# _term.py
#
# openipmi generic terminal handling for SoL
#
# Author: MontaVista Software, Inc.
#         Corey Minyard <minyard@mvista.com>
#         source@mvista.com
#
# Copyright 2006 MontaVista Software Inc.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU Lesser General Public License
#  as published by the Free Software Foundation; either version 2 of
#  the License, or (at your option) any later version.
#
#
#  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
#  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
#  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
#  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
#  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
#  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
#  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
#  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#  You should have received a copy of the GNU Lesser General Public
#  License along with this program; if not, write to the Free
#  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#

black = 0
red = 1
green = 2
yellow = 3
blue = 4
magenta = 5
cyan = 6
white = 7

BOLD = 1
UNDERLINE = 2
INVERSE = 4
BLINK = 8
CONCEALED = 16

class TerminalEmulator:
    def __init__(self):
        self.buf = [ ]
        # Mode is a 2-d array of [ cflags, bg color, fg color ]
        self.modes = [ ]
        # Style is (fg, bg, flags)
        for i in range(0, 24):
            self.buf.append([ ])
            self.modes.append([ ])
            for j in range(0, 80):
                self.buf[i].append(" ")
                self.modes[i].append( [0, 0, 7] )
                pass
            pass
        self.cflags = 0
        self.bg_color = black
        self.fg_color = white
        self.x = 0
        self.y = 0
        self.height = 24
        self.width = 80
        self.InputHandler = self.Input0
        self.parms = None
        self.saved_pos = [1, 1]
        self.scroll_region = [0, self.height-1]
        self.keypad_alt = False
        return

    def check_scroll_down(self):
        redraw = False
        starty = self.GetStartY()
        endy = self.GetEndY()
        if (self.y == endy):
            old = self.buf[starty]
            del(self.buf[starty])
            self.buf.insert(endy, old)
            old = self.modes[starty]
            del(self.modes[starty])
            self.modes.insert(endy, old)
            for j in range(0, self.width):
                self.buf[endy][j] = " "
                self.modes[endy][j][0] = 0
                self.modes[endy][j][1] = black
                self.modes[endy][j][2] = white
                pass
            pass
            self.ScrollLines(starty, endy)
        else:
            self.y += 1
            pass
        return

    def check_scroll_up(self):
        starty = self.GetStartY()
        endy = self.GetEndY()
        if (self.y == starty):
            old = self.buf[endy]
            del(self.buf[endy])
            self.buf.insert(starty, old)
            for j in range(0, self.width):
                self.buf[starty][j] = ' '
                self.modes[starty][j][0] = 0
                self.modes[starty][j][1] = black
                self.modes[starty][j][2] = white
                pass
            pass
            self.ScrollLinesUp(starty, endy)
        else:
            self.y -= 1
            pass
        return

    def output_at(self, x, y, slen):
        s = ""
        i = 0
        last_mode = [ 0, 0, 7 ]
        lastx = 0
        while (i < slen):
            if (len(s) > 0):
                if (last_mode != self.modes[y][x+i]):
                    # Character mode change, output what we have and switch.
                    self.DrawText(last_mode[2], last_mode[1], last_mode[0],
                                  x, y, s)
                    s = ""
                    pass
                pass
            else:
                last_mode = self.modes[y][x+i]
                lastx = x + i
                pass
            s += self.buf[y][x+i]
            i += 1
            pass
        self.DrawText(last_mode[2], last_mode[1], last_mode[0],
                      lastx, y, s)
        return

    def handle_cursor(self):
        if (self.x == self.width):
            xpos = self.x - 1
        else:
            xpos = self.x
            pass
        mode = self.modes[self.y][xpos]
        self.DrawCursor(mode[2], mode[1], mode[0], xpos, self.y,
                        self.buf[self.y][xpos])
        return

    def restore_cursor(self):
        if (self.x == self.width):
            self.output_at(self.x-1, self.y, 1)
            pass
        else:
            self.output_at(self.x, self.y, 1)
            pass
        return
        
