#!/usr/bin/env python
# coding=utf-8
# -------------------------------------------------------------------------------
# ESPurna OTA manager
# xose.perez@gmail.com
#
# Requires PlatformIO Core
# -------------------------------------------------------------------------------
from __future__ import print_function

import argparse
import os
import re
import shutil
import socket
import subprocess
import sys
import time

from zeroconf import ServiceBrowser, ServiceStateChange, Zeroconf

try:
    # noinspection PyUnresolvedReferences
    input = raw_input  # Python2    *!! redefining build-in input.
except NameError:
    pass  # Python3

# -------------------------------------------------------------------------------

DISCOVER_TIMEOUT = 2

description = "ESPurna OTA Manager v0.3"
devices = []
discover_last = 0


# -------------------------------------------------------------------------------

def on_service_state_change(zeroconf, service_type, name, state_change):
    """
    Callback that adds discovered devices to "devices" list
    """

    global discover_last

    if state_change is ServiceStateChange.Added:
        discover_last = time.time()
        info = zeroconf.get_service_info(service_type, name)
        if info:

            hostname = info.server.split(".")[0]
            device = {
                'hostname': hostname.upper(),
                'ip': socket.inet_ntoa(info.address),
                'mac': '',
                'app_name': '',
                'app_version': '',
                'target_board': '',
                'mem_size': 0,
                'sdk_size': 0,
                'free_space': 0,
            }

            for key, item in info.properties.items():
                device[key.decode('UTF-8')] = item.decode('UTF-8')

            # rename fields (needed for sorting by name)
            device['app'] = device['app_name']
            device['device'] = device['target_board']
            device['version'] = device['app_version']

            devices.append(device)


def list_devices():
    """
    Shows the list of discovered devices
    """
    output_format = "{:>3}  {:<14}  {:<15}  {:<17}  {:<12}  {:<12}  {:<25}  {:<8}  {:<8}  {:<10}"
    print(output_format.format(
            "#",
            "HOSTNAME",
            "IP",
            "MAC",
            "APP",
            "VERSION",
            "DEVICE",
            "MEM_SIZE",
            "SDK_SIZE",
            "FREE_SPACE"
    ))
    print("-" * 139)

    index = 0
    for device in devices:
        index += 1
        print(output_format.format(
                index,
                device.get('hostname', ''),
                device.get('ip', ''),
                device.get('mac', ''),
                device.get('app_name', ''),
                device.get('app_version', ''),
                device.get('target_board', ''),
                device.get('mem_size', 0),
                device.get('sdk_size', 0),
                device.get('free_space', 0),
        ))

    print()


def get_boards():
    """
    Grabs board types fro hardware.h file
    """
    boards = []
    for line in open("espurna/config/hardware.h"):
        m = re.search(r'defined\((\w*)\)', line)
        if m:
            boards.append(m.group(1))
    return sorted(boards)


def get_device_size(device):
    if device.get('mem_size', 0) == device.get('sdk_size', 0):
        return int(device.get('mem_size', 0)) / 1024
    return 0


def get_empty_board():
    """
    Returns the empty structure of a board to flash
    """
    board = {'board': '', 'ip': '', 'size': 0, 'auth': '', 'flags': ''}
    return board


def get_board_by_index(index):
    """
    Returns the required data to flash a given board
    """
    board = {}
    if 1 <= index <= len(devices):
        device = devices[index - 1]
        board['hostname'] = device.get('hostname')
        board['board'] = device.get('target_board', '')
        board['ip'] = device.get('ip', '')
        board['size'] = get_device_size(device)
    return board


def get_board_by_mac(mac):
    """
    Returns the required data to flash a given board
    """
    for device in devices:
        if device.get('mac', '').lower() == mac:
            board = {}
            board['hostname'] = device.get('hostname')
            board['board'] = device.get('device')
            board['ip'] = device.get('ip')
            board['size'] = get_device_size(device)
            if not board['board'] or not board['ip'] or board['size'] == 0:
                return None
            return board
    return None


def get_board_by_hostname(hostname):
    """
    Returns the required data to flash a given board
    """
    hostname = hostname.lower()
    for device in devices:
        if device.get('hostname', '').lower() == hostname:
            board = {}
            board['hostname'] = device.get('hostname')
            board['board'] = device.get('target_board')
            board['ip'] = device.get('ip')
            board['size'] = get_device_size(device)
            if not board['board'] or not board['ip'] or board['size'] == 0:
                return None
            return board
    return None


def input_board():
    """
    Grabs info from the user about what device to flash
    """

    # Choose the board
    try:
        index = int(input("Choose the board you want to flash (empty if none of these): "))
    except ValueError:
        index = 0
    if index < 0 or len(devices) < index:
        print("Board number must be between 1 and {}\n".format(str(len(devices))))
        return None

    board = get_board_by_index(index)

