Add WeatherForecastService with a mock data

src/main/kotlin/org/jetbrains/plugins/template/weatherApp/services/WeatherForecastService.kt

@@ -0,0 +1,55 @@
+package org.jetbrains.plugins.template.weatherApp.services
+
+import com.intellij.openapi.components.Service
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.launch
+import org.jetbrains.plugins.template.weatherApp.model.Location
+import org.jetbrains.plugins.template.weatherApp.model.WeatherForecastData
+import org.jetbrains.plugins.template.weatherApp.model.WeatherType
+import org.jetbrains.plugins.template.weatherApp.model.WindDirection
+import java.time.LocalDateTime
+
+@Service
+internal class WeatherForecastService(private val cs: CoroutineScope) {
+    private val _weatherForecast: MutableStateFlow<WeatherForecastData> = MutableStateFlow(WeatherForecastData.EMPTY)
+
+    val weatherForecast: StateFlow<WeatherForecastData> = _weatherForecast.asStateFlow()
+
+    fun loadWeatherForecastFor(location: Location) {
+        cs.launch(Dispatchers.IO) {
+            // TODO Cache data
+            emit(getWeatherData(location))
+        }
+    }
+
+    private fun emit(weatherData: WeatherForecastData) {
+        _weatherForecast.value = weatherData
+    }
+
+    /**
+     * Provides mock weather data for demonstration purposes.
+     * In a real application, this would fetch data from a weather API.
+     */
+    private suspend fun getWeatherData(location: Location): WeatherForecastData {
+        val temperature = (-10..40).random().toFloat()
+        val windSpeed = (0..30).random().toFloat()
+        val humidity = (30..90).random()
+
+        delay(100)
+
+        return WeatherForecastData(
+            cityName = location.name,
+            temperature = temperature,
+            currentTime = LocalDateTime.now(),
+            windSpeed = windSpeed,
+            windDirection = WindDirection.random(),
+            humidity = humidity,
+            weatherType = WeatherType.random()
+        )
+    }
+}