from method import Method
from mode import Fundamental

def use_completion_window(app, s, candidates):
    if app.completion_window_is_open():
        w = app.get_completion_window()
        if w.buffer._completion != s:
            app.close_completion_buffer()

    if app.completion_window_is_open():
        w = app.get_completion_window()
        if w.last_is_visible():
            w.goto_beginning()
        else:
            w.page_down()
    elif len(candidates) > 1:
        app.open_completion_buffer(s, sorted(candidates))

class MiniCallback(Method):
    def execute(self, w, **vargs):
        app = w.application
        b   = w.buffer
        if app.completion_window_is_open():
            app.close_completion_buffer()
        s = b.make_string()
        app.arg_history[b.queue][-1] = s
        w.buffer.do_callback()

class MiniTabComplete(Method):
    def execute(self, w, **vargs):
        app = w.application
        b   = w.buffer
        if b.tabber is None:
            w.application.set_error("No tab completion")
            return
        s1 = b.make_string()
        s2, exists, complete = b.tabber.tab_string(s1, w)
        b.set_data(s2)

        candidates = b.tabber.get_candidates(s1, w)
        use_completion_window(app, s2, candidates)

class MiniPrevHistory(Method):
    def execute(self, w, **vargs):
        b = w.buffer
        if b.hindex > 0:
            s = b.make_string()
            b.app.arg_history[b.queue][b.hindex] = s
            b.hindex -= 1
            s = b.app.arg_history[b.queue][b.hindex]
            b.set_data(s)

class MiniNextHistory(Method):
    def execute(self, w, **vargs):
        b = w.buffer
        if b.hindex < len(b.app.arg_history[b.queue]) - 1:
            s = b.make_string()
            b.app.arg_history[b.queue][b.hindex] = s
            b.hindex += 1
            s = b.app.arg_history[b.queue][b.hindex]
            b.set_data(s)

class Mini(Fundamental):
    name      = 'Mini'
    actions   = [MiniCallback, MiniTabComplete, MiniPrevHistory, MiniNextHistory]
    _bindings = {
        'mini-callback': ('RETURN',),
        'mini-tab-complete': ('TAB',),
        'mini-next-history': ('D_ARROW', 'C-n'),
        'mini-prev-history': ('U_ARROW', 'C-p'),
    }

install = Mini.install