// Property-based testing utilities for leptos-shadcn-ui components
// Provides comprehensive property-based testing patterns for robust component validation

use proptest::prelude::*;
use std::collections::HashMap;
use leptos::IntoView;

/// Property-based testing strategies for component props
pub mod strategies {
    use super::*;

    /// Generate valid CSS class names
    pub fn css_class_strategy() -> impl Strategy<Value = String> {
        prop::string::string_regex(r"[a-zA-Z][a-zA-Z0-9_-]{0,50}")
            .expect("Valid CSS class regex")
    }

    /// Generate valid HTML IDs
    pub fn html_id_strategy() -> impl Strategy<Value = String> {
        prop::string::string_regex(r"[a-zA-Z][a-zA-Z0-9_-]{0,30}")
            .expect("Valid HTML ID regex")
    }

    /// Generate valid CSS styles
    pub fn css_style_strategy() -> impl Strategy<Value = String> {
        prop::collection::vec(
            (
                prop::string::string_regex(r"[a-z-]+").unwrap(),
                prop::string::string_regex(r"[a-zA-Z0-9#%(),./:; -]+").unwrap(),
            ),
            0..5
        ).prop_map(|pairs| {
            pairs.into_iter()
                .map(|(key, value)| format!("{}: {};", key, value))
                .collect::<Vec<_>>()
                .join(" ")
        })
    }

    /// Generate boolean values with weighted distribution
    pub fn weighted_bool_strategy(true_weight: u32) -> impl Strategy<Value = bool> {
        prop::sample::select(vec![(true_weight, true), (100 - true_weight, false)])
            .prop_map(|(_, value)| value)
    }

    /// Generate optional strings
    pub fn optional_string_strategy() -> impl Strategy<Value = Option<String>> {
        prop::option::of(prop::string::string_regex(r".{0,100}").unwrap())
    }

    /// Generate component size variants
    pub fn size_variant_strategy() -> impl Strategy<Value = String> {
        prop::sample::select(vec!["sm", "default", "lg", "xl"])
            .prop_map(|s| s.to_string())
    }

    /// Generate color variants
    pub fn color_variant_strategy() -> impl Strategy<Value = String> {
        prop::sample::select(vec![
            "default", "primary", "secondary", "success", 
            "warning", "danger", "info", "light", "dark"
        ]).prop_map(|s| s.to_string())
    }

    /// Generate ARIA attributes
    pub fn aria_attributes_strategy() -> impl Strategy<Value = HashMap<String, String>> {
        prop::collection::hash_map(
            prop::sample::select(vec![
                "aria-label",
                "aria-describedby", 
                "aria-expanded",
                "aria-hidden",
                "aria-selected",
                "aria-disabled",
                "role"
            ]).prop_map(|s| s.to_string()),
            optional_string_strategy().prop_map(|opt| opt.unwrap_or_default()),
            0..5
        )
    }
}

/// Property-based testing assertions
pub mod assertions {
    use leptos::prelude::*;

    /// Assert that a component renders without panicking
    pub fn assert_renders_safely<F, V>(render_fn: F) -> bool 
    where
        F: FnOnce() -> V,
        V: IntoView
    {
        std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
            let _ = render_fn();
        })).is_ok()
    }

    /// Assert that a component produces valid HTML structure
    pub fn assert_valid_html_structure<V: IntoView>(view: V) -> bool {
        // In a real implementation, this would parse and validate the HTML
        // For now, we just check that it doesn't panic during rendering
        std::panic::catch_unwind(std::panic::AssertUnwindSafe(|| {
            let _ = view;
        })).is_ok()
    }

    /// Assert that accessibility attributes are present
    pub fn assert_accessibility_compliance(attributes: &std::collections::HashMap<String, String>) -> bool {
        // Check for required accessibility attributes
        let has_role_or_label = attributes.contains_key("role") || 
                               attributes.contains_key("aria-label") ||
                               attributes.get("aria-labelledby").is_some();
        
