import method, mode2, os.path
from lex3 import Grammar, PatternRule, RegionRule, PatternGroupRule
from point2 import Point
from method import Method, Argument

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

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

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

class Dir(mode2.Fundamental):
    grammar = DirGrammar()
    colors = {
        'blk.start': ('cyan', 'default'),
        'blk.name': ('cyan', 'default'),
        'chr.start': ('yellow', 'default'),
        'chr.name': ('yellow', 'default'),
        'dir.start': ('blue', 'default'),
        'dir.name': ('blue', 'default'),
        'lnk.start': ('green', 'default'),
        'lnk.name': ('green', 'default'),
        'fifo.start': ('red', 'default'),
        'fifo.name': ('red', 'default'),
        'sock.start': ('red', 'default'),
        'sock.name': ('red', 'default'),
        'unk.start': ('magenta', 'default'),
        'unk.name': ('magenta', 'default'),

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

        #'owner':      ('blue', 'default'),
        'owner':      ('cyan', 'default'),
        'group':      ('cyan', 'default'),
        'size':       ('yellow', 'default'),
        'mtime':      ('green', 'default'),
    }
    def __init__(self, w):
        mode2.Fundamental.__init__(self, w)
        self.add_action(Chmod())
        self.add_action(Chown())
        self.add_action(Chgrp())

        self.add_action(TouchPath())
        self.add_action(RefreshView())
        self.add_action_and_bindings(OpenPath(), ('RETURN',))
        self.add_action_and_bindings(RemovePath(), ('DELETE', 'BACKSPACE', 'C-d'))
    def name(self):
        return "Dir"

def _resolve_token(w):
    c = w.logical_cursor()
    p = Point(0, c.y)
    return w.get_next_token_by_type(p, 'name')
def _resolve_path(w):
    t = _resolve_token(w)
    path = os.path.join(w.buffer.path, t.string)
    return path

class Chmod(Method):
    def _execute(self, w, **vargs):
        w.set_error('chmod not implemented')
class Chown(Method):
    def _execute(self, w, **vargs):
        w.set_error('chown not implemented')
class Chgrp(Method):
    def _execute(self, w, **vargs):
        w.set_error('chgrp not implemented')

class TouchPath(Method):
    args = [Argument('filename', datatype="path", prompt="Touch File: ")]
    def _execute(self, w, **vargs):
        path = vargs['filename']
        retval = os.system('touch %r' % path)
        w.application.methods['refresh-view'].execute(w, filename=path)
        if retval != 0:
            w.set_error("touch failed with exit status %d" % retval)
class RemovePath(Method):
    def _execute(self, w, **vargs):
        path = _resolve_path(w)
        w.application.methods['previous-line'].execute(w)
        try:
            os.remove(path)
            w.set_error("deleted %r " % path)
            w.application.methods['refresh-view'].execute(w, filename=path)
        except:
            w.set_error("failed to delete %r" % path)
class OpenPath(Method):
    def _execute(self, w, **vargs):
        path = _resolve_path(w)
        w.set_error("opening %r" % path)
        w.application.methods['open-file'].execute(w, filename=path)
class RefreshView(Method):
    def _execute(self, w, **vargs):
        c = w.logical_cursor()
        t = _resolve_token(w)
        s = t.string
        w.buffer.reload()
        w.goto(Point(c.x, 0))
        found = False
        while not found and w.cursor.y < len(w.buffer.lines):
            t = _resolve_token(w)
            if t.string == s:
                found = True
            else:
                w.goto(Point(c.x, w.cursor.y + 1))
        if not found:
            w.goto(Point(0, 0))