menu_screen.py

import curses
import math
import os
import traceback
import threading
import time
import random
import getpass
import json
import sqlite3
import string
import re
import completer
import datetime

class CursedMenu(object):
    #TODO: name your plant
    '''A class which abstracts the horrors of building a curses-based menu system'''
    def __init__(self, this_plant, this_data):
        '''Initialization'''
        self.initialized = False
        self.screen = curses.initscr()
        curses.noecho()
        curses.raw()
        if curses.has_colors():
            curses.start_color()
        try:
            curses.curs_set(0)
        except curses.error:
            # Not all terminals support this functionality.
            # When the error is ignored the screen will look a little uglier, but that's not terrible
            # So in order to keep botany as accesible as possible to everyone, it should be safe to ignore the error.
            pass
        self.screen.keypad(1)
        self.plant = this_plant
        self.visited_plant = None
        self.user_data = this_data
        self.plant_string = self.plant.parse_plant()
        self.plant_ticks = str(int(self.plant.ticks))
        self.exit = False
        self.infotoggle = 0
        self.maxy, self.maxx = self.screen.getmaxyx()
        # Highlighted and Normal line definitions
        if curses.has_colors():
            self.define_colors()
            self.highlighted = curses.color_pair(1)
        else:
            self.highlighted = curses.A_REVERSE
        self.normal = curses.A_NORMAL
        # Threaded screen update for live changes
        screen_thread = threading.Thread(target=self.update_plant_live, args=())
        screen_thread.daemon = True
        screen_thread.start()
        # Recusive lock to prevent both threads from drawing at the same time
        self.screen_lock = threading.RLock()
        self.screen.clear()
        self.show(["water","look","garden","visit", "instructions"], title=' botany ', subtitle='options')

    def define_colors(self):
        # TODO: implement colors
        # set curses color pairs manually
        curses.init_pair(1, curses.COLOR_BLACK, curses.COLOR_WHITE)
        curses.init_pair(2, curses.COLOR_WHITE, curses.COLOR_BLACK)
        curses.init_pair(3, curses.COLOR_GREEN, curses.COLOR_BLACK)
        curses.init_pair(4, curses.COLOR_BLUE, curses.COLOR_BLACK)
        curses.init_pair(5, curses.COLOR_MAGENTA, curses.COLOR_BLACK)
        curses.init_pair(6, curses.COLOR_YELLOW, curses.COLOR_BLACK)
        curses.init_pair(7, curses.COLOR_RED, curses.COLOR_BLACK)
        curses.init_pair(8, curses.COLOR_CYAN, curses.COLOR_BLACK)

    def show(self, options, title, subtitle):
        # Draws a menu with parameters
        self.set_options(options)
        self.update_options()
        self.title = title
        self.subtitle = subtitle
        self.selected = 0
        self.initialized = True
        self.draw_menu()

    def update_options(self):
        # Makes sure you can get a new plant if it dies
        if self.plant.dead or self.plant.stage == 5:
            if "harvest" not in self.options:
                self.options.insert(-1,"harvest")
        else:
            if "harvest" in self.options:
                self.options.remove("harvest")

    def set_options(self, options):
        # Validates that the last option is "exit"
        if options[-1] != 'exit':
            options.append('exit')
        self.options = options

    def draw(self):
        # Draw the menu and lines
        self.maxy, self.maxx = self.screen.getmaxyx()
        self.screen_lock.acquire()
        self.screen.refresh()
        try:
            self.draw_default()
            self.screen.refresh()
        except Exception as exception:
            # Makes sure data is saved in event of a crash due to window resizing
            self.screen.clear()
            self.screen.addstr(0, 0, "Enlarge terminal!", curses.A_NORMAL)
            self.screen.refresh()
            self.__exit__()
            traceback.print_exc()
        self.screen_lock.release()

    def draw_menu(self):
        # Actually draws the menu and handles branching
        request = ""
        try:
            while request != "exit":
                self.draw()
                request = self.get_user_input()
                self.handle_request(request)
            self.__exit__()