    # Choose board type if none before
    if len(board.get('board', '')) == 0:

        print()
        count = 1
        boards = get_boards()
        for name in boards:
            print("{:3d}\t{}".format(count, name))
            count += 1
        print()
        try:
            index = int(input("Choose the board type you want to flash: "))
        except ValueError:
            index = 0
        if index < 1 or len(boards) < index:
            print("Board number must be between 1 and {}\n".format(str(len(boards))))
            return None
        board['board'] = boards[index - 1]

    # Choose board size of none before
    if board.get('size', 0) == 0:
        try:
            board['size'] = int(input("Board memory size (1 for 1M, 2 for 2M, 4 for 4M): "))
        except ValueError:
            print("Wrong memory size")
            return None

    # Choose IP of none before
    if len(board.get('ip', '')) == 0:
        board['ip'] = input("IP of the device to flash (empty for 192.168.4.1): ") or "192.168.4.1"

    return board


def boardname(board):
    return board.get('hostname', board['ip'])


def store(device, env):
    source = ".pio/build/{}/firmware.elf".format(env)
    destination = ".pio/build/elfs/{}.elf".format(boardname(device).lower())

    dst_dir = os.path.dirname(destination)
    if not os.path.exists(dst_dir):
        os.mkdir(dst_dir)

    shutil.move(source, destination)


def run(device, env):
    print("Building and flashing image over-the-air...")
    environ = os.environ.copy()
    environ["ESPURNA_IP"] = device["ip"]
    environ["ESPURNA_BOARD"] = device["board"]
    environ["ESPURNA_AUTH"] = device["auth"]
    environ["ESPURNA_FLAGS"] = device["flags"]
    environ["ESPURNA_PIO_SHARED_LIBRARIES"] = "y"

    command = ("platformio", "run", "--silent", "--environment", env, "-t", "upload")
    subprocess.check_call(command, env=environ)

    store(device, env)


# -------------------------------------------------------------------------------

if __name__ == '__main__':

    # Parse command line options
    parser = argparse.ArgumentParser(description=description)
    parser.add_argument("-c", "--core", help="flash ESPurna core", default=0, action='count')
    parser.add_argument("-f", "--flash", help="flash device", default=0, action='count')
    parser.add_argument("-o", "--flags", help="extra flags", default='')
    parser.add_argument("-p", "--password", help="auth password", default='')
    parser.add_argument("-s", "--sort", help="sort devices list by field", default='hostname')
    parser.add_argument("-y", "--yes", help="do not ask for confirmation", default=0, action='count')
    parser.add_argument("hostnames", nargs='*', help="Hostnames to update")
    args = parser.parse_args()

    print()
    print(description)
    print()

    # Look for services
    zeroconf = Zeroconf()
    browser = ServiceBrowser(zeroconf, "_arduino._tcp.local.", handlers=[on_service_state_change])
    discover_last = time.time()
    while time.time() < discover_last + DISCOVER_TIMEOUT:
        pass
    # zeroconf.close()

    if len(devices) == 0:
        print("Nothing found!\n")
        sys.exit(0)

    # Sort list
    field = args.sort.lower()
    if field not in devices[0]:
        print("Unknown field '{}'\n".format(field))
        sys.exit(1)
    devices = sorted(devices, key=lambda device: device.get(field, ''))

    # List devices
    list_devices()

    # Flash device
    if args.flash > 0:

        # Board(s) to flash
        queue = []

        # Check if hostnames
        for hostname in args.hostnames:
            board = get_board_by_hostname(hostname)
            if board:
                board['auth'] = args.password
                board['flags'] = args.flags
                queue.append(board)

        # If no boards ask the user
        if len(queue) == 0:
            board = input_board()
            if board:
                board['auth'] = args.password or input("Authorization key of the device to flash: ")
                board['flags'] = args.flags or input("Extra flags for the build: ")
                queue.append(board)

        # If still no boards quit
        if len(queue) == 0:
            sys.exit(0)

        queue = sorted(queue, key=lambda device: device.get('board', ''))

        # Flash each board
        for board in queue:

            # Flash core version?
            if args.core > 0:
                board['flags'] = "-DESPURNA_CORE " + board['flags']

            env = "esp8266-{:d}m-ota".format(board['size'])

            # Summary
            print()
            print("HOST    = {}".format(boardname(board)))
            print("IP      = {}".format(board['ip']))
            print("BOARD   = {}".format(board['board']))
            print("AUTH    = {}".format(board['auth']))
            print("FLAGS   = {}".format(board['flags']))
            print("ENV     = {}".format(env))

            response = True
            if args.yes == 0:
                response = (input("\nAre these values right [y/N]: ") == "y")
            if response:
                print()
                run(board, env)