Collapsible

// SPDX-FileCopyrightText: 2026 Proa Labs, Inc.
// SPDX-License-Identifier: MIT OR Apache-2.0

//! Collapsible component implementations
//!
//! SSR markup for collapsible disclosure widgets. The JavaScript hydration
//! handles the expand/collapse behavior.
use super::recipe::{CollapsibleRecipeProps, COLLAPSIBLE_RECIPE};
use super::COLLAPSIBLE_ANATOMY;
use crate::DisclosureState;
use proa_core::{WebContext, WebRenderSync, WriteBuf};
use proa_macros::html_sync;
/// Collapsible root component - wraps trigger and content
///
/// Renders a container div with data attributes for JS hydration.
/// The `open` field controls the initial state.
///
/// # Example
///
/// ```ignore
/// use proa_ui::{Collapsible, CollapsibleTrigger, CollapsibleContent};
/// use proa_macros::html_sync;
///
/// html_sync! {
///     {Collapsible {
///         open: false,
///         children: Some(html_sync! {
///             {CollapsibleTrigger {
///                 children: Some("Toggle"),
///                 ..Default::default()
///             }}
///             {CollapsibleContent {
///                 children: Some("Hidden content"),
///                 ..Default::default()
///             }}
///         }),
///         ..Default::default()
///     }}
/// }
/// ```
pub struct Collapsible<C = ()> {
    /// Initial open/closed state
    pub open: bool,
    /// Whether the collapsible is disabled
    pub disabled: bool,
    /// Additional CSS classes
    pub class: Option<&'static str>,
    /// Optional id attribute
    pub id: Option<&'static str>,
    /// Child elements (trigger + content)
    pub children: Option<C>,
}
impl Collapsible<()> {
    pub const fn new() -> Self {
        Self {
            open: false,
            disabled: false,
            class: None,
            id: None,
            children: None,
        }
    }
}
impl<C> Default for Collapsible<C> {
    fn default() -> Self {
        Self {
            open: false,
            disabled: false,
            class: None,
            id: None,
            children: None,
        }
    }
}
impl<B: WriteBuf, C: WebRenderSync<L, B>, L: ::proa_core::DataLoader> WebRenderSync<L, B>
    for Collapsible<C>
{
    fn render(
        self,
        cx: &mut WebContext<L, B>,
    ) -> Result<(), proa_core::shared::write_buf::WriteError> {
        let style = COLLAPSIBLE_RECIPE.resolve(CollapsibleRecipeProps);
        let state = DisclosureState::from_open(self.open);
        let disabled = if self.disabled { "true" } else { "false" };
        let initial_display = if state.hidden() { "none" } else { "block" };
        html_sync! {
            <div
                data-collapsible
                data-collapsible-root
                data-scope={COLLAPSIBLE_ANATOMY.scope()}
                data-part="root"
                data-slot="collapsible"
                data-state={state}
                data-disabled={disabled}
                data-collapsible-id={self.id}
                id={self.id}
                class={proa_macros::text!("{} {}", style, self.class)}
                style={proa_core::style_ok(proa_macros::text!(
                    "--proa-collapsible-display: {};",
                    initial_display
                ))}
            >
                {self.children}
            </div>
        }
        .render(cx)
    }
}
/// CollapsibleTrigger - button that toggles the collapsible content
///
/// Renders a `<button>` element with `data-collapsible-trigger` for JS hydration.
pub struct CollapsibleTrigger<C = ()> {
    /// Additional CSS classes
    pub class: Option<&'static str>,
    /// Trigger content (usually text or an icon)
    pub children: Option<C>,
}
impl<C> Default for CollapsibleTrigger<C> {
    fn default() -> Self {
        Self {
            class: None,
            children: None,
        }
    }
}
impl<B: WriteBuf, C: WebRenderSync<L, B>, L: ::proa_core::DataLoader> WebRenderSync<L, B>
    for CollapsibleTrigger<C>
{
    fn render(
        self,
        cx: &mut WebContext<L, B>,
    ) -> Result<(), proa_core::shared::write_buf::WriteError> {
        html_sync! {
            <button
                type="button"
                data-collapsible-trigger
                data-scope={COLLAPSIBLE_ANATOMY.scope()}
                data-part="trigger"
                data-slot="collapsible-trigger"
                class={proa_macros::text!("{} {}", COLLAPSIBLE_RECIPE.trigger, self.class)}
            >
                {self.children}
            </button>
        }
        .render(cx)
    }
}
/// CollapsibleContent - the content area that is shown/hidden
///
/// The root owns the initial open state. Its inherited display variable makes
/// the first SSR frame truthful; the delegated runtime then projects state and
/// ARIA attributes onto this part.
pub struct CollapsibleContent<C = ()> {
    /// Additional CSS classes
    pub class: Option<&'static str>,
    /// The collapsible content
    pub children: Option<C>,
}
impl<C> Default for CollapsibleContent<C> {
    fn default() -> Self {
        Self {
            class: None,
            children: None,
        }
    }
}
impl<B: WriteBuf, C: WebRenderSync<L, B>, L: ::proa_core::DataLoader> WebRenderSync<L, B>
    for CollapsibleContent<C>
{
    fn render(
        self,
        cx: &mut WebContext<L, B>,
    ) -> Result<(), proa_core::shared::write_buf::WriteError> {
        html_sync! {
            <div
                data-collapsible-content
                data-scope={COLLAPSIBLE_ANATOMY.scope()}
                data-part="content"
