package store

import (
	"context"
	"path/filepath"
	"testing"
)

func openTestDB(t *testing.T) *DB {
	t.Helper()
	path := filepath.Join(t.TempDir(), "smartrun_test.db")
	db, err := Open(path)
	if err != nil {
		t.Fatalf("Open: %v", err)
	}
	t.Cleanup(func() { db.Close() })
	return db
}

func f(v float64) *float64 { return &v }

func TestMigrateIsIdempotent(t *testing.T) {
	path := filepath.Join(t.TempDir(), "smartrun_test.db")
	db1, err := Open(path)
	if err != nil {
		t.Fatalf("first Open: %v", err)
	}
	db1.Close()

	db2, err := Open(path)
	if err != nil {
		t.Fatalf("second Open (re-applying migrations): %v", err)
	}
	db2.Close()
}

func TestUpsertActivity_InsertThenUpdateIsIdempotent(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	a := Activity{
		GarminActivityID: 23554066504,
		ActivityName:     "Auriol - W2-5-Base Endurance",
		ActivityType:     "running",
		StartTimeUTC:     "2026-07-11 05:02:35",
		BeginTimestampMs: 1783746155000,
		DurationSeconds:  1800,
		DistanceMeters:   6858,
		AvgHR:            f(148),
		RawJSON:          `{"activityId":23554066504}`,
	}

	id, err := db.UpsertActivity(ctx, a)
	if err != nil {
		t.Fatalf("UpsertActivity (insert): %v", err)
	}

	a.AvgHR = f(150) // simulate a re-sync with a corrected value
	id2, err := db.UpsertActivity(ctx, a)
	if err != nil {
		t.Fatalf("UpsertActivity (update): %v", err)
	}
	if id != id2 {
		t.Fatalf("expected same internal id across upserts, got %d then %d", id, id2)
	}

	got, ok, err := db.GetActivity(ctx, id)
	if err != nil || !ok {
		t.Fatalf("GetActivity: ok=%v err=%v", ok, err)
	}
	if *got.AvgHR != 150 {
		t.Errorf("AvgHR = %v, want 150 (update should have applied)", *got.AvgHR)
	}

	all, err := db.ListActivities(ctx, ActivityFilter{})
	if err != nil {
		t.Fatalf("ListActivities: %v", err)
	}
	if len(all) != 1 {
		t.Fatalf("expected exactly 1 activity after upsert-update, got %d", len(all))
	}
}

func TestKindAssignment_AppendOnlyHistoryAndCurrentView(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	activityID, err := db.UpsertActivity(ctx, Activity{
		GarminActivityID: 1,
		ActivityType:     "running",
		StartTimeUTC:     "2026-07-11 05:00:00",
		RawJSON:          "{}",
	})
	if err != nil {
		t.Fatalf("UpsertActivity: %v", err)
	}

	kindID, err := db.CreateWorkoutKind(ctx, WorkoutKind{
		Name:     "Tempo",
		RuleJSON: `{"match":"all","conditions":[]}`,
		IsActive: true,
	})
	if err != nil {
		t.Fatalf("CreateWorkoutKind: %v", err)
	}

	// First: rule engine says needs_review (ambiguous).
	if _, err := db.InsertKindAssignment(ctx, KindAssignment{
		ActivityID:         activityID,
		AssignmentSource:   AssignmentSourceRuleEngine,
		Status:             AssignmentStatusNeedsReview,
		CandidateKindsJSON: `[{"kind_id":1,"score":0.5}]`,
	}); err != nil {
		t.Fatalf("InsertKindAssignment (rule engine): %v", err)
	}

	queue, err := db.ReviewQueue(ctx)
	if err != nil {
		t.Fatalf("ReviewQueue: %v", err)
	}
	if len(queue) != 1 {
		t.Fatalf("expected 1 item in review queue, got %d", len(queue))
	}

	// Then: user manually resolves it.
	if _, err := db.InsertKindAssignment(ctx, KindAssignment{
		ActivityID:       activityID,
		WorkoutKindID:    &kindID,
		AssignmentSource: AssignmentSourceManual,
		Status:           AssignmentStatusAssigned,
	}); err != nil {
		t.Fatalf("InsertKindAssignment (manual): %v", err)
	}

	queue, err = db.ReviewQueue(ctx)
	if err != nil {
		t.Fatalf("ReviewQueue after resolve: %v", err)
	}
	if len(queue) != 0 {
		t.Fatalf("expected 0 items in review queue after manual resolve, got %d", len(queue))
	}

	current, ok, err := db.CurrentAssignment(ctx, activityID)
	if err != nil || !ok {
		t.Fatalf("CurrentAssignment: ok=%v err=%v", ok, err)
	}
	if current.AssignmentSource != AssignmentSourceManual || current.Status != AssignmentStatusAssigned {
		t.Errorf("current assignment = %+v, want manual/assigned", current)
	}

	// The original rule-engine assignment must still exist (append-only history).
	var historyCount int
	if err := db.QueryRowContext(ctx, `SELECT COUNT(*) FROM kind_assignments WHERE activity_id = ?`, activityID).Scan(&historyCount); err != nil {
		t.Fatalf("count history: %v", err)
	}
	if historyCount != 2 {
		t.Errorf("expected 2 historical assignment rows (rule engine + manual), got %d", historyCount)
	}

	forKind, err := db.AssignmentsForKind(ctx, kindID)
	if err != nil {
		t.Fatalf("AssignmentsForKind: %v", err)
	}
	if len(forKind) != 1 {
		t.Fatalf("expected 1 assigned activity for kind %d, got %d", kindID, len(forKind))
	}
}

func TestReplaceLapsIsIdempotent(t *testing.T) {
	db := openTestDB(t)
	ctx := context.Background()

	activityID, err := db.UpsertActivity(ctx, Activity{
		GarminActivityID: 2,
		ActivityType:     "running",
		StartTimeUTC:     "2026-07-11 05:00:00",
		RawJSON:          "{}",
	})
	if err != nil {
		t.Fatalf("UpsertActivity: %v", err)
	}

	laps := []Lap{
		{LapIndex: 1, StartTimeUTC: "2026-07-11 05:00:00", DurationSeconds: 300, DistanceMeters: 1000, AvgHR: f(140), RawJSON: "{}"},
		{LapIndex: 2, StartTimeUTC: "2026-07-11 05:05:00", DurationSeconds: 300, DistanceMeters: 1000, AvgHR: f(150), RawJSON: "{}"},
	}
	if err := db.ReplaceLaps(ctx, activityID, laps); err != nil {
		t.Fatalf("ReplaceLaps (first): %v", err)
	}
	// Re-sync with a different set (e.g. corrected data) should fully replace, not append.
	if err := db.ReplaceLaps(ctx, activityID, laps[:1]); err != nil {
		t.Fatalf("ReplaceLaps (second): %v", err)
	}

	got, err := db.LapsForActivity(ctx, activityID)
	if err != nil {
		t.Fatalf("LapsForActivity: %v", err)
	}
	if len(got) != 1 {
		t.Fatalf("expected 1 lap after replace, got %d", len(got))
	}
}