feat: Add a proper color parser

app/src/main/java/com/p_vacho/neat_calendar/api/RetrofitClient.kt

@@ -1,6 +1,7 @@
 package com.p_vacho.neat_calendar.api
 
 import android.content.Context
+import android.graphics.Color
 import android.util.Log
 import com.google.gson.GsonBuilder
 import com.p_vacho.neat_calendar.api.services.AuthService
@@ -14,6 +15,7 @@ import retrofit2.HttpException
 import java.io.IOException
 import java.time.OffsetDateTime
 import com.fatboyindustrial.gsonjavatime.OffsetDateTimeConverter
+import com.p_vacho.neat_calendar.api.converters.ColorConverter
 import com.p_vacho.neat_calendar.api.services.EventsService
 
 object RetrofitClient {
@@ -73,6 +75,7 @@ object RetrofitClient {
 
         val gson = GsonBuilder()
             .registerTypeAdapter(OffsetDateTime::class.java, OffsetDateTimeConverter())
+            .registerTypeAdapter(Color::class.java, ColorConverter())
             .create()
 
         return Retrofit.Builder()

app/src/main/java/com/p_vacho/neat_calendar/api/converters/ColorConverter.kt

@@ -0,0 +1,81 @@
+package com.p_vacho.neat_calendar.api.converters
+
+import android.graphics.Color
+import android.util.Log
+import com.google.gson.*
+import java.lang.reflect.Type
+import kotlinx.parcelize.Parceler
+
+
+class ColorConverter : JsonDeserializer<Color>, JsonSerializer<Color> {
+
+    @Throws(JsonParseException::class)
+    override fun deserialize(json: JsonElement, typeOfT: Type, context: JsonDeserializationContext): Color {
+        val colorString = json.asString
+        try {
+            validateColor(colorString) // Ensure the color is in a valid format
+            return parseColorToAndroidFormat(colorString) // Convert to a Color object
+        } catch (e: IllegalArgumentException) {
+            throw JsonParseException("Invalid color format: $colorString", e)
+        }
+    }
+
+    override fun serialize(src: Color, typeOfSrc: Type, context: JsonSerializationContext): JsonElement {
+        // Convert Color object back to #RRGGBB or #RRGGBBAA
+        return JsonPrimitive(colorToApiFormat(src))
+    }
+
+    /**
+     * Validates the color string to ensure it matches the #RRGGBB or #RRGGBBAA format.
+     */
+    private fun validateColor(color: String) {
+        val regex = Regex("^#[A-Fa-f0-9]{6}([A-Fa-f0-9]{2})?$")
+        if (!regex.matches(color)) {
+            throw IllegalArgumentException("Invalid color string: $color. Must be in #RRGGBB or #RRGGBBAA format.")
+        }
+    }
+
+    /**
+     * Converts a #RRGGBBAA / #RRGGBB color string to a Color object.
+     */
+    private fun parseColorToAndroidFormat(color: String): Color {
+        val colorInt = if (color.length == 9) {
+            // Convert #RRGGBBAA to #AARRGGBB
+            Color.parseColor("#${color.substring(7, 9)}${color.substring(1, 7)}")
+        } else {
+            // Already in #RRGGBB format
+            Color.parseColor(color)
+        }
+        return Color.valueOf(colorInt)
+    }
+
+    /**
+     * Converts a Color object to a #RRGGBB or #RRGGBBAA string for API use.
+     */
+    private fun colorToApiFormat(color: Color): String {
+        val argb = color.toArgb() // Get ARGB as a single integer
+        val alpha = Color.alpha(argb)
+        val red = Color.red(argb)
+        val green = Color.green(argb)
+        val blue = Color.blue(argb)
+
+        return if (alpha < 255) {
+            // Include alpha if not fully opaque
+            String.format("#%02X%02X%02X%02X", red, green, blue, alpha)
+        } else {
+            // Exclude alpha if fully opaque
+            String.format("#%02X%02X%02X", red, green, blue)
+        }
+    }
+}
+
+object ColorParceler : Parceler<Color> {
+    override fun create(parcel: android.os.Parcel): Color {
+        val colorInt = parcel.readInt()
+        return Color.valueOf(colorInt)
+    }
+
+    override fun Color.write(parcel: android.os.Parcel, flags: Int) {
+        parcel.writeInt(this.toArgb())
+    }
+}

app/src/main/java/com/p_vacho/neat_calendar/api/models/EventModels.kt

@@ -1,10 +1,14 @@
 package com.p_vacho.neat_calendar.api.models
 
+import android.graphics.Color
 import android.os.Parcelable
+import com.p_vacho.neat_calendar.api.converters.ColorParceler
 import kotlinx.parcelize.Parcelize
+import kotlinx.parcelize.TypeParceler
 import java.time.OffsetDateTime
 
 @Parcelize
+@TypeParceler<Color, ColorParceler>
 data class EventResponse(
     val id: String,
     val title: String,
@@ -12,7 +16,7 @@ data class EventResponse(
     val category_ids: List<String>,
     val start_time: OffsetDateTime,
     val end_time: OffsetDateTime,
-    val color: String, // Hex color (e.g., #ff0000)
+    val color: Color,
     val owner_user_id: String,
     val attendee_ids: List<String>,
     val created_at: OffsetDateTime