authors"]; !ok {
		t.Error("authors field missing")
	}
	if _, ok := m["since"]; !ok {
		t.Error("since field missing")
	}
	if _, ok := m["until"]; !ok {
		t.Error("until field missing")
	}
	if _, ok := m["limit"]; !ok {
		t.Error("limit field missing")
	}

	// Check tag filters with # prefix
	if _, ok := m["#e"]; !ok {
		t.Error("#e field missing")
	}
	if _, ok := m["#p"]; !ok {
		t.Error("#p field missing")
	}
}

func TestFilterMarshalJSONOmitsEmpty(t *testing.T) {
	filter := Filter{
		Kinds: []int{1},
	}

	data, err := filter.MarshalJSON()
	if err != nil {
		t.Fatalf("MarshalJSON() error = %v", err)
	}

	var m map[string]interface{}
	if err := json.Unmarshal(data, &m); err != nil {
		t.Fatalf("Failed to unmarshal: %v", err)
	}

	if _, ok := m["ids"]; ok {
		t.Error("empty ids should be omitted")
	}
	if _, ok := m["authors"]; ok {
		t.Error("empty authors should be omitted")
	}
	if _, ok := m["since"]; ok {
		t.Error("nil since should be omitted")
	}
	if _, ok := m["until"]; ok {
		t.Error("nil until should be omitted")
	}
	if _, ok := m["limit"]; ok {
		t.Error("zero limit should be omitted")
	}
}

func TestFilterUnmarshalJSON(t *testing.T) {
	jsonData := `{
		"ids": ["abc123"],
		"kinds": [1, 7],
		"authors": ["def456"],
		"#e": ["event1", "event2"],
		"#p": ["pubkey1"],
		"since": 1704067200,
		"until": 1704153600,
		"limit": 100
	}`

	var filter Filter
	if err := json.Unmarshal([]byte(jsonData), &filter); err != nil {
		t.Fatalf("UnmarshalJSON() error = %v", err)
	}

	if len(filter.IDs) != 1 || filter.IDs[0] != "abc123" {
		t.Errorf("IDs = %v, want [abc123]", filter.IDs)
	}
	if len(filter.Kinds) != 2 {
		t.Errorf("Kinds length = %d, want 2", len(filter.Kinds))
	}
	if len(filter.Authors) != 1 || filter.Authors[0] != "def456" {
		t.Errorf("Authors = %v, want [def456]", filter.Authors)
	}
	if filter.Since == nil || *filter.Since != 1704067200 {
		t.Errorf("Since = %v, want 1704067200", filter.Since)
	}
	if filter.Until == nil || *filter.Until != 1704153600 {
		t.Errorf("Until = %v, want 1704153600", filter.Until)
	}
	if filter.Limit != 100 {
		t.Errorf("Limit = %d, want 100", filter.Limit)
	}

	// Check tag filters
	if len(filter.Tags["e"]) != 2 {
		t.Errorf("Tags[e] length = %d, want 2", len(filter.Tags["e"]))
	}
	if len(filter.Tags["p"]) != 1 {
		t.Errorf("Tags[p] length = %d, want 1", len(filter.Tags["p"]))
	}
}

func TestFilterMatchesIDs(t *testing.T) {
	filter := Filter{
		IDs: []string{"abc", "def456"},
	}

	tests := []struct {
		id   string
		want bool
	}{
		{"abc123", true},     // matches prefix "abc"
		{"abcdef", true},     // matches prefix "abc"
		{"def456", true},     // exact match
		{"def456xyz", true},  // matches prefix "def456"
		{"xyz789", false},    // no match
		{"ab", false},        // "ab" doesn't start with "abc"
	}

	for _, tt := range tests {
		event := &Event{ID: tt.id}
		if got := filter.Matches(event); got != tt.want {
			t.Errorf("Matches() with ID %s = %v, want %v", tt.id, got, tt.want)
		}
	}
}

func TestFilterMatchesAuthors(t *testing.T) {
	filter := Filter{
		Authors: []string{"pubkey1", "pubkey2"},
	}

	tests := []struct {
		pubkey string
		want   bool
	}{
		{"pubkey1", true},
		{"pubkey1abc", true}, // Prefix match
		{"pubkey2", true},
		{"pubkey3", false},
	}

	for _, tt := range tests {
		event := &Event{PubKey: tt.pubkey}
		if got := filter.Matches(event); got != tt.want {
			t.Errorf("Matches() with PubKey %s = %v, want %v", tt.pubkey, got, tt.want)
		}
	}
}

func TestFilterMatchesKinds(t *testing.T) {
	filter := Filter{
		Kinds: []int{1, 7},
	}

	tests := []struct {
		kind int
		want bool
	}{
		{1, true},
		{7, true},
		{0, false},
		{4, false},
	}

	for _, tt := range tests {
		event := &Event{Kind: tt.kind}
		if got := filter.Matches(event); got != tt.want {
			t.Errorf("Matches() with Kind %d = %v, want %v", tt.kind, got, tt.want)
		}
	}
}

func TestFilterMatchesSince(t *testing.T) {
	since := int64(1704067200)
	filter := Filter{
		Since: &since,
	}

