what-core 1.6.0

//! Component registry and rendering system
//!
//! Handles custom component definitions and rendering.
//!
//! ## Component Format
//!
//! Components can be defined in two ways:
//!
//! ### New format (filename-based, recommended):
//! ```html
//! <!-- components/nav.html → <what-nav> -->
//! <what>
//! props = "active, theme"
//! defaults.active = "home"
//! defaults.theme = "light"
//! </what>
//! <nav class="navigation" data-active="#active#">
//!   <slot/>
//! </nav>
//! ```
//!
//! ### Legacy format (with wrapper tag):
//! ```html
//! <component name="card" props="title">
//!   <div class="card"><h2>#title#</h2><slot/></div>
//! </component>
//! ```

use std::collections::HashMap;
use std::path::Path;
use std::sync::Arc;

use crate::parser::{parse_attributes, parse_what_file, replace_variables};
use crate::{Error, Result};

/// A custom component definition
#[derive(Debug, Clone)]
pub struct Component {
    /// Component name (e.g., "what-card", "what-modal")
    pub name: String,
    /// Expected props
    pub props: Vec<String>,
    /// Default values for props
    pub defaults: HashMap<String, String>,
    /// Template content
    pub template: String,
}

impl Component {
    /// Load a component from an HTML template file (legacy format with wrapper tag)
    pub fn from_file(path: impl AsRef<Path>) -> Result<Self> {
        let content = std::fs::read_to_string(&path)?;
        Self::parse(&content)
    }

    /// Load a component from a file, deriving the name from the filename
    ///
    /// This is the new recommended format where:
    /// - Filename becomes the component name: `nav.html` → `nav`
    /// - Props and defaults are defined in a `<what>` block
    /// - Template content is everything outside the `<what>` block
    pub fn from_file_with_name(path: impl AsRef<Path>) -> Result<Self> {
        let path = path.as_ref();
        let content = std::fs::read_to_string(path)?;

        // Derive name from filename (without extension)
        let name = path
            .file_stem()
            .and_then(|s| s.to_str())
            .ok_or_else(|| Error::Component("Invalid filename".to_string()))?
            .to_string();

        Self::parse_with_name(&content, name)
    }

    /// Parse component content with a provided name (filename-based)
    ///
    /// Supports both new `<what>` block format and legacy wrapper tag format.
    pub fn parse_with_name(content: &str, name: String) -> Result<Self> {
        // Check for legacy wrapper tag format first
        if content.contains("<component") || content.contains("<tag") {
            let mut component = Self::parse(content)?;
            // Override name with provided filename-based name
            component.name = name;
            return Ok(component);
        }

        // New format: <what> block + template content
        Self::parse_what_format(content, name)
    }

    /// Parse new format with `<what>` block for props/defaults
    fn parse_what_format(content: &str, name: String) -> Result<Self> {
        let mut props = Vec::new();
        let mut defaults = HashMap::new();
        let mut template = content.to_string();

        // Check for <what> block
        if let Some(what_start) = content.find("<what>") {
            if let Some(what_end) = content.find("</what>") {
                let what_content = &content[what_start + 6..what_end];
                template = format!(
                    "{}{}",
                    content[..what_start].trim(),
                    content[what_end + 7..].trim()
                )
                .trim()
                .to_string();

                // Parse the <what> block using the parser
                let config = parse_what_file(what_content);

                // Extract props
                if let Some(props_value) = config.values.get("props") {
                    if let Some(props_str) = props_value.as_str() {
                        props = props_str
                            .split(',')
                            .map(|s| s.trim().to_string())
                            .filter(|s| !s.is_empty())
                            .collect();
                    }
                }

                // Extract defaults (keys starting with "defaults.")
                for (key, value) in &config.values {
                    if let Some(prop_name) = key.strip_prefix("defaults.") {
                        if let Some(default_value) = value.as_str() {
                            defaults.insert(prop_name.to_string(), default_value.to_string());
                        } else {
                            // Convert other types to string
                            defaults.insert(prop_name.to_string(), value.to_string());
                        }
                    }
                }
            }
        }

        // Also check for self-closing <what ... /> format
        if let Some(what_start) = content.find("<what ") {
            if let Some(what_end) = content[what_start..].find("/>") {
                let what_attrs = &content[what_start + 5..what_start + what_end];
                template = format!(
                    "{}{}",
                    content[..what_start].trim(),
                    content[what_start + what_end + 2..].trim()
                )
                .trim()
                .to_string();

                let attrs = parse_attributes(what_attrs);

