package reports_test

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"ruben/inventory2/consts"
	"ruben/inventory2/domains/accounts"
	"ruben/inventory2/domains/reports"
	"ruben/inventory2/internal/testdb"
)

// createEtsyListing creates a listing with the given base count in shopID
// and registers its cleanup. Must be called after setupEtsyMockShop, so
// cleanup order (LIFO) deletes the listing before the shop it belongs to.
func createEtsyListing(t *testing.T, acctStore *accounts.Store, acctID int64, shopID string, baseCount int64) (listingID string) {
	t.Helper()
	ctx := context.Background()

	pool := testdb.Pool(t)

	listing, err := acctStore.CreateMockListing(ctx, accounts.MockListing{
		AccountShopListingIDs: accounts.AccountShopListingIDs{
			AccountShopIDs: accounts.AccountShopIDs{
				AccountIDs: accounts.AccountIDs{AccountID: acctID},
				Platform:   accounts.Etsy,
				ShopID:     shopID,
			},
		},
		SKU:         "test-sku",
		Name:        "Test Listing",
		Description: "a listing created for a test",
		Count:       baseCount,
	})
	require.NoError(t, err, "CreateMockListing()")

	t.Cleanup(func() {
		pool.Exec(context.Background(), `
			DELETE FROM mock.shop_etsy_listings WHERE shop_id = $1 AND listing_id = $2
		`, shopID, listing.ListingID)
	})

	return listing.ListingID
}

// TestGetListingCountsOverTime exercises the actual running-count logic,
// which lives in a recursive SQL view (mock.shop_etsy_listing_counts,
// built on mock.shop_etsy_listing_event_sequence) rather than in Go: it
// starts from the listing's base count and walks mock.raw_shop_events in
// order, applying each as a delta (sale/refund) or an absolute reset
// (inventory-reset). Uses the real SaveNewMock* methods to write those
// events, the same entry points the simulate-sale/refund/inventory UI
// uses, rather than hand-rolling the JSON payload shape.
func TestGetListingCountsOverTime(t *testing.T) {
	pool := testdb.Pool(t)
	acctStore := accounts.NewStore(testdb.Logger(), pool)
	reportsStore := reports.NewStore(testdb.Logger(), pool, acctStore)
	ctx := context.Background()

	acctID, shopID := setupEtsyMockShop(t, pool, acctStore)
	listingID := createEtsyListing(t, acctStore, acctID, shopID, 100)

	_, err := acctStore.SaveNewMockSale(ctx, acctID, accounts.Etsy, shopID, listingID, 10)
	require.NoError(t, err, "SaveNewMockSale()")
	_, err = acctStore.SaveNewMockRefund(ctx, acctID, accounts.Etsy, shopID, listingID, 5)
	require.NoError(t, err, "SaveNewMockRefund()")
	_, err = acctStore.SaveNewMockInventoryReset(ctx, acctID, accounts.Etsy, shopID, listingID, 50)
	require.NoError(t, err, "SaveNewMockInventoryReset()")

	got, err := reportsStore.GetListingCountsOverTime(ctx, acctID, accounts.Etsy, shopID, listingID)
	require.NoError(t, err, "GetListingCountsOverTime()")

	wantCounts := []int64{100, 110, 105, 50}
	require.Len(t, got, len(wantCounts), "GetListingCountsOverTime()")

	gotCounts := make([]int64, len(got))
	for i, row := range got {
		gotCounts[i] = row.Count
	}
	assert.Equal(t, wantCounts, gotCounts, "GetListingCountsOverTime() counts, full sequence: %+v", got)

	assert.Nil(t, got[0].EventTimestamp, "got[0].EventTimestamp should be nil (the base count row)")
	for i := 1; i < len(got); i++ {
		assert.NotNil(t, got[i].EventTimestamp, "got[%d].EventTimestamp should be set (only the base row should be nil)", i)
	}
}

func TestGetListingCountsOverTime_UnknownListing(t *testing.T) {
	pool := testdb.Pool(t)
	acctStore := accounts.NewStore(testdb.Logger(), pool)
	reportsStore := reports.NewStore(testdb.Logger(), pool, acctStore)
	ctx := context.Background()

	acctID, shopID := setupEtsyMockShop(t, pool, acctStore)

	_, err := reportsStore.GetListingCountsOverTime(ctx, acctID, accounts.Etsy, shopID, "no-such-listing")
	require.ErrorIs(t, err, consts.ErrNotFound, "GetListingCountsOverTime()")
}

func TestGetListingCountsReport(t *testing.T) {
	pool := testdb.Pool(t)
	acctStore := accounts.NewStore(testdb.Logger(), pool)
	reportsStore := reports.NewStore(testdb.Logger(), pool, acctStore)
	ctx := context.Background()

	acctID, shopID := setupEtsyMockShop(t, pool, acctStore)
	listingID := createEtsyListing(t, acctStore, acctID, shopID, 100)

	_, err := acctStore.SaveNewMockSale(ctx, acctID, accounts.Etsy, shopID, listingID, 10)
	require.NoError(t, err, "SaveNewMockSale()")
	_, err = acctStore.SaveNewMockInventoryReset(ctx, acctID, accounts.Etsy, shopID, listingID, 20)
	require.NoError(t, err, "SaveNewMockInventoryReset()")

	report, err := reportsStore.GetListingCountsReport(ctx, acctID, accounts.Etsy, shopID, listingID)
	require.NoError(t, err, "GetListingCountsReport()")

	assert.Equal(t, acctID, report.AccountID, "report.AccountID")
	assert.Equal(t, accounts.Etsy, report.Platform, "report.Platform")
	assert.Equal(t, shopID, report.ShopID, "report.ShopID")
	assert.Equal(t, listingID, report.ListingID, "report.ListingID")

	// counts over the sequence: 100 (base) -> 110 (sale +10) -> 20 (reset)
	assert.Equal(t, int64(110), report.MaxCount().Count, "MaxCount().Count")
	assert.Equal(t, int64(20), report.MinCount().Count, "MinCount().Count")
}