package db

import (
	"context"
	"os"
	"path/filepath"
	"testing"
	"time"

	"veola/internal/crypto"
	"veola/internal/models"
)

func newTestStore(t *testing.T) *Store {
	t.Helper()
	dir := t.TempDir()
	conn, err := Open(filepath.Join(dir, "test.db"))
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { conn.Close() })
	key, _ := crypto.DeriveKey([]byte("0123456789abcdef0123456789abcdef-aaa"))
	return NewStore(conn, key)
}

func TestDedupByItemAndURL(t *testing.T) {
	if os.Getenv("CI_SKIP_SQLITE") != "" {
		t.Skip()
	}
	s := newTestStore(t)
	ctx := context.Background()

	id, err := s.CreateItem(ctx, &models.Item{
		Name: "TwinBee", NtfyTopic: "veola", Active: true,
		PollIntervalMinutes: 60, NtfyPriority: "default",
	})
	if err != nil {
		t.Fatal(err)
	}

	r := &models.Result{
		ItemID:   id,
		Title:    "TwinBee Famicom",
		Currency: "USD",
		URL:      "https://example.com/listing/1",
	}
	if _, err := s.InsertResult(ctx, r); err != nil {
		t.Fatal(err)
	}

	exists, err := s.ResultExists(ctx, id, "https://example.com/listing/1")
	if err != nil {
		t.Fatal(err)
	}
	if !exists {
		t.Error("expected result to be detected as duplicate")
	}

	missing, _ := s.ResultExists(ctx, id, "https://example.com/listing/2")
	if missing {
		t.Error("expected unknown URL to not be flagged as duplicate")
	}

	// Different item, same URL should not collide.
	id2, _ := s.CreateItem(ctx, &models.Item{Name: "Other", NtfyTopic: "veola", PollIntervalMinutes: 60, NtfyPriority: "default"})
	other, _ := s.ResultExists(ctx, id2, "https://example.com/listing/1")
	if other {
		t.Error("dedup should be scoped to item_id")
	}

	// Empty URL should not collide.
	emptyExists, _ := s.ResultExists(ctx, id, "")
	if emptyExists {
		t.Error("empty URL should never be flagged as duplicate")
	}
}

func TestDashboardMoneySavedWindow(t *testing.T) {
	if os.Getenv("CI_SKIP_SQLITE") != "" {
		t.Skip()
	}
	s := newTestStore(t)
	ctx := context.Background()

	bp := 100.0
	id, err := s.CreateItem(ctx, &models.Item{
		Name: "Windowed", NtfyTopic: "veola", Active: true,
		PollIntervalMinutes: 60, NtfyPriority: "default",
		BestPrice: &bp,
	})
	if err != nil {
		t.Fatal(err)
	}

	now := time.Now()
	// A stale point well outside the 30-day window at a much higher price. If
	// the average were computed over all history this would inflate "saved".
	if err := s.InsertPricePoint(ctx, &models.PricePoint{
		ItemID: id, Price: 500, PolledAt: now.AddDate(0, 0, -60),
	}); err != nil {
		t.Fatal(err)
	}
	// A recent point inside the window. Best price (100) is below it, so the
	// only legitimate saving is 120 - 100 = 20.
	if err := s.InsertPricePoint(ctx, &models.PricePoint{
		ItemID: id, Price: 120, PolledAt: now.AddDate(0, 0, -5),
	}); err != nil {
		t.Fatal(err)
	}

	stats, err := s.GetDashboardStats(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if stats.SavedItemCount != 1 {
		t.Fatalf("expected 1 saved item, got %d", stats.SavedItemCount)
	}
	if got := stats.MoneySaved; got < 19.99 || got > 20.01 {
		t.Errorf("expected money saved ~20 (recent avg only), got %.2f", got)
	}
}

func TestCJKRoundTrip(t *testing.T) {
	s := newTestStore(t)
	ctx := context.Background()
	id, err := s.CreateItem(ctx, &models.Item{
		Name:        "ツインビー",
		SearchQuery: "ツインビー グラディウス パロディウス",
		NtfyTopic:   "veola",
		Active:      true,
		PollIntervalMinutes: 60, NtfyPriority: "default",
	})
	if err != nil {
		t.Fatal(err)
	}
	got, err := s.GetItem(ctx, id)
	if err != nil {
		t.Fatal(err)
	}
	if got.Name != "ツインビー" || got.SearchQuery != "ツインビー グラディウス パロディウス" {
		t.Errorf("CJK round-trip failed: name=%q query=%q", got.Name, got.SearchQuery)
	}
}