#!/usr/bin/env python3

# The main module that brings everything together.

from sys import argv
from database import Database
import scripter
import sys
import time


def print_list(list_of_items):
    # Print all the items in a list. Used for printing each Pokemon from a particular region.
    print("\n".join(str(item) for item in list_of_items))


def print_columns(items):
    # Print a list as multiple columns instead of just one.
    rows = []
    items_per_column = int(len(items) / 4) + 1
    for index, pokemon in enumerate(items):
        if not pokemon.is_extra():
            name = pokemon.get_id() + " " + str(pokemon.get_name()).capitalize()
        else:
            name = "--- " + pokemon.get_name()
        name = name.ljust(20)
        if len(rows) < items_per_column:
            rows.append(name)
        else:
            rows[index % items_per_column] += name
    print_list(rows)


def prefix_search(db, arg):
    # Find all Pokemon in database, db, with the prefix, arg.
    result = db.names_with_prefix(arg)
    if len(result) == 0:
        print("No Pokemon found with prefix '" + arg + "'.")
    else:
        print_columns(result)


def print_extra(db):
    # Print all the 'Extra' Pokemon from the 'Extra' folder.
    result = db.get_extra()
    if len(result) == 0:
        print("No Pokemon were found in Images/Extra.")
    else:
        print_columns(result)


def print_usage():
    # Print the instructions of usage.
    print(
        '''
Usage:
    pokemon [parameter]
    ichooseyou [parameter]

Parameters:
    [name]        -   Change the terminal background to the specified Pokemon.
    [index]       -   Change the terminal background to a Pokemon by its index.
    [region]      -   List all the Pokemon of the specified region.
    [one letter]  -   List all Pokemon who's names begin with a particular letter.
    [two letters] -   List all Pokemon who's names begin with those two letters.

Other Parameters:
    pokemon all                    -   List all the Pokemon supported.
    pokemon regions                -   List all the available regions.
    pokemon extra                  -   List all the Pokemon from the 'Extra' folder.
    pokemon random                 -   Change the terminal background to a random Pokemon.
    pokemon random-kanto           -   Change the terminal background to a random Pokemon from the specified region.
    pokemon slideshow [time]       -   Iterate through each Pokemon. Optional time (in seconds) between Pokemon.
    pokemon slideshow-kanto [time] -   Iterate through each Pokemon in the specified region. Optional time (in seconds) between Pokemon.
    pokemon clear | disable | off  -   Clear the Pokemon in the terminal.
    pokemon help                   -   Display this menu.

Wallpaper Parameters:
    pokemon _pikachu               -   Change the wallpaper to the specified Pokemon.
    pokemon _random                -   Change the wallpaper to a random Pokemon.
    pokemon _random-kanto          -   Change the wallpaper to a random Pokemon from the specified region.

Search System Information:
    Any input containing 3 or more characters triggers the internal search system. Examples:
    "pokemon pika" changes the terminal background to Pikachu.
    "pokemon dos"  changes the terminal background to Gyarados.
''')


def slideshow(db, start, end, seconds="0.25"):
    # Show each Pokemon in order, one by one.
    try:
        for x in range(start, end):
            pokemon = db.get_pokemon(x)
            scripter.change_terminal(pokemon)
            time.sleep(float(seconds))
    except KeyboardInterrupt:
        print("Program was terminated.")
        sys.exit()


def change_terminal_background(db, arg):
    # Change the terminal background to the specified Pokemon, if it exists.
    if arg in db:
        pokemon = db.get_pokemon(arg)
        scripter.change_terminal(pokemon)
    else:  # If not found in the database, try to give suggestions.
        suggestions = db.names_with_infix(arg)
        if len(suggestions) == 0:
            print("No such Pokemon was found and no suggestions are available.")
        elif len(suggestions) == 1:
            scripter.change_terminal(suggestions[0])
            print("Did you mean " + suggestions[0].get_name().capitalize() + "?")
            scripter.change_terminal(suggestions[0])
        else:
            print("Did you mean " + suggestions[0].get_name().capitalize() + "?")
            print("Other suggestions:")
            print_columns(suggestions[1:])
            scripter.change_terminal(suggestions[0])


