#include "email_address_page.h"
#include "app_state.h"
#include "db/db_keys.h"
#include "provisioning.h"
#include "validation.h"
#include "logical_size.h"
#include <SDL3/SDL.h>

namespace {

constexpr size_t MAX_EMAIL_LENGTH = 254;

} // anonymous namespace

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

    storedValue_ = state.db.getKV(radiantwave::db::KV_EMAIL_ADDRESS);
    input_ = storedValue_;
    statusMessage_ = "Enter or edit the email address, then press ENTER";

    if (state.window) {
        SDL_StartTextInput(state.window);
    }
}

void EmailAddressPage::onResume(AppState& state)
{
    state_ = &state;
    createFonts();
    storedValue_ = state.db.getKV(radiantwave::db::KV_EMAIL_ADDRESS);
    input_ = storedValue_;

    if (state.window) {
        SDL_StartTextInput(state.window);
    }
}

void EmailAddressPage::onPause(AppState& state)
{
    state.keybinds.unbindAll();
    if (state.window) {
        SDL_StopTextInput(state.window);
    }
    destroyFonts();
    destroyTextures();
}

void EmailAddressPage::onPop(AppState& state)
{
    if (state.window) {
        SDL_StopTextInput(state.window);
    }
    destroyFonts();
    destroyTextures();
    TTF_Quit();
}

void EmailAddressPage::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 EmailAddressPage::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 EmailAddressPage::destroyTextures()
{
    titleText_.destroy();
    storedText_.destroy();
    valueText_.destroy();
    statusText_.destroy();
    hintText_.destroy();
}

void EmailAddressPage::submit()
{
    if (input_.empty()) {
        if (state_->db.deleteKV(radiantwave::db::KV_EMAIL_ADDRESS)) {
            storedValue_.clear();
            statusMessage_ = "Cleared";
            returnTimer_ = 1.0f;
            // The credential pair changed: re-validate in the background.
            state_->licenseTracker.refresh();
        } else {
            statusMessage_ = "Failed to clear email address";
        }
        return;
    }

    if (!radiantwave::validation::isValidEmail(input_)) {
        statusMessage_ = "Invalid email address";
        return;
    }

    if (state_->db.setKV(radiantwave::db::KV_EMAIL_ADDRESS, input_)) {
        storedValue_ = input_;
        statusMessage_ = "Saved";
        returnTimer_ = 1.0f;
        // The credential pair changed: re-validate in the background.
        state_->licenseTracker.refresh();
    } else {
        statusMessage_ = "Failed to save email address";
    }
}

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

    if (event.type == SDL_EVENT_TEXT_INPUT) {
        if (input_.size() < MAX_EMAIL_LENGTH) {
            input_ += event.text.text;
        }
        return;
    }

    if (event.type == SDL_EVENT_KEY_DOWN) {
        SDL_Keycode key = event.key.key;

        if (key == SDLK_BACKSPACE) {
            if (!input_.empty()) {
                input_.pop_back();
            }
        } else if (key == SDLK_RETURN || key == SDLK_KP_ENTER) {
            submit();
        } else if (key == SDLK_ESCAPE) {
            exitPage(*state_);
        }
    }
}

void EmailAddressPage::update(float dt)
{
    if (returnTimer_ > 0.0f) {
        returnTimer_ -= dt;
        if (returnTimer_ <= 0.0f) {
            returnTimer_ = -1.0f;
            if (state_) {
                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 EmailAddressPage::exitPage(AppState& state)
{
    if (state.provisioningMode) {
        radiantwave::provisioning::advance(state);
    } else {
        state.pages.pop(state);
    }
}

void EmailAddressPage::render(SDL_Renderer* renderer)
{
    int winW, winH;
    radiantwave::getLayoutSize(renderer, &winW, &winH);
    float fw = static_cast<float>(winW);
    float fh = static_cast<float>(winH);

    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 yellow = {255, 255, 0, 255};
    SDL_Color cyan = {100, 220, 255, 255};
    SDL_Color gray = {180, 180, 180, 255};

    float currentY = 30.0f;

    // Input box (centered on screen); messages align to its left edge
    float boxW = 700.0f;
    float boxH = 70.0f;
    float boxX = (fw - boxW) / 2.0f;

    titleText_.ensure(renderer, fontTitle_, "Email Address", 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 + 30.0f;
    }

    std::string storedStr = storedValue_.empty() ? "Not set" : storedValue_;
    storedText_.ensure(renderer, fontHeader_, "Saved: " + storedStr,
                       storedValue_.empty() ? gray : yellow);
    if (storedText_.texture) {
        SDL_FRect dst{boxX, currentY, storedText_.width, storedText_.height};
        SDL_RenderTexture(renderer, storedText_.texture, nullptr, &dst);
    }
    currentY += 50.0f;

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

    std::string display = input_ + "_";
    valueText_.ensure(renderer, fontBody_, display, cyan);
    if (valueText_.texture) {
        SDL_FRect dst{boxX + 20.0f, currentY + (boxH - valueText_.height) / 2.0f, valueText_.width, valueText_.height};
        SDL_RenderTexture(renderer, valueText_.texture, nullptr, &dst);
    }
    currentY += boxH + 30.0f;

    // Status message (left-aligned with input box)
    if (!statusMessage_.empty()) {
        statusText_.ensure(renderer, fontHeader_, statusMessage_, gray);
        if (statusText_.texture) {
            SDL_FRect dst{boxX, currentY, statusText_.width, statusText_.height};
            SDL_RenderTexture(renderer, statusText_.texture, nullptr, &dst);
        }
        currentY += 50.0f;
    }

    hintText_.ensure(renderer, fontSmall_,
        "[Type] Enter email    [ENTER] Save    [BACKSPACE] Delete    [ESC] Back", gray);
    if (hintText_.texture) {
        float x = (fw - hintText_.width) / 2.0f;
        SDL_FRect dst{x, fh - 40.0f, hintText_.width, hintText_.height};
        SDL_RenderTexture(renderer, hintText_.texture, nullptr, &dst);
    }
}