Textarea

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

//! Markdown rendering for the textarea component.

use super::Textarea;
use proa_core::WebContext;
use proa_core::{MdRenderSync, WriteBuf, WriteError};
use proa_macros::md_sync;

/// Textarea renders its value — as a fenced code block when multiline,
/// as plain text otherwise. With no value, the placeholder is shown in
/// brackets (matching Input's convention).
impl<Loader: ::proa_core::DataLoader, B: WriteBuf> MdRenderSync<Loader, B> for Textarea {
    fn render_md(self, cx: &mut WebContext<Loader, B>) -> Result<(), WriteError> {
        if let Some(value) = self.value {
            if value
                .as_bytes()
                .iter()
                .any(|byte| matches!(byte, b'\r' | b'\n'))
            {
                cx.md_fenced_code("", value)?;
            } else {
                cx.write_md_text(value)?;
            }
        } else if let Some(placeholder) = self.placeholder {
            md_sync! { "[" { placeholder } "]" }.render_md(cx)?;
        }
        Ok(())
    }
}

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

    #[test]
    fn textarea_renders_placeholder() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Textarea {
            placeholder: Some("Type your message here..."),
            ..Textarea::new()
        }
        .render_md(&mut cx)
        .unwrap();
        assert_eq!(
            String::from_utf8(buf).unwrap(),
            "[Type your message here\\.\\.\\.]"
        );
    }

    #[test]
    fn textarea_single_line_value_is_plain_text() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Textarea {
            value: Some("Initial content"),
            ..Textarea::new()
        }
        .render_md(&mut cx)
        .unwrap();
        assert_eq!(String::from_utf8(buf).unwrap(), "Initial content");
    }

    #[test]
    fn textarea_multiline_value_is_fenced() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Textarea {
            value: Some("line one\nline two"),
            ..Textarea::new()
        }
        .render_md(&mut cx)
        .unwrap();
        let output = String::from_utf8(buf).unwrap();
        assert!(
            output.starts_with("```\nline one\nline two\n```\n"),
            "output: {output}"
        );
    }

    /// A multiline textarea composed after mid-line prose must open its
    /// fence at a blank-line boundary.
    #[test]
    fn textarea_multiline_after_prose_starts_new_block() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        cx.write_md_prepared_static(b"intro prose").unwrap();
        Textarea {
            value: Some("line one\nline two"),
            ..Textarea::new()
        }
        .render_md(&mut cx)
        .unwrap();
        let output = String::from_utf8(buf).unwrap();
        assert!(
            output.contains("intro prose\n\n```\nline one"),
            "output: {output}"
        );
    }

    #[test]
    fn textarea_empty_renders_nothing() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Textarea::new().render_md(&mut cx).unwrap();
        assert!(String::from_utf8(buf).unwrap().is_empty());
    }

    #[test]
    fn textarea_payload_cannot_close_its_fence() {
        let mut buf = Vec::new();
        let mut cx = WebContext::with_buffer(&mut buf);
        Textarea {
            value: Some("before\n```\n- injected list\nafter"),
            ..Textarea::new()
        }
        .render_md(&mut cx)
        .unwrap();
        assert_eq!(
            String::from_utf8(buf).unwrap(),
            "````\nbefore\n```\n- injected list\nafter\n````\n\n"
        );
    }
}

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

#![allow(clippy::module_inception)]
//! Textarea component - form multi-line text input field
//!
//! The Textarea component provides a styled multi-line text input with support for
//! various sizes, validation states, and form integration via proa_ir.

mod md;
mod recipe;
mod textarea;

// Re-export textarea types
pub use textarea::{Textarea, TextareaWrap};

// Re-export recipe types
pub use recipe::{
    textarea_base_classes, textarea_classes, textarea_recipe, TextareaRecipe, TextareaRecipeProps,
    TextareaSize, TextareaStyle, TEXTAREA_RECIPE,
};

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

//! Textarea recipe - type-safe styling system for Textarea component
//!
//! Provides size variants and base styling for the Textarea component.

