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import * as PJSON from "./pseudo_json.mjs"

import {transformTokens} from "./transform.mjs"

import markdown from "./markdown.mjs"

import * as fs from "fs"

import {dirname} from "path"

import {fileURLToPath} from "url"

import moldTemplate from "mold-template"

import {highlightCode, classHighlighter} from "@lezer/highlight"

import {Tree} from "@lezer/common"

import {html} from "@codemirror/lang-html"

import {javascript} from "@codemirror/lang-javascript"

import {css} from "@codemirror/lang-css"

import {StreamLanguage} from "@codemirror/language"

import {http} from "@codemirror/legacy-modes/mode/http"

const mold = new moldTemplate

let file, epub = false

for (let arg of process.argv.slice(2)) {

if (arg == "--epub") epub = true

else if (file) throw new Error("Multiple input files")

else file = arg == "-" ? "/dev/stdin" : arg

}

if (!file) throw new Error("No input file")

let chapter = /^\d{2}_([^\.]+)/.exec(file) || [null, "hints"]

let {tokens, metadata} = transformTokens(markdown.parse(fs.readFileSync(file, "utf8"), {}), {

defined: epub ? ["book", "html"] : ["interactive", "html"],

strip: epub ? "hints" : "",

takeTitle: true,

index: false

})

let close = epub ? "/" : ""

const dir = dirname(fileURLToPath(import.meta.url))

let chapters = fs.readdirSync(dir + "/..")

.filter(file => /^\d{2}_\w+\.md$/.test(file))

.sort()

.map(file => /^\d{2}_(\w+)\.md$/.exec(file)[1])

if (epub) chapters.push("hints")

function escapeChar(ch) {

return ch == "<" ? "&lt;" : ch == ">" ? "&gt;" : ch == "&" ? "&amp;" : "&quot;"

}

function escape(str) { return str.replace(/[<>&"]/g, escapeChar) }

// FIXME http highlighting

const parsers = {

css: css().language.parser,

html: html().language.parser,

javascript: javascript().language.parser,

json: javascript().language.parser.configure({top: "SingleExpression"}),

http: StreamLanguage.define(http).parser

}

const styled = "keyword atom number definition variableName2 typeName comment string string2 invalid meta"

.split(" ").map(n => "tok-" + n)

function highlight(lang, text) {

let result = "", parser = parsers[lang], tree = parser ? parser.parse(text) : Tree.empty

highlightCode(text, tree, classHighlighter, (code, cls) => {

let esc = escape(code)

cls = cls.replace(/([\w-]+)\s*/g, (m, style) => styled.includes(style) ? m : "")

result += cls ? `<span class="${cls}">${esc}</span>` : esc

}, () => result += "\n")

return result

}

function maybeSplitInlineCode(html) {

if (html.length <= 16) return html

return html.replace(/[.\/](?!\/)/g, `$&<wbr${close}>`)

}

const seenIDs = Object.create(null)

function anchor(token) {

let id = token.hashID

if (id in seenIDs) for (let i = 1;; i++) {

let ext = id + "_" + i

if (!(ext in seenIDs)) { id = ext; break }

}

seenIDs[id] = true

return `<a class="${id.charAt(0)}_ident" id="${id}" href="#${id}" tabindex="-1" role="presentation"></a>`

}

function attrs(token) {

return token.attrs ? token.attrs.map(([name, val]) => ` ${name}="${escape(String(val))}"`).join("") : ""

}

let linkedChapter = null

let renderer = {

fence(token) {

let config = /\S/.test(token.info) ? PJSON.parse(token.info) : {}

if (config.hidden) return "";

let lang = config.lang || "javascript", tab = lang == "html" || lang == "javascript" ? " tabindex=\"0\"" : ""

return `\n\n<pre${attrs(token)}${tab} class="snippet" data-language="${lang}" ${config.focus ? " data-focus=\"true\"" : ""}${config.sandbox ? ` data-sandbox="${config.sandbox}"` : ""}${config.meta ? ` data-meta="${config.meta}"` : ""}>${anchor(token)}${highlight(lang, token.content.trimRight())}</pre>`

