package aliasmanagement

import (
	"context"
	"fmt"
	"strings"

	"git.x2erp.com/qdy/go-base/ctx"
	"git.x2erp.com/qdy/go-base/logger"
	"git.x2erp.com/qdy/go-base/model/request/queryreq"
	"git.x2erp.com/qdy/go-base/model/response"
	"git.x2erp.com/qdy/go-base/util"
	"git.x2erp.com/qdy/go-db/factory/database"
	"git.x2erp.com/qdy/go-svc-configure/internal/tables"
)

// ListTableFieldAlias 查询字段别名字典列表（支持分页、搜索、排序）
func ListTableFieldAlias(req *TableFieldAliasQueryRequest, ctx context.Context, dbFactory *database.DBFactory, reqCtx *ctx.RequestContext) *response.QueryResult[[]tables.DicTableFieldAliasDB] {
	if logger.IsDebug() {
		logger.Debug("ListTableFieldAlias req: %v", req)
	}

	// 检查请求参数是否为nil
	if req == nil {
		logger.ErrorC(reqCtx, "ListTableFieldAlias请求参数为nil，创建默认参数")
		req = &TableFieldAliasQueryRequest{}
		req.Page = 0
		req.PageSize = 10
	}

	// 验证和规范化请求参数
	req.Validate()

	// 将旧字段转换为新的Filters和Sorts（向后兼容）
	convertLegacyTableFieldAliasFields(req)

	logger.Debug(fmt.Sprintf("ListTableFieldAlias-开始查询字段别名字典，参数: page=%d, pageSize=%d, filters=%d, sorts=%d, legacyFields=[tableID=%s, fieldID=%s, fieldName=%s, fieldAlias=%s]",
		req.Page, req.PageSize, len(req.Filter), len(req.Filter), req.TableID, req.FieldID, req.FieldName, req.FieldAlias))

	// 获取数据库连接
	db := dbFactory.GetDB()

	// 定义字段映射函数：前端字段名 -> 数据库列名
	fieldMapper := func(field string) string {
		switch field {
		case "id":
			return "id"
		case "fieldID":
			return "field_id"
		case "tableID":
			return "table_id"
		case "fieldName":
			return "field_name"
		case "fieldAlias":
			return "field_alias"
		case "description":
			return "description"
		case "whereCondition":
			return "where"
		case "createdAt":
			return "created_at"
		case "updatedAt":
			return "updated_at"
		case "deletedAt":
			return "deleted_at"
		default:
			// 未知字段，返回空字符串（将被忽略）
			return ""
		}
	}

	// 使用通用查询构建器构建SQL
	whereClause, whereArgs := queryreq.BuildWhereClause(req.Filter, fieldMapper)
	orderByClause := queryreq.BuildOrderByClause(req.Sort, fieldMapper)

	// 构建基础查询
	baseQuery := `
		SELECT id, field_id, table_id, field_name, field_alias, description, where, created_at, updated_at, deleted_at
		FROM dic_table_field_alias
		WHERE deleted_at IS NULL
	`

	// 构建计数查询
	countQuery := "SELECT COUNT(*) FROM dic_table_field_alias WHERE deleted_at IS NULL"
	if whereClause != "" {
		// 移除"WHERE"前缀并清理空格
		conditions := strings.TrimSpace(strings.TrimPrefix(whereClause, "WHERE"))
		if conditions != "" {
			countQuery += " AND " + conditions
		}
	}

	// 构建数据查询
	dataQuery := baseQuery
	if whereClause != "" {
		// 移除"WHERE"前缀并清理空格
		conditions := strings.TrimSpace(strings.TrimPrefix(whereClause, "WHERE"))
		if conditions != "" {
			dataQuery += " AND " + conditions
		}
	}
	if orderByClause != "" {
		dataQuery += " " + orderByClause
	} else {
		// 默认排序
		dataQuery += " ORDER BY table_id, field_name, field_alias"
	}

	// 添加分页限制
	dataQuery += " LIMIT ? OFFSET ?"
	queryArgs := append(whereArgs, req.PageSize, req.GetOffset())

	// 查询总记录数
	var totalCount int64
	err := db.GetContext(ctx, &totalCount, countQuery, whereArgs...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("查询字段别名字典总数失败: %v", err))
		return util.CreateErrorResult[[]tables.DicTableFieldAliasDB](fmt.Sprintf("查询字段别名字典总数失败: %v", err), reqCtx)
	}

