package draft

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
	"regexp"
	"sort"
	"strings"
	"time"

	"github.com/aisim/kb-cli/internal/index"
	"github.com/aisim/kb-cli/internal/llm"
	"github.com/aisim/kb-cli/internal/search"
)

// Intake 草稿录入器
type Intake struct {
	vaultPath string
	llmClient *llm.Client
	store     *index.Store
}

// DraftInfo 草稿信息（用于 list 输出）
type DraftInfo struct {
	Filepath     string `json:"filepath"`
	Filename     string `json:"filename"`
	Title        string `json:"title,omitempty"`
	Status       string `json:"status,omitempty"`
	Type         string `json:"type,omitempty"`
	Created      string `json:"created,omitempty"`
	HasMergeHint bool   `json:"has_merge_hint"`
}

// DraftMeta 草稿元数据
type DraftMeta struct {
	Title   string   `yaml:"title"`
	Type    string   `yaml:"type"`
	Status  string   `yaml:"status"`
	Source  string   `yaml:"source,omitempty"`
	Tags    []string `yaml:"tags"`
	Created string   `yaml:"created"`
}

// Counter 计数器
type Counter struct {
	Week    string `json:"week"`
	Next    int    `json:"next"`
	ResetDay string `json:"reset_day"`
	LastUpdated string `json:"last_updated"`
}

// UnmarshalJSON 自定义反序列化，兼容 week 字段为数字或字符串
func (c *Counter) UnmarshalJSON(data []byte) error {
	type Alias Counter
	aux := &struct {
		Week interface{} `json:"week"`
		*Alias
	}{
		Alias: (*Alias)(c),
	}
	if err := json.Unmarshal(data, aux); err != nil {
		return err
	}
	switch v := aux.Week.(type) {
	case float64:
		c.Week = fmt.Sprintf("%d", int(v))
	case string:
		c.Week = v
	}
	return nil
}

// NewIntake 创建草稿录入器
func NewIntake(vaultPath string, store *index.Store) *Intake {
	// 展开 ~ 为实际的用户目录
	if strings.HasPrefix(vaultPath, "~/") {
		if home, err := os.UserHomeDir(); err == nil {
			vaultPath = filepath.Join(home, vaultPath[2:])
		}
	}
	
	return &Intake{
		vaultPath: vaultPath,
		llmClient: llm.NewClient(),
		store:     store,
	}
}

// CreateDraft 创建草稿
func (i *Intake) CreateDraft(draftType, title, content, source string, force bool) error {
	// 1. 调用 LLM 提取 tags
	fmt.Println("正在提取 tags...")
	extractResult, err := i.llmClient.ExtractTags(content)
	if err != nil {
		return fmt.Errorf("提取 tags 失败: %w", err)
	}
	fmt.Printf("提取到 %d 个 tags: %v\n", len(extractResult.Tags), extractResult.Tags)

	// 2. 使用 tags 搜索知识库
	fmt.Println("正在搜索相关文档...")
	candidates, err := i.searchByTags(extractResult.Tags)
	if err != nil {
		return fmt.Errorf("搜索知识库失败: %w", err)
	}
	fmt.Printf("找到 %d 个相关文档\n", len(candidates))

	// 3. 调用 LLM 生成合并指示
	var mergeHint *llm.MergeHint
	if len(candidates) > 0 {
		fmt.Println("正在生成合并指示...")
		dirStructure := i.scanDirectoryStructure()
		mergeHint, err = i.llmClient.GenerateMergeHint(content, candidates, dirStructure)
		if err != nil {
			fmt.Printf("警告: 生成合并指示失败: %v\n", err)
			mergeHint = nil
		}
	}

	// 4. 创建草稿目录和文件
	draftDir, err := i.createDraftDir(draftType, title, content, source, extractResult.Tags, force)
	if err != nil {
		return fmt.Errorf("创建草稿目录失败: %w", err)
	}