                data-slot="collapsible-content"
                class={proa_macros::text!("{} {}", COLLAPSIBLE_RECIPE.content, self.class)}
                style="display: var(--proa-collapsible-display, none);"
            >
                {self.children}
            </div>
        }
        .render(cx)
    }
}
#[cfg(test)]
mod tests {
    use super::*;
    use proa_core::ctx::Ctx;
    use proa_core::text::text;
    #[test]
    fn collapsible_renders_with_data_attributes() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            open: false,
            disabled: false,
            class: None,
            id: None,
            children: Some(text("Content")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("data-slot=\"collapsible\""));
        assert!(html.contains("data-scope=\"collapsible\""));
        assert!(html.contains("data-part=\"root\""));
        assert!(html.contains("data-collapsible-root"));
        assert!(html.contains("data-state=\"closed\""));
        assert!(html.contains("data-disabled=\"false\""));
        assert!(html.contains("Content"));
    }
    #[test]
    fn collapsible_renders_open_state() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            open: true,
            children: Some(text("Open content")),
            ..Default::default()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("data-state=\"open\""));
    }
    #[test]
    fn collapsible_renders_disabled_state() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            disabled: true,
            children: Some(text("Disabled")),
            ..Default::default()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("data-disabled=\"true\""));
    }
    #[test]
    fn collapsible_renders_with_id() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            id: Some("my-collapsible"),
            children: Some(text("Content")),
            ..Default::default()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("id=\"my-collapsible\""));
    }
    #[test]
    fn collapsible_accepts_custom_class() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            class: Some("my-class"),
            children: Some(text("Content")),
            ..Default::default()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("my-class"));
    }
    #[test]
    fn collapsible_trigger_renders_as_button() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        CollapsibleTrigger {
            class: None,
            children: Some(text("Toggle")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("<button"));
        assert!(html.contains("type=\"button\""));
        assert!(html.contains("data-slot=\"collapsible-trigger\""));
        assert!(html.contains("data-part=\"trigger\""));
        assert!(html.contains("data-collapsible-trigger"));
        assert!(html.contains("Toggle"));
    }
    #[test]
    fn collapsible_trigger_accepts_custom_class() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        CollapsibleTrigger {
            class: Some("trigger-class"),
            children: Some(text("Toggle")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("trigger-class"));
    }
    #[test]
    fn collapsible_content_renders_with_data_attributes() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        CollapsibleContent {
            class: None,
            children: Some(text("Hidden content")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("data-slot=\"collapsible-content\""));
        assert!(html.contains("data-collapsible-content"));
        assert!(!html.contains("data-state=\"closed\""));
        assert!(html.contains("var(--proa-collapsible-display, none)"));
        assert!(html.contains("data-part=\"content\""));
        assert!(html.contains("Hidden content"));
    }
    #[test]
    fn collapsible_content_has_overflow_hidden_class() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        CollapsibleContent {
            class: None,
            children: Some(text("Content")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("overflow-hidden"));
    }
    #[test]
    fn collapsible_content_accepts_custom_class() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        CollapsibleContent {
            class: Some("content-class"),
            children: Some(text("Content")),
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("content-class"));
    }
    #[test]
    fn collapsible_const_new() {
        const _: Collapsible<()> = Collapsible::new();
        let collapsible = Collapsible::new();
        assert!(!collapsible.open);
        assert!(!collapsible.disabled);
        assert!(collapsible.class.is_none());
        assert!(collapsible.id.is_none());
        assert!(collapsible.children.is_none());
    }
    #[test]
    fn full_collapsible_composition() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Collapsible {
            open: false,
            children: Some(html_sync! {
                {CollapsibleTrigger { class: None, children: Some(text("Toggle")), }}
                {CollapsibleContent {
                    class: None,
                    children: Some(text("Collapsible content here")),
                }}
            }),
            ..Default::default()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("data-collapsible-root"));
        assert!(html.contains("data-collapsible-trigger"));
        assert!(html.contains("data-collapsible-content"));
        assert!(html.contains("Toggle"));
        assert!(html.contains("Collapsible content here"));
    }

