#include "apps/vpn_page.h"

#include <SD.h>

#include "app_keys.h"
#include "ipv4.h"
#include "ui/fonts.h"
#include "ui/theme.h"
#include "ui/widgets.h"

namespace roro {

void VpnPage::enter() {
    list_.setCount(kRows);
    confirm_.reset();
    message_.clear();
}

bool VpnPage::onKey(const KeyEvent& e) {
    if (confirm_) {
        confirm_->onKey(e);
        int result = confirm_->result();
        if (result == DialogModel::kPending) return true;
        Ask asked = ask_;
        ask_ = Ask::None;
        confirm_.reset();
        if (result == 1 && asked == Ask::DeleteFile) {
            storage_.runJob([]() { SD.remove(kConfPath); });
            message_ = "Imported, and the file is deleted";
        } else if (result == 1 && asked == Ask::Forget) {
            vpn_.forget();
            message_ = "Forgotten";
        }
        return true;
    }
    switch (e.key) {
        case Key::Up: list_.up(); break;
        case Key::Down: list_.down(); break;
        case Key::Back: return false;
        case Key::Left:
        case Key::Right:
        case Key::Select:
            if (e.key != Key::Select && list_.selected() > kAuto) break;
            message_.clear();
            switch (list_.selected()) {
                case kSwitch:
                    if (!vpn_.configured()) message_ = "Import a .conf first";
                    else vpn_.want(!vpn_.wanted());
                    break;
                case kAuto:
                    if (!vpn_.configured()) message_ = "Import a .conf first";
                    else settings_.setBool(Setting::VpnAuto, !settings_.getBool(Setting::VpnAuto));
                    break;
                case kImport: {
                    std::string why = vpn_.importFile(storage_, kConfPath);
                    if (!why.empty()) {
                        message_ = why;
                        break;
                    }
                    message_ = "Imported";
                    ask_ = Ask::DeleteFile;  // the card can be taken out, and the key is in that file
                    confirm_.reset(new DialogModel({"Keep it", "Delete it"}));
                    break;
                }
                case kForget:
                    if (!vpn_.configured()) break;
                    ask_ = Ask::Forget;
                    confirm_.reset(new DialogModel({"Cancel", "Forget"}));
                    break;
                default: break;
            }
            break;
        default: break;
    }
    return true;
}

void VpnPage::help(std::vector<KeyHelp>& out) const {
    if (confirm_) return keys::add(out, keys::kDialog);
    keys::add(out, keys::kVpn);
}

void VpnPage::draw(Canvas& c) {
    const auto& area = theme::kContent;
    c.setTextDatum(top_left);
    bool set = vpn_.configured();
    widgets::list(
        c, list_, {area.x, area.y, area.w, kRows * theme::kLineHeight},
        [](int i) -> std::string {
            switch (i) {
                case kSwitch: return "VPN";
                case kAuto: return "Start with Wi-Fi";
                case kImport: return "Import /vpn/wg0.conf";
                default: return "Forget it";
            }
        },
        [&](int i) -> std::string {
            switch (i) {
                case kSwitch: return !set ? "Not set" : vpn_.wanted() ? "On" : "Off";
                case kAuto: return settings_.getBool(Setting::VpnAuto) ? "On" : "Off";
                default: return "";
            }
        });

    int y = area.y + kRows * theme::kLineHeight + 4;
    c.setFont(&fonts::small);
    auto line = [&](const std::string& text, uint16_t colour) {
        c.setTextColor(colour);
        c.drawString(text.c_str(), 4, y);
        y += 10;
    };
    if (set) {
        const net::WgConfig& k = vpn_.config();
        std::string state = std::string("It is ") + vpn_.stateText();
        int64_t now = clock_.utcNow(), last = vpn_.lastHandshake();
        if (vpn_.state() == VpnService::State::Up && now >= 0 && last > 0 && now >= last) state += ", heard " + std::to_string(now - last) + " s ago";
        line(state, vpn_.state() == VpnService::State::Up ? theme::kAccent : theme::kText);
        line("Server " + k.endpointHost + ":" + std::to_string(k.endpointPort), theme::kMuted);
        line("This device " + net::formatIpv4(k.address) + ", through it " + net::describeWgRouting(k), theme::kMuted);
    } else {
        line("Copy a WireGuard .conf to the card as", theme::kMuted);
        line(std::string(kConfPath) + ", then import it.", theme::kMuted);
    }
    if (!message_.empty()) line(message_, theme::kWarning);
    else if (!vpn_.lastError().empty()) line(vpn_.lastError(), theme::kWarning);

    if (confirm_ && ask_ == Ask::DeleteFile)
        widgets::dialog(c, "Delete the file?", "It is stored in the device now. The file on the card still holds the private key.", *confirm_);
    else if (confirm_)
        widgets::dialog(c, "Forget the VPN?", "The tunnel stops and its keys are erased from the device.", *confirm_);
}

}  // namespace roro