import os, subprocess, re, tempfile
from subprocess import Popen, PIPE, STDOUT

import buffer, default, dirutil, lex, regex, util, window
from point import Point
import buffer.colors
from  method.vc import VcBlame, VcRevView, VcBase, VcException

from method import Method, Argument, arg

if os.system('which git >/dev/null 2>/dev/null') == 0:
    has_git = True
else:
    has_git = False

class GitException(Exception):
    pass

class GitCommit(VcBase):
    '''commit this file's changes'''
    args  = [Argument("msg", type=type(""), prompt="Commit Message: ")]
    regex = re.compile(r'^Committed revision ([0-9]+)\.$')
    def _execute(self, w, **vargs):
        raise GitException("unimplemented")
    
class GitStatus(VcBase):
    _is_method = True
    def _execute(self, w, **vargs):
        path = self._get_path(w)

        cmd = "git status --porcelain %r" % path
        status, data = subprocess.getstatusoutput(cmd)
        status = status >> 8

        if status != 0:
            raise GitException("Problems with 'git status': %d" % status)

        if not data:
            w.set_error("%s  unchanged" % path)
            return

        cx = data[0]
        cy = data[1]
        if cx == ' ':
            w.set_error("%s  working=%s" % (path, cy))
        elif cy == ' ':
            w.set_error("%s  index=%s" % (path, cx))
        else:
            w.set_error("%s  index=%s working=%s" % (path, cx, cy))

        # TODO: handle metadata
        #w.buffer.metadata['git-filename'] = filename
        #w.buffer.metadata['git-status']   = status
        #w.buffer.metadata['git-lrev']     = lrev
        #w.buffer.metadata['git-rrev']     = rrev
        #w.buffer.metadata['git-author']   = lauthor
        #w.buffer.metadata['vc-info']      = '[git:%s/%s]' % (lrev, rrev)

class GitLog(Method):
    '''display the Git log for the current file'''
    _commit_re = re.compile('^(commit) ([0-9a-f]+)$')
    _log_re    = re.compile('^([^ ]+:) (.*)$')
    def _e(self, s):
        return s.replace('\\', '\\\\').replace('[', '\\[').replace(']', '\\]')
    def _em(self, m, i):
        return self._e(m.group(i))
    def _execute(self, w, **vargs):
        cmd          = "git log %r" % w.buffer.path
        status, data = subprocess.getstatusoutput(cmd)
        entries      = []
        for line in data.split('\n'):
            m = self._commit_re.match(line)
            if m:
                entries.append('[b:d:*]commit [y:d:*]' + self._em(m, 2) + "\n")
                continue

            m = self._log_re.match(line)
            if m:
                entries.append('[b:d:*]' + self._em(m, 1) + " [c:d:*]" + self._em(m, 2) + "\n")
                continue

            entries.append(self._e(line) + "\n")
        data2 = ''.join(entries)

        if status == 0 and data:
            w.application.color_data_buffer("*Log*", data2, switch_to=True)
        elif status == 0:
            w.set_error("%s: There was no data" % self.name)
        else:
            w.set_error("%s: There was an error (%s)" % (self.name, status))
        

class GitDiff(Method):
    '''diff the current file with the version in Git'''
    def _execute(self, w, **vargs):
        if not hasattr(w.buffer, 'path'):
            w.set_error("Buffer has no corresponding file")
            return

        cmd = "git diff %r" % w.buffer.path
        status, data = subprocess.getstatusoutput(cmd)

        if status == 0:
            if data:
                w.application.data_buffer("*Diff*", data, switch_to=True, modename='diff')
                w.set_error("Differences were found")
            else:
                w.set_error("No difference found")
        else:
            w.set_error("There was an error (%s)" % (status))

