import datetime, grp, md5, os, pwd, re, sets, shutil, stat, string
import aes, dirutil, regex, highlight, lex
from point import Point

#from point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Pointfrom point import Point

# undo/redo stack constants
ACT_NORM    = 0
ACT_UNDO    = 1
ACT_REDO    = 2
STACK_LIMIT = 1024

class ReadOnlyError(Exception):
    pass

# used for multiple text additions/deletions
class GroupMove(object):
    def __init__(self, buffer, p, moves):
        self.buffer = buffer
        self.lines  = lines
        self.moves  = moves
    def restore(self, act=ACT_UNDO):
        assert act == ACT_UNDO or act == ACT_REDO
        for move in self.moves:
            move.restore(act)
    def getpos(self):
        return self.moves[-1].getpos()

# used for undo/redo stacks when text will need to be added back
class AddMove(object):
    def __init__(self, buffer, p, lines):
        self.buffer = buffer
        self.p = p
        self.lines = lines
    def restore(self, act=ACT_UNDO):
        assert act == ACT_UNDO or act == ACT_REDO
        self.buffer.insert_lines(self.p, self.lines, act)
    def getpos(self):
        return self.p

# used for undo/redo stacks when text will need to be removed
class DelMove(object):
    def __init__(self, buffer, p1, p2):
        self.buffer = buffer
        self.p1 = p1
        self.p2 = p2
    def restore(self, act):
        assert act == ACT_UNDO or act == ACT_REDO
        self.buffer.delete(self.p1, self.p2, act)
    def getpos(self):
        return self.p1

# abstract class
class Buffer(object):
    btype = 'generic'
    def __init__(self, nl='\n', stack_limit=STACK_LIMIT):
        assert nl in ('\n', '\r', '\r\n'), "Invalid line ending"
        self.lines       = [""]
        self.windows     = []
        self.undo_stack  = []
        self.redo_stack  = []
        self.stack_limit = stack_limit
        self.nl          = nl
        self.modified    = False
        self.highlights  = {}
        self.indentlvl   = 4

    # basic file operation stuff
    def _open_file_r(self, path):
        path = os.path.realpath(path)
        if not os.path.isfile(path):
            raise Exception, "Path '%s' does not exist" % (path)
        if not os.access(path, os.R_OK):
            raise Exception, "Path '%s' cannot be read" % (path)
        f = open(path, 'r')
        return f
    def _open_file_w(self, path):
        if os.path.isfile(path):
            raise Exception, "Path '%s' already exists" % (path)
        d = os.path.dirname(path)
        if not os.access(d, os.R_OK):
            raise Exception, "Dir '%s' cannot be read" % (path)
        if not os.access(d, os.W_OK):
            raise Exception, "Dir '%s' cannot be written" % (path)
        f = open(path, 'w')
        return f
    def _temp_path(self, path):
        (dirname, basename) = os.path.split(path)
        return os.path.join(dirname, ".__%s__pmacs" % (basename))

    # undo/redo stack
    def _stack_trim(self, stack):
        if self.stack_limit:
            while len(stack) > self.stack_limit:
                stack.pop(0)
    def add_to_stack(self, move, act):
        if act == ACT_NORM:
            self.redo_stack = []
            self.undo_stack.append(move)
            self._stack_trim(self.undo_stack)
        elif act == ACT_UNDO:
            self.redo_stack.append(move)
            self._stack_trim(self.redo_stack)
        elif act == ACT_REDO:
            self.undo_stack.append(move)
            self._stack_trim(self.undo_stack)
        else:
            raise Exception, "Invalid act: %d" % (act)
    def undo(self):
        if len(self.undo_stack):
            move = self.undo_stack.pop(-1)
            move.restore(ACT_UNDO)
            return move.getpos()
        else:
            raise Exception, "Nothing to Undo!"
    def redo(self):
        if len(self.redo_stack):
            move = self.redo_stack.pop(-1)
            move.restore(ACT_REDO)
            return move.getpos()
        else:
            raise Exception, "Nothing to Redo!"

