package trafficusage

import (
	"context"
	"database/sql"
	"database/sql/driver"
	"errors"
	"io"
	"strings"
	"testing"
	"time"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gcfg"

	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/library/tdengine"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/model"
)

type routingDriver struct{ statements []string }
type routingConnection struct{ owner *routingDriver }
type routingRows struct {
	count   bool
	emitted bool
}

func (recorder *routingDriver) Open(string) (driver.Conn, error) {
	return &routingConnection{owner: recorder}, nil
}
func (connection *routingConnection) Prepare(string) (driver.Stmt, error) {
	return nil, errors.New("unexpected prepare")
}
func (connection *routingConnection) Close() error { return nil }
func (connection *routingConnection) Begin() (driver.Tx, error) {
	return nil, errors.New("unexpected transaction")
}
func (connection *routingConnection) Ping(context.Context) error { return nil }
func (connection *routingConnection) ExecContext(_ context.Context, statement string, _ []driver.NamedValue) (driver.Result, error) {
	connection.owner.statements = append(connection.owner.statements, statement)
	return driver.RowsAffected(1), nil
}
func (connection *routingConnection) QueryContext(_ context.Context, statement string, _ []driver.NamedValue) (driver.Rows, error) {
	connection.owner.statements = append(connection.owner.statements, statement)
	return &routingRows{count: strings.Contains(statement, "COUNT(*)")}, nil
}
func (rows *routingRows) Columns() []string {
	if rows.count {
		return []string{"count"}
	}
	return []string{"ts", "usage_mb", "package_code", "iccid"}
}
func (rows *routingRows) Close() error { return nil }
func (rows *routingRows) Next(values []driver.Value) error {
	if !rows.count || rows.emitted {
		return io.EOF
	}
	rows.emitted = true
	values[0] = int64(0)
	return nil
}

var routingRecorder = &routingDriver{}

func init() {
	sql.Register("admin_traffic_split_routing", routingRecorder)
}

func TestTrafficUsageReadWriteDeleteSplitRouting(t *testing.T) {
	recorder := routingRecorder
	recorder.statements = nil
	previous := g.Cfg().GetAdapter()
	t.Cleanup(func() { _ = tdengine.Close(); g.Cfg().SetAdapter(previous) })
	adapter, err := gcfg.NewAdapterContent("tsdb:\n  database: TdEngine\n  tdengine:\n    type: admin_traffic_split_routing\n    dsn: test\n    dbName: legacy\n    dailyDbName: iotlcm_daily\n    monthlyDbName: iotlcm_monthly\n")
	if err != nil {
		t.Fatal(err)
	}
	g.Cfg().SetAdapter(adapter)
	_ = tdengine.Close()
	usage := NewTrafficUsage()
	ctx := context.Background()
	period := time.Date(2026, 10, 21, 0, 0, 0, 0, time.FixedZone("CST", 8*60*60))
	base := model.TrafficUsageBase{Iccid: "8986112520609988658", UsageMb: 12.5, PackageCode: "test"}
	for _, test := range []struct {
		name      string
		database  string
		stable    string
		operation func() error
	}{
		{"write_daily", "iotlcm_daily", "sim_card_usage_d_", func() error {
			return usage.WriteDaily(ctx, []model.TrafficUsageDailyItem{{TrafficUsageBase: base, Date: period}})
		}},
		{"write_monthly", "iotlcm_monthly", "sim_card_usage_m_", func() error {
			return usage.WriteMonthly(ctx, []model.TrafficUsageMonthlyItem{{TrafficUsageBase: base, Month: period}})
		}},
		{"read_daily", "iotlcm_daily", "sim_card_usage_d_", func() error {
			_, _, err := usage.QueryDaily(ctx, model.TrafficUsageQueryInput{Iccid: base.Iccid})
			return err
		}},
		{"read_monthly", "iotlcm_monthly", "sim_card_usage_m_", func() error {
			_, _, err := usage.QueryMonthly(ctx, model.TrafficUsageQueryInput{Iccid: base.Iccid})
			return err
		}},
		{"delete_daily", "iotlcm_daily", "sim_card_usage_d_", func() error {
			return usage.DeleteDaily(ctx, model.TrafficUsageDeleteInput{Iccid: base.Iccid, StartTime: period, EndTime: period.AddDate(0, 0, 1)})
		}},
		{"delete_monthly", "iotlcm_monthly", "sim_card_usage_m_", func() error {
			return usage.DeleteMonthly(ctx, model.TrafficUsageDeleteInput{Iccid: base.Iccid, StartTime: period, EndTime: period.AddDate(0, 1, 0)})
		}},
	} {
		t.Run(test.name, func(t *testing.T) {
			recorder.statements = nil
			if err := test.operation(); err != nil {
				t.Fatal(err)
			}
			if len(recorder.statements) == 0 {
				t.Fatal("no SQL issued")
			}
			for _, statement := range recorder.statements {
				normalized := strings.ReplaceAll(statement, "\x60", "")
				if !strings.Contains(normalized, test.database+"."+test.stable+base.Iccid) || strings.Contains(normalized, "legacy.") {
					t.Errorf("wrong target database: %s", statement)
				}
			}
		})
	}
}