                // Extract props from attribute
                if let Some(props_str) = attrs.get("props") {
                    props = props_str
                        .split(',')
                        .map(|s| s.trim().to_string())
                        .filter(|s| !s.is_empty())
                        .collect();
                }

                // Extract defaults from attribute (format: "prop: value, prop2: value2")
                if let Some(defaults_str) = attrs.get("defaults") {
                    for pair in defaults_str.split(',') {
                        if let Some(colon_idx) = pair.find(':') {
                            let key = pair[..colon_idx].trim().to_string();
                            let value = pair[colon_idx + 1..].trim().to_string();
                            defaults.insert(key, value);
                        }
                    }
                }
            }
        }

        Ok(Self {
            name,
            props,
            defaults,
            template,
        })
    }

    /// Parse a component definition from HTML template content (legacy format)
    ///
    /// Expected format:
    /// ```html
    /// <component name="card" props="title, slug">
    ///   <article class="card">
    ///     <h3>#title#</h3>
    ///     <slot/>
    ///   </article>
    /// </component>
    /// ```
    pub fn parse(content: &str) -> Result<Self> {
        // Support both <component> and legacy <tag> elements
        let (start_tag, end_tag) = if content.contains("<component") {
            ("<component", "</component>")
        } else {
            ("<tag", "</tag>")
        };

        let tag_start = content
            .find(start_tag)
            .ok_or_else(|| Error::Component(format!("Missing {} element", start_tag)))?;
        let tag_end = content[tag_start..]
            .find('>')
            .ok_or_else(|| Error::Component(format!("Malformed {} element", start_tag)))?;

        let tag_attrs = &content[tag_start..tag_start + tag_end + 1];
        let attrs = parse_attributes(tag_attrs);

        let name = attrs
            .get("name")
            .ok_or_else(|| Error::Component(format!("Missing 'name' attribute on {}", start_tag)))?
            .clone();

        let props: Vec<String> = attrs
            .get("props")
            .map(|p| p.split(',').map(|s| s.trim().to_string()).collect())
            .unwrap_or_default();

        // Parse defaults from attribute (format: "prop: value, prop2: value2")
        let mut defaults = HashMap::new();
        if let Some(defaults_str) = attrs.get("defaults") {
            for pair in defaults_str.split(',') {
                if let Some(colon_idx) = pair.find(':') {
                    let key = pair[..colon_idx].trim().to_string();
                    let value = pair[colon_idx + 1..].trim().to_string();
                    defaults.insert(key, value);
                }
            }
        }

        // Extract template content between start and end tags
        let content_start = tag_start + tag_end + 1;
        let content_end = content
            .rfind(end_tag)
            .ok_or_else(|| Error::Component(format!("Missing {}", end_tag)))?;

        let template = content[content_start..content_end].trim().to_string();

        Ok(Self {
            name,
            props,
            defaults,
            template,
        })
    }

    /// Render the component with given props and children
    ///
    /// Priority order (highest to lowest):
    /// 1. Passed props (from usage)
    /// 2. Defaults (from component definition)
    /// 3. Empty string (for undeclared props)
    pub fn render(
        &self,
        props: &HashMap<String, String>,
        children: Option<&str>,
        context: &HashMap<String, serde_json::Value>,
    ) -> String {
        // Build context from props
        let mut render_context = context.clone();

        // Set default empty string for all declared props (lowest priority)
        for prop_name in &self.props {
            if !props.contains_key(prop_name) && !self.defaults.contains_key(prop_name) {
                render_context.insert(prop_name.clone(), serde_json::Value::String(String::new()));
            }
        }

        // Apply defaults (medium priority)
        for (key, value) in &self.defaults {
            if !props.contains_key(key) {
                render_context.insert(key.clone(), serde_json::Value::String(value.clone()));
            }
        }

        // Set provided prop values (highest priority - overrides defaults)
        // JSON array/object props are parsed into serde_json::Value for loop resolution
        for (key, value) in props {
            let trimmed = value.trim();
            if (trimmed.starts_with('[') && trimmed.ends_with(']'))
                || (trimmed.starts_with('{') && trimmed.ends_with('}'))
            {
                // Parse JSON props so engine loops can resolve them
                if let Ok(parsed) = serde_json::from_str::<serde_json::Value>(trimmed) {
                    render_context.insert(key.clone(), parsed);
                } else {
                    render_context.insert(key.clone(), serde_json::Value::String(value.clone()));
                }
                continue;
            }
            render_context.insert(key.clone(), serde_json::Value::String(value.clone()));
        }

