#include "wifi_setup_page.h"
#include "app_state.h"
#include "provisioning.h"
#include <SDL3/SDL.h>
#include <algorithm>
#include <iostream>

void WiFiSetupPage::onPush(AppState& state) {
    state_ = &state;
    TTF_Init();
    createFonts();

    // Register F5 keybind for rescan
    state.keybinds.bind(SDLK_F5, "rescan_wifi", [this]() {
        triggerScan();
    });

    state.keybinds.bind(SDLK_UP, "wifi_up", [this]() {
        if (inputMode_ == InputMode::Normal && !networks_.empty()) {
            selectedIndex_ = (selectedIndex_ - 1 + static_cast<int>(networks_.size())) % static_cast<int>(networks_.size());
        }
    });

    state.keybinds.bind(SDLK_DOWN, "wifi_down", [this]() {
        if (inputMode_ == InputMode::Normal && !networks_.empty()) {
            selectedIndex_ = (selectedIndex_ + 1) % static_cast<int>(networks_.size());
        }
    });

    triggerScan();
    refreshNetworkState();
}

void WiFiSetupPage::onResume(AppState& state) {
    state_ = &state;
    createFonts();

    state.keybinds.bind(SDLK_F5, "rescan_wifi", [this]() {
        triggerScan();
    });

    state.keybinds.bind(SDLK_UP, "wifi_up", [this]() {
        if (inputMode_ == InputMode::Normal && !networks_.empty()) {
            selectedIndex_ = (selectedIndex_ - 1 + static_cast<int>(networks_.size())) % static_cast<int>(networks_.size());
        }
    });

    state.keybinds.bind(SDLK_DOWN, "wifi_down", [this]() {
        if (inputMode_ == InputMode::Normal && !networks_.empty()) {
            selectedIndex_ = (selectedIndex_ + 1) % static_cast<int>(networks_.size());
        }
    });

    refreshNetworkState();
}

void WiFiSetupPage::onPause(AppState& state) {
    state.keybinds.unbindAll();
    if (inputMode_ == InputMode::PasswordEntry && state.window) {
        SDL_StopTextInput(state.window);
    }
    destroyFonts();
    destroyTextures();
}

void WiFiSetupPage::onPop(AppState& state) {
    state.keybinds.unbindAll();
    if (inputMode_ == InputMode::PasswordEntry && state.window) {
        SDL_StopTextInput(state.window);
    }
    destroyFonts();
    destroyTextures();
    TTF_Quit();
}

void WiFiSetupPage::createFonts() {
    destroyFonts();
    fontTitle_ = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 52);
    fontHeader_ = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 28);
    fontBody_ = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 32);
    fontSmall_ = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 22);
}

void WiFiSetupPage::destroyFonts() {
    if (fontTitle_) { TTF_CloseFont(fontTitle_); fontTitle_ = nullptr; }
    if (fontHeader_) { TTF_CloseFont(fontHeader_); fontHeader_ = nullptr; }
    if (fontBody_) { TTF_CloseFont(fontBody_); fontBody_ = nullptr; }
    if (fontSmall_) { TTF_CloseFont(fontSmall_); fontSmall_ = nullptr; }
}

void WiFiSetupPage::destroyTextures() {
    titleText_.destroy();
    wifiStatusText_.destroy();
    networkText_.destroy();
    internetText_.destroy();
    statusMsgText_.destroy();
    emptyText_.destroy();
    for (auto& t : ssidRows_) t.destroy();
    ssidRows_.clear();
    for (auto& t : secBadges_) t.destroy();
    secBadges_.clear();
    for (auto& t : sigTexts_) t.destroy();
    sigTexts_.clear();
    passwordPromptText_.destroy();
    passwordValueText_.destroy();
    passwordHintText_.destroy();
    footerText_.destroy();
}

void WiFiSetupPage::triggerScan() {
    if (!state_) return;
    statusMessage_ = "Scanning for available networks...";
    state_->network.requestScan();
    refreshNetworkState();
}

void WiFiSetupPage::refreshNetworkState() {
    if (!state_) return;

    isConnected_ = state_->network.isConnected();
    connectedSsid_ = state_->network.currentSSID();
    hasInternet_ = state_->network.hasInternet();
    savedSsids_ = state_->network.savedNetworks();
    networks_ = state_->network.getScanResults();

    if (selectedIndex_ >= static_cast<int>(networks_.size())) {
        selectedIndex_ = std::max(0, static_cast<int>(networks_.size()) - 1);
    }
}

void WiFiSetupPage::startConnectAsync(const std::string& ssid, const std::string& password) {
    if (connectInProgress_) return;

    connectInProgress_ = true;
    inputMode_ = InputMode::Connecting;
    statusMessage_ = "Connecting to " + ssid + "...";

