// DragonX Wallet - ImGui Edition
// Copyright 2024-2026 The Hush Developers
// Released under the GPLv3

#pragma once

#include "../material/material.h"
#include "../../config/version.h"
#include "../../embedded/IconsMaterialDesign.h"
#include "imgui.h"
#include <string>
#include <vector>
#include <functional>
#include <cstring>

namespace dragonx {
namespace ui {
namespace screens {

using namespace material;

// ============================================================================
// Settings Screen
// ============================================================================
// Application settings with Material list items

/**
 * @brief Setting category
 */
enum class SettingsCategory {
    Wallet,
    Display,
    Network,
    Privacy,
    Advanced
};

/**
 * @brief Settings data
 */
struct SettingsData {
    // Wallet
    bool autoShield = true;
    double defaultFee = DRAGONX_DEFAULT_FEE;
    
    // Display
    std::string theme = "dark";
    std::string language = "en";
    std::string fiatCurrency = "USD";
    bool showBalanceInFiat = true;
    bool hideEmptyAddresses = true;
    
    // Network
    std::string proxyAddress;
    int proxyPort = 9050;
    bool useTor = false;
    int maxConnections = 125;
    
    // Privacy
    bool rememberAddresses = true;
    bool autoLock = true;
    int autoLockTimeout = 5;  // minutes
    
    // Advanced
    int confirmations = 10;
    std::string dataDir;
    bool debugMode = false;
};

/**
 * @brief Settings screen with Material list
 */
class SettingsScreen {
public:
    void setSettings(const SettingsData& settings) { m_settings = settings; }
    const SettingsData& getSettings() const { return m_settings; }
    
    void setOnSettingsChanged(std::function<void(const SettingsData&)> callback) {
        m_onSettingsChanged = callback;
    }
    
    void setOnBackupWallet(std::function<void()> callback) {
        m_onBackupWallet = callback;
    }
    
    void setOnExportKeys(std::function<void()> callback) {
        m_onExportKeys = callback;
    }
    
    void setOnRescan(std::function<void()> callback) {
        m_onRescan = callback;
    }
    
    void render();
    
private:
    void renderWalletSettings();
    void renderDisplaySettings();
    void renderNetworkSettings();
    void renderPrivacySettings();
    void renderAdvancedSettings();
    void renderAboutSection();
    
    void notifySettingsChanged();
    
    SettingsData m_settings;
    std::function<void(const SettingsData&)> m_onSettingsChanged;
    std::function<void()> m_onBackupWallet;
    std::function<void()> m_onExportKeys;
    std::function<void()> m_onRescan;
    
    SettingsCategory m_selectedCategory = SettingsCategory::Wallet;
};

// ============================================================================
// Implementation
// ============================================================================

inline void SettingsScreen::render() {
    // Title
    Typography::instance().text(TypeStyle::H5, "Settings");
    ImGui::Dummy(ImVec2(0, spacing::dp(2)));
    
    // Category tabs
    TabSpec tabSpec;
    tabSpec.variant = TabVariant::Scrollable;
    
    if (BeginTabs("settings_tabs", tabSpec)) {
        if (Tab(ICON_MD_ACCOUNT_BALANCE_WALLET " Wallet", m_selectedCategory == SettingsCategory::Wallet)) {
            m_selectedCategory = SettingsCategory::Wallet;
        }
        if (Tab(ICON_MD_PALETTE " Display", m_selectedCategory == SettingsCategory::Display)) {
            m_selectedCategory = SettingsCategory::Display;
        }
        if (Tab(ICON_MD_PUBLIC " Network", m_selectedCategory == SettingsCategory::Network)) {
            m_selectedCategory = SettingsCategory::Network;
        }
        if (Tab(ICON_MD_LOCK " Privacy", m_selectedCategory == SettingsCategory::Privacy)) {
            m_selectedCategory = SettingsCategory::Privacy;
        }
        if (Tab(ICON_MD_SETTINGS " Advanced", m_selectedCategory == SettingsCategory::Advanced)) {
            m_selectedCategory = SettingsCategory::Advanced;
        }
        EndTabs();
    }
    
    ImGui::Dummy(ImVec2(0, spacing::dp(2)));
    
    // Settings content
    switch (m_selectedCategory) {
        case SettingsCategory::Wallet:
            renderWalletSettings();
            break;
        case SettingsCategory::Display:
            renderDisplaySettings();
            break;
        case SettingsCategory::Network:
            renderNetworkSettings();
            break;
        case SettingsCategory::Privacy:
            renderPrivacySettings();
            break;
        case SettingsCategory::Advanced:
            renderAdvancedSettings();
            break;
    }
    
