import os
import shutil
import sys
import subprocess

import utils

from config import NODE_NAMES, NODE_PORTS, COORDINATOR_NAME, USER, WORKER_PORTS, DBNAME


def initialize_temp_dir(temp_dir):
    if os.path.exists(temp_dir):
        shutil.rmtree(temp_dir)
    os.mkdir(temp_dir)
    # Give full access to TEMP_DIR so that postgres user can use it.
    os.chmod(temp_dir, 0o777)

def initialize_temp_dir_if_not_exists(temp_dir):
    if os.path.exists(temp_dir):
        return
    os.mkdir(temp_dir)
    # Give full access to TEMP_DIR so that postgres user can use it.
    os.chmod(temp_dir, 0o777)

def initialize_db_for_cluster(pg_path, rel_data_path, settings):
    subprocess.call(['mkdir', rel_data_path])
    for node_name in NODE_NAMES:
        abs_data_path = os.path.abspath(os.path.join(rel_data_path, node_name))
        command = [
            os.path.join(pg_path, 'initdb'),
            '--pgdata', abs_data_path,
            '--username', USER
        ]
        subprocess.call(command)
        add_settings(abs_data_path, settings)


def add_settings(abs_data_path, settings):
    conf_path = os.path.join(abs_data_path, 'postgresql.conf')
    with open(conf_path, 'a') as conf_file:
        for setting_key, setting_val in settings.items():
            setting = "{setting_key} = \'{setting_val}\'\n".format(
                setting_key=setting_key,
                setting_val=setting_val)
            conf_file.write(setting)


def start_databases(pg_path, rel_data_path):
    for node_name in NODE_NAMES:
        abs_data_path = os.path.abspath(os.path.join(rel_data_path, node_name))
        command = [
            os.path.join(pg_path, 'pg_ctl'), 'start',
            '--pgdata', abs_data_path,
            '-U', USER,
            '-o', '-p {}'.format(NODE_PORTS[node_name]),
            '--log', os.path.join(abs_data_path, 'logfile_' + node_name)
        ]
        subprocess.call(command)

def create_citus_extension(pg_path):
    for port in NODE_PORTS.values():
        utils.psql(pg_path, port, "CREATE EXTENSION citus;")

def run_pg_regress(pg_path, pg_srcdir, port, schedule):
    command = [
        os.path.join(pg_srcdir, 'src/test/regress/pg_regress'),
        '--port', str(port),
        '--schedule', schedule,
        '--bindir', pg_path,
        '--user', USER,
        '--dbname', DBNAME,
        '--use-existing'
    ]
    exit_code = subprocess.call(command)
    if exit_code != 0:
        sys.exit(exit_code)


def add_workers(pg_path):
    for port in WORKER_PORTS:
        command = "SELECT * from master_add_node('localhost', {port});".format(
            port=port)
        utils.psql(pg_path, NODE_PORTS[COORDINATOR_NAME], command)

def stop_databases(pg_path, rel_data_path):
    for node_name in NODE_NAMES:
        abs_data_path = os.path.abspath(os.path.join(rel_data_path, node_name))
        command = [
            os.path.join(pg_path, 'pg_ctl'), 'stop',
            '--pgdata', abs_data_path,
            '-U', USER,
            '-o', '-p {}'.format(NODE_PORTS[node_name]),
            '--log', os.path.join(abs_data_path, 'logfile_' + node_name)
        ]
        subprocess.call(command)


def initialize_citus_cluster(old_bindir, old_datadir, settings):
    initialize_db_for_cluster(old_bindir, old_datadir, settings)
    start_databases(old_bindir, old_datadir)
    create_citus_extension(old_bindir)
    add_workers(old_bindir)