        // Check that aria-hidden is not "true" when interactive
        let interactive_roles = ["button", "link", "input", "select", "textarea"];
        let is_interactive = attributes.get("role")
            .map(|role| interactive_roles.contains(&role.as_str()))
            .unwrap_or(false);
        
        let hidden = attributes.get("aria-hidden")
            .map(|val| val == "true")
            .unwrap_or(false);

        if is_interactive && hidden {
            return false;
        }

        has_role_or_label
    }

    /// Assert component performance characteristics
    pub fn assert_performance_within_bounds<F, V>(
        render_fn: F,
        max_time_ms: u64,
        max_memory_kb: u64
    ) -> bool 
    where
        F: FnOnce() -> V,
        V: IntoView
    {
        let start = std::time::Instant::now();
        
        // Memory measurement would require more sophisticated tooling
        // For now, we just measure time
        let result = std::panic::catch_unwind(std::panic::AssertUnwindSafe(render_fn));
        
        let duration = start.elapsed();
        
        result.is_ok() && duration.as_millis() <= max_time_ms as u128
    }
}

/// Macro for creating property-based component tests
#[macro_export]
macro_rules! proptest_component {
    (
        $test_name:ident,
        $component:ty,
        $props_strategy:expr,
        $assertions:expr
    ) => {
        #[cfg(test)]
        mod $test_name {
            use super::*;
            use proptest::prelude::*;
            use $crate::property_testing::assertions::*;

            proptest! {
                #[test]
                fn property_test(props in $props_strategy) {
                    let component = <$component>::render(props.clone());
                    
                    // Basic safety assertion
                    assert!(assert_renders_safely(|| <$component>::render(props.clone())));
                    
                    // Custom assertions
                    $assertions(props, component);
                }
            }
        }
    };
}

/// Property-based testing for button-like components
pub mod button_properties {
    use super::*;
    use super::strategies::*;

    #[derive(Debug, Clone)]
    pub struct ButtonProps {
        pub variant: String,
        pub size: String,
        pub disabled: bool,
        pub class: Option<String>,
        pub id: Option<String>,
        pub style: Option<String>,
        pub r#type: String,
    }

    pub fn button_props_strategy() -> impl Strategy<Value = ButtonProps> {
        (
            color_variant_strategy(),
            size_variant_strategy(),
            weighted_bool_strategy(20), // 20% chance of being disabled
            optional_string_strategy(),
            optional_string_strategy(),
            optional_string_strategy(),
            prop::sample::select(vec!["button", "submit", "reset"]).prop_map(|s| s.to_string()),
        ).prop_map(|(variant, size, disabled, class, id, style, r#type)| {
            ButtonProps {
                variant,
                size,
                disabled,
                class,
                id,
                style,
                r#type,
            }
        })
    }

    pub fn assert_button_properties(props: ButtonProps, _component: impl IntoView) {
        // Verify props constraints
        assert!(["sm", "default", "lg", "xl"].contains(&props.size.as_str()));
        assert!(["button", "submit", "reset"].contains(&props.r#type.as_str()));
        
        // Verify variant is valid
        let valid_variants = [
            "default", "primary", "secondary", "success", 
            "warning", "danger", "info", "light", "dark"
        ];
        assert!(valid_variants.contains(&props.variant.as_str()));
    }
}

/// Property-based testing for form components
pub mod form_properties {
    use super::*;
    use super::strategies::*;

    #[derive(Debug, Clone)]
    pub struct FormProps {
        pub action: Option<String>,
        pub method: String,
        pub enctype: Option<String>,
        pub autocomplete: String,
        pub novalidate: bool,
        pub class: Option<String>,
        pub id: Option<String>,
    }

    pub fn form_props_strategy() -> impl Strategy<Value = FormProps> {
        (
            optional_string_strategy(),
            prop::sample::select(vec!["get", "post"]).prop_map(|s| s.to_string()),
            prop::option::of(prop::sample::select(vec![
                "application/x-www-form-urlencoded",
                "multipart/form-data",
                "text/plain"
            ]).prop_map(|s| s.to_string())),
            prop::sample::select(vec!["on", "off"]).prop_map(|s| s.to_string()),
            weighted_bool_strategy(10), // 10% chance of novalidate
            optional_string_strategy(),
            optional_string_strategy(),
        ).prop_map(|(action, method, enctype, autocomplete, novalidate, class, id)| {
            FormProps {
                action,
                method,
                enctype,
                autocomplete,
                novalidate,
                class,
                id,
            }
        })
    }

    pub fn assert_form_properties(props: FormProps, _component: impl IntoView) {
        // Verify method is valid
        assert!(["get", "post"].contains(&props.method.as_str()));
        
