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

#include "key_export_dialog.h"
#include "../../app.h"
#include "../../wallet/lite_wallet_controller.h"
#include <nlohmann/json.hpp>
#include "../../rpc/rpc_client.h"
#include "../../rpc/rpc_worker.h"
#include "../../util/i18n.h"
#include "../schema/ui_schema.h"
#include "../material/draw_helpers.h"
#include "../material/type.h"
#include "../material/colors.h"
#include "../layout.h"
#include "../widgets/qr_code.h"
#include "../widgets/copy_field.h"
#include "../../embedded/IconsMaterialDesign.h"
#include "imgui.h"

namespace dragonx {
namespace ui {

// Static member initialization
bool KeyExportDialog::s_open = false;
bool KeyExportDialog::s_fetching = false;
bool KeyExportDialog::s_show_key = false;
bool KeyExportDialog::s_show_qr = false;
std::uintptr_t KeyExportDialog::s_qr_tex = 0;
std::string KeyExportDialog::s_qr_cached;
KeyExportDialog::KeyType KeyExportDialog::s_key_type = KeyExportDialog::KeyType::Private;
std::string KeyExportDialog::s_address;
std::string KeyExportDialog::s_key;
std::string KeyExportDialog::s_error;

void KeyExportDialog::releaseQr()
{
    if (s_qr_tex) { FreeQRTexture(s_qr_tex); s_qr_tex = 0; }
    s_qr_cached.clear();
    s_show_qr = false;
}

void KeyExportDialog::show(const std::string& address, KeyType type)
{
    s_open = true;
    s_fetching = false;
    s_show_key = false;
    releaseQr();
    s_key_type = type;
    s_address = address;
    s_key.clear();
    s_error.clear();
}

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

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

    const char* title = (s_key_type == KeyType::Private) ?
        TR("export_private_key") : TR("export_viewing_key");

    auto& S = schema::UI();
    auto warningBox = S.drawElement("dialogs.key-export", "warning-box");
    auto addrInput = S.input("dialogs.key-export", "address-input");
    auto revealBtn = S.button("dialogs.key-export", "reveal-button");
    auto keyDisplay = S.drawElement("dialogs.key-export", "key-display");
    auto copyBtn = S.button("dialogs.key-export", "copy-button");
    auto closeBtn = S.button("dialogs.key-export", "close-button");
    (void)addrInput;
    (void)keyDisplay;
    (void)copyBtn;

    // Modal scales to 85% of the window width. BeginOverlayDialog multiplies the width by
    // Layout::dpiScale(); divide it out here so the final card is exactly 85% at any font scale.
    const float cardW = (0.85f * ImGui::GetMainViewport()->Size.x) / Layout::dpiScale();
    if (material::BeginOverlayDialog(title, &s_open, cardW, 0.94f)) {
        ImGui::Spacing();

        // Warning section with colored background
        ImGui::PushStyleColor(ImGuiCol_ChildBg, ImVec4(0.6f, 0.2f, 0.2f, 0.3f));
        // Auto-size the warning box to its (wrapping, font-scaled) text so it never clips it.
        (void)warningBox;
        ImGui::BeginChild("WarningBox", ImVec2(-1, 0),
                          ImGuiChildFlags_AutoResizeY | ImGuiChildFlags_Borders);

        // Heading — warning icon (drawn with the icon font, not the text font, so it isn't tofu) +
        // larger h6 text, centered, for emphasis.
        {
            ImFont* iconF = material::Type().iconMed();
            ImFont* textF = material::Type().h6();
            const char* icon = ICON_MD_WARNING;
            const char* txt  = TR("warning_upper");
            ImGui::PushFont(iconF); const float iw = ImGui::CalcTextSize(icon).x; ImGui::PopFont();
            ImGui::PushFont(textF); const float tw = ImGui::CalcTextSize(txt).x;  ImGui::PopFont();
            const float sp = ImGui::GetStyle().ItemSpacing.x;
            const float wa = ImGui::GetContentRegionAvail().x;
            const float total = iw + sp + tw;
            ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (wa > total ? (wa - total) * 0.5f : 0.0f));
            const ImVec4 red(1.0f, 0.42f, 0.42f, 1.0f);
            ImGui::PushFont(iconF); ImGui::TextColored(red, "%s", icon); ImGui::PopFont();
            ImGui::SameLine(0, sp);
            ImGui::PushFont(textF); ImGui::TextColored(red, "%s", txt); ImGui::PopFont();
        }
        ImGui::Spacing();

        // Body — centered wrapped text.
        {
            const char* body = (s_key_type == KeyType::Private)
                ? TR("key_export_private_warning") : TR("key_export_viewing_warning");
            ImDrawList* wdl = ImGui::GetWindowDrawList();
            ImFont* wf = ImGui::GetFont();
            const float wfs = ImGui::GetFontSize();
            const float wa = ImGui::GetContentRegionAvail().x;
            const ImVec2 wp = ImGui::GetCursorScreenPos();
            const float bh = widgets::DrawCenteredWrapped(wdl, wf, wfs, wp, wa, material::OnSurface(), body);
            ImGui::Dummy(ImVec2(wa, bh));
        }