    def output_str(self, s):
        if (len(s) == 0):
            return
        do_scroll = False
        if (self.x == self.width):
            # Cursor is at the end of the line, redraw the char where
            # the cursor is sitting.
            self.restore_cursor()
            self.x = 0;
            self.check_scroll_down()
            pass
        while ((self.x + len(s)) > self.width):
            # The string exceeds the line length, do it in pieces
            outlen = self.width - self.x
            do_scroll = True
            self.buf[self.y][self.x:self.x+outlen] = s[0:outlen]
            self.output_at(self.x, self.y, outlen)
            self.x = 0;
            s = s[outlen:]
            self.check_scroll_down()
            pass
        outlen = len(s)
        for i in range(0, outlen):
            self.buf[self.y][self.x+i] = s[i]
        for i in range(self.x, self.x+outlen):
            self.modes[self.y][i][0] = self.cflags
            self.modes[self.y][i][1] = self.bg_color
            self.modes[self.y][i][2] = self.fg_color
            pass
        self.output_at(self.x, self.y, outlen)
        self.x += outlen
        self.handle_cursor()
        return

    def GetParm(self, n, default = 1):
        if (self.parms == None):
            return default
        elif (len(self.parms) <= n):
            return default
        return self.parms[n]

    # Get the current upper bound of the cursor, used for scroll regions.
    def GetStartY(self):
        if ((self.y >= self.scroll_region[0])
            and (self.y <= self.scroll_region[1])):
            return self.scroll_region[0]
        return 0

    # Get the current lower bound of the cursor, used for scroll regions.
    def GetEndY(self):
        if ((self.y >= self.scroll_region[0])
            and (self.y <= self.scroll_region[1])):
            return self.scroll_region[1]
        return self.height - 1

