import os
import sys
import subprocess
import shutil

from pdfminer.pdfparser import PDFParser
from pdfminer.pdfdocument import PDFDocument
from pdfminer.pdftypes import PDFObjRef, resolve1

from .utils import pdf_rect, ensure_dir, set_file_perms


def make_product_box(obj, pagenum, mediabox):
    rect = obj['Rect']

    if rect:
        name = obj['ProCatName'].decode() if 'ProCatName' in obj else ''
        material = obj['ProCatMaterialNumber'].decode() if 'ProCatMaterialNumber' in obj else ''
        color = obj['ProCatColor'].decode() if 'ProCatColor' in obj else ''
        gender = obj['ProCatGender'].decode() if 'ProCatGender' in obj else ''
        season = obj['ProCatSeason'].decode() if 'ProCatSeason' in obj else ''

        return { 'material': material,
                 'name': name,
                 'color': color,
                 'gender': gender,
                 'season': season,
                 'rect': pdf_rect(rect, mediabox[3]),
                 'page': pagenum }
    else:
        print('Annotation without rect:')
        print(dumper.dump(obj))
        return None


def make_scribble(obj, pagenum, mediabox, workdir):
    rect = obj['Rect'] # position on page

    # walk the object tree down to the image
    appearance = resolve1(obj['AP'])
    normal_appearance = appearance['N']
    if not normal_appearance or normal_appearance.objid <= 0:
        print('skipping scribble - no normal appearance')
        return

    normal_appearance = resolve1(normal_appearance)
    resources = resolve1(normal_appearance['Resources'])
    xobj = resolve1(resources['XObject'])
    im1 = resolve1(xobj['Im1']) # PDFStream of the image

    flter = im1['Filter']
    if flter.name == 'JPXDecode':
        path = export_jp2(im1, workdir, pagenum)
        return { 'page': pagenum,
                 'rect': pdf_rect(rect, mediabox[3]),
                 'objid': im1.objid,
                 'image': path }
    else:
        print('skipping non-jp2 image')
        return None


def export_jp2(obj, workdir, pagenum):
    oid = obj.objid
    ensure_dir(workdir)
    jp2_path = os.path.join(workdir, f"export-page{pagenum:03d}-obj{oid:05d}.jp2")
    png_path = os.path.join(workdir, f"export-page{pagenum:03d}-obj{oid:05d}.png")

    data = obj.get_rawdata()
    print('extracting jp2: {}'.format(jp2_path))
    with open(jp2_path, 'wb') as out:
        out.write(data)
        set_file_perms(jp2_path)

    result = subprocess.run(['opj_decompress', '-i', jp2_path, '-o', png_path], capture_output=True)
    if result.returncode != 0:
        print('ERROR converting {}:\n{}\n{}'.format(jp2_path, result.stdout.decode(), result.stderr.decode()))
    else:
        set_file_perms(png_path)

    return png_path


def parse_pdf(fname, workdir, debug=0):
    PDFDocument.debug = debug
    PDFParser.debug = debug

    fp = open(fname, 'rb')
    parser = PDFParser(fp)
    doc = PDFDocument(parser)

    prod_boxes = []
    scribbles = []

    page_dict = resolve1(doc.catalog['Pages'])
    pages = resolve1(page_dict['Kids'])
    pagenum = 0
    for page in pages:
        pagenum += 1
        page = resolve1(page)
        if not 'Annots' in page: continue

        mediabox = page['MediaBox']
        # if 'CropBox' in page:
        #     cropbox = page['CropBox']
        #     print('crop',cropbox)

        annots = page['Annots']
        if isinstance(annots, PDFObjRef):
            annots = resolve1(annots)

        for anno in annots:
            anno = resolve1(anno)
            if 'AAPL:AKExtras' in anno:
                scribbles.append(make_scribble(anno, pagenum, mediabox, workdir))
            elif 'ProCatName' in anno:
                prod_boxes.append(make_product_box(anno, pagenum, mediabox))
            else:
                print('ignoring other annotation')

    fp.close()

    return [list(filter(None, prod_boxes)), list(filter(None, scribbles))]