import JSZip from 'jszip'
import { splitByChapters } from './tiptap-to-html.js'
const EPUB_CSS = `
body{font-family:Georgia,"Times New Roman",serif;font-size:1em;line-height:1.8;max-width:34em;margin:0 auto;padding:1em 1.5em}
h1{font-size:1.5em;margin-top:2.5em;padding-bottom:0.3em;border-bottom:1px solid #ccc;page-break-before:always}
h1:first-of-type{page-break-before:avoid}
h2{font-size:1.2em;margin-top:1.5em}
h3{font-size:1.05em;font-style:italic}
p{margin:0.5em 0;text-indent:1.4em}
p:first-child,h1+p,h2+p,h3+p{text-indent:0}
blockquote{border-left:3px solid #aaa;padding-left:1em;margin:1em 0;font-style:italic;color:#444}
img{max-width:100%;display:block;margin:1em auto}
`
function xhtml(title, body) {
return `
${title}
${body}
`
}
export async function generateEpub(story) {
const zip = new JSZip()
const doc = typeof story.content === 'string' ? JSON.parse(story.content) : (story.content || {})
const title = story.title || 'Untitled'
const chapters = splitByChapters(doc, title)
const uid = `story-${story.id}`
zip.file('mimetype', 'application/epub+zip', { compression: 'STORE' })
zip.file('META-INF/container.xml', `
`)
zip.file('EPUB/styles.css', EPUB_CSS.trim())
const items = []
const itemrefs = []
const navEntries = []
chapters.forEach((ch, i) => {
const n = String(i + 1).padStart(3, '0')
const fname = `ch${n}.xhtml`
zip.file(`EPUB/${fname}`, xhtml(ch.title, ch.html))
items.push(`