package dbs

import (
	"encoding/json"
	"fmt"
	"time"

	"git.x2erp.com/qdy/go-svc-mcp/internal/mcp"
)

func init() {
	mcp.Register("get_oracle_tables", "获取Oracle数据库中的所有表和描述",
		map[string]interface{}{
			"type": "object",
			"properties": map[string]interface{}{
				"include_system_tables": map[string]interface{}{
					"type":        "boolean",
					"description": "是否包含系统表",
					"default":     false,
				},
				"schema": map[string]interface{}{
					"type":        "string",
					"description": "模式名称（默认为当前用户）",
					"default":     "",
				},
				"database_key": map[string]interface{}{
					"type":        "string",
					"description": "数据库配置键名（如：business），可选，默认使用主数据库",
					"enum":        []string{"warehouse", "business"},
					"default":     "warehouse",
				},
			},
			"required": []string{},
		},
		func(input json.RawMessage, deps *mcp.ToolDependencies) (interface{}, error) {
			var params struct {
				IncludeSystemTables bool   `json:"include_system_tables"`
				Schema              string `json:"schema"`
				DatabaseKey         string `json:"database_key"`
			}

			if len(input) > 0 {
				if err := json.Unmarshal(input, &params); err != nil {
					return nil, err
				}
			}

			// 获取数据库工厂
			dbFactory, err := GetDBFactory(params.DatabaseKey, deps)
			if err != nil {
				return nil, err
			}

			// 获取数据库类型，确保是Oracle
			dbType := dbFactory.GetDBType()
			if dbType != "oracle" {
				return nil, fmt.Errorf("当前数据库类型为 %s，此工具仅支持Oracle数据库", dbType)
			}

			// 构建查询SQL
			var query string
			if params.Schema == "" {
				// 查询当前用户下的表
				if params.IncludeSystemTables {
					query = `
						SELECT 
							table_name,
							comments as table_description
						FROM user_tab_comments
						WHERE table_type = 'TABLE'
						ORDER BY table_name`
				} else {
					query = `
						SELECT 
							table_name,
							comments as table_description
						FROM user_tab_comments
						WHERE table_type = 'TABLE'
						AND table_name NOT LIKE 'BIN$%'  -- 排除回收站中的表
						AND table_name NOT LIKE 'DR$%'   -- 排除全文索引表
						AND table_name NOT LIKE 'SYS_%'  -- 排除系统表
						ORDER BY table_name`
				}
			} else {
				// 查询指定模式下的表
				if params.IncludeSystemTables {
					query = `
						SELECT 
							owner as schema_name,
							table_name,
							comments as table_description
						FROM all_tab_comments
						WHERE table_type = 'TABLE'
						AND owner = UPPER(:1)
						ORDER BY table_name`
				} else {
					query = `
						SELECT 
							owner as schema_name,
							table_name,
							comments as table_description
						FROM all_tab_comments
						WHERE table_type = 'TABLE'
						AND owner = UPPER(:1)
						AND table_name NOT LIKE 'BIN$%'
						AND table_name NOT LIKE 'DR$%'
						AND table_name NOT LIKE 'SYS_%'
						ORDER BY table_name`
				}
			}

			// 执行查询
			var results []map[string]interface{}

			if params.Schema == "" {
				results, err = dbFactory.QuerySliceMap(query)
			} else {
				results, err = dbFactory.QuerySliceMapWithParams(query, params.Schema)
			}

			if err != nil {
				return nil, fmt.Errorf("查询表信息失败: %v", err)
			}

			// 如果没有描述信息，设置为空字符串
			for i := range results {
				if results[i]["table_description"] == nil {
					results[i]["table_description"] = ""
				}
			}

			return map[string]interface{}{
				"tenant_id":             deps.ReqCtx.TenantID,
				"user_id":               deps.ReqCtx.UserID,
				"database_type":         dbType,
				"database_name":         dbFactory.GetDatabaseName(),
				"schema":                params.Schema,
				"include_system_tables": params.IncludeSystemTables,
				"tables":                results,
				"total_tables":          len(results),
				"timestamp":             time.Now().Format(time.RFC3339),
			}, nil
		},
	)
}