    # window-buffer communication
    def add_window(self, w):
        if w not in self.windows:
            self.windows.append(w)
            modename = w.mode.name()
            if modename not in self.highlights and w.mode.lexer is not None:
                self.highlights[modename] = highlight.Highlighter(w.mode.lexer)
                self.highlights[modename].highlight(self.lines)

    def remove_window(self, w):
        if w in self.windows:
            self.windows.remove(w)
            modename = w.mode.name()
            found = False
            for w2 in self.windows:
                if w2.mode.name() == modename:
                    found = True
                    break
            if not found:
                del self.highlights[modename]
    def _region_add(self, p1, p2, lines, act):
        move = DelMove(self, p1, p2)
        self.add_to_stack(move, act)
        for w in self.windows:
            w.region_added(p1, lines)
        for name in self.highlights:
            self.highlights[name].relex_add(self.lines, p1.y, p1.x, lines)
    def _region_del(self, p1, p2, lines, act):
        move = AddMove(self, p1, lines)
        self.add_to_stack(move, act)
        for w in self.windows:
            w.region_removed(p1, p2)
        for name in self.highlights:
            self.highlights[name].relex_del(self.lines, p1.y, p1.x, p2.y, p2.x)

    # internal validation
    def _validate_point(self, p):
        self._validate_xy(p.x, p.y)
    def _validate_xy(self, x, y):
        assert y >= 0 and y < len(self.lines), \
            "xy1: %d >= 0 and %d < %d" % (y, y, len(self.lines))
        assert x >= 0 and x <= len(self.lines[y]), \
            "xy2: %d >= 0 and %d <= %d" % (x, x, len(self.lines[y]))
    def _validate_y(self, y):
        assert y >= 0 and y < len(self.lines), \
            "y: %d >= 0 and %d < %d" % (y, y, len(self.lines))

    # deal with the actual logical document string
    def num_chars(self):
        n = 0
        for line in self.lines[:-1]:
            n += len(line) + 1
        n += len(self.lines[-1])
        return n
    def num_lines(self):
        return len(self.lines)
    def make_string(self, nl='\n'):
        return nl.join(self.lines)

    # methods to be overridden by subclasses
    def name(self):
        return "Generic"
    def close(self):
        pass
    def open(self):
        pass
    def changed(self):
        return self.modified
    def reload(self):
        raise Exception, "%s reload: Unimplemented" % (self.name())
    def save_as(self, path, force=False):
        # check to see if the path exists, and if we're prepared to overwrite it
        # if yes to both, get its mode so we can preserve the path's permissions
        mode = None
        if os.path.exists(path):
            if force:
                mode = os.stat(self.path)[0]
            else:
                raise Exception, "oh no! %r already exists" % path

        # create the string that we're going to write into the file
        data = self.write_filter(self.make_string(nl=self.nl))

        # create a safe temporary path to write to, and write out data to it
        temp_path = self._temp_path()
        f2 = self._open_file_w(temp_path)
        f2.write(data)
        f2.close()

        # move the temporary file to the actual path; maybe change permissions
        shutil.move(temp_path, path)
        if mode:
            os.chmod(path, mode)

        # the file has not been modified now
        self.modified = False
    def readonly(self):
        return False
    def read_filter(self, data):
        return data
    def write_filter(self, data):
        return data

    # point retrieval
    def get_buffer_start(self):
        return Point(0, 0)
    def get_buffer_end(self):
        return Point(len(self.lines[-1]), len(self.lines) - 1)

    # data retrieval
    def get_sublines(self, p1, p2):
        self._validate_point(p1)
        self._validate_point(p2)
        assert p1 <= p2, "p1.x (%d) > p2.x (%d)" % (p1.x, p2.x)
        lines = []
        x = p1.x
        for i in range(p1.y, p2.y):
            lines.append(self.lines[i][x:])
            x = 0
        lines.append(self.lines[p2.y][x:p2.x])
        return lines
    def get_substring(self, p1, p2):
        lines = self.get_sublines(p1, p2)
        return '\n'.join(lines)

