import { ValidationError } from "../ValidationError.js";

export class DnsTool {
	static fields = [];

	constructor(text) {
		this.text = text;
	}

	getKeyValues() {
		throw new Error("Unimplemented");
	}

	validate() {
		const values = this.getKeyValues();

		// Validate field order
		for (const field of this.constructor.fields) {
			const valueIdx = values.findIndex(v => v.key === field.key);

			if (field.isRequired && valueIdx === -1) {
				throw new ValidationError(`Field "${field.key}" is required`);
			}

			if (field.requiredIndex && field.requiredIndex !== valueIdx) {
				if (field.requiredIndex === 0) throw new ValidationError(`Field "${field.key}" must come first`);
				if (field.afterFieldName) throw new ValidationError(`Field "${field.key}" must come after "${field.afterFieldName}"`);
				throw new ValidationError(`Field "${field.key}" must be at position ${field.requiredIndex + 1}`);
			}
		}

		// Validate field values
		for (let i = 0; i < values.length; i++) {
			const input = values[i];
			const field = this.constructor.fields.find(f => f.key === input.key);

			if (!field) {
				throw new ValidationError(`Unknown field: ${input.key}`)
			}

			field.validate(input.value);
		}

		return true;
	}
}