import { omit } from 'lodash'
import { INode, INodeData, INodeParams } from '../../../src/Interface'
import { TextSplitter } from 'langchain/text_splitter'
import { GitbookLoader } from 'langchain/document_loaders/web/gitbook'

class Gitbook_DocumentLoaders implements INode {
    label: string
    name: string
    version: number
    description: string
    type: string
    icon: string
    category: string
    baseClasses: string[]
    inputs?: INodeParams[]

    constructor() {
        this.label = 'GitBook'
        this.name = 'gitbook'
        this.version = 1.0
        this.type = 'Document'
        this.icon = 'gitbook.svg'
        this.category = 'Document Loaders'
        this.description = `Load data from GitBook`
        this.baseClasses = [this.type]
        this.inputs = [
            {
                label: 'Web Path',
                name: 'webPath',
                type: 'string',
                placeholder: 'https://docs.gitbook.com/product-tour/navigation',
                description: 'If want to load all paths from the GitBook provide only root path e.g.https://docs.gitbook.com/ '
            },
            {
                label: 'Should Load All Paths',
                name: 'shouldLoadAllPaths',
                type: 'boolean',
                description: 'Load from all paths in a given GitBook',
                optional: true
            },
            {
                label: 'Text Splitter',
                name: 'textSplitter',
                type: 'TextSplitter',
                optional: true
            },
            {
                label: 'Additional Metadata',
                name: 'metadata',
                type: 'json',
                description: 'Additional metadata to be added to the extracted documents',
                optional: true,
                additionalParams: true
            },
            {
                label: 'Omit Metadata Keys',
                name: 'omitMetadataKeys',
                type: 'string',
                rows: 4,
                description:
                    'Each document loader comes with a default set of metadata keys that are extracted from the document. You can use this field to omit some of the default metadata keys. The value should be a list of keys, seperated by comma',
                placeholder: 'key1, key2, key3.nestedKey1',
                optional: true,
                additionalParams: true
            }
        ]
    }
    async init(nodeData: INodeData): Promise<any> {
        const webPath = nodeData.inputs?.webPath as string
        const shouldLoadAllPaths = nodeData.inputs?.shouldLoadAllPaths as boolean
        const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
        const metadata = nodeData.inputs?.metadata
        const _omitMetadataKeys = nodeData.inputs?.omitMetadataKeys as string

        let omitMetadataKeys: string[] = []
        if (_omitMetadataKeys) {
            omitMetadataKeys = _omitMetadataKeys.split(',').map((key) => key.trim())
        }

        const loader = shouldLoadAllPaths ? new GitbookLoader(webPath, { shouldLoadAllPaths }) : new GitbookLoader(webPath)

        let docs = textSplitter ? await loader.loadAndSplit() : await loader.load()

        if (metadata) {
            const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
            docs = docs.map((doc) => ({
                ...doc,
                metadata: omit(
                    {
                        ...doc.metadata,
                        ...parsedMetadata
                    },
                    omitMetadataKeys
                )
            }))
        } else {
            docs = docs.map((doc) => ({
                ...doc,
                metadata: omit(
                    {
                        ...doc.metadata
                    },
                    omitMetadataKeys
                )
            }))
        }

        return docs
    }
}

module.exports = {
    nodeClass: Gitbook_DocumentLoaders
}