    #[test]
    fn runtime_projects_root_state_ids_and_aria_to_owned_parts() {
        let js = include_str!("../../../runtime/proa-free.js");
        assert!(js.contains("data-collapsible-id"));
        assert!(js.contains("`${id}--trigger`"));
        assert!(js.contains("`${id}--content`"));
        assert!(js.contains("trigger.setAttribute('aria-expanded'"));
        assert!(js.contains("content.setAttribute('aria-hidden'"));
        assert!(js.contains("findOwnedPart(root, this.selectors.root"));
    }
}

// SPDX-FileCopyrightText: 2026 Proa Labs, Inc.
// SPDX-License-Identifier: MIT OR Apache-2.0

use super::{Collapsible, CollapsibleContent, CollapsibleTrigger};
use crate::components::md_support::block_boundary;
use proa_core::WebContext;
use proa_core::{MdRenderSync, WriteBuf, WriteError};
use proa_macros::md_sync;

/// Collapsible is a passthrough — trigger and content handle formatting.
impl<Loader: ::proa_core::DataLoader, B: WriteBuf, C: MdRenderSync<Loader, B>>
    MdRenderSync<Loader, B> for Collapsible<C>
{
    fn render_md(self, cx: &mut WebContext<Loader, B>) -> Result<(), WriteError> {
        self.children.render_md(cx)?;
        block_boundary(cx)?;
        Ok(())
    }
}

/// CollapsibleTrigger renders its label as a bold line.
impl<Loader: ::proa_core::DataLoader, B: WriteBuf, C: MdRenderSync<Loader, B>>
    MdRenderSync<Loader, B> for CollapsibleTrigger<C>
{
    fn render_md(self, cx: &mut WebContext<Loader, B>) -> Result<(), WriteError> {
        block_boundary(cx)?;
        let prev = cx.md_set_inline(true);
        md_sync! { "**" { self.children } "**" }.render_md(cx)?;
        cx.md_set_inline(prev);
        block_boundary(cx)?;
        Ok(())
    }
}