        // Process loops in the component template before variable replacement
        // This allows JSON array props to be iterated via <loop data="#var#" as="alias">
        let processed_template = Self::process_component_loops(&self.template, &render_context);

        // Replace variables in template
        let mut output = replace_variables(&processed_template, &render_context);

        // Replace <slot/> with children content
        if let Some(children_content) = children {
            output = output.replace("<slot/>", children_content);
            output = output.replace("<slot />", children_content);
        } else {
            output = output.replace("<slot/>", "");
            output = output.replace("<slot />", "");
        }

        output
    }

    /// Process <loop> tags within a component template using the component's context.
    /// This handles JSON array props that are passed to components.
    fn process_component_loops(
        template: &str,
        context: &HashMap<String, serde_json::Value>,
    ) -> String {
        use regex::Regex;
        use std::sync::LazyLock;

        static LOOP_RE: LazyLock<Regex> = LazyLock::new(|| {
            Regex::new(r#"(?s)<loop\s+data="([^"]+)"\s+as="([^"]+)"\s*>(.*?)</loop>"#).unwrap()
        });

        let mut output = template.to_string();

        // Process all loop tags (iterate because loops may be nested)
        for _ in 0..10 {
            let prev = output.clone();
            output = LOOP_RE
                .replace_all(&output, |caps: &regex::Captures| {
                    let data_expr = &caps[1];
                    let alias = &caps[2];
                    let body = &caps[3];

                    // Extract variable name from #var# syntax
                    let var_name = data_expr.trim_matches('#');
                    let parts: Vec<&str> = var_name.split('.').collect();

                    // Resolve from context
                    let data = if let Some(first) = parts.first() {
                        let mut current = context.get(*first);
                        for part in parts.iter().skip(1) {
                            current = current.and_then(|v| {
                                if let serde_json::Value::Object(obj) = v {
                                    obj.get(*part)
                                } else {
                                    None
                                }
                            });
                        }
                        current
                    } else {
                        None
                    };

                    match data {
                        Some(serde_json::Value::Array(items)) => {
                            items
                                .iter()
                                .enumerate()
                                .map(|(index, item)| {
                                    let mut result = body.to_string();
                                    // Replace #alias.field# patterns
                                    if let serde_json::Value::Object(obj) = item {
                                        for (key, val) in obj {
                                            let pattern = format!("#{}{}{}#", alias, ".", key);
                                            let replacement = match val {
                                                serde_json::Value::String(s) => s.clone(),
                                                serde_json::Value::Number(n) => n.to_string(),
                                                serde_json::Value::Bool(b) => b.to_string(),
                                                other => other.to_string(),
                                            };
                                            result = result.replace(&pattern, &replacement);
                                        }
                                    }
                                    // Replace #alias# with the item itself
                                    let alias_pattern = format!("#{}#", alias);
                                    let alias_val = match item {
                                        serde_json::Value::String(s) => s.clone(),
                                        serde_json::Value::Number(n) => n.to_string(),
                                        serde_json::Value::Bool(b) => b.to_string(),
                                        other => other.to_string(),
                                    };
                                    result = result.replace(&alias_pattern, &alias_val);
                                    // Replace index variables
                                    result = result.replace("#index#", &index.to_string());
                                    result = result.replace("#index1#", &(index + 1).to_string());
                                    result
                                })
                                .collect::<Vec<_>>()
                                .join("\n")
                        }
                        _ => {
                            // Can't resolve — leave the loop tag for the engine to handle
                            caps[0].to_string()
                        }
                    }
                })
                .to_string();

            if output == prev {
                break;
            }
        }

        output
    }
}

/// Registry of all available components
#[derive(Debug, Default, Clone)]
pub struct ComponentRegistry {
    components: HashMap<String, Arc<Component>>,
}

impl ComponentRegistry {
    /// Create a new empty registry
    pub fn new() -> Self {
        Self::default()
    }

    /// Register a component
    pub fn register(&mut self, component: Component) {
        self.components
            .insert(component.name.clone(), Arc::new(component));
    }

    /// Get a component by name
    pub fn get(&self, name: &str) -> Option<Arc<Component>> {
        self.components.get(name).cloned()
    }

    /// Get all registered component names
    pub fn component_names(&self) -> Vec<String> {
        self.components.keys().cloned().collect()
    }

