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

class DataValidator extends MCPServer {
	constructor() {
		super({
			name: "Data Validator",
			description: "Validates data quality and schema compliance",
			version: "1.0.0",
			capabilities: ["schema-validation", "data-quality", "rules-engine"],
		})

		this.registerHandler("validate-schema", this.validateSchema.bind(this))
		this.registerHandler("validate-quality", this.validateQuality.bind(this))
		this.registerHandler("validate-rules", this.validateRules.bind(this))
	}

	async validateSchema(context, params) {
		const { data, schema } = params

		if (!data || !schema) {
			throw new Error("Data and schema are required")
		}

		try {
			const validationResults = await this.performSchemaValidation(data, schema)
			return {
				success: validationResults.valid,
				errors: validationResults.errors,
				metadata: {
					schemaVersion: schema.version,
					validatedAt: new Date().toISOString(),
					recordCount: Array.isArray(data) ? data.length : 1,
				},
			}
		} catch (error) {
			return {
				success: false,
				error: error.message,
			}
		}
	}

	async validateQuality(context, params) {
		const { data, rules } = params

		if (!data || !rules) {
			throw new Error("Data and quality rules are required")
		}

		try {
			const qualityResults = await this.performQualityChecks(data, rules)
			return {
				success: qualityResults.passed,
				issues: qualityResults.issues,
				metrics: qualityResults.metrics,
				metadata: {
					rulesApplied: rules.length,
					checkedAt: new Date().toISOString(),
				},
			}
		} catch (error) {
			return {
				success: false,
				error: error.message,
			}
		}
	}

	async validateRules(context, params) {
		const { data, businessRules } = params

		if (!data || !businessRules) {
			throw new Error("Data and business rules are required")
		}

		try {
			const ruleResults = await this.evaluateBusinessRules(data, businessRules)
			return {
				success: ruleResults.passed,
				violations: ruleResults.violations,
				metadata: {
					rulesEvaluated: businessRules.length,
					evaluatedAt: new Date().toISOString(),
				},
			}
		} catch (error) {
			return {
				success: false,
				error: error.message,
			}
		}
	}

	async performSchemaValidation(data, schema) {
		// Implementation would validate data against the provided schema
		return {
			valid: true,
			errors: [],
		}
	}

	async performQualityChecks(data, rules) {
		// Implementation would check data quality based on rules
		return {
			passed: true,
			issues: [],
			metrics: {
				completeness: 100,
				accuracy: 100,
				consistency: 100,
			},
		}
	}

	async evaluateBusinessRules(data, rules) {
		// Implementation would evaluate business rules against the data
		return {
			passed: true,
			violations: [],
		}
	}
}

module.exports = new DataValidator()
