import { World } from './world';
import { PlayerEntity } from './entity';
import { Identifier, Hand, Pos, ActionResult, Direction, SimpleRegistry } from './core';
import { CompoundTag } from './tag';
import { useBridge, addBridge } from 'scriptcraft-core';
import { Inventory } from './inventory';

/**
 * Settings for {@link CustomBlock}
 */
export class BlockSettings {
    readonly #material: string;
    readonly #materialColor: string;

    #resistance: number;
    #hardness: number;

    /**
     * Create Block Settings
     * @param material Material
     * @param materialColor Material Color
     */
    constructor(material: string);
    constructor(material: string, materialColor: string);
    constructor(material: string, materialColor?: string) {
        this.#material = material;
        this.#materialColor = materialColor;

        this.#resistance = 0;
        this.#hardness = 0;
    }

    /**
     * Set Block Strength
     * @param hardness Hardness Value
     * @param resistance Blast Resistance Value
     */
    setStrength(hardness: number, resistance: number): BlockSettings {
        this.#hardness = hardness;
        this.#resistance = resistance;
        return this;
    }

    /**
     * Set Hardness
     * @param hardness Hardness Value
     */
    setHardness(hardness: number): BlockSettings {
        this.#hardness = hardness;
        return this;
    }

    /**
     * Set Blast Resistance
     * @param resistance Blast Resistance Value
     */
    setResistance(resistance: number): BlockSettings {
        this.#resistance = resistance;
        return this;
    }

    /**
     * @internal
     */
    createJavaObject(): JavaObject {
        return useBridge('BlockSettings.create', this.#material, this.#materialColor, this.#hardness, this.#resistance) as JavaObject;
    }
}

/**
 * Custom Block
 */
export class CustomBlock {
    /**
     * @internal
     */
    readonly settings: BlockSettings;

    /**
     * Create Custom Block
     * @param settings Block Settings
     */
    constructor(settings: BlockSettings) {
        this.settings = settings;
    }

    /**
     * Called When The Block Is Used
     * @param world World
     * @param blockState Block State
     * @param pos Block Position
     * @param side Side Of The Block Used
     * @param player Player
     * @param hand Hand
     * @returns Action Result
     */
    onUse(world: World, blockState: BlockState, pos: Pos, side: Direction, player: PlayerEntity, hand: Hand): ActionResult {
        return ActionResult.PASS;
    }
}

/**
 * Custom Block Entity
 */
export class CustomBlockEntity {
    /**
     * World
     */
    protected world: World;
    /**
     * Position
     */
    protected pos: Pos;

    /**
     * Set Location
     * @param world New World
     * @param pos New Position
     */
    setLocation(world: World, pos: Pos): void {
        this.world = world;
        this.pos = pos;
    }

    /**
     * Save Data To Tag
     * @param tag Tag
     * @returns Tag
     */
    toTag(tag: CompoundTag): CompoundTag {
        return tag;
    }

    /**
     * Load Data From Tag
     * @param tag Tag
     */
    fromTag(tag: CompoundTag): void {}

    /**
     * Runs Every Tick
     */
    tick(): void {}

    /**
     * Get World
     * @returns World
     */
    getWorld(): World {
        return this.world;
    }

    /**
     * Get Position
     * @returns Position
     */
    getPos(): Pos {
        return this.pos;
    }

    /**
     * Mark Dirty
     */
    markDirty(): void {
        if (this.getWorld() !== null) {
            const entity = this.getWorld().getBlockEntity(this.getPos());
            if (entity !== null) {
                entity.markDirty();
            }
        }
    }
}

/**
 * Block State
 */
export class BlockState {
    /**
     * @internal
     */
    readonly javaObject: JavaObject;

    /**
     * @internal
     */
    constructor(javaObject: JavaObject) {
        this.javaObject = javaObject;
    }

    /**
     * Get Default Block State for Block
     * @param block Block ID
     * @returns Default Block State
     */
    static getDefaultState(block: Identifier): BlockState {
        const obj = useBridge('BlockState.getDefaultState', block.toString()) as JavaObject;
        if (obj) {
            return new BlockState(obj);
        } else {
            return null;
        }
    }

    /**
     * Get Block ID
     * @returns Block ID
     */
    getBlock(): Identifier {
        const obj = useBridge('BlockState.getBlock', this.javaObject) as string;
        if (obj) {
            return new Identifier(obj);
        } else {
            return null;
        }
    }

    /**
     * Get Custom Block
     * @returns Custom Block
     */
    getCustomBlock(): CustomBlock {
        const id = this.getBlock();
        return BlockRegistry.INSTANCE.get(id);
    }
}

