from __future__ import print_function

import os
import sys
from datetime import datetime

import portage
from portage.dbapi import porttree

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 'mirror://' in uri:
            uri = from_mirror(uri)

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

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

        ret[file].append(uri)

    return ret

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)
        if cpv:
            reload_gentoolkit()
            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
    urls = parse_src_uri(uris)

    versions = handlers.scan(pkg, urls, 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