        # Also calls __exit__, but adds traceback after
        except Exception as exception:
            self.screen.clear()
            self.screen.addstr(0, 0, "Enlarge terminal!", curses.A_NORMAL)
            self.screen.refresh()
            self.__exit__()
            #traceback.print_exc()
        except IOError as exception:
            self.screen.clear()
            self.screen.refresh()
            self.__exit__()

    def ascii_render(self, filename, ypos, xpos):
        # Prints ASCII art from file at given coordinates
        this_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)),"art")
        this_filename = os.path.join(this_dir,filename)
        this_file = open(this_filename,"r")
        this_string = this_file.readlines()
        this_file.close()
        self.screen_lock.acquire()
        for y, line in enumerate(this_string, 2):
            self.screen.addstr(ypos+y, xpos, line, curses.A_NORMAL)
        # self.screen.refresh()
        self.screen_lock.release()

    def draw_plant_ascii(self, this_plant):
        ypos = 0
        xpos = int((self.maxx-37)/2 + 25)
        plant_art_list = [
            'poppy',
            'cactus',
            'aloe',
            'flytrap',
            'jadeplant',
            'fern',
            'daffodil',
            'sunflower',
            'baobab',
            'lithops',
            'hemp',
            'pansy',
            'iris',
            'agave',
            'ficus',
            'moss',
            'sage',
            'snapdragon',
            'columbine',
            'brugmansia',
            'palm',
            'pachypodium',
        ]
        if this_plant.dead == True:
            self.ascii_render('rip.txt', ypos, xpos)
        elif datetime.date.today().month == 10 and datetime.date.today().day == 31:
            self.ascii_render('jackolantern.txt', ypos, xpos)
        elif this_plant.stage == 0:
            self.ascii_render('seed.txt', ypos, xpos)
        elif this_plant.stage == 1:
            self.ascii_render('seedling.txt', ypos, xpos)
        elif this_plant.stage == 2:
            this_filename = plant_art_list[this_plant.species]+'1.txt'
            self.ascii_render(this_filename, ypos, xpos)
        elif this_plant.stage == 3 or this_plant.stage == 5:
            this_filename = plant_art_list[this_plant.species]+'2.txt'
            self.ascii_render(this_filename, ypos, xpos)
        elif this_plant.stage == 4:
            this_filename = plant_art_list[this_plant.species]+'3.txt'
            self.ascii_render(this_filename, ypos, xpos)

    def draw_default(self):
        # draws default menu
        clear_bar = " " * (int(self.maxx*2/3))
        self.screen_lock.acquire()
        self.screen.addstr(1, 2, self.title, curses.A_STANDOUT) # Title for this menu
        self.screen.addstr(3, 2, self.subtitle, curses.A_BOLD) #Subtitle for this menu
        # clear menu on screen
        for index in range(len(self.options)+1):
            self.screen.addstr(4+index, 4, clear_bar, curses.A_NORMAL)
        # display all the menu items, showing the 'pos' item highlighted
        for index in range(len(self.options)):
            textstyle = self.normal
            if index == self.selected:
                textstyle = self.highlighted
            self.screen.addstr(4+index ,4, clear_bar, curses.A_NORMAL)
            self.screen.addstr(4+index ,4, "%d - %s" % (index+1, self.options[index]), textstyle)

        self.screen.addstr(12, 2, clear_bar, curses.A_NORMAL)
        self.screen.addstr(13, 2, clear_bar, curses.A_NORMAL)
        self.screen.addstr(12, 2, "plant: ", curses.A_DIM)
        self.screen.addstr(12, 9, self.plant_string, curses.A_NORMAL)
        self.screen.addstr(13, 2, "score: ", curses.A_DIM)
        self.screen.addstr(13, 9, self.plant_ticks, curses.A_NORMAL)

        # display fancy water gauge
        if not self.plant.dead:
            water_gauge_str = self.water_gauge()
            self.screen.addstr(4,14, water_gauge_str, curses.A_NORMAL)
        else:
            self.screen.addstr(4,13, clear_bar, curses.A_NORMAL)
            self.screen.addstr(4,14, "(   RIP   )", curses.A_NORMAL)