/// CollapsibleContent always renders its children in markdown (no collapse state).
impl<Loader: ::proa_core::DataLoader, B: WriteBuf, C: MdRenderSync<Loader, B>>
    MdRenderSync<Loader, B> for CollapsibleContent<C>
{
    fn render_md(self, cx: &mut WebContext<Loader, B>) -> Result<(), WriteError> {
        block_boundary(cx)?;
        self.children.render_md(cx)?;
        block_boundary(cx)?;
        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn collapsible_renders_bold_trigger_and_content() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Collapsible {
            children: Some((
                CollapsibleTrigger {
                    class: None,
                    children: Some("Show details"),
                },
                CollapsibleContent {
                    class: None,
                    children: Some("The hidden details."),
                },
            )),
            ..Default::default()
        }
        .render_md(&mut cx)
        .unwrap();

        let output = String::from_utf8(buf).unwrap();
        assert!(output.contains("**Show details**"), "output: {output}");
        assert!(output.contains("The hidden details\\."), "output: {output}");
        // Trigger line comes before content
        let trigger_pos = output.find("**Show details**").unwrap();
        let content_pos = output.find("The hidden details\\.").unwrap();
        assert!(trigger_pos < content_pos, "output: {output}");
    }

    /// A collapsible rendered after mid-line prose must start on its own
    /// line, blank-line separated, so the trigger stays a valid bold line.
    #[test]
    fn collapsible_composes_after_inline_text() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        cx.write_md_prepared_static(b"intro prose").unwrap();
        Collapsible {
            children: Some((
                CollapsibleTrigger {
                    class: None,
                    children: Some("Show details"),
                },
                CollapsibleContent {
                    class: None,
                    children: Some("The hidden details."),
                },
            )),
            ..Default::default()
        }
        .render_md(&mut cx)
        .unwrap();

        let output = String::from_utf8(buf).unwrap();
        assert!(
            output.contains("intro prose\n\n**Show details**"),
            "trigger must be blank-line separated from preceding prose, got:\n{output}"
        );
        assert!(
            output.contains("**Show details**\n\nThe hidden details\\."),
            "content must be blank-line separated from the trigger, got:\n{output}"
        );
    }

    #[test]
    fn collapsible_content_renders_even_when_closed() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Collapsible {
            open: false,
            children: Some(CollapsibleContent {
                class: None,
                children: Some("Always visible in markdown"),
            }),
            ..Default::default()
        }
        .render_md(&mut cx)
        .unwrap();

        let output = String::from_utf8(buf).unwrap();
        assert!(
            output.contains("Always visible in markdown"),
            "output: {output}"
        );
    }
}

// SPDX-FileCopyrightText: 2026 Proa Labs, Inc.
// SPDX-License-Identifier: MIT OR Apache-2.0

#![allow(clippy::module_inception)]
//! Collapsible component - an interactive disclosure widget
//!
//! The collapsible component allows toggling visibility of content.
//! JavaScript handles the show/hide behavior.

use crate::Anatomy;

mod collapsible;
mod md;
mod recipe;

/// Static anatomy contract shared by SSR and the delegated runtime.
pub const COLLAPSIBLE_ANATOMY: Anatomy =
    Anatomy::new("collapsible", &["root", "trigger", "content"]);

pub use collapsible::{Collapsible, CollapsibleContent, CollapsibleTrigger};
pub use recipe::{
    collapsible_classes, collapsible_content_classes, collapsible_recipe,
    collapsible_trigger_classes, CollapsibleRecipe, CollapsibleRecipeProps, CollapsibleStyle,
    COLLAPSIBLE_RECIPE,
};

#[cfg(test)]
mod anatomy_tests {
    use super::*;

    #[test]
    fn anatomy_declares_every_public_part() {
        assert_eq!(COLLAPSIBLE_ANATOMY.scope(), "collapsible");
        assert_eq!(COLLAPSIBLE_ANATOMY.parts(), &["root", "trigger", "content"]);
    }
}

// SPDX-FileCopyrightText: 2026 Proa Labs, Inc.
// SPDX-License-Identifier: MIT OR Apache-2.0

