import { PDFAcroField, PDFHexString, PDFName, PDFString, toHexString } from "pdf-lib";
import { loadPdfForm, savePdf } from "./saveLoadPdf.ts";
import { PDFDocument } from "pdf-lib";
import { call, callWithArgPrompt } from "./call.ts";

// const thing = PDFAcroField.prototype.getFullyQualifiedName;
// PDFAcroField.prototype.getFullyQualifiedName = function () {
//     const name = thing.call(this)
//     // if (name?.includes('langauge'))
//     console.log(name)
//     return name;
// }

// const thing = PDFHexString.prototype.copyBytesInto
// PDFHexString.prototype.copyBytesInto = function (buffer: Uint8Array, offset: number) {
//     console.log((this as any).value)

//     const result = thing.call(this, buffer, offset)
//     return result;
// }

async function renameFields(path: string, pattern: string | RegExp, change: string) {
    if (typeof pattern === 'string') pattern = new RegExp(pattern);
    const form = await loadPdfForm(path);
    const fields = form.getFields();
    let changesMade = false;
    for (const field of fields) {
        const name = field.getName();
        if (pattern.test(name)) {
            console.log(name + ' %cfound', "color: red");
            const segments = name.split('.')
            const matchingSegments = segments.filter(s => pattern.test(s));
            let cField: PDFAcroField | undefined = field.acroField;
            while (cField) {
                if (cField.getPartialName() && matchingSegments.includes(cField.getPartialName()!)) {
                    const mName = cField.getPartialName()?.replace(pattern, change)
                    if (mName) {
                        changesMade = true;
                        cField.dict.set(PDFName.of("T"), PDFString.of(mName))
                        // console.log(cField.getPartialName())
                    }
                }
                cField = cField.getParent();
                // console.log(cField?.getPartialName())
            }
            console.log(field.getName())
            // const newName = name.replace(pattern, change);
            // console.log("Change to: %c" + newName, "color: yellow");
            // if (confirm('Ok?')) {
            //     let parent = field.acroField.getParent();
            //     field.acroField.setPartialName(segments.pop())
            //     while (parent && segments.length) {
            //         console.log(parent.getPartialName())
            //         parent.setPartialName(segments.pop())
            //         parent = parent.getParent();
            //     }
            //     changesMade = true;
            //     console.log(field.getName())
            //     // dict.set(PDFName.of("T"), PDFHexString.fromText(newName))
            //     console.log("%cDone!", "color: lime")
            // }
            // break;
        }
    }
    if (changesMade) {
        savePdf(form.doc, path)
    }
}

if (import.meta.main) {
    // await call(renameFields)
    // while (!path || !path.endsWith('.pdf')) path = prompt("Please provide path to PDF:") || '';
    // while (!pattern) pattern = prompt("Please provide search string:") || '';
    // while (!change) change = prompt("Please provide requested change:") || '';
    await callWithArgPrompt(renameFields, [
        ["Please provide path to PDF:", (p) => !!p && p.endsWith('.pdf')],
        "Please provide search string:",
        "Please provide requested change:"
    ])
}