# Infinite push
#
# Copyright 2016 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.


import logging
import os
import time

import warnings
import mysql.connector

from . import indexapi


def _convertbookmarkpattern(pattern):
    pattern = pattern.replace(b'_', b'\\_')
    pattern = pattern.replace(b'%', b'\\%')
    if pattern.endswith(b'*'):
        pattern = pattern[:-1] + b'%'
    return pattern


class sqlindexapi(indexapi.indexapi):
    """
    Sql backend for infinitepush index. See schema.sql
    """

    def __init__(
        self,
        reponame,
        host,
        port,
        database,
        user,
        password,
        logfile,
        loglevel,
        waittimeout=300,
        locktimeout=120,
    ):
        super(sqlindexapi, self).__init__()
        self.reponame = reponame
        self.sqlargs = {
            b'host': host,
            b'port': port,
            b'database': database,
            b'user': user,
            b'password': password,
        }
        self.sqlconn = None
        self.sqlcursor = None
        if not logfile:
            logfile = os.devnull
        logging.basicConfig(filename=logfile)
        self.log = logging.getLogger()
        self.log.setLevel(loglevel)
        self._connected = False
        self._waittimeout = waittimeout
        self._locktimeout = locktimeout

    def sqlconnect(self):
        if self.sqlconn:
            raise indexapi.indexexception(b"SQL connection already open")
        if self.sqlcursor:
            raise indexapi.indexexception(
                b"SQL cursor already open without connection"
            )
        retry = 3
        while True:
            try:
                self.sqlconn = mysql.connector.connect(**self.sqlargs)

                # Code is copy-pasted from hgsql. Bug fixes need to be
                # back-ported!
                # The default behavior is to return byte arrays, when we
                # need strings. This custom convert returns strings.
                self.sqlconn.set_converter_class(CustomConverter)
                self.sqlconn.autocommit = False
                break
            except mysql.connector.errors.Error:
                # mysql can be flakey occasionally, so do some minimal
                # retrying.
                retry -= 1
                if retry == 0:
                    raise
                time.sleep(0.2)

        waittimeout = self.sqlconn.converter.escape(b'%s' % self._waittimeout)

        self.sqlcursor = self.sqlconn.cursor()
        self.sqlcursor.execute(b"SET wait_timeout=%s" % waittimeout)
        self.sqlcursor.execute(
            b"SET innodb_lock_wait_timeout=%s" % self._locktimeout
        )
        self._connected = True

    def close(self):
        """Cleans up the metadata store connection."""
        with warnings.catch_warnings():
            warnings.simplefilter(b"ignore")
            self.sqlcursor.close()
            self.sqlconn.close()
        self.sqlcursor = None
        self.sqlconn = None

    def __enter__(self):
        if not self._connected:
            self.sqlconnect()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        if exc_type is None:
            self.sqlconn.commit()
        else:
            self.sqlconn.rollback()

    def addbundle(self, bundleid, nodesctx):
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"ADD BUNDLE %r %r" % (self.reponame, bundleid))
        self.sqlcursor.execute(
            b"INSERT INTO bundles(bundle, reponame) VALUES (%s, %s)",
            params=(bundleid, self.reponame),
        )
        for ctx in nodesctx:
            self.sqlcursor.execute(
                b"INSERT INTO nodestobundle(node, bundle, reponame) "
                b"VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE "
                b"bundle=VALUES(bundle)",
                params=(ctx.hex(), bundleid, self.reponame),
            )

            extra = ctx.extra()
            author_name = ctx.user()
            committer_name = extra.get(b'committer', ctx.user())
            author_date = int(ctx.date()[0])
            committer_date = int(extra.get(b'committer_date', author_date))
            self.sqlcursor.execute(
                b"INSERT IGNORE INTO nodesmetadata(node, message, p1, p2, "
                b"author, committer, author_date, committer_date, "
                b"reponame) VALUES "
                b"(%s, %s, %s, %s, %s, %s, %s, %s, %s)",
                params=(
                    ctx.hex(),
                    ctx.description(),
                    ctx.p1().hex(),
                    ctx.p2().hex(),
                    author_name,
                    committer_name,
                    author_date,
                    committer_date,
                    self.reponame,
                ),
            )

