package sql_result

import (
	"fmt"
	"git.sxidc.com/go-tools/utils/encoding"
	"git.sxidc.com/go-tools/utils/reflectutils"
	"git.sxidc.com/go-tools/utils/strutils"
	"github.com/pkg/errors"
	"reflect"
	"strings"
	"time"
)

const (
	timeMicroFormat = "2006-01-02T15:04:05.000000"
	timeMilliFormat = "2006-01-02T15:04:05.000"
	timeSecFormat   = "2006-01-02T15:04:05"
)

func DefaultUsage(result map[string]any, e any, columnName string) error {
	if result == nil || len(result) == 0 {
		return nil
	}

	err := UseTag(e, defaultCallback(result, columnName))
	if err != nil {
		return err
	}

	return nil
}

func defaultCallback(result map[string]any, columnName string) OnParsedFieldTagFunc {
	return func(fieldName string, entityFieldElemValue reflect.Value, tag *Tag) error {
		if strutils.IsStringNotEmpty(columnName) && columnName != tag.Name {
			return nil
		}

		resultValue, ok := result[tag.Name]
		if !ok {
			return nil
		}

		if resultValue == nil {
			return nil
		}

		entityFieldKind := reflectutils.GroupValueKind(entityFieldElemValue)

		switch entityFieldKind {
		case reflect.Bool:
			return reflectutils.AssignBoolValue(resultValue, entityFieldElemValue)
		case reflect.String:
			strValue, ok := resultValue.(string)
			if ok {
				// 实体字段是字符串类型，接收到的是数据库时间格式
				parsedTime, err := parseTimeStringResult(strValue)
				if err == nil {
					// 转换成功说明是时间字符串
					strValue = parsedTime.Format(tag.TimeLayout)
				}

				parsedValue, err := dealStringResultValue(strValue, tag)
				if err != nil {
					return err
				}

				return reflectutils.AssignStringValue(parsedValue, entityFieldElemValue)
			}

			timeResult, ok := resultValue.(time.Time)
			if ok {
				return reflectutils.AssignStringValue(timeResult.Format(tag.TimeLayout), entityFieldElemValue)
			}

			return errors.New("查询到的值无法赋值为string类型")
		case reflect.Int64:
			return reflectutils.AssignInt64Value(resultValue, entityFieldElemValue)
		case reflect.Uint64:
			return reflectutils.AssignUint64Value(resultValue, entityFieldElemValue)
		case reflect.Float64:
			return reflectutils.AssignFloat64Value(resultValue, entityFieldElemValue)
		case reflect.Struct:
			// 实体字段是time.Time，接收到的是数据库时间格式
			if reflectutils.IsValueTime(entityFieldElemValue) {
				timeStr, ok := resultValue.(string)
				if ok {
					parsedTime, err := parseTimeStringResult(timeStr)
					if err != nil {
						return err
					}

					entityFieldElemValue.Set(reflect.ValueOf(parsedTime))
					return nil
				}

				timeResult, ok := resultValue.(time.Time)
				if ok {
					entityFieldElemValue.Set(reflect.ValueOf(timeResult))
					return nil
				}

				return errors.New("查询到的值无法赋值为time.Time类型")
			}

			return fmt.Errorf("字段: %s 列: %s 不支持的类型: %s",
				fieldName, tag.Name, entityFieldElemValue.Type().String())
		case reflect.Slice:
			if !reflectutils.IsSliceValueOf(entityFieldElemValue, reflect.String) {
				return errors.New(fieldName + " Error: slice仅支持[]string")
			}

			strValue, ok := resultValue.(string)
			if !ok {
				return errors.New("Result Type Error: slice仅支持[]string")
			}

			strParts := strings.Split(strValue, tag.SplitWith)
			if strParts == nil || len(strParts) == 0 {
				return nil
			}

			valSlice := entityFieldElemValue
			if valSlice.IsNil() {
				valSlice = reflect.MakeSlice(entityFieldElemValue.Type(), 0, 0)
			}

			for _, strPart := range strParts {
				valSlice = reflect.Append(valSlice, reflect.ValueOf(strPart))
			}

			entityFieldElemValue.Set(valSlice)
			return nil
		default:
			return fmt.Errorf("字段: %s 列: %s 不支持的类型: %s",
				fieldName, tag.Name, entityFieldElemValue.Type().String())
		}
	}
}

func parseTimeStringResult(timeStr string) (time.Time, error) {
	layout := timeSecFormat

	timeZoneIndex := strings.LastIndex(timeStr, "+08:")
	if timeZoneIndex != -1 {
		timeStr = timeStr[:timeZoneIndex]

		afterSecondIndex := strings.LastIndex(timeStr, ".")
		if afterSecondIndex != -1 {
			if len(timeStr)-afterSecondIndex-1 == 6 {
				layout = timeMicroFormat
			} else if len(timeStr)-afterSecondIndex-1 == 3 {
				layout = timeMilliFormat
			}
		}
	}

	parsedTime, err := time.ParseInLocation(layout, timeStr, time.Local)
	if err != nil {
		return time.Time{}, errors.New(err.Error())
	}

	return parsedTime, nil
}

func dealStringResultValue(value string, tag *Tag) (string, error) {
	retValue := value

	if strutils.IsStringNotEmpty(tag.AESKey) {
		decryptedValue, err := encoding.AESDecrypt(retValue, tag.AESKey)
		if err != nil {
			return "", err
		}

		retValue = decryptedValue
	}

	if strutils.IsStringNotEmpty(tag.Trim) {
		retValue = strings.Trim(retValue, tag.Trim)
	} else {
		if strutils.IsStringNotEmpty(tag.TrimPrefix) {
			retValue = strings.TrimPrefix(retValue, tag.TrimPrefix)
		}

		if strutils.IsStringNotEmpty(tag.TrimSuffix) {
			retValue = strings.TrimSuffix(retValue, tag.TrimSuffix)
		}
	}

	return retValue, nil
}