import os
import sys
from datetime import datetime

import portage

import gentoolkit.pprinter as pp
from gentoolkit.query import Query
from gentoolkit.package import Package

from euscan import CONFIG, BLACKLIST_PACKAGES
from euscan import handlers, output
from euscan.out import from_mirror
from euscan.helpers import version_blacklisted
from euscan.version import is_version_stable
from euscan.ebuild import package_from_ebuild


def filter_versions(cp, versions):
    filtered = {}

    for url, version, handler, confidence in versions:

        # Try to keep the most specific urls (determinted by the length)
        if version in filtered and len(url) < len(filtered[version]):
            continue

        # Remove blacklisted versions
        if version_blacklisted(cp, version):
            continue

        filtered[version] = {
            "url": url,
            "handler": handler,
            "confidence": confidence
        }

    return [
        (cp, filtered[version]["url"], version, filtered[version]["handler"],
         filtered[version]["confidence"])
        for version in filtered
    ]


def parse_src_uri(uris):
    ret = {}

    uris = uris.split()
    uris.reverse()
    while uris:
        uri = uris.pop()

        if '://' not in uri:
            continue

        if uris and uris[-1] == "->":
            uris.pop()  # operator
            file_ = uris.pop()
        else:
            file_ = os.path.basename(uri)

        if file_ not in ret:
            ret[file_] = []

        ret[file_].append(uri)

    return ret


def reload_gentoolkit():
    import gentoolkit

    # Not used in recent versions
    if not hasattr(gentoolkit.package, 'PORTDB'):
        return

    PORTDB = portage.db[portage.root]["porttree"].dbapi

    if hasattr(gentoolkit.dbapi, 'PORTDB'):
        gentoolkit.dbapi.PORTDB = PORTDB
    if hasattr(gentoolkit.package, 'PORTDB'):
        gentoolkit.package.PORTDB = PORTDB
    if hasattr(gentoolkit.query, 'PORTDB'):
        gentoolkit.query.PORTDB = PORTDB


def scan_upstream(query, on_progress=None):
    """
    Scans the upstream searching new versions for the given query
    """
    matches = []

    if query.endswith(".ebuild"):
        cpv = package_from_ebuild(query)
        reload_gentoolkit()
        if cpv:
            matches = [Package(cpv)]
    else:
        matches = Query(query).find(
            include_masked=True,
            in_installed=False,
        )

    if not matches:
        output.ewarn(
            pp.warn("No package matching '%s'" % pp.pkgquery(query))
        )
        return None

    matches = sorted(matches)
    pkg = matches.pop()

    while '9999' in pkg.version and len(matches):
        pkg = matches.pop()

    if not pkg:
        output.ewarn(
            pp.warn("Package '%s' only have a dev version (9999)"
                    % pp.pkgquery(pkg.cp))
        )
        return None

    # useful data only for formatted output
    start_time = datetime.now()
    output.metadata("datetime", start_time.isoformat(), show=False)
    output.metadata("cp", pkg.cp, show=False)
    output.metadata("cpv", pkg.cpv, show=False)

    if on_progress:
        on_progress(increment=10)

    if pkg.cp in BLACKLIST_PACKAGES:
        output.ewarn(
            pp.warn("Package '%s' is blacklisted" % pp.pkgquery(pkg.cp))
        )
        return None

    if not CONFIG['quiet']:
        if not CONFIG['format']:
            pp.uprint(
                " * %s [%s]" % (pp.cpv(pkg.cpv), pp.section(pkg.repo_name()))
            )
            pp.uprint()
        else:
            output.metadata("overlay", pp.section(pkg.repo_name()))

        ebuild_path = pkg.ebuild_path()
        if ebuild_path:
            output.metadata(
                "ebuild", pp.path(os.path.normpath(ebuild_path))
            )

        uris, homepage, description = pkg.environment(
            ('SRC_URI', 'HOMEPAGE', 'DESCRIPTION')
        )

        output.metadata("repository", pkg.repo_name())
        output.metadata("homepage", homepage)
        output.metadata("description", description)
    else:
        uris = pkg.environment('SRC_URI')

    cpv = pkg.cpv

    uris = parse_src_uri(uris)
    uris_expanded = [
        from_mirror(uri) if 'mirror://' in uri else uri for uri in uris
    ]

    pkg._uris = uris
    pkg._uris_expanded = uris_expanded

    versions = handlers.scan(pkg, uris, on_progress)

    cp, ver, rev = portage.pkgsplit(pkg.cpv)

    result = filter_versions(cp, versions)

    if on_progress:
        on_progress(increment=10)

    # output scan time for formatted output
    scan_time = (datetime.now() - start_time).total_seconds()
    output.metadata("scan_time", scan_time, show=False)

    is_current_version_stable = is_version_stable(ver)
    if len(result) > 0:
        if not (CONFIG['format'] or CONFIG['quiet']):
            print("")
        for cp, url, version, handler, confidence in result:
            if CONFIG["ignore-pre-release"]:
                if not is_version_stable(version):
                    continue
            if CONFIG["ignore-pre-release-if-stable"]:
                if is_current_version_stable and \
                   not is_version_stable(version):
                    continue
            if CONFIG['progress']:
                print("", file=sys.stderr)
            output.result(cp, version, url, handler, confidence)

    return result