package oci

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net/http"

	"github.com/oracle/oci-go-sdk/v65/common"
)

// compatResponsesLimit 限制直通响应体大小;web_search 输出含多段引用,给足余量。
const compatResponsesLimit = int64(8 << 20)

// GenAiCompatResponses 实现 Client:把 OpenAI Responses 请求体直通到 OCI
// `/20231130/actions/v1/responses`(IAM 签名)。该端点实测可执行 xAI 服务端工具
// (web_search / x_search),但不在 Oracle 文档化工具白名单内,行为可能随服务
// 版本、模型或区域变化;调用方须自行校验并改写请求体(store/stream)。
func (c *RealClient) GenAiCompatResponses(ctx context.Context, cred Credentials, region string, body []byte) ([]byte, error) {
	ic, err := c.genAiInferenceClient(cred, region)
	if err != nil {
		return nil, err
	}
	client := ic.BaseClient
	common.UpdateEndpointTemplateForOptions(&client)
	common.SetMissingTemplateParams(&client)
	request, err := http.NewRequestWithContext(ctx, http.MethodPost, "/actions/v1/responses", bytes.NewReader(body))
	if err != nil {
		return nil, fmt.Errorf("build compat responses request: %w", err)
	}
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("CompartmentId", cred.TenancyOCID)
	request.Header.Set("opc-compartment-id", cred.TenancyOCID)
	response, err := client.Call(ctx, request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()
	payload, err := io.ReadAll(io.LimitReader(response.Body, compatResponsesLimit))
	if err != nil {
		return nil, fmt.Errorf("read compat responses body: %w", err)
	}
	return payload, nil
}

// GenAiCompatResponsesStream 实现 Client:以流式直通 OCI `/actions/v1/responses`,
// 建立成功(2xx)返回 SSE body(调用方负责 Close);建立失败返回 SDK ServiceError,
// 与既有渠道切换/熔断错误分类兼容。请求体须由调用方置 stream:true。
func (c *RealClient) GenAiCompatResponsesStream(ctx context.Context, cred Credentials, region string, body []byte) (io.ReadCloser, error) {
	ic, err := c.genAiInferenceClient(cred, region)
	if err != nil {
		return nil, err
	}
	client := ic.BaseClient
	common.UpdateEndpointTemplateForOptions(&client)
	common.SetMissingTemplateParams(&client)
	request, err := http.NewRequestWithContext(ctx, http.MethodPost, "/actions/v1/responses", bytes.NewReader(body))
	if err != nil {
		return nil, fmt.Errorf("build compat responses stream request: %w", err)
	}
	request.Header.Set("Content-Type", "application/json")
	request.Header.Set("CompartmentId", cred.TenancyOCID)
	request.Header.Set("opc-compartment-id", cred.TenancyOCID)
	response, err := client.Call(ctx, request)
	if err != nil {
		if response != nil && response.Body != nil {
			response.Body.Close()
		}
		return nil, err
	}
	return response.Body, nil
}