        ImGui::EndChild();
        ImGui::PopStyleColor();

        ImGui::Spacing();
        ImGui::Separator();
        ImGui::Spacing();

        // Address — click-to-copy field (chunked, width-clamped, centered).
        ImGui::Text("%s", TR("address_label"));
        widgets::AddressCopyField("##addrcopy", s_address);

        ImGui::Spacing();

        // Key display section
        const char* key_label = (s_key_type == KeyType::Private) ? TR("key_export_private_key") : TR("key_export_viewing_key");
        ImGui::Text("%s", key_label);

        if (s_fetching) {
            ImGui::TextColored(ImVec4(1.0f, 1.0f, 0.0f, 1.0f), "%s", TR("key_export_fetching"));
        } else if (!s_error.empty()) {
            ImGui::TextColored(ImVec4(1.0f, 0.3f, 0.3f, 1.0f), TR("error_format"), s_error.c_str());
        } else if (s_key.empty()) {
            // Show button to fetch key
            if (material::StyledButton(TR("key_export_reveal"), ImVec2(revealBtn.width, 0), S.resolveFont(revealBtn.font))) {
                s_fetching = true;

                // Check if z-address or t-address
                bool is_zaddress = (s_address.length() > 50 || s_address[0] == 'z');

                if (auto* lite = app->liteWallet()) {
                    // Lite wallet: there is no daemon RPC — export the key locally via the SDXL
                    // backend (a local, network-free op) instead of the z_exportkey/dumpprivkey
                    // RPCs, which fail with "Not connected" when no full node is present.
                    const bool wantViewing = (s_key_type != KeyType::Private);
                    if (wantViewing && !is_zaddress) {
                        s_error = TR("key_export_viewing_keys_zonly");
                        s_fetching = false;
                    } else {
                        auto r = lite->exportPrivateKeys(s_address);
                        std::string found;
                        if (r.ok) {
                            try {
                                auto j = nlohmann::json::parse(r.privateKeysJson);
                                const nlohmann::json* entry = nullptr;
                                if (j.is_array()) {
                                    for (auto& e : j)
                                        if (e.contains("address") && e["address"] == s_address) { entry = &e; break; }
                                    if (!entry && !j.empty()) entry = &j.front();
                                } else if (j.is_object()) {
                                    entry = &j;
                                }
                                const char* field = wantViewing ? "viewing_key" : "private_key";
                                if (entry && entry->contains(field) && (*entry)[field].is_string())
                                    found = (*entry)[field].get<std::string>();
                            } catch (...) {}
                            wallet::secureWipeLiteSecret(r.privateKeysJson);
                        }
                        if (!found.empty()) {
                            s_key = found;
                            s_show_key = wantViewing;  // viewing keys are less sensitive
                        } else {
                            s_error = r.ok ? std::string("Key not available for this address") : r.error;
                        }
                        wallet::secureWipeLiteSecret(found);
                        s_fetching = false;
                    }
                } else if (s_key_type == KeyType::Private) {
                    // Export private key
                    std::string addr = s_address;
                    std::string method = is_zaddress ? "z_exportkey" : "dumpprivkey";
                    if (app->worker()) {
                        app->worker()->post([rpc = app->rpc(), addr, method]() -> rpc::RPCWorker::MainCb {
                            std::string key;
                            std::string error;
                            try {
                                rpc::RPCClient::TraceScope trace("Settings / Export key");
                                auto result = rpc->call(method, {addr});
                                key = result.get<std::string>();
                            } catch (const std::exception& e) {
                                error = e.what();
                            }
                            return [key, error]() {
                                if (error.empty()) {
                                    s_key = key;
                                    s_show_key = false;  // Don't show by default
                                } else {
                                    s_error = error;
                                }
                                s_fetching = false;
                            };
                        });
                    }
                } else {
                    // Export viewing key (only for z-addresses)
                    if (is_zaddress) {
                        std::string addr = s_address;
                        if (app->worker()) {
                            app->worker()->post([rpc = app->rpc(), addr]() -> rpc::RPCWorker::MainCb {
                                std::string key;
                                std::string error;
                                try {
                                    rpc::RPCClient::TraceScope trace("Settings / Export viewing key");
                                    auto result = rpc->call("z_exportviewingkey", {addr});
                                    key = result.get<std::string>();
                                } catch (const std::exception& e) {
                                    error = e.what();
                                }
                                return [key, error]() {
                                    if (error.empty()) {
                                        s_key = key;
                                        s_show_key = true;  // Viewing keys are less sensitive
                                    } else {
                                        s_error = error;
                                    }
                                    s_fetching = false;
                                };
                            });
                        }
                    } else {
                        s_error = TR("key_export_viewing_keys_zonly");
                        s_fetching = false;
                    }
                }
            }
            ImGui::SameLine();
            ImGui::TextDisabled("%s", TR("key_export_click_retrieve"));
        } else {
            // Key fetched. Layout: [ key text (click-to-copy) + Show/Hide below ]  [ QR | square ].
            const float gap   = 12.0f;
            const float avail = ImGui::GetContentRegionAvail().x;
            // Larger, responsive QR: ~30% of the content width, clamped to a comfortable range.
            float qrSize = avail * 0.30f;
            if (qrSize < 200.0f) qrSize = 200.0f;
            if (qrSize > 340.0f) qrSize = 340.0f;
            float keyW = avail - qrSize - gap;
            const bool sideBySide = keyW >= 200.0f;   // too narrow -> stack the QR under the key
            if (!sideBySide) keyW = avail;

