const { contextBridge, ipcRenderer } = require("electron")

window.stop()

function md_parse(selector) {
    var data = ""
    var readme_elements = document.querySelector(selector).children
    for (let i = 0; i < readme_elements.length; i++) {
        let element = readme_elements[i]

        let tag_name = element.tagName
        if (tag_name.startsWith("H") && tag_name.length === 2) {
            let header_lvl = tag_name[1]
            data += "\n" + "#".repeat(header_lvl) + " " + element.innerText
        } else if (tag_name === "P") {
            data += element.innerText
        } else if (tag_name === "UL") {
            let list_items = element.children
            for (let j = 0; j < list_items.length ; j++) {
                list_item = list_items[j]
                data += "\n* " + list_item.innerText.replaceAll("\n", "\n\t - ")
            }
        } else if (tag_name === "PRE") {
            data += "```\n" + element.innerText + "\n```\n"
        } else {
            data += "```\n" + element.innerText + "\n```\n"
        }
        data += "\n"
    }
    return data
}

function escape_gemtext(string) {
    return string.replaceAll(/\n\*/g, "\n *")
           .replaceAll(/\n>/g, "\n >")
           .replaceAll(/\n#/g, "\n #")
           .replaceAll(/^```/g, " ```")
           .replaceAll(/\n```/g, "\n ```")
}

function abs_href(href) {
    var current_site = window.location.protocol + "//" + window.location.hostname
    if (href.indexOf("http://") === 0 || href.indexOf("https://") === 0) {
        return "?" + href
    } else if (href.indexOf("gemini://") === 0) {
        return href
    } else if (href.startsWith("/")) {
        return "?" + current_site + href
    } else {
        return "?" + window.location.href + href
    }
}

function simple_convert() {
    var title = window.document.title
    var link_elements = document.getElementsByTagName("a")
    var pre_elements = document.getElementsByTagName("pre")
    var gemtext
    if (title) { title = "# " + title + "\n\n" }
    for (let link_element of link_elements) {
        let href = link_element.getAttribute("href")
        if (href === null) { continue }
        link_element.innerText = "\n=> " + abs_href(href) + " " + link_element.innerText + "\n"
    }
    gemtext = escape_gemtext(document.getRootNode().children[0].innerText)
    return title + gemtext
}

contextBridge.exposeInMainWorld(
  "electron",
  {
    send_gemtext: (gemtext) => {
        ipcRenderer.send("page-gemtext", gemtext)
    },
    request_sigil: (sigil_name) => {
        return ipcRenderer.invoke("request-sigil", sigil_name)
    },
    default_sigil: simple_convert,
    escape_gemtext: escape_gemtext,
    abs_href: abs_href,
    md_parse: md_parse,
  }
)