// PDF From Scihub
// @author Polygon
// @link https://github.com/windingwind/zotero-actions-tags/discussions/124
//
// [Download PDF from Scihub]
// Name : Download PDF From Scihub
// Event : None
// Operation : Script
// Data : JS code below
// Shortcut: None
// Menu Label: Download PDF From Scihub


const ZoteroPane = require("ZoteroPane")
const Zotero = require("Zotero")
let DOI = ""
if (!item.isRegularItem()) {
    return "This type is not supported"
} else if ((DOI = item.getField("DOI")).length == 0) {
    return "No DOI does not support query"
}
// scihub start
let parser = new DOMParser()
let scihubUrl = "https://sci-hub.se"
let url = `${scihubUrl}/${DOI}`
let resp = await Zotero.HTTP.request("GET", url)
let htmlDoc = parser.parseFromString(resp.responseText, "text/html")
let pdfTag = htmlDoc.querySelector("#pdf")
if (pdfTag) {
    let pdfUrl = pdfTag.getAttribute("src")
    if (pdfUrl.startsWith("//")) {
        pdfUrl = "https:" + pdfUrl
    } else if (pdfUrl.startsWith("/")) {
        pdfUrl = scihubUrl + pdfUrl
    }
    let importOptions = {
        libraryID: item.libraryID,
        url: pdfUrl,
        parentItemID: item.id,
        title: "PDF_From_Scihub",
        fileBaseName: "Full_Text_by_Action",
        contentType: 'application/pdf',
        referrer: url,
    }
    // result is an attachment item
    let result = await Zotero.Attachments.importFromURL(importOptions)
    if (result.key) {
        return "SciHub Download Successful"
    }
}

// open-access start if pdf can not found in scihub
Zotero.launchURL(
    `https://www.open-access.xyz/?doi=${DOI}`
)
return "Querying..."