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

/// Base styles for the textarea - similar to Input but with textarea-specific adjustments
mod base {
    use super::*;

    pub const TEXTAREA_BASE: &str = tw_join!(
        // Layout
        "flex w-full",
        "min-h-16",
        "field-sizing-content",
        // Typography
        "text-base md:text-sm",
        // Colors
        "bg-transparent",
        "text-foreground",
        "placeholder:text-muted-foreground",
        // Border (shadcn input style)
        "border border-input",
        "rounded-md",
        // Shadow
        "shadow-xs",
        // Padding
        "px-3 py-2",
        // Focus visible (shadcn style)
        "focus-visible:outline-hidden",
        "focus-visible:border-ring",
        "focus-visible:ring-ring/50",
        "focus-visible:ring-[3px]",
        // Disabled
        "disabled:cursor-not-allowed",
        "disabled:opacity-50",
        // Selection
        "selection:bg-primary",
        "selection:text-primary-foreground",
        // Aria invalid (error state)
        "aria-invalid:border-destructive",
        "aria-invalid:ring-destructive/20",
        "dark:aria-invalid:ring-destructive/40"
    );
}

/// Size variants for the textarea
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, proa_macros::ProaVariant)]
#[variant(name = "size")]
pub enum TextareaSize {
    Sm,
    #[default]
    Default,
    Lg,
}

impl TextareaSize {
    /// Get the Tailwind classes for this size
    pub const fn classes(self) -> &'static str {
        match self {
            TextareaSize::Sm => "min-h-16 px-2.5 py-1.5 text-xs",
            TextareaSize::Default => "min-h-20 px-3 py-2",
            TextareaSize::Lg => "min-h-32 px-4 py-3 text-base",
        }
    }

    pub const fn as_str(self) -> &'static str {
        match self {
            Self::Sm => "sm",
            Self::Default => "default",
            Self::Lg => "lg",
        }
    }
}

/// Get textarea base classes
pub const fn textarea_base_classes() -> &'static str {
    base::TEXTAREA_BASE
}

/// Optional inputs accepted by [`TextareaRecipe::resolve`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
pub struct TextareaRecipeProps {
    pub size: Option<TextareaSize>,
}

/// Compile-time Textarea recipe.
#[derive(Debug, Clone, Copy)]
pub struct TextareaRecipe {
    root: &'static str,
    size_default: TextareaSize,
}

impl TextareaRecipe {
    pub const fn resolve(&'static self, props: TextareaRecipeProps) -> TextareaStyle {
        let size = match props.size {
            Some(size) => size,
            None => self.size_default,
        };

        TextareaStyle { recipe: self, size }
    }
}

/// Fully resolved, streamable Textarea style.
#[must_use]
#[derive(Debug, Clone, Copy)]
pub struct TextareaStyle {
    recipe: &'static TextareaRecipe,
    size: TextareaSize,
}

impl TextareaStyle {
    pub const fn size(self) -> TextareaSize {
        self.size
    }
}

impl AttrValue for TextareaStyle {
    #[inline(always)]
    fn should_render(&self) -> bool {
        true
    }

    #[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())?;
        cx.out.extend_static(b" ")?;
        cx.out.extend_static(self.size.classes().as_bytes())
    }
}

pub const TEXTAREA_RECIPE: TextareaRecipe = TextareaRecipe {
    root: base::TEXTAREA_BASE,
    size_default: TextareaSize::Default,
};

pub const fn textarea_recipe() -> &'static TextareaRecipe {
    &TEXTAREA_RECIPE
}

/// Compatibility resolver for callers of the former helper.
pub const fn textarea_classes(size: TextareaSize) -> TextareaStyle {
    TEXTAREA_RECIPE.resolve(TextareaRecipeProps { size: Some(size) })
}

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

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

    fn variant_metadata(&self) -> Vec<crate::variant_spec::VariantMetadata> {
        vec![crate::variant_spec::variant_metadata::<TextareaSize>()]
    }
}

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

    #[test]
    fn textarea_base_has_correct_classes() {
        let classes = textarea_base_classes();
        assert!(classes.contains("flex"));
        assert!(classes.contains("rounded-md"));
        assert!(classes.contains("border"));
        assert!(classes.contains("text-foreground"));
    }

    #[test]
    fn textarea_sizes() {
        assert!(TextareaSize::Sm.classes().contains("min-h-16"));
        assert!(TextareaSize::Default.classes().contains("min-h-20"));
        assert!(TextareaSize::Lg.classes().contains("min-h-32"));
    }