	// 5. 写入 merge.md（无论是否有候选文档都生成）
	if mergeHint != nil {
		if err := i.writeMergeHint(draftDir, mergeHint, candidates); err != nil {
			fmt.Printf("警告: 写入合并指示失败: %v\n", err)
		}
	} else {
		// 没有候选文档时，生成默认的 merge.md
		if err := i.writeDefaultMergeHint(draftDir); err != nil {
			fmt.Printf("警告: 写入默认合并指示失败: %v\n", err)
		}
	}

	fmt.Printf("草稿创建成功: %s\n", draftDir)
	return nil
}

// searchByTags 使用 tags 搜索知识库
func (i *Intake) searchByTags(tags []string) ([]llm.SearchCandidate, error) {
	if len(tags) == 0 {
		return nil, nil
	}

	// 使用所有 tags 作为关键词搜索，使用 OR 逻辑（任意一个匹配即可）
	// 这样即使某些 tag 匹配不到，其他 tag 也能找到结果
	opts := search.SearchOptions{
		TopN:        3,
		WithContent: true, // 需要内容给 LLM 评估
	}

	results, err := search.Search(i.store, tags, opts)
	if err != nil {
		// 如果搜索失败，尝试逐个 tag 搜索，返回第一个有结果的
		for _, tag := range tags {
			singleResults, singleErr := search.Search(i.store, []string{tag}, opts)
			if singleErr == nil && len(singleResults) > 0 {
				results = singleResults
				break
			}
		}
		if len(results) == 0 {
			return nil, nil // 所有 tag 都搜索失败，返回空而不是错误
		}
	}

	candidates := make([]llm.SearchCandidate, 0, len(results))
	for _, r := range results {
		// 截取前5000字给 LLM 评估
		content := r.Content
		if len(content) > 5000 {
			content = content[:5000] + "\n...(内容已截断)"
		}
		candidates = append(candidates, llm.SearchCandidate{
			Title:   r.Title,
			Path:    r.Path,
			Score:   float64(r.Score),
			Content: content,
		})
	}

	return candidates, nil
}

// createDraftDir 创建草稿目录和文件
func (i *Intake) createDraftDir(draftType, title, content, source string, tags []string, force bool) (string, error) {
	// 确定子目录
	subDir := i.getSubDir(draftType)
	reviewDir := filepath.Join(i.vaultPath, "待审阅", subDir)

	// 检查是否已存在相同标题的草稿
	if !force {
		if err := i.checkDuplicate(reviewDir, title); err != nil {
			return "", err
		}
	}

	// 获取下一个编号
	seq, err := i.getNextSeq(reviewDir)
	if err != nil {
		return "", fmt.Errorf("获取编号失败: %w", err)
	}

	// 生成目录名
	now := time.Now()
	dateStr := now.Format("20060102")
	safeTitle := i.sanitizeTitle(title)
	dirName := fmt.Sprintf("%03d-%s-%s", seq, dateStr, safeTitle)
	draftDir := filepath.Join(reviewDir, dirName)

	// 创建目录
	if err := os.MkdirAll(draftDir, 0755); err != nil {
		return "", fmt.Errorf("创建目录失败: %w", err)
	}

	// 写入 draft.md
	draftPath := filepath.Join(draftDir, "draft.md")
	if err := i.writeDraftFile(draftPath, title, draftType, source, tags, content); err != nil {
		return "", fmt.Errorf("写入 draft.md 失败: %w", err)
	}

	return draftDir, nil
}

// getSubDir 获取子目录名
func (i *Intake) getSubDir(draftType string) string {
	typeMap := map[string]string{
		"售后": "售后提取",
		"产品": "产品提取",
		"运营": "运营提取",
		"行业": "行业提取",
		"TAPD": "TAPD提取",
	}
	if subDir, ok := typeMap[draftType]; ok {
		return subDir
	}
	return "沟通提取"
}

// checkDuplicate 检查重复
func (i *Intake) checkDuplicate(reviewDir, title string) error {
	entries, err := os.ReadDir(reviewDir)
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}
		return err
	}

	safeTitle := i.sanitizeTitle(title)
	for _, entry := range entries {
		if !entry.IsDir() {
			continue
		}
		// 检查目录名是否包含相同标题
		if strings.Contains(entry.Name(), safeTitle) {
			return fmt.Errorf("待审阅区已存在相同标题的草稿: %s，使用 --force 强制创建", entry.Name())
		}
	}

	return nil
}

// getNextSeq 获取下一个编号
func (i *Intake) getNextSeq(reviewDir string) (int, error) {
	// 读取 counter.json
	counterPath := filepath.Join(i.vaultPath, "待审阅", "counter.json")
	counter, err := i.readCounter(counterPath)
	if err != nil {
		// 如果不存在，从目录中推断
		return i.inferNextSeq(reviewDir)
	}

