# -*- coding: utf-8 -*-
# Part of Odoo, Flectra. See LICENSE file for full copyright and licensing details.

import logging
import logging.handlers
import os
import platform
import pprint
from . import release
import sys
import threading
import time

import psycopg2

import flectra
from . import sql_db
from . import tools

_logger = logging.getLogger(__name__)

def log(logger, level, prefix, msg, depth=None):
    indent=''
    indent_after=' '*len(prefix)
    for line in (prefix + pprint.pformat(msg, depth=depth)).split('\n'):
        logger.log(level, indent+line)
        indent=indent_after

path_prefix = os.path.realpath(os.path.dirname(os.path.dirname(__file__)))

class PostgreSQLHandler(logging.Handler):
    """ PostgreSQL Loggin Handler will store logs in the database, by default
    the current database, can be set using --log-db=DBNAME
    """
    def emit(self, record):
        ct = threading.current_thread()
        ct_db = getattr(ct, 'dbname', None)
        dbname = tools.config['log_db'] if tools.config['log_db'] and tools.config['log_db'] != '%d' else ct_db
        if not dbname:
            return
        with tools.ignore(Exception), tools.mute_logger('flectra.sql_db'), sql_db.db_connect(dbname, allow_uri=True).cursor() as cr:
            cr.autocommit(True)
            msg = tools.ustr(record.msg)
            if record.args:
                msg = msg % record.args
            traceback = getattr(record, 'exc_text', '')
            if traceback:
                msg = "%s\n%s" % (msg, traceback)
            # we do not use record.levelname because it may have been changed by ColoredFormatter.
            levelname = logging.getLevelName(record.levelno)

            val = ('server', ct_db, record.name, levelname, msg, record.pathname[len(path_prefix)+1:], record.lineno, record.funcName)
            cr.execute("""
                INSERT INTO ir_logging(create_date, type, dbname, name, level, message, path, line, func)
                VALUES (NOW() at time zone 'UTC', %s, %s, %s, %s, %s, %s, %s, %s)
            """, val)

BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, _NOTHING, DEFAULT = range(10)
#The background is set with 40 plus the number of the color, and the foreground with 30
#These are the sequences need to get colored ouput
RESET_SEQ = "\033[0m"
COLOR_SEQ = "\033[1;%dm"
BOLD_SEQ = "\033[1m"
COLOR_PATTERN = "%s%s%%s%s" % (COLOR_SEQ, COLOR_SEQ, RESET_SEQ)
LEVEL_COLOR_MAPPING = {
    logging.DEBUG: (BLUE, DEFAULT),
    logging.INFO: (GREEN, DEFAULT),
    logging.WARNING: (YELLOW, DEFAULT),
    logging.ERROR: (RED, DEFAULT),
    logging.CRITICAL: (WHITE, RED),
}

class PerfFilter(logging.Filter):
    def format_perf(self, query_count, query_time, remaining_time):
        return ("%d" % query_count, "%.3f" % query_time, "%.3f" % remaining_time)

    def filter(self, record):
        if hasattr(threading.current_thread(), "query_count"):
            query_count = threading.current_thread().query_count
            query_time = threading.current_thread().query_time
            perf_t0 = threading.current_thread().perf_t0
            remaining_time = time.time() - perf_t0 - query_time
            record.perf_info = '%s %s %s' % self.format_perf(query_count, query_time, remaining_time)
            delattr(threading.current_thread(), "query_count")
        else:
            record.perf_info = "- - -"
        return True

class ColoredPerfFilter(PerfFilter):
    def format_perf(self, query_count, query_time, remaining_time):
        def colorize_time(time, format, low=1, high=5):
            if time > high:
                return COLOR_PATTERN % (30 + RED, 40 + DEFAULT, format % time)
            if time > low:
                return COLOR_PATTERN % (30 + YELLOW, 40 + DEFAULT, format % time)
            return format % time
        return (
            colorize_time(query_count, "%d", 100, 1000),
            colorize_time(query_time, "%.3f", 0.1, 3),
            colorize_time(remaining_time, "%.3f", 1, 5)
            )

class DBFormatter(logging.Formatter):
    def format(self, record):
        record.pid = os.getpid()
        record.dbname = getattr(threading.current_thread(), 'dbname', '?')
        return logging.Formatter.format(self, record)

class ColoredFormatter(DBFormatter):
    def format(self, record):
        fg_color, bg_color = LEVEL_COLOR_MAPPING.get(record.levelno, (GREEN, DEFAULT))
        record.levelname = COLOR_PATTERN % (30 + fg_color, 40 + bg_color, record.levelname)
        return DBFormatter.format(self, record)

_logger_init = False
def init_logger():
    global _logger_init
    if _logger_init:
        return
    _logger_init = True

    old_factory = logging.getLogRecordFactory()
    def record_factory(*args, **kwargs):
        record = old_factory(*args, **kwargs)
        record.perf_info = ""
        return record
    logging.setLogRecordFactory(record_factory)

    logging.addLevelName(25, "INFO")
    logging.captureWarnings(True)

    from .tools.translate import resetlocale
    resetlocale()

