package database

import (
	"database/sql"
	"testing"
)

// insertTestRelease inserts a minimal external_releases row for use in tests that need FK satisfaction.
func insertTestRelease(db *DB, rgid, artistID string) error {
	_, err := db.Conn().Exec(
		"INSERT OR IGNORE INTO external_releases (rgid, artist_id, title) VALUES (?, ?, ?)",
		rgid, artistID, "Test Release "+rgid,
	)
	return err
}

// TestMarkNotificationSent_New verifies inserting a new notification record.
func TestMarkNotificationSent_New(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist: %v", err)
	}
	if err := insertTestRelease(db, "rgid-1", "artist-1"); err != nil {
		t.Fatalf("insertTestRelease: %v", err)
	}
	if err := MarkNotificationSent(db, "rgid-1"); err != nil {
		t.Fatalf("MarkNotificationSent() error: %v", err)
	}

	sentAt, err := GetNotificationSentAt(db, "rgid-1")
	if err != nil {
		t.Fatalf("GetNotificationSentAt() error: %v", err)
	}
	if sentAt == "" {
		t.Error("expected sent_at to be non-empty")
	}
}

// TestMarkNotificationSent_DuplicateSecond verifies that inserting the same RGID twice
// within the same second fails due to the composite primary key (rgid, sent_at).
// In practice, notifications are sent at most once per day, so this is acceptable.
func TestMarkNotificationSent_DuplicateSecond(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist: %v", err)
	}
	if err := insertTestRelease(db, "rgid-1", "artist-1"); err != nil {
		t.Fatalf("insertTestRelease: %v", err)
	}
	if err := MarkNotificationSent(db, "rgid-1"); err != nil {
		t.Fatalf("first MarkNotificationSent() error: %v", err)
	}
	// Second insert in the same second should fail with a UNIQUE constraint error.
	err = MarkNotificationSent(db, "rgid-1")
	if err == nil {
		t.Fatal("expected UNIQUE constraint error on duplicate insert, got nil")
	}

	// Should still have exactly one row.
	var count int
	err = db.Conn().QueryRow("SELECT COUNT(*) FROM notifications_sent WHERE rgid = ?", "rgid-1").Scan(&count)
	if err != nil {
		t.Fatalf("count query error: %v", err)
	}
	if count != 1 {
		t.Errorf("expected 1 notification row, got %d", count)
	}
}

// TestMarkNotificationSent_DifferentTime verifies that inserting the same RGID at a
// different explicit sent_at time succeeds (composite PK allows multiple rows per RGID).
func TestMarkNotificationSent_DifferentTime(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist: %v", err)
	}
	if err := insertTestRelease(db, "rgid-1", "artist-1"); err != nil {
		t.Fatalf("insertTestRelease: %v", err)
	}

	// Insert with explicit different timestamps.
	_, err = db.Conn().Exec("INSERT INTO notifications_sent (rgid, sent_at) VALUES (?, ?)", "rgid-1", "2024-01-01T00:00:00Z")
	if err != nil {
		t.Fatalf("first insert error: %v", err)
	}
	_, err = db.Conn().Exec("INSERT INTO notifications_sent (rgid, sent_at) VALUES (?, ?)", "rgid-1", "2024-06-01T00:00:00Z")
	if err != nil {
		t.Fatalf("second insert error: %v", err)
	}

	// IsNotificationSent should return true.
	sent, err := IsNotificationSent(db, "rgid-1")
	if err != nil {
		t.Fatalf("IsNotificationSent() error: %v", err)
	}
	if !sent {
		t.Error("expected IsNotificationSent to return true")
	}

	// Should have two rows.
	var count int
	err = db.Conn().QueryRow("SELECT COUNT(*) FROM notifications_sent WHERE rgid = ?", "rgid-1").Scan(&count)
	if err != nil {
		t.Fatalf("count query error: %v", err)
	}
	if count != 2 {
		t.Errorf("expected 2 notification rows, got %d", count)
	}
}

