package store

import (
	"context"
	"testing"
)

// TestIsolation_ProfileNeverLeaksAcrossUsers confirms GetProfile only ever
// returns the row matching the given userID, and that two users' profiles
// can diverge independently.
func TestIsolation_ProfileNeverLeaksAcrossUsers(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	profileA, err := db.GetProfile(ctx, userA)
	if err != nil {
		t.Fatalf("GetProfile(a): %v", err)
	}
	profileA.GarminEmail = "a@example.com"
	if err := db.UpdateProfile(ctx, userA, profileA); err != nil {
		t.Fatalf("UpdateProfile(a): %v", err)
	}

	profileB, err := db.GetProfile(ctx, userB)
	if err != nil {
		t.Fatalf("GetProfile(b): %v", err)
	}
	if profileB.GarminEmail == "a@example.com" {
		t.Fatal("userB's profile picked up userA's GarminEmail update")
	}

	// Attempting to update B's profile "as A" (i.e. calling UpdateProfile
	// with userA but a struct that happens to describe B's desired state)
	// only ever touches the row WHERE user_id = userA -- confirm B is
	// unaffected by any such call.
	if err := db.UpdateProfile(ctx, userA, Profile{GarminEmail: "still-a-only@example.com"}); err != nil {
		t.Fatalf("UpdateProfile(a) second call: %v", err)
	}
	profileB2, err := db.GetProfile(ctx, userB)
	if err != nil {
		t.Fatalf("GetProfile(b) after A's update: %v", err)
	}
	if profileB2.GarminEmail == "still-a-only@example.com" {
		t.Fatal("userA's UpdateProfile call leaked into userB's row")
	}
}

// TestIsolation_WorkoutKindsAndPacesNeverLeakAcrossUsers confirms
// GetWorkoutKind/GetWorkoutTypePace return not-found for a kind id that
// exists but belongs to a different user, and that UpdateWorkoutKind /
// UpdateWorkoutTypePace can never mutate another user's row even if handed
// that row's real id.
func TestIsolation_WorkoutKindsAndPacesNeverLeakAcrossUsers(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	kindsA, err := db.ListWorkoutKinds(ctx, userA, false)
	if err != nil || len(kindsA) == 0 {
		t.Fatalf("ListWorkoutKinds(a): len=%d err=%v", len(kindsA), err)
	}
	targetKindID := kindsA[0].ID

	if _, found, err := db.GetWorkoutKind(ctx, userB, targetKindID); err != nil || found {
		t.Fatalf("expected userB not to see userA's kind %d, found=%v err=%v", targetKindID, found, err)
	}

	// Attempt to update A's kind "as B" -- must silently affect zero rows,
	// not A's real row.
	if err := db.UpdateWorkoutKind(ctx, userB, WorkoutKind{ID: targetKindID, Name: "Hijacked", RuleJSON: "{}"}); err != nil {
		t.Fatalf("UpdateWorkoutKind(as b): %v", err)
	}
	stillA, found, err := db.GetWorkoutKind(ctx, userA, targetKindID)
	if err != nil || !found {
		t.Fatalf("GetWorkoutKind(a) after B's attempted update: found=%v err=%v", found, err)
	}
	if stillA.Name == "Hijacked" {
		t.Fatal("userB's UpdateWorkoutKind call was able to mutate userA's kind")
	}

	if _, err := db.GetWorkoutTypePace(ctx, userB, targetKindID); err != nil {
		t.Fatalf("GetWorkoutTypePace(as b) should return a zero-value pace, not an error, got: %v", err)
	}
	minPace := 300.0
	if err := db.UpdateWorkoutTypePace(ctx, userB, WorkoutTypePace{WorkoutKindID: targetKindID, PaceMinSecPerKm: &minPace}); err != nil {
		t.Fatalf("UpdateWorkoutTypePace(as b): %v", err)
	}
	paceA, err := db.GetWorkoutTypePace(ctx, userA, targetKindID)
	if err != nil {
		t.Fatalf("GetWorkoutTypePace(a): %v", err)
	}
	if paceA.PaceMinSecPerKm != nil {
		t.Fatal("userB's UpdateWorkoutTypePace call was able to mutate userA's pace row")
	}
}

