package flow

import (
	"ai-agent/workflow/model/dto"
	flowDto "ai-agent/workflow/model/dto/flow"
	"bytes"
	"context"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"strings"

	commonHttp "gitea.com/red-future/common/http"
	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

func GetIsChatModel(ctx context.Context) (*flowDto.GetIsChatModelRes, error) {
	headers := make(map[string]string)
	if r := g.RequestFromCtx(ctx); r != nil {
		for k, v := range r.Request.Header {
			if len(v) > 0 {
				headers[k] = v[0]
			}
		}
	}
	res := new(flowDto.GetIsChatModelRes)
	err := commonHttp.Get(ctx, "model-gateway/model/getIsChatModel", headers, res, nil)
	if err != nil {
		return nil, err
	}

	return res, nil
}

func CreateGatewayTask(ctx context.Context, req *flowDto.CreateTaskReq) (string, error) {
	headers := make(map[string]string)
	if r := g.RequestFromCtx(ctx); r != nil {
		for k, v := range r.Request.Header {
			if len(v) > 0 {
				headers[k] = v[0]
			}
		}
	}
	res := new(flowDto.CreateTaskRes)
	err := commonHttp.Post(ctx, "model-gateway/task/createTask", headers, res, &req)
	if err != nil {
		return "", err
	}

	return res.TaskId, nil
}

func ComposeMessages(ctx context.Context, req *flowDto.ComposeMessagesReq) (*flowDto.ComposeMessagesRes, error) {
	headers := make(map[string]string)
	if r := g.RequestFromCtx(ctx); r != nil {
		for k, v := range r.Request.Header {
			if len(v) > 0 {
				headers[k] = v[0]
			}
		}
	}
	res := new(flowDto.ComposeMessagesRes)
	err := commonHttp.Post(ctx, "prompts-core/prompt/composeMessages", headers, res, &req)
	if err != nil {
		return nil, err
	}

	return res, nil
}

func GatewayTask(ctx context.Context, epicycleId int64, model string, content map[string]any) (any, error) {
	modelTaskId, err := CreateGatewayTask(ctx, &flowDto.CreateTaskReq{
		ModelName:      model,
		BizName:        g.Cfg().MustGet(ctx, "server.name").String(),
		CallbackUrl:    "/flow/execution/modelCallback",
		RequestPayload: content,
		EpicycleId:     epicycleId,
	})
	if err != nil {
		return nil, err
	}
	return Wait(ctx, modelTaskId)
}

func GetTaskResult(ctx context.Context, result any) (*flowDto.TaskCallback, error) {
	task := new(flowDto.TaskCallback)
	if err := gconv.Struct(result, task); err != nil {
		return nil, err
	}

	url, err := utils.GetFileAddressPrefix(ctx)
	if err != nil {
		return nil, err
	}

	// 获取远程文件内容
	file, err := FetchRemoteJsonFile(ctx, url+task.OssFile)
	if err != nil {
		return nil, err
	}

	task.Text = gconv.String(file)

	return task, nil
}

func FetchRemoteJsonFile(ctx context.Context, fileUrl string) ([]byte, error) {
	// 1. 下载文件
	resp, err := g.Client().Get(ctx, fileUrl)
	if err != nil {
		return nil, fmt.Errorf("get file failed: %w", err)
	}
	defer resp.Close()

	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("http status error: %d", resp.StatusCode)
	}

	return io.ReadAll(resp.Body)
}

func GetImageBytesFromURL(url string) (all []byte, contentType string, err error) {
	resp, err := http.Get(url)
	if err != nil {
		return
	}
	defer resp.Body.Close()
	all, err = io.ReadAll(resp.Body)
	if err != nil {
		return
	}
	contentType = resp.Header.Get("Content-Type")
	return
}

func Upload(ctx context.Context, req *dto.UploadFileBytesReq) (*dto.UploadFileBytesRes, error) {
	body := &bytes.Buffer{}
	writer := multipart.NewWriter(body)

	part, err := writer.CreateFormFile("file", req.FileName)
	if err != nil {
		return nil, err
	}
	if _, err = part.Write(req.FileBytes); err != nil {
		return nil, err
	}
	if err = writer.Close(); err != nil {
		return nil, err
	}

	headers := make(map[string]string)
	headers["Content-Type"] = writer.FormDataContentType()
	if r := g.RequestFromCtx(ctx); r != nil {
		if auth := r.Header.Get("Authorization"); auth != "" {
			headers["Authorization"] = auth
		}
	}

	// 发起上传请求
	res := &dto.UploadFileBytesRes{}
	url := "oss/file/uploadFile"
	if err = commonHttp.Post(ctx, url, headers, res, body.Bytes()); err != nil {
		return nil, err
	}

	g.Log().Infof(ctx, "[Upload] success url=%s size=%d", res.FileURL, res.FileSize)
	return res, nil
}

func buildMergeHtml(texts []string, images []string) string {
	html := strings.Builder{}

	html.WriteString(`
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: "Microsoft YaHei", Arial, sans-serif;
            background: #fff;
            color: #333;
        }
        .container {
            max-width: 960px;
            margin: 0 auto;
        }
        /* 图片：完全贴边，无额外间距 */
        .image-block {
            width: 100%;
            margin: 0;
            padding: 0;
        }
        .image-block img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: 0;
        }
        /* 文案：极致紧凑 */
        .text-block {
            margin: 0;
            padding: 16px; /* 仅保留内边距，不设外边距 */
            line-height: 1.6;
            font-size: 14px;
            color: #444;
            white-space: pre-wrap;
        }
        /* 分割线：完全去掉，改用内边距自然分隔 */
    </style>
</head>
<body>
    <div class="container">
`)

	// 1. 先渲染图片（无任何上下边距，占满宽度）
	if len(images) > 0 {
		html.WriteString(`<div class="image-block">`)
		for _, img := range images {
			html.WriteString(fmt.Sprintf(`<img src="%s" alt="" />`, img))
		}
		html.WriteString(`</div>`)
	}

	// 2. 渲染文案（紧贴图片下方，仅用内边距留白）
	if len(texts) > 0 {
		html.WriteString(`<div class="text-block">`)
		// 段落之间用 <br> 而不是 <br><br>，减少空行
		html.WriteString(strings.Join(texts, "<br>"))
		html.WriteString(`</div>`)
	}

	html.WriteString(`
    </div>
</body>
</html>
`)

	return html.String()
}