# Ultroid - UserBot
# Copyright (C) 2021 TeamUltroid
#
# This file is a part of < https://github.com/TeamUltroid/Ultroid/ >
# PLease read the GNU Affero General Public License in
# <https://www.github.com/TeamUltroid/Ultroid/blob/main/LICENSE/>.
"""
✘ Commands Available -

• `{i}pdf <page num> <reply to pdf file>`
    Extract nd Send page as a Image.(note-: For Extraction all pages just use .pdf)
    You Can use multi pages too like `{i}pdf 1-7`

• `{i}pdtext <page num> <reply to pdf file>`
    Extract Text From the Pdf.(note-: For Extraction all text just use .pdtext)
    You Can use multi pages too like `{i}pdf 1-7`

• `{i}pdscan <reply to image>`
    It scan, crop nd send img as pdf.

• `{i}pdsave <reply to image/pdf>`
    It scan, crop nd save file to merge u can merge many pages as a single pdf.

• `{i}pdsend `
    Merge nd send the Pdf to collected from .pdsave.
"""
import glob
import os
import shutil
import time

import cv2
import imutils
import numpy as np
import PIL
from imutils.perspective import four_point_transform
from PyPDF2 import PdfFileMerger, PdfFileReader, PdfFileWriter
from skimage.filters import threshold_local
from telethon.errors.rpcerrorlist import PhotoSaveFileInvalidError

from . import *

if not os.path.isdir("pdf"):
    os.mkdir("pdf")


@ultroid_cmd(
    pattern="pdf ?(.*)",
)
async def pdfseimg(event):
    ok = await event.get_reply_message()
    msg = event.pattern_match.group(1)
    if not (ok and (ok.document and (ok.document.mime_type == "application/pdf"))):
        await eor(event, "`Reply The pdf u Want to Download..`")
        return
    xx = await eor(event, "Processing...")
    file = ok.media.document
    k = time.time()
    filename = "hehe.pdf"
    result = await downloader(
        "pdf/" + filename,
        file,
        xx,
        k,
        "Downloading " + filename + "...",
    )
    await xx.delete()
    pdfp = "pdf/hehe.pdf"
    pdfp.replace(".pdf", "")
    pdf = PdfFileReader(pdfp)
    if not msg:
        ok = []
        for num in range(pdf.numPages):
            pw = PdfFileWriter()
            pw.addPage(pdf.getPage(num))
            fil = os.path.join("pdf/ult{}.png".format(num + 1))
            ok.append(fil)
            with open(fil, "wb") as f:
                pw.write(f)
        os.remove(pdfp)
        for z in ok:
            await event.client.send_file(event.chat_id, z)
        shutil.rmtree("pdf")
        os.mkdir("pdf")
        await xx.delete()
    elif "-" in msg:
        ok = int(msg.split("-")[-1]) - 1
        for o in range(ok):
            pw = PdfFileWriter()
            pw.addPage(pdf.getPage(o))
            with open(os.path.join("ult.png"), "wb") as f:
                pw.write(f)
            await event.reply(
                file="ult.png",
            )
            os.remove("ult.png")
        os.remove(pdfp)
    else:
        o = int(msg) - 1
        pw = PdfFileWriter()
        pw.addPage(pdf.getPage(o))
        with open(os.path.join("ult.png"), "wb") as f:
            pw.write(f)
        os.remove(pdfp)
        try:
            await event.reply(file="ult.png")
        except PhotoSaveFileInvalidError:
            await event.reply(file="ult.png", force_document=True)
        os.remove("ult.png")