    #[test]
    fn recipe_resolves_defaults_and_overrides() {
        let default = textarea_recipe().resolve(TextareaRecipeProps::default());
        assert_eq!(default.size(), TextareaSize::Default);

        let large = textarea_recipe().resolve(TextareaRecipeProps {
            size: Some(TextareaSize::Lg),
        });
        assert_eq!(large.size(), TextareaSize::Lg);
    }
}

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

//! Textarea component implementation
#![allow(unused_must_use)]

use super::recipe::{TextareaRecipeProps, TextareaSize, TEXTAREA_RECIPE};
use crate::free_web::{binding_to_js_attr, JsonAttr};
#[cfg(test)]
use proa_core::ctx::Ctx;
use proa_core::{WebContext, WebRenderSync, WriteBuf};
use proa_ir::{FieldRegistration, ReactiveAttr};
use proa_macros::html_sync;
/// Type-safe Textarea component.
///
/// A form textarea field with support for various sizes and states.
/// Follows the shadcn/ui textarea design with Tailwind CSS styling.
///
/// # Example
///
/// ```ignore
/// use proa_ui::{Textarea, TextareaSize};
/// use proa_macros::html_sync;
///
/// // Basic usage
/// html_sync! {
///     <div>
///         {Textarea {
///             placeholder: Some("Type your message here..."),
///             size: Some(TextareaSize::Default),
///             ..Textarea::new()
///         }}
///     </div>
/// }.render(cx);
///
/// // With form registration
/// let form = ContactForm::form();
/// html_sync! {
///     <div>
///         {Textarea {
///             registration: Some(form.register_message()),
///             placeholder: Some("Your message"),
///             aria_invalid: form.field_message().has_error(),
///             ..Textarea::new()
///         }}
///     </div>
/// }.render(cx);
/// ```
pub struct Textarea {
    pub size: Option<TextareaSize>,
    pub name: Option<&'static str>,
    pub value: Option<&'static str>,
    pub placeholder: Option<&'static str>,
    pub disabled: ReactiveAttr<bool>,
    pub required: bool,
    pub readonly: bool,
    pub autofocus: bool,
    pub rows: Option<&'static str>,
    pub cols: Option<&'static str>,
    pub minlength: Option<&'static str>,
    pub maxlength: Option<&'static str>,
    pub wrap: Option<TextareaWrap>,
    pub aria_label: Option<&'static str>,
    pub aria_describedby: Option<&'static str>,
    pub aria_invalid: ReactiveAttr<bool>,
    /// Field registration data (from form.register_*)
    pub registration: Option<FieldRegistration>,
    pub class: Option<&'static str>,
    pub id: Option<&'static str>,
}
/// Wrap mode for textarea
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
pub enum TextareaWrap {
    #[default]
    Soft,
    Hard,
    Off,
}
impl TextareaWrap {
    /// Get the HTML wrap attribute value
    pub const fn as_str(self) -> &'static str {
        match self {
            TextareaWrap::Soft => "soft",
            TextareaWrap::Hard => "hard",
            TextareaWrap::Off => "off",
        }
    }
}
impl Textarea {
    /// Create a new textarea with default settings
    pub const fn new() -> Self {
        Self {
            size: None,
            name: None,
            value: None,
            placeholder: None,
            disabled: ReactiveAttr::static_value(false),
            required: false,
            readonly: false,
            autofocus: false,
            rows: None,
            cols: None,
            minlength: None,
            maxlength: None,
            wrap: None,
            aria_label: None,
            aria_describedby: None,
            aria_invalid: ReactiveAttr::static_value(false),
            registration: None,
            class: None,
            id: None,
        }
    }
}
impl Default for Textarea {
    fn default() -> Self {
        Self::new()
    }
}
impl<B: WriteBuf, L: ::proa_core::DataLoader> WebRenderSync<L, B> for Textarea {
    #[inline(always)]
    fn render(
        self,
        cx: &mut WebContext<L, B>,
    ) -> Result<(), proa_core::shared::write_buf::WriteError> {
        let style = TEXTAREA_RECIPE.resolve(TextareaRecipeProps { size: self.size });
        let is_disabled = self.disabled.default;
        let is_aria_invalid = self.aria_invalid.default;
        let disabled_binding_string = binding_to_js_attr(&self.disabled.binding);
        let aria_invalid_binding_string = binding_to_js_attr(&self.aria_invalid.binding);
        let disabled_binding = disabled_binding_string.as_deref();
        let aria_invalid_binding = aria_invalid_binding_string.as_deref();
        let registration = self.registration.as_ref();
        let rules_attr = JsonAttr(registration.map(|reg| reg.rules.as_slice()));
        let data_field = registration.map(|reg| reg.data_field);
        let name_attr = registration.map(|reg| reg.name).or(self.name);
