from micropython import const

from trezor import loop, res, ui
from trezor.ui.button import Button, ButtonCancel, ButtonConfirm, ButtonDefault
from trezor.ui.confirm import CANCELLED, CONFIRMED
from trezor.ui.swipe import SWIPE_DOWN, SWIPE_UP, SWIPE_VERTICAL, Swipe

if __debug__:
    from apps.debug import swipe_signal

if False:
    from typing import Iterable, Sequence


def render_scrollbar(pages: int, page: int) -> None:
    BBOX = const(220)
    SIZE = const(8)

    padding = 14
    if pages * padding > BBOX:
        padding = BBOX // pages

    X = const(220)
    Y = (BBOX // 2) - (pages // 2) * padding

    for i in range(0, pages):
        if i == page:
            fg = ui.FG
        else:
            fg = ui.GREY
        ui.display.bar_radius(X, Y + i * padding, SIZE, SIZE, fg, ui.BG, 4)


def render_swipe_icon() -> None:
    DRAW_DELAY = const(200000)

    icon = res.load(ui.ICON_SWIPE)
    t = ui.pulse(DRAW_DELAY)
    c = ui.blend(ui.GREY, ui.DARK_GREY, t)
    ui.display.icon(70, 205, icon, c, ui.BG)


def render_swipe_text() -> None:
    ui.display.text_center(130, 220, "Swipe", ui.BOLD, ui.GREY, ui.BG)


class Paginated(ui.Layout):
    def __init__(
        self, pages: Sequence[ui.Component], page: int = 0, one_by_one: bool = False
    ):
        self.pages = pages
        self.page = page
        self.one_by_one = one_by_one
        self.repaint = True

    def dispatch(self, event: int, x: int, y: int) -> None:
        pages = self.pages
        page = self.page
        pages[page].dispatch(event, x, y)

        if event is ui.RENDER:
            length = len(pages)
            if page < length - 1:
                render_swipe_icon()
                if self.repaint:
                    render_swipe_text()
            if self.repaint:
                render_scrollbar(length, page)
                self.repaint = False

    async def handle_paging(self) -> None:
        if self.page == 0:
            directions = SWIPE_UP
        elif self.page == len(self.pages) - 1:
            directions = SWIPE_DOWN
        else:
            directions = SWIPE_VERTICAL

        if __debug__:
            swipe = await loop.race(Swipe(directions), swipe_signal())
        else:
            swipe = await Swipe(directions)

        if swipe is SWIPE_UP:
            self.page = min(self.page + 1, len(self.pages) - 1)
        elif swipe is SWIPE_DOWN:
            self.page = max(self.page - 1, 0)

        self.pages[self.page].dispatch(ui.REPAINT, 0, 0)
        self.repaint = True

        self.on_change()

    def create_tasks(self) -> Iterable[loop.Task]:
        return self.handle_input(), self.handle_rendering(), self.handle_paging()

    def on_change(self) -> None:
        if self.one_by_one:
            raise ui.Result(self.page)


class PageWithButtons(ui.Component):
    def __init__(
        self,
        content: ui.Component,
        paginated: "PaginatedWithButtons",
        index: int,
        count: int,
    ) -> None:
        self.content = content
        self.paginated = paginated
        self.index = index
        self.count = count

        # somewhere in the middle, we can go up or down
        left = res.load(ui.ICON_BACK)
        left_style = ButtonDefault
        right = res.load(ui.ICON_CLICK)
        right_style = ButtonDefault

        if self.index == 0:
            # first page, we can cancel or go down
            left = res.load(ui.ICON_CANCEL)
            left_style = ButtonCancel
            right = res.load(ui.ICON_CLICK)
            right_style = ButtonDefault
        elif self.index == count - 1:
            # last page, we can go up or confirm
            left = res.load(ui.ICON_BACK)
            left_style = ButtonDefault
            right = res.load(ui.ICON_CONFIRM)
            right_style = ButtonConfirm

        self.left = Button(ui.grid(8, n_x=2), left, left_style)
        self.left.on_click = self.on_left  # type: ignore

        self.right = Button(ui.grid(9, n_x=2), right, right_style)
        self.right.on_click = self.on_right  # type: ignore

    def dispatch(self, event: int, x: int, y: int) -> None:
        self.content.dispatch(event, x, y)
        self.left.dispatch(event, x, y)
        self.right.dispatch(event, x, y)

    def on_left(self) -> None:
        if self.index == 0:
            self.paginated.on_cancel()
        else:
            self.paginated.on_up()

    def on_right(self) -> None:
        if self.index == self.count - 1:
            self.paginated.on_confirm()
        else:
            self.paginated.on_down()


class PaginatedWithButtons(ui.Layout):
    def __init__(
        self, pages: Sequence[ui.Component], page: int = 0, one_by_one: bool = False
    ) -> None:
        self.pages = [
            PageWithButtons(p, self, i, len(pages)) for i, p in enumerate(pages)
        ]
        self.page = page
        self.one_by_one = one_by_one

    def dispatch(self, event: int, x: int, y: int) -> None:
        pages = self.pages
        page = self.page
        pages[page].dispatch(event, x, y)
        if event is ui.RENDER:
            render_scrollbar(len(pages), page)

    def on_up(self) -> None:
        self.page = max(self.page - 1, 0)
        self.pages[self.page].dispatch(ui.REPAINT, 0, 0)
        self.on_change()

    def on_down(self) -> None:
        self.page = min(self.page + 1, len(self.pages) - 1)
        self.pages[self.page].dispatch(ui.REPAINT, 0, 0)
        self.on_change()

    def on_confirm(self) -> None:
        raise ui.Result(CONFIRMED)

    def on_cancel(self) -> None:
        raise ui.Result(CANCELLED)

    def on_change(self) -> None:
        if self.one_by_one:
            raise ui.Result(self.page)