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

#include "export_transactions_dialog.h"
#include "../../app.h"
#include "../../util/i18n.h"
#include "../../util/platform.h"
#include "../notifications.h"
#include "../schema/ui_schema.h"
#include "../material/draw_helpers.h"
#include "../theme.h"
#include "imgui.h"

#include <string>
#include <fstream>
#include <sstream>
#include <ctime>
#include <iomanip>

namespace dragonx {
namespace ui {

// Static state
static bool s_open = false;
static char s_filename[256] = "";
static std::string s_status;

// Helper to escape CSV field
static std::string escapeCSV(const std::string& field)
{
    if (field.find(',') != std::string::npos || 
        field.find('"') != std::string::npos ||
        field.find('\n') != std::string::npos) {
        // Escape quotes and wrap in quotes
        std::string escaped;
        escaped.reserve(field.size() + 4);
        escaped += '"';
        for (char c : field) {
            if (c == '"') escaped += "\"\"";
            else escaped += c;
        }
        escaped += '"';
        return escaped;
    }
    return field;
}

void ExportTransactionsDialog::show()
{
    s_open = true;
    s_status.clear();
    
    // Generate default filename with timestamp
    std::time_t now = std::time(nullptr);
    char timebuf[32];
    std::strftime(timebuf, sizeof(timebuf), "%Y%m%d_%H%M%S", std::localtime(&now));
    snprintf(s_filename, sizeof(s_filename), "dragonx_transactions_%s.csv", timebuf);
}

bool ExportTransactionsDialog::isOpen()
{
    return s_open;
}

void ExportTransactionsDialog::render(App* app)
{
    if (!s_open) return;

    auto& S = schema::UI();
    auto win = S.window("dialogs.export-transactions");
    auto exportBtn = S.button("dialogs.export-transactions", "export-button");
    auto closeBtn = S.button("dialogs.export-transactions", "close-button");

    if (material::BeginOverlayDialog(TR("export_tx_title"), &s_open, win.width, 0.94f)) {
        const auto& state = app->getWalletState();
        
        ImGui::Text(TR("export_tx_count"), state.transactions.size());
        
        ImGui::Spacing();
        ImGui::Separator();
        ImGui::Spacing();
        
        // Filename
        ImGui::Text("%s", TR("output_filename"));
        ImGui::SetNextItemWidth(-1);
        ImGui::InputText("##Filename", s_filename, sizeof(s_filename));
        
        ImGui::Spacing();
        ImGui::TextDisabled("%s", TR("file_save_location"));
        
        ImGui::Spacing();
        ImGui::Separator();
        ImGui::Spacing();
        
        // Export button
        if (material::StyledButton(TR("export"), ImVec2(exportBtn.width, 0), S.resolveFont(exportBtn.font))) {
            if (state.transactions.empty()) {
                Notifications::instance().warning(TR("export_tx_none"));
            } else {
                std::string configDir = util::Platform::getConfigDir();
                std::string filepath = configDir + "/" + s_filename;
                
                std::ofstream file(filepath);
                if (!file.is_open()) {
                    s_status = "Failed to create file";
                    Notifications::instance().error(TR("export_tx_file_fail"));
                } else {
                    // Write CSV header
                    file << "Date,Type,Amount,Address,TXID,Confirmations,Memo\n";
                    
                    // Write transactions
                    for (const auto& tx : state.transactions) {
                        // Date
                        std::time_t t = static_cast<std::time_t>(tx.timestamp);
                        char datebuf[32];
                        std::strftime(datebuf, sizeof(datebuf), "%Y-%m-%d %H:%M:%S", std::localtime(&t));
                        file << datebuf << ",";
                        
                        // Type
                        file << escapeCSV(tx.type) << ",";
                        
                        // Amount
                        std::ostringstream amt;
                        amt << std::fixed << std::setprecision(8) << tx.amount;
                        file << amt.str() << ",";
                        
                        // Address
                        file << escapeCSV(tx.address) << ",";
                        
                        // TXID
                        file << escapeCSV(tx.txid) << ",";
                        
                        // Confirmations
                        file << tx.confirmations << ",";
                        
                        // Memo
                        file << escapeCSV(tx.memo) << "\n";
                    }
                    
                    file.close();
                    
                    s_status = "Exported " + std::to_string(state.transactions.size()) + 
                               " transactions to: " + filepath;
                    Notifications::instance().success(TR("export_tx_success"));
                }
            }
        }
        
        ImGui::SameLine();
        if (material::StyledButton("Close", ImVec2(closeBtn.width, 0), S.resolveFont(closeBtn.font))) {
            s_open = false;
        }
        
        // Status
        if (!s_status.empty()) {
            ImGui::Spacing();
            ImGui::TextWrapped("%s", s_status.c_str());
        }
        material::EndOverlayDialog();
    }
}

} // namespace ui
} // namespace dragonx