package services

import (
	"encoding/json"
	"fmt"
	"fwh-toolbox-server/dto"
	"fwh-toolbox-server/repositories"
	"io"
	"net/http"
	"regexp"
	"strings"
	"time"

	"github.com/google/uuid"
	"go.uber.org/zap"
)

// FeedbackHistoryItem 返回给前端的历史记录条目
type FeedbackHistoryItem struct {
	Id        string `json:"id"`
	Title     string `json:"title"`
	Type      string `json:"type"`      // bug / feature
	Status    int    `json:"status"`    // -2 Pending, -1 Rejected, 0 Snoozed, 1 Accepted, 2 Duplicate
	Priority  string `json:"priority"`
	CreatedAt string `json:"createdAt"`
	CreatedBy string `json:"createdBy"` // 提交人用户名
}

// SubmitFeedback 提交反馈到 Plane Intake (V2 Web API)
// 流程：1. 构造HTML（含image-component） → 2. 创建IntakeIssue → 3. 绑定Asset到Issue
func SubmitFeedback(body dto.FeedbackSubmitDTO, userName string) (*repositories.PlaneWebIntakeIssueResponse, error) {
	// 构造标题（包含提交人标识，供历史查询时解析）
	var prefix string
	if body.Type == "bug" {
		prefix = "[Bug]"
	} else {
		prefix = "[Feature]"
	}
	title := fmt.Sprintf("%s %s 「%s」", prefix, body.Title, userName)

	// 构造描述 HTML（附件使用 image-component 格式）
	descHTML := buildDescriptionHTML(body, userName)

	// 选择 Label（始终添加 Feedback 标签 + 类型标签）
	var labelIds []string
	if repositories.Plane.LabelFeedbackId != "" {
		labelIds = append(labelIds, repositories.Plane.LabelFeedbackId)
	}
	if body.Type == "bug" && repositories.Plane.LabelBugId != "" {
		labelIds = append(labelIds, repositories.Plane.LabelBugId)
	} else if body.Type == "feature" && repositories.Plane.LabelFeatureId != "" {
		labelIds = append(labelIds, repositories.Plane.LabelFeatureId)
	}

	// 映射优先级
	priority := mapPriority(body.Priority)

	// 构造请求体 (Plane V2 Web API)
	req := repositories.PlaneWebIntakeIssueRequest{
		Name:            title,
		DescriptionHTML: descHTML,
		Priority:        priority,
		LabelIDs:        labelIds,
	}

	// 调用 Plane V2 Web Intake API 创建Issue
	result, err := repositories.Plane.CreateIntakeIssue(req)
	if err != nil {
		return nil, err
	}

	issueId := result.Issue.ID

	// 创建成功后，如果有附件，将 Asset 绑定到 Issue Entity
	if len(body.AssetIds) > 0 {

		if err := repositories.Plane.BindAssetsToEntity(issueId, body.AssetIds); err != nil {
			// 绑定失败不阻塞整体提交，但记录警告
			zap.L().Warn("[Feedback] 绑定附件到Issue失败",
				zap.String("issueId", issueId),
				zap.Strings("assetIds", body.AssetIds),
				zap.Error(err),
			)
		} else {
			zap.L().Info("[Feedback] 附件绑定成功",
				zap.String("issueId", issueId),
				zap.Int("assetCount", len(body.AssetIds)),
			)
		}
	}

	zap.L().Info("[Feedback] 提交成功",
		zap.String("issueId", issueId),
		zap.String("user", userName),
		zap.String("type", body.Type),
		zap.String("title", body.Title),
	)

	return result, nil
}

// buildDescriptionHTML 构造提交描述的 HTML
// 附件使用 Plane 原生 <image-component> 格式，放在文本最后
func buildDescriptionHTML(body dto.FeedbackSubmitDTO, userName string) string {
	var sb strings.Builder

	sb.WriteString(fmt.Sprintf(`<p class="editor-paragraph-block"><strong>提交人：</strong>%s</p>`, userName))
	sb.WriteString(fmt.Sprintf(`<p class="editor-paragraph-block"><strong>分类：</strong>%s</p>`, body.Category))

	if body.RelatedPage != nil && *body.RelatedPage != "" {
		sb.WriteString(fmt.Sprintf(`<p class="editor-paragraph-block"><strong>相关页面：</strong>%s</p>`, *body.RelatedPage))
	}

	sb.WriteString("<hr/>")