	// 检查是否需要重置（每周重置）
	now := time.Now()
	currentWeek := i.getWeekNumber(now)
	if counter.Week != currentWeek {
		counter.Week = currentWeek
		counter.Next = 1
		counter.ResetDay = now.Format("2006-01-02")
	}

	nextSeq := counter.Next
	counter.Next++
	counter.LastUpdated = now.Format(time.RFC3339)

	// 写回 counter.json
	if err := i.writeCounter(counterPath, counter); err != nil {
		return 0, fmt.Errorf("更新计数器失败: %w", err)
	}

	return nextSeq, nil
}

// readCounter 读取计数器
func (i *Intake) readCounter(path string) (*Counter, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}

	var counter Counter
	if err := json.Unmarshal(data, &counter); err != nil {
		return nil, err
	}

	return &counter, nil
}

// writeCounter 写入计数器
func (i *Intake) writeCounter(path string, counter *Counter) error {
	data, err := json.MarshalIndent(counter, "", "  ")
	if err != nil {
		return err
	}

	return os.WriteFile(path, data, 0644)
}

// inferNextSeq 从目录推断下一个编号
func (i *Intake) inferNextSeq(reviewDir string) (int, error) {
	entries, err := os.ReadDir(reviewDir)
	if err != nil {
		if os.IsNotExist(err) {
			return 1, nil
		}
		return 0, err
	}

	maxSeq := 0
	re := regexp.MustCompile(`^(\d{3})-`)
	for _, entry := range entries {
		if !entry.IsDir() {
			continue
		}
		matches := re.FindStringSubmatch(entry.Name())
		if len(matches) > 1 {
			var seq int
			fmt.Sscanf(matches[1], "%d", &seq)
			if seq > maxSeq {
				maxSeq = seq
			}
		}
	}

	return maxSeq + 1, nil
}

// getWeekNumber 获取周数（返回纯数字周数，与 counter.json 格式一致）
func (i *Intake) getWeekNumber(t time.Time) string {
	_, week := t.ISOWeek()
	return fmt.Sprintf("%d", week)
}

// sanitizeTitle 清理标题
func (i *Intake) sanitizeTitle(title string) string {
	// 替换不安全字符
	re := regexp.MustCompile(`[\\/:*?"<>|\s]`)
	safe := re.ReplaceAllString(title, "_")
	// 限制长度
	if len(safe) > 50 {
		safe = safe[:50]
	}
	return safe
}

// writeDraftFile 写入 draft.md
func (i *Intake) writeDraftFile(path, title, draftType, source string, tags []string, content string) error {
	now := time.Now().Format("2006-01-02 15:04:05")

	// 构建 frontmatter
	meta := DraftMeta{
		Title:   title,
		Type:    draftType,
		Status:  "draft",
		Source:  source,
		Tags:    tags,
		Created: now,
	}

	var sb strings.Builder
	sb.WriteString("---\n")
	sb.WriteString(fmt.Sprintf("title: %q\n", meta.Title))
	sb.WriteString(fmt.Sprintf("type: %q\n", meta.Type))
	sb.WriteString(fmt.Sprintf("status: %q\n", meta.Status))
	if meta.Source != "" {
		sb.WriteString(fmt.Sprintf("source: %q\n", meta.Source))
	}
	sb.WriteString("tags: [")
	for i, tag := range meta.Tags {
		if i > 0 {
			sb.WriteString(", ")
		}
		sb.WriteString(fmt.Sprintf("%q", tag))
	}
	sb.WriteString("]\n")
	sb.WriteString(fmt.Sprintf("created: %q\n", meta.Created))
	sb.WriteString("---\n\n")
	sb.WriteString(content)

