src/main/java/de/uapcore/lightpit/modules/ProjectsModule.java

/*
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 *
 * Copyright 2018 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package de.uapcore.lightpit.modules;


import de.uapcore.lightpit.*;
import de.uapcore.lightpit.dao.DataAccessObjects;
import de.uapcore.lightpit.entities.*;
import de.uapcore.lightpit.viewmodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Date;
import java.sql.SQLException;
import java.util.NoSuchElementException;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import static de.uapcore.lightpit.Functions.fqn;

@WebServlet(
        name = "ProjectsModule",
        urlPatterns = "/projects/*"
)
public final class ProjectsModule extends AbstractLightPITServlet {

    private static final Logger LOG = LoggerFactory.getLogger(ProjectsModule.class);

    private static final String SESSION_ATTR_SELECTED_PROJECT = fqn(ProjectsModule.class, "selected_project");
    private static final String SESSION_ATTR_SELECTED_VERSION = fqn(ProjectsModule.class, "selected_version");
    private static final String PARAMETER_SELECTED_PROJECT = "pid";
    private static final String PARAMETER_SELECTED_VERSION = "vid";

    @Override
    protected String getResourceBundleName() {
        return "localization.projects";
    }

    private int syncParamWithSession(HttpServletRequest req, String param, String attr) {
        final var session = req.getSession();
        final var idParam = getParameter(req, Integer.class, param);
        final int id;
        if (idParam.isPresent()) {
            id = idParam.get();
            session.setAttribute(attr, id);
        } else {
            id = Optional.ofNullable(session.getAttribute(attr)).map(x->(Integer)x).orElse(-1);
        }
        return id;
    }

    private void populate(ProjectView viewModel, HttpServletRequest req, DataAccessObjects dao) throws SQLException {
        final var projectDao = dao.getProjectDao();
        final var versionDao = dao.getVersionDao();

        projectDao.list().stream().map(ProjectInfo::new).forEach(viewModel.getProjectList()::add);

        // Select Project
        final int pid = syncParamWithSession(req, PARAMETER_SELECTED_PROJECT, SESSION_ATTR_SELECTED_PROJECT);
        if (pid >= 0) {
            final var project = projectDao.find(pid);
            if (project == null) {
                req.setAttribute(SESSION_ATTR_SELECTED_PROJECT, -1);
            } else {
                final var info = new ProjectInfo(project);
                info.setVersions(versionDao.list(project));
                info.setIssueSummary(projectDao.getIssueSummary(project));
                viewModel.setProjectInfo(info);
            }
        }

        // Select Version
        final int vid = syncParamWithSession(req, PARAMETER_SELECTED_VERSION, SESSION_ATTR_SELECTED_VERSION);
        if (vid >= 0) {
            viewModel.setVersionFilter(versionDao.find(vid));
        }
    }

    private ResponseType forwardView(HttpServletRequest req, ProjectView viewModel, String name) {
        setViewModel(req, viewModel);
        setContentPage(req, name);
        setStylesheet(req, "projects");
        setNavigationMenu(req, "project-navmenu");
        return ResponseType.HTML;
    }

    @RequestMapping(method = HttpMethod.GET)
    public ResponseType index(HttpServletRequest req, DataAccessObjects dao) throws SQLException {
        final var viewModel = new ProjectView();
        populate(viewModel, req, dao);

        final var projectDao = dao.getProjectDao();
        final var versionDao = dao.getVersionDao();

        for (var info : viewModel.getProjectList()) {
            info.setVersions(versionDao.list(info.getProject()));
            info.setIssueSummary(projectDao.getIssueSummary(info.getProject()));
        }

        return forwardView(req, viewModel, "projects");
    }

    private void configure(ProjectEditView viewModel, Project project, DataAccessObjects dao) throws SQLException {
        viewModel.setProject(project);
        viewModel.setUsers(dao.getUserDao().list());
    }

    @RequestMapping(requestPath = "edit", method = HttpMethod.GET)
    public ResponseType edit(HttpServletRequest req, DataAccessObjects dao) throws SQLException {
        final var viewModel = new ProjectEditView();
        populate(viewModel, req, dao);

        final var project = Optional.ofNullable(viewModel.getProjectInfo())
                .map(ProjectInfo::getProject)
                .orElse(new Project(-1));
        configure(viewModel, project, dao);

        return forwardView(req, viewModel, "project-form");
    }

    @RequestMapping(requestPath = "commit", method = HttpMethod.POST)
    public ResponseType commit(HttpServletRequest req, DataAccessObjects dao) throws SQLException {

