import {
    ISdtfWriteableAsset,
    ISdtfWriteableAttributes,
    ISdtfWriteableComponentFactory,
    ISdtfWriteableDataItem,
    isIntArray,
    SdtfError,
} from '@shapediver/sdk.sdtf-core';
import {
    ISdtfGrasshopperSdtfBuilder,
    ISdtfGrasshopperStructure,
} from './ISdtfGrasshopperSdtfBuilder';

export class SdtfGrasshopperSdtfBuilder implements ISdtfGrasshopperSdtfBuilder {
    private readonly asset: ISdtfWriteableAsset;

    constructor(private readonly factory: ISdtfWriteableComponentFactory) {
        this.asset = factory.createAsset();
    }

    addChunkForListData(
        parameterId: string,
        list: ISdtfWriteableDataItem[],
        chunkAttributes?: ISdtfWriteableAttributes
    ): void {
        this.addChunkForTreeData(parameterId, { branches: [list], paths: [[0]] }, chunkAttributes);
    }

    addChunkForTreeData(
        parameterId: string,
        tree: ISdtfGrasshopperStructure,
        chunkAttributes?: ISdtfWriteableAttributes
    ): void {
        const chunk = this.factory.createChunk(parameterId);
        this.asset.chunks.push(chunk);

        // Add chunk attributes if given
        if (chunkAttributes) chunk.attributes = chunkAttributes;

        // Validate grasshopper structure - `branches` and `paths` must have the same number of elements (first array level).
        if (tree.branches.length !== tree.paths.length)
            throw new SdtfError(
                "Invalid tree parameter: 'branches' and 'paths' of the grasshopper structure must have the same number of elements."
            );

        // Validate grasshopper structure - The numbers in `paths` must all be integers.
        if (!tree.paths.every((path) => isIntArray(path)))
            throw new SdtfError(
                "Invalid tree parameter: 'paths' of the grasshopper structure must only consist of integer values."
            );

        // Validate grasshopper structure - All data items must contain a type hint.
        if (!tree.branches.every((branch) => branch.every((item) => !!item.typeHint?.name)))
            throw new SdtfError(
                "Invalid tree parameter: All data items in 'tree.branches' must contain a type hint."
            );

        let typeHint: string | undefined;

        // Create nodes according to the given grasshopper tree structure
        for (let i = 0; i < tree.branches.length; i++) {
            const branch = tree.branches[i],
                path = tree.paths[i];

            const node = this.factory.createNode();
            // The numbers in path represent the name of the node
            node.name = '[' + path.join(',') + ']';

            // The branch holds all data of the node
            branch.forEach((item) => {
                // The first data item sets the required type hint
                if (!typeHint) typeHint = item.typeHint!.name;

                // Validate grasshopper structure - All data items must have the same type hint.
                if (typeHint !== item.typeHint!.name)
                    throw new SdtfError(
                        "Invalid tree parameter: All data items in 'tree.branches' must have the same type hint."
                    );

                // Add item to node
                node.items.push(item);
            });

            chunk.nodes.push(node);
        }
    }

    build(): ISdtfWriteableAsset {
        return this.asset;
    }
}