    connectFuture_ = std::async(std::launch::async, [this, ssid, password]() {
        return state_->network.connect(ssid, password);
    });
}

void WiFiSetupPage::handleEvent(const SDL_Event& event) {
    if (!state_) return;

    if (inputMode_ == InputMode::PasswordEntry) {
        if (event.type == SDL_EVENT_TEXT_INPUT) {
            passwordInput_ += event.text.text;
            return;
        }

        if (event.type == SDL_EVENT_KEY_DOWN) {
            if (event.key.key == SDLK_BACKSPACE) {
                if (!passwordInput_.empty()) {
                    passwordInput_.pop_back();
                }
            } else if (event.key.key == SDLK_RETURN || event.key.key == SDLK_KP_ENTER) {
                if (state_->window) {
                    SDL_StopTextInput(state_->window);
                }
                if (selectedIndex_ >= 0 && selectedIndex_ < static_cast<int>(networks_.size())) {
                    std::string ssid = networks_[selectedIndex_].ssid;
                    startConnectAsync(ssid, passwordInput_);
                }
            } else if (event.key.key == SDLK_ESCAPE) {
                if (state_->window) {
                    SDL_StopTextInput(state_->window);
                }
                inputMode_ = InputMode::Normal;
                statusMessage_ = "Password entry cancelled";
            }
            return;
        }
    } else if (inputMode_ == InputMode::Normal) {
        if (event.type == SDL_EVENT_KEY_DOWN) {
            SDL_Keycode key = event.key.key;
            if (key == SDLK_F5) {
                triggerScan();
            } else if (key == SDLK_UP) {
                if (!networks_.empty()) {
                    selectedIndex_ = (selectedIndex_ - 1 + static_cast<int>(networks_.size())) % static_cast<int>(networks_.size());
                }
            } else if (key == SDLK_DOWN) {
                if (!networks_.empty()) {
                    selectedIndex_ = (selectedIndex_ + 1) % static_cast<int>(networks_.size());
                }
            } else if (key == SDLK_RETURN || key == SDLK_KP_ENTER) {
                if (selectedIndex_ >= 0 && selectedIndex_ < static_cast<int>(networks_.size())) {
                    const auto& net = networks_[selectedIndex_];
                    if (net.security == radiantwave::network::SecurityType::Open) {
                        startConnectAsync(net.ssid, "");
                    } else {
                        inputMode_ = InputMode::PasswordEntry;
                        passwordInput_ = "";
                        statusMessage_ = "Type password and press ENTER to submit";
                        if (state_->window) {
                            SDL_StartTextInput(state_->window);
                        }
                    }
                }
            } else if (key == SDLK_ESCAPE || key == SDLK_TAB) {
                exitPage(*state_);
            }
        }
    }
}

// In the First-Run walkthrough a finished step moves on to the next missing
// prerequisite; otherwise the page returns to whatever pushed it (Settings).
void WiFiSetupPage::exitPage(AppState& state)
{
    if (state.provisioningMode) {
        radiantwave::provisioning::advance(state);
    } else {
        state.pages.pop(state);
    }
}

void WiFiSetupPage::update(float dt) {
    refreshTimer_ += dt;
    if (refreshTimer_ >= 3.0f) {
        refreshTimer_ = 0.0f;
        refreshNetworkState();

        // During the First-Run walkthrough, leave the WiFi page automatically
        // as soon as the internet is reachable (fresh WiFi connection, an
        // Ethernet drop, etc.). Uses the already-refreshed status so no extra
        // blocking probe is needed here.
        if (state_ && state_->provisioningMode && hasInternet_ &&
            !connectInProgress_ && returnTimer_ < 0.0f) {
            statusMessage_ = "Internet connected. Continuing setup...";
            returnTimer_ = 1.5f;
        }
    }

    if (returnTimer_ > 0.0f) {
        returnTimer_ -= dt;
        if (returnTimer_ <= 0.0f) {
            returnTimer_ = -1.0f;
            if (state_ && state_->provisioningMode) {
                exitPage(*state_);
            }
        }
    }

    // Check async connection result
    if (connectInProgress_ && connectFuture_.valid()) {
        auto status = connectFuture_.wait_for(std::chrono::milliseconds(0));
        if (status == std::future_status::ready) {
            auto result = connectFuture_.get();
            connectInProgress_ = false;

            if (result.state == radiantwave::network::ConnectionState::Activated) {
                statusMessage_ = "Connected successfully!";
                inputMode_ = InputMode::Normal;
            } else {
                statusMessage_ = "Connection failed: " + (result.error_message.empty() ? "Authentication or signal error" : result.error_message);
                inputMode_ = InputMode::Normal;
            }
            refreshNetworkState();
        }
    }
}

void WiFiSetupPage::render(SDL_Renderer* renderer) {
    int winW, winH;
    SDL_GetWindowSize(SDL_GetRenderWindow(renderer), &winW, &winH);
    float fw = static_cast<float>(winW);
    float fh = static_cast<float>(winH);