    # After '\e['
    def Input2(self, c, s):
        if (c == 'A'): # Up
            count = self.GetParm(0)
            starty = self.GetStartY()
            self.restore_cursor()
            if (count > (self.y - starty)):
                self.y = starty
            else:
                self.y -= count
                pass
            self.handle_cursor();
            pass
        elif (c == 'B'): # Down
            count = self.GetParm(0)
            endy = self.GetEndY()
            self.restore_cursor()
            if (count > (endy - self.y)):
                self.y = endy
            else:
                self.y += count
                pass
            self.handle_cursor();
            pass
        elif (c == 'C'): # Right
            count = self.GetParm(0)
            self.restore_cursor()
            if (count > (self.width - self.x - 1)):
                self.x = self.width - 1
            else:
                self.x += count
                pass
            self.handle_cursor();
            pass
        elif (c == 'D'): # Right
            count = self.GetParm(0)
            self.restore_cursor()
            if (count > self.x):
                self.x = 0
            else:
                self.x -= count
                pass
            self.handle_cursor();
            pass
        elif (c == '?'): # FIXME: Not sure what this does
            return "" # Stay in Input2
        elif ((c >= '0') and (c <= '9')):
            if (self.parms == None):
                self.parms = [ int(c) ]
            else:
                currparm = len(self.parms) - 1
                self.parms[currparm] *= 10
                self.parms[currparm] += int(c)
                pass
            return "" # Stay in Input2
        elif (c == ';'): # Next parm
            if (self.parms == None):
                self.parms = [ 0, 0 ]
            else:
                self.parms.append(0)
                pass
            return "" # Stay in Input2
        elif (c == 'r'): # Scroll region
            y1 = self.GetParm(0, -1)
            y2 = self.GetParm(1, -1)
            if ((y1 == -1) or (y2 == -1)):
                if ((y1 == -1) and (y2 == -1)):
                    self.scroll_region[0] = 0
                    self.scroll_region[1] = self.height - 1
                    pass
                pass
            elif ((y1 > y2) or (y1 < 1) or (y2 < 1)
                  or (y1 >= (self.height+1)) or (y2 >= (self.height+1))):
                # Bogus values, just ignore them.
                pass
            else:
                self.scroll_region[0] = y1 - 1
                self.scroll_region[1] = y2 - 1
                pass
            pass
        elif ((c == 'H') or (c == 'f')): # Move to position specified
            y = self.GetParm(0)
            x = self.GetParm(1)
            if (x < 1):
                x = 1
                pass
            elif (x > self.width):
                x = self.width
                pass
            if (y < 1):
                y = 1
                pass
            if (y > self.height):
                y = self.height
                pass
            self.restore_cursor()
            self.x = x - 1
            self.y = y - 1
            self.handle_cursor();
            pass
        elif (c == 's'): # save cursor position
            self.saved_pos[0] = self.x
            self.saved_pos[1] = self.y
            pass
        elif (c == 'u'): # Restore cursor position
            self.restore_cursor()
            self.x = self.saved_pos[0]
            self.y = self.saved_pos[1]
            self.handle_cursor();
            pass
        elif (c == 'J'): # Clear screen area
            mode = self.GetParm(0, -1)
            if (mode == -1):
                starty = self.y
                length = self.height - self.y
                pass
            elif (mode == 1):
                starty = 0
                length = self.y + 1
                pass
            elif (mode == 2):
                starty = 0
                length = self.height
                pass
            else:
                starty = 0
                length = 0
                pass
            for y in range(starty, starty + length):
                for x in range(0, self.width):
                    self.buf[y][x] = " "
                    self.modes[y][x][0] = 0
                    self.modes[y][x][1] = black
                    self.modes[y][x][2] = white
                    pass
                self.output_at(0, y, self.width)
                pass
            self.handle_cursor();
            pass
        elif (c == 'K'): # Clear line
            mode = self.GetParm(0, 0)
            y = self.y
            if (mode == 0): # To end of line
                startx = self.x
                length = self.width - self.x
                pass
            elif (mode == 1): # To start of line
                startx = 0
                length = self.x + 1
                pass
            elif (mode == 2): # Whole line
                startx = 0
                length = self.width
                pass
            else: # Ignore
                startx = 0
                length = 0
                pass
            for x in range(startx, startx+length):
                self.buf[y][x] = " "
                self.modes[y][x][0] = 0
                self.modes[y][x][1] = black
                self.modes[y][x][2] = white
                pass
            self.output_at(startx, y, length)
            self.handle_cursor();
        elif (c == 'm'): # Graphics mode
            i = 0
            val = self.GetParm(i, 0)
            while (val != -1):
                if (val == 0):
                    self.cflags = 0
                    self.bg_color = black
                    self.fg_color = white
                elif (val == 1):
                    self.cflags |= BOLD
                elif (val == 4):
                    self.cflags |= UNDERLINE
                elif (val == 5):
                    self.cflags |= BLINK
                elif (val == 7):
                    self.cflags |= INVERSE
                elif (val == 8):
                    self.cflags |= CONCEALED
                elif ((val >= 30) and (val <= 37)):
                    self.fg_color = val - 30
                elif ((val >= 40) and (val <= 47)):
                    self.bg_color = val - 40
                    pass
                i += 1
                val = self.GetParm(i, -1)
                pass
            pass
        elif (c == 'g'):
             # FIXME: \e[2g means clear tabs, so does 3g, 0g or just g
             # means current tab
            pass
        elif (c == 'P'): # delete parm characters (1 default)
            count = self.GetParm(0, 1)
            if (count > (self.width - self.x)):
                count = self.width - self.x
                pass
            y = self.y
            x = self.x
            for i in range(0, count):
                del self.buf[y][x]
                self.buf[y].append(' ')
                old = self.modes[y][x]
                del self.modes[y][x]
                old[0] = 0
                old[1] = black
                old[2] = white
                self.modes[y].append(old)
                pass
            self.DeleteChars(x, y, count)
            self.handle_cursor()
            pass
        elif (c == 'M'): # delete parm lines (1 default)
            count = self.GetParm(0, 1)
            if (count > (self.height - self.y)):
                count = self.height - self.y
                pass
            for i in range(0, count):
                old = self.buf[self.y]
                del self.buf[self.y]
                self.buf.append(old)
                old = self.modes[self.y]
                del self.modes[self.y]
                self.modes.append(old)
                for j in range(0, self.width):
                    self.buf[self.height-1][j] = ' '
                    self.modes[self.height-1][j][0] = 0
                    self.modes[self.height-1][j][1] = black
                    self.modes[self.height-1][j][2] = white
                    pass
                self.ScrollLines(self.y, self.height-1)
                pass
            self.handle_cursor()
            pass
        elif (c == 'L'): # insert parm lines (1 default)
            self.restore_cursor()
            count = self.GetParm(0, 1)
            if (count > (self.height - self.y)):
                count = self.height - self.y
                pass
            for i in range(0, count):
                old = self.buf[self.height-1]
                del self.buf[self.height-1]
                self.buf.insert(self.y, old)
                for j in range(0, self.width):
                    self.buf[self.y][j] = ' '
                    self.modes[self.y][j][0] = 0
                    self.modes[self.y][j][1] = black
                    self.modes[self.y][j][2] = white
                    pass
                self.ScrollLinesUp(self.y, self.height-1)
                pass
            self.handle_cursor()
            pass
        elif (c == 'Z'): # Move to previous tab stop
            self.restore_cursor()
            self.x = ((self.x-1) / 8) * 8
            self.handle_cursor();
            pass
        elif (c == '@'): # insert parm chars (1 default)
            self.restore_cursor()
            count = self.GetParm(0, 1)
            if (count > (self.width - self.x)):
                count = self.width - self.x
                pass
            y = self.y
            x = self.x
            for i in range(0, count):
                del self.buf[y][self.width-1]
                old = self.modes[y][self.width-1]
                del self.modes[y][self.width-1]
                old[0] = 0
                old[1] = black
                old[2] = white
                self.buf[y].insert(self.x, ' ')
                self.modes[y].insert(self.x, old)
                pass
            self.InsertChars(x, y, count)
            self.handle_cursor()
            pass
        elif (c == 'S'): # scroll forward parm lines (1 default)
            self.restore_cursor()
            count = self.GetParm(0, 1)
            if (count > self.height):
                count = self.height
                pass
            for i in range(0, count):
                old = self.buf[0]
                del self.buf[0]
                self.buf.append(old)
                old = self.modes[0]
                del self.modes[0]
                self.modes.append(old)
                for j in range(0, self.width):
                    self.buf[self.height-1][j] = ' '
                    self.modes[self.height-1][j][0] = 0
                    self.modes[self.height-1][j][1] = black
                    self.modes[self.height-1][j][2] = white
                    pass
                self.ScrollLines(0, self.height-1)
                pass
            self.handle_cursor()
            pass
        elif (c == 'T'): # scroll back parm lines (1 default)
            self.restore_cursor()
            count = self.GetParm(0, 1)
            if (count > self.height):
                count = self.height
                pass
            for i in range(0, count):
                old = self.buf[self.height-1]
                del self.buf[self.height-1]
                self.buf.insert(0, old)
                old = self.modes[self.height-1]
                del self.modes[self.height-1]
                self.modes.insert(0, old)
                for j in range(0, self.width):
                    self.buf[0][j] = ' '
                    self.modes[0][j][0] = 0
                    self.modes[0][j][1] = black
                    self.modes[0][j][2] = white
                    pass
                self.ScrollLinesUp(0, self.height-1)
                pass
            self.handle_cursor()
            pass
        elif (c == 'G'): # Move cursor to column parm (1 default)
            self.restore_cursor()
            pos = self.GetParm(0, 1)
            if (pos > self.width):
                pos = self.width
                pass
            elif (pos < 1):
                return ""
            self.x = pos - 1
            self.handle_cursor()
            pass
        elif (c == 'd'): # Move cursor to line parm (1 default)
            self.restore_cursor()
            pos = self.GetParm(0, 1)
            if (pos > self.height):
                pos = self.height
                pass
            elif (pos < 1):
                return ""
            self.y = pos - 1
            self.handle_cursor()
            pass
        elif (c == 'X'): # erase parm characters (1 default) (no cursor move)
            count = self.GetParm(0, 1)
            if (count > (self.height - self.y)):
                count = self.height - self.y
                pass
            for i in range(0, count):
                self.buf[self.y][self.x+i] = " "
                self.modes[self.y][self.x+i][0] = 0
                self.modes[self.y][self.x+i][1] = black
                self.modes[self.y][self.x+i][2] = white
                pass
            self.output_at(self.x, self.y, count)
            self.handle_cursor()
            pass
        elif (c == 'c'): # Identify terminal
            # Identify ourself as "linux"
            self.HandleTerminalOutput("\x1b[?62;9;c")
            pass
        self.InputHandler = self.Input0
        return ""