	return os.WriteFile(path, []byte(sb.String()), 0644)
}

// writeMergeHint 写入 merge.md
func (i *Intake) writeMergeHint(draftDir string, hint *llm.MergeHint, candidates []llm.SearchCandidate) error {
	mergePath := filepath.Join(draftDir, "merge.md")
	now := time.Now().Format("2006-01-02 15:04:05")

	var sb strings.Builder
	sb.WriteString("---\n")
	sb.WriteString(fmt.Sprintf("generated_at: %q\n", now))
	sb.WriteString(fmt.Sprintf("confidence: %q\n", hint.Recommendation.Confidence))
	sb.WriteString("---\n\n")

	sb.WriteString("## 合并指示\n\n")
	sb.WriteString(fmt.Sprintf("**操作类型**: %s\n", hint.Recommendation.Action))
	sb.WriteString(fmt.Sprintf("**目标**: %s\n", hint.Recommendation.Target))
	sb.WriteString(fmt.Sprintf("**理由**: %s\n\n", hint.Recommendation.Reason))

	sb.WriteString("## 依据\n\n")
	sb.WriteString("### 搜索到的相关文档（Top 3）\n\n")
	for i, cand := range candidates {
		sb.WriteString(fmt.Sprintf("%d. **%s** (相似度: %.2f)\n", i+1, cand.Title, cand.Score))
		sb.WriteString(fmt.Sprintf("   - 路径: `%s`\n\n", cand.Path))
	}

	sb.WriteString("## LLM 判断\n\n")
	for _, a := range hint.Analysis {
		sb.WriteString(fmt.Sprintf("- **%s**: %s - %s\n", a.Path, a.Relevance, a.Reason))
	}

	return os.WriteFile(mergePath, []byte(sb.String()), 0644)
}

// writeDefaultMergeHint 写入默认的 merge.md（当没有候选文档时）
func (i *Intake) writeDefaultMergeHint(draftDir string) error {
	mergePath := filepath.Join(draftDir, "merge.md")
	now := time.Now().Format("2006-01-02 15:04:05")

	var sb strings.Builder
	sb.WriteString("---\n")
	sb.WriteString(fmt.Sprintf("generated_at: %q\n", now))
	sb.WriteString("confidence: \"low\"\n")
	sb.WriteString("---\n\n")

	sb.WriteString("## 合并指示\n\n")
	sb.WriteString("**操作类型**: new\n")
	sb.WriteString("**目标**: 新建独立文档\n")
	sb.WriteString("**理由**: 未找到相关文档，建议新建\n\n")

	sb.WriteString("## 依据\n\n")
	sb.WriteString("### 搜索到的相关文档\n\n")
	sb.WriteString("未找到相关文档。\n\n")

	sb.WriteString("## 建议\n\n")
	sb.WriteString("审阅时请根据草稿内容确定合适的分类和存放位置。\n")

	return os.WriteFile(mergePath, []byte(sb.String()), 0644)
}

// scanDirectoryStructure 扫描知识库目录结构，返回格式化的目录树字符串
func (i *Intake) scanDirectoryStructure() string {
	// 知识库根目录下的主要分类目录
	topDirs := []string{
		"电子秤平台",
		"运营管理平台",
		"第三方平台",
		"共有硬件",
		"通用",
	}

	var sb strings.Builder
	for _, topDir := range topDirs {
		dirPath := filepath.Join(i.vaultPath, topDir)
		entries, err := os.ReadDir(dirPath)
		if err != nil {
			continue
		}
		for _, entry := range entries {
			if entry.IsDir() {
				sb.WriteString(fmt.Sprintf("%s/%s/\n", topDir, entry.Name()))
			}
		}
	}

	return sb.String()
}

// RebuildTags 批量重建 tags
func (i *Intake) RebuildTags(limit int, dryRun bool) error {
	// 扫描知识库所有 .md 文件
	files, err := i.scanMarkdownFiles()
	if err != nil {
		return fmt.Errorf("扫描文件失败: %w", err)
	}

	if limit > 0 && len(files) > limit {
		files = files[:limit]
	}

	fmt.Printf("找到 %d 个文件\n", len(files))

	updated := 0
	for _, file := range files {
		fmt.Printf("处理: %s\n", file)

		// 读取文件内容
		content, err := os.ReadFile(file)
		if err != nil {
			fmt.Printf("  警告: 读取失败: %v\n", err)
			continue
		}