        # draw cute ascii from files
        if self.visited_plant:
            # Needed to prevent drawing over a visited plant
            self.draw_plant_ascii(self.visited_plant)
        else:
            self.draw_plant_ascii(self.plant)
        self.screen_lock.release()

    def water_gauge(self):
        # build nice looking water gauge
        water_left_pct = 1 - ((time.time() - self.plant.watered_timestamp)/86400)
        # don't allow negative value
        water_left_pct = max(0, water_left_pct)
        water_left = int(math.ceil(water_left_pct * 10))
        water_string = "(" + (")" * water_left) + ("." * (10 - water_left)) + ") " + str(int(water_left_pct * 100)) + "% "
        return water_string

    def update_plant_live(self):
        # updates plant data on menu screen, live!
        while not self.exit:
            self.plant_string = self.plant.parse_plant()
            self.plant_ticks = str(int(self.plant.ticks))
            if self.initialized:
                self.update_options()
                self.draw()
            time.sleep(1)

    def get_user_input(self):
        # gets the user's input
        try:
            user_in = self.screen.getch() # Gets user input
        except Exception as e:
            self.__exit__()
        if user_in == -1: # Input comes from pipe/file and is closed
            raise IOError
        ## DEBUG KEYS - enable these lines to see curses key codes
        # self.screen.addstr(2, 2, str(user_in), curses.A_NORMAL)
        # self.screen.refresh()

        # Resize sends curses.KEY_RESIZE, update display
        if user_in == curses.KEY_RESIZE:
            self.maxy,self.maxx = self.screen.getmaxyx()
            self.screen.clear()
            self.screen.refresh()

        # enter, exit, and Q Keys are special cases
        if user_in == 10:
            return self.options[self.selected]
        if user_in == 27:
            return self.options[-1]
        if user_in == 113:
            self.selected = len(self.options) - 1
            return

        # this is a number; check to see if we can set it
        if user_in >= ord('1') and user_in <= ord(str(min(7,len(self.options)))):
            self.selected = user_in - ord('0') - 1 # convert keypress back to a number, then subtract 1 to get index
            return

        # increment or Decrement
        down_keys = [curses.KEY_DOWN, 14, ord('j')]
        up_keys = [curses.KEY_UP, 16, ord('k')]

        if user_in in down_keys: # down arrow
            self.selected += 1
        if user_in in up_keys: # up arrow
            self.selected -=1

        # modulo to wrap menu cursor
        self.selected = self.selected % len(self.options)
        return

    def format_garden_data(self,this_garden):
        # Returns list of lists (pages) of garden entries
        plant_table = []
        for plant_id in this_garden:
            if this_garden[plant_id]:
                if not this_garden[plant_id]["dead"]:
                    this_plant = this_garden[plant_id]
                    plant_table.append((this_plant["owner"],
                                        this_plant["age"],
                                        int(this_plant["score"]),
                                        this_plant["description"]))
        return plant_table

    def format_garden_entry(self, entry):
        return "{:14.14} - {:>16} - {:>8}p - {}".format(*entry)

    def sort_garden_table(self, table, column, ascending):
        """ Sort table in place by a specified column """
        def key(entry):
            entry = entry[column]
            # In when sorting ages, convert to seconds
            if column == 1:
                coeffs = [24*60*60, 60*60, 60, 1]
                nums = [int(n[:-1]) for n in entry.split(":")]
                if len(nums) == len(coeffs):
                    entry = sum(nums[i] * coeffs[i] for i in range(len(nums)))
            return entry

        return table.sort(key=key, reverse=not ascending)

    def filter_garden_table(self, table, pattern):
        """ Filter table using a pattern, and return the new table """
        def filterfunc(entry):
            if len(pattern) == 0:
                return True
            entry_txt = self.format_garden_entry(entry)
            try:
                result = bool(re.search(pattern, entry_txt))
            except Exception as e:
                # In case of invalid regex, don't match anything
                result = False
            return result
        return list(filter(filterfunc, table))

    def draw_garden(self):
        # draws community garden
        # load data from sqlite db
        this_garden = self.user_data.retrieve_garden_from_db()
        # format data
        self.clear_info_pane()

        if self.infotoggle == 2:
            # the screen IS currently showing the garden (1 page), make the
            # text a bunch of blanks to clear it out
            self.infotoggle = 0
            return