    # buffer set
    def set_lines(self, lines, force=False):
        if not force and self.readonly():
            raise Exception, "set_data: buffer is readonly"
        start = self.get_buffer_start()
        end   = self.get_buffer_end()
        self.delete(start, end, force=force)
        self.insert_lines(start, lines, force=force)
        self.modified = True
    def set_data(self, data, force=False):
        lines = data.split('\n')
        self.set_lines(lines, force)

    # insertion into buffer
    def insert_lines(self, p, lines, act=ACT_NORM, force=False):
        #if lines == ['(']:
        #    raise Exception, "damn"
        llen = len(lines)
        assert llen > 0
        if not force and self.readonly():
            raise ReadOnlyError, "buffer is read-only"
        p2 = p.vadd(len(lines[-1]), llen - 1)
        if llen > 1:
            self.lines.insert(p.y + 1, [])
            self.lines[p.y + 1] = lines[-1] + self.lines[p.y][p.x:]
            self.lines[p.y] = self.lines[p.y][:p.x] + lines[0]
            for i in range(1, llen - 1):
                self.lines.insert(p.y + i, lines[i])
        else:
            self.lines[p.y] = self.lines[p.y][:p.x] + lines[-1] + self.lines[p.y][p.x:]
        self._region_add(p, p2, lines, act)
        self.modified = True
    def insert_string(self, p, s, act=ACT_NORM, force=False):
        lines = s.split("\n")
        self.insert_lines(p, lines, act, force)
        
    # deletion from buffer
    def delete(self, p1, p2, act=ACT_NORM, force=False):
        """delete characters from p1 up to p2 from the buffer"""
        if not force and self.readonly():
            raise ReadOnlyError, "buffer is read-only"
        self._validate_point(p1)
        self._validate_point(p2)
        if p1 == p2:
            return
        assert p1 < p2, "p1 %r > p2 %r" % (p1, p2)
        lines = self.get_sublines(p1, p2)
        line1 = self.lines[p1.y]
        line2 = self.lines[p2.y]
        self.lines[p1.y:p2.y+1] = ["%s%s" % (line1[:p1.x], line2[p2.x:])]
        self._region_del(p1, p2, lines, act)
        self.modified = True
    def delete_char(self, p, act=ACT_NORM, force=False):
        if p.x == len(self.lines[p.y]):
            p2 = Point(0, p.y + 1)
        else:
            p2 = Point(p.x + 1, p.y)
        self.delete(p, p2, act=act, force=force)
    def overwrite_char(self, p, c, act=ACT_NORM, force=False):
        self.delete_char(p, act=act, force=force)
        self.insert_string(p, c, act=act, force=force)
    def delete_line(self, y, act=ACT_NORM, force=False):
        line = self.lines[y]
        p1 = Point(0, y)
        if y < len(self.lines) - 1:
            p2 = Point(0, y + 1)
        else:
            p2 = Point(len(self.lines[-1]), y)
        self.delete(p1, p2, act, force)

    # random
    def count_leading_whitespace(self, y):
        line = self.lines[y]
        m = regex.leading_whitespace.match(line)
        if m:
            return m.end()
        else:
            # should not happen
            raise Exception, "iiiijjjj"

# scratch is a singleton
scratch = None
class ScratchBuffer(Buffer):
    btype = 'scratch'
    def __new__(cls, *args, **kwargs):
        global scratch
        if scratch is None:
            scratch = object.__new__(ScratchBuffer, *args, **kwargs)
        return scratch
    def name(self):
        return "*Scratch*"
    def close(self):
        global scratch
        scratch = None

class DataBuffer(Buffer):
    btype = 'data'
    def __init__(self, name, data, nl='\n'):
        Buffer.__init__(self, nl)
        self._name = name
        self.lines = data.split("\n")
    def name(self):
        return self._name
    def close(self):
        pass
    def readonly(self):
        return True