		// 提取正文（去掉 frontmatter）
		body := i.extractBody(string(content))

		// 调用 LLM 提取 tags
		extractResult, err := i.llmClient.ExtractTags(body)
		if err != nil {
			fmt.Printf("  警告: 提取 tags 失败: %v\n", err)
			continue
		}

		if dryRun {
			fmt.Printf("  将更新 tags: %v\n", extractResult.Tags)
		} else {
			// 更新文件 frontmatter
			if err := i.updateTagsInFile(file, string(content), extractResult.Tags); err != nil {
				fmt.Printf("  警告: 更新 tags 失败: %v\n", err)
				continue
			}
			fmt.Printf("  已更新 tags: %v\n", extractResult.Tags)
		}

		updated++
	}

	fmt.Printf("处理完成: %d/%d 文件\n", updated, len(files))
	return nil
}

// scanMarkdownFiles 扫描 markdown 文件
func (i *Intake) scanMarkdownFiles() ([]string, error) {
	var files []string

	// 扫描 FAQ、知识、文档目录
	dirs := []string{"FAQ", "知识", "文档"}
	for _, dir := range dirs {
		dirPath := filepath.Join(i.vaultPath, dir)
		if _, err := os.Stat(dirPath); os.IsNotExist(err) {
			continue
		}

		err := filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
			if err != nil {
				return err
			}
			if !info.IsDir() && strings.HasSuffix(path, ".md") {
				files = append(files, path)
			}
			return nil
		})
		if err != nil {
			return nil, err
		}
	}

	// 排序
	sort.Strings(files)
	return files, nil
}

// extractBody 提取正文（去掉 frontmatter）
func (i *Intake) extractBody(content string) string {
	// 查找 frontmatter 结束位置
	re := regexp.MustCompile(`(?s)^---\n.*?\n---\n`)
	loc := re.FindStringIndex(content)
	if loc != nil {
		return content[loc[1]:]
	}
	return content
}

// updateTagsInFile 更新文件中的 tags
func (i *Intake) updateTagsInFile(path, content string, tags []string) error {
	// 解析现有 frontmatter
	re := regexp.MustCompile(`(?s)^---\n(.*?)\n---`)
	matches := re.FindStringSubmatchIndex(content)
	if matches == nil {
		return fmt.Errorf("未找到 frontmatter")
	}

	frontmatter := content[matches[2]:matches[3]]

	// 替换 tags 行
	tagsRe := regexp.MustCompile(`(?m)^tags:.*$`)
	tagsLine := "tags: ["
	for i, tag := range tags {
		if i > 0 {
			tagsLine += ", "
		}
		tagsLine += fmt.Sprintf("%q", tag)
	}
	tagsLine += "]"

	newFrontmatter := tagsRe.ReplaceAllString(frontmatter, tagsLine)

	// 重建文件内容
	newContent := content[:matches[2]] + newFrontmatter + content[matches[3]:]

	return os.WriteFile(path, []byte(newContent), 0644)
}

// ListDrafts 列出所有活跃草稿
func (i *Intake) ListDrafts() ([]DraftInfo, error) {
	reviewBase := filepath.Join(i.vaultPath, "待审阅")

	if _, err := os.Stat(reviewBase); os.IsNotExist(err) {
		return []DraftInfo{}, nil
	}

	var drafts []DraftInfo

	err := filepath.Walk(reviewBase, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// 跳过 archive 目录
		if info.IsDir() && info.Name() == "archive" {
			return filepath.SkipDir
		}

		// 检查是否是目录结构（包含 draft.md）
		if !info.IsDir() && info.Name() == "draft.md" {
			draftDir := filepath.Dir(path)
			mergeFile := filepath.Join(draftDir, "merge.md")

			content, err := os.ReadFile(path)
			if err != nil {
				return nil
			}

			relPath, _ := filepath.Rel(i.vaultPath, path)
			hasMerge := fileExists(mergeFile)

			draft := DraftInfo{
				Filepath:     relPath,
				Filename:     filepath.Base(draftDir),
				HasMergeHint: hasMerge,
			}

