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# Copyright (c) 2018 crocoite contributors
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

"""
Misc tools
"""

import shutil, sys, os, logging, argparse, json
from io import BytesIO
from warcio.archiveiterator import ArchiveIterator
from warcio.warcwriter import WARCWriter
from pkg_resources import parse_version, parse_requirements
from .util import packageUrl, getSoftwareInfo

def mergeWarc (files, output):
    unique = 0
    revisit = 0
    payloadMap = {}
    writer = WARCWriter (output, gzip=True)

    # Add an additional warcinfo record, describing the transformations. This
    # is not ideal, since
    #   “A ‘warcinfo’ record describes the records that
    #   follow it […] until next ‘warcinfo’”
    #   -- https://iipc.github.io/warc-specifications/specifications/warc-format/warc-1.1/#warcinfo
    # A warcinfo record is expected at the beginning of every file. But it
    # might have written by a different software, so we don’t want to
    # strip/replace that information, but supplement it.
    warcinfo = {
            'software': getSoftwareInfo (),
            'tool': 'crocoite-merge', # not the name of the cli tool
            'parameters': {'inputs': files},
            }
    payload = BytesIO (json.dumps (warcinfo, indent=2).encode ('utf-8'))
    record = writer.create_warc_record (packageUrl ('warcinfo'), 'warcinfo',
            payload=payload,
            warc_headers_dict={'Content-Type': 'text/plain; encoding=utf-8'})
    writer.write_record (record)

    for l in files:
        with open (l, 'rb') as fd:
            for record in ArchiveIterator (fd):
                if record.rec_type in {'resource', 'response'}:
                    headers = record.rec_headers
                    rid = headers.get_header('WARC-Record-ID')
                    csum = headers.get_header('WARC-Payload-Digest')
                    dup = payloadMap.get (csum, None)
                    if dup is None:
                        payloadMap[csum] = {'uri': headers.get_header('WARC-Target-URI'),
                                'id': rid, 'date': headers.get_header('WARC-Date')}
                        unique += 1
                    else:
                        logging.debug ('Record {} is duplicate of {}'.format (rid, dup['id']))
                        # Payload may be identical, but HTTP headers are
                        # (probably) not. Include them.
                        record = writer.create_revisit_record (
                                headers.get_header('WARC-Target-URI'), digest=csum,
                                refers_to_uri=dup['uri'], refers_to_date=dup['date'],
                                http_headers=record.http_headers)
                        record.rec_headers.add_header ('WARC-Truncated', 'length')
                        record.rec_headers.add_header ('WARC-Refers-To', dup['id'])
                        revisit += 1
                else:
                    unique += 1
                writer.write_record (record)
    logging.info ('Wrote {} unique records, {} revisits'.format (unique, revisit))

def mergeWarcCli():
    parser = argparse.ArgumentParser(description='Merge WARCs, reads filenames from stdin.')
    parser.add_argument('--verbose', '-v', action='store_true')
    parser.add_argument('output', type=argparse.FileType ('wb'), help='Output WARC')

    args = parser.parse_args()
    loglevel = logging.DEBUG if args.verbose else logging.INFO
    logging.basicConfig (level=loglevel)

    mergeWarc([l.strip() for l in sys.stdin], args.output)

def extractScreenshot ():
    """
    Extract page screenshots from a WARC generated by crocoite into files
    """

    parser = argparse.ArgumentParser(description='Extract screenshots.')
    parser.add_argument('-f', '--force', action='store_true', help='Overwrite existing files')
    parser.add_argument('input', type=argparse.FileType ('rb'), help='Input WARC')
    parser.add_argument('prefix', help='Output file prefix')

    args = parser.parse_args()

    with args.input:
        for record in ArchiveIterator (args.input):
            headers = record.rec_headers
            if record.rec_type != 'conversion' or \
                    headers['Content-Type'] != 'image/png' or \
                    'X-Crocoite-Screenshot-Y-Offset' not in headers:
                continue

            urlSanitized = headers.get_header('WARC-Target-URI').replace ('/', '_')
            xoff = 0
            yoff = int (headers.get_header ('X-Crocoite-Screenshot-Y-Offset'))
            outpath = '{}-{}-{}-{}.png'.format (args.prefix, urlSanitized, xoff, yoff)
            if args.force or not os.path.exists (outpath):
                with open (outpath, 'wb') as out:
                    shutil.copyfileobj (record.raw_stream, out)
            else:
                print ('not overwriting {}'.format (outpath))

class Errata:
    __slots__ = ('uuid', 'description', 'affects')

    def __init__ (self, uuid, description, affects):
        self.uuid = uuid
        self.description = description
        # slightly abusing setuptool’s version parsing/matching here
        self.affects = list (parse_requirements(affects))

    def __contains__ (self, pkg):
        """
        Return True if the versions in pkg are affected by this errata

        pkg must be a mapping from project_name to version
        """
        matchedAll = []
        for a in self.affects:
            haveVersion = pkg.get (a.project_name, None)
            matchedAll.append (haveVersion is not None and haveVersion in a)
        return all (matchedAll)

    def __repr__ (self):
        return '{}({!r}, {!r}, {!r})'.format (self.__class__.__name__,
                self.uuid, self.description, self.affects)

    @property
    def fixable (self):
        return getattr (self, 'applyFix', None) is not None

    def toDict (self):
        return {'uuid': self.uuid,
                'description': self.description,
                'affects': list (map (str, self.affects)),
                'fixable': self.fixable}

class FixableErrata(Errata):
    def applyFix (self, records):
        raise NotImplementedError () # pragma: no cover

bugs = [
    Errata (uuid='34a176b3-ad3d-430f-a082-68087f304572',
            description='Generated by version < 1.0. No erratas are supported for this version.',
            affects=['crocoite<1.0'],
            ),
    ]

def makeReport (fd):
    for record in ArchiveIterator (fd):
        if record.rec_type == 'warcinfo':
            try:
                data = json.load (record.raw_stream)
                haveVersions = dict ([(pkg['projectName'], parse_version(pkg['version'])) for pkg in data['software']['self']])
                yield from filter (lambda b: haveVersions in b, bugs)
            except json.decoder.JSONDecodeError:
                pass

def errata ():
    parser = argparse.ArgumentParser(description='Show/fix erratas for WARCs generated by {}.'.format (__package__))
    parser.add_argument('input', type=argparse.FileType ('rb'), help='Input WARC')

    args = parser.parse_args()

    hasErrata = False
    for item in makeReport (args.input):
        json.dump (item.toDict (), sys.stdout)
        sys.stdout.write ('\n')
        sys.stdout.flush ()
        hasErrata = True
    return int (hasErrata)