    /// Load all components from a directory with what- prefix
    ///
    /// Files in /components/card.html become <what-card>
    /// Supports both new format (filename-based) and legacy format (wrapper tag)
    /// Recursively loads from subdirectories (flat namespace - folders for organization only)
    pub fn load_from_directory(&mut self, path: impl AsRef<Path>) -> Result<()> {
        let path = path.as_ref();
        if !path.exists() {
            return Ok(());
        }

        self.load_from_directory_recursive(path)
    }

    /// Recursively load components from a directory
    fn load_from_directory_recursive(&mut self, path: &Path) -> Result<()> {
        for entry in std::fs::read_dir(path)? {
            let entry = entry?;
            let file_path = entry.path();

            if file_path.is_dir() {
                // Recursively load from subdirectories
                self.load_from_directory_recursive(&file_path)?;
            } else if file_path.extension().map(|e| e == "html").unwrap_or(false) {
                // Use new filename-based loading
                match Component::from_file_with_name(&file_path) {
                    Ok(mut component) => {
                        // Apply what- prefix
                        component.name = format!("what-{}", component.name);
                        tracing::info!("Loaded component: {}", component.name);
                        self.register(component);
                    }
                    Err(e) => {
                        tracing::warn!("Failed to load component from {:?}: {}", file_path, e);
                    }
                }
            }
        }

        Ok(())
    }

    /// Register built-in components
    pub fn register_builtins(&mut self) {
        // <page> component - wraps content with HTML structure (shorthand, no prefix)
        let page_template = r#"<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>#title#</title>
    <link rel="stylesheet" href="/static/what.css">
</head>
<body>
    <slot/>
    <script src="/static/what.js"></script>
</body>
</html>"#
            .to_string();

        // Register as <page> (primary, for user convenience)
        self.register(Component {
            name: "page".to_string(),
            props: vec!["title".to_string()],
            defaults: HashMap::new(),
            template: page_template.clone(),
        });

        // Also register as <what-page> for consistency
        self.register(Component {
            name: "what-page".to_string(),
            props: vec!["title".to_string()],
            defaults: HashMap::new(),
            template: page_template,
        });

        // <what-modal> component - modal dialog with backdrop and close button
        self.register(Component {
            name: "what-modal".to_string(),
            props: vec!["id".to_string(), "title".to_string(), "size".to_string()],
            defaults: {
                let mut d = HashMap::new();
                d.insert("size".to_string(), String::new());
                d
            },
            template: r##"<div id="#id#" class="modal-backdrop">
  <div class="modal #size#">
    <div class="modal-header">
      <h3 class="modal-title">#title#</h3>
      <button type="button" class="modal-close" w-modal-close aria-label="Close">
        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
          <line x1="18" y1="6" x2="6" y2="18"></line>
          <line x1="6" y1="6" x2="18" y2="18"></line>
        </svg>
      </button>
    </div>
    <div class="modal-body">
      <slot/>
    </div>
  </div>
</div>"##.to_string(),
        });

        // <what-drawer> component - slide-in panel with backdrop
        self.register(Component {
            name: "what-drawer".to_string(),
            props: vec!["id".to_string(), "title".to_string(), "position".to_string(), "size".to_string()],
            defaults: {
                let mut d = HashMap::new();
                d.insert("position".to_string(), "right".to_string());
                d
            },
            template: r##"<div id="#id#" class="drawer-backdrop">
  <div class="drawer drawer-#position# #size#">
    <div class="drawer-header">
      <h3 class="drawer-title">#title#</h3>
      <button type="button" class="drawer-close" w-modal-close aria-label="Close">
        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
          <line x1="18" y1="6" x2="6" y2="18"></line>
          <line x1="6" y1="6" x2="18" y2="18"></line>
        </svg>
      </button>
    </div>
    <div class="drawer-body">
      <slot/>
    </div>
  </div>
</div>"##.to_string(),
        });

        // <what-tabs> component - tab container
        self.register(Component {
            name: "what-tabs".to_string(),
            props: vec!["id".to_string(), "style".to_string()],
            defaults: {
                let mut d = HashMap::new();
                d.insert("style".to_string(), String::new());
                d
            },
            template: r##"<div class="tab-list #style#" id="#id#-tabs">
  <slot/>
</div>"##
                .to_string(),
        });