        // Verify autocomplete is valid
        assert!(["on", "off"].contains(&props.autocomplete.as_str()));
        
        // Verify enctype is valid if present
        if let Some(enctype) = &props.enctype {
            let valid_enctypes = [
                "application/x-www-form-urlencoded",
                "multipart/form-data", 
                "text/plain"
            ];
            assert!(valid_enctypes.contains(&enctype.as_str()));
        }
    }
}

/// Integration testing utilities
pub mod integration {
    use super::*;

    /// Test component interaction patterns
    pub fn test_component_composition<A, B, F>(
        component_a_props: A,
        component_b_props: B,
        interaction_test: F
    ) -> bool
    where
        F: FnOnce(A, B) -> bool,
    {
        interaction_test(component_a_props, component_b_props)
    }

    /// Test event propagation between components
    pub fn test_event_propagation() -> bool {
        // Placeholder for event propagation testing
        // In a real implementation, this would simulate events and verify they propagate correctly
        true
    }

    /// Test theme consistency across components
    pub fn test_theme_consistency(theme: &str, components: Vec<&str>) -> bool {
        // Verify all components support the given theme
        let supported_themes = ["light", "dark", "high-contrast"];
        if !supported_themes.contains(&theme) {
            return false;
        }

        // In a real implementation, this would render each component with the theme
        // and verify consistent styling
        !components.is_empty()
    }
}

/// Performance property testing
pub mod performance {
    use super::*;
    use std::time::Instant;

    /// Test that component rendering stays within performance bounds
    pub fn test_render_performance<F, V>(
        render_fn: F,
        max_time_ms: u64,
        iterations: u32
    ) -> bool
    where
        F: Fn() -> V + Copy,
        V: IntoView,
    {
        let mut total_time = std::time::Duration::new(0, 0);
        let mut successful_renders = 0;

        for _ in 0..iterations {
            let start = Instant::now();
            
            if std::panic::catch_unwind(std::panic::AssertUnwindSafe(render_fn)).is_ok() {
                total_time += start.elapsed();
                successful_renders += 1;
            }
        }

        if successful_renders == 0 {
            return false;
        }

        let avg_time = total_time / successful_renders;
        avg_time.as_millis() <= max_time_ms as u128
    }

    /// Test memory usage characteristics
    pub fn test_memory_stability<F, V>(render_fn: F, iterations: u32) -> bool
    where
        F: Fn() -> V + Copy,
        V: IntoView,
    {
        // Simple memory stability test - ensure repeated renders don't cause unbounded growth
        // In a real implementation, this would use more sophisticated memory measurement
        
        for _ in 0..iterations {
            if std::panic::catch_unwind(std::panic::AssertUnwindSafe(render_fn)).is_err() {
                return false;
            }
        }
        
        true
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use super::strategies::*;
    use proptest::strategy::ValueTree;
    
    #[test]
    fn test_css_class_strategy() {
        let strategy = css_class_strategy();
        let mut runner = proptest::test_runner::TestRunner::default();
        
        for _ in 0..100 {
            let value = strategy.new_tree(&mut runner).unwrap().current();
            assert!(value.chars().next().unwrap().is_ascii_alphabetic());
            assert!(value.len() <= 51);
        }
    }

    #[test]
    fn test_accessibility_compliance() {
        let mut attrs = std::collections::HashMap::new();
        attrs.insert("aria-label".to_string(), "Test button".to_string());
        
        assert!(assertions::assert_accessibility_compliance(&attrs));
        
        // Test interactive + hidden = bad
        attrs.insert("role".to_string(), "button".to_string());
        attrs.insert("aria-hidden".to_string(), "true".to_string());
        
        assert!(!assertions::assert_accessibility_compliance(&attrs));
    }
}