#include "settings.h"
#include "app_state.h"
#include "home.h"
#include "license_blocked_page.h"
#include "wifi_setup_page.h"
#include "audio_settings_page.h"
#include "timezone_page.h"
#include "log_viewer_page.h"
#include "proclamation_options_page.h"
#include "email_address_page.h"
#include "license_key_page.h"
#include "date_format_page.h"
#include <SDL3/SDL.h>
#include <SDL3_image/SDL_image.h>
#include <algorithm>

namespace
{

    constexpr int MENU_ITEM_COUNT = 9;
    // 0 = WiFi Setup, 1 = Audio Options, 2 = Time Zone Setup, 3 = Proclamations,
    // 4 = Email Address, 5 = License Key, 6 = Date Format,
    // 7 = View System Logs, 8 = Back
    constexpr const char *MENU_LABELS[MENU_ITEM_COUNT] = {
        "WiFi Setup",
        "Audio Options",
        "Time Zone Setup",
        "Proclamations",
        "Email Address",
        "License Key",
        "Date Format",
        "View System Logs",
        "Back to Home",
    };

} // anonymous namespace

void Settings::onPush(AppState &state)
{
    state_ = &state;
    TTF_Init();
    createTextures(state);

    state.keybinds.bind(SDLK_UP, "menu_up", [this]()
                        { selectedItem_ = (selectedItem_ - 1 + MENU_ITEM_COUNT) % MENU_ITEM_COUNT; });
    state.keybinds.bind(SDLK_DOWN, "menu_down", [this]()
                        { selectedItem_ = (selectedItem_ + 1) % MENU_ITEM_COUNT; });
}

void Settings::onResume(AppState &state)
{
    state_ = &state;
    createTextures(state);

    state.keybinds.bind(SDLK_UP, "menu_up", [this]()
                        { selectedItem_ = (selectedItem_ - 1 + MENU_ITEM_COUNT) % MENU_ITEM_COUNT; });
    state.keybinds.bind(SDLK_DOWN, "menu_down", [this]()
                        { selectedItem_ = (selectedItem_ + 1) % MENU_ITEM_COUNT; });
}

void Settings::onPause(AppState &state)
{
    state.keybinds.unbindAll();
    destroyTextures();
}

void Settings::onPop(AppState &state)
{
    destroyTextures();
    TTF_Quit();
}

void Settings::handleEvent(const SDL_Event &event)
{
    if (event.type == SDL_EVENT_KEY_DOWN && event.key.key == SDLK_RETURN)
    {
        switch (selectedItem_)
        {
        case 0:
            state_->pages.push(*state_, std::make_unique<WiFiSetupPage>());
            break;
        case 1:
            state_->pages.push(*state_, std::make_unique<AudioSettingsPage>());
            break;
        case 2:
            state_->pages.push(*state_, std::make_unique<TimeZonePage>());
            break;
        case 3:
            // The Proclamation list is license-gated like Play.
            if (state_->licenseTracker.isValid())
            {
                state_->pages.push(*state_, std::make_unique<ProclamationOptionsPage>());
            }
            else
            {
                state_->pages.push(*state_, std::make_unique<LicenseBlockedPage>());
            }
            break;
        case 4:
            state_->pages.push(*state_, std::make_unique<EmailAddressPage>());
            break;
        case 5:
            state_->pages.push(*state_, std::make_unique<LicenseKeyPage>());
            break;
        case 6:
            state_->pages.push(*state_, std::make_unique<DateFormatPage>());
            break;
        case 7:
            state_->pages.push(*state_, std::make_unique<LogViewerPage>());
            break;
        case 8:
            state_->pages.replace(*state_, std::make_unique<Home>());
            break;
        default:
            break;
        }
    }
    else if (event.type == SDL_EVENT_KEY_DOWN && (event.key.key == SDLK_ESCAPE || event.key.key == SDLK_TAB))
    {
        state_->pages.replace(*state_, std::make_unique<Home>());
    }
}

void Settings::update(float dt)
{
}

void Settings::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);

    // 1. Logo Background Image
    if (bgTexture_)
    {
        float scaleX = fw / bgWidth_;
        float scaleY = fh / bgHeight_;
        float scale = std::min(scaleX, scaleY);
        float dw = bgWidth_ * scale;
        float dh = bgHeight_ * scale;
        float dx = (fw - dw) / 2.0f;
        float dy = (fh - dh) / 2.0f;
        SDL_FRect bgDst{dx, dy, dw, dh};
        SDL_RenderTexture(renderer, bgTexture_, nullptr, &bgDst);
    }