	tests := []struct {
		createdAt int64
		want      bool
	}{
		{1704067200, true},  // Equal
		{1704067201, true},  // After
		{1704067199, false}, // Before
	}

	for _, tt := range tests {
		event := &Event{CreatedAt: tt.createdAt}
		if got := filter.Matches(event); got != tt.want {
			t.Errorf("Matches() with CreatedAt %d = %v, want %v", tt.createdAt, got, tt.want)
		}
	}
}

func TestFilterMatchesUntil(t *testing.T) {
	until := int64(1704067200)
	filter := Filter{
		Until: &until,
	}

	tests := []struct {
		createdAt int64
		want      bool
	}{
		{1704067200, true},  // Equal
		{1704067199, true},  // Before
		{1704067201, false}, // After
	}

	for _, tt := range tests {
		event := &Event{CreatedAt: tt.createdAt}
		if got := filter.Matches(event); got != tt.want {
			t.Errorf("Matches() with CreatedAt %d = %v, want %v", tt.createdAt, got, tt.want)
		}
	}
}

func TestFilterMatchesTags(t *testing.T) {
	filter := Filter{
		Tags: map[string][]string{
			"e": {"event1"},
			"p": {"pubkey1", "pubkey2"},
		},
	}

	tests := []struct {
		name string
		tags Tags
		want bool
	}{
		{
			name: "matches all",
			tags: Tags{{"e", "event1"}, {"p", "pubkey1"}},
			want: true,
		},
		{
			name: "matches with different p",
			tags: Tags{{"e", "event1"}, {"p", "pubkey2"}},
			want: true,
		},
		{
			name: "missing e tag",
			tags: Tags{{"p", "pubkey1"}},
			want: false,
		},
		{
			name: "wrong e value",
			tags: Tags{{"e", "event2"}, {"p", "pubkey1"}},
			want: false,
		},
		{
			name: "extra tags ok",
			tags: Tags{{"e", "event1"}, {"p", "pubkey1"}, {"t", "test"}},
			want: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			event := &Event{Tags: tt.tags}
			if got := filter.Matches(event); got != tt.want {
				t.Errorf("Matches() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestFilterMatchesEmpty(t *testing.T) {
	// Empty filter matches everything
	filter := Filter{}
	event := &Event{
		ID:        "abc123",
		PubKey:    "pubkey1",
		CreatedAt: 1704067200,
		Kind:      1,
		Tags:      Tags{{"e", "event1"}},
		Content:   "test",
	}

	if !filter.Matches(event) {
		t.Error("Empty filter should match all events")
	}
}

func TestFilterClone(t *testing.T) {
	since := int64(1704067200)
	until := int64(1704153600)

	original := &Filter{
		IDs:     []string{"id1", "id2"},
		Kinds:   []int{1, 7},
		Authors: []string{"author1"},
		Tags: map[string][]string{
			"e": {"event1"},
		},
		Since: &since,
		Until: &until,
		Limit: 100,
	}

	clone := original.Clone()

	// Modify original
	original.IDs[0] = "modified"
	original.Kinds[0] = 999
	original.Authors[0] = "modified"
	original.Tags["e"][0] = "modified"
	*original.Since = 0
	*original.Until = 0
	original.Limit = 0

	// Clone should be unchanged
	if clone.IDs[0] != "id1" {
		t.Error("Clone IDs was modified")
	}
	if clone.Kinds[0] != 1 {
		t.Error("Clone Kinds was modified")
	}
	if clone.Authors[0] != "author1" {
		t.Error("Clone Authors was modified")
	}
	if clone.Tags["e"][0] != "event1" {
		t.Error("Clone Tags was modified")
	}
	if *clone.Since != 1704067200 {
		t.Error("Clone Since was modified")
	}
	if *clone.Until != 1704153600 {
		t.Error("Clone Until was modified")
	}
	if clone.Limit != 100 {
		t.Error("Clone Limit was modified")
	}
}

func TestFilterJSONRoundTrip(t *testing.T) {
	since := int64(1704067200)
	original := Filter{
		IDs:     []string{"abc123"},
		Kinds:   []int{1},
		Authors: []string{"def456"},
		Tags: map[string][]string{
			"e": {"event1"},
		},
		Since: &since,
		Limit: 50,
	}

	data, err := json.Marshal(original)
	if err != nil {
		t.Fatalf("Marshal error: %v", err)
	}

	var decoded Filter
	if err := json.Unmarshal(data, &decoded); err != nil {
		t.Fatalf("Unmarshal error: %v", err)
	}

	if len(decoded.IDs) != 1 || decoded.IDs[0] != "abc123" {
		t.Errorf("IDs mismatch")
	}
	if len(decoded.Kinds) != 1 || decoded.Kinds[0] != 1 {
		t.Errorf("Kinds mismatch")
	}
	if len(decoded.Tags["e"]) != 1 || decoded.Tags["e"][0] != "event1" {
		t.Errorf("Tags mismatch")
	}
	if decoded.Since == nil || *decoded.Since != since {
		t.Errorf("Since mismatch")
	}
	if decoded.Limit != 50 {
		t.Errorf("Limit mismatch")
	}
}