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package com.google.inject;

import com.google.common.collect.ImmutableSet;
import com.google.inject.internal.Messages;
import com.google.inject.spi.Message;

import java.util.Collection;

import static com.google.common.base.Preconditions.checkArgument;

/**
 * Indicates that there was a runtime failure while providing an instance.
 *
 */
public final class ProvisionException extends RuntimeException {

    private static final long serialVersionUID = 0;
    private final ImmutableSet messages;

    /**
     * Creates a ProvisionException containing {@code messages}.
     */
    public ProvisionException(Iterable messages) {
        this.messages = ImmutableSet.copyOf(messages);
        checkArgument(!this.messages.isEmpty());
        initCause(Messages.getOnlyCause(this.messages));
    }

    public ProvisionException(String message, Throwable cause) {
        super(cause);
        this.messages = ImmutableSet.of(new Message(message, cause));
    }

    public ProvisionException(String message) {
        this.messages = ImmutableSet.of(new Message(message));
    }

    /**
     * Returns messages for the errors that caused this exception.
     */
    public Collection getErrorMessages() {
        return messages;
    }

    @Override
    public String getMessage() {
        return Messages.formatMessages("Unable to provision, see the following errors", messages);
    }
}