// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package cookiebanner

import (
	"context"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
	"go.gearno.de/kit/pg"
	"go.probo.inc/probo/internal/test"
	"go.probo.inc/probo/pkg/coredata"
	"go.probo.inc/probo/pkg/gid"
	"go.probo.inc/probo/pkg/page"
)

// TestResetBannerTrackers_FullRebuild seeds a banner with an
// uncategorised glob covering two detections, an uncategorised exact
// carrying catalog/vendor links, a categorised exact, and an excluded
// exact. A full reset must: decompose the glob into per-identifier
// exacts and relink its detections, clear links on the surviving
// uncategorised exact and re-arm its mapping, preserve the categorised
// and excluded patterns, and arm pattern analysis on the banner.
func TestResetBannerTrackers_FullRebuild(t *testing.T) {
	t.Parallel()

	client := test.PGClient(t)
	ctx := context.Background()
	fx := seedWorkerFixture(t, ctx, client)

	thirdPartyID := seedThirdParty(t, ctx, client, fx, "Reset Vendor")
	commonPatternID := seedCommonTrackerPattern(t, ctx, client, "ga_linked")

	glob := newGlobInCategory(fx, "_ga_*", fx.uncategorisedID, coredata.CookieSourceScript, nil)

	linkedExact := newExactPattern(fx, "linked_cookie", fx.uncategorisedID, coredata.CookieSourcePreExisting, nil)
	linkedExact.CommonTrackerPatternID = &commonPatternID
	linkedExact.ThirdPartyID = &thirdPartyID
	linkedExact.Description = "stale description"

	categorised := newExactPattern(fx, "categorised_cookie", fx.normalCategoryID, coredata.CookieSourceScript, nil)

	excluded := newExactPattern(fx, "excluded_cookie", fx.uncategorisedID, coredata.CookieSourceScript, nil)
	excluded.Excluded = true

	now := time.Now().UTC().Truncate(time.Microsecond)

	require.NoError(t, client.WithTx(ctx, func(ctx context.Context, tx pg.Tx) error {
		for _, p := range []*coredata.TrackerPattern{glob, linkedExact, categorised, excluded} {
			if err := p.Insert(ctx, tx, fx.scope); err != nil {
				return err
			}
		}

		for _, identifier := range []string{"_ga_ABC", "_ga_DEF"} {
			detection := &coredata.DetectedTracker{
				ID:               gid.New(fx.scope.GetTenantID(), coredata.DetectedTrackerEntityType),
				CookieBannerID:   fx.banner.ID,
				TrackerPatternID: &glob.ID,
				TrackerType:      coredata.TrackerTypeCookie,
				Identifier:       identifier,
				Source:           new(coredata.CookieSourceScript),
				LastDetectedAt:   now,
				CreatedAt:        now,
				UpdatedAt:        now,
			}

			if _, err := detection.Upsert(ctx, tx, fx.scope); err != nil {
				return err
			}
		}

		return nil
	}))

	result, err := ResetBannerTrackers(ctx, client, fx.scope, fx.banner.ID, false, nil)
	require.NoError(t, err)

	require.Equal(t, 1, result.GlobsDecomposed)
	require.Equal(t, 2, result.ExactsCreated)
	require.Equal(t, 2, result.DetectionsRelinked)
	require.True(t, result.AnalysisRequested)
	// linked_cookie + _ga_ABC + _ga_DEF (excluded and categorised are untouched).
	require.Equal(t, int64(3), result.PatternsReset)

	require.NoError(t, client.WithConn(ctx, func(ctx context.Context, conn pg.Querier) error {
		// The glob is gone.
		var goneGlob coredata.TrackerPattern

		err := goneGlob.LoadByBannerIDTypeAndPattern(ctx, conn, fx.scope, fx.banner.ID, coredata.TrackerTypeCookie, "_ga_*", nil)
		require.ErrorIs(t, err, coredata.ErrResourceNotFound)

