package flow

import (
	"ai-agent/workflow/model/dto"
	flowDto "ai-agent/workflow/model/dto/flow"
	"bytes"
	"context"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"regexp"
	"strconv"
	"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) (res *flowDto.GetIsChatModelRes, err 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)
	return
}

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) (res *flowDto.ComposeMessagesRes, err 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)
	return
}

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 BuildText(text string) string {
	// 生成单条HTML
	var htmlBuilder strings.Builder
	htmlBuilder.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", "PingFang SC", Arial, sans-serif;
            background: #f5f5f5;
            color: #333;
            line-height: 1.8;
            padding: 20px;
        }
        .container {
            max-width: 900px;
            margin: 0 auto;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
            overflow: hidden;
        }
        .item {
            padding: 30px;
        }
        .image-group {
            margin-bottom: 25px;
        }
        .image-group img {
            width: 100%;
            height: auto;
            display: block;
            margin-bottom: 15px;
            border-radius: 8px;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
        }
        .image-group img:last-child {
            margin-bottom: 0;
        }
        .text {
            padding: 0;
            font-size: 15px;
            line-height: 1.8;
            color: #555;
        }
        .text h2 {
            font-size: 28px;
            font-weight: bold;
            color: #1a1a1a;
            margin-bottom: 15px;
            line-height: 1.4;
        }
        .text h3 {
            font-size: 20px;
            font-weight: 600;
            color: #2c3e50;
            margin: 20px 0 12px;
            padding-left: 12px;
            border-left: 4px solid #409eff;
        }
        .text p {
            margin-bottom: 15px;
            text-align: justify;
        }
        .text strong {
            color: #e74c3c;
            font-weight: 600;
        }
        .text ul {
            list-style: none;
            padding: 0;
            margin: 15px 0;
        }
        .text ul li {
            padding: 10px 0 10px 30px;
            position: relative;
            line-height: 1.6;
        }
        .text ul li:before {
            content: "●";
            color: #409eff;
            font-size: 12px;
            position: absolute;
            left: 12px;
            top: 12px;
        }
        @media (max-width: 768px) {
            body {
                padding: 10px;
            }
            .item {
                padding: 20px;
            }
            .text h2 {
                font-size: 24px;
            }
            .text h3 {
                font-size: 18px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="item">
`)

	//// 写入图片（支持0张、1张、多张）
	//if len(images) > 0 {
	//	htmlBuilder.WriteString(`<div class="image-group">`)
	//	for _, imgUrl := range images {
	//		htmlBuilder.WriteString(fmt.Sprintf(`<img src="%s" alt="图片"/>`, imgUrl))
	//	}
	//	htmlBuilder.WriteString(`</div>`)
	//}

	// 🔥 写入文案前：删除 <p class="image-count">需要配图：X 张</p>
	if text != "" {
		// 正则删除整行
		imageTagRegex := regexp.MustCompile(`<p class="image-count">[\s\S]*?</p>`)
		//re := regexp.MustCompile(`<p class="image-count">需要配图：\d+ 张</p>`)
		cleanContent := imageTagRegex.ReplaceAllString(text, "")

		// 写入清理后的文案
		htmlBuilder.WriteString(fmt.Sprintf(`<div class="text">%s</div>`, cleanContent))
	}

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

	return htmlBuilder.String()
}

func BuildHtml(text string, images []string) string {
	var htmlBuilder strings.Builder
	htmlBuilder.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", sans-serif;
            padding: 20px;
            background-color: #f6f6f6;
            line-height: 1.7;
            font-size: 16px;
            color: #333;
        }
        .container {
            max-width: 750px;
            margin: 0 auto;
            background: #fff;
            padding: 30px;
            border-radius: 12px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
        }
        #content {
            white-space: pre-line;
        }
    </style>
</head>
<body>
    <div class="container">
`)
	// 写入图片（支持0张、1张、多张）
	if len(images) > 0 {
		htmlBuilder.WriteString(`<div class="image-group">`)
		for _, imgUrl := range images {
			htmlBuilder.WriteString(fmt.Sprintf(`<img src="%s" alt="图片"/>`, imgUrl))
		}
		htmlBuilder.WriteString(`</div>`)
	}

	htmlBuilder.WriteString(`
<div id="content">加载中...</div>
    </div>

    <script>
        const incUrl = "` + text + `";
        fetch(incUrl)
            .then(res => {
                if (!res.ok) throw new Error("加载失败");
                return res.text();
            })
            .then(text => {
                document.getElementById("content").textContent = text;
            })
            .catch(err => {
                document.getElementById("content").innerHTML = "加载失败：" + err.message;
            });
    </script>
</body>
</html>`)

	return htmlBuilder.String()
}

// ExtractImageCount 从 HTML 内容里提取图片数量（例如从 <p class="image-count">需要配图：3 张</p> 拿到 3）
func ExtractImageCount(content string) int {
	re := regexp.MustCompile(`<p class="image-count">[^\d]*(\d+)[^\d]*</p>`)
	match := re.FindStringSubmatch(content)
	if len(match) >= 2 {
		num, _ := strconv.Atoi(match[1])
		return num
	}
	return 0
}

// StripHtmlTags 去掉所有HTML标签，保留换行和文本结构，并删除配图标记行
func StripHtmlTags(html string, delImageCount bool) string {
	if delImageCount {
		// 🔥 第一步：直接删除整个 <p class="image-count">...</p> 标签（包含内容）
		imageTagRegex := regexp.MustCompile(`<p class="image-count">[\s\S]*?</p>`)
		html = imageTagRegex.ReplaceAllString(html, "")
	}

	// 1. 替换块级标签为换行，保证排版
	blockTags := regexp.MustCompile(`</?(div|p|h1|h2|h3|h4|h5|h6|li|ul|ol|br|tr|td|th)[^>]*>`)
	text := blockTags.ReplaceAllString(html, "\n")

	// 2. 去掉所有剩余的 HTML 标签
	allTags := regexp.MustCompile(`<[^>]+>`)
	text = allTags.ReplaceAllString(text, "")

	// 4. 清理多余空行（多个换行只保留一个）
	text = regexp.MustCompile(`\n\s*\n`).ReplaceAllString(text, "\n")

	// 5. 只去掉首尾空白，中间换行保留
	text = strings.TrimSpace(text)

	return text
}

// SplitMultiContents 拆分模型返回的多条文案（基于HTML标签分隔）
func SplitMultiContents(htmlContent string) []string {
	var contents []string
	// 正则匹配<div class="content-item" id="content-{序号}">包裹的内容
	re := regexp.MustCompile(`<div class="content-item" id="content-\d+">([\s\S]*?)</div>`)
	matches := re.FindAllStringSubmatch(htmlContent, -1)
	for _, match := range matches {
		if len(match) > 1 {
			// 清理空内容
			trimmed := strings.TrimSpace(match[1])
			if trimmed != "" {
				contents = append(contents, trimmed)
			}
		}
	}
	// 兜底：如果没有匹配到结构化内容，按换行/分隔符拆分
	if len(contents) == 0 {
		contents = strings.Split(htmlContent, "===分隔符===") // 提示词中可新增此兜底规则
	}
	return contents
}