package appeng.spatial;

import java.time.Instant;

import net.minecraft.nbt.CompoundNBT;
import net.minecraft.nbt.NBTUtil;
import net.minecraft.util.ResourceLocation;
import net.minecraft.util.math.BlockPos;

/**
 * Defines the source world and area of a transition into the spatial storage
 * plot.
 */
public final class TransitionInfo {

    public static final String TAG_WORLD_ID = "world_id";
    public static final String TAG_MIN = "min";
    public static final String TAG_MAX = "max";
    public static final String TAG_TIMESTAMP = "timestamp";

    private final ResourceLocation worldId;

    private final BlockPos min;

    private final BlockPos max;

    private final Instant timestamp;

    public TransitionInfo(ResourceLocation worldId, BlockPos min, BlockPos max, Instant timestamp) {
        this.worldId = worldId;
        this.min = min.toImmutable();
        this.max = max.toImmutable();
        this.timestamp = timestamp;
    }

    public ResourceLocation getWorldId() {
        return worldId;
    }

    public BlockPos getMin() {
        return min;
    }

    public BlockPos getMax() {
        return max;
    }

    public Instant getTimestamp() {
        return timestamp;
    }

    public CompoundNBT toTag() {
        CompoundNBT tag = new CompoundNBT();
        tag.putString(TAG_WORLD_ID, worldId.toString());
        tag.put(TAG_MIN, NBTUtil.writeBlockPos(min));
        tag.put(TAG_MAX, NBTUtil.writeBlockPos(max));
        tag.putLong(TAG_TIMESTAMP, timestamp.toEpochMilli());
        return tag;
    }

    public static TransitionInfo fromTag(CompoundNBT tag) {
        ResourceLocation worldId = new ResourceLocation(tag.getString(TAG_WORLD_ID));
        BlockPos min = NBTUtil.readBlockPos(tag.getCompound(TAG_MIN));
        BlockPos max = NBTUtil.readBlockPos(tag.getCompound(TAG_MAX));
        Instant timestamp = Instant.ofEpochMilli(tag.getLong(TAG_TIMESTAMP));
        return new TransitionInfo(worldId, min, max, timestamp);
    }

}