import commands, dirutil, grp, method, mode, os.path, pwd, re
import util
import buffer, buffer.fs
from window import Window
from lex import Grammar, PatternRule, RegionRule, PatternMatchRule
from point import Point
from method import Method, Argument, arg

class PermGrammar(Grammar):
    rules = [
        PatternRule('sticky', '[tT]'),
        PatternRule('setid', '[sS]'),
        PatternRule('read', 'r'),
        PatternRule('write', 'w'),
        PatternRule('exec', 'x'),
    ]

ds = r'([^ ]+)( +)([^ ]+)( +)([^ ]+)( +)([A-Za-z]{3} [ 0-9]{2} [0-9]{2}:[0-9]{2})( +)([^\n]+)'
class PathGrammar(Grammar):
    rules = [
        RegionRule('perm', '(?<=^.)', PermGrammar, ' '),
        PatternMatchRule('x', ds, 'dir.owner', 'spaces', 'dir.group', 'spaces',
                         'dir.size', 'spaces', 'dir.mtime', 'spaces',
                         'name', 'spaces'),
    ]

class DirGrammar(Grammar):
    rules = [
        RegionRule('dir.file', '^-', PathGrammar, r'\n'),
        RegionRule('dir.blk', '^b', PathGrammar, r'\n'),
        RegionRule('dir.chr', '^c', PathGrammar, r'\n'),
        RegionRule('dir.dir', '^d', PathGrammar, r'\n'),
        RegionRule('dir.lnk', '^l', PathGrammar, r'\n'),
        RegionRule('dir.fifo', '^p', PathGrammar, r'\n'),
        RegionRule('dir.sock', '^s', PathGrammar, r'\n'),
        RegionRule('dir.unk', '^\?', PathGrammar, r'\n'),
    ]

class FsSettingBase(Method):
    msg = 'Settings have changed'
    def _doit(self, w, **vargs): pass
    def _execute(self, w, **vargs):
        self._doit(w, **vargs)
        w.buffer.reload()
        w.goto_beginning()
        w.set_error(self.msg)

class HideDotFiles(FsSettingBase):
    msg = "Dotfiles are hidden"
    def _doit(self, w, **vargs): w.buffer.settings['hide-dot'] = True
class ShowDotFiles(FsSettingBase):
    msg = "Dotfiles are visible"
    def _doit(self, w, **vargs): w.buffer.settings['hide-dot'] = False

class SortType(FsSettingBase):
    msg = "Sorting files by type, name"
    def _doit(self, w, **vargs): w.buffer.settings['type-sort'] = True
class SortName(FsSettingBase):
    msg = "Sorting files by name, type"
    def _doit(self, w, **vargs): w.buffer.settings['type-sort'] = False

class OpenArchive(Method):
    args = [arg('path', dt="path", p="Open Archive: ", h="archive to open")]
    def _execute(self, w, **vargs):
        path = vargs['path']
        a = w.application
        b = a.get_buffer_by_path(path)
        if not b:
            name = a.make_name(os.path.basename(path))
            b = buffer.fs.ArchiveBuffer(path, name)
            b.open()
            Window(b, a, height=0, width=0, mode_name='dir')
            a.add_buffer(b)

        a.methods['switch-buffer'].execute(w, buffername=b.name())
        if b.btype != 'archive': return

        names = [x for x in b.get_names() if x != '.' and x != '..']
        if len(names) == 1:
            path2 = os.path.join(b.path, names[0])
            if os.path.isdir(path2):
                a.methods['open-file'].execute(w, filename=path2)

class DirRefresh(Method):
    def _execute(self, w, **vargs):
        t = None
        try:
            t = dirutil.resolve_token(w)
            s = t.string
        except:
            pass
        w.buffer.reload()
        if t: dirutil.find_name(w, s)
class DirOpen(Method):
    def _execute(self, w, **vargs):
        path = dirutil.resolve_path(w)
        w.set_error("opening %r" % path)
        w.application.methods['open-file'].execute(w, filename=path)
class DirGrep(Method):
    args = [Argument('pattern', datatype="str", prompt="Pattern: ")]
    def _execute(self, w, **vargs):
        cmd = 'grep -rEl "%s" %r' % (vargs['pattern'], w.buffer.path)
        (status, output) = commands.getstatusoutput(cmd)

        paths = []
        suffixes = w.application.config['ignore_suffix']
        for path in output.split('\n'):
            if not path or util.should_ignore_path(path, suffixes):
                continue
            paths.append(path)

        bufname = '*%s*' % self.name.title()
        b = buffer.fs.PathListBuffer(bufname, paths)
        b.modename = 'dir'
        b.open()
        Window(b, w.application, height=0, width=0)
        w.application.add_buffer(b)
        w.application.switch_buffer(b)
        w.set_error("grep exited with %d" % status)

class DirCmd(Method):
    def _make_cmd(self, w, path, **vargs):
        return ''
    def _run(self, w, **vargs):
        basename = dirutil.resolve_name(w)
        path     = os.path.join(w.buffer.path, basename)
        cmd      = self._make_cmd(w, path, **vargs)
        (status, output) = commands.getstatusoutput(cmd)
        if status != 0:
            w.set_error("%s failed (exit %d)" % (self.name, status))
        dirutil.find_name(w, basename)