//! Collapsible recipe — static named slots for disclosure parts.

use crate::tw_join;
use proa_core::shared::attr_value::AttrValue;
use proa_core::{DataLoader, WebContext, WriteBuf, WriteError};

const COLLAPSIBLE_ROOT: &str = "";
const COLLAPSIBLE_TRIGGER: &str = "";
const COLLAPSIBLE_CONTENT: &str = tw_join!("overflow-hidden", "data-[state=closed]:hidden");

/// Optional inputs accepted by [`CollapsibleRecipe::resolve`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct CollapsibleRecipeProps;

/// Static named classes for every Collapsible part.
#[derive(Debug, Clone, Copy)]
pub struct CollapsibleRecipe {
    pub root: &'static str,
    pub trigger: &'static str,
    pub content: &'static str,
}

impl CollapsibleRecipe {
    pub const fn resolve(&'static self, _props: CollapsibleRecipeProps) -> CollapsibleStyle {
        CollapsibleStyle { recipe: self }
    }
}

/// Fully resolved, streamable Collapsible root style.
#[must_use]
#[derive(Debug, Clone, Copy)]
pub struct CollapsibleStyle {
    recipe: &'static CollapsibleRecipe,
}

impl AttrValue for CollapsibleStyle {
    #[inline(always)]
    fn should_render(&self) -> bool {
        !self.recipe.root.is_empty()
    }

    #[inline(always)]
    fn render_attr_value<B: WriteBuf, L: DataLoader>(
        &self,
        cx: &mut WebContext<L, B>,
    ) -> Result<(), WriteError> {
        cx.out.extend_static(self.recipe.root.as_bytes())
    }
}

pub const COLLAPSIBLE_RECIPE: CollapsibleRecipe = CollapsibleRecipe {
    root: COLLAPSIBLE_ROOT,
    trigger: COLLAPSIBLE_TRIGGER,
    content: COLLAPSIBLE_CONTENT,
};

pub const fn collapsible_recipe() -> &'static CollapsibleRecipe {
    &COLLAPSIBLE_RECIPE
}

impl crate::variant_spec::ComponentSpec for CollapsibleRecipe {
    const NAME: &'static str = "Collapsible";

    fn base_classes(&self) -> &'static str {
        self.root
    }

    fn variant_metadata(&self) -> Vec<crate::variant_spec::VariantMetadata> {
        Vec::new()
    }

    fn anatomy(&self) -> Option<crate::Anatomy> {
        Some(super::COLLAPSIBLE_ANATOMY)
    }
}

/// Compatibility accessors for the former standalone helpers.
pub const fn collapsible_classes() -> &'static str {
    COLLAPSIBLE_RECIPE.root
}

pub const fn collapsible_trigger_classes() -> &'static str {
    COLLAPSIBLE_RECIPE.trigger
}

pub const fn collapsible_content_classes() -> &'static str {
    COLLAPSIBLE_RECIPE.content
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn recipe_exposes_named_slots() {
        let recipe = collapsible_recipe();
        assert!(recipe.root.is_empty());
        assert!(recipe.trigger.is_empty());
        assert!(recipe.content.contains("overflow-hidden"));
        assert!(recipe.content.contains("data-[state=closed]:hidden"));
    }

    #[test]
    fn recipe_is_const_and_copy() {
        const STYLE: CollapsibleStyle = COLLAPSIBLE_RECIPE.resolve(CollapsibleRecipeProps);
        let copied = STYLE;
        assert!(copied.recipe.root.is_empty());
    }

    #[test]
    fn component_metadata_uses_canonical_anatomy() {
        use crate::variant_spec::ComponentSpec;

        assert_eq!(
            COLLAPSIBLE_RECIPE.anatomy(),
            Some(super::super::COLLAPSIBLE_ANATOMY)
        );
        assert!(COLLAPSIBLE_RECIPE.variant_metadata().is_empty());
    }
}