        let validate_on = registration.map(|reg| match reg.validate_on {
            proa_ir::ValidationTrigger::Blur => "blur",
            proa_ir::ValidationTrigger::Input => "input",
            proa_ir::ValidationTrigger::Change => "change",
            proa_ir::ValidationTrigger::Submit => "submit",
        });
        let wrap_attr = self.wrap.map(|w| w.as_str());
        html_sync! {
            <textarea
                class={proa_macros::text!("{} {}", style, self.class)}
                id={self.id}
                name={name_attr}
                placeholder={self.placeholder}
                disabled={is_disabled}
                required={self.required}
                readonly={self.readonly}
                autofocus={self.autofocus}
                rows={self.rows}
                cols={self.cols}
                minlength={self.minlength}
                maxlength={self.maxlength}
                wrap={wrap_attr}
                aria-label={self.aria_label}
                aria-describedby={self.aria_describedby}
                aria-invalid={is_aria_invalid}
                data-textarea
                data-slot="textarea"
                data-size={style.size().as_str()}
                data-field={data_field}
                data-rules={rules_attr}
                data-validate-on={validate_on}
                data-bind-disabled={disabled_binding}
                data-bind-aria-invalid={aria_invalid_binding}
            >
                {proa_core::raw_text_ok(self.value.unwrap_or(""))}
            </textarea>
        }
        .render(cx)
    }
}
/// Convert a Binding to a JavaScript expression string
#[cfg(test)]
mod tests {
    use super::*;
    #[test]
    fn textarea_renders_with_defaults() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea::new().render(&mut cx).unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("<textarea"));
        assert!(html.contains("</textarea>"));
        assert!(html.contains("class=\""));
        assert!(html.contains("min-h-20"));
        assert!(html.contains("data-slot=\"textarea\""));
        assert!(html.contains("data-size=\"default\""));
    }
    #[test]
    fn textarea_renders_with_placeholder() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            placeholder: Some("Type your message..."),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("placeholder=\"Type your message...\""));
    }
    #[test]
    fn textarea_renders_with_value() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            value: Some("Initial content"),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("Initial content"));
    }
    #[test]
    fn textarea_applies_sizes() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            size: Some(TextareaSize::Lg),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("min-h-32"));
    }
    #[test]
    fn textarea_handles_disabled_state() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            disabled: true.into(),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains(" disabled"));
    }
    #[test]
    fn textarea_handles_required_state() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            required: true,
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains(" required"));
    }
    #[test]
    fn textarea_renders_with_rows_and_cols() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            rows: Some("5"),
            cols: Some("40"),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("rows=\"5\""));
        assert!(html.contains("cols=\"40\""));
    }
    #[test]
    fn textarea_renders_aria_attributes() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            aria_label: Some("Message"),
            aria_describedby: Some("message-help"),
            aria_invalid: true.into(),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("aria-label=\"Message\""));
        assert!(html.contains("aria-describedby=\"message-help\""));
        assert!(html.contains("aria-invalid"));
    }
    #[test]
    fn textarea_renders_with_custom_class() {
        let mut out = Vec::new();
        let mut cx = Ctx::with_buffer(&mut out);
        Textarea {
            class: Some("custom-textarea"),
            ..Textarea::new()
        }
        .render(&mut cx)
        .unwrap();
        let html = String::from_utf8(out).unwrap();
        assert!(html.contains("custom-textarea"));
    }
    #[test]
    fn textarea_wrap_as_str() {
        assert_eq!(TextareaWrap::Soft.as_str(), "soft");
        assert_eq!(TextareaWrap::Hard.as_str(), "hard");
        assert_eq!(TextareaWrap::Off.as_str(), "off");
    }
    #[test]
    fn textarea_size_is_reasonable() {
        assert!(std::mem::size_of::<Textarea>() < 512);
        const _TEXTAREA: Textarea = Textarea::new();
    }
}