package service

import (
    "xps/cache"
    "xps/datasource"
    "xps/repositories"
    "xps/viewmodels"
)

type ApiGatewayService interface {
    Get(apiCode string, m map[string]interface{})(map[string]interface{}, error)
    GetPage(apiCode string, m map[string]interface{})(*viewmodels.PageResult, error)
    GetList(apiCode string, m map[string]interface{})([]map[string]interface{}, error)
    
    Create(apiCode string, m map[string]interface{})error
    Update(apiCode string, m map[string]interface{})error
    Patch(apiCode string, m map[string]interface{})error
    Delete(apiCode string, m map[string]interface{})error
}

type apiGatewayService struct {
    dataBus *repositories.DataBusRepo
}

func NewApiGatewayService() ApiGatewayService {
    return &apiGatewayService{
        dataBus: repositories.NewDataBusRepo(datasource.InstanceSlave()),
    }
}

func (a *apiGatewayService) Get(apiCode string, m map[string]interface{})(map[string]interface{}, error) {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return nil, err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return nil, err2
    }
    
    sqlStatement := apiDef.SqlStatement
    return a.dataBus.GetById(sqlStatement, params)
}

func (a *apiGatewayService) GetList(apiCode string, m map[string]interface{})([]map[string]interface{}, error) {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return nil, err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return nil, err2
    }
    
    sqlStatement := apiDef.SqlStatement
    return a.dataBus.GetList(sqlStatement, params)
}

func (a *apiGatewayService) GetPage(apiCode string, m map[string]interface{}) (*viewmodels.PageResult, error) {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return nil, err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return nil, err2
    }
    
    sqlStatement := apiDef.SqlStatement
    sqlCount     := apiDef.SqlCount
    return a.dataBus.GetPage(sqlStatement, sqlCount, params)
}

func (a *apiGatewayService) Create(apiCode string, m map[string]interface{}) error {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return err2
    }
    
    return a.dataBus.Create(objectCode, params)
}

func (a *apiGatewayService) Update(apiCode string, m map[string]interface{}) error {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return err2
    }
    
    return a.dataBus.Update(objectCode, params)
}

func (a *apiGatewayService) Patch(apiCode string, m map[string]interface{}) error {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return err2
    }
    
    return a.dataBus.Patch(objectCode, params)
}

func (a *apiGatewayService) Delete(apiCode string, m map[string]interface{}) error {
    apiDef, err1 := cache.GetApiData(apiCode)
    if err1 != nil{
        return err1
    }
    
    objectCode := apiDef.ObjectCode
    params, err2 := a.Mapping2ModelField(objectCode, m)
    if err2 != nil {
        return err2
    }
    
    return a.dataBus.Delete(objectCode, params)
}

func (a *apiGatewayService) Mapping2ModelField(objectCode string, m map[string]interface{})(map[string]interface{}, error) {
    bzObject, err := cache.GetBizObjectData(objectCode)
    if err != nil {
        return nil, err
    }
    
    bizObjectAttrs := bzObject.Attrs
    params := make(map[string]interface{}, 0)
    for _, bzAttr := range bizObjectAttrs {
        bzAttrCode    := bzAttr.AttrCode
        bzMappingCode := bzAttr.MappingCode
        if bzAttrValue, ok := m[bzAttrCode]; ok {
            params[bzMappingCode] = bzAttrValue
        }
    }
    return params, nil
}