# console is another singleton
console = None
class ConsoleBuffer(Buffer):
    btype    = 'console'
    modename = 'console'
    def __new__(cls, *args, **kwargs):
        global console
        if console is None:
            b = object.__new__(ConsoleBuffer, *args, **kwargs)
            console = b
        return console
    def __init__(self, nl='\n'):
        Buffer.__init__(self, nl)
        self.clear()
    def clear(self):
        lines = ['Python Console\n',
                 "Evaluate python expressions in the editor's context (self)\n",
                 'Press Control-] to exit\n',
                 '\n']
        console.set_data(''.join(lines), force=True)
    def name(self):
        return '*Console*'
    def changed(self):
        return False
    def close(self):
        global console
        console = None
    def readonly(self):
        return True

class BinaryDataException(Exception):
    pass

class FileBuffer(Buffer):
    btype = 'file'
    def __init__(self, path, nl='\n', name=None):
        '''fb = FileBuffer(path)'''
        Buffer.__init__(self, nl)
        self.path = os.path.realpath(path)
        self.checksum = None
        if name is None:
            self._name = os.path.basename(self.path)
        else:
            self._name = name
        if os.path.exists(self.path) and not os.access(self.path, os.W_OK):
            self._readonly = True
        else:
            self._readonly = False
    def readonly(self):
        return self._readonly

    def _open_file_r(self, path=None):
        if path is None:
            path = self.path
        path = os.path.realpath(path)
        self.path = path
        if not os.path.isfile(path):
            raise Exception, "Path '%s' does not exist" % (path)
        if not os.access(path, os.R_OK):
            raise Exception, "Path '%s' cannot be read" % (path)
        f = open(path, 'r')
        return f
    def _open_file_w(self, path=None):
        if path is None:
            path = self.path
        if os.path.isfile(path):
            raise Exception, "Path '%s' already exists" % (path)
        d = os.path.dirname(path)
        if not os.access(d, os.R_OK):
            raise Exception, "Dir '%s' cannot be read" % (path)
        if not os.access(d, os.W_OK):
            raise Exception, "Dir '%s' cannot be written" % (path)
        f = open(path, 'w')
        return f
    def _temp_path(self, path=None):
        if path is None:
            path = self.path
        (dirname, basename) = os.path.split(path)
        return os.path.join(dirname, ".__%s__pmacs" % (basename))

    # methods for dealing with the underlying resource, etc.
    def name(self):
        #return self.path
        return self._name
    def path_exists(self):
        return os.path.exists(self.path)
    def store_checksum(self, data):
        self.checksum = md5.new(data)
    def read(self):
        if self.path_exists():
            f = self._open_file_r()
            data = f.read()
            f.close()
            self.store_checksum(data)
        else:
            data = ''
        data = self.read_filter(data)
        data = data.replace("\t", "    ")
        for i in range(0, min(len(data), 8)):
            if data[i] not in string.printable:
                raise BinaryDataException, "binary files are not supported"
        #FIXME: this is horrible...but maybe not as horrible as using tabs??
        return data
    def open(self):
        data = self.read()
        self.lines = data.split(self.nl)
    def reload(self):
        data = self.read()
        self.set_data(data)
    def changed_on_disk(self):
        assert self.checksum is not None
        f = open(self.path)
        data = f.read()
        f.close()
        m = md5.new(data)
        return self.checksum.digest() != m.digest()
    def save(self, force=False):
        if self.readonly():
            raise ReadOnlyError, "can't save read-only file"

        if self.checksum is not None and force is False:
            # the file already existed and we took a checksum so make sure it's
            # still the same right now
            if not self.path_exists():
                raise Exception, "oh no! %r disappeared!" % self.path
            if self.changed_on_disk():
                raise Exception, "oh no! %r has changed on-disk!" % self.path

        temp_path = self._temp_path()
        data = self.make_string(nl=self.nl)
        if self.windows[0].mode.savetabs:
            data = data.replace("    ", "\t")
            
        data = self.write_filter(data)

        f2 = self._open_file_w(temp_path)
        f2.write(data)
        f2.close()

        if self.path_exists():
            mode = os.stat(self.path)[0]
            os.chmod(temp_path, mode)