	// 查询分页数据
	var tableFieldAliasList []tables.DicTableFieldAliasDB
	err = db.SelectContext(ctx, &tableFieldAliasList, dataQuery, queryArgs...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("查询字段别名字典失败: %v", err))
		return util.CreateErrorResult[[]tables.DicTableFieldAliasDB](fmt.Sprintf("查询字段别名字典失败: %v", err), reqCtx)
	}

	logger.Debug(fmt.Sprintf("查询到 %d 条字段别名字典，总记录数: %d", len(tableFieldAliasList), totalCount))

	// 创建结果，设置TotalCount
	result := util.CreateSuccessResultData[[]tables.DicTableFieldAliasDB](tableFieldAliasList, reqCtx)
	result.TotalCount = int(totalCount)

	// 计算总页数
	pageSize := req.PageSize
	if pageSize <= 0 {
		pageSize = 10 // 默认每页10条
	}
	lastPage := 1
	if pageSize > 0 && totalCount > 0 {
		lastPage = (int(totalCount) + pageSize - 1) / pageSize
	}
	result.LastPage = lastPage

	logger.Debug(fmt.Sprintf("设置QueryResult TotalCount: %d, LastPage: %d", result.TotalCount, result.LastPage))
	return result
}

// convertLegacyTableFieldAliasFields 将旧字段转换为新的Filters和Sorts（向后兼容）
func convertLegacyTableFieldAliasFields(req *TableFieldAliasQueryRequest) {
	// 转换旧搜索字段为Filters
	if req.TableID != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "tableID",
			Operator: queryreq.OpLike,
			Value:    req.TableID,
		})
	}
	if req.FieldID != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "fieldID",
			Operator: queryreq.OpLike,
			Value:    req.FieldID,
		})
	}
	if req.FieldName != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "fieldName",
			Operator: queryreq.OpLike,
			Value:    req.FieldName,
		})
	}
	if req.FieldAlias != "" {
		req.Filter = append(req.Filter, queryreq.FilterParam{
			Field:    "fieldAlias",
			Operator: queryreq.OpLike,
			Value:    req.FieldAlias,
		})
	}

	// 转换旧排序字段为Sorts
	if req.SortField != "" {
		// 映射可能的旧字段名
		sortField := req.SortField
		switch sortField {
		case "field_id":
			sortField = "fieldID"
		case "table_id":
			sortField = "tableID"
		case "field_name":
			sortField = "fieldName"
		case "field_alias":
			sortField = "fieldAlias"
		case "description":
			sortField = "description"
		case "where":
			sortField = "whereCondition"
		case "created_at":
			sortField = "createdAt"
		case "updated_at":
			sortField = "updatedAt"
		}

		sortOrder := req.SortOrder
		if sortOrder != "asc" && sortOrder != "desc" {
			sortOrder = "asc"
		}

		req.Sort = append(req.Sort, queryreq.SortParam{
			Field: sortField,
			Order: sortOrder,
		})
	}
}

// SearchTableFieldAlias 搜索字段别名字典（简单搜索）
func SearchTableFieldAlias(ctx context.Context, dbFactory *database.DBFactory, tableID, fieldID, fieldName, fieldAlias string, reqCtx *ctx.RequestContext) *response.QueryResult[[]tables.DicTableFieldAliasDB] {
	logger.Debug("SearchTableFieldAlias-开始搜索字段别名字典")

	// 获取数据库连接
	db := dbFactory.GetDB()

	// 构建查询条件和参数
	query := `
		SELECT id, field_id, table_id, field_name, field_alias, description, where, created_at, updated_at, deleted_at
		FROM dic_table_field_alias 
		WHERE deleted_at IS NULL
	`
	var args []interface{}

	if tableID != "" {
		query += " AND table_id LIKE ?"
		args = append(args, "%"+tableID+"%")
	}
	if fieldID != "" {
		query += " AND field_id LIKE ?"
		args = append(args, "%"+fieldID+"%")
	}
	if fieldName != "" {
		query += " AND field_name LIKE ?"
		args = append(args, "%"+fieldName+"%")
	}
	if fieldAlias != "" {
		query += " AND field_alias LIKE ?"
		args = append(args, "%"+fieldAlias+"%")
	}

	query += " ORDER BY table_id, field_name, field_alias"

	var tableFieldAliasList []tables.DicTableFieldAliasDB
	err := db.SelectContext(ctx, &tableFieldAliasList, query, args...)
	if err != nil {
		logger.ErrorC(reqCtx, fmt.Sprintf("搜索字段别名字典失败: %v", err))
		return util.CreateErrorResult[[]tables.DicTableFieldAliasDB](fmt.Sprintf("搜索字段别名字典失败: %v", err), reqCtx)
	}

	logger.Debug(fmt.Sprintf("搜索到 %d 条字段别名字典", len(tableFieldAliasList)))
	return util.CreateSuccessResultData(tableFieldAliasList, reqCtx)
}