        // <what-accordion> component - native <details>/<summary>, zero JS
        self.register(Component {
            name: "what-accordion".to_string(),
            props: vec![
                "id".to_string(),
                "title".to_string(),
                "expanded".to_string(),
            ],
            defaults: {
                let mut d = HashMap::new();
                d.insert("expanded".to_string(), String::new());
                d
            },
            template: r###"<details id="#id#" class="w-accordion"<if expanded> open</if>>
  <summary class="w-accordion-header">
    <span class="font-semibold">#title#</span>
    <span class="w-accordion-icon">&#9660;</span>
  </summary>
  <div class="w-accordion-content py-3">
    <slot/>
  </div>
</details>"###
                .to_string(),
        });

        // <what-dropdown> component - native details-based dropdown menu
        self.register(Component {
            name: "what-dropdown".to_string(),
            props: vec![
                "label".to_string(),
                "align".to_string(),
                "variant".to_string(),
            ],
            defaults: {
                let mut d = HashMap::new();
                d.insert("label".to_string(), "Menu".to_string());
                d.insert("variant".to_string(), "btn btn-secondary".to_string());
                d.insert("align".to_string(), String::new());
                d
            },
            template: r##"<details class="dropdown #align#">
  <summary class="#variant#">
    #label# <span style="font-size:0.75em">&#9662;</span>
  </summary>
  <div class="dropdown-menu">
    <slot/>
  </div>
</details>"##
                .to_string(),
        });

        // <what-tooltip> component - CSS-positioned hover tooltip
        self.register(Component {
            name: "what-tooltip".to_string(),
            props: vec!["text".to_string(), "position".to_string()],
            defaults: {
                let mut d = HashMap::new();
                d.insert("position".to_string(), "top".to_string());
                d
            },
            template: r##"<span data-tooltip="#text#" data-tooltip-position="#position#" style="cursor:help">
  <slot/>
</span>"##.to_string(),
        });

        // <what-pagination> component - page navigation links
        self.register(Component {
            name: "what-pagination".to_string(),
            props: vec![
                "base_url".to_string(),
                "current".to_string(),
                "total".to_string(),
            ],
            defaults: {
                let mut d = HashMap::new();
                d.insert("current".to_string(), "1".to_string());
                d.insert("total".to_string(), "5".to_string());
                d
            },
            template: r##"<nav class="navigation-pagination">
  <slot/>
</nav>"##
                .to_string(),
        });

        // <what-wire-status> component - wired connection status indicator
        // Shows a green/grey dot and optionally the number of connected users
        self.register(Component {
            name: "what-wire-status".to_string(),
            props: vec!["show-users".to_string()],
            defaults: {
                let mut d = HashMap::new();
                d.insert("show-users".to_string(), "false".to_string());
                d
            },
            template: r##"<span class="w-wire-status" data-show-users="#show-users#"><span class="w-wire-dot"></span><span class="w-wire-users" w-bind="wired._clients"></span></span>"##.to_string(),
        });
    }
}

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

    #[test]
    fn test_parse_component() {
        let content = r##"
<component name="greeting" props="name, title">
    <div class="greeting">
        <h1>#title#</h1>
        <p>Hello, #name#!</p>
        <slot/>
    </div>
</component>
"##;
        let component = Component::parse(content).unwrap();
        assert_eq!(component.name, "greeting");
        assert_eq!(component.props, vec!["name", "title"]);
        assert!(component.template.contains("#title#"));
        assert!(component.defaults.is_empty());
    }

    #[test]
    fn test_parse_legacy_tag() {
        // Still support <tag> for backwards compatibility
        let content = r##"
<tag name="greeting" props="name, title">
    <div class="greeting">
        <h1>#title#</h1>
        <p>Hello, #name#!</p>
        <slot/>
    </div>
</tag>
"##;
        let component = Component::parse(content).unwrap();
        assert_eq!(component.name, "greeting");
    }

    #[test]
    fn test_parse_component_with_defaults() {
        let content = r##"
<component name="nav" props="active, theme" defaults="active: home, theme: light">
    <nav data-active="#active#" data-theme="#theme#"><slot/></nav>
</component>
"##;
        let component = Component::parse(content).unwrap();
        assert_eq!(component.name, "nav");
        assert_eq!(component.props, vec!["active", "theme"]);
        assert_eq!(component.defaults.get("active"), Some(&"home".to_string()));
        assert_eq!(component.defaults.get("theme"), Some(&"light".to_string()));
    }

