package com.smartcodeltd.jenkinsci.plugins.buildmonitor.viewmodel.syntacticsugar;

import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import hudson.model.ItemGroup;
import hudson.model.AbstractBuild;
import hudson.model.Job;

import java.util.Stack;

/**
 * @author Jan Molak
 */
public class JobStateRecipe {
  private Job job;
  private Stack<AbstractBuild> buildHistory = new Stack<AbstractBuild>();

  public JobStateRecipe() {
    job = mock(Job.class);
  }

  public JobStateRecipe withName(String name) {
    when(job.getName()).thenReturn(name);

    // The name of the job also defines its URL, that's why the stub for getUrl() is defined here as
    // well.
    // You could argue, that 'withUrl' could be a separate method on the builder,
    // but then this would allow for creation of impossible scenarios, such as:
    // job.withName("a-name").withUrl("something completely different"), which leads nowhere.
    return withShortUrl(name);
  }

  private JobStateRecipe withShortUrl(String url) {
    when(job.getShortUrl()).thenReturn(url);

    // This might not necessarily belong here,
    // but I don't need to introduce the concept of a parent anywhere else yet.
    ItemGroup parent = mock(ItemGroup.class);
    when(parent.getUrl()).thenReturn("job/");
    when(job.getParent()).thenReturn(parent);

    return this;
  }

  public JobStateRecipe withDisplayName(String name) {
    when(job.getDisplayNameOrNull()).thenReturn(name);
    when(job.getDisplayName()).thenReturn(name);

    return this;
  }

  public JobStateRecipe thatHasNeverRun() {
    buildHistory.clear();

    return this;
  }

  public JobStateRecipe whereTheLast(BuildStateRecipe recipe) {
    return updatedWithOnlyOneHistoryEntryFor(recipe.execute());
  }

  public JobStateRecipe andThePrevious(BuildStateRecipe recipe) {
    return updatedWithEarliestHistoryEntryFor(recipe.execute());
  }

  @SuppressWarnings("unchecked")
  public Job<?, ?> execute() {
    AbstractBuild earlierBuild, earliestBuild;

    // link "previous" builds ...
    while (buildHistory.size() > 1) {
      earliestBuild = buildHistory.pop();
      earlierBuild = buildHistory.peek();

      when(earlierBuild.getPreviousBuild()).thenReturn(earliestBuild);
    }

    // pick the first build from the build history and make it the "last build"
    if (buildHistory.size() == 1) {
      when(job.getLastBuild()).thenReturn(buildHistory.pop());
    }

    return job;
  }

  private JobStateRecipe updatedWithEarliestHistoryEntryFor(AbstractBuild build) {
    buildHistory.push(build);

    return this;
  }

  private JobStateRecipe updatedWithOnlyOneHistoryEntryFor(AbstractBuild build) {
    buildHistory.clear();

    return updatedWithEarliestHistoryEntryFor(build);
  }
}