	if body.Type == "bug" {
		// Bug Report
		if body.Steps != nil && *body.Steps != "" {
			sb.WriteString(fmt.Sprintf(`<h3>复现步骤</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(*body.Steps, "\n", "<br/>")))
		}
		if body.Expected != nil && *body.Expected != "" {
			sb.WriteString(fmt.Sprintf(`<h3>期望结果</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(*body.Expected, "\n", "<br/>")))
		}
		if body.Actual != nil && *body.Actual != "" {
			sb.WriteString(fmt.Sprintf(`<h3>实际结果</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(*body.Actual, "\n", "<br/>")))
		}
		if body.Description != "" {
			sb.WriteString(fmt.Sprintf(`<h3>补充说明</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(body.Description, "\n", "<br/>")))
		}
	} else {
		// Feature Request
		if body.Description != "" {
			sb.WriteString(fmt.Sprintf(`<h3>需求描述</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(body.Description, "\n", "<br/>")))
		}
		if body.Scenario != nil && *body.Scenario != "" {
			sb.WriteString(fmt.Sprintf(`<h3>使用场景</h3><p class="editor-paragraph-block">%s</p>`, strings.ReplaceAll(*body.Scenario, "\n", "<br/>")))
		}
	}

	// 附件放在最后，带"附件"大标题
	if len(body.AssetIds) > 0 {
		sb.WriteString(`<h3>附件</h3>`)
		for _, assetId := range body.AssetIds {
			dataId := uuid.New().String()
			sb.WriteString(fmt.Sprintf(
				`<image-component data-id="%s" src="%s" id="%s" width="35%%" alignment="left" status="uploaded"></image-component>`,
				dataId, assetId, dataId,
			))
		}
	}

	return sb.String()
}

// GetFeedbackHistory 查询 Plane Intake 列表 (V2 Web API)
// 只返回带有 Feedback 标签的记录，包含所有状态（Pending/Accepted/Rejected/Snoozed/Duplicate）
func GetFeedbackHistory(userName string) ([]FeedbackHistoryItem, error) {
	// 查询所有状态的 Intake 记录：-2 Pending, -1 Rejected, 0 Snoozed, 1 Accepted, 2 Duplicate
	data, err := repositories.Plane.ListIntakeIssues("-2,-1,0,1,2")
	if err != nil {
		return nil, err
	}

	feedbackLabelId := repositories.Plane.LabelFeedbackId

	// V2 返回的是 raw JSON，直接解析
	type intakeItem struct {
		Status int `json:"status"`
		Issue  struct {
			ID        string   `json:"id"`
			Name      string   `json:"name"`
			Priority  string   `json:"priority"`
			LabelIDs  []string `json:"label_ids"`
			CreatedAt string   `json:"created_at"`
			CreatedBy string   `json:"created_by"`
		} `json:"issue"`
	}

	var items []intakeItem
	if err := json.Unmarshal(data, &items); err != nil {
		// 可能是分页格式
		var paged struct {
			Results []intakeItem `json:"results"`
		}
		if err2 := json.Unmarshal(data, &paged); err2 != nil {
			return nil, fmt.Errorf("解析Intake列表失败: %w", err)
		}
		items = paged.Results
	}

	result := []FeedbackHistoryItem{}
	for _, item := range items {
		// 只显示带有 Feedback 标签的记录
		if feedbackLabelId != "" && !containsLabel(item.Issue.LabelIDs, feedbackLabelId) {
			continue
		}
		result = append(result, FeedbackHistoryItem{
			Id:        item.Issue.ID,
			Title:     cleanTitle(item.Issue.Name),
			Type:      extractType(item.Issue.Name),
			Status:    item.Status,
			Priority:  item.Issue.Priority,
			CreatedAt: item.Issue.CreatedAt,
			CreatedBy: extractCreator(item.Issue.Name),
		})
	}

	return result, nil
}

// extractCreator 从标题中提取提交人（格式：[Type] title 「username」）
func extractCreator(title string) string {
	start := strings.LastIndex(title, "「")
	end := strings.LastIndex(title, "」")
	if start >= 0 && end > start {
		return title[start+len("「") : end]
	}
	return ""
}

// extractType 从标题中提取类型
func extractType(title string) string {
	if strings.HasPrefix(title, "[Bug]") {
		return "bug"
	}
	if strings.HasPrefix(title, "[Feature]") {
		return "feature"
	}
	return ""
}

// cleanTitle 从标题中移除类型前缀和提交人后缀，返回纯标题
func cleanTitle(title string) string {
	// 移除 [Bug] 或 [Feature] 前缀
	title = strings.TrimPrefix(title, "[Bug] ")
	title = strings.TrimPrefix(title, "[Feature] ")
	// 移除末尾的 「username」
	if idx := strings.LastIndex(title, " 「"); idx >= 0 {
		title = title[:idx]
	}
	return title
}

// containsLabel 判断标签列表中是否包含指定标签
func containsLabel(labels []string, target string) bool {
	for _, l := range labels {
		if l == target {
			return true
		}
	}
	return false
}