// TestIsolation_SyncStateAndRunsNeverLeakAcrossUsers confirms each user's
// backfill watermark and sync run history are independent.
func TestIsolation_SyncStateAndRunsNeverLeakAcrossUsers(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	if err := db.UpdateSyncState(ctx, userA, "2020-01-01", true); err != nil {
		t.Fatalf("UpdateSyncState(a): %v", err)
	}
	stateB, err := db.GetSyncState(ctx, userB)
	if err != nil {
		t.Fatalf("GetSyncState(b): %v", err)
	}
	if stateB.BackfillComplete || stateB.EarliestSyncedDate != nil {
		t.Fatalf("userA's UpdateSyncState leaked into userB's sync_state: %+v", stateB)
	}

	runID, err := db.StartSyncRun(ctx, userA, SyncKindFull)
	if err != nil {
		t.Fatalf("StartSyncRun(a): %v", err)
	}
	runsB, err := db.ListSyncRuns(ctx, userB, 10)
	if err != nil {
		t.Fatalf("ListSyncRuns(b): %v", err)
	}
	if len(runsB) != 0 {
		t.Fatalf("expected userB to have 0 sync runs, got %d (userA's run id=%d)", len(runsB), runID)
	}

	// Finishing A's run "as B" must not succeed against A's row.
	if err := db.FinishSyncRun(ctx, userB, runID, 5, nil); err != nil {
		t.Fatalf("FinishSyncRun(as b): %v", err)
	}
	latestA, found, err := db.LatestSyncRun(ctx, userA)
	if err != nil || !found {
		t.Fatalf("LatestSyncRun(a): found=%v err=%v", found, err)
	}
	if latestA.Status == SyncStatusSuccess {
		t.Fatal("userB's FinishSyncRun call was able to mutate userA's sync run")
	}
}

// TestIsolation_DeleteUserLeavesOtherUsersDataIntact confirms deleting one
// user's account never touches another user's profile, taxonomy, or
// activities, even though DeleteUser is a single blunt DELETE FROM users.
func TestIsolation_DeleteUserLeavesOtherUsersDataIntact(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}
	if _, err := db.UpsertActivity(ctx, userB, Activity{GarminActivityID: 1, StartTimeUTC: "2026-07-11 06:00:00", RawJSON: "{}"}); err != nil {
		t.Fatalf("UpsertActivity(b): %v", err)
	}

	if err := db.DeleteUser(ctx, userA); err != nil {
		t.Fatalf("DeleteUser(a): %v", err)
	}

	if _, found, err := db.GetUserBySub(ctx, "sub-b"); err != nil || !found {
		t.Fatalf("expected userB to survive userA's deletion, found=%v err=%v", found, err)
	}
	profileB, err := db.GetProfile(ctx, userB)
	if err != nil {
		t.Fatalf("GetProfile(b) after deleting a: %v", err)
	}
	if profileB.Name != "B" {
		t.Errorf("userB's profile changed after deleting userA: %+v", profileB)
	}
	kindsB, err := db.ListWorkoutKinds(ctx, userB, false)
	if err != nil || len(kindsB) != 8 {
		t.Fatalf("userB's taxonomy affected by deleting userA: len=%d err=%v", len(kindsB), err)
	}
	activitiesB, err := db.ListActivities(ctx, userB, ActivityFilter{})
	if err != nil || len(activitiesB) != 1 {
		t.Fatalf("userB's activities affected by deleting userA: len=%d err=%v", len(activitiesB), err)
	}
}

