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use std::marker::PhantomData;
use std::ptr;

use crate::sys;
use crate::window::WindowFlags;
use crate::{ImStr, Ui};

/// Created by call to [`Ui::popup_modal`].
#[must_use]
pub struct PopupModal<'ui, 'p> {
    label: &'p ImStr,
    opened: Option<&'p mut bool>,
    flags: WindowFlags,
    _phantom: PhantomData<&'ui Ui<'ui>>,
}

impl<'ui, 'p> PopupModal<'ui, 'p> {
    pub fn new(_: &Ui<'ui>, label: &'p ImStr) -> Self {
        PopupModal {
            label,
            opened: None,
            flags: WindowFlags::empty(),
            _phantom: PhantomData,
        }
    }
    /// Pass a mutable boolean which will be updated to refer to the current
    /// "open" state of the modal.
    pub fn opened(mut self, opened: &'p mut bool) -> Self {
        self.opened = Some(opened);
        self
    }
    pub fn flags(mut self, flags: WindowFlags) -> Self {
        self.flags = flags;
        self
    }
    pub fn title_bar(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_TITLE_BAR, !value);
        self
    }
    pub fn resizable(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_RESIZE, !value);
        self
    }
    pub fn movable(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_MOVE, !value);
        self
    }
    pub fn scroll_bar(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_SCROLLBAR, !value);
        self
    }
    pub fn scrollable(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_SCROLL_WITH_MOUSE, !value);
        self
    }
    pub fn collapsible(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_COLLAPSE, !value);
        self
    }
    pub fn always_auto_resize(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::ALWAYS_AUTO_RESIZE, value);
        self
    }
    pub fn save_settings(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_SAVED_SETTINGS, !value);
        self
    }
    pub fn inputs(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_INPUTS, !value);
        self
    }
    pub fn menu_bar(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::MENU_BAR, value);
        self
    }
    pub fn horizontal_scrollbar(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::HORIZONTAL_SCROLLBAR, value);
        self
    }
    pub fn no_focus_on_appearing(mut self, value: bool) -> Self {
        self.flags.set(WindowFlags::NO_FOCUS_ON_APPEARING, value);
        self
    }
    pub fn no_bring_to_front_on_focus(mut self, value: bool) -> Self {
        self.flags
            .set(WindowFlags::NO_BRING_TO_FRONT_ON_FOCUS, value);
        self
    }
    pub fn always_vertical_scrollbar(mut self, value: bool) -> Self {
        self.flags
            .set(WindowFlags::ALWAYS_VERTICAL_SCROLLBAR, value);
        self
    }
    pub fn always_horizontal_scrollbar(mut self, value: bool) -> Self {
        self.flags
            .set(WindowFlags::ALWAYS_HORIZONTAL_SCROLLBAR, value);
        self
    }
    pub fn always_use_window_padding(mut self, value: bool) -> Self {
        self.flags
            .set(WindowFlags::ALWAYS_USE_WINDOW_PADDING, value);
        self
    }
    /// Consume and draw the PopupModal.
    pub fn build<F: FnOnce()>(self, f: F) {
        let render = unsafe {
            sys::igBeginPopupModal(
                self.label.as_ptr(),
                self.opened
                    .map(|x| x as *mut bool)
                    .unwrap_or(ptr::null_mut()),
                self.flags.bits() as i32,
            )
        };
        if render {
            f();
            unsafe { sys::igEndPopup() };
        }
    }
}