			// 解析 frontmatter
			fm := parseFrontmatter(string(content))
			if title, ok := fm["title"]; ok {
				draft.Title = title
			}
			if status, ok := fm["status"]; ok {
				draft.Status = status
			}
			if draftType, ok := fm["type"]; ok {
				draft.Type = draftType
			}
			if created, ok := fm["created"]; ok {
				draft.Created = created
			}

			drafts = append(drafts, draft)
		}

		// 兼容旧结构（单文件 .md）
		if !info.IsDir() && filepath.Ext(info.Name()) == ".md" && info.Name() != "draft.md" && info.Name() != "merge.md" && info.Name() != "索引.json" {
			// 检查是否是数字开头
			name := info.Name()
			if len(name) >= 3 && isDigit(name[0]) && isDigit(name[1]) && isDigit(name[2]) {
				content, err := os.ReadFile(path)
				if err != nil {
					return nil
				}

				relPath, _ := filepath.Rel(i.vaultPath, path)

				draft := DraftInfo{
					Filepath:     relPath,
					Filename:     name,
					HasMergeHint: false,
				}

				// 解析 frontmatter
				fm := parseFrontmatter(string(content))
				if title, ok := fm["title"]; ok {
					draft.Title = title
				}
				if status, ok := fm["status"]; ok {
					draft.Status = status
				}
				if draftType, ok := fm["type"]; ok {
					draft.Type = draftType
				}
				if created, ok := fm["created"]; ok {
					draft.Created = created
				}

				drafts = append(drafts, draft)
			}
		}

		return nil
	})

	if err != nil {
		return nil, err
	}

	return drafts, nil
}

// ConvertOldDrafts 转换老格式草稿到新格式
func (i *Intake) ConvertOldDrafts(target string) (int, error) {
	reviewDir := filepath.Join(i.vaultPath, "待审阅")

	var dirs []string
	if target != "" {
		dirs = append(dirs, filepath.Join(reviewDir, target))
	} else {
		entries, err := os.ReadDir(reviewDir)
		if err != nil {
			return 0, err
		}

		for _, entry := range entries {
			if entry.IsDir() && entry.Name() != "archive" {
				dirs = append(dirs, filepath.Join(reviewDir, entry.Name()))
			}
		}
	}

	total := 0
	for _, dir := range dirs {
		if _, err := os.Stat(dir); os.IsNotExist(err) {
			continue
		}

		entries, err := os.ReadDir(dir)
		if err != nil {
			continue
		}

		var oldFiles []string
		for _, entry := range entries {
			if !entry.IsDir() && filepath.Ext(entry.Name()) == ".md" {
				// 检查是否是数字开头的单文件
				name := entry.Name()
				if len(name) >= 3 && isDigit(name[0]) && isDigit(name[1]) && isDigit(name[2]) {
					oldFiles = append(oldFiles, filepath.Join(dir, name))
				}
			}
		}

		if len(oldFiles) == 0 {
			continue
		}

		fmt.Printf("\n🔍 %s: 找到 %d 个老格式文件\n\n", filepath.Base(dir), len(oldFiles))

		for _, oldFile := range oldFiles {
			if convertOneDraft(oldFile) {
				total++
			}
		}
	}

	return total, nil
}

// convertOneDraft 转换单个老格式草稿
func convertOneDraft(oldFile string) bool {
	fmt.Printf("📄 转换: %s\n", filepath.Base(oldFile))

	content, err := os.ReadFile(oldFile)
	if err != nil {
		fmt.Printf("  ⚠️  读取失败: %v\n", err)
		return false
	}

	// 解析文件名
	name := filepath.Base(oldFile)
	ext := filepath.Ext(name)
	nameWithoutExt := strings.TrimSuffix(name, ext)

	// 提取编号、日期、标题
	parts := strings.SplitN(nameWithoutExt, "-", 3)
	if len(parts) < 3 {
		fmt.Printf("  ⚠️  文件名格式不匹配: %s\n", name)
		return false
	}

	num := parts[0]
	dateStr := parts[1]
	title := parts[2]

	// 创建新目录
	newDirName := fmt.Sprintf("%s-%s-%s", num, dateStr, title)
	newDir := filepath.Join(filepath.Dir(oldFile), newDirName)

	if err := os.MkdirAll(newDir, 0755); err != nil {
		fmt.Printf("  ⚠️  创建目录失败: %v\n", err)
		return false
	}