    // Background
    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
    SDL_SetRenderDrawColor(renderer, 20, 20, 30, 255);
    SDL_FRect bgRect{0, 0, fw, fh};
    SDL_RenderFillRect(renderer, &bgRect);

    if (!fontTitle_ || !fontHeader_ || !fontBody_ || !fontSmall_) return;

    SDL_Color white = {255, 255, 255, 255};
    SDL_Color green = {0, 255, 0, 255};
    SDL_Color yellow = {255, 255, 0, 255};
    SDL_Color red = {255, 80, 80, 255};
    SDL_Color cyan = {100, 220, 255, 255};
    SDL_Color gray = {180, 180, 180, 255};

    float currentY = 30.0f;

    // 1. Title
    titleText_.ensure(renderer, fontTitle_, "WiFi Configuration", white);
    if (titleText_.texture) {
        float x = (fw - titleText_.width) / 2.0f;
        SDL_FRect dst{x, currentY, titleText_.width, titleText_.height};
        SDL_RenderTexture(renderer, titleText_.texture, nullptr, &dst);
        currentY += titleText_.height + 20.0f;
    }

    // 2. Status Section (Top Panel)
    std::string wifiStatusStr = isConnected_ ? "WiFi: Connected" : "WiFi: Disconnected";
    SDL_Color statusColor = isConnected_ ? green : red;
    wifiStatusText_.ensure(renderer, fontHeader_, wifiStatusStr, statusColor);
    if (wifiStatusText_.texture) {
        SDL_FRect dst{80.0f, currentY, wifiStatusText_.width, wifiStatusText_.height};
        SDL_RenderTexture(renderer, wifiStatusText_.texture, nullptr, &dst);
    }

    networkText_.ensure(renderer, fontHeader_, "Network: " + (connectedSsid_.empty() ? "None" : connectedSsid_), white);
    if (networkText_.texture) {
        SDL_FRect dst{400.0f, currentY, networkText_.width, networkText_.height};
        SDL_RenderTexture(renderer, networkText_.texture, nullptr, &dst);
    }

    std::string inetStr = hasInternet_ ? "Internet: Reachable" : "Internet: Unreachable";
    SDL_Color inetColor = hasInternet_ ? green : red;
    internetText_.ensure(renderer, fontHeader_, inetStr, inetColor);
    if (internetText_.texture) {
        SDL_FRect dst{900.0f, currentY, internetText_.width, internetText_.height};
        SDL_RenderTexture(renderer, internetText_.texture, nullptr, &dst);
    }
    currentY += 40.0f;

    // 3. Status/Error Message Banner
    if (!statusMessage_.empty()) {
        SDL_SetRenderDrawColor(renderer, 40, 45, 65, 255);
        SDL_FRect bannerRect{80.0f, currentY, fw - 160.0f, 44.0f};
        SDL_RenderFillRect(renderer, &bannerRect);

        SDL_SetRenderDrawColor(renderer, 100, 150, 255, 255);
        SDL_RenderRect(renderer, &bannerRect);

        statusMsgText_.ensure(renderer, fontHeader_, statusMessage_, cyan);
        if (statusMsgText_.texture) {
            SDL_FRect dst{95.0f, currentY + (44.0f - statusMsgText_.height) / 2.0f, statusMsgText_.width, statusMsgText_.height};
            SDL_RenderTexture(renderer, statusMsgText_.texture, nullptr, &dst);
        }
        currentY += 60.0f;
    }

    // 4. Network List
    if (networks_.empty()) {
        emptyText_.ensure(renderer, fontBody_, "No WiFi networks found. Press F5 to scan.", gray);
        if (emptyText_.texture) {
            SDL_FRect dst{80.0f, currentY + 40.0f, emptyText_.width, emptyText_.height};
            SDL_RenderTexture(renderer, emptyText_.texture, nullptr, &dst);
        }
    } else {
        float listY = currentY;
        float rowHeight = 50.0f;

        if (ssidRows_.size() != networks_.size()) ssidRows_.resize(networks_.size());
        if (secBadges_.size() != networks_.size()) secBadges_.resize(networks_.size());
        if (sigTexts_.size() != networks_.size()) sigTexts_.resize(networks_.size());

        for (int i = 0; i < static_cast<int>(networks_.size()); ++i) {
            if (listY + rowHeight > fh - 100.0f) break; // Screen boundaries

            const auto& net = networks_[i];