class DirChmod(DirCmd):
    args        = [Argument('mode', type=type(''), prompt="New Mode: ")]
    octal_re    = re.compile('^[0-7]{1,4}$')
    symbolic_re = re.compile('(?:[ugoa]*(?:[-+=](?:[rwxXst]*|[ugo]))+ *,?)+')
    def _make_cmd(self, w, path, **vargs):
        return 'chmod %r %r' % (vargs['mode'], path)
    def _execute(self, w, **vargs):
        if self.octal_re.match(vargs['mode']):
            pass
        elif self.symbolic_re.match(vargs['mode']):
            pass
        else:
            w.set_error("Not a valid mode: %r" % vargs['mode'])
        self._run(w, **vargs)
class DirChown(DirCmd):
    args = [Argument('owner', type=type(''), prompt="New Owner: ")]
    def _make_cmd(self, w, path, **vargs):
        return 'chown %r %r' % (vargs['owner'], path)
    def _execute(self, w, **vargs):
        fields = vargs['owner'].split(':')
        if len(fields) == 1:
            (owner, group) = (fields[0], None)
        elif len(fields) == 2:
            (owner, group) = fields
        else:
            w.set_error("Malformed 'owner' argument: %r" % vargs['owner'])
            return
        if not dirutil.valid_owner(owner):
            w.set_error('User %r does not exist' % owner)
            return
        if group is not None and not dirutil.valid_group(group):
            w.set_error('Group %r does not exist' % group)
            return
        self._run(w, **vargs)
class DirChgrp(DirCmd):
    args = [Argument('group', type=type(''), prompt="New Group: ")]
    def _make_cmd(self, w, path, **vargs):
        return 'chgrp %r %r' % (vargs['group'], path)
    def _execute(self, w, **vargs):
        if not dirutil.valid_group(vargs['group']):
            w.set_error('Group %r does not exist' % group)
            return
        self._run(w, **vargs)

class DirTouch(Method):
    args = [Argument('filename', datatype="path", prompt="Touch File: ")]
    def _execute(self, w, **vargs):
        basename = vargs['filename']
        path = os.path.join(w.buffer.path, basename)
        retval = os.system('touch %r' % path)
        w.application.methods['dir-refresh'].execute(w, filename=path)
        dirutil.find_name(w, basename)
        if retval != 0:
            w.set_error("touch %r failed (exit %d)" % (path, retval))
class DirRemove(Method):
    def _execute(self, w, **vargs):
        self._old_window = w
        self._old_path   = dirutil.resolve_path(w)
        basename         = os.path.basename(self._old_path)
        self._prompt     = "Do you want to delete %r? " % basename
        w.application.open_mini_buffer(self._prompt, self._callback)
    def _callback(self, v):
        a = self._old_window.application
        if v == 'yes':
            self._doit()
            a.close_mini_buffer()
            return
        if v == 'no':
            a.close_mini_buffer()
            return
        a.open_mini_buffer(self._prompt, self._callback)
        a.set_error('Please type "yes" or "no"')
    def _doit(self):
        w    = self._old_window
        path = self._old_path
        try:
            w.application.methods['previous-line'].execute(w)
            os.remove(path)
            w.set_error("deleted %r " % path)
            w.application.methods['dir-refresh'].execute(w, filename=path)
        except:
            w.set_error("failed to delete %r" % path)

class Dir(mode.Fundamental):
    name    = 'Dir'
    grammar = DirGrammar()
    colors  = {
        'dir.blk.start':  ('cyan', 'default', 'bold'),
        'dir.blk.name':   ('cyan', 'default', 'bold'),
        'dir.chr.start':  ('yellow', 'default', 'bold'),
        'dir.chr.name':   ('yellow', 'default', 'bold'),
        'dir.dir.start':  ('blue', 'default', 'bold'),
        'dir.dir.name':   ('blue', 'default', 'bold'),
        'dir.lnk.start':  ('green', 'default', 'bold'),
        'dir.lnk.name':   ('green', 'default', 'bold'),
        'dir.fifo.start': ('red', 'default', 'bold'),
        'dir.fifo.name':  ('red', 'default', 'bold'),
        'dir.sock.start': ('red', 'default', 'bold'),
        'dir.sock.name':  ('red', 'default', 'bold'),
        'dir.unk.start':  ('magenta', 'default', 'bold'),
        'dir.unk.name':   ('magenta', 'default', 'bold'),

        'perm.setid':  ('yellow', 'default', 'bold'),
        'perm.sticky': ('yellow', 'default', 'bold'),
        'perm.read':   ('magenta', 'default', 'bold'),
        'perm.write':  ('magenta', 'default', 'bold'),
        'perm.exec':   ('magenta', 'default', 'bold'),

        'dir.owner': ('cyan', 'default', 'bold'),
        'dir.group': ('cyan', 'default', 'bold'),
        'dir.size':  ('yellow', 'default', 'bold'),
        'dir.mtime': ('green', 'default', 'bold'),
    }
    actions = [DirRefresh, DirOpen, DirGrep, DirChmod, DirChown, DirChgrp,
               DirTouch, DirRemove, HideDotFiles, ShowDotFiles, SortName,
               SortType,
               OpenArchive]
    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.add_bindings('dir-refresh', ('C-c r',))
        self.add_bindings('dir-open', ('RETURN',))
        self.add_bindings('dir-grep', ('C-c G',))
        self.add_bindings('dir-chmod', ('C-c m',))
        self.add_bindings('dir-chown', ('C-c o',))
        self.add_bindings('dir-chgrp', ('C-c g',))
        self.add_bindings('dir-touch', ('C-c t',))
        self.add_bindings('dir-remove', ('DELETE', 'BACKSPACE', 'C-d'))

install = Dir.install