// Copyright (c) 2026 Stefan Koelle (https://stefankoelle.de) - MIT License
#include "home_screen.h"
#include <M5Stack.h>
#include "../../include/theme.h"
#include "../../include/text_utils.h"
#include "../../include/date_utils.h"
#include "../icons/icons.h"
#include "../api/weather_api.h"
#include "../api/calendar_api.h"

namespace {
    WeatherData lastWeather;
    CalendarData lastCalendar;
    bool weatherOk = false;
    bool calendarOk = false;
    unsigned long lastFetchMs = 0;
    const unsigned long REFRESH_INTERVAL_MS = 10UL * 60UL * 1000UL;

    void doFetch() {
        WeatherData w = fetchWeather();
        weatherOk = w.valid;
        if (w.valid) lastWeather = w;
        CalendarData c = fetchCalendar();
        calendarOk = c.valid;
        if (c.valid) lastCalendar = c;
        lastFetchMs = millis();
    }

    void drawErrorState(int x, int y, const char *label) {
        Icons::drawRetryIcon(x, y, 10);
        M5.Lcd.setTextColor(Theme::TEXT_DIM, Theme::BG);
        M5.Lcd.setCursor(x + 20, y - 5);
        M5.Lcd.print(label);
    }
}

void updateHomeScreen() {
    if (lastFetchMs == 0 || millis() - lastFetchMs >= REFRESH_INTERVAL_MS) doFetch();
}

void renderHomeScreen(bool forceRefresh) {
    if (forceRefresh || lastFetchMs == 0) doFetch();

    M5.Lcd.fillScreen(Theme::BG);

    if (weatherOk) {
        Icons::drawWeatherIcon(lastWeather.current.symbol, lastWeather.current.description, 45, 55, 24);

        M5.Lcd.setTextColor(Theme::TEXT, Theme::BG);
        M5.Lcd.setTextSize(4);
        M5.Lcd.setCursor(90, 30);
        M5.Lcd.printf("%d", lastWeather.current.temperature);
        M5.Lcd.setTextSize(2);
        M5.Lcd.print(" C");

        M5.Lcd.setTextSize(2);
        M5.Lcd.setTextColor(Theme::TEXT_DIM, Theme::BG);
        M5.Lcd.setCursor(90, 65);
        M5.Lcd.print(sanitizeGermanText(lastWeather.current.description));

        if (lastWeather.willRainSoon) {
            Icons::drawRainWarning(280, 30);
            M5.Lcd.setTextColor(Theme::ACCENT_RAIN, Theme::BG);
            M5.Lcd.setTextSize(1);
            M5.Lcd.setCursor(220, 45);
            M5.Lcd.print("Regen moeglich");
        }
    } else {
        drawErrorState(20, 40, "Wetter n.a.");
    }

    M5.Lcd.drawFastHLine(10, 95, Theme::SCREEN_W - 20, Theme::BG_CARD);

    Icons::drawCalendarIcon(20, 112, 16);
    M5.Lcd.setTextColor(Theme::TEXT, Theme::BG);
    M5.Lcd.setTextSize(2);
    M5.Lcd.setCursor(38, 104);
    M5.Lcd.print("Termine");

    if (calendarOk) {
        int y = 135;
        int shown = 0;
        for (const auto &ev : lastCalendar.events) {
            if (shown >= 2) break;
            M5.Lcd.setTextColor(Theme::TEXT, Theme::BG);
            M5.Lcd.setTextSize(2);
            M5.Lcd.setCursor(10, y);
            M5.Lcd.print(sanitizeGermanText(ev.summary.substring(0, 20)));

            M5.Lcd.setTextColor(Theme::TEXT_DIM, Theme::BG);
            M5.Lcd.setTextSize(1);
            M5.Lcd.setCursor(10, y + 20);
            M5.Lcd.print(DateUtils::formatShortDE(ev.startAt, ev.allDay));

            y += 42;
            shown++;
        }
    } else {
        drawErrorState(20, 150, "Kalender n.a.");
    }

    M5.Lcd.setTextColor(Theme::TEXT_DIM, Theme::BG);
    M5.Lcd.setTextSize(1);
    M5.Lcd.setCursor(10, 225);
    M5.Lcd.print("A:Wetter/Kalender  B:Home  C:MVG");
}