        # if infotoggle isn't 2, the screen currently displays other stuff
        plant_table_orig = self.format_garden_data(this_garden)
        self.infotoggle = 2

        # print garden information OR clear it
        index = 0
        sort_column, sort_ascending = 0, True
        sort_keys = ["n", "a", "s", "d"] # Name, Age, Score, Description
        plant_table = plant_table_orig
        self.sort_garden_table(plant_table, sort_column, sort_ascending)
        while True:
            entries_per_page = self.maxy - 16
            index_max = min(len(plant_table), index + entries_per_page)
            plants = plant_table[index:index_max]
            page = [self.format_garden_entry(entry) for entry in plants]
            self.screen_lock.acquire()
            self.draw_info_text(page)
            # Multiple pages, paginate and require keypress
            page_text = "(%d-%d/%d) | sp/next | bksp/prev | s <col #>/sort | f/filter | q/quit" % (index, index_max, len(plant_table))
            self.screen.addstr(self.maxy-2, 2, page_text)
            self.screen.refresh()
            self.screen_lock.release()
            c = self.screen.getch()
            if c == -1: # Input comes from pipe/file and is closed
                raise IOError
            self.infotoggle = 0

            # Quit
            if c == ord("q") or c == ord("x") or c == 27:
                break
            # Next page
            elif c in [curses.KEY_ENTER, curses.KEY_NPAGE, ord(" "), ord("\n")]:
                index += entries_per_page
                if index >= len(plant_table):
                    break
            # Previous page
            elif c == curses.KEY_BACKSPACE or c == curses.KEY_PPAGE:
                index = max(index - entries_per_page, 0)
            # Next line
            elif c == ord("j") or c == curses.KEY_DOWN:
                index = max(min(index + 1, len(plant_table) - 1), 0)
            # Previous line
            elif c == ord("k") or c == curses.KEY_UP:
                index = max(index - 1, 0)
            # Sort entries
            elif c == ord("s"):
                c = self.screen.getch()
                if c == -1: # Input comes from pipe/file and is closed
                    raise IOError
                column = -1
                if c < 255 and chr(c) in sort_keys:
                    column = sort_keys.index(chr(c))
                elif ord("1") <= c <= ord("4"):
                    column = c - ord("1")
                if column != -1:
                    if sort_column == column:
                        sort_ascending = not sort_ascending
                    else:
                        sort_column = column
                        sort_ascending = True
                    self.sort_garden_table(plant_table, sort_column, sort_ascending)
            # Filter entries
            elif c == ord("/") or c == ord("f"):
                self.screen.addstr(self.maxy-2, 2, "Filter: " + " " * (len(page_text)-8))
                pattern = self.get_user_string(10, self.maxy-2, lambda x: x in string.printable)
                plant_table = self.filter_garden_table(plant_table_orig, pattern)
                self.sort_garden_table(plant_table, sort_column, sort_ascending)
                index = 0

