package reports_test

import (
	"context"
	"encoding/json"
	"errors"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgxpool"

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

// setupAmazonMockShop creates a fresh account and an Amazon mock shop for
// it, and registers cleanup for every row it creates, in FK-safe order
// (shop_amazon[_events] -> mock.accounts -> accounts; oauth_users cleanup
// is handled by testdb.SeedOAuthUser itself).
func setupAmazonMockShop(t *testing.T, pool *pgxpool.Pool, acctStore *accounts.Store) (acctID int64, shopID string) {
	t.Helper()
	ctx := context.Background()

	userID := testdb.NewUserID(t)
	testdb.SeedOAuthUser(t, pool, userID)

	acct, err := acctStore.CreateAccount(ctx, userID, userID+"@example.com")
	if err != nil {
		t.Fatalf("CreateAccount() error = %v", err)
	}
	t.Cleanup(func() {
		pool.Exec(context.Background(), "DELETE FROM accounts WHERE account_id = $1", acct.AccountID)
	})

	id, err := acctStore.CreateMockShop(ctx, acct.AccountID, accounts.Amazon, "Test Shop")
	if err != nil {
		t.Fatalf("CreateMockShop() error = %v", err)
	}
	shopID = id.String()

	t.Cleanup(func() {
		ctx := context.Background()
		// a raw_shop_events insert for platform='amazon' fires a trigger
		// that also populates shop_amazon_events - clean that up too even
		// though these tests don't touch the amazon event processor.
		pool.Exec(ctx, "DELETE FROM mock.shop_amazon_events WHERE shop_id = $1", shopID)
		pool.Exec(ctx, "DELETE FROM mock.raw_shop_events WHERE shop_id = $1", shopID)
		pool.Exec(ctx, "DELETE FROM mock.shop_amazon WHERE account_id = $1", acct.AccountID)
		pool.Exec(ctx, "DELETE FROM mock.accounts WHERE account_id = $1", acct.AccountID)
	})

	return acct.AccountID, shopID
}

func insertRawShopEvent(t *testing.T, pool *pgxpool.Pool, shopID, eventID string, ts time.Time, payload string) {
	t.Helper()
	_, err := pool.Exec(context.Background(), `
		INSERT INTO mock.raw_shop_events (platform, shop_id, event_timestamp, event_id, raw_payload)
		VALUES ('amazon', $1, $2, $3, $4::jsonb)
	`, shopID, ts, eventID, payload)
	if err != nil {
		t.Fatalf("failed to insert raw shop event: %v", err)
	}
}

func TestGetRawShopEvents(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 := setupAmazonMockShop(t, pool, acctStore)

	older := time.Now().Add(-time.Hour).UTC()
	newer := time.Now().UTC()
	insertRawShopEvent(t, pool, shopID, "evt-1", older, `{"n":1}`)
	insertRawShopEvent(t, pool, shopID, "evt-2", newer, `{"n":2}`)

	got, err := reportsStore.GetRawShopEvents(ctx, acctID, accounts.Amazon, shopID)
	if err != nil {
		t.Fatalf("GetRawShopEvents() error = %v", err)
	}

	if len(got) != 2 {
		t.Fatalf("GetRawShopEvents() returned %d events, want 2: %+v", len(got), got)
	}

	// ordered event_timestamp DESC, event_id ASC - newest first.
	if got[0].EventID != "evt-2" || got[1].EventID != "evt-1" {
		t.Errorf("GetRawShopEvents() order = [%s, %s], want [evt-2, evt-1]", got[0].EventID, got[1].EventID)
	}

	if got[0].Platform != accounts.Amazon || got[0].ShopID != shopID {
		t.Errorf("got[0] Platform/ShopID = %s/%s, want %s/%s", got[0].Platform, got[0].ShopID, accounts.Amazon, shopID)
	}

	var payload struct{ N int }
	if err := json.Unmarshal(got[0].RawPayload, &payload); err != nil {
		t.Fatalf("failed to unmarshal got[0].RawPayload = %s: %v", got[0].RawPayload, err)
	}
	if payload.N != 2 {
		t.Errorf("got[0].RawPayload n = %d, want 2", payload.N)
	}
}

func TestGetRawShopEvents_NoEvents(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 := setupAmazonMockShop(t, pool, acctStore)

	got, err := reportsStore.GetRawShopEvents(ctx, acctID, accounts.Amazon, shopID)
	if err != nil {
		t.Fatalf("GetRawShopEvents() error = %v", err)
	}
	if len(got) != 0 {
		t.Fatalf("GetRawShopEvents() = %+v, want empty", got)
	}
}

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

	userID := testdb.NewUserID(t)
	testdb.SeedOAuthUser(t, pool, userID)

	acct, err := acctStore.CreateAccount(ctx, userID, userID+"@example.com")
	if err != nil {
		t.Fatalf("CreateAccount() error = %v", err)
	}
	t.Cleanup(func() {
		pool.Exec(context.Background(), "DELETE FROM accounts WHERE account_id = $1", acct.AccountID)
	})

	_, err = reportsStore.GetRawShopEvents(ctx, acct.AccountID, accounts.Amazon, "no-such-shop-"+uuid.NewString())
	if !errors.Is(err, consts.ErrNotFound) {
		t.Fatalf("GetRawShopEvents() error = %v, want %v", err, consts.ErrNotFound)
	}
}