		// Each detection identifier is now its own exact, with mapping armed
		// and no links, and the detection relinked to it.
		for _, identifier := range []string{"_ga_ABC", "_ga_DEF"} {
			var exact coredata.TrackerPattern
			require.NoError(t, exact.LoadByBannerIDTypeAndPattern(ctx, conn, fx.scope, fx.banner.ID, coredata.TrackerTypeCookie, identifier, nil))
			require.Equal(t, coredata.TrackerPatternMatchTypeExact, exact.MatchType)
			require.Equal(t, fx.uncategorisedID, exact.CookieCategoryID)
			require.Nil(t, exact.CommonTrackerPatternID)
			require.Nil(t, exact.ThirdPartyID)
			require.NotNil(t, exact.MappingRequestedAt)

			detections, err := page.LoadAll(
				ctx,
				page.OrderBy[coredata.DetectedTrackerOrderField]{
					Field:     coredata.DetectedTrackerOrderFieldLastDetectedAt,
					Direction: page.OrderDirectionAsc,
				},
				func(ctx context.Context, cursor *page.Cursor[coredata.DetectedTrackerOrderField]) ([]*coredata.DetectedTracker, error) {
					var batch coredata.DetectedTrackers
					if err := batch.LoadByTrackerPatternID(ctx, conn, fx.scope, exact.ID, cursor); err != nil {
						return nil, err
					}

					return batch, nil
				},
			)
			require.NoError(t, err)
			require.Len(t, detections, 1)
			require.Equal(t, identifier, detections[0].Identifier)
		}

		// The surviving uncategorised exact had its links and copied
		// description cleared and mapping re-armed.
		var survivor coredata.TrackerPattern
		require.NoError(t, survivor.LoadByBannerIDTypeAndPattern(ctx, conn, fx.scope, fx.banner.ID, coredata.TrackerTypeCookie, "linked_cookie", nil))
		require.Nil(t, survivor.CommonTrackerPatternID)
		require.Nil(t, survivor.ThirdPartyID)
		require.Empty(t, survivor.Description)
		require.NotNil(t, survivor.MappingRequestedAt)

		// The categorised pattern is untouched.
		var categorisedRow coredata.TrackerPattern
		require.NoError(t, categorisedRow.LoadByBannerIDTypeAndPattern(ctx, conn, fx.scope, fx.banner.ID, coredata.TrackerTypeCookie, "categorised_cookie", nil))
		require.Equal(t, fx.normalCategoryID, categorisedRow.CookieCategoryID)

		// The excluded pattern is preserved.
		var excludedRow coredata.TrackerPattern
		require.NoError(t, excludedRow.LoadByBannerIDTypeAndPattern(ctx, conn, fx.scope, fx.banner.ID, coredata.TrackerTypeCookie, "excluded_cookie", nil))
		require.True(t, excludedRow.Excluded)

		// Pattern analysis is armed on the banner.
		var banner coredata.CookieBanner
		require.NoError(t, banner.LoadByID(ctx, conn, fx.scope, fx.banner.ID))
		require.NotNil(t, banner.PatternAnalysisRequestedAt)

		return nil
	}))
}

func seedCommonTrackerPattern(t *testing.T, ctx context.Context, client *pg.Client, pattern string) gid.GID {
	t.Helper()

	now := time.Now().UTC().Truncate(time.Microsecond)
	cp := coredata.CommonTrackerPattern{
		ID:          gid.New(gid.NilTenant, coredata.CommonTrackerPatternEntityType),
		TrackerType: coredata.TrackerTypeCookie,
		Pattern:     pattern,
		MatchType:   coredata.TrackerPatternMatchTypeExact,
		Description: "seeded",
		Confidence:  1,
		CreatedAt:   now,
		UpdatedAt:   now,
	}

	require.NoError(t, client.WithTx(ctx, func(ctx context.Context, tx pg.Tx) error {
		return cp.Insert(ctx, tx)
	}))

	t.Cleanup(func() {
		_ = client.WithTx(context.Background(), func(ctx context.Context, tx pg.Tx) error {
			_, err := tx.Exec(ctx, `DELETE FROM common_tracker_patterns WHERE id = $1`, cp.ID)
			return err
		})
	})

	return cp.ID
}