    # After an escape
    def Input1(self, c, s):
        if (c == '['):
            self.InputHandler = self.Input2
            return ""
        elif (c == 'D'): # Scroll down
            self.restore_cursor()
            self.check_scroll_down()
            self.handle_cursor();
        elif (c == 'M'): # Scroll up
            self.restore_cursor()
            self.check_scroll_up()
            self.handle_cursor();
            pass
        elif (c == 'H'): # FIXME: Set tabulator stop in all rows at current column
            pass
        elif (c == 'c'): # reset terminal
            for y in range(0, self.height):
                for x in range(0, self.width):
                    self.buf[y][x] = " "
                    self.modes[y][x][0] = 0
                    self.modes[y][x][1] = black
                    self.modes[y][x][2] = white
                    pass
                self.output_at(0, y, self.width)
                pass
            self.x = 0
            self.y = 0
            self.cflags = 0
            self.bg_color = black
            self.fg_color = white
            self.handle_cursor();
            pass
        elif ((c >= '0') and (c <= '9')):
            if (self.parms == None):
                self.parms = [ int(c) ]
            else:
                currparm = len(self.parms) - 1
                self.parms[currparm] *= 10
                self.parms[currparm] += int(c)
                pass
            return "" # Stay in Input1
        elif (c == 'n'): # Terminal state
            op = self.GetParm(0, 0)
            if (op == 5): # Requesting terminal status
                self.HandleTerminalOutput("\x1b0n") # We are ok
            elif (op == 6): # Current cursor position
                self.HandleTerminalOutput("\x1b%d;%dR" % (self.y+1, self.x+1))
            pass
        elif (c == '='): # alternate keypad mode
            self.keypat_alt = True
            pass
        elif (c == '>'): # alternate keypad mode off
            self.keypat_alt = False
            pass
        self.InputHandler = self.Input0
        return ""