},

hardbreak() { return `<br${close}>` },

softbreak() { return " " },

text(token) {

let {content} = token

if (linkedChapter != null) content = content.replace(/\?/g, linkedChapter)

return escape(content)

},

paragraph_open(token) { return `\n\n<p${attrs(token)}>${anchor(token)}` },

paragraph_close() { return "</p>" },

heading_open(token) { return `\n\n<${token.tag}${attrs(token)}>${anchor(token)}` },

heading_close(token) { return `</${token.tag}>` },

bullet_list_open(token) { return `\n\n<ul${attrs(token)}>` },

bullet_list_close() { return `</ul>` },

ordered_list_open(token) { return `\n\n<ol${attrs(token)}>` },

ordered_list_close() { return `\n\n</ol>` },

list_item_open() { return "\n\n<li>" },

list_item_close() { return "</li>" },

table_open() { return "\n\n<table>" },

table_close() { return "\n\n</table>" },

tbody_open() { return "" },

tbody_close() { return "" },

tr_open() { return "\n\n<tr>" },

tr_close() { return "\n\n</tr>" },

td_open() { return "<td>" },

td_close() { return "</td>" },

html_block(token) { return token.content },

code_inline(token) { return `<code>${maybeSplitInlineCode(escape(token.content))}</code>` },

strong_open() { return "<strong>" },

strong_close() { return "</strong>" },

em_open() { return "<em>" },

em_close() { return "</em>" },

sub_open() { return "<sub>" },

sub_close() { return "</sub>" },

sup_open() { return "<sup>" },

sup_close() { return "</sup>" },

link_open(token) {

let alt = token.attrGet("alt"), href= token.attrGet("href")

let maybeChapter = /^(\w+)(#.*)?$/.exec(href)

if (maybeChapter && chapters.includes(maybeChapter[1])) {

let number = ""

if (maybeChapter[1] != "hints") {

linkedChapter = chapters.indexOf(maybeChapter[1])

number = pad(linkedChapter) + "_"

}

href = number + maybeChapter[1] + (epub ? ".xhtml" : ".html") + (maybeChapter[2] || "")

}

return `<a href="${escape(href)}"${alt ? ` alt="${escape(alt)}"` : ""}>`

},

link_close() { linkedChapter = null; return "</a>" },

inline(token) { return renderArray(token.children) },

meta_figure(token) {

let {url, alt, chapter} = token.args[0]

let className = !chapter ? null : "chapter" + (chapter == "true" ? "" : " " + chapter)

return `<figure${attrs(token)}${className ? ` class="${className}"` : ""}><img src="${escape(url)}" alt="${escape(alt)}"${close}></figure>`

},

meta_quote_open() { return "\n\n<blockquote>" },

meta_quote_close(token) {

let {author, title} = token.args[0] || {}

return (author ? `\n\n<footer>${escape(author)}${title ? `, <cite>${escape(title)}</cite>` : ""}</footer>` : "") +

"\n\n</blockquote>"

},

meta_keyname_open() { return "<span class=\"keyname\">" },

meta_keyname_close() { return "</span>" },

meta_hint_open() { return "\n\n<details class=\"solution\"><summary>Display hints...</summary><div class=\"solution-text\">" },

meta_hint_close() { return "\n\n</div></details>" }

}

function renderArray(tokens) {

let result = ""

for (let i = 0; i < tokens.length; i++) {

let token = tokens[i], f = renderer[token.type]

if (!f) throw new Error("No render function for " + token.type)

result += f(token)

}

return result

}

function pad(n) {

return (n < 10 ? "0" : "") + n

}

metadata.content = renderArray(tokens)

let index

if (chapter && (index = chapters.indexOf(chapter[1])) > -1) {

metadata.page = {type: "chapter", number: index, load_files: metadata.load_files }

if (index > 0) metadata.prev_link = `${pad(index - 1)}_${chapters[index - 1]}`

if (index < chapters.length - 1) metadata.next_link = `${pad(index + 1)}_${chapters[index + 1]}`

} else {

metadata.page = {type: "hints"}

}

let template = mold.bake("chapter", fs.readFileSync(dir + `/${epub ? "epub_" : ""}chapter.html`, "utf8"))

console.log(template(metadata))