    #[test]
    fn test_render_component() {
        let component = Component {
            name: "test".to_string(),
            props: vec!["name".to_string()],
            defaults: HashMap::new(),
            template: "<p>Hello #name#!</p><slot/>".to_string(),
        };

        let mut props = HashMap::new();
        props.insert("name".to_string(), "World".to_string());

        let result = component.render(&props, Some("<span>Child</span>"), &HashMap::new());
        assert_eq!(result, "<p>Hello World!</p><span>Child</span>");
    }

    #[test]
    fn test_render_component_with_defaults() {
        let mut defaults = HashMap::new();
        defaults.insert("theme".to_string(), "dark".to_string());
        defaults.insert("size".to_string(), "medium".to_string());

        let component = Component {
            name: "test".to_string(),
            props: vec!["theme".to_string(), "size".to_string()],
            defaults,
            template: "<div class=\"#theme# #size#\"><slot/></div>".to_string(),
        };

        // No props passed - should use defaults
        let result = component.render(&HashMap::new(), Some("Content"), &HashMap::new());
        assert_eq!(result, "<div class=\"dark medium\">Content</div>");

        // Override one default
        let mut props = HashMap::new();
        props.insert("theme".to_string(), "light".to_string());
        let result = component.render(&props, Some("Content"), &HashMap::new());
        assert_eq!(result, "<div class=\"light medium\">Content</div>");

        // Override both defaults
        let mut props = HashMap::new();
        props.insert("theme".to_string(), "blue".to_string());
        props.insert("size".to_string(), "large".to_string());
        let result = component.render(&props, Some("Content"), &HashMap::new());
        assert_eq!(result, "<div class=\"blue large\">Content</div>");
    }

    #[test]
    fn test_parse_what_format() {
        let content = r##"<what>
props = "active, theme"
defaults.active = "home"
defaults.theme = "light"
</what>
<nav data-active="#active#" data-theme="#theme#">
    <slot/>
</nav>"##;

        let component = Component::parse_with_name(content, "nav".to_string()).unwrap();
        assert_eq!(component.name, "nav");
        assert_eq!(component.props, vec!["active", "theme"]);
        assert_eq!(component.defaults.get("active"), Some(&"home".to_string()));
        assert_eq!(component.defaults.get("theme"), Some(&"light".to_string()));
        println!("Template: '{}'", component.template);
        assert!(
            component.template.contains("data-active="),
            "Template should contain data-active=, got: {}",
            component.template
        );
        assert!(!component.template.contains("<what>"));
    }

    #[test]
    fn test_parse_what_format_real_nav() {
        // Test with exact content like the actual nav.html file
        let content = r##"<what>
props = "active"
defaults.active = "home"
</what>
<header class="navigation-top navigation-top-sticky bg-white shadow-sm">
  <a href="/" class="nav-brand">What Framework?</a>
  <nav class="nav-links" data-active="#active#">
    <a href="/" class="nav-link" data-page="home">Home</a>
  </nav>
</header>
"##;

        let component = Component::parse_with_name(content, "nav".to_string()).unwrap();
        println!("Nav component template: '{}'", component.template);
        assert_eq!(component.name, "nav");
        assert_eq!(component.props, vec!["active"]);
        assert_eq!(component.defaults.get("active"), Some(&"home".to_string()));
        assert!(
            component.template.contains("<header"),
            "Template should contain <header>, got: '{}'",
            component.template
        );
        assert!(
            component.template.contains("nav-brand"),
            "Template should contain nav-brand"
        );
        assert!(
            !component.template.contains("<what>"),
            "Template should not contain <what>"
        );
    }

    #[test]
    fn test_load_real_nav_from_file() {
        // Test loading the actual nav.html file from demo directory
        let nav_path = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
            .parent()
            .unwrap() // crates/
            .parent()
            .unwrap() // root
            .join("examples/demo/components/nav.html");

        println!("Loading nav from: {:?}", nav_path);

        let component = Component::from_file_with_name(&nav_path).expect("Failed to load nav.html");
        println!("Loaded component name: {}", component.name);
        println!("Props: {:?}", component.props);
        println!("Defaults: {:?}", component.defaults);
        println!("Template length: {}", component.template.len());
        println!("Template: '{}'", component.template);

        assert_eq!(component.name, "nav");
        assert_eq!(component.props, vec!["active"]);
        assert!(
            component.template.contains("<header"),
            "Template should contain <header>"
        );
        assert!(
            component.template.len() > 100,
            "Template should have content, got len={}",
            component.template.len()
        );

