# -*- coding: utf-8 -*-

import os
import time
import sqlite3
import traceback

from datetime import datetime
from pathlib import Path

from colorama import Fore
from colorama import Back
from colorama import Style

from functools import (
    reduce, partial, wraps
)

##########
# TIMERS #
##########

_timers = {}
_calls = {}

def reset_timers():
    global _timers
    global _calls

    _timers = {}
    _calls = {}

def display_timers():
    global _timers
    global _calls

    fmax = max(
        map(
            lambda f: len(f.__qualname__) + len(f.__module__),
            _timers
        )
    )

    head = " +--"
    head += f"{Style.BRIGHT}{Fore.BLUE}Timers{Style.RESET_ALL}"
    for t in range(fmax + 26):
        head += "-"
    head += "+"
    print(head)

    lst = sorted(
        map(
            lambda f: (f, _timers[f], _calls[f]),
            _timers
        ),
        key = lambda f: f[1],
        reverse = True
    )

    for func, time, calls in lst:
        name = (f"{Fore.BLUE}{func.__module__}{Style.RESET_ALL}" +
                f".{Style.BRIGHT}{Fore.GREEN}{func.__qualname__:<{fmax - len(func.__module__)}}{Style.RESET_ALL}")
        print(f" | {name} | {time:>10.6f} sec | {calls:>5} calls |")

    tail = " +--"
    for t in range(fmax + 32):
        tail += "-"
    tail += "+"
    print(tail)

def timer(func):
    """Function wrapper to register function runtime"""
    @wraps(func)
    def wrapper(*args, **kwargs):
        start_time = time.perf_counter()

        value = None
        try:
            value = func(*args, **kwargs)
        except Exception as e:
            print(f"[{Fore.RED}ERROR{Style.RESET_ALL}]" +
                  f"[{func.__module__}.{Fore.GREEN}{func.__qualname__}{Style.RESET_ALL}]: " +
                  f"{Fore.RED}{e}{Style.RESET_ALL}")
            traceback.print_exc()

        end_time = time.perf_counter()
        run_time = end_time - start_time

        _timers[func] += run_time
        _calls[func] += 1

        return value

    _timers[func] = 0
    _calls[func] = 0

    return wrapper

#########
# DEBUG #
#########

def trace(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        t = time.ctime()
        head = f"[{Fore.BLUE}TRACE{Style.RESET_ALL}]"
        c = f"{head}[{t}] Call {func.__module__}.{Fore.GREEN}{func.__qualname__}{Style.RESET_ALL}({args}, {kwargs})"
        print(c)

        value = func(*args, **kwargs)

        t = time.ctime()
        r = f"{head}[{t}] Return {func.__module__}.{Fore.GREEN}{func.__qualname__}{Style.RESET_ALL}: {value}"
        print(r)

        return value

    return wrapper

################
# OTHERS TOOLS #
################

@timer
def flatten(lst):
    """Flatten list of list

    Args:
        lst: A list of list

    Returns:
        returns a list of element
    """
    if not lst:
        return []

    return reduce(list.__add__, lst)

def timestamp(dt:datetime):
    # Fix timestamp for some windows version.
    # - Issue : (https://bugs.python.org/issue29097)
    if os.name == 'nt':
        return (dt - datetime(1970, 1, 1)).total_seconds()
    return dt.timestamp()

def old_pamhyr_date_to_timestamp(date:str):
    v = date.split(":")
    if len(v) != 4:
        return 0

    m = [
        (24 * 60 * 60),         # Day to sec
        (60 * 60),              # Hour to sec
        60,                     # Minute to sec
        1                       # Sec
    ]

    ts = reduce(
        lambda acc, x: acc + x,
        map(
            lambda v, m: int(v) * int(m),
            v, m
        )
    )

    return ts

#######
# SQL #
#######

# This class is an abstract class to make class with save and load
# from sqlite3.

class SQL(object):
    def _init_db_file(self, db):
        exists = Path(db).exists()

        self._db = sqlite3.connect(db)
        self._cur = self._db.cursor()

        if not exists:
            self._create()      # Create db
            self._save()        # Save
        else:
            self._update()      # Update db scheme if necessary
            self._load()        # Load data


    def __init__(self, filename = None):
        self._db = None

        if filename is not None:
            self._init_db_file(filename)

    def commit(self):
        self._db.commit()

    def _fetch_string(self, s):
        return s.replace("&#39;", "'")

    def _fetch_tuple(self, tup):
        res = []
        for v in tup:
            if type(v) == str:
                v = self._fetch_string(v)
            res.append(v)

        return res

    def _fetch_list(self, lst):
        res = []
        for v in lst:
            if type(v) == str:
                v = self._fetch_string(v)
            elif type(v) == tuple:
                v = self._fetch_tuple(v)
            res.append(v)

        return res

    def _fetch(self, res, one):
        if one:
            value = res.fetchone()
        else:
            value = res.fetchall()
        res = value

        if type(value) == list:
            res = self._fetch_list(value)
        elif type(value) == tuple:
            res = self._fetch_tuple(value)

        return res

    def _sql_format(self, value):
        # Replace ''' by '&#39;' to preserve SQL injection
        if type(value) == str:
            value = value.replace("'", "&#39;")
        return value

    @timer
    def execute(self, cmd, fetch_one = True, commit = False):
        # print(f"[SQL] {cmd}")
        res = self._cur.execute(cmd)

        if commit:
            self._db.commit()

        value = self._fetch(res, fetch_one)
        return value

    def _create(self):
        print("TODO: Create")

    def _update(self):
        print("TODO: Update")

    def _save(self):
        print("TODO: Save")

    def _load(self):
        print("TODO: Load")