import code, re, string, StringIO, sys, traceback
import buffer, color, completer, lex, method, mode, mode.mini, mode.consolemini, window
from subprocess import Popen, PIPE, STDOUT
from mode.perl import PerlGrammar
from point import Point

PAD   = '   '
LIMIT = 79

class IperlExec(method.Method):
    def _execute(self, w, **vargs):
        if w.application.completion_window_is_open():
            w.application.close_completion_buffer()
        s = w.buffer.make_string()
        w.mode.history[-1] = s
        w.mode.history.append('')
        w.buffer.set_data('')
        w.mode.hindex = len(w.mode.history) - 1

        a = w.application
        b = w.mode._get_iperl()
        if a.window().buffer is not b:
            a.switch_buffer(b)
        p = a.get_mini_buffer_prompt()
        b.insert_string(b.get_buffer_end(), p + s + '\n', force=True)

        b.pipe.stdin.write("ENTER:%s\n" % s)
        b.pipe.stdin.flush()
        output = w.mode._read()
        b.insert_string(b.get_buffer_end(), output, force=True)

class IperlTab(method.Method):
    def execute(self, w, **vargs):
        a = w.application
        s = w.buffer.make_string()
        b = w.mode._get_iperl()

        x2 = w.logical_cursor().x
        if not s or s[:x2].isspace():
            w.insert_string_at_cursor(' ' * w.mode.tabwidth)
            return

        r = re.compile('^[a-zA-Z0-9_:$@*&%]$')
        line = s
        x1 = x2
        while x1 > 0 and r.match(s[x1 - 1]):
            x1 -= 1
        word = line[x1:x2]

        b.pipe.stdin.write("COMPLETE:%d:%d:%s\n" % (x1, x2, s))
        b.pipe.stdin.flush()
        (typ_, value) = w.mode._readline()
        assert typ_ == 'COMPLETIONS', '%r %r' % (typ_, value)

        candidates = [x for x in value.split('|') if x]
        w.mode._read()

        if candidates:
            s = completer.find_common_string(candidates)
            w.buffer.delete(Point(x1, 0), Point(x2, 0), force=True)
            w.insert_string_at_cursor(s)
            mode.mini.use_completion_window(a, s, candidates)

class IperlPathStart(method.Method):
    '''Interactively run perl statements in the context of a buffer'''
    def _start(self, w, parent):
        a = w.application
        if w.buffer.btype == 'iperl':
            b = w.buffer
        else:
            name = buffer.IperlBuffer.create_name(parent)
            if not a.has_buffer_name(name):
                b = buffer.IperlBuffer(parent, a)
                a.add_buffer(b)
                window.Window(b, a)
            else:
                b = a.get_buffer_by_name(name)
        self.main_buffer = b
        if a.window().buffer is not b:
            a.switch_buffer(b)
        f = lambda x: None
        w.application.open_mini_buffer('*** ', f, self, None, 'iperlmini')
    def execute(self, w, **vargs):
        self._start(w, w.buffer)

class IperlStart(IperlPathStart):
    '''Interactively run perl statements'''
    def execute(self, w, **vargs):
        self._start(w, None)

class IperlPageUp(mode.consolemini.ConsolePageUp):
    subbuf = '*IPerl*'
class IperlPageDown(mode.consolemini.ConsolePageDown):
    subbuf = '*IPerl*'
class IperlGotoBeginning(mode.consolemini.ConsoleGotoBeginning):
    subbuf = '*IPerl*'
class IperlGotoEnd(mode.consolemini.ConsoleGotoEnd):
    subbuf = '*IPerl*'

class IperlMini(mode.Fundamental):
    modename = 'IperlMini'
    actions  = [IperlExec, IperlTab, IperlStart, IperlPathStart,
                IperlPageUp, IperlPageDown, IperlGotoBeginning, IperlGotoEnd]
    readre = re.compile('^([A-Z]+):(.*)\n$')
    def _readline(self):
        b = self._get_iperl()
        line = b.pipe.stdout.readline()
        m = self.readre.match(line)
        if m:
            return (m.group(1), m.group(2))
        else:
            return ('RAW', line.rstrip())
    def _read(self):
        b = self._get_iperl()
        output = []
        while True:
            (type_, value) = self._readline()
            if type_ == 'PROMPT':
                b.prompt = value.strip() + ' '
                self.window.application.set_mini_buffer_prompt(b.prompt)
                break
            value.rstrip()
            if value:
                output.append(value)
        if output:
            return '\n'.join(output) + '\n'
        else:
            return ''

    def _get_iperl(self):
        a = self.window.application
        if not a.has_buffer_name('*IPerl*'):
            b = buffer.IperlBuffer(None)
            a.add_buffer(b)
            window.Window(b, a)
        else:
            b = a.bufferlist.get_buffer_by_name('*IPerl*')
        return b

    def __init__(self, w):
        mode.Fundamental.__init__(self, w)
        self.history = ['']
        self.hindex  = 0
        b = self._get_iperl()
        w.application.set_mini_buffer_prompt(b.prompt)
        self.add_bindings('iperl-exec', ('RETURN',))
        self.add_bindings('console-clear', ('C-l',))
        self.add_bindings('console-cancel', ('C-]',))
        self.add_bindings('console-history-prev', ('C-p', 'UP'))
        self.add_bindings('console-history-next', ('C-n', 'DOWN'))
        self.add_bindings('iperl-tab', ('TAB',))
        self.add_bindings('iperl-page-up', ('M-v',))
        self.add_bindings('iperl-page-down', ('C-v',))
        self.add_bindings('iperl-goto-beginning', ('M-<',))
        self.add_bindings('iperl-goto-end', ('M->',))
        for c in string.letters + string.digits + string.punctuation:
            self.add_binding('insert-string-%s' % c, c)

install = IperlMini.install