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Library that provides client access to the FIT-Connect api-endpoints for sending, subscribing and routing
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package dev.fitko.fitconnect.api.domain.validation;

import dev.fitko.fitconnect.api.domain.model.event.problems.Problem;
import dev.fitko.fitconnect.api.exceptions.internal.ValidationException;

import java.util.ArrayList;
import java.util.List;

/**
 * Wrapper for validations including an exception
 */
public final class ValidationResult {

    private final boolean isValid;
    private final Exception error;

    private final List validationProblems = new ArrayList<>();

    private ValidationResult(final boolean isValid) {
        this.isValid = isValid;
        error = null;
    }

    private ValidationResult(final boolean isValid, final Exception error) {
        this.isValid = isValid;
        this.error = error;
    }

    private ValidationResult(final Problem problem) {
        isValid = false;
        error = null;
        validationProblems.add(problem);
    }

    private ValidationResult(final List problems) {
        isValid = false;
        error = null;
        validationProblems.addAll(problems);
    }

    private ValidationResult(final Exception error, final Problem problem) {
        isValid = false;
        this.error = error;
        validationProblems.add(problem);
    }

    /**
     * Create new valid result.
     *
     * @return the valid result
     */
    public static ValidationResult ok() {
        return new ValidationResult(true);
    }

    /**
     * Create new failed result with an exception.
     *
     * @return the invalid result
     */
    public static ValidationResult error(final Exception exception) {
        return new ValidationResult(false, exception);
    }

    /**
     * Create new failed result with an error message that's wrapped in a ValidationException.
     *
     * @return the invalid result
     */
    public static ValidationResult error(final String errorMessage) {
        return new ValidationResult(false, new ValidationException(errorMessage));
    }

    /**
     * Create new failed result with a {@link Problem}.
     *
     * @return the invalid result
     */
    public static ValidationResult problem(final Problem problem) {
        return new ValidationResult(problem);
    }

    /**
     * Create new failed result with a list of {@link Problem}.
     *
     * @return the invalid result
     */
    public static ValidationResult problems(final List problems) {
        return new ValidationResult(problems);
    }

    /**
     * Create new failed result with an Exception and a {@link Problem}.
     *
     * @return the invalid result
     */
    public static ValidationResult withErrorAndProblem(final Exception exception, final Problem problem) {
        return new ValidationResult(exception, problem);
    }

    /**
     * Successful validation without errors.
     *
     * @return true if valid
     */
    public boolean isValid() {
        return isValid;
    }

    /**
     * Failed validation with an error.
     *
     * @return true if an error occurred
     */
    public boolean hasError() {
        return error != null;
    }

    /**
     * Failed validation with a problem error that gets auto-rejected.
     *
     * @return true if a problem occurred
     */
    public boolean hasProblems() {
        return !validationProblems.isEmpty();
    }

    /**
     * Gets the problem that was detected during validation.
     *
     * @return {@link Problem}
     */
    public List getProblems() {
        return validationProblems;
    }

    /**
     * Gets the exception that occurred during validation.
     *
     * @return {@link Exception}
     */
    public Exception getError() {
        return error;
    }
}