            # Clear page before drawing next
            self.clear_info_pane()
        self.clear_info_pane()

    def get_plant_description(self, this_plant):
        output_text = ""
        this_species = this_plant.species_list[this_plant.species]
        this_color = this_plant.color_list[this_plant.color]
        this_stage = this_plant.stage

        stage_descriptions = {
                0:[
            "You're excited about your new seed.",
            "You wonder what kind of plant your seed will grow into.",
            "You're ready for a new start with this plant.",
            "You're tired of waiting for your seed to grow.",
            "You wish your seed could tell you what it needs.",
            "You can feel the spirit inside your seed.",
            "These pretzels are making you thirsty.",
            "Way to plant, Ann!",
            "'To see things in the seed, that is genius' - Lao Tzu",
            ],
                1:[
            "The seedling fills you with hope.",
            "The seedling shakes in the wind.",
            "You can make out a tiny leaf - or is that a thorn?",
            "You can feel the seedling looking back at you.",
            "You blow a kiss to your seedling.",
            "You think about all the seedlings who came before it.",
            "You and your seedling make a great team.",
            "Your seedling grows slowly and quietly.",
            "You meditate on the paths your plant's life could take.",
            ],
                2:[
            "The " + this_species + " makes you feel relaxed.",
            "You sing a song to your " + this_species + ".",
            "You quietly sit with your " + this_species + " for a few minutes.",
            "Your " + this_species + " looks pretty good.",
            "You play loud techno to your " + this_species + ".",
            "You play piano to your " + this_species + ".",
            "You play rap music to your " + this_species + ".",
            "You whistle a tune to your " + this_species + ".",
            "You read a poem to your " + this_species + ".",
            "You tell a secret to your " + this_species + ".",
            "You play your favorite record for your " + this_species + ".",
            ],
                3:[
            "Your " + this_species + " is growing nicely!",
            "You're proud of the dedication it took to grow your " + this_species + ".",
            "You take a deep breath with your " + this_species + ".",
            "You think of all the words that rhyme with " + this_species + ".",
            "The " + this_species + " looks full of life.",
            "The " + this_species + " inspires you.",
            "Your " + this_species + " makes you forget about your problems.",
            "Your " + this_species + " gives you a reason to keep going.",
            "Looking at your " + this_species + " helps you focus on what matters.",
            "You think about how nice this " + this_species + " looks here.",
            "The buds of your " + this_species + " might bloom soon.",
            ],
                4:[
            "The " + this_color + " flowers look nice on your " + this_species +"!",
            "The " + this_color + " flowers have bloomed and fill you with positivity.",
            "The " + this_color + " flowers remind you of your childhood.",
            "The " + this_color + " flowers remind you of spring mornings.",
            "The " + this_color + " flowers remind you of a forgotten memory.",
            "The " + this_color + " flowers remind you of your happy place.",
            "The aroma of the " + this_color + " flowers energize you.",
            "The " + this_species + " has grown beautiful " + this_color + " flowers.",
            "The " + this_color + " petals remind you of that favorite shirt you lost.",
            "The " + this_color + " flowers remind you of your crush.",
            "You smell the " + this_color + " flowers and are filled with peace.",
            ],
                5:[
            "You fondly remember the time you spent caring for your " + this_species + ".",
            "Seed pods have grown on your " + this_species + ".",
            "You feel like your " + this_species + " appreciates your care.",
            "The " + this_species + " fills you with love.",
            "You're ready for whatever comes after your " + this_species + ".",
            "You're excited to start growing your next plant.",
            "You reflect on when your " + this_species + " was just a seedling.",
            "You grow nostalgic about the early days with your " + this_species + ".",
            ],
                99:[
            "You wish you had taken better care of your plant.",
            "If only you had watered your plant more often..",
            "Your plant is dead, there's always next time.",
            "You cry over the withered leaves of your plant.",
            "Your plant died. Maybe you need a fresh start.",
            ],
        }
        # self.life_stages is tuple containing length of each stage
        # (seed, seedling, young, mature, flowering)
        if this_plant.dead:
            this_stage = 99

        this_stage_descriptions = stage_descriptions[this_stage]
        description_num = random.randint(0,len(this_stage_descriptions) - 1)
        # If not fully grown
        if this_stage <= 4:
            # Growth hint
            if this_stage >= 1:
                last_growth_at = this_plant.life_stages[this_stage - 1]
            else:
                last_growth_at = 0
            ticks_since_last = this_plant.ticks - last_growth_at
            ticks_between_stage = this_plant.life_stages[this_stage] - last_growth_at
            if ticks_since_last >= ticks_between_stage * 0.8:
                output_text += "You notice your plant looks different.\n"

        output_text += this_stage_descriptions[description_num] + "\n"