    # create a format for log messages and dates
    format = '%(asctime)s %(pid)s %(levelname)s %(dbname)s %(name)s: %(message)s %(perf_info)s'
    # Normal Handler on stderr
    handler = logging.StreamHandler()

    if tools.config['syslog']:
        # SysLog Handler
        if os.name == 'nt':
            handler = logging.handlers.NTEventLogHandler("%s %s" % (release.description, release.version))
        elif platform.system() == 'Darwin':
            handler = logging.handlers.SysLogHandler('/var/run/log')
        else:
            handler = logging.handlers.SysLogHandler('/dev/log')
        format = '%s %s' % (release.description, release.version) \
                + ':%(dbname)s:%(levelname)s:%(name)s:%(message)s'

    elif tools.config['logfile']:
        # LogFile Handler
        logf = tools.config['logfile']
        try:
            # We check we have the right location for the log files
            dirname = os.path.dirname(logf)
            if dirname and not os.path.isdir(dirname):
                os.makedirs(dirname)
            if tools.config['logrotate'] is not False:
                if tools.config['workers'] and tools.config['workers'] > 1:
                    # TODO: fallback to regular file logging in master for safe(r) defaults?
                    #
                    # Doing so here would be a good idea but also might break
                    # situations were people do log-shipping of rotated data?
                    _logger.warn("WARNING: built-in log rotation is not reliable in multi-worker scenarios and may incur significant data loss. "
                                 "It is strongly recommended to use an external log rotation utility or use system loggers (--syslog) instead.")
                handler = logging.handlers.TimedRotatingFileHandler(filename=logf, when='D', interval=1, backupCount=30)
            elif os.name == 'posix':
                handler = logging.handlers.WatchedFileHandler(logf)
            else:
                handler = logging.FileHandler(logf)
        except Exception:
            sys.stderr.write("ERROR: couldn't create the logfile directory. Logging to the standard output.\n")

    # Check that handler.stream has a fileno() method: when running OpenERP
    # behind Apache with mod_wsgi, handler.stream will have type mod_wsgi.Log,
    # which has no fileno() method. (mod_wsgi.Log is what is being bound to
    # sys.stderr when the logging.StreamHandler is being constructed above.)
    def is_a_tty(stream):
        return hasattr(stream, 'fileno') and os.isatty(stream.fileno())

    if os.name == 'posix' and isinstance(handler, logging.StreamHandler) and is_a_tty(handler.stream):
        formatter = ColoredFormatter(format)
        perf_filter = ColoredPerfFilter()
    else:
        formatter = DBFormatter(format)
        perf_filter = PerfFilter()
    handler.setFormatter(formatter)
    logging.getLogger().addHandler(handler)
    logging.getLogger('werkzeug').addFilter(perf_filter)

    if tools.config['log_db']:
        db_levels = {
            'debug': logging.DEBUG,
            'info': logging.INFO,
            'warning': logging.WARNING,
            'error': logging.ERROR,
            'critical': logging.CRITICAL,
        }
        postgresqlHandler = PostgreSQLHandler()
        postgresqlHandler.setLevel(int(db_levels.get(tools.config['log_db_level'], tools.config['log_db_level'])))
        logging.getLogger().addHandler(postgresqlHandler)

    # Configure loggers levels
    pseudo_config = PSEUDOCONFIG_MAPPER.get(tools.config['log_level'], [])

    logconfig = tools.config['log_handler']

    logging_configurations = DEFAULT_LOG_CONFIGURATION + pseudo_config + logconfig
    for logconfig_item in logging_configurations:
        loggername, level = logconfig_item.split(':')
        level = getattr(logging, level, logging.INFO)
        logger = logging.getLogger(loggername)
        logger.setLevel(level)

    for logconfig_item in logging_configurations:
        _logger.debug('logger level set: "%s"', logconfig_item)


DEFAULT_LOG_CONFIGURATION = [
    'flectra.http.rpc.request:INFO',
    'flectra.http.rpc.response:INFO',
    ':INFO',
]
PSEUDOCONFIG_MAPPER = {
    'debug_rpc_answer': ['flectra:DEBUG', 'flectra.sql_db:INFO', 'flectra.http.rpc:DEBUG'],
    'debug_rpc': ['flectra:DEBUG', 'flectra.sql_db:INFO', 'flectra.http.rpc.request:DEBUG'],
    'debug': ['flectra:DEBUG', 'flectra.sql_db:INFO'],
    'debug_sql': ['flectra.sql_db:DEBUG'],
    'info': [],
    'warn': ['flectra:WARNING', 'werkzeug:WARNING'],
    'error': ['flectra:ERROR', 'werkzeug:ERROR'],
    'critical': ['flectra:CRITICAL', 'werkzeug:CRITICAL'],
}