package main

import (
	pathpkg "path"
	"regexp"
	"strings"
	"time"
)

// Page represents a page.
type Page struct {
	Title   string    // The title of this page.
	Path    string    // The path to this page.
	Date    time.Time // The date of the page.
	Content string    // The content of this page.
}

// titleRe is a regexp to parse titles from Gemini files.
// It also matches the next line if it is empty.
var titleRE = regexp.MustCompile("^# ?([^#\r\n]+)\r?\n?\r?\n?")

// NewPage returns a new Page with the given path and content.
func NewPage(path string, content []byte) *Page {
	var page Page

	// Try to parse the date from the page filename
	const layout = "2006-01-02"
	base := pathpkg.Base(path)
	if len(base) >= len(layout) {
		dateStr := base[:len(layout)]
		if time, err := time.Parse(layout, dateStr); err == nil {
			page.Date = time
		}
		// Remove the date from the path
		base = base[len(layout):]
		if len(base) > 0 {
			// Remove a leading dash
			if base[0] == '-' {
				base = base[1:]
			}
			if len(base) > 0 {
				dir := pathpkg.Dir(path)
				if dir == "." {
					dir = ""
				}
				path = pathpkg.Join(dir, base)
			}
		}
	}

	// Try to parse the title from the contents
	if submatches := titleRE.FindSubmatch(content); submatches != nil {
		page.Title = string(submatches[1])
		// Remove the title from the contents
		content = content[len(submatches[0]):]
	}

	// Remove extension from path
	page.Path = "/" + strings.TrimSuffix(path, ".gmi")
	page.Content = string(content)
	return &page
}