            // Color coding rules:
            // GREEN = currently connected
            // YELLOW = saved/remembered
            // WHITE = unknown
            SDL_Color textColor = white;
            if (net.ssid == connectedSsid_ && isConnected_) {
                textColor = green;
            } else if (std::find(savedSsids_.begin(), savedSsids_.end(), net.ssid) != savedSsids_.end()) {
                textColor = yellow;
            }

            // Render SSID Name
            ssidRows_[i].ensure(renderer, fontBody_, net.ssid, textColor);
            if (ssidRows_[i].texture) {
                SDL_FRect dst{100.0f, listY, ssidRows_[i].width, ssidRows_[i].height};
                SDL_RenderTexture(renderer, ssidRows_[i].texture, nullptr, &dst);

                // 6px Selection Underline for currently highlighted item
                if (i == selectedIndex_ && inputMode_ == InputMode::Normal) {
                    SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
                    SDL_FRect selLine{100.0f, listY + ssidRows_[i].height + 2.0f, ssidRows_[i].width, 6.0f};
                    SDL_RenderFillRect(renderer, &selLine);
                }
            }

            // Render Security Type Badge
            std::string secStr = "[" + std::string(radiantwave::network::securityTypeToString(net.security)) + "]";
            secBadges_[i].ensure(renderer, fontSmall_, secStr, gray);
            if (secBadges_[i].texture) {
                SDL_FRect dst{700.0f, listY + 6.0f, secBadges_[i].width, secBadges_[i].height};
                SDL_RenderTexture(renderer, secBadges_[i].texture, nullptr, &dst);
            }

            // Render Signal Strength
            std::string sigStr = std::to_string(net.signal_strength) + "%";
            sigTexts_[i].ensure(renderer, fontSmall_, sigStr, gray);
            if (sigTexts_[i].texture) {
                SDL_FRect dst{950.0f, listY + 6.0f, sigTexts_[i].width, sigTexts_[i].height};
                SDL_RenderTexture(renderer, sigTexts_[i].texture, nullptr, &dst);
            }

            listY += rowHeight;
        }
    }

    // 5. Password Entry Overlay Modal
    if (inputMode_ == InputMode::PasswordEntry) {
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 210);
        SDL_FRect modalBg{0, 0, fw, fh};
        SDL_RenderFillRect(renderer, &modalBg);

        float boxW = 800.0f;
        float boxH = 260.0f;
        float boxX = (fw - boxW) / 2.0f;
        float boxY = (fh - boxH) / 2.0f;

        SDL_SetRenderDrawColor(renderer, 35, 40, 60, 255);
        SDL_FRect boxRect{boxX, boxY, boxW, boxH};
        SDL_RenderFillRect(renderer, &boxRect);

        SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
        SDL_RenderRect(renderer, &boxRect);

        if (selectedIndex_ >= 0 && selectedIndex_ < static_cast<int>(networks_.size())) {
            std::string promptStr = "Enter Password for " + networks_[selectedIndex_].ssid + ":";
            passwordPromptText_.ensure(renderer, fontHeader_, promptStr, white);
            if (passwordPromptText_.texture) {
                SDL_FRect dst{boxX + 30.0f, boxY + 25.0f, passwordPromptText_.width, passwordPromptText_.height};
                SDL_RenderTexture(renderer, passwordPromptText_.texture, nullptr, &dst);
            }
        }

        // Render plain text unmasked password
        std::string displayPass = passwordInput_ + "_"; // cursor
        passwordValueText_.ensure(renderer, fontBody_, displayPass, cyan);
        if (passwordValueText_.texture) {
            SDL_FRect dst{boxX + 30.0f, boxY + 95.0f, passwordValueText_.width, passwordValueText_.height};
            SDL_RenderTexture(renderer, passwordValueText_.texture, nullptr, &dst);
        }

        passwordHintText_.ensure(renderer, fontSmall_, "[ENTER] Submit Password     [ESC] Cancel", gray);
        if (passwordHintText_.texture) {
            SDL_FRect dst{boxX + 30.0f, boxY + 195.0f, passwordHintText_.width, passwordHintText_.height};
            SDL_RenderTexture(renderer, passwordHintText_.texture, nullptr, &dst);
        }
    }

    // 6. Footer Hints (Bottom Bar)
    footerText_.ensure(renderer, fontSmall_,
        "[UP/DOWN] Select   [ENTER] Connect   [F5] Rescan Networks   [ESC/TAB] Back", gray);
    if (footerText_.texture) {
        float x = (fw - footerText_.width) / 2.0f;
        SDL_FRect dst{x, fh - 40.0f, footerText_.width, footerText_.height};
        SDL_RenderTexture(renderer, footerText_.texture, nullptr, &dst);
    }
}