    # "normal" input mode
    def Input0(self, c, s):
        if ((c >= ' ') and (c <= '~')):
            return s + c
        else:
            self.output_str(s)
            if (c == '\n'):
                self.restore_cursor()
                self.check_scroll_down()
                self.handle_cursor();
                pass
            elif (c == '\r'):
                self.restore_cursor()
                self.x = 0
                self.handle_cursor();
                pass
            elif (c == '\t'):
                self.restore_cursor()
                if (self.x >= self.width-8):
                    self.x = self.width-1
                else:
                    self.x = ((self.x / 8) * 8) + 8
                    pass
                self.handle_cursor();
                pass
            elif (c == '\007'): #bell
                self.Bell()
            elif (c == '\010'): #backspace
                if (self.x > 0):
                    self.restore_cursor()
                    self.x -= 1
                    self.handle_cursor();
                    pass
                pass
            elif (c == '\x1b'):
                self.parms = None
                self.InputHandler = self.Input1
                pass
            pass
        return ""
    
    def ProcessInput(self, data):
        s = ""
        for c in data:
            s = self.InputHandler(c, s)
            pass
        self.output_str(s)
        return

    def ResizeTerminal(self, w, h):
        return

    def Width(self):
        return self.width

    def Height(self):
        return self.height

    def Update(self):
        return

    def Reset(self):
        return
    
    pass