package note

import (
	"crypto/sha256"
	"fmt"
	"strings"
	"time"
)

type Note struct {
	ID      string
	Path    string
	Title   string
	Content string
	Size    int64
	// HTMLContent string
	// Directly in Note
	Tags      []string
	UpdatedAt time.Time
	Published bool
}

func NewNote() *Note {
	return &Note{}
}

func formatDateRep(date time.Time) string {
	return date.Format("2006-01-02 15:04:05")
}

func (n *Note) GetUpdateDateRep() string {
	return formatDateRep(n.UpdatedAt)
}

func (n *Note) GetSizeKB() string {
	if n.Size <= 0 {
		return "0 KB"
	}
	kb := float64(n.Size) / 1024.0
	return fmt.Sprintf("%.1f KB", kb)
}

// ExtractTitle return the first level heading content ('# title')
func ExtractTitle(mkd string) string {
	if mkd == "" {
		return ""
	}

	lines := strings.Split(mkd, "\n")
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if strings.HasPrefix(line, "# ") {
			// Extract title from # heading
			title := strings.TrimPrefix(line, "# ")
			title = strings.TrimSpace(title)
			// Remove common markdown formatting
			title = removeMarkdownFormatting(title)
			return title
		}
	}
	return ""
}

// removeMarkdownFormatting removes common markdown formatting from text
func removeMarkdownFormatting(text string) string {
	// Remove **bold** and *italic* formatting
	result := text
	result = strings.ReplaceAll(result, "**", "")
	result = strings.ReplaceAll(result, "*", "")
	result = strings.ReplaceAll(result, "_", "")
	result = strings.ReplaceAll(result, "`", "")
	result = strings.ReplaceAll(result, "~~", "")

	// Clean up multiple spaces
	result = strings.Join(strings.Fields(result), " ")

	return result
}

func GenerateNoteID(path string) string {
	return fmt.Sprintf("%x", sha256.Sum256([]byte(path)))[:10]
}