//! Component Migration Helpers Module
//! 
//! This module provides helper functions for migrating specific components
//! to use ArcRwSignal and ArcMemo patterns.

use leptos::prelude::*;
use super::component_types::*;

/// Helper function to create a migrated button component
/// Migrates Button component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_button_component() -> Option<()> {
    // Create persistent signals using ArcRwSignal for state that needs to persist
    let button_state = ArcRwSignal::new(ButtonState {
        variant: ButtonVariant::Default,
        size: ButtonSize::Default,
        disabled: false,
        loading: false,
    });
    
    // Create computed signal using ArcMemo for derived state
    let button_state_for_class = button_state.clone();
    let _button_class = ArcMemo::new(move |_| {
        let state = button_state_for_class.get();
        format!("button-{}-{}", 
            match state.variant {
                ButtonVariant::Default => "default",
                ButtonVariant::Destructive => "destructive",
                ButtonVariant::Outline => "outline",
                ButtonVariant::Secondary => "secondary",
                ButtonVariant::Ghost => "ghost",
                ButtonVariant::Link => "link",
            },
            match state.size {
                ButtonSize::Default => "default",
                ButtonSize::Sm => "sm",
                ButtonSize::Lg => "lg",
                ButtonSize::Icon => "icon",
            }
        )
    });
    
    // Create event handler with proper signal management
    let _handle_click = {
        let button_state = button_state.clone();
        move || {
            if !button_state.get().disabled && !button_state.get().loading {
                // Update state atomically
                button_state.update(|state| {
                    state.loading = true;
                });
                
                // Simulate async operation
                // In real implementation, this would be an async operation
                button_state.update(|state| {
                    state.loading = false;
                });
            }
        }
    };
    
    Some(())
}

/// Helper function to create a migrated input component
/// Migrates Input component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_input_component() -> Option<()> {
    // Create persistent signals for input state
    let input_state = ArcRwSignal::new(InputState {
        value: String::new(),
        placeholder: String::new(),
        disabled: false,
        error: None,
        focused: false,
    });
    
    // Create computed validation state using ArcMemo
    let input_state_for_validation = input_state.clone();
    let _validation_state = ArcMemo::new(move |_| {
        let state = input_state_for_validation.get();
        ValidationState {
            is_valid: state.error.is_none() && !state.value.is_empty(),
            has_error: state.error.is_some(),
            error_message: state.error.clone(),
        }
    });
    
    // Create computed class using ArcMemo
    let input_state_for_class = input_state.clone();
    let validation_state_for_class = _validation_state.clone();
    let _input_class = ArcMemo::new(move |_| {
        let state = input_state_for_class.get();
        let validation = validation_state_for_class.get();
        format!("input-{}-{}", 
            if state.focused { "focused" } else { "unfocused" },
            if validation.has_error { "error" } else { "valid" }
        )
    });
    
    Some(())
}

/// Helper function to create a migrated card component
/// Migrates Card component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_card_component() -> Option<()> {
    // Create persistent signals for card state
    let card_state = ArcRwSignal::new(CardState {
        title: String::new(),
        description: String::new(),
        expanded: false,
        loading: false,
    });
    
    // Create computed card class using ArcMemo
    let _card_class = ArcMemo::new(move |_| {
        let state = card_state.get();
        format!("card-{}-{}", 
            if state.expanded { "expanded" } else { "collapsed" },
            if state.loading { "loading" } else { "ready" }
        )
    });
    
    Some(())
}

/// Helper function to create a migrated form component
/// Migrates Form component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_form_component() -> Option<()> {
    // Create persistent signals for form state
    let form_state = ArcRwSignal::new(FormState {
        fields: std::collections::HashMap::new(),
        is_submitting: false,
        is_valid: false,
        errors: Vec::new(),
    });
    
    // Create computed form validation using ArcMemo
    let _form_validation = ArcMemo::new(move |_| {
        let state = form_state.get();
        FormValidation {
            can_submit: state.is_valid && !state.is_submitting,
            has_errors: !state.errors.is_empty(),
            error_count: state.errors.len(),
        }
    });
    
    Some(())
}

/// Helper function to create a migrated table component
/// Migrates Table component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_table_component() -> Option<()> {
    // Create persistent signals for table state
    let table_state = ArcRwSignal::new(TableState {
        data: Vec::new(),
        sort_column: None,
        sort_direction: SortDirection::Asc,
        selected_rows: std::collections::HashSet::new(),
        page: 1,
        page_size: 10,
    });
    
    // Create computed sorted data using ArcMemo
    let _sorted_data = ArcMemo::new(move |_| {
        let state = table_state.get();
        // In real implementation, this would sort the data
        state.data.clone()
    });
    
    Some(())
}

/// Helper function to create a migrated dialog component
/// Migrates Dialog component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_dialog_component() -> Option<()> {
    // Create persistent signals for dialog state
    let dialog_state = ArcRwSignal::new(DialogState {
        is_open: false,
        title: String::new(),
        content: String::new(),
        can_close: true,
    });
    
    // Create computed dialog class using ArcMemo
    let _dialog_class = ArcMemo::new(move |_| {
        let state = dialog_state.get();
        format!("dialog-{}-{}", 
            if state.is_open { "open" } else { "closed" },
            if state.can_close { "closable" } else { "modal" }
        )
    });
    
    Some(())
}

/// Helper function to create a migrated navigation component
/// Migrates Navigation component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_navigation_component() -> Option<()> {
    // Create persistent signals for navigation state
    let nav_state = ArcRwSignal::new(NavigationState {
        items: Vec::new(),
        active_item: None,
        collapsed: false,
        mobile_open: false,
    });
    
    // Create computed navigation class using ArcMemo
    let _nav_class = ArcMemo::new(move |_| {
        let state = nav_state.get();
        format!("nav-{}-{}", 
            if state.collapsed { "collapsed" } else { "expanded" },
            if state.mobile_open { "mobile" } else { "desktop" }
        )
    });
    
    Some(())
}

/// Helper function to create a migrated toast component
/// Migrates Toast component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_toast_component() -> Option<()> {
    // Create persistent signals for toast state
    let toast_state = ArcRwSignal::new(ToastState {
        message: String::new(),
        variant: ToastVariant::Info,
        duration: 5000,
        is_visible: false,
    });
    
    // Create computed toast class using ArcMemo
    let _toast_class = ArcMemo::new(move |_| {
        let state = toast_state.get();
        format!("toast-{}-{}", 
            match state.variant {
                ToastVariant::Info => "info",
                ToastVariant::Success => "success",
                ToastVariant::Warning => "warning",
                ToastVariant::Error => "error",
            },
            if state.is_visible { "visible" } else { "hidden" }
        )
    });
    
    Some(())
}

/// Helper function to create a migrated calendar component
/// Migrates Calendar component to use ArcRwSignal and ArcMemo patterns
pub fn create_migrated_calendar_component() -> Option<()> {
    // Create persistent signals for calendar state
    let calendar_state = ArcRwSignal::new(CalendarState {
        selected_date: None,
        current_month: chrono::Local::now().date_naive(),
        events: Vec::new(),
        view_mode: CalendarView::Month,
    });
    
    // Create computed calendar data using ArcMemo
    let _calendar_data = ArcMemo::new(move |_| {
        let state = calendar_state.get();
        CalendarData {
            month: state.current_month,
            selected: state.selected_date,
            event_count: state.events.len(),
        }
    });
    
    Some(())
}
