from trezor import res, ui, utils
from trezor.messages import ButtonRequestType
from trezor.ui.text import Text
from trezor.utils import chunks


def paginate_lines(lines, lines_per_page=5):
    pages = []
    cpage = []
    nlines = 0
    last_modifier = None
    for line in lines:
        cpage.append(line)
        if not isinstance(line, int):
            nlines += 1
        else:
            last_modifier = line

        if nlines >= lines_per_page:
            pages.append(cpage)
            cpage = []
            nlines = 0
            if last_modifier is not None:
                cpage.append(last_modifier)

    if nlines > 0:
        pages.append(cpage)
    return pages


@ui.layout
async def tx_dialog(
    ctx,
    code,
    content,
    cancel_btn,
    confirm_btn,
    cancel_style,
    confirm_style,
    scroll_tuple=None,
):
    from trezor.messages import MessageType
    from trezor.messages.ButtonRequest import ButtonRequest
    from trezor.ui.confirm import ConfirmDialog
    from trezor.ui.scroll import Scrollpage

    await ctx.call(ButtonRequest(code=code), MessageType.ButtonAck)

    if scroll_tuple and scroll_tuple[1] > 1:
        content = Scrollpage(content, scroll_tuple[0], scroll_tuple[1])

    dialog = ConfirmDialog(
        content,
        cancel=cancel_btn,
        confirm=confirm_btn,
        cancel_style=cancel_style,
        confirm_style=confirm_style,
    )
    return await ctx.wait(dialog)


async def naive_pagination(
    ctx, lines, title, icon=ui.ICON_RESET, icon_color=ui.ORANGE, per_page=5
):
    from trezor.ui.confirm import CANCELLED, CONFIRMED, DEFAULT_CANCEL, DEFAULT_CONFIRM

    if isinstance(lines, (list, tuple)):
        lines = lines
    else:
        lines = list(chunks(lines, 16))

    pages = paginate_lines(lines, per_page)
    npages = len(pages)
    cur_step = 0
    code = ButtonRequestType.SignTx
    iback = res.load(ui.ICON_BACK)
    inext = res.load(ui.ICON_CLICK)

    while cur_step <= npages:
        text = pages[cur_step]
        fst_page = cur_step == 0
        lst_page = cur_step + 1 >= npages

        cancel_btn = DEFAULT_CANCEL if fst_page else iback
        cancel_style = ui.BTN_CANCEL if fst_page else ui.BTN_DEFAULT
        confirm_btn = DEFAULT_CONFIRM if lst_page else inext
        confirm_style = ui.BTN_CONFIRM if lst_page else ui.BTN_DEFAULT

        paging = ("%d/%d" % (cur_step + 1, npages)) if npages > 1 else ""
        content = Text("%s %s" % (title, paging), icon, icon_color=icon_color)
        content.normal(*text)

        reaction = await tx_dialog(
            ctx,
            code,
            content,
            cancel_btn,
            confirm_btn,
            cancel_style,
            confirm_style,
            (cur_step, npages),
        )

        if fst_page and reaction == CANCELLED:
            return False
        elif not lst_page and reaction == CONFIRMED:
            cur_step += 1
        elif lst_page and reaction == CONFIRMED:
            return True
        elif reaction == CANCELLED:
            cur_step -= 1
        elif reaction == CONFIRMED:
            cur_step += 1


def format_amount(value):
    return "%s XMR" % utils.format_amount(value, 12)


def split_address(address):
    return chunks(address, 16)