def change_wallpaper(db, arg):
    # Change the wallpaper to the specified Pokemon, if it exists.
    if arg in db:
        pokemon = db.get_pokemon(arg)
        scripter.change_wallpaper(pokemon)
    else:  # If not found in the database, try to give suggestions.
        suggestions = db.names_with_infix(arg)
        if len(suggestions) == 0:
            print("No such Pokemon was found and no suggestions are available.")
        elif len(suggestions) == 1:
            scripter.change_wallpaper(suggestions[0])
            print("Did you mean " + suggestions[0].get_name().capitalize() + "?")
            scripter.change_wallpaper(suggestions[0])
        else:
            print("Result: " + arg)
            print("Did you mean " + suggestions[0].get_name().capitalize() + "?")
            print("Other suggestions:")
            print_columns(suggestions[1:])
            scripter.change_wallpaper(suggestions[0])


def multiple_argument_handler(arg, time):
    db = Database()

    if arg.startswith("slideshow"):
        try:
            float(time)
            if arg == "slideshow":
                slideshow(db, 1, 494, time)
            elif arg == "slideshow-kanto":
                slideshow(db, 1, 152, time)
            elif arg == "slideshow-johto":
                slideshow(db, 152, 252, time)
            elif arg == "slideshow-hoenn":
                slideshow(db, 252, 387, time)
            elif arg == "slideshow-sinnoh":
                slideshow(db, 387, 494, time)
            else:
                print('Invalid slideshow command specified.'
                      '\nType "help" to see all the commands.')
        except ValueError:
            print('The slideshow time needs to be a positive number'
                  '\nType "help" to see all the commands.')
    else:
        print('Invalid command specified.'
              '\nType "help" to see all the commands.')


def single_argument_handler(arg):
    # Handle the logic for when there is only one command line parameter inputted.
    db = Database()

    # If there is an escape code, then change the wallpaper, not the terminal.
    if str(arg).startswith("_"):
        escape_code = True
        arg = arg[1:]
    else:
        escape_code = False

    if len(arg) < 3 and arg.isalpha():
        prefix_search(db, arg)
    elif arg == "extra":
        print_extra(db)
    elif arg == "regions":
        print_list(db.get_regions())
    elif arg == "help" or arg.startswith("-h"):
        print_usage()
    elif arg == "kanto":
        print_columns(db.get_kanto())
    elif arg == "johto":
        print_columns(db.get_johto())
    elif arg == "hoenn":
        print_columns(db.get_hoenn())
    elif arg == "sinnoh":
        print_columns(db.get_sinnoh())
    elif arg == "all":
        print_columns(db.get_all())
    elif arg == "clear" or arg == "disable" or arg == "off":
        scripter.clear_terminal()
    elif arg == "random" and escape_code:
        change_wallpaper(db, db.get_random().get_name())
    elif arg == "random-kanto" and escape_code:
        change_wallpaper(db, db.get_random_from_region("kanto").get_name())
    elif arg == "random-johto" and escape_code:
        change_wallpaper(db, db.get_random_from_region("johto").get_name())
    elif arg == "random-hoenn" and escape_code:
        change_wallpaper(db, db.get_random_from_region("hoenn").get_name())
    elif arg == "random-sinnoh" and escape_code:
        change_wallpaper(db, db.get_random_from_region("sinnoh").get_name())
    elif arg == "random":
        change_terminal_background(db, db.get_random().get_name())
    elif arg == "random-kanto":
        change_terminal_background(db, db.get_random_from_region("kanto").get_name())
    elif arg == "random-johto":
        change_terminal_background(db, db.get_random_from_region("johto").get_name())
    elif arg == "random-hoenn":
        change_terminal_background(db, db.get_random_from_region("hoenn").get_name())
    elif arg == "random-sinnoh":
        change_terminal_background(db, db.get_random_from_region("sinnoh").get_name())
    elif arg == "slideshow":
        slideshow(db, 1, 494)
    elif arg == "slideshow-kanto":
        slideshow(db, 1, 152)
    elif arg == "slideshow-johto":
        slideshow(db, 152, 252)
    elif arg == "slideshow-hoenn":
        slideshow(db, 252, 387)
    elif arg == "slideshow-sinnoh":
        slideshow(db, 387, 494)
    elif arg == "?":
        print("This function is deprecated.")
    elif escape_code:
        change_wallpaper(db, arg)
    else:
        change_terminal_background(db, arg)


if __name__ == "__main__":
    # Entrance to the program.
    if len(argv) == 1:
        print('No command line arguments specified.'
              '\nTry typing in a Pokemon name or number.'
              '\nOr type "help" to see all the commands.')
    elif len(argv) == 2:
        single_argument_handler(argv[1].lower())
    elif len(argv) == 3:
        multiple_argument_handler(argv[1].lower(), argv[2])
    else:
        print('Invalid number of arguments.'
              '\nType "help" to see all the commands.')