# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.

import asyncio
import functools
from jinja2 import Environment, FileSystemLoader
import libmozdata.config
from libmozdata.hgmozilla import Mercurial
import requests
from urllib.parse import parse_qs, urlencode, urlparse
from . import buginfo, models, utils


def findall(p, s):
    """Yields all the positions of
    the pattern p in the string s."""
    i = s.find(p)
    while i != -1:
        yield i
        i = s.find(p, i + 1)


def get_bz_query(data):
    """Get the Bugzilla query inside the Socorro web page"""
    needle = 'href="https://bugzilla.mozilla.org/enter_bug.cgi?'
    for i in findall(needle, data):
        j = data.index('"', i + len(needle))
        if j != -1:
            bz_url = data[i + len('href="'):j]
            bz_url = bz_url.replace("&", "&")
            bz_url = bz_url.replace("&lt;", "<")
            bz_url = bz_url.replace("&gt;", ">")
            bz_url = bz_url.replace("&quot;", '"')
            bz_url = bz_url.replace("&apos;", "'")
            if "keywords=crash" in bz_url:
                query = parse_qs(urlparse(bz_url).query)
                return query
    return {}


def improve(query, bzdata, bugid):
    """Improve the Bugzilla query we found with other useful info"""
    if "bugs" in bzdata and len(bzdata["bugs"]) == 1:
        bzdata = bzdata["bugs"][0]
        query["product"] = bzdata["product"]
        query["component"] = bzdata["component"]
        query["keywords"] = "{},regression".format(query["keywords"][0])
        query["blocked"] = "clouseau,{}".format(bugid)
        return bzdata["assigned_to"]
    return ""


def get_stats(data, buildid):
    """Get crash stats from Socorro to put in the bug report"""
    res = {}
    for i in data["facets"]["build_id"]:
        count = i["count"]
        facets = i["facets"]
        it = len(facets["install_time"])
        if it == 100:
            it = facets["cardinality_install_time"]["value"]
        res[i["term"]] = {"count": count, "installs": it}

    if len(res) == 1:
        return True, res[buildid]
    else:
        count = 0
        installs = 0
        for v in res.values():
            count += v["count"]
            installs += v["installs"]
        return False, {"count": count, "installs": installs}


def finalize_comment(bzquery, first, stats, info, changeset, bugid):
    """Finalize the comment to put in the bug report"""
    comment = bzquery["comment"][0]
    env = Environment(loader=FileSystemLoader("templates"))
    template = env.get_template("bug.txt")
    channel = info["channel"]
    url = Mercurial.get_repo_url(channel)
    url = "{}/rev?node={}".format(url, changeset)
    if channel == "nightly":
        version = "nightly {}".format(utils.get_major(info["version"]))
    else:
        version = info["version"]

    comment = template.render(
        socorro_comment=comment,
        count=stats["count"],
        installs=stats["installs"],
        version=version,
        buildid=info["buildid"],
        bugid=bugid,
        changeset_url=url,
        first=first,
    )
    comment = comment.replace("\\n", "\n")
    bzquery["comment"] = comment
    bzurl = "https://bugzilla.mozilla.org/enter_bug.cgi"
    return bzurl + "?" + urlencode(bzquery, True)


async def get_info_helper(uuid, changeset):
    info = models.UUID.get_info(uuid)
    bugid = models.Node.get_bugid(changeset, info["channel"])
    sgn = info["signature"]
    bzw, bugsdata = buginfo.get_bugs(sgn, wait=False)

    cs = "https://crash-stats.mozilla.org/report/index/" + uuid
    bz = "https://bugzilla.mozilla.org/rest/bug"
    bzh = {"X-Bugzilla-API-Key": libmozdata.config.get("Bugzilla", "token", "")}
    bzq = {"id": bugid, "include_fields": ["product", "component", "assigned_to"]}
    cs_api = "https://crash-stats.mozilla.org/api/SuperSearch/"
    cs_api_q = {
        "signature": "=" + info["signature"],
        "build_id": ">=" + info["buildid"],
        "product": info["product"],
        "release_channel": info["channel"],
        "_aggs.build_id": ["install_time", "_cardinality.install_time"],
        "_results_number": 0,
        "_facets": "release_channel",
        "_facets_size": 100,
    }

    loop = asyncio.get_event_loop()
    f1 = loop.run_in_executor(None, functools.partial(requests.get, cs))
    if bugid:
        f2 = loop.run_in_executor(
            None, functools.partial(requests.get, bz, headers=bzh, params=bzq)
        )
    f3 = loop.run_in_executor(
        None, functools.partial(requests.get, cs_api, params=cs_api_q)
    )
    r1 = await f1
    if bugid:
        r2 = await f2
    r3 = await f3
    bzquery = get_bz_query(r1.text)
    first, stats = get_stats(r3.json(), int(info["buildid"]))
    bzdata = r2.json() if bugid else {}
    ni = improve(bzquery, bzdata, bugid)
    url = finalize_comment(bzquery, first, stats, info, changeset, bugid)

    bzw.wait()

    return url, ni, sgn, bugsdata


def get_info(uuid, changeset):
    """Get the info (comment and Bugzilla stuff) to put in the bug report"""
    return asyncio.get_event_loop().run_until_complete(get_info_helper(uuid, changeset))