// TestIsNotificationSent_True verifies true for a sent notification.
func TestIsNotificationSent_True(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist: %v", err)
	}
	if err := insertTestRelease(db, "rgid-1", "artist-1"); err != nil {
		t.Fatalf("insertTestRelease: %v", err)
	}
	if err := MarkNotificationSent(db, "rgid-1"); err != nil {
		t.Fatalf("MarkNotificationSent() error: %v", err)
	}

	sent, err := IsNotificationSent(db, "rgid-1")
	if err != nil {
		t.Fatalf("IsNotificationSent() error: %v", err)
	}
	if !sent {
		t.Error("expected IsNotificationSent to return true")
	}
}

// TestIsNotificationSent_False verifies false for an unsent RGID.
func TestIsNotificationSent_False(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	sent, err := IsNotificationSent(db, "nonexistent")
	if err != nil {
		t.Fatalf("IsNotificationSent() error: %v", err)
	}
	if sent {
		t.Error("expected IsNotificationSent to return false for nonexistent RGID")
	}
}

// TestGetNotificationSentAt_NotFound verifies sql.ErrNoRows for unsent RGID.
func TestGetNotificationSentAt_NotFound(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	_, err = GetNotificationSentAt(db, "nonexistent")
	if err != sql.ErrNoRows {
		t.Errorf("expected sql.ErrNoRows, got %v", err)
	}
}

// TestGetUnnotifiedReleases_AllUnnotified verifies all releases returned when no notifications sent.
func TestGetUnnotifiedReleases_AllUnnotified(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	releases := []ExternalRelease{
		{RGID: "rg1", ArtistID: "artist-1", Title: "Album 1", Type: "album", ReleaseDate: "2024-01-01"},
		{RGID: "rg2", ArtistID: "artist-1", Title: "Album 2", Type: "album", ReleaseDate: "2024-06-01"},
		{RGID: "rg3", ArtistID: "artist-2", Title: "Single 1", Type: "single", ReleaseDate: "2024-03-01"},
	}

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist(artist-1): %v", err)
	}
	if err := insertTestArtist(db, "artist-2"); err != nil {
		t.Fatalf("insertTestArtist(artist-2): %v", err)
	}
	for _, r := range releases {
		if err := SaveExternalRelease(db, &r); err != nil {
			t.Fatalf("SaveExternalRelease(%s) error: %v", r.RGID, err)
		}
	}

	results, err := GetUnnotifiedReleases(db)
	if err != nil {
		t.Fatalf("GetUnnotifiedReleases() error: %v", err)
	}
	if len(results) != 3 {
		t.Fatalf("expected 3 unnotified releases, got %d", len(results))
	}
}

// TestGetUnnotifiedReleases_SomeNotified verifies only unnotified releases are returned.
func TestGetUnnotifiedReleases_SomeNotified(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	releases := []ExternalRelease{
		{RGID: "rg1", ArtistID: "artist-1", Title: "Album 1", Type: "album", ReleaseDate: "2024-01-01"},
		{RGID: "rg2", ArtistID: "artist-1", Title: "Album 2", Type: "album", ReleaseDate: "2024-06-01"},
		{RGID: "rg3", ArtistID: "artist-2", Title: "Single 1", Type: "single", ReleaseDate: "2024-03-01"},
	}

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist(artist-1): %v", err)
	}
	if err := insertTestArtist(db, "artist-2"); err != nil {
		t.Fatalf("insertTestArtist(artist-2): %v", err)
	}
	for _, r := range releases {
		if err := SaveExternalRelease(db, &r); err != nil {
			t.Fatalf("SaveExternalRelease(%s) error: %v", r.RGID, err)
		}
	}