    // 2. Dark Overlay
    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 160);
    SDL_FRect overlayRect{0, 0, fw, fh};
    SDL_RenderFillRect(renderer, &overlayRect);

    // 3. Title Text
    float titleY = 60.0f;
    if (titleTexture_)
    {
        float x = (fw - titleWidth_) / 2.0f;
        SDL_FRect dst{x, titleY, titleWidth_, titleHeight_};
        SDL_RenderTexture(renderer, titleTexture_, nullptr, &dst);
    }

    // Compute bounding box for all menu items
    float maxWidth = 0.0f;
    for (const auto &item : items_)
    {
        maxWidth = std::max(maxWidth, item.width);
    }
    float margin = 12.0f; // 12px vertical margin rule

    // Shared left edge for left-aligned items with centered bounding box
    float sharedX = (fw - maxWidth) / 2.0f;

    // Start menu list exactly 24 pixels below title text
    float currentY = titleY + titleHeight_ + 24.0f;

    for (auto &item : items_)
    {
        item.y = currentY;
        if (item.texture)
        {
            SDL_FRect dst{sharedX, item.y, item.width, item.height};
            SDL_RenderTexture(renderer, item.texture, nullptr, &dst);
        }
        currentY += item.height + margin;
    }

    // 6px Underline for selected item occupying half of the 12px margin space
    if (selectedItem_ >= 0 && selectedItem_ < static_cast<int>(items_.size()))
    {
        const auto &item = items_[selectedItem_];
        if (item.texture)
        {
            SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
            SDL_FRect line{sharedX, item.y + item.height + 2.0f, item.width, 6.0f};
            SDL_RenderFillRect(renderer, &line);
        }
    }
}

void Settings::createTextures(AppState &state)
{
    destroyTextures();

    // Background Image
    SDL_Surface *bgSurface = IMG_Load("assets/images/RWT-Circular-Color-ForOnDark-NoText.png");
    if (bgSurface)
    {
        bgTexture_ = SDL_CreateTextureFromSurface(state.renderer, bgSurface);
        bgWidth_ = static_cast<float>(bgSurface->w);
        bgHeight_ = static_cast<float>(bgSurface->h);
        SDL_DestroySurface(bgSurface);
        SDL_SetTextureAlphaMod(bgTexture_, 204);
    }

    SDL_Color white = {255, 255, 255, 255};
    // Title Font
    TTF_Font *fontLarge = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 64);
    if (fontLarge)
    {
        SDL_Surface *surface = TTF_RenderText_Blended(fontLarge, "Settings", 0, white);
        if (surface)
        {
            titleTexture_ = SDL_CreateTextureFromSurface(state.renderer, surface);
            titleWidth_ = static_cast<float>(surface->w);
            titleHeight_ = static_cast<float>(surface->h);
            SDL_DestroySurface(surface);
        }
        TTF_CloseFont(fontLarge);
    }

    // Item Font
    TTF_Font *fontItem = TTF_OpenFont("assets/fonts/Roboto-Regular.ttf", 36);
    if (!fontItem)
        return;

    items_.reserve(MENU_ITEM_COUNT);

    for (int i = 0; i < MENU_ITEM_COUNT; ++i)
    {
        MenuItem item;
        item.label = MENU_LABELS[i];

        SDL_Surface *surface = TTF_RenderText_Blended(fontItem, MENU_LABELS[i], 0, white);
        if (surface)
        {
            item.texture = SDL_CreateTextureFromSurface(state.renderer, surface);
            item.width = static_cast<float>(surface->w);
            item.height = static_cast<float>(surface->h);
            SDL_DestroySurface(surface);
        }
        items_.push_back(std::move(item));
    }

    TTF_CloseFont(fontItem);
}

void Settings::destroyTextures()
{
    if (bgTexture_)
    {
        SDL_DestroyTexture(bgTexture_);
        bgTexture_ = nullptr;
    }
    if (titleTexture_)
    {
        SDL_DestroyTexture(titleTexture_);
        titleTexture_ = nullptr;
    }
    for (auto &item : items_)
    {
        if (item.texture)
        {
            SDL_DestroyTexture(item.texture);
            item.texture = nullptr;
        }
    }
    items_.clear();
}