#!/usr/bin/env ruby
# frozen_string_literal: true

require 'curses'
require 'optparse'

require 'minehunt'

def display_curses( field,
                    state = { dead: false, victory: false },
                    theme = { explorer: '()',
                              dead_explorer: '☠ ',
                              door: '=>',
                              mine: '<>',
                              cell: '██',
                              visited_cell: '  ' } )
  Curses.setpos 0, 0

  if state[:dead]
    Curses.addstr "You blew up!!, score: #{field.score}                             "
  elsif state[:victory]
    Curses.addstr "You won!! :), score: #{field.score}                             "
  else
    Curses.addstr "Near #{field.count_nearby_mines} mines, score: #{field.score}"
  end

  field.height.times do |y|
    Curses.setpos y + 2, 0
    field.width.times do |x|
      if [field.explorer_x, field.explorer_y] == [x, y]
        Curses.addstr state[:dead] ? theme[:dead_explorer] : theme[:explorer]
      elsif [field.width, field.height] == [x + 1, y + 1]
        Curses.addstr theme[:door]
      elsif field.field[[x, y]].open
        Curses.addstr theme[:visited_cell]
      elsif field.field[[x, y]].mine && ( state[:dead] || state[:victory] )
        Curses.addstr theme[:mine]
      else
        Curses.addstr theme[:cell]
      end
    end
  end

  Curses.refresh
end

def ncurses_main( number_of_mines )
  field = MineHunt::Board.new( number_of_mines )
  finished = false

  Curses.init_screen
  Curses.cbreak
  Curses.noecho
  Curses.stdscr.keypad = true

  at_exit do
    Curses.close_screen
  end

  display_curses( field )

  loop do
    direction = ''
    ch = Curses.getch
    if finished
      begin
        case ch
        when 'r'
          field = MineHunt::Board.new( number_of_mines )
          finished = false
        else
          break
        end
      rescue Curses::RequestDeniedError
        'prout'
      end
    else
      begin
        case ch
        when '1'
          direction = 'down-left'
        when '2', Curses::KEY_DOWN
          direction = 'down'
        when '3'
          direction = 'down-right'
        when '4', Curses::KEY_LEFT
          direction = 'left'
        when '6', Curses::KEY_RIGHT
          direction = 'right'
        when '7'
          direction = 'up-left'
        when '8', Curses::KEY_UP
          direction = 'up'
        when '9'
          direction = 'up-right'
        when 'q'
          break
        end
      rescue Curses::RequestDeniedError
        'prout'
      end
    end

    state = field.move( direction )
    finished = state[:dead] || state[:victory]
    display_curses( field, state )
  end

  exit!
end

options = { number_of_mines: 20 }
OptionParser.new do |opts|
  opts.banner = 'Usage: minehunt <options>'

  opts.on( '-m', '--mines INT' ) do |nb_mines|
    options[:number_of_mines] = nb_mines.to_i
  end
end
            .parse!

ncurses_main( options[:number_of_mines] )