Travel_Run/Assets/Scripts/Maps/MapDatabase.cs

using UnityEngine;

public static class MapDatabase {
    private static MapDefinition[] maps;

    public static MapDefinition[] AllMaps {
        get {
            EnsureMaps();
            return maps;
        }
    }

    public static MapDefinition GetMap(MapId mapId) {
        EnsureMaps();

        for(int i = 0; i < maps.Length; i++)
        {
            if(maps[i].mapId == mapId)
            {
                return CloneMap(maps[i]);
            }
        }

        return CloneMap(maps[0]);
    }

    public static MapDefinition GetMapByIndex(int mapIndex) {
        EnsureMaps();
        int clampedIndex = Mathf.Clamp(mapIndex, 0, maps.Length - 1);
        return CloneMap(maps[clampedIndex]);
    }

    public static int GetIndex(MapId mapId) {
        EnsureMaps();

        for(int i = 0; i < maps.Length; i++)
        {
            if(maps[i].mapId == mapId)
            {
                return i;
            }
        }

        return 0;
    }

    public static int LastMapIndex {
        get {
            EnsureMaps();
            return maps.Length - 1;
        }
    }

    private static void EnsureMaps() {
        if(maps != null && maps.Length > 0)
        {
            return;
        }

        maps = new MapDefinition[] {
            TutorialIncheonMap.Create(),
            JapanMap.Create(),
            ChinaMap.Create(),
            AmericaMap.Create()
        };
    }

    private static MapDefinition CloneMap(MapDefinition source) {
        return new MapDefinition {
            mapId = source.mapId,
            displayName = source.displayName,
            routeName = source.routeName,
            isTutorial = source.isTutorial,
            platformSkin = source.platformSkin,
            backgroundResourcePath = source.backgroundResourcePath,
            finishGateStyle = source.finishGateStyle,
            targetDistance = source.targetDistance,
            timeLimit = source.timeLimit,
            clearMileageReward = source.clearMileageReward,
            hasNextMap = source.hasNextMap,
            nextMapId = source.nextMapId,
            openingSteps = CourseStepFactory.CloneSteps(source.openingSteps),
            loopSteps = CourseStepFactory.CloneSteps(source.loopSteps)
        };
    }
}