	// Mark rg1 and rg3 as notified.
	if err := MarkNotificationSent(db, "rg1"); err != nil {
		t.Fatalf("MarkNotificationSent(rg1) error: %v", err)
	}
	if err := MarkNotificationSent(db, "rg3"); err != nil {
		t.Fatalf("MarkNotificationSent(rg3) error: %v", err)
	}

	results, err := GetUnnotifiedReleases(db)
	if err != nil {
		t.Fatalf("GetUnnotifiedReleases() error: %v", err)
	}
	if len(results) != 1 {
		t.Fatalf("expected 1 unnotified release, got %d", len(results))
	}
	if results[0].RGID != "rg2" {
		t.Errorf("expected unnotified release rg2, got %s", results[0].RGID)
	}
	if results[0].Title != "Album 2" {
		t.Errorf("expected Title 'Album 2', got %q", results[0].Title)
	}
}

// TestGetUnnotifiedReleases_AllNotified verifies empty result when all releases are notified.
func TestGetUnnotifiedReleases_AllNotified(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	releases := []ExternalRelease{
		{RGID: "rg1", ArtistID: "artist-1", Title: "Album 1"},
		{RGID: "rg2", ArtistID: "artist-1", Title: "Album 2"},
	}

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist(artist-1): %v", err)
	}
	for _, r := range releases {
		if err := SaveExternalRelease(db, &r); err != nil {
			t.Fatalf("SaveExternalRelease(%s) error: %v", r.RGID, err)
		}
	}

	// Mark all as notified.
	for _, r := range releases {
		if err := MarkNotificationSent(db, r.RGID); err != nil {
			t.Fatalf("MarkNotificationSent(%s) error: %v", r.RGID, err)
		}
	}

	results, err := GetUnnotifiedReleases(db)
	if err != nil {
		t.Fatalf("GetUnnotifiedReleases() error: %v", err)
	}
	if len(results) != 0 {
		t.Errorf("expected 0 unnotified releases, got %d", len(results))
	}
}

// TestGetUnnotifiedReleases_NoReleases verifies empty result when no releases exist.
func TestGetUnnotifiedReleases_NoReleases(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	results, err := GetUnnotifiedReleases(db)
	if err != nil {
		t.Fatalf("GetUnnotifiedReleases() error: %v", err)
	}
	if len(results) != 0 {
		t.Errorf("expected 0 unnotified releases, got %d", len(results))
	}
}

// TestMarkNotificationSent_MultipleReleases verifies marking multiple different RGIDs.
func TestMarkNotificationSent_MultipleReleases(t *testing.T) {
	db, err := New(":memory:")
	if err != nil {
		t.Fatalf("New() error: %v", err)
	}
	defer db.Close()

	if err := insertTestArtist(db, "artist-1"); err != nil {
		t.Fatalf("insertTestArtist: %v", err)
	}
	for _, rgid := range []string{"rg1", "rg2", "rg3"} {
		if err := insertTestRelease(db, rgid, "artist-1"); err != nil {
			t.Fatalf("insertTestRelease(%s): %v", rgid, err)
		}
	}

	rgids := []string{"rg1", "rg2", "rg3"}
	for _, rgid := range rgids {
		if err := MarkNotificationSent(db, rgid); err != nil {
			t.Fatalf("MarkNotificationSent(%s) error: %v", rgid, err)
		}
	}

	for _, rgid := range rgids {
		sent, err := IsNotificationSent(db, rgid)
		if err != nil {
			t.Fatalf("IsNotificationSent(%s) error: %v", rgid, err)
		}
		if !sent {
			t.Errorf("expected IsNotificationSent(%s) to return true", rgid)
		}
	}

	// Verify count.
	var count int
	err = db.Conn().QueryRow("SELECT COUNT(*) FROM notifications_sent").Scan(&count)
	if err != nil {
		t.Fatalf("count query error: %v", err)
	}
	if count != 3 {
		t.Errorf("expected 3 notification rows, got %d", count)
	}
}