const { MCPServer } = require("@modelcontextprotocol/core")

class DataProcessor extends MCPServer {
	constructor() {
		super({
			name: "Data Processor",
			description: "Processes and transforms data files",
			version: "1.0.0",
			capabilities: ["file-processing", "data-transformation"],
		})

		this.registerHandler("process-file", this.processFile.bind(this))
		this.registerHandler("transform-data", this.transformData.bind(this))
	}

	async processFile(context, params) {
		const { filePath, options } = params

		// Validate parameters
		if (!filePath) {
			throw new Error("File path is required")
		}

		try {
			// Read file content
			const content = await context.readFile(filePath)

			// Process based on file type
			const fileType = this.detectFileType(filePath)
			const processedData = await this.processContent(content, fileType, options)

			return {
				success: true,
				data: processedData,
				metadata: {
					fileType,
					processedAt: new Date().toISOString(),
					rowCount: processedData.length,
				},
			}
		} catch (error) {
			return {
				success: false,
				error: error.message,
			}
		}
	}

	async transformData(context, params) {
		const { data, transformations } = params

		// Validate parameters
		if (!data || !transformations) {
			throw new Error("Data and transformations are required")
		}

		try {
			let transformedData = data

			// Apply each transformation in sequence
			for (const transform of transformations) {
				transformedData = await this.applyTransformation(transformedData, transform)
			}

			return {
				success: true,
				data: transformedData,
				metadata: {
					transformations: transformations.map((t) => t.type),
					transformedAt: new Date().toISOString(),
				},
			}
		} catch (error) {
			return {
				success: false,
				error: error.message,
			}
		}
	}

	detectFileType(filePath) {
		const extension = filePath.split(".").pop().toLowerCase()
		const fileTypes = {
			csv: "CSV",
			json: "JSON",
			xml: "XML",
			xlsx: "Excel",
			parquet: "Parquet",
		}
		return fileTypes[extension] || "Unknown"
	}

	async processContent(content, fileType, options = {}) {
		// Implementation would handle different file types
		switch (fileType) {
			case "CSV":
				return this.processCSV(content, options)
			case "JSON":
				return this.processJSON(content, options)
			case "XML":
				return this.processXML(content, options)
			default:
				throw new Error(`Unsupported file type: ${fileType}`)
		}
	}

	async applyTransformation(data, transform) {
		// Implementation would handle different transformation types
		switch (transform.type) {
			case "filter":
				return data.filter(transform.condition)
			case "map":
				return data.map(transform.mapper)
			case "aggregate":
				return this.aggregate(data, transform.aggregation)
			default:
				throw new Error(`Unsupported transformation: ${transform.type}`)
		}
	}

	// Helper methods for specific file types
	processCSV(content, options) {
		// CSV processing implementation
		return []
	}

	processJSON(content, options) {
		// JSON processing implementation
		return []
	}

	processXML(content, options) {
		// XML processing implementation
		return []
	}

	aggregate(data, aggregation) {
		// Aggregation implementation
		return {}
	}
}

module.exports = new DataProcessor()