    def addbookmark(self, bookmark, node):
        """Takes a bookmark name and hash, and records mapping in the metadata
        store."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"ADD BOOKMARKS %r bookmark: %r node: %r"
            % (self.reponame, bookmark, node)
        )
        self.sqlcursor.execute(
            b"INSERT INTO bookmarkstonode(bookmark, node, reponame) "
            b"VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE node=VALUES(node)",
            params=(bookmark, node, self.reponame),
        )

    def addmanybookmarks(self, bookmarks):
        if not self._connected:
            self.sqlconnect()
        args = []
        values = []
        for bookmark, node in bookmarks.items():
            args.append(b'(%s, %s, %s)')
            values.extend((bookmark, node, self.reponame))
        args = b','.join(args)

        self.sqlcursor.execute(
            b"INSERT INTO bookmarkstonode(bookmark, node, reponame) "
            b"VALUES %s ON DUPLICATE KEY UPDATE node=VALUES(node)" % args,
            params=values,
        )

    def deletebookmarks(self, patterns):
        """Accepts list of bookmark patterns and deletes them.
        If `commit` is set then bookmark will actually be deleted. Otherwise
        deletion will be delayed until the end of transaction.
        """
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"DELETE BOOKMARKS: %s" % patterns)
        for pattern in patterns:
            pattern = _convertbookmarkpattern(pattern)
            self.sqlcursor.execute(
                b"DELETE from bookmarkstonode WHERE bookmark LIKE (%s) "
                b"and reponame = %s",
                params=(pattern, self.reponame),
            )

    def getbundle(self, node):
        """Returns the bundleid for the bundle that contains the given node."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(b"GET BUNDLE %r %r" % (self.reponame, node))
        self.sqlcursor.execute(
            b"SELECT bundle from nodestobundle "
            b"WHERE node = %s AND reponame = %s",
            params=(node, self.reponame),
        )
        result = self.sqlcursor.fetchall()
        if len(result) != 1 or len(result[0]) != 1:
            self.log.info(b"No matching node")
            return None
        bundle = result[0][0]
        self.log.info(b"Found bundle %r" % bundle)
        return bundle

    def getnode(self, bookmark):
        """Returns the node for the given bookmark. None if it doesn't exist."""
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"GET NODE reponame: %r bookmark: %r" % (self.reponame, bookmark)
        )
        self.sqlcursor.execute(
            b"SELECT node from bookmarkstonode WHERE "
            b"bookmark = %s AND reponame = %s",
            params=(bookmark, self.reponame),
        )
        result = self.sqlcursor.fetchall()
        if len(result) != 1 or len(result[0]) != 1:
            self.log.info(b"No matching bookmark")
            return None
        node = result[0][0]
        self.log.info(b"Found node %r" % node)
        return node

    def getbookmarks(self, query):
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            b"QUERY BOOKMARKS reponame: %r query: %r" % (self.reponame, query)
        )
        query = _convertbookmarkpattern(query)
        self.sqlcursor.execute(
            b"SELECT bookmark, node from bookmarkstonode WHERE "
            b"reponame = %s AND bookmark LIKE %s",
            params=(self.reponame, query),
        )
        result = self.sqlcursor.fetchall()
        bookmarks = {}
        for row in result:
            if len(row) != 2:
                self.log.info(b"Bad row returned: %s" % row)
                continue
            bookmarks[row[0]] = row[1]
        return bookmarks

    def saveoptionaljsonmetadata(self, node, jsonmetadata):
        if not self._connected:
            self.sqlconnect()
        self.log.info(
            (
                b"INSERT METADATA, QUERY BOOKMARKS reponame: %r "
                + b"node: %r, jsonmetadata: %s"
            )
            % (self.reponame, node, jsonmetadata)
        )

        self.sqlcursor.execute(
            b"UPDATE nodesmetadata SET optional_json_metadata=%s WHERE "
            b"reponame=%s AND node=%s",
            params=(jsonmetadata, self.reponame, node),
        )


class CustomConverter(mysql.connector.conversion.MySQLConverter):
    """Ensure that all values being returned are returned as python string
    (versus the default byte arrays)."""

    def _STRING_to_python(self, value, dsc=None):
        return str(value)

    def _VAR_STRING_to_python(self, value, dsc=None):
        return str(value)

    def _BLOB_to_python(self, value, dsc=None):
        return str(value)