#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This file is part of ROBOTGAME
#
# ROBOTGAME is free software: you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# ROBOTGAME is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# ROBOTGAME.  If not, see <http://www.gnu.org/licenses/>.
#
# ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' '
#
#                         lasermirror.py
#                     --------------------
#       date created : Tue Aug 7 2012
#          copyright : (C) 2012 Niels G. W. Serup
#      maintained by : Niels G. W. Serup <ns@metanohi.name>

"""
Management of lasers in rooms of mirrors and targets.
"""

from __future__ import print_function
import math
import random
import itertools
from robotgame.logic.direction import *
import robotgame.logic.rollingstone as rstone
import robotgame.misc as misc

class Mirror(object):
    pass

class Lever(object):
    pass

class Target(object):
    pass

def generate_simple_playfield(nmirrors):
    """
    Generate a completable 12x12 playfield where:
      * there are four laser sources, one in each corner
        + the one in the upper left corner (0, 0) starts in (0, -1) heading down
        + the one in the upper right corner (11, 0) starts in (12, 0), heading left
        + the one in the lower right corner (11, 11) starts in (11, 12), heading up
        + the one in the lower left corner (0, 11) starts in (-1, 11), heading right
      * there are four laser targets
      * there are nmirrors mirrors
      * there are nmirrors levers
      * all levers are at the wall

    Return playfield : {(x, y): Target | Mirror | rstone.Blocker | Lever}
    """
    playfield = {(4, 4): Target,
                 (7, 4): Target,
                 (4, 7): Target,
                 (7, 7): Target,
                 (5, 5): rstone.Blocker,
                 (5, 6): rstone.Blocker,
                 (6, 5): rstone.Blocker,
                 (6, 6): rstone.Blocker,
                 }
    succs = lambda d: d
    source_direc = Up
    nlevers = nmirrors
    for missing in range(4, 0, -1):
        nm = nmirrors / missing
        nmirrors -= nm
        stone_playfield, _ = rstone.generate_simple_playfield(
            5, 5, nm, 0, False, False)
        for pos, direc in stone_playfield.items():
            if direc is not None and pos >= (0, 0):
                playfield[_adjust(source_direc, 12 - 1, 12 - 1, *pos)] = Mirror
        succs = (lambda s: lambda d: succ(s(d)))(succs)
        source_direc = succ(source_direc)

    occup = set(playfield.keys())
    emptys = list(
        set([(0, y) for y in filter(lambda y: (1, y) not in occup, range(12))]
            + [(11, y) for y in filter(lambda y: (10, y) not in occup, range(12))]
            + [(x, 0) for x in filter(lambda x: (x, 1) not in occup, range(12))]
            + [(x, 11) for x in filter(lambda x: (x, 10) not in occup, range(12))])
        - occup)
    if len(emptys) < nlevers:
        raise Exception("Not enough space for all levers!")        
    for pos in misc.pick_random_elements(emptys, nlevers):
        playfield[pos] = Lever
    return playfield

def _adjust(source_direc, w, h, x, y):
    return {
        Up:    lambda x, y: (x, y),
        Right: lambda x, y: (w - y, x),
        Down:  lambda x, y: (w - x, h - y),
        Left:  lambda x, y: (y, h - x),
        }[source_direc](x, y)
    
def print_playfield(playfield, width, height, hide_directions=False):
    text = [['·' for _ in range(width)] for _ in range(height)]
    for (x, y), val in playfield.items():
        if isDirection(val) and hide_directions:
            continue
        text[y][x] = '%' if val is rstone.Blocker \
            else 'x' if val is Mirror \
            else 'L' if val is Lever \
            else 'T' if val is Target else 'N'
    print('\n'.join(''.join(line) for line in text))