#!/usr/bin/env python3
# encoding: utf-8

import os

from shutil import copyfile

from .cmd import run_bash_cmd
from .utils import print_title

PV_ARGS = 'pv --timer --rate --eta'
MYSQL_BACKUP_ARGS = '--add-drop-database --add-drop-table --add-locks --single-transaction --quick '


class DB():
    def __init__(self, config=None, database="", host='127.0.0.1', user='root', passwd=None, port=3306):

        import MySQLdb

        values = {
            'db_port': 3306,
            'db_host': '127.0.0.1',
        }
        if config:
            primary_master_config = getattr(config, 'primary_master_config', None)
            assert (primary_master_config)
            values.update(vars(primary_master_config))
            db = MySQLdb.connect(
                host=values['db_host'],
                user=values['db_user'],
                passwd=values['db_password'],
                db=database,
                charset='utf8',
                port=int(values['db_port']),
            )
        elif host:
            keys = ['host', 'user', 'passwd', 'db', 'charset', 'port']
            params = {'charset': 'utf8'}
            for key in keys:
                value = locals().get(key)
                if value:
                    params[key] = value
            db = MySQLdb.connect(**params)
        assert db
        self.database = database
        self.cursor = db.cursor()

    def fetchone(self, sql):
        self.cursor.execute(sql)
        return self.cursor.fetchone()[0]

    def fetchall(self, sql):
        self.cursor.execute(sql)
        return self.cursor.fetchall()

    def get_databases(self, light=False):
        if self.database:
            return [self.database]
        ret = [i[0] for i in self.fetchall('show databases')]
        ret = sorted(list(set(ret) - set(['information_schema', 'mysql', 'performance_schema', 'test'])))
        if light == True:
            ret = sorted(list(set(ret) - set(['yunionmeter', 'yunionlogger'])))
        return ret

    def get_tables(self, exclude_prefix=''):
        ret = [i[0] for i in self.fetchall('show tables')]
        if not exclude_prefix:
            return ret
        else:
            return [i for i in ret if i.startswith(exclude_prefix)]

    def gen_export_args(self):
        ret = []
        for i in self.get_tables('opslog_tbl_') + self.get_tables('task'):
            ret.append('--ignore-table=%s.%s' % (self.database, i))
        return ' '.join(ret)

    def get_db_size(self, dbs=[], tables=[], ignores=''):
        sql = 'SELECT ROUND(SUM(data_length)) AS "size_bytes" FROM information_schema.TABLES'
        if dbs:
            db_name_str = ', '.join(['"%s"' % i for i in dbs])
            sql += ' where TABLE_SCHEMA in (%s)' % db_name_str
            if tables:
                db_name_str = ','.join(['"%s"' % i for i in tables])
                sql += ' and TABLE_NAME in (%s)' % db_name_str
            if ignores:
                ignores = ignores.replace('--ignore-table=', '').replace('  ', ' ')
                ignores = ignores.split(' ')
                ignores = ', '.join(['"%s"' % i for i in ignores if i])
                ignores = ' and CONCAT(TABLE_SCHEMA, ".", TABLE_NAME) not in (%s)' % ignores
                sql += ignores
        return int(self.fetchone(sql))


def gen_db_config_args(config):

    values = {
        'db_port': 3306,
        'db_host': '127.0.0.1',
    }

    primary_master_config = getattr(config, 'primary_master_config', None)
    assert (primary_master_config)
    values.update(vars(primary_master_config))
    return ' -h "%(db_host)s" -u "%(db_user)s" -p"%(db_password)s" -P "%(db_port)s" ' % values


def backup_db_table(config, db, table):

    fn = '%s.%s.sql' % (db, table)
    tgz = '%s.%s.sql.gz' % (db, table)
    _db = DB(config)
    db_size = _db.get_db_size([db], [table])
    db_args = gen_db_config_args(config)
    mysql_backup_args = MYSQL_BACKUP_ARGS

    cmd = 'mysqldump %(mysql_backup_args)s --databases %(db)s %(db_args)s --tables %(table)s ' % locals()  # + ' --result-file ' + fn
    cmd += ' | %(PV_ARGS)s --name " Dumping %(name)s" --size %(db_size)s' % {
        'PV_ARGS': PV_ARGS,
        'db_size': db_size,
        'name': db + '.' + table,
    }
    cmd += '| gzip -c > %(tgz)s' % locals()
    print('backup cmd: `%s`' % cmd)
    # run_bash_cmd(cmd)


def backup_db(config, backup_path, light=False):
    print_title('back up db...')
    os.chdir(backup_path)
    ignores = ''
    dbs = DB(config)
    mysql_backup_args = MYSQL_BACKUP_ARGS

    if light is True:
        for dbname in dbs.get_databases(light):
            db = DB(config, dbname)
            ignores += ' ' + db.gen_export_args()

    db_name_str = ' '.join(dbs.get_databases(light))

    tgz = '%s/onecloud.sql.gz' % backup_path
    cmd = 'mysqldump %(mysql_backup_args)s --databases ' % locals() + db_name_str + ' ' \
        + gen_db_config_args(config) + ignores

    db_size = dbs.get_db_size(dbs.get_databases(), ignores=ignores)
    cmd += ' | %(PV_ARGS)s --name " Dumping Database" --size %(db_size)s' % {
        'PV_ARGS': PV_ARGS,
        'db_size': db_size,
    }
    cmd += ' | gzip -c > %s' % tgz

    run_bash_cmd(cmd)
    run_bash_cmd('ls -lah %s/*gz' % backup_path)


def backup_config(src, dest):
    print_title('backing up the config')
    output = os.path.join(dest, 'config.yml')
    print('backup config %s to %s... ' % (src, output))
    run_bash_cmd('mkdir -p "%s"' % dest)
    copyfile(src, output)
    run_bash_cmd(""" sed -i -e 's@^  iso_install_mode: true@#  iso_install_mode: true@' '%s' """ % output)