        # if seedling
        if this_stage == 1:
            species_options = [this_plant.species_list[this_plant.species],
                    this_plant.species_list[(this_plant.species+3) % len(this_plant.species_list)],
                    this_plant.species_list[(this_plant.species-3) % len(this_plant.species_list)]]
            random.shuffle(species_options)
            plant_hint = "It could be a(n) " + species_options[0] + ", " + species_options[1] + ", or " + species_options[2]
            output_text += plant_hint + ".\n"

        # if young plant
        if this_stage == 2:
            if this_plant.rarity >= 2:
                rarity_hint = "You feel like your plant is special."
                output_text += rarity_hint + ".\n"

        # if mature plant
        if this_stage == 3:
            color_options = [this_plant.color_list[this_plant.color],
                    this_plant.color_list[(this_plant.color+3) % len(this_plant.color_list)],
                    this_plant.color_list[(this_plant.color-3) % len(this_plant.color_list)]]
            random.shuffle(color_options)
            plant_hint = "You can see the first hints of " + color_options[0] + ", " + color_options[1] + ", or " + color_options[2]
            output_text += plant_hint + ".\n"

        return output_text

    def draw_plant_description(self, this_plant):
        # If menu is currently showing something other than the description
        self.clear_info_pane()
        if self.infotoggle != 1:
            # get plant description before printing
            output_string = self.get_plant_description(this_plant)
            growth_multiplier = 1 + (0.2 * (this_plant.generation-1))
            output_string += "Generation: {}\nGrowth rate: {}x".format(self.plant.generation, growth_multiplier)
            self.draw_info_text(output_string)
            self.infotoggle = 1
        else:
            # otherwise just set toggle
            self.infotoggle = 0

    def draw_instructions(self):
        # Draw instructions on screen
        self.clear_info_pane()
        if self.infotoggle != 4:
            instructions_txt = ("welcome to botany. you've been given a seed\n"
                                "that will grow into a beautiful plant. check\n"
                                "in and water your plant every 24h to keep it\n"
                                "growing. 5 days without water = death. your\n"
                                "plant depends on you & your friends to live!\n"
                                "more info is available in the readme :)\n"
                                "https://github.com/jifunks/botany/blob/master/README.md\n"
                                "                               cheers,\n"
                                "                               curio\n"
                                )
            self.draw_info_text(instructions_txt)
            self.infotoggle = 4
        else:
            self.infotoggle = 0

    def clear_info_pane(self):
        # Clears bottom part of screen
        self.screen_lock.acquire()
        clear_bar = " " * (self.maxx - 3)
        this_y = 14
        while this_y < self.maxy:
            self.screen.addstr(this_y, 2, clear_bar, curses.A_NORMAL)
            this_y += 1
        self.screen.refresh()
        self.screen_lock.release()

    def draw_info_text(self, info_text, y_offset = 0):
        # print lines of text to info pane at bottom of screen
        self.screen_lock.acquire()
        if type(info_text) is str:
            info_text = info_text.splitlines()
        for y, line in enumerate(info_text, 2):
            this_y = y+12 + y_offset
            if len(line) > self.maxx - 3:
                line = line[:self.maxx-3]
            if this_y < self.maxy:
                self.screen.addstr(this_y, 2, line, curses.A_NORMAL)
        self.screen.refresh()
        self.screen_lock.release()

    def harvest_confirmation(self):
        self.clear_info_pane()
        # get plant description before printing
        max_stage = len(self.plant.stage_list) - 1
        harvest_text = ""
        if not self.plant.dead:
            if self.plant.stage == max_stage:
                harvest_text += "Congratulations! You raised your plant to its final stage of growth.\n"
                harvest_text += "Your next plant will grow at a speed of: {}x\n".format(1 + (0.2 * self.plant.generation))
        harvest_text += "If you harvest your plant you'll start over from a seed.\nContinue? (Y/n)"
        self.draw_info_text(harvest_text)
        try:
            user_in = self.screen.getch() # Gets user input
        except Exception as e:
            self.__exit__()
        if user_in == -1: # Input comes from pipe/file and is closed
            raise IOError