#class GitDiff2(Method):
#    '''diff the current file with the version in SVN'''
#    rev_regex = re.compile('^[0-9]+$')
#    args = [Argument("revision", type=type(""), prompt="Old Revision: ")]
#    def _execute(self, w, **vargs):
#        if not hasattr(w.buffer, 'path'):
#            w.set_error("Buffer has no corresponding file")
#            return
#
#        rev = vargs['revision']
#        if not self.rev_regex.match(rev):
#            w.set_error("Could not parse revision: %r" % rev)
#            return
#
#        cwd = os.getcwd() + os.path.sep
#        path = w.buffer.path
#        if path.startswith(cwd):
#            path = path[len(cwd):]
#
#        cmd = "git diff -r %s %r" % (rev, path)
#        (status, data) = commands.getstatusoutput(cmd)
#        status = status >> 8
#
#        if data:
#            w.application.data_buffer("*Diff*", data, switch_to=True, modename='diff')
#            w.set_error("Differences were found")
#        else:
#            w.set_error("No difference found")
#class GitDiff3(Method):
#    '''diff the current file with the version in SVN'''
#    rev_regex = re.compile('^[0-9]+$')
#    args = [Argument("revision1", type=type(""), prompt="Old Revision: "),
#            Argument("revision2", type=type(""), prompt="New Revision: ")]
#    def _execute(self, w, **vargs):
#        if not hasattr(w.buffer, 'path'):
#            w.set_error("Buffer has no corresponding file")
#            return
#
#        rev1 = vargs['revision1']
#        if not self.rev_regex.match(rev1):
#            w.set_error("Could not parse revision1: %r" % rev)
#            return
#
#        rev2 = vargs['revision2']
#        if not self.rev_regex.match(rev2):
#            w.set_error("Could not parse revision2: %r" % rev)
#            return
#
#        cwd = os.getcwd() + os.path.sep
#        path = w.buffer.path
#        if path.startswith(cwd):
#            path = path[len(cwd):]
#
#        cmd = "git diff -r %s:%s %r" % (rev1, rev2, path)
#        (status, data) = commands.getstatusoutput(cmd)
#        status = status >> 8
#
#        if data:
#            w.application.data_buffer("*Diff*", data, switch_to=True, modename='diff')
#            w.set_error("Differences were found")
#        else:
#            w.set_error("No difference found")

class GitBlame(VcBlame):
    '''show blame output for the current version in Git'''
    # rev, user, date, [time], [timezone], [date-str], content
    num_fields = 3
    #line_re = re.compile(r'^\^*([0-9a-f]+) \(([a-zA-Z0-9_ ]+|Not Committed Yet) +([-0-9]+) [:0-9]+ +[-\+]\d{4} +\d+\) (.*)\n$')
    line_re = re.compile(r'^\^*([0-9a-f]+) +(.*)\((.+) +([-0-9]+) [:0-9]+ +[-\+]\d{4} +\d+\) (.*)\n$')
    prefix_fmt = '[g:d:*]%*s [c:d:*]%-*s [b:d:*]%*s[d:d:*]'
    pretest_err_msg = 'Git is not installed'
    _is_method = True
    def _filter(self, line):
        m = self.line_re.match(line)
        if not m:
            raise VcException("couldn't parse %r" % line)
        groups = m.groups()
        fields = [s.decode('UTF-8') for s in groups[:-1]]
        del fields[1]
        if fields[1] == 'Not Committed Yet':
            fields[1] = ''
        if fields[0] == '00000000':
            fields[0] = ''
        return {'fields': fields, 'content': groups[-1], 'tokens': []}
    def _pretest(self):
        return has_git
    def _open_pipe(self, w, **vargs):
        cmd = ("git", 'blame', w.buffer.path)
        return Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)

class GitBlame2(GitBlame):
    '''show blame output for the specific revision in Git'''
    args = [arg("revision", t=type(""), p="Revision: ", h="revision number")]
    def _open_pipe(self, w, **vargs):
        cmd = ("git", 'blame', vargs['revision'], w.buffer.path)
        return Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)

class GitRevView(VcRevView):
    '''show file contents in Git at revision'''
    args       = [arg("revision", t=type(""), p="Revision: ", h="revision number")]
    namebase   = 'Git'
    _is_method = True
    def _get_cmd(self, w, **vargs):
        path = self._get_path(w, **vargs)
        return ("git", 'show', vargs['revision'] + ':' + path)