// FeedbackDetailResult 反馈详情
type FeedbackDetailResult struct {
	Id              string                `json:"id"`
	Title           string                `json:"title"`
	DescriptionHTML string                `json:"descriptionHtml"`
	Priority        string                `json:"priority"`
	Status          int                   `json:"status"`
	CreatedAt       string                `json:"createdAt"`
	Attachments     []FeedbackAttachment  `json:"attachments"`
}

// FeedbackAttachment 附件信息
type FeedbackAttachment struct {
	AssetId string `json:"assetId"`
}

// GetFeedbackDetail 获取单条反馈详情（含 description_html 和附件 ID 列表）
func GetFeedbackDetail(issueId string) (*FeedbackDetailResult, error) {

	data, err := repositories.Plane.GetIntakeIssue(issueId)
	if err != nil {
		return nil, err
	}

	var detail struct {
		Status int `json:"status"`
		Issue  struct {
			ID              string `json:"id"`
			Name            string `json:"name"`
			DescriptionHTML string `json:"description_html"`
			Priority        string `json:"priority"`
			CreatedAt       string `json:"created_at"`
		} `json:"issue"`
	}
	if err := json.Unmarshal(data, &detail); err != nil {
		return nil, fmt.Errorf("解析反馈详情失败: %w", err)
	}

	// 从 description_html 中提取 image-component 的 asset ID
	attachments := extractAttachmentIds(detail.Issue.DescriptionHTML)

	// 清理 description_html 中的 image-component 标签（附件单独展示）
	cleanedHTML := removeImageComponents(detail.Issue.DescriptionHTML)

	return &FeedbackDetailResult{
		Id:              detail.Issue.ID,
		Title:           cleanTitle(detail.Issue.Name),
		DescriptionHTML: cleanedHTML,
		Priority:        detail.Issue.Priority,
		Status:          detail.Status,
		CreatedAt:       detail.Issue.CreatedAt,
		Attachments:     attachments,
	}, nil
}

// imageComponentSrcRegex 匹配 <image-component ... src="assetId" ...>...</image-component>
var imageComponentSrcRegex = regexp.MustCompile(`<image-component[^>]+src="([0-9a-f-]{36})"[^>]*>.*?</image-component>`)

// extractAttachmentIds 从 description_html 中提取附件 asset ID 列表
func extractAttachmentIds(html string) []FeedbackAttachment {
	matches := imageComponentSrcRegex.FindAllStringSubmatch(html, -1)
	if len(matches) == 0 {
		return nil
	}

	var attachments []FeedbackAttachment
	for _, match := range matches {
		attachments = append(attachments, FeedbackAttachment{AssetId: match[1]})
	}
	return attachments
}

// removeImageComponents 移除 description_html 中的 image-component 标签
func removeImageComponents(html string) string {
	return imageComponentSrcRegex.ReplaceAllString(html, "")
}

// mapPriority 映射优先级到 Plane 格式
func mapPriority(priority string) string {
	switch priority {
	case "urgent":
		return "urgent"
	case "high":
		return "high"
	case "medium":
		return "medium"
	case "low":
		return "low"
	default:
		return "none"
	}
}

// UploadFeedbackAsset 通过 Plane V2 Assets API 上传文件
func UploadFeedbackAsset(fileName string, contentType string, fileSize int64, fileData []byte) (*repositories.PlaneWebAssetUploadResult, error) {
	return repositories.Plane.UploadProjectAsset(fileName, contentType, fileData, repositories.PlaneWebEntityIssueDescription)
}

// ProxyFeedbackAsset 代理获取附件文件（后端从 Plane 下载后返回给前端）
func ProxyFeedbackAsset(assetId string) (string, []byte, error) {

	// 获取预签名 URL
	presignedURL, err := repositories.Plane.GetProjectAssetURL(assetId)
	if err != nil {
		return "", nil, fmt.Errorf("获取附件URL失败: %w", err)
	}

	// 下载文件
	resp, err := httpGet(presignedURL)
	if err != nil {
		return "", nil, fmt.Errorf("下载附件失败: %w", err)
	}

	return resp.ContentType, resp.Body, nil
}

// DeleteFeedbackAsset 删除已上传的附件 (V2)
func DeleteFeedbackAsset(assetId string) error {
	return repositories.Plane.DeleteProjectAsset(assetId)
}

// httpGetResponse HTTP GET 响应
type httpGetResponse struct {
	ContentType string
	Body        []byte
}

// httpGet 简单 HTTP GET 请求（用于下载预签名 URL 的文件）
func httpGet(url string) (*httpGetResponse, error) {
	client := &http.Client{Timeout: 60 * time.Second}
	resp, err := client.Get(url)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return nil, fmt.Errorf("HTTP GET 失败: status=%d", resp.StatusCode)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("读取响应失败: %w", err)
	}

	contentType := resp.Header.Get("Content-Type")
	if contentType == "" {
		contentType = "application/octet-stream"
	}

	return &httpGetResponse{
		ContentType: contentType,
		Body:        body,
	}, nil
}