        shutil.move(temp_path, self.path)
        self.store_checksum(data)
        self.modified = False
    def save_as(self, path):
        self.path = path
        self.save()

class AesBuffer(FileBuffer):
    btype = 'aesfile'
    def __init__(self, path, password, nl='\n', name=None):
        '''fb = FileBuffer(path)'''
        FileBuffer.__init__(self, path, nl, name)
        self.password = password
    def read_filter(self, data):
        return aes.decrypt_data(data, self.password)
    def write_filter(self, data):
        return aes.encrypt_data(data, self.password)

class Binary32Buffer(FileBuffer):
    btype = 'bin32file'
    wordsize = 4
    numwords = 4
    def __init__(self, path, nl='\n', name=None):
        '''fb = FileBuffer(path)'''
        FileBuffer.__init__(self, path, nl, name)
    def read_filter(self, data):
        lines = []
        i = 0
        while i < len(data):
            j = 0
            words = []
            while j < self.numwords * self.wordsize and i + j < len(data):
                nibbles = []
                for c in data[i + j:i + j + self.wordsize]:
                    nibbles.append(string.hexdigits[ord(c) / 16])
                    nibbles.append(string.hexdigits[ord(c) % 16])
                words.append(''.join(nibbles))
                j += self.wordsize
            lines.append(' '.join(words))
            i += self.numwords * self.wordsize
        return '\n'.join(lines)
    def write_filter(self, data):
        bytes = []
        lastc = None
        for c in data:
            if c not in '0123456789abcdefABCDEF':
                pass
            elif lastc is None:
                lastc = c
            else:
                bytes.append(chr(int(lastc + c, 16)))
                lastc = None
        if lastc is not None:
            bytes.append(chr(int(lastc + '0', 16)))
        return ''.join(bytes)

class Binary64Buffer(Binary32Buffer):
    wordsize = 8
    numwords = 2

class DirBuffer(Buffer):
    btype = 'dir'
    def __init__(self, path, nl='\n', name=None):
        Buffer.__init__(self, nl)
        self.path = os.path.realpath(path)
    def changed(self):
        return False
    def readonly(self):
        return True
    def name(self):
        return self.path
    def path_exists(self):
        return os.path.exists(self.path)

    def _get_names(self):
        if not self.path_exists():
            raise Exception, "directory %r does not exists" % self.path
        names = os.listdir(self.path)
        if self.path != '/':
            names.insert(0, '..')
        names.insert(0, '.')
        return names
    def _make_path(self, name):
        return os.path.join(self.path, name)
    def _get_lines(self):
        names = self._get_names()

        fieldlines = []
        maxlens = [0] * 5
        for name in names:
            path = self._make_path(name)
            fields = dirutil.path_fields(path, name)
            for i in range(0, 5):
                try:
                    maxlens[i] = max(maxlens[i], len(fields[i]))
                except:
                    raise Exception, '%d %r' % (i, fields[i])
            fieldlines.append(fields)
        
        fieldlines.sort(cmp=dirutil.path_sort)
        fmt = '%%%ds %%-%ds %%-%ds %%%ds %%%ds %%s' % tuple(maxlens)

        lines = []
        for fields in fieldlines:
            s = fmt % fields
            lines.append(s)
        return lines
    def open(self):
        self.lines = self._get_lines()
    def reload(self):
        lines = self._get_lines()
        self.set_lines(lines, force=True)
    def save(self, force=False):
        raise Exception, "can't save a directory buffer"
    def save_as(self, path):
        raise Exception, "can't save a directory buffer"

class PathListBuffer(DirBuffer):
    btype = 'pathlist'
    def __init__(self, name, paths, nl='\n'):
        Buffer.__init__(self, nl)
        self.paths = list(paths)
        self.path  = os.getcwd()
        self._name = name
    def path_exists(self):
        raise Exception
    def _get_names(self):
        cwd = os.getcwd()
        return [x.replace(cwd, '.', 1) for x in self.paths]
    def _make_path(self, name):
        if name.startswith('.'):
            return name.replace('.', os.getcwd(), 1)
        else:
            return name
    def name(self):
        return self._name