// TestIsolation_ActivitiesMissingWorkoutNeverLeaksAcrossUsers confirms
// ActivitiesMissingWorkout/CountActivitiesMissingWorkout only ever surface
// userID's own pending-workout activities, never another user's, even
// though both users have activities in the exact shape (workout_id set,
// details fetched, workout_raw_json still NULL) the query selects for.
func TestIsolation_ActivitiesMissingWorkoutNeverLeaksAcrossUsers(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	workoutID := int64(999)
	idA, err := db.UpsertActivity(ctx, userA, Activity{
		GarminActivityID: 1, WorkoutID: &workoutID,
		StartTimeUTC: "2026-07-01 06:00:00", RawJSON: "{}",
	})
	if err != nil {
		t.Fatalf("UpsertActivity(a): %v", err)
	}
	if err := db.SetActivityDetails(ctx, userA, idA, "{}"); err != nil {
		t.Fatalf("SetActivityDetails(a): %v", err)
	}

	idB, err := db.UpsertActivity(ctx, userB, Activity{
		GarminActivityID: 1, WorkoutID: &workoutID,
		StartTimeUTC: "2026-07-01 06:00:00", RawJSON: "{}",
	})
	if err != nil {
		t.Fatalf("UpsertActivity(b): %v", err)
	}
	if err := db.SetActivityDetails(ctx, userB, idB, "{}"); err != nil {
		t.Fatalf("SetActivityDetails(b): %v", err)
	}

	pendingA, err := db.ActivitiesMissingWorkout(ctx, userA, 10)
	if err != nil {
		t.Fatalf("ActivitiesMissingWorkout(a): %v", err)
	}
	if len(pendingA) != 1 || pendingA[0].ID != idA {
		t.Fatalf("ActivitiesMissingWorkout(a) = %+v, want only userA's own activity (id %d)", pendingA, idA)
	}

	countA, err := db.CountActivitiesMissingWorkout(ctx, userA)
	if err != nil {
		t.Fatalf("CountActivitiesMissingWorkout(a): %v", err)
	}
	if countA != 1 {
		t.Fatalf("CountActivitiesMissingWorkout(a) = %d, want 1 (userB's identical-looking activity must not be counted)", countA)
	}

	// Resolving userA's workout must not affect userB's pending activity.
	if err := db.SetActivityWorkout(ctx, userA, idA, `{"segments":[]}`); err != nil {
		t.Fatalf("SetActivityWorkout(a): %v", err)
	}
	pendingB, err := db.ActivitiesMissingWorkout(ctx, userB, 10)
	if err != nil {
		t.Fatalf("ActivitiesMissingWorkout(b): %v", err)
	}
	if len(pendingB) != 1 || pendingB[0].ID != idB {
		t.Fatalf("ActivitiesMissingWorkout(b) = %+v, want userB's activity unaffected by userA's SetActivityWorkout", pendingB)
	}
	countB, err := db.CountActivitiesMissingWorkout(ctx, userB)
	if err != nil {
		t.Fatalf("CountActivitiesMissingWorkout(b): %v", err)
	}
	if countB != 1 {
		t.Fatalf("CountActivitiesMissingWorkout(b) = %d, want 1 (unaffected by userA's SetActivityWorkout call)", countB)
	}
}

// TestIsolation_MarkGarminConnectedNeverLeaksAcrossUsers confirms marking
// one user's Garmin connection never sets another user's flag.
func TestIsolation_MarkGarminConnectedNeverLeaksAcrossUsers(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	userA, err := db.ProvisionUser(ctx, "sub-a", "A")
	if err != nil {
		t.Fatalf("ProvisionUser(a): %v", err)
	}
	userB, err := db.ProvisionUser(ctx, "sub-b", "B")
	if err != nil {
		t.Fatalf("ProvisionUser(b): %v", err)
	}

	if err := db.MarkGarminConnected(ctx, userA); err != nil {
		t.Fatalf("MarkGarminConnected(a): %v", err)
	}

	profileB, err := db.GetProfile(ctx, userB)
	if err != nil {
		t.Fatalf("GetProfile(b): %v", err)
	}
	if profileB.GarminConnectedAt != nil {
		t.Fatal("userA's MarkGarminConnected call leaked into userB's profile")
	}
}