    ImGui::Dummy(ImVec2(0, spacing::dp(3)));
    
    // About section (always visible)
    renderAboutSection();
}

inline void SettingsScreen::renderWalletSettings() {
    CardSpec cardSpec;
    cardSpec.elevation = 1;
    cardSpec.padding = 0;
    
    if (BeginCard(cardSpec)) {
        BeginList("wallet_settings", false);
        
        // Auto-shield toggle
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Auto-Shield Transparent Funds";
            itemSpec.secondaryText = "Automatically move transparent balance to shielded";
            itemSpec.dividerBelow = true;
            
            ImGui::PushID("auto_shield");
            ListItem(itemSpec);
            
            // Toggle positioned at end
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.autoShield)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        // Default fee
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Default Transaction Fee";
            
            char feeStr[32];
            snprintf(feeStr, sizeof(feeStr), "%.8f DRGX", m_settings.defaultFee);
            itemSpec.secondaryText = feeStr;
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Backup wallet
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = ICON_MD_SAVE;
            itemSpec.primaryText = "Backup Wallet";
            itemSpec.secondaryText = "Export wallet backup file";
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            if (ListItem(itemSpec)) {
                if (m_onBackupWallet) m_onBackupWallet();
            }
        }
        
        // Export keys
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = ICON_MD_KEY;
            itemSpec.primaryText = "Export Private Keys";
            itemSpec.secondaryText = "Export viewing and spending keys";
            itemSpec.trailingIcon = ">";
            
            if (ListItem(itemSpec)) {
                if (m_onExportKeys) m_onExportKeys();
            }
        }
        
        EndList();
        EndCard();
    }
}

inline void SettingsScreen::renderDisplaySettings() {
    CardSpec cardSpec;
    cardSpec.elevation = 1;
    cardSpec.padding = 0;
    
    if (BeginCard(cardSpec)) {
        BeginList("display_settings", false);
        
        // Theme selection
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Theme";
            itemSpec.secondaryText = m_settings.theme == "dark" ? "Dark" : "Light";
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Language
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Language";
            itemSpec.secondaryText = "English";  // Would map from code
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Fiat currency
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Fiat Currency";
            itemSpec.secondaryText = m_settings.fiatCurrency.c_str();
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Show balance in fiat toggle
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Show Balance in Fiat";
            itemSpec.secondaryText = "Display fiat equivalent on home screen";
            itemSpec.dividerBelow = true;
            
            ImGui::PushID("show_fiat");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.showBalanceInFiat)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        // Hide empty addresses
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Hide Empty Addresses";
            itemSpec.secondaryText = "Don't show addresses with zero balance";
            
            ImGui::PushID("hide_empty");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.hideEmptyAddresses)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        EndList();
        EndCard();
    }
}

inline void SettingsScreen::renderNetworkSettings() {
    CardSpec cardSpec;
    cardSpec.elevation = 1;
    cardSpec.padding = 0;
    
    if (BeginCard(cardSpec)) {
        BeginList("network_settings", false);
        
        // Use Tor
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = "🧅";
            itemSpec.primaryText = "Use Tor Network";
            itemSpec.secondaryText = "Route connections through Tor for privacy";
            itemSpec.dividerBelow = true;
            
            ImGui::PushID("use_tor");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.useTor)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        // Proxy settings (shown if Tor enabled)
        if (m_settings.useTor) {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Proxy Address";
            
            char proxyStr[128];
            snprintf(proxyStr, sizeof(proxyStr), "%s:%d", 
                    m_settings.proxyAddress.empty() ? "127.0.0.1" : m_settings.proxyAddress.c_str(),
                    m_settings.proxyPort);
            itemSpec.secondaryText = proxyStr;
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Max connections
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Maximum Connections";
            
            char connStr[32];
            snprintf(connStr, sizeof(connStr), "%d peers", m_settings.maxConnections);
            itemSpec.secondaryText = connStr;
            itemSpec.trailingIcon = ">";
            
            ListItem(itemSpec);
        }
        
        EndList();
        EndCard();
    }
}

inline void SettingsScreen::renderPrivacySettings() {
    CardSpec cardSpec;
    cardSpec.elevation = 1;
    cardSpec.padding = 0;
    
    if (BeginCard(cardSpec)) {
        BeginList("privacy_settings", false);
        