        if user_in in [ord('Y'), ord('y')]:
            self.plant.start_over()
        else:
            pass
        self.clear_info_pane()

    def build_weekly_visitor_output(self, visitors):
        visitor_block = ""
        visitor_line = ""
        for visitor in visitors:
            this_visitor_string = str(visitor) + "({}) ".format(visitors[str(visitor)])
            if len(visitor_line + this_visitor_string) > self.maxx-3:
                visitor_block += '\n'
                visitor_line = ""
            visitor_block += this_visitor_string
            visitor_line += this_visitor_string
        return visitor_block

    def build_latest_visitor_output(self, visitors):
        visitor_line = ""
        for visitor in visitors:
            if len(visitor_line + visitor) > self.maxx-10:
                visitor_line += "and more"
                break
            visitor_line += visitor + ' '
        return [visitor_line]

    def get_weekly_visitors(self):
        game_dir = os.path.dirname(os.path.realpath(__file__))
        garden_db_path = os.path.join(game_dir, 'sqlite/garden_db.sqlite')
        conn = sqlite3.connect(garden_db_path)
        c = conn.cursor()
        c.execute("SELECT * FROM visitors WHERE garden_name = '{}' ORDER BY weekly_visits".format(self.plant.owner))
        visitor_data = c.fetchall()
        conn.close()
        visitor_block = ""
        visitor_line = ""
        if visitor_data:
            for visitor in visitor_data:
                visitor_name = visitor[2]
                weekly_visits = visitor[3]
                this_visitor_string = "{}({}) ".format(visitor_name, weekly_visits)
                if len(visitor_line + this_visitor_string) > self.maxx-3:
                    visitor_block += '\n'
                    visitor_line = ""
                visitor_block += this_visitor_string
                visitor_line += this_visitor_string
        else:
            visitor_block = 'nobody :('
        return visitor_block

    def get_user_string(self, xpos=3, ypos=15, filterfunc=str.isalnum, completer=None):
        # filter allowed characters using filterfunc, alphanumeric by default
        user_string = ""
        user_input = 0
        if completer:
            completer = completer(self)
        while user_input != 10:
            user_input = self.screen.getch()
            if user_input == -1: # Input comes from pipe/file and is closed
                raise IOError
            self.screen_lock.acquire()
            # osx and unix backspace chars...
            if user_input == 127 or user_input == 263:
                if len(user_string) > 0:
                    user_string = user_string[:-1]
                    if completer:
                        completer.update_input(user_string)
                    self.screen.addstr(ypos, xpos, " " * (self.maxx-xpos-1))
            elif user_input in [ord('\t'), curses.KEY_BTAB] and completer:
                direction = 1 if user_input == ord('\t') else -1
                user_string = completer.complete(direction)
                self.screen.addstr(ypos, xpos, " " * (self.maxx-xpos-1))
            elif user_input < 256 and user_input != 10:
                if filterfunc(chr(user_input)) or chr(user_input) == '_':
                    user_string += chr(user_input)
                    if completer:
                        completer.update_input(user_string)
            self.screen.addstr(ypos, xpos, str(user_string))
            self.screen.refresh()
            self.screen_lock.release()
        return user_string

