//! Generic loading spinner component

use yew::prelude::*;

/// Size options for the loading spinner
#[derive(Clone, PartialEq)]
pub enum SpinnerSize {
    Small,
    Medium,
    Large,
}

impl SpinnerSize {
    pub fn get_class(&self) -> &'static str {
        match self {
            SpinnerSize::Small => "spinner-border-sm",
            SpinnerSize::Medium => "",
            SpinnerSize::Large => "spinner-border-lg",
        }
    }

    pub fn get_style(&self) -> &'static str {
        match self {
            SpinnerSize::Small => "width: 1rem; height: 1rem;",
            SpinnerSize::Medium => "width: 1.5rem; height: 1.5rem;",
            SpinnerSize::Large => "width: 2rem; height: 2rem;",
        }
    }
}

/// Color options for the loading spinner
#[derive(Clone, PartialEq)]
pub enum SpinnerColor {
    Primary,
    Secondary,
    Success,
    Danger,
    Warning,
    Info,
    Light,
    Dark,
}

impl SpinnerColor {
    pub fn get_class(&self) -> &'static str {
        match self {
            SpinnerColor::Primary => "text-primary",
            SpinnerColor::Secondary => "text-secondary",
            SpinnerColor::Success => "text-success",
            SpinnerColor::Danger => "text-danger",
            SpinnerColor::Warning => "text-warning",
            SpinnerColor::Info => "text-info",
            SpinnerColor::Light => "text-light",
            SpinnerColor::Dark => "text-dark",
        }
    }
}

/// Properties for LoadingSpinner component
#[derive(Properties, PartialEq)]
pub struct LoadingSpinnerProps {
    /// Size of the spinner
    #[prop_or(SpinnerSize::Medium)]
    pub size: SpinnerSize,
    
    /// Color of the spinner
    #[prop_or(SpinnerColor::Primary)]
    pub color: SpinnerColor,
    
    /// Loading message to display
    #[prop_or_default]
    pub message: Option<AttrValue>,
    
    /// Whether to center the spinner
    #[prop_or(true)]
    pub centered: bool,
    
    /// Custom CSS class for container
    #[prop_or_default]
    pub container_class: Option<AttrValue>,
    
    /// Whether to show as inline spinner
    #[prop_or(false)]
    pub inline: bool,
}

/// LoadingSpinner component
#[function_component(LoadingSpinner)]
pub fn loading_spinner(props: &LoadingSpinnerProps) -> Html {
    let container_class = if props.inline {
        "d-inline-flex align-items-center"
    } else if props.centered {
        "d-flex flex-column align-items-center justify-content-center"
    } else {
        "d-flex align-items-center"
    };

    let final_container_class = if let Some(custom_class) = &props.container_class {
        format!("{} {}", container_class, custom_class.as_str())
    } else {
        container_class.to_string()
    };

    let spinner_classes = format!(
        "spinner-border {} {}",
        props.size.get_class(),
        props.color.get_class()
    );

    html! {
        <div class={final_container_class}>
            <div 
                class={spinner_classes}
                style={props.size.get_style()}
                role="status"
                aria-hidden="true"
            >
                <span class="visually-hidden">{"Loading..."}</span>
            </div>
            
            {if let Some(message) = &props.message {
                let message_class = if props.inline {
                    "ms-2"
                } else {
                    "mt-2"
                };
                
                html! {
                    <div class={message_class}>
                        {message.as_str()}
                    </div>
                }
            } else {
                html! {}
            }}
        </div>
    }
}

/// Convenience component for common loading scenarios
#[derive(Properties, PartialEq)]
pub struct LoadingOverlayProps {
    /// Loading message
    #[prop_or("Loading...".to_string())]
    pub message: String,
    
    /// Whether the overlay is visible
    #[prop_or(true)]
    pub show: bool,
    
    /// Background opacity (0.0 to 1.0)
    #[prop_or(0.8)]
    pub opacity: f64,
    
    /// Spinner color
    #[prop_or(SpinnerColor::Primary)]
    pub spinner_color: SpinnerColor,
}

/// LoadingOverlay component for full-screen loading
#[function_component(LoadingOverlay)]
pub fn loading_overlay(props: &LoadingOverlayProps) -> Html {
    if !props.show {
        return html! {};
    }

    let background_style = format!(
        "position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(255, 255, 255, {}); z-index: 9999;",
        props.opacity
    );

    html! {
        <div style={background_style}>
            <div class="d-flex flex-column align-items-center justify-content-center h-100">
                <LoadingSpinner 
                    size={SpinnerSize::Large}
                    color={props.spinner_color.clone()}
                    message={props.message.clone()}
                    centered={true}
                />
            </div>
        </div>
    }
}