            // Chunk for readability, but keep a Bech32 HRP (e.g. "secret-extended-key-main") intact
            // rather than slicing it into 4s — only the part from the '1' separator on is chunked.
            auto chunkKey = [](const std::string& s) -> std::string {
                const size_t one = s.find('1');
                if (one != std::string::npos && one > 0) {
                    bool isHrp = true;
                    for (size_t i = 0; i < one; ++i) {
                        const char c = s[i];
                        if (!((c >= 'a' && c <= 'z') || c == '-')) { isHrp = false; break; }
                    }
                    if (isHrp) return s.substr(0, one) + " " + widgets::ChunkString(s.substr(one), 4);
                }
                return widgets::ChunkString(s, 4);
            };
            const std::string shown   = s_show_key ? s_key : std::string(s_key.size(), '*');
            const std::string keyText = chunkKey(shown);

            // Left column: key text (click-to-copy), with the Show/Hide button just below it.
            ImGui::BeginGroup();
            if (widgets::CopyField("##keycopy", keyText, keyW, 0.0f, /*center=*/true)) {
                app->copySecretToClipboard(s_key);  // auto-clearing clipboard
            }
            ImGui::Spacing();
            if (material::StyledButton(s_show_key ? TR("hide") : TR("show"), ImVec2(0, 0),
                                       material::Type().subtitle1())) {
                s_show_key = !s_show_key;
            }
            ImGui::EndGroup();

            if (sideBySide) ImGui::SameLine(0, gap);
            else            ImGui::Spacing();

            // QR to the right of the key when revealed; an empty placeholder square while hidden.
            const ImVec2 sq0 = ImGui::GetCursorScreenPos();
            if (s_show_key && !s_key.empty()) {
                if (s_qr_cached != s_key) {  // (re)generate the QR texture when the key changes
                    if (s_qr_tex) { FreeQRTexture(s_qr_tex); s_qr_tex = 0; }
                    int qw = 0, qh = 0;
                    s_qr_tex = GenerateQRTexture(s_key.c_str(), &qw, &qh);
                    s_qr_cached = s_key;
                }
                if (s_qr_tex) {
                    // White quiet-zone backing so the code stays scannable on dark themes.
                    ImGui::GetWindowDrawList()->AddRectFilled(
                        sq0, ImVec2(sq0.x + qrSize, sq0.y + qrSize), IM_COL32_WHITE, 4.0f);
                    RenderQRCode(s_qr_tex, qrSize);
                } else {
                    ImGui::Dummy(ImVec2(qrSize, qrSize));
                }
            } else {
                // Empty placeholder square — same footprint the QR will occupy once revealed.
                ImGui::Dummy(ImVec2(qrSize, qrSize));
                ImDrawList* dl = ImGui::GetWindowDrawList();
                const ImVec2 sq1(sq0.x + qrSize, sq0.y + qrSize);
                dl->AddRectFilled(sq0, sq1, material::WithAlpha(material::OnSurface(), 8), 6.0f);
                dl->AddRect(sq0, sq1, material::WithAlpha(material::OnSurface(), 45), 6.0f, 0, 1.0f);
            }
        }

        ImGui::Spacing();
        ImGui::Separator();
        ImGui::Spacing();

        // Close button
        float button_width = closeBtn.width;
        float avail_width = ImGui::GetContentRegionAvail().x;
        ImGui::SetCursorPosX(ImGui::GetCursorPosX() + (avail_width - button_width) / 2.0f);

        if (material::StyledButton(TR("close"), ImVec2(button_width, 0), S.resolveFont(closeBtn.font))) {
            s_open = false;
            // Clear sensitive data
            s_key.clear();
            s_show_key = false;
            releaseQr();
        }

        material::EndOverlayDialog();
    }

    // Dialog dismissed any other way (scrim click / Esc): drop the key + its QR texture.
    if (!s_open) {
        if (!s_key.empty()) s_key.clear();
        s_show_key = false;
        releaseQr();
    }
}

} // namespace ui
} // namespace dragonx