from tpers import TPrs
import ansi
# probably reinventing the wheel :/
class Rgseq(TPrs):
    def InitPersistent(self, *rgseq):
        self.rgseq = rgseq
    def __len__(self):
        return sum([len(seq) for seq in self.rgseq])

    def __getitem__(self, i):
        c = 0
        for seq in self.rgseq:
            cSeq = len(seq)
            if i < c + cSeq:
                return seq[i - c]
            c = c + cSeq
        raise IndexError

    def index(self, o):
        c = 0
        for seq in self.rgseq:
            try:
                iSeq = seq.index(o)
                return iSeq + c
            except ValueError:
                c = c + len(seq)
        raise ValueError

class Snippet(object):
    def __init__(self, st, ichStart, ichLim):
        self.st = st
        self.ichStart = ichStart
        self.ichLim = ichLim

def RgstWrapped(st, w, fForEditing = False, dxStart = 0):
    return [snippet.st for snippet in RgSnippetWrapped(st, w, fForEditing, dxStart)]

def RgSnippetWrapped(st, w, fForEditing = False, xStart = 0):
    ichWrap = -1
    ichStart = 0
    for ich, ch in enumerate(st):
        if not fForEditing and ch == ' ':
            ichWrap = ich
        if ich == ichStart + w - xStart:
            ichStartNew = ichWrap + 1
            if ichWrap < 0:
                ichWrap = ich
                ichStartNew = ich
            elif fForEditing: # don't swallow spaces
                ichWrap = ichStartNew
            yield Snippet(st[ichStart:ichWrap], ichStart, ichStartNew)
            ichStart = ichStartNew
            ichWrap = -1
            xStart = 0
        if fForEditing and ch == ' ':
            ichWrap = ich

    if ichStart < len(st) or ichStart == 0:
        yield Snippet(st[ichStart:], ichStart, len(st))

# selection helpers
def IoInc(rgo, io, fnSelectable, fRebound = True):
    io = io + 1
    while io < len(rgo) and not fnSelectable(rgo[io]):
        io = io + 1
    if io >= len(rgo) or not fnSelectable(rgo[io]):
        if fRebound:
            return IoDec(rgo, io, fnSelectable, False)
        return -1
    return io

def IoDec(rgo, io, fnSelectable, fRebound = True):
    io = io - 1
    while io > 0 and not fnSelectable(rgo[io]):
        io = io - 1
    if io < 0 or not fnSelectable(rgo[io]):
        if fRebound:
            return IoInc(rgo, io, fnSelectable, False)
        return -1
    return io

class Stedit(TPrs):
    def InitPersistent(self, dgEnter = None, stInitial = ""):
        self.dgEnter = dgEnter
        self.SetValue(stInitial)
    def SetValue(self, st):
        self.st = st
        self.ich = len(st)
    def GetValue(self):
        return self.st
    def StForSize(self, fSel = True):
        if fSel and self.ich == len(self.st):
            return self.st + "_"
        return self.st

    def HandleKey(self, key):
        if key == ansi.K_LEFT and self.ich > 0:
            self.ich = self.ich - 1
        elif key == ansi.K_RIGHT and self.ich < len(self.st):
            self.ich = self.ich + 1
        elif key == ansi.K_BACKSPACE and self.ich > 0:
            self.st = self.st[:self.ich - 1] + self.st[self.ich:]
            self.ich = self.ich - 1
        elif key == ansi.K_DEL and self.ich < len(self.st):
            self.st = self.st[:self.ich] + self.st[self.ich + 1:]
        elif key == ansi.K_HOME:
            self.ich = 0
        elif key == ansi.K_END:
            self.ich = len(self.st)
        elif ansi.FKeyPrintable(key):
            self.st = self.st[:self.ich] + key + self.st[self.ich:]
            self.ich = self.ich + 1
        elif ansi.FEnter(key) and self.dgEnter != None:
            if not self.dgEnter(self.st):
                self.st = ""
                self.ich = 0
        else:
            return False
        return True
    
    def DrawCursor(self, ascr, x, y, colFg, colBg, snippet):
        if self.ich >= snippet.ichStart and (snippet.ichLim < 0 or self.ich < snippet.ichLim):
            if self.ich == len(self.st):
                ch = ' '
            else:
                ch = self.st[self.ich]
            ascr.PutAch(ansi.MkAch(ch, colFg, colBg), x + self.ich - snippet.ichStart, y)