@ultroid_cmd(
    pattern="pdtext ?(.*)",
)
async def pdfsetxt(event):
    ok = await event.get_reply_message()
    msg = event.pattern_match.group(1)
    if not ok and ok.document and ok.document.mime_type == "application/pdf":
        await eor(event, "`Reply The pdf u Want to Download..`")
        return
    xx = await eor(event, "`Processing...`")
    file = ok.media.document
    k = time.time()
    filename = ok.file.name
    result = await downloader(
        filename,
        file,
        xx,
        k,
        "Downloading " + filename + "...",
    )
    await xx.delete()
    dl = result.name
    if not msg:
        pdf = PdfFileReader(dl)
        text = f"{dl.split('.')[0]}.txt"
        with open(text, "w") as f:
            for page_num in range(pdf.numPages):
                pageObj = pdf.getPage(page_num)
                txt = pageObj.extractText()
                f.write("Page {}\n".format(page_num + 1))
                f.write("".center(100, "-"))
                f.write(txt)
        await event.client.send_file(
            event.chat_id,
            text,
            reply_to=event.reply_to_msg_id,
        )
        os.remove(text)
        os.remove(dl)
        return
    if "-" in msg:
        u, d = msg.split("-")
        a = PdfFileReader(dl)
        str = "".join(a.getPage(i).extractText() for i in range(int(u) - 1, int(d)))
        text = f"{dl.split('.')[0]} {msg}.txt"
    else:
        u = int(msg) - 1
        a = PdfFileReader(dl)
        str = a.getPage(u).extractText()
        text = f"{dl.split('.')[0]} Pg-{msg}.txt"

    with open(text, "w") as f:
        f.write(str)
    await event.client.send_file(
        event.chat_id,
        text,
        reply_to=event.reply_to_msg_id,
    )
    os.remove(text)
    os.remove(dl)


@ultroid_cmd(
    pattern="pdscan ?(.*)",
)
async def imgscan(event):
    ok = await event.get_reply_message()
    if not (ok and (ok.media)):
        await eor(event, "`Reply The pdf u Want to Download..`")
        return
    ultt = await ok.download_media()
    if not ultt.endswith(("png", "jpg", "jpeg", "webp")):
        await eor(event, "`Reply to a Image only...`")
        os.remove(ultt)
        return
    xx = await eor(event, "`Processing...`")
    image = cv2.imread(ultt)
    original_image = image.copy()
    ratio = image.shape[0] / 500.0
    image = imutils.resize(image, height=500)
    image_yuv = cv2.cvtColor(image, cv2.COLOR_BGR2YUV)
    image_y = np.zeros(image_yuv.shape[0:2], np.uint8)
    image_y[:, :] = image_yuv[:, :, 0]
    image_blurred = cv2.GaussianBlur(image_y, (3, 3), 0)
    edges = cv2.Canny(image_blurred, 50, 200, apertureSize=3)
    contours, hierarchy = cv2.findContours(
        edges,
        cv2.RETR_EXTERNAL,
        cv2.CHAIN_APPROX_SIMPLE,
    )
    polygons = []
    for cnt in contours:
        hull = cv2.convexHull(cnt)
        polygons.append(cv2.approxPolyDP(hull, 0.01 * cv2.arcLength(hull, True), False))
        sortedPoly = sorted(polygons, key=cv2.contourArea, reverse=True)
        cv2.drawContours(image, sortedPoly[0], -1, (0, 0, 255), 5)
        simplified_cnt = sortedPoly[0]
    if len(simplified_cnt) == 4:
        cropped_image = four_point_transform(
            original_image,
            simplified_cnt.reshape(4, 2) * ratio,
        )
        gray_image = cv2.cvtColor(cropped_image, cv2.COLOR_BGR2GRAY)
        T = threshold_local(gray_image, 11, offset=10, method="gaussian")
        ok = (gray_image > T).astype("uint8") * 255
    if len(simplified_cnt) != 4:
        ok = cv2.detailEnhance(original_image, sigma_s=10, sigma_r=0.15)
    cv2.imwrite("o.png", ok)
    image1 = PIL.Image.open("o.png")
    im1 = image1.convert("RGB")
    scann = f"Scanned {ultt.split('.')[0]}.pdf"
    im1.save(scann)
    await event.client.send_file(event.chat_id, scann, reply_to=event.reply_to_msg_id)
    await xx.delete()
    os.remove(ultt)
    os.remove("o.png")
    os.remove(scann)


