module Fm
	DONT_PREVIEW_THESE_FILES = /\.(avi|[mj]pe?g|iso|mp\d|og[gmv]|wm[av]|mkv|torrent|so|class|flv|png|bmp|vob|divx?)$/i

	def self.column_put_file(n, file)
		i = 0
		if OPTIONS['filepreview'] and file.path !~ DONT_PREVIEW_THESE_FILES
			m = lines - 2
			color 7
			bold false
			left, wid = get_boundaries(n)
			if file.ext =~ /(?:rar|zip|7z|tar|gz)$/ and file.size < 10485760
				text = `aunpack -l #{file.sh} 2>> /dev/null`
				text.each_line do |l|
					puti i+1, left, l[0, wid-1].ljust(wid)
					i += 1
					break if i == m
				end
			else
				File.open(file.path, 'r') do |f|
					check = true
					left, wid = get_boundaries(n)
					f.lines.each do |l|
						if check
							check = false
							break unless l.each_char.all? {|x| x[0] > 0 and x[0] < 128}
						end
						puti i+1, left, l.gsub("\t","   ")[0, wid-1].ljust(wid)
						i += 1
						break if i == m
					end
				end
			end
		end
		column_clear(n, i)
	end

	def self.put_directory(c, d)
		l = 1
		if d
			infos = (c == COLUMNS - 2)
			left, wid = get_boundaries(c)

			if d.read? and not d.empty?

				offset = get_offset(d, lines)
				(lines - 1).times do |l|
					lpo = l + offset
					bg = -1
					break if (f = d.files[lpo]) == nil
#					log f

					dir = false
					if f.symlink?
						bld = true
						if f.broken_symlink?
							clr = [1, bg]
						else
							clr = [6, bg]
						end
						dir = f.dir?
					elsif f.dir?
						bld = true
						dir = true
						clr = [4, bg]
					elsif f.movie?
						bld = true
						clr = [5, bg]
					elsif f.executable?
						bld = true
						clr = [2, bg]
					else
						bld = false
						clr = [7, bg]
					end

					fn = f.basename
					if f.marked?
						fn = "* #{fn}"
					end
					if infos
						myinfo = " #{f.infostring}  "
						str = fn[0, wid-1].ljust(wid+1)
						if str.size > myinfo.size
							str[-myinfo.size..-1] = myinfo
							yes = true
						else
							yes = false
						end
						puti l+1, left, str
						if dir and yes
							args = l+1, left+wid-myinfo.size, myinfo.size, *clr
							color_bold_at(*args)
						end
					else
						puti l+1, left, fn[0, wid-1].ljust(wid+1)
					end

					args = l+1, left, fn.size.limit(wid-1), *clr

					if d.pos == lpo
						if c == COLUMNS - 2
#							puti l+1, left-1, '^'
#							puti l+1, left+args[2], '$'

							args[4] = 0
#							args[1] -= 1
#							if args[2] < 5
#								args[2] = 7
#							else
#								args[2] += 1
#							end
#							color_bold_at(l+1, left-1, 1, 0, 0)
#							color_bold_at(l+1, left+args[2], 1, 0, 0)
							color_reverse_bold_at(*args)

							# ...
#							args[1] -= 1; args[2] += 2
#							color_bold_at(*args)
							args[1] += 1; args[2] -= 2
							color_reverse_bold_at(*args)
						else
							color_reverse_at(*args)
						end
#						if f.marked?
#							args[1] += 1
#							args[2] = 1
#							args[3] = 1
#							color_reverse_at(*args)
#						end
					else
						if bld then color_at(*args) else color_at(*args) end
#						if bld then color_bold_at(*args) else color_at(*args) end
					end
				end
			elsif d.read? and d.empty?
				puti l, left, 'empty'.ljust(wid+1)

			elsif not d.read?
				puti l, left, 'reading...'.ljust(wid+1)
				Scheduler << d
			else
				puti l, left, 'ERROR'.ljust(wid+1)

			end
		end

		column_clear(c, l)
	end

	def self.column_clear(n, from=0)
		color(-1,-1)
		left, wid = get_boundaries(n)
		(from -1).upto(lines) do |l|
			puti l+2, left, ' ' * (wid+1)
		end
	end

	def self.get_offset(dir, max)
		pos = dir.pos
		len = dir.files.size
		max -= 2
		if len <= max or pos < max/2
			return 0
		elsif pos >= (len - max/2)
			return len - max
		else
			return pos - max/2
		end
	end

	def self.get_boundaries(column)
		cols = Interface.cols # to cache
		case column
		when 0
			return 0, cols / 8
			
		when 1
			q = cols / 8
			return q, q

		when 2
			q = cols / 4
			w = @path.last.width.limit(cols/2, cols/8)
			return q, w
			
		when 3
			l = cols / 4 + 1
			l += @path.last.width.limit(cols/2, cols/8)