# NOTE: this highlighter will not reprocess the data given. it is intended to
#       be used with read-only buffers like DataBuffer and ColorBuffer
class ColorHighlighter(highlight.Highlighter):
    color_re = re.compile(r'\[([a-zA-Z0-9\*:]+)\]')
    color_map = {
        'B': 'black',
        'r': 'red',
        'g': 'green',
        'y': 'yellow',
        'b': 'blue',
        'm': 'magenta',
        'c': 'cyan',
        'w': 'white',
        'd': 'default',
        '*': 'bold',
    }
    def __init__(self):
        self.tokens = []
    def append_token(self, y, x, s, color):
        s2 = s.replace('\\[', '[')
        s2 = s2.replace('\\]', ']')
        s2 = s2.replace('\\\\', '\\')
        t = lex.Token('color_data', None, y, x, s2, color)
        self.tokens[y].append(t)
        return len(s) - len(s2)
    def highlight(self, lines):
        if self.tokens:
            return
        self.tokens = [None] * len(lines)
        for y in range(0, len(lines)):
            self.tokens[y] = []
            line = lines[y]
            c = ['default', 'default']
            i = 0
            offset = 0
            while i < len(line):
                m = self.color_re.search(line, i)
                if m:
                    (j, k) = (m.start(), m.end())
                    if j > i:
                        offset += self.append_token(y, i - offset, line[i:j], c)
                    fields = m.group(1).split(':')
                    c = [self.color_map.get(x, x) for x in fields]
                    offset += k - j
                    i = k
                else:
                    offset += self.append_token(y, i - offset, line[i:], c)
                    break

class ColorDataBuffer(DataBuffer):
    btype    = 'colordata'
    modename = 'colortext'
    color_re = re.compile(r'\[([a-z:]+)\]')
    def __init__(self, name, data, nl='\n'):
        data2 = ColorHighlighter.color_re.sub('', data)
        data2 = data2.replace('\\[', '[')
        data2 = data2.replace('\\]', ']')
        data2 = data2.replace('\\\\', '\\')
        DataBuffer.__init__(self, name, data2, nl)
        lines = data.split(self.nl)
        self.highlights = {
            'Colortext': ColorHighlighter(),
        }
        self.highlights['Colortext'].highlight(lines)

ABOUT_DATA = '''
[r:d:*]===============================================================================

[y:d:*]************    ********** ******        ****** ****    ********     *********
[y:d:*]**************  ******************     *************   **********   ***********
[y:d:*]*******   ***** ******  *****  ****   ****    ******  ****    **** *****    ***
[y:d:*]  ***       ***   ***    ***    ***  ****      ****  ****           *******
[y:d:*]  ***       ***   ***    ***    ***  ****      ****  ****               ******
[y:d:*]  *****   ***** *****   *****   ****  ****    ******  ****    **** ****    ****
[y:d:*]  ************  *****   *****   ****   *************   **********   **********
[y:d:*]  **********    *****   *****   ****     ****** ****    ********     ********
[y:d:*]  ***
[y:d:*]  ***         [c:d:*]pmacs[d:d:*] is a python-based text editor by [c:d:*]Erik Osheim[d:d:*], [b:d:*](c) 2005-2008
[y:d:*]  ***         [c:d:*]pmacs[d:d:*] is available to you under the [c:d:*]GNU General Public License v2
[y:d:*]*****
[y:d:*]*****         [d:d:*]to view available commands use [c:d:*]C-c M-h [b:d:*](show-bindings-buffer)
[y:d:*]*****         [d:d:*]open files with [c:d:*]C-x C-f[d:d:*]; save with [c:d:*]C-x C-s[d:d:*]; quit with [c:d:*]C-x C-c

[r:d:*]===============================================================================
'''
class AboutBuffer(ColorDataBuffer):
    def __init__(self):
        ColorDataBuffer.__init__(self, '*About*', ABOUT_DATA)