/**
 * Block Entity
 */
export class BlockEntity {
    /**
     * @internal
     */
    readonly javaObject: JavaObject;

    /**
     * @internal
     */
    constructor(object: JavaObject) {
        this.javaObject = object;
    }

    /**
     * Get Block Entity ID
     * @returns ID
     */
    getID(): Identifier {
        const obj = useBridge('BlockEntity.getID', this.javaObject) as string;
        if (obj !== null) {
            return new Identifier(obj);
        } else {
            return null;
        }
    }

    /**
     * Get Block Entity Inventory
     * @returns Inventory If Block Entity Has One, Otherwise NULL
     */
    getInventory(): Inventory {
        const obj = useBridge('BlockEntity.getInventory', this.javaObject) as JavaObject;
        if (obj !== null) {
            return new Inventory(obj);
        } else {
            return null;
        }
    }

    /**
     * Mark Dirty
     */
    markDirty(): void {
        useBridge('BlockEntity.markDirty', this.javaObject);
    }
}

/**
 * {@link CustomBlock} With {@link CustomBlockEntity}
 */
export class CustomBlockWithEntity extends CustomBlock {
    /**
     * Create Custom Block Entity
     * @returns Custom Block Entity
     */
    createBlockEntity(): CustomBlockEntity {
        throw new Error('CustomBlockWithEntity.createBlockEntity is not implemented');
    }
}

/**
 * @internal
 */
export class BlockRegistry implements SimpleRegistry<CustomBlock> {
    static readonly INSTANCE = new BlockRegistry();

    readonly #blocks: Map<string, CustomBlock>;

    readonly #blockEntities: CustomBlockEntity[];

    private constructor() {
        this.#blocks = new Map<string, CustomBlock>();
        this.#blockEntities = [];
    }

    register(id: Identifier, obj: CustomBlock): void {
        this.#blocks.set(id.toString(), obj);
        if (obj instanceof CustomBlockWithEntity) {
            useBridge('Registry.registerBlockWithEntity', id.toString(), obj.settings.createJavaObject());
        } else {
            useBridge('Registry.registerBlock', id.toString(), obj.settings.createJavaObject());
        }
    }

    get(id: Identifier): CustomBlock {
        return this.#blocks.get(id.toString());
    }

    getID(obj: CustomBlock): Identifier {
        for (const block of this.#blocks) {
            if (block[1] === obj) {
                return new Identifier(block[0]);
            }
        }
        return null;
    }

    getCustomBlockEntity(i: number): CustomBlockEntity {
        return this.#blockEntities[i];
    }

    getCustomBlockEntities(): CustomBlockEntity[] {
        return this.#blockEntities;
    }

    createCustomBlockEntity(id: Identifier, i: number): void {
        const block = this.get(id) as CustomBlockWithEntity;
        this.#blockEntities[i] = block.createBlockEntity();
    }

    freeCustomBlockEntity(i: number): void {
        delete this.#blockEntities[i];
    }
}

addBridge('CustomBlockEntity.create', (id: string, i: number) => {
    BlockRegistry.INSTANCE.createCustomBlockEntity(new Identifier(id), i);
});

addBridge('CustomBlockEntity.fromTag', (i: number, tag: JavaObject) => {
    BlockRegistry.INSTANCE.getCustomBlockEntity(i).fromTag(new CompoundTag(tag));
});

addBridge('CustomBlockEntity.toTag', (i: number, tag: JavaObject): JavaObject => {
    return BlockRegistry.INSTANCE.getCustomBlockEntity(i).toTag(new CompoundTag(tag)).javaObject;
});

addBridge('CustomBlockEntity.tick', (i: number) => {
    BlockRegistry.INSTANCE.getCustomBlockEntity(i).tick();
});

addBridge('CustomBlockEntity.setLocation', (i: number, world: JavaObject, x: number, y: number, z: number) => {
    BlockRegistry.INSTANCE.getCustomBlockEntity(i).setLocation(new World(world), new Pos(x, y, z));
});

addBridge('CustomBlockEntity.free', (i: number) => {
    BlockRegistry.INSTANCE.freeCustomBlockEntity(i);
});

addBridge('CustomBlock.onUse', (id: string, world: JavaObject, state: JavaObject, x: number, y: number, z: number, side: keyof typeof Direction, player: JavaObject, hand: keyof typeof Hand): string => {
    return BlockRegistry.INSTANCE.get(new Identifier(id)).onUse(new World(world), new BlockState(state), new Pos(x, y, z), Direction[side], new PlayerEntity(player), Hand[hand]);
});