			return l, cols - l
		end
	end

	def self.draw
		bold false
		@cur_y = get_boundaries(COLUMNS-2)[0]

		if @buffer =~ /^block/
			screensaver
		elsif @buffer == '?'
			cleari
			puti 0, "      - - - Help - - -"
			puti 2, "   h/j/k/l: Movement    J/K: fast Movement"
			puti 3, "   H: Descend directory with respect to symlinks"
			puti 4, "   L: Wait for <Enter> after execution of a program"
			puti 6, "   t: Toggle Option     S: Change Sorting"
			puti 7, "   E: Edit file         s: Enter Shell"
			puti 8, "   rmdir: Remove whole dir  dD: Delete file or empty dir"
			puti 9, "   dd: Move file to ~/.trash and memorize it's new path"
			puti 10,"   yy: Memorize path    p: Copy memorized file here"
			puti 11,"   mv<place>: move file to place  mkdir<name>: obvious"
			puti 12,"   mX: Bookmark dir     'X: Enter bookmarked dir"
			puti 13,"   '': Enter last visited dir (note: ' and ` are equal)"
			puti 13,"   !<command> executes command"
			puti 15,"   To interrupt current operations: <Ctrl-C>"
			puti 16,"   To quit: q / ZZ / <Ctrl-D> / <Ctrl-C><Ctrl-C> (twice in a row)"
			puti 18,"   Press one of those keys for more information: g f"
		elsif @buffer == '?f'
			cleari
			puti 0, "      - - - Help - - -"
			puti 2, "   f<regexp> or /<regexp> searches for pattern and presses l"
			puti 3, "       when a matching file is found."
			puti 4, "       Pressing L in this mode is like pressing l outside"
			puti 6, "   F<regexp> like f but stay in this mode until <esc> is pressed"
		elsif @buffer == '?g'
			cleari
			puti 0, "      - - - Help - - -"
			puti 2, "   gg: go to top"
			puti 3, "   G:  go to bottom"
			puti 4, "   g0: go to /"
			puti 5, "   gu: go to /usr/"
			puti 6, "   gm: go to /media/"
			puti 7, "   ge: go to /etc/"
			puti 8, "   gh: go to ~/"
			puti 9, "   gt: go to ~/.trash/"
		else
			@pwd.recheck_stuff()
			cf = currentfile

			if cf and s0 = cf.mimetype
				puti 0, cols-s0.size, s0
			end

			s1 = "  "
			s2 = "#{@path.last.path}#{"/" unless @path.size == 1}"
			s3 = "#{cf ? cf.basename : ''}"
			
			if s0
				puti 0, (s1 + s2 + s3).ljust(cols-s0.size)
			else
				puti 0, (s1 + s2 + s3).ljust(cols)
			end

			bg = -1
			color_at 0, 0, -1, 7, bg
			color_at 0, 0, s1.size, 7, bg
			color_at 0, s1.size, s2.size, 6, bg
			color_at 0, s1.size + s2.size, s3.size, 5, bg

			bold false

			begin
				if cf.dir?
					put_directory(3, @dirs[cf.path])
				elsif cf.file?
					column_put_file(3, cf)
				else
					column_clear(3)
				end
			rescue
				column_clear(3)
			end

			pos_constant = @path.size - COLUMNS + 1

			(COLUMNS - 1).times do |c|
				pos = pos_constant + c

				if pos >= 0
					put_directory(c, @path[pos])
				else
					column_clear(c)
				end
			end

			bold false
			color(-1, -1)
			btm = lines - 1

			case @buffer
			when 'S'
				puti btm, "Sort by (n)ame (s)ize (m)time (c)time (CAPITAL:reversed)"
			when 't'
				puti btm, "Toggle (h)idden_files (d)irs_first (c)olor (f)ilepreview"
			else
#				log(@pwd)
#				log "Buffer: #{@buffer}"
				puti btm, "#@buffer    #{@pwd.file_size.bytes(false)},#{@pwd.size},#{@pwd.pos+1}    ".rjust(cols)
				more = ''
				if cf.symlink?
					more = "#{cf.readlink}"
				end
				puti btm, "  #{Time.now.strftime("%H:%M:%S %a %b %d")}  #{cf.rights} #{more}"

				color_at btm, 23, 10, (cf.writable? ? 6 : 5), -1
				if more
					color_at btm, 34, more.size, (cf.exists? ? 6 : 1), -1
				end
			end

			draw_bars unless @bars.empty?

			movi(@pwd.pos + 1 - get_offset(@pwd, lines), @cur_y)
		end
	end

	def self.draw_bars()
		@bars.each_with_index do |bar, ix|
			bar.update

			l = -ix - 1
			puti l, bar.text[0..cols-1].ljust(cols)
			done = bar.done
			c = (done * cols).to_i
			unless done == 0
				color_at l, 0, c, 0, 4
			end
			unless done == cols
				color_at l, c, -1, 0, 6
			end
		end
	end
end