package gateway

import (
	"git.sxidc.com/go-framework/baize/framework/core/api"
	"git.sxidc.com/go-tools/utils/http_client"
	"github.com/pkg/errors"
)

// ResponseSuccessCallback 网关API成功响应回调
type ResponseSuccessCallback func(c *RequestBuilderContext)

// ResponseErrorCallback 网关API错误响应回调
type ResponseErrorCallback func(c *RequestBuilderContext, err error)

// BeforeRequestCallback 请求发送前的回调
type BeforeRequestCallback func(c *RequestBuilderContext) error

// RequestResponseCallback 请求响应回调
type RequestResponseCallback func(c *RequestBuilderContext, response *http_client.Response) error

type RequestOption func(options *RequestOptions)

type RequestOptions struct {
	beforeRequestCallback   BeforeRequestCallback
	requestResponseCallback RequestResponseCallback
}

// WithBeforeRequestCallback 设置请求发送前的回调请求选项
func WithBeforeRequestCallback(callback BeforeRequestCallback) RequestOption {
	return func(options *RequestOptions) {
		options.beforeRequestCallback = callback
	}
}

// WithRequestResponseCallback 设置请求响应回调请求选项
func WithRequestResponseCallback(callback RequestResponseCallback) RequestOption {
	return func(options *RequestOptions) {
		options.requestResponseCallback = callback
	}
}

// RequestBuilderContext 请求构建器上下文
type RequestBuilderContext struct {
	apiContext      *api.Context
	historyRequests []Request
	resultMap       map[string]any
}

func newRequestBuilderContext(c *api.Context) *RequestBuilderContext {
	return &RequestBuilderContext{
		apiContext:      c,
		historyRequests: make([]Request, 0),
		resultMap:       make(map[string]any),
	}
}

// ApiContext 获取Api上下文
// 参数: 无
// 返回值:
// - 上下文
func (c *RequestBuilderContext) ApiContext() *api.Context {
	return c.apiContext
}

// HistoryRequests 获取历史请求(包含响应)
// 参数: 无
// 返回值:
// - 历史请求
func (c *RequestBuilderContext) HistoryRequests() []Request {
	return c.historyRequests
}

// GetResultMapValue 获取结果Map的值
// 参数:
// - key: 键
// 返回值:
// - 值
func (c *RequestBuilderContext) GetResultMapValue(key string) any {
	return c.resultMap[key]
}

// SetResultMapValue 设置结果Map的值
// 参数:
// - key: 键
// - 值
// 返回值: 无
func (c *RequestBuilderContext) SetResultMapValue(key string, value any) {
	c.resultMap[key] = value
}

// RequestBuilder 请求构建器
type RequestBuilder struct {
	c           *RequestBuilderContext
	httpRequest *http_client.Request
	params      *requestBuilderParams
}

func newRequestBuilder(c *api.Context, httpRequest *http_client.Request) *RequestBuilder {
	return &RequestBuilder{
		c:           newRequestBuilderContext(c),
		httpRequest: httpRequest,
		params:      newRequestBuilderParams(),
	}
}

// ApiContext 获取Api上下文
// 参数: 无
// 返回值:
// - 上下文
func (builder *RequestBuilder) ApiContext() *api.Context {
	return builder.c.apiContext
}

// Post 定义POST请求
// 参数:
// - request: PostRequest
// - opts: 请求选项
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) Post(request *PostRequest, opts ...RequestOption) *RequestBuilder {
	return builder.request(request, opts...)
}

// Delete 定义Delete请求
// 参数:
// - request: DeleteRequest
// - opts: 请求选项
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) Delete(request *DeleteRequest, opts ...RequestOption) *RequestBuilder {
	return builder.request(request, opts...)
}

// Put 定义Put请求
// 参数:
// - request: PutRequest
// - opts: 请求选项
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) Put(request *PutRequest, opts ...RequestOption) *RequestBuilder {
	return builder.request(request, opts...)
}

// Get 定义Get请求
// 参数:
// - request: GetRequest
// - opts: 请求选项
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) Get(request *GetRequest, opts ...RequestOption) *RequestBuilder {
	return builder.request(request, opts...)
}

// ResponseSuccessCallback 设置网关API成功响应回调
// 参数:
// - responseSuccessCallback: 网关API成功响应回调，默认回调会将最后一个请求的响应作为网关API的响应返回
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) ResponseSuccessCallback(responseSuccessCallback ResponseSuccessCallback) *RequestBuilder {
	builder.params.responseSuccessCallback = responseSuccessCallback
	return builder
}

// ResponseErrorCallback 设置网关API错误响应回调
// 参数:
// - responseErrorCallback: 网关API错误响应回调，默认回调会按照是否存在错误返回MsgResponse
// 返回值:
// - RequestBuilder
func (builder *RequestBuilder) ResponseErrorCallback(responseErrorCallback ResponseErrorCallback) *RequestBuilder {
	builder.params.responseErrorCallback = responseErrorCallback
	return builder
}

// Request 发送构造的请求链
// 参数: 无
// 返回值: 无
func (builder *RequestBuilder) Request() {
	httpRequest := builder.httpRequest

	for _, requestItem := range builder.params.requestItems {
		if requestItem.options.beforeRequestCallback != nil {
			err := requestItem.options.beforeRequestCallback(builder.c)
			if err != nil {
				builder.params.responseErrorCallback(builder.c, errors.New(err.Error()))
				return
			}
		}

		requestWithResponse, err := requestItem.builderRequest.Request(builder.c.apiContext, httpRequest)
		if err != nil {
			builder.params.responseErrorCallback(builder.c, errors.New(err.Error()))
			return
		}

		builder.c.historyRequests = append(builder.c.historyRequests, requestWithResponse)

		if requestItem.options.requestResponseCallback != nil {
			err := requestItem.options.requestResponseCallback(builder.c, requestWithResponse.Response())
			if err != nil {
				builder.params.responseErrorCallback(builder.c, errors.New(err.Error()))
				return
			}
		}
	}

	builder.params.responseSuccessCallback(builder.c)
}

// ResponseError 利用网关API错误响应回调发送网关API响应
// 参数:
// - 错误
// 返回值: 无
func (builder *RequestBuilder) ResponseError(err error) {
	builder.params.responseErrorCallback(builder.c, err)
}

// ResponseSuccess 利用网关API成功响应回调发送网关API响应
// 参数: 无
// 返回值: 无
func (builder *RequestBuilder) ResponseSuccess() {
	builder.params.responseSuccessCallback(builder.c)
}

func (builder *RequestBuilder) request(builderRequest Request, opts ...RequestOption) *RequestBuilder {
	options := new(RequestOptions)
	for _, opt := range opts {
		opt(options)
	}

	builder.params.requestItems = append(builder.params.requestItems, newBuilderRequestItem(builderRequest, options))
	return builder
}