    def visit_handler(self):
        self.clear_info_pane()
        self.draw_info_text("whose plant would you like to visit?")
        self.screen.addstr(15, 2, '~')
        if self.plant.visitors:
            latest_visitor_string = self.build_latest_visitor_output(self.plant.visitors)
            self.draw_info_text("since last time, you were visited by: ", 3)
            self.draw_info_text(latest_visitor_string, 4)
            self.plant.visitors = []
        weekly_visitor_text = self.get_weekly_visitors()
        self.draw_info_text("this week you've been visited by: ", 6)
        self.draw_info_text(weekly_visitor_text, 7)
        guest_garden = self.get_user_string(completer = completer.LoginCompleter)
        if not guest_garden:
            self.clear_info_pane()
            return None
        if guest_garden.lower() == getpass.getuser().lower():
            self.screen.addstr(16, 2, "you're already here!")
            self.screen.getch()
            self.clear_info_pane()
            return None
        home_folder = os.path.dirname(os.path.expanduser("~"))
        guest_json = home_folder + "/{}/.botany/{}_plant_data.json".format(guest_garden, guest_garden)
        guest_plant_description = ""
        if os.path.isfile(guest_json):
            with open(guest_json) as f:
                visitor_data = json.load(f)
                guest_plant_description = visitor_data['description']
                self.visited_plant = self.get_visited_plant(visitor_data)
        guest_visitor_file = home_folder + "/{}/.botany/visitors.json".format(guest_garden, guest_garden)
        if os.path.isfile(guest_visitor_file):
            water_success = self.water_on_visit(guest_visitor_file)
            if water_success:
                self.screen.addstr(16, 2, "...you watered ~{}'s {}...".format(str(guest_garden), guest_plant_description))
                if self.visited_plant:
                    self.draw_plant_ascii(self.visited_plant)
            else:
                self.screen.addstr(16, 2, "{}'s garden is locked, but you can see in...".format(guest_garden))
        else:
            self.screen.addstr(16, 2, "i can't seem to find directions to {}...".format(guest_garden))
        try:
            self.screen.getch()
            self.clear_info_pane()
            self.draw_plant_ascii(self.plant)
        finally:
            self.visited_plant = None

    def water_on_visit(self, guest_visitor_file):
        visitor_data = {}
        # using -1 here so that old running instances can be watered
        guest_data = {'user': getpass.getuser(), 'timestamp': int(time.time()) - 1}
        if os.path.isfile(guest_visitor_file):
            if not os.access(guest_visitor_file, os.W_OK):
                return False
            with open(guest_visitor_file) as f:
                visitor_data = json.load(f)
            visitor_data.append(guest_data)
            with open(guest_visitor_file, mode='w') as f:
                f.write(json.dumps(visitor_data, indent=2))
            return True

    def get_visited_plant(self, visitor_data):
        """ Returns a drawable pseudo plant object from json data """
        class VisitedPlant: pass
        plant = VisitedPlant()
        plant.stage = 0
        plant.species = 0

        if "is_dead" not in visitor_data:
            return None
        plant.dead = visitor_data["is_dead"]
        if plant.dead:
            return plant

        if "stage" in visitor_data:
            stage = visitor_data["stage"]
            if stage in self.plant.stage_list:
                plant.stage = self.plant.stage_list.index(stage)

        if "species" in visitor_data:
            species = visitor_data["species"]
            if species in self.plant.species_list:
                plant.species = self.plant.species_list.index(species)
            else:
                return None
        elif plant.stage > 1:
            return None
        return plant

    def handle_request(self, request):
        # Menu options call functions here
        if request == None: return
        if request == "harvest":
            self.harvest_confirmation()
        if request == "water":
            self.plant.water()
        if request == "look":
            try:
                self.draw_plant_description(self.plant)
            except Exception as exception:
                self.screen.refresh()
                # traceback.print_exc()
        if request == "instructions":
            try:
                self.draw_instructions()
            except Exception as exception:
                self.screen.refresh()
                # traceback.print_exc()
        if request == "visit":
            try:
                self.visit_handler()
            except Exception as exception:
                self.screen.refresh()
                # traceback.print_exc()
        if request == "garden":
            try:
                self.draw_garden()
            except Exception as exception:
                self.screen.refresh()
                # traceback.print_exc()

    def __exit__(self):
        self.exit = True
        cleanup()

def cleanup():
    try:
        curses.curs_set(2)
    except curses.error:
        # cursor not supported; just ignore
        pass
    curses.endwin()
    os.system('clear')