        // Test render
        let mut props = std::collections::HashMap::new();
        props.insert("active".to_string(), "home".to_string());
        let ctx = std::collections::HashMap::new();

        let rendered = component.render(&props, None, &ctx);
        println!("Rendered: '{}'", rendered);
        assert!(
            rendered.contains("<header"),
            "Rendered should contain <header>"
        );
        assert!(
            rendered.contains("nav-brand"),
            "Rendered should contain nav-brand"
        );
    }

    #[test]
    fn test_parse_what_format_no_defaults() {
        let content = r##"<what>
props = "title"
</what>
<h1>#title#</h1>"##;

        let component = Component::parse_with_name(content, "heading".to_string()).unwrap();
        assert_eq!(component.name, "heading");
        assert_eq!(component.props, vec!["title"]);
        assert!(component.defaults.is_empty());
        assert_eq!(component.template, "<h1>#title#</h1>");
    }

    #[test]
    fn test_parse_what_format_no_what_block() {
        // Component without <what> block - just template content
        let content = r##"<div class="simple">
    <slot/>
</div>"##;

        let component = Component::parse_with_name(content, "simple".to_string()).unwrap();
        assert_eq!(component.name, "simple");
        assert!(component.props.is_empty());
        assert!(component.defaults.is_empty());
        assert!(component.template.contains("simple"));
    }

    #[test]
    fn test_load_components_with_prefix() {
        use std::io::Write;
        let temp_dir = tempfile::tempdir().unwrap();
        let comp_dir = temp_dir.path().join("components");
        std::fs::create_dir(&comp_dir).unwrap();

        // Create a test component file (legacy format)
        let mut file = std::fs::File::create(comp_dir.join("card.html")).unwrap();
        writeln!(
            file,
            r##"<component name="card" props="title">
            <div class="card"><h2>#title#</h2><slot/></div>
        </component>"##
        )
        .unwrap();

        let mut registry = ComponentRegistry::new();
        registry.load_from_directory(&comp_dir).unwrap();

        // Should be registered as what-card (filename-based, not from name attribute)
        assert!(registry.get("what-card").is_some());
        assert!(registry.get("card").is_none());
    }

    #[test]
    fn test_load_components_new_format() {
        use std::io::Write;
        let temp_dir = tempfile::tempdir().unwrap();
        let comp_dir = temp_dir.path().join("components");
        std::fs::create_dir(&comp_dir).unwrap();

        // Create a test component file (new format)
        let mut file = std::fs::File::create(comp_dir.join("nav.html")).unwrap();
        writeln!(
            file,
            r##"<what>
props = "active"
defaults.active = "home"
</what>
<nav data-active="#active#"><slot/></nav>"##
        )
        .unwrap();

        let mut registry = ComponentRegistry::new();
        registry.load_from_directory(&comp_dir).unwrap();

        // Should be registered as what-nav
        let nav = registry.get("what-nav").expect("what-nav should exist");
        assert_eq!(nav.props, vec!["active"]);
        assert_eq!(nav.defaults.get("active"), Some(&"home".to_string()));
    }

    #[test]
    fn test_load_components_recursive() {
        use std::io::Write;
        let temp_dir = tempfile::tempdir().unwrap();
        let comp_dir = temp_dir.path().join("components");
        let sub_dir = comp_dir.join("forms");
        std::fs::create_dir_all(&sub_dir).unwrap();

        // Create component in root
        let mut file = std::fs::File::create(comp_dir.join("card.html")).unwrap();
        writeln!(file, "<div class=\"card\"><slot/></div>").unwrap();

        // Create component in subdirectory
        let mut file = std::fs::File::create(sub_dir.join("input.html")).unwrap();
        writeln!(file, "<input type=\"text\" />").unwrap();

        let mut registry = ComponentRegistry::new();
        registry.load_from_directory(&comp_dir).unwrap();

        // Both should be loaded with flat namespace
        assert!(registry.get("what-card").is_some());
        assert!(registry.get("what-input").is_some());
        // Should NOT be scoped by folder
        assert!(registry.get("what-forms-input").is_none());
    }

    #[test]
    fn test_render_component_json_array_prop() {
        let component = Component {
            name: "groups".to_string(),
            props: vec!["groups".to_string()],
            defaults: HashMap::new(),
            template: "<ul><loop data=\"#groups#\" as=\"g\"><li>#g.name#</li></loop></ul>"
                .to_string(),
        };

        let mut props = HashMap::new();
        props.insert(
            "groups".to_string(),
            r#"[{"id":1,"name":"Admins"},{"id":2,"name":"Editors"}]"#.to_string(),
        );

        let _result = component.render(&props, None, &HashMap::new());

