dear-imgui-rs 0.14.0

use crate::Condition;
use crate::sys;
use crate::ui::Ui;

use super::{TreeNodeFlags, TreeNodeId, TreeNodeToken};

/// Builder for a tree node widget
#[derive(Clone, Debug)]
#[must_use]
pub struct TreeNode<'a, T, L = &'static str> {
    id: TreeNodeId<T>,
    label: Option<L>,
    opened: bool,
    opened_cond: Option<Condition>,
    flags: TreeNodeFlags,
    ui: &'a Ui,
}

impl<'a, T: AsRef<str>> TreeNode<'a, T, &'static str> {
    pub(super) fn new(id: TreeNodeId<T>, ui: &'a Ui) -> Self {
        TreeNode {
            id,
            label: None,
            opened: false,
            opened_cond: None,
            flags: TreeNodeFlags::NONE,
            ui,
        }
    }

    /// Sets a custom label for the tree node
    pub fn label<L: AsRef<str>>(self, label: L) -> TreeNode<'a, T, L> {
        TreeNode {
            id: self.id,
            label: Some(label),
            opened: self.opened,
            opened_cond: self.opened_cond,
            flags: self.flags,
            ui: self.ui,
        }
    }
}

impl<'a, T: AsRef<str>, L: AsRef<str>> TreeNode<'a, T, L> {
    /// Sets the opened state
    pub fn opened(mut self, opened: bool, cond: Condition) -> Self {
        self.opened = opened;
        self.opened_cond = Some(cond);
        self
    }

    /// Draw as selected
    pub fn selected(mut self, selected: bool) -> Self {
        self.flags.set(TreeNodeFlags::SELECTED, selected);
        self
    }

    /// Draw frame with background (e.g. for CollapsingHeader)
    pub fn framed(mut self, framed: bool) -> Self {
        self.flags.set(TreeNodeFlags::FRAMED, framed);
        self
    }

    /// Hit testing to allow subsequent widgets to overlap this one
    pub fn allow_item_overlap(mut self, allow: bool) -> Self {
        self.flags.set(TreeNodeFlags::ALLOW_ITEM_OVERLAP, allow);
        self
    }

    /// Don't do a TreePush() when open (e.g. for CollapsingHeader)
    pub fn no_tree_push_on_open(mut self, no_push: bool) -> Self {
        self.flags.set(TreeNodeFlags::NO_TREE_PUSH_ON_OPEN, no_push);
        self
    }

    /// Don't automatically and temporarily open node when Logging is active
    pub fn no_auto_open_on_log(mut self, no_auto: bool) -> Self {
        self.flags.set(TreeNodeFlags::NO_AUTO_OPEN_ON_LOG, no_auto);
        self
    }

    /// Default node to be open
    pub fn default_open(mut self, default_open: bool) -> Self {
        self.flags.set(TreeNodeFlags::DEFAULT_OPEN, default_open);
        self
    }

    /// Need double-click to open node
    pub fn open_on_double_click(mut self, double_click: bool) -> Self {
        self.flags
            .set(TreeNodeFlags::OPEN_ON_DOUBLE_CLICK, double_click);
        self
    }

    /// Only open when clicking on the arrow part
    pub fn open_on_arrow(mut self, arrow_only: bool) -> Self {
        self.flags.set(TreeNodeFlags::OPEN_ON_ARROW, arrow_only);
        self
    }

    /// No collapsing, no arrow (use as a convenience for leaf nodes)
    pub fn leaf(mut self, leaf: bool) -> Self {
        self.flags.set(TreeNodeFlags::LEAF, leaf);
        self
    }

    /// Display a bullet instead of arrow
    pub fn bullet(mut self, bullet: bool) -> Self {
        self.flags.set(TreeNodeFlags::BULLET, bullet);
        self
    }

    /// Use FramePadding to vertically align text baseline to regular widget height
    pub fn frame_padding(mut self, frame_padding: bool) -> Self {
        self.flags.set(TreeNodeFlags::FRAME_PADDING, frame_padding);
        self
    }

    /// Extend hit box to the right-most edge
    pub fn span_avail_width(mut self, span: bool) -> Self {
        self.flags.set(TreeNodeFlags::SPAN_AVAIL_WIDTH, span);
        self
    }

    /// Extend hit box to the left-most and right-most edges
    pub fn span_full_width(mut self, span: bool) -> Self {
        self.flags.set(TreeNodeFlags::SPAN_FULL_WIDTH, span);
        self
    }

    /// Left direction may move to this tree node from any of its child
    pub fn nav_left_jumps_back_here(mut self, nav: bool) -> Self {
        self.flags.set(TreeNodeFlags::NAV_LEFT_JUMPS_BACK_HERE, nav);
        self
    }

    /// Pushes a tree node and starts appending to it.
    ///
    /// Returns `Some(TreeNodeToken)` if the tree node is open. After content has been
    /// rendered, the token can be popped by calling `.pop()`.
    ///
    /// Returns `None` if the tree node is not open and no content should be rendered.
    pub fn push(self) -> Option<TreeNodeToken<'a>> {
        let open = unsafe {
            if let Some(opened_cond) = self.opened_cond {
                sys::igSetNextItemOpen(self.opened, opened_cond as i32);
            }

            match &self.id {
                TreeNodeId::Str(s) => {
                    if let Some(label) = self.label.as_ref() {
                        let (id_ptr, label_ptr) = self.ui.scratch_txt_two(s, label);
                        sys::igPushID_Str(id_ptr);
                        let open = sys::igTreeNodeEx_Str(label_ptr, self.flags.bits());
                        sys::igPopID();
                        open
                    } else {
                        let label_ptr = self.ui.scratch_txt(s);
                        sys::igTreeNodeEx_Str(label_ptr, self.flags.bits())
                    }
                }
                TreeNodeId::Ptr(ptr) => {
                    let label = self.label.as_ref().map_or("", |l| l.as_ref());
                    let label_ptr = self.ui.scratch_txt(label);
                    sys::igPushID_Ptr(*ptr as *const std::os::raw::c_void);
                    let open = sys::igTreeNodeEx_Str(label_ptr, self.flags.bits());
                    sys::igPopID();
                    open
                }
                TreeNodeId::Int(i) => {
                    let label = self.label.as_ref().map_or("", |l| l.as_ref());
                    let label_ptr = self.ui.scratch_txt(label);
                    sys::igPushID_Int(*i);
                    let open = sys::igTreeNodeEx_Str(label_ptr, self.flags.bits());
                    sys::igPopID();
                    open
                }
            }
        };

        if open {
            Some(TreeNodeToken::new(self.ui))
        } else {
            None
        }
    }
}