from copy import copy
from visidata import vd, options, VisiData, ListOfDictSheet, ENTER, CompleteKey, ReturnValue


vd.option('fancy_chooser', False, 'a nicer selection interface for aggregators and jointype')

@VisiData.api
def chooseOne(vd, choices, type=''):
    'Return one user-selected key from *choices*.'
    return vd.choose(choices, 1, type=type)


@VisiData.api
def choose(vd, choices, n=None, type=''):
    'Return a list of 1 to *n* "key" from elements of *choices* (see chooseMany).'
    ret = vd.chooseMany(choices, type=type) or vd.fail('no choice made')
    if n and len(ret) > n:
        vd.fail('can only choose %s' % n)
    return ret[0] if n==1 else ret


class ChoiceSheet(ListOfDictSheet):
    rowtype = 'choices'  # rowdef = dict
    precious = False
    def makeChoice(self, rows):
        # selected rows by their keys, separated by spaces
        raise ReturnValue([r['key'] for r in rows])

@VisiData.api
def chooseFancy(vd, choices):
        vs = ChoiceSheet('choices', source=copy(choices))
        options.set('disp_splitwin_pct', -75, vs)
        vs.reload()
        vs.setKeys([vs.column('key')])
        vd.push(vs)
        chosen = vd.runresult()
        vd.remove(vs)
        return chosen


@VisiData.api
def chooseMany(vd, choices, type=''):
    '''Return a list of 1 or more keys from *choices*, which is a list of
    dicts. Each element dict must have a unique "key", which must be typed
    directly by the user in non-fancy mode (therefore no spaces).  All other
    items in the dicts are also shown in fancy chooser mode.  Use previous
    choices from the replay input if available.  Add chosen keys
    (space-separated) to the cmdlog as input for the current command.'''
    if vd.cmdlog:
        v = vd.getLastArgs()
        if v is not None:
            # check that each key in v is in choices?
            vd.setLastArgs(v)
            return v.split()

    if options.fancy_chooser:
        chosen = vd.chooseFancy(choices)
    else:
        chosen = []
        choice_keys = [c['key'] for c in choices]
        prompt='choose any of %d options (Ctrl+X for menu)' % len(choice_keys)
        try:
            def throw_fancy(v, i):
                ret = vd.chooseFancy(choices)
                if ret:
                    raise ReturnValue(ret)
                return v, i
            chosenstr = vd.input(prompt+': ', completer=CompleteKey(choice_keys), bindings={'^X': throw_fancy}, type=type)
            for c in chosenstr.split():
                if c in choice_keys:
                    chosen.append(c)
                else:
                    vd.warning('invalid choice "%s"' % c)
        except ReturnValue as e:
            chosen = e.args[0]

    if vd.cmdlog:
        vd.setLastArgs(' '.join(chosen))

    return chosen


ChoiceSheet.addCommand(ENTER, 'choose-rows', 'makeChoice([cursorRow])')
ChoiceSheet.addCommand('g'+ENTER, 'choose-rows-selected', 'makeChoice(onlySelectedRows)')
