# -*- coding: utf-8 -*-

# Copyright 2014-2017 Mike Fährmann
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.

from __future__ import unicode_literals, print_function

__author__ = "Mike Fährmann"
__copyright__ = "Copyright 2014-2017 Mike Fährmann"
__license__ = "GPLv2"
__maintainer__ = "Mike Fährmann"
__email__ = "mike_faehrmann@web.de"

import sys

if sys.hexversion < 0x3030000:
    print("Python 3.3+ required", file=sys.stderr)
    sys.exit(1)

import logging
from . import version, config, option, extractor, job, exception

__version__ = version.__version__
log = logging.getLogger("gallery-dl")


def initialize_logging():
    # convert levelnames to lowercase
    for level in (10, 20, 30, 40, 50):
        name = logging.getLevelName(level)
        logging.addLevelName(level, name.lower())
    # setup basic logging to stderr
    formatter = logging.Formatter("[%(name)s][%(levelname)s] %(message)s")
    handler = logging.StreamHandler()
    handler.setFormatter(formatter)
    root = logging.getLogger()
    root.setLevel(logging.INFO)
    root.addHandler(handler)


def progress(urls, pformat):
    if pformat is True:
        pformat = "[{current}/{total}] {url}"
    pinfo = {"total": len(urls)}
    for pinfo["current"], pinfo["url"] in enumerate(urls, 1):
        print(pformat.format_map(pinfo), file=sys.stderr)
        yield pinfo["url"]


def sanatize_input(file):
    for line in file:
        line = line.strip()
        if line:
            yield line


def prepare_range(rangespec, target):
    if rangespec:
        range = util.optimize_range(util.parse_range(rangespec))
        if range:
            config.set(("_", target, "range"), range)
        else:
            log.warning("invalid/empty %s range", target)


def prepare_filter(filterexpr, target):
    if filterexpr:
        try:
            name = "<{} filter>".format(target)
            codeobj = compile(filterexpr, name, "eval")
            config.set(("_", target, "filter"), codeobj)
        except (SyntaxError, ValueError, TypeError) as exc:
            log.warning(exc)


def main():
    try:
        initialize_logging()
        parser = option.build_parser()
        args = parser.parse_args()
        logging.getLogger().setLevel(args.loglevel)

        # configuration
        if args.load_config:
            config.load()
        if args.cfgfiles:
            config.load(*args.cfgfiles, strict=True)
        if args.yamlfiles:
            config.load(*args.yamlfiles, format="yaml", strict=True)
        for key, value in args.options:
            config.set(key, value)
        config.set(("_",), {})

        # logging
        if args.loglevel >= logging.ERROR:
            config.set(("output", "mode"), "null")
        elif args.loglevel <= logging.DEBUG:
            import platform
            log.debug("Version %s", __version__)
            log.debug("Python %s - %s",
                      platform.python_version(), platform.platform())

        if args.list_modules:
            for module_name in extractor.modules:
                print(module_name)
        elif args.list_extractors:
            for extr in extractor.extractors():
                if not extr.__doc__:
                    continue
                print(extr.__name__)
                print(extr.__doc__)
                print("Category:", extr.category,
                      "- Subcategory:", extr.subcategory)
                if hasattr(extr, "test") and extr.test:
                    print("Example :", extr.test[0][0])
                print()
        else:
            if not args.urls and not args.inputfile:
                parser.error(
                    "The following arguments are required: URL\n"
                    "Use 'gallery-dl --help' to get a list of all options.")

            if args.list_urls:
                jobtype = job.UrlJob
                jobtype.maxdepth = args.list_urls
            elif args.list_keywords:
                jobtype = job.KeywordJob
            elif args.list_data:
                jobtype = job.DataJob
            else:
                jobtype = job.DownloadJob

            urls = args.urls
            if args.inputfile:
                try:
                    if args.inputfile == "-":
                        file = sys.stdin
                    else:
                        file = open(args.inputfile)
                    urls += sanatize_input(file)
                except OSError as exc:
                    log.warning("input-file: %s", exc)

            if args.unsupportedfile:
                try:
                    job.Job.ufile = open(args.unsupportedfile, "w")
                except OSError as exc:
                    log.warning("unsupported-URL file: %s", exc)

            prepare_range(args.image_range, "image")
            prepare_range(args.chapter_range, "chapter")
            prepare_filter(args.image_filter, "image")
            # prepare_filter(args.chapter_filter, "chapter")

            pformat = config.get(("output", "progress"), True)
            if pformat and len(urls) > 1 and args.loglevel < logging.ERROR:
                urls = progress(urls, pformat)

            for url in urls:
                try:
                    log.debug("Starting %s for '%s'", jobtype.__name__, url)
                    jobtype(url).run()
                except exception.NoExtractorError:
                    log.error("No suitable extractor found for '%s'", url)

    except KeyboardInterrupt:
        print("\nKeyboardInterrupt", file=sys.stderr)
    except BrokenPipeError:
        pass
    except IOError as exc:
        import errno
        if exc.errno != errno.EPIPE:
            raise