	// 解析 frontmatter
	fm := parseFrontmatter(string(content))

	// 构建标准化 frontmatter
	var sb strings.Builder
	sb.WriteString("---\n")
	if title, ok := fm["title"]; ok {
		sb.WriteString(fmt.Sprintf("title: %q\n", title))
	} else {
		sb.WriteString(fmt.Sprintf("title: %q\n", strings.ReplaceAll(title, "_", "/")))
	}
	sb.WriteString("status: \"draft\"\n")
	if draftType, ok := fm["type"]; ok {
		sb.WriteString(fmt.Sprintf("type: %q\n", draftType))
	} else {
		sb.WriteString("type: \"TAPD\"\n")
	}
	if source, ok := fm["source"]; ok {
		sb.WriteString(fmt.Sprintf("source: %q\n", source))
	} else {
		sb.WriteString(fmt.Sprintf("source: \"TAPD-%s\"\n", dateStr))
	}
	if tags, ok := fm["tags"]; ok {
		// 如果 tags 已经是数组格式，直接使用
		if strings.HasPrefix(tags, "[") {
			sb.WriteString(fmt.Sprintf("tags: %s\n", tags))
		} else {
			sb.WriteString(fmt.Sprintf("tags: [%s]\n", tags))
		}
	} else {
		sb.WriteString("tags: []\n")
	}
	if created, ok := fm["created"]; ok {
		sb.WriteString(fmt.Sprintf("created: %q\n", created))
	} else if created, ok := fm["date"]; ok {
		sb.WriteString(fmt.Sprintf("created: %q\n", created))
	} else {
		// 从日期字符串构造
		if len(dateStr) == 8 {
			created := fmt.Sprintf("%s-%s-%s", dateStr[:4], dateStr[4:6], dateStr[6:8])
			sb.WriteString(fmt.Sprintf("created: %q\n", created))
		}
	}
	sb.WriteString("---\n\n")

	// 提取正文（去掉原 frontmatter）
	body := extractBody(string(content))
	sb.WriteString(body)

	// 写入 draft.md
	draftFile := filepath.Join(newDir, "draft.md")
	if err := os.WriteFile(draftFile, []byte(sb.String()), 0644); err != nil {
		fmt.Printf("  ⚠️  写入 draft.md 失败: %v\n", err)
		return false
	}
	fmt.Printf("  ✅ 创建: draft.md\n")

	// 删除原文件
	if err := os.Remove(oldFile); err != nil {
		fmt.Printf("  ⚠️  删除原文件失败: %v\n", err)
	} else {
		fmt.Printf("  🗑️  删除: %s\n", name)
	}

	return true
}

// extractBody 提取正文（去掉 frontmatter）
func extractBody(content string) string {
	if !strings.HasPrefix(content, "---") {
		return content
	}

	endIdx := strings.Index(content[3:], "\n---")
	if endIdx == -1 {
		return content
	}

	return strings.TrimSpace(content[endIdx+7:])
}

// parseFrontmatter 解析 frontmatter
func parseFrontmatter(content string) map[string]string {
	result := make(map[string]string)

	if !strings.HasPrefix(content, "---") {
		return result
	}

	endIdx := strings.Index(content[3:], "\n---")
	if endIdx == -1 {
		return result
	}

	fmText := content[3 : endIdx+3]
	lines := strings.Split(fmText, "\n")

	for _, line := range lines {
		line = strings.TrimSpace(line)
		if line == "" || !strings.Contains(line, ":") {
			continue
		}

		parts := strings.SplitN(line, ":", 2)
		if len(parts) != 2 {
			continue
		}

		key := strings.TrimSpace(parts[0])
		value := strings.TrimSpace(parts[1])

		// 去除引号
		value = strings.Trim(value, "\"'")

		result[key] = value
	}

	return result
}

// isDigit 检查字符是否为数字
func isDigit(c byte) bool {
	return c >= '0' && c <= '9'
}

// fileExists 检查文件是否存在
func fileExists(path string) bool {
	_, err := os.Stat(path)
	return err == nil
}