package utils

import (
	"fmt"
	"strconv"

	jsoniter "github.com/json-iterator/go"

	"lone-services/pkg/modelbase"
	"lone-services/pkg/utils"
	"lone-services/services/wecom/internal/dao"
	"lone-services/services/wecom/internal/model"
)

// GetLatestReviewChange 按业务类型+业务ID取最新一条变更快照
func GetLatestReviewChange(bizType uint8, bizId int64) (*dao.ReviewChange, error) {
	var change dao.ReviewChange
	err := model.ReviewChangeModel{}.Init().GetOne(modelbase.Params{
		Eq: map[string]string{
			"type":   strconv.FormatUint(uint64(bizType), 10),
			"biz_id": strconv.FormatInt(bizId, 10),
		},
		Order: "id desc",
	}, &change)
	if err != nil {
		return nil, err
	}
	if change.Id < 1 {
		return nil, fmt.Errorf("review change not found")
	}
	return &change, nil
}

// DiffContent 拼成旧 diff 逻辑使用的 {"old":...,"new":...} JSON
func DiffContent(change *dao.ReviewChange) string {
	before := change.BeforeData
	after := change.AfterData
	if before == utils.StringEmpty {
		before = "null"
	}
	if after == utils.StringEmpty {
		after = "null"
	}
	return fmt.Sprintf(`{"old":%s,"new":%s}`, before, after)
}

// BizFieldFromChange 从 after/before JSON 中取展示字段（如 name、type_name）
func BizFieldFromChange(change *dao.ReviewChange, field string) string {
	if change == nil || field == utils.StringEmpty {
		return utils.StringEmpty
	}
	for _, raw := range []string{change.AfterData, change.BeforeData} {
		if raw == utils.StringEmpty {
			continue
		}
		var m map[string]any
		if err := jsoniter.Unmarshal([]byte(raw), &m); err != nil {
			continue
		}
		if v, ok := m[field].(string); ok && v != utils.StringEmpty {
			return v
		}
	}
	return utils.StringEmpty
}