import {RuleConfigSeverity} from '@commitlint/types';
import type {Rule} from '../types.js';

export function ruleIsDisabled(
	rule: Rule
): rule is Readonly<[RuleConfigSeverity.Disabled]> {
	if (rule && Array.isArray(rule) && rule[0] === RuleConfigSeverity.Disabled) {
		return true;
	}
	return false;
}

/**
 * Check if a rule definition is active
 * @param rule to check
 * @return if the rule definition is active
 */
export function ruleIsActive<T extends Rule>(
	rule: T
): rule is Exclude<T, Readonly<[RuleConfigSeverity.Disabled]>> {
	if (rule && Array.isArray(rule)) {
		return rule[0] > RuleConfigSeverity.Disabled;
	}
	return false;
}

/**
 * Check if a rule definition is applicable
 * @param rule to check
 * @return if the rule definition is applicable
 */
export function ruleIsApplicable(
	rule: Rule
): rule is
	| Readonly<[RuleConfigSeverity, 'always']>
	| Readonly<[RuleConfigSeverity, 'always', unknown]> {
	if (rule && Array.isArray(rule)) {
		return rule[1] === 'always';
	}
	return false;
}

/**
 * Check if a rule definition is applicable
 * @param rule to check
 * @return if the rule definition is applicable
 */
export function ruleIsNotApplicable(
	rule: Rule
): rule is
	| Readonly<[RuleConfigSeverity, 'never']>
	| Readonly<[RuleConfigSeverity, 'never', unknown]> {
	if (rule && Array.isArray(rule)) {
		return rule[1] === 'never';
	}
	return false;
}

export function enumRuleIsActive(
	rule: Rule
): rule is Readonly<
	[RuleConfigSeverity.Warning | RuleConfigSeverity.Error, 'always', string[]]
> {
	return (
		ruleIsActive(rule) &&
		ruleIsApplicable(rule) &&
		Array.isArray(rule[2]) &&
		rule[2].length > 0
	);
}

export function getEnumList(rule: Rule): string[] {
	return Array.isArray(rule[2]) ? rule[2] : [];
}

export function getMaxLength(rule?: Rule): number {
	if (
		rule &&
		ruleIsActive(rule) &&
		ruleIsApplicable(rule) &&
		typeof rule[2] === 'number'
	) {
		return rule[2];
	}
	return Infinity;
}

export function getMinLength(rule?: Rule): number {
	if (
		rule &&
		ruleIsActive(rule) &&
		ruleIsApplicable(rule) &&
		typeof rule[2] === 'number'
	) {
		return rule[2];
	}
	return 0;
}