#!/usr/bin/env python3

"""
Converts PDF text content (though not images containing text) to plain text, html, xml or "tags".
"""
import argparse
import logging
import sys
import pdfminer3.settings
pdfminer3.settings.STRICT = False
import pdfminer3.high_level
import pdfminer3.layout
from pdfminer3.image import ImageWriter


def extract_text(files=[], outfile='-',
            _py2_no_more_posargs=None,  # Bloody Python2 needs a shim
            no_laparams=False, all_texts=None, detect_vertical=None, # LAParams
            word_margin=None, char_margin=None, line_margin=None, boxes_flow=None, # LAParams
            output_type='text', codec='utf-8', strip_control=False,
            maxpages=0, page_numbers=None, password="", scale=1.0, rotation=0,
            layoutmode='normal', output_dir=None, debug=False,
            disable_caching=False, **other):
    if _py2_no_more_posargs is not None:
        raise ValueError("Too many positional arguments passed.")
    if not files:
        raise ValueError("Must provide files to work upon!")

    # If any LAParams group arguments were passed, create an LAParams object and
    # populate with given args. Otherwise, set it to None.
    if not no_laparams:
        laparams = pdfminer3.layout.LAParams()
        for param in ("all_texts", "detect_vertical", "word_margin", "char_margin", "line_margin", "boxes_flow"):
            paramv = locals().get(param, None)
            if paramv is not None:
                setattr(laparams, param, paramv)
    else:
        laparams = None

    imagewriter = None
    if output_dir:
        imagewriter = ImageWriter(output_dir)

    if output_type == "text" and outfile != "-":
        for override, alttype in (  (".htm", "html"),
                                    (".html", "html"),
                                    (".xml", "xml"),
                                    (".tag", "tag") ):
            if outfile.endswith(override):
                output_type = alttype

    if outfile == "-":
        outfp = sys.stdout
        if outfp.encoding is not None:
            codec = 'utf-8'
    else:
        outfp = open(outfile, "wb")


    for fname in files:
        with open(fname, "rb") as fp:
            pdfminer3.high_level.extract_text_to_fp(fp, **locals())
    return outfp


def maketheparser():
    parser = argparse.ArgumentParser(description=__doc__, add_help=True)
    parser.add_argument("files", type=str, default=None, nargs="+", help="File to process.")
    parser.add_argument("-d", "--debug", default=False, action="store_true", help="Debug output.")
    parser.add_argument("-p", "--pagenos", type=str, help="Comma-separated list of page numbers to parse. Included for legacy applications, use --page-numbers for more idiomatic argument entry.")
    parser.add_argument("--page-numbers", type=int, default=None, nargs="+", help="Alternative to --pagenos with space-separated numbers; supercedes --pagenos where it is used.")
    parser.add_argument("-m", "--maxpages", type=int, default=0, help="Maximum pages to parse")
    parser.add_argument("-P", "--password", type=str, default="", help="Decryption password for PDF")
    parser.add_argument("-o", "--outfile", type=str, default="-", help="Output file (default \"-\" is stdout)")
    parser.add_argument("-t", "--output_type", type=str, default="text", help="Output type: text|html|xml|tag (default is text)")
    parser.add_argument("-c", "--codec", type=str, default="utf-8", help="Text encoding")
    parser.add_argument("-s", "--scale", type=float, default=1.0, help="Scale")
    parser.add_argument("-A", "--all-texts", default=None, action="store_true", help="LAParams all texts")
    parser.add_argument("-V", "--detect-vertical", default=None, action="store_true", help="LAParams detect vertical")
    parser.add_argument("-W", "--word-margin", type=float, default=None, help="LAParams word margin")
    parser.add_argument("-M", "--char-margin", type=float, default=None, help="LAParams char margin")
    parser.add_argument("-L", "--line-margin", type=float, default=None, help="LAParams line margin")
    parser.add_argument("-F", "--boxes-flow", type=float, default=None, help="LAParams boxes flow")
    parser.add_argument("-Y", "--layoutmode", default="normal", type=str, help="HTML Layout Mode")
    parser.add_argument("-n", "--no-laparams", default=False, action="store_true", help="Pass None as LAParams")
    parser.add_argument("-R", "--rotation", default=0, type=int, help="Rotation")
    parser.add_argument("-O", "--output-dir", default=None, help="Output directory for images")
    parser.add_argument("-C", "--disable-caching", default=False, action="store_true", help="Disable caching")
    parser.add_argument("-S", "--strip-control", default=False, action="store_true", help="Strip control in XML mode")
    return parser


# main


def main(args=None):

    P = maketheparser()
    A = P.parse_args(args=args)

    if A.page_numbers:
        A.page_numbers = {x-1 for x in A.page_numbers}
    if A.pagenos:
        A.page_numbers = {int(x)-1 for x in A.pagenos.split(",")}

    imagewriter = None
    if A.output_dir:
        imagewriter = ImageWriter(A.output_dir)

    if A.output_type == "text" and A.outfile != "-":
        for override, alttype in (  (".htm",  "html"),
                                    (".html", "html"),
                                    (".xml",  "xml" ),
                                    (".tag",  "tag" ) ):
            if A.outfile.endswith(override):
                A.output_type = alttype

    if A.outfile == "-":
        outfp = sys.stdout
        if outfp.encoding is not None:
            # Why ignore outfp.encoding? :-/ stupid cathal?
            A.codec = 'utf-8'
    else:
        outfp = open(A.outfile, "wb")

    ## Test Code
    outfp = extract_text(**vars(A))
    outfp.close()
    return 0


if __name__ == '__main__': sys.exit(main())