        // Remember addresses
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Remember Addresses";
            itemSpec.secondaryText = "Save recently used addresses";
            itemSpec.dividerBelow = true;
            
            ImGui::PushID("remember_addr");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.rememberAddresses)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        // Auto-lock
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Auto-Lock Wallet";
            itemSpec.secondaryText = "Lock wallet after inactivity";
            itemSpec.dividerBelow = true;
            
            ImGui::PushID("auto_lock");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.autoLock)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        // Lock timeout (if auto-lock enabled)
        if (m_settings.autoLock) {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Lock Timeout";
            
            char timeoutStr[32];
            snprintf(timeoutStr, sizeof(timeoutStr), "%d minutes", m_settings.autoLockTimeout);
            itemSpec.secondaryText = timeoutStr;
            itemSpec.trailingIcon = ">";
            
            ListItem(itemSpec);
        }
        
        EndList();
        EndCard();
    }
}

inline void SettingsScreen::renderAdvancedSettings() {
    CardSpec cardSpec;
    cardSpec.elevation = 1;
    cardSpec.padding = 0;
    
    if (BeginCard(cardSpec)) {
        BeginList("advanced_settings", false);
        
        // Required confirmations
        {
            ListItemSpec itemSpec;
            itemSpec.primaryText = "Required Confirmations";
            
            char confStr[32];
            snprintf(confStr, sizeof(confStr), "%d blocks", m_settings.confirmations);
            itemSpec.secondaryText = confStr;
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Data directory
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = "📁";
            itemSpec.primaryText = "Data Directory";
            itemSpec.secondaryText = m_settings.dataDir.empty() ? 
                "(default)" : m_settings.dataDir.c_str();
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            ListItem(itemSpec);
        }
        
        // Rescan blockchain
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = ICON_MD_SYNC;
            itemSpec.primaryText = "Rescan Blockchain";
            itemSpec.secondaryText = "Rebuild transaction history from blockchain";
            itemSpec.trailingIcon = ">";
            itemSpec.dividerBelow = true;
            
            if (ListItem(itemSpec)) {
                if (m_onRescan) m_onRescan();
            }
        }
        
        // Debug mode
        {
            ListItemSpec itemSpec;
            itemSpec.leadingIcon = "🐛";
            itemSpec.primaryText = "Debug Mode";
            itemSpec.secondaryText = "Enable verbose logging";
            
            ImGui::PushID("debug_mode");
            ListItem(itemSpec);
            
            ImGui::SameLine(ImGui::GetContentRegionAvail().x - 60);
            if (Switch("##toggle", m_settings.debugMode)) {
                notifySettingsChanged();
            }
            ImGui::PopID();
        }
        
        EndList();
        EndCard();
    }
}

inline void SettingsScreen::renderAboutSection() {
    CardSpec cardSpec;
    cardSpec.elevation = 0;
    cardSpec.padding = spacing::dp(3);
    cardSpec.outlined = true;
    
    if (BeginCard(cardSpec)) {
        float availWidth = ImGui::GetContentRegionAvail().x;
        
        // App name and version centered
        const char* appName = "ObsidianDragon";
        ImVec2 nameSize = ImGui::CalcTextSize(appName);
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (availWidth - nameSize.x) * 0.5f);
        Typography::instance().text(TypeStyle::H6, appName);
        
        char version[64];
        snprintf(version, sizeof(version), "Version %s-imgui", DRAGONX_VERSION);
        ImVec2 versionSize = ImGui::CalcTextSize(version);
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (availWidth - versionSize.x) * 0.5f);
        Typography::instance().textColored(TypeStyle::Caption, OnSurfaceMedium(), version);
        
        ImGui::Dummy(ImVec2(0, spacing::dp(1)));
        
        const char* copyright = "© 2024-2026 The Hush Developers";
        ImVec2 copySize = ImGui::CalcTextSize(copyright);
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (availWidth - copySize.x) * 0.5f);
        Typography::instance().textColored(TypeStyle::Caption, OnSurfaceMedium(), copyright);
        
        const char* license = "Released under GPLv3";
        ImVec2 licenseSize = ImGui::CalcTextSize(license);
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (availWidth - licenseSize.x) * 0.5f);
        Typography::instance().textColored(TypeStyle::Caption, OnSurfaceMedium(), license);
        
        EndCard();
    }
}

inline void SettingsScreen::notifySettingsChanged() {
    if (m_onSettingsChanged) {
        m_onSettingsChanged(m_settings);
    }
}

} // namespace screens
} // namespace ui
} // namespace dragonx