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package org.apache.james.webadmin.service;

import javax.inject.Inject;

import org.apache.james.mailbox.indexer.IndexingDetailInformation;
import org.apache.james.task.TaskExecutionDetails;
import org.apache.james.task.TaskId;
import org.apache.james.task.TaskManager;
import org.apache.james.task.TaskNotFoundException;
import org.apache.james.task.TaskType;

public class PreviousReIndexingService {
    public static class TaskNotYetFinishedException extends RuntimeException {
        TaskNotYetFinishedException(TaskManager.Status currentStatus) {
            super("Task is not yet finished. Current status is: " + currentStatus);
        }
    }

    public static class NotAnIndexingRetriableTask extends RuntimeException {
        NotAnIndexingRetriableTask(TaskType type) {
            super("'" + type.asString() + "' is not a valid type of task for retrying a failed indexing");
        }
    }

    private final TaskManager taskManager;

    @Inject
    public PreviousReIndexingService(TaskManager taskManager) {
        this.taskManager = taskManager;
    }

    public IndexingDetailInformation retrieveIndexingExecutionDetails(TaskId taskId) throws NotAnIndexingRetriableTask, TaskNotFoundException, TaskNotYetFinishedException {
        TaskExecutionDetails executionDetails = taskManager.getExecutionDetails(taskId);
        if (!executionDetails.getStatus().isFinished()) {
            throw new TaskNotYetFinishedException(executionDetails.getStatus());
        }
        return executionDetails.getAdditionalInformation()
            .filter(additionalInformation -> additionalInformation instanceof IndexingDetailInformation)
            .map(additionalInformation -> (IndexingDetailInformation) additionalInformation)
            .orElseThrow(() -> new NotAnIndexingRetriableTask(executionDetails.getType()));
    }
}