        // The JSON array should be parsed and available in the context
        // (loop processing happens in the engine, not here, but the context should have the array)
        // Verify the prop is inserted as a JSON array, not a string
        let mut ctx = HashMap::new();
        let trimmed = props["groups"].trim();
        if trimmed.starts_with('[') && trimmed.ends_with(']') {
            if let Ok(json_val) = serde_json::from_str::<serde_json::Value>(&props["groups"]) {
                ctx.insert("groups".to_string(), json_val);
            }
        }
        assert!(
            ctx["groups"].is_array(),
            "JSON array prop should be parsed as array"
        );
        assert_eq!(ctx["groups"].as_array().unwrap().len(), 2);
    }

    // =========================================================================
    // Built-in Component Tests
    // =========================================================================

    #[test]
    fn builtin_modal_renders() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let modal = registry.get("what-modal").unwrap();
        let mut props = HashMap::new();
        props.insert("id".to_string(), "my-modal".to_string());
        props.insert("title".to_string(), "Confirm".to_string());
        let result = modal.render(&props, Some("<p>Are you sure?</p>"), &HashMap::new());
        assert!(result.contains("id=\"my-modal\""));
        assert!(result.contains("Confirm"));
        assert!(result.contains("Are you sure?"));
        assert!(result.contains("modal-backdrop"));
    }

    #[test]
    fn builtin_drawer_defaults_right() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let drawer = registry.get("what-drawer").unwrap();
        let mut props = HashMap::new();
        props.insert("id".to_string(), "side".to_string());
        props.insert("title".to_string(), "Menu".to_string());
        let result = drawer.render(&props, Some("<ul><li>Home</li></ul>"), &HashMap::new());
        assert!(result.contains("drawer-right"));
        assert!(result.contains("Menu"));
    }

    #[test]
    fn builtin_tabs_renders() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let tabs = registry.get("what-tabs").unwrap();
        let mut props = HashMap::new();
        props.insert("id".to_string(), "main".to_string());
        let result = tabs.render(&props, Some("<button>Tab 1</button>"), &HashMap::new());
        assert!(result.contains("id=\"main-tabs\""));
        assert!(result.contains("tab-list"));
        assert!(result.contains("Tab 1"));
    }

    #[test]
    fn builtin_accordion_renders() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let acc = registry.get("what-accordion").unwrap();
        let mut props = HashMap::new();
        props.insert("id".to_string(), "faq1".to_string());
        props.insert("title".to_string(), "What is this?".to_string());
        let result = acc.render(&props, Some("<p>An accordion</p>"), &HashMap::new());
        assert!(result.contains("What is this?"));
        assert!(result.contains("w-accordion-header"));
        assert!(result.contains("An accordion"));
    }

    #[test]
    fn builtin_dropdown_defaults() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let dd = registry.get("what-dropdown").unwrap();
        let result = dd.render(&HashMap::new(), Some("<a>Item 1</a>"), &HashMap::new());
        assert!(result.contains("Menu"));
        assert!(result.contains("btn btn-secondary"));
        assert!(result.contains("dropdown-menu"));
        assert!(result.contains("Item 1"));
    }

    #[test]
    fn builtin_tooltip_renders() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let tt = registry.get("what-tooltip").unwrap();
        let mut props = HashMap::new();
        props.insert("text".to_string(), "Help text".to_string());
        let result = tt.render(&props, Some("Hover me"), &HashMap::new());
        assert!(result.contains("data-tooltip=\"Help text\""));
        assert!(result.contains("data-tooltip-position=\"top\""));
        assert!(result.contains("Hover me"));
    }

    #[test]
    fn builtin_pagination_renders() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        let pg = registry.get("what-pagination").unwrap();
        let result = pg.render(&HashMap::new(), Some("<a>1</a><a>2</a>"), &HashMap::new());
        assert!(result.contains("navigation-pagination"));
        assert!(result.contains("<a>1</a>"));
    }

    #[test]
    fn builtin_no_jumbo_or_left_nav() {
        let mut registry = ComponentRegistry::new();
        registry.register_builtins();
        assert!(
            registry.get("what-jumbo").is_none(),
            "what-jumbo should be removed"
        );
        assert!(
            registry.get("what-left-nav").is_none(),
            "what-left-nav should be removed"
        );
    }
}