@ultroid_cmd(
    pattern="pdsave ?(.*)",
)
async def savepdf(event):
    ok = await event.get_reply_message()
    if not (ok and (ok.media)):
        await eor(
            event,
            "`Reply to Images/pdf which u want to merge as a single pdf..`",
        )
        return
    ultt = await ok.download_media()
    if ultt.endswith(("png", "jpg", "jpeg", "webp")):
        xx = await eor(event, "`Processing...`")
        image = cv2.imread(ultt)
        original_image = image.copy()
        ratio = image.shape[0] / 500.0
        image = imutils.resize(image, height=500)
        image_yuv = cv2.cvtColor(image, cv2.COLOR_BGR2YUV)
        image_y = np.zeros(image_yuv.shape[0:2], np.uint8)
        image_y[:, :] = image_yuv[:, :, 0]
        image_blurred = cv2.GaussianBlur(image_y, (3, 3), 0)
        edges = cv2.Canny(image_blurred, 50, 200, apertureSize=3)
        contours, hierarchy = cv2.findContours(
            edges,
            cv2.RETR_EXTERNAL,
            cv2.CHAIN_APPROX_SIMPLE,
        )
        polygons = []
        for cnt in contours:
            hull = cv2.convexHull(cnt)
            polygons.append(
                cv2.approxPolyDP(hull, 0.01 * cv2.arcLength(hull, True), False),
            )
            sortedPoly = sorted(polygons, key=cv2.contourArea, reverse=True)
            cv2.drawContours(image, sortedPoly[0], -1, (0, 0, 255), 5)
            simplified_cnt = sortedPoly[0]
        if len(simplified_cnt) == 4:
            cropped_image = four_point_transform(
                original_image,
                simplified_cnt.reshape(4, 2) * ratio,
            )
            gray_image = cv2.cvtColor(cropped_image, cv2.COLOR_BGR2GRAY)
            T = threshold_local(gray_image, 11, offset=10, method="gaussian")
            ok = (gray_image > T).astype("uint8") * 255
        if len(simplified_cnt) != 4:
            ok = cv2.detailEnhance(original_image, sigma_s=10, sigma_r=0.15)
        cv2.imwrite("o.png", ok)
        image1 = PIL.Image.open("o.png")
        im1 = image1.convert("RGB")
        a = dani_ck("pdf/scan.pdf")
        im1.save(a)
        await xx.edit(
            f"Done, Now Reply Another Image/pdf if completed then use {hndlr}pdsend to merge nd send all as pdf",
        )
        os.remove("o.png")
    elif ultt.endswith(".pdf"):
        a = dani_ck("pdf/scan.pdf")
        await event.client.download_media(ok, a)
        await eor(
            event,
            f"Done, Now Reply Another Image/pdf if completed then use {hndlr}pdsend to merge nd send all as pdf",
        )
    else:
        await eor(event, "`Reply to a Image/pdf only...`")
    os.remove(ultt)


@ultroid_cmd(
    pattern="pdsend ?(.*)",
)
async def sendpdf(event):
    if not os.path.exists("pdf/scan.pdf"):
        await eor(
            event,
            "first select pages by replying .pdsave of which u want to make multi page pdf file",
        )
        return
    msg = event.pattern_match.group(1)
    ok = f"{msg}.pdf" if msg else "My PDF File.pdf"
    merger = PdfFileMerger()
    afl = glob.glob("pdf/*")
    ok = [*sorted(afl)]
    for item in ok:
        if item.endswith("pdf"):
            merger.append(item)
    merger.write(ok)
    await event.client.send_file(event.chat_id, ok, reply_to=event.reply_to_msg_id)
    os.remove(ok)
    shutil.rmtree("pdf/")
    os.makedirs("pdf/")