        Project project = new Project(-1);
        try {
            project = new Project(getParameter(req, Integer.class, "pid").orElseThrow());
            project.setName(getParameter(req, String.class, "name").orElseThrow());
            getParameter(req, String.class, "description").ifPresent(project::setDescription);
            getParameter(req, String.class, "repoUrl").ifPresent(project::setRepoUrl);
            getParameter(req, Integer.class, "owner").map(
                    ownerId -> ownerId >= 0 ? new User(ownerId) : null
            ).ifPresent(project::setOwner);

            dao.getProjectDao().saveOrUpdate(project);

            setRedirectLocation(req, "./projects/");
            setContentPage(req, Constants.JSP_COMMIT_SUCCESSFUL);
            LOG.debug("Successfully updated project {}", project.getName());

            return ResponseType.HTML;
        } catch (NoSuchElementException | IllegalArgumentException | SQLException ex) {
            LOG.warn("Form validation failure: {}", ex.getMessage());
            LOG.debug("Details:", ex);
            final var viewModel = new ProjectEditView();
            populate(viewModel, req, dao);
            configure(viewModel, project, dao);
            // TODO: error text
            return forwardView(req, viewModel, "project-form");
        }
    }

    @RequestMapping(requestPath = "view", method = HttpMethod.GET)
    public ResponseType view(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws SQLException, IOException {
        final var viewModel = new ProjectDetailsView();
        populate(viewModel, req, dao);

        if (viewModel.getProjectInfo() == null) {
            resp.sendError(HttpServletResponse.SC_NOT_FOUND, "No project selected.");
            return ResponseType.NONE;
        }

        final var issueDao = dao.getIssueDao();

        final var version = viewModel.getVersionFilter();

        final var detailView = viewModel.getProjectDetails();
        final var issues = issueDao.list(version);
        for (var issue : issues) issueDao.joinVersionInformation(issue);
        detailView.updateDetails(issues, version);

        return forwardView(req, viewModel, "project-details");
    }

    @RequestMapping(requestPath = "versions", method = HttpMethod.GET)
    public ResponseType versions(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException, SQLException {
        final var viewModel = new VersionsView();
        populate(viewModel, req, dao);
        viewModel.setVersionFilter(null);

        final var projectInfo = viewModel.getProjectInfo();
        if (projectInfo == null) {
            resp.sendError(HttpServletResponse.SC_NOT_FOUND, "No project selected.");
            return ResponseType.NONE;
        }

        final var issueDao = dao.getIssueDao();
        final var issues = issueDao.list(projectInfo.getProject());
        for (var issue : issues) issueDao.joinVersionInformation(issue);
        viewModel.update(projectInfo.getVersions(), issues);

        return forwardView(req, viewModel, "versions");
    }

    @RequestMapping(requestPath = "versions/edit", method = HttpMethod.GET)
    public ResponseType editVersion(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException, SQLException {
        final var viewModel = new VersionEditView();
        populate(viewModel, req, dao);

        if (viewModel.getProjectInfo() == null) {
            resp.sendError(HttpServletResponse.SC_NOT_FOUND, "No project selected.");
            return ResponseType.NONE;
        }

        if (viewModel.getVersionFilter() == null) {
            final var version = new Version(-1);
            version.setProject(viewModel.getProjectInfo().getProject());
            viewModel.setVersion(version);
        } else {
            viewModel.setVersion(viewModel.getVersionFilter());
        }

        return forwardView(req, viewModel, "version-form");
    }

    @RequestMapping(requestPath = "versions/commit", method = HttpMethod.POST)
    public ResponseType commitVersion(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws SQLException {

        var version = new Version(-1);
        try {
            version = new Version(getParameter(req, Integer.class, "id").orElseThrow());
            version.setProject(new Project(getParameter(req, Integer.class, "pid").orElseThrow()));
            version.setName(getParameter(req, String.class, "name").orElseThrow());
            getParameter(req, Integer.class, "ordinal").ifPresent(version::setOrdinal);
            version.setStatus(VersionStatus.valueOf(getParameter(req, String.class, "status").orElseThrow()));
            dao.getVersionDao().saveOrUpdate(version);

            // specifying the pid parameter will purposely reset the session selected version!
            setRedirectLocation(req, "./projects/versions?pid=" + version.getProject().getId());
            setContentPage(req, Constants.JSP_COMMIT_SUCCESSFUL);
        } catch (NoSuchElementException | IllegalArgumentException | SQLException ex) {
            LOG.warn("Form validation failure: {}", ex.getMessage());
            LOG.debug("Details:", ex);
            final var viewModel = new VersionEditView();
            populate(viewModel, req, dao);
            viewModel.setVersion(version);
            // TODO: set Error Text
            return forwardView(req, viewModel, "version-form");
        }

        return ResponseType.HTML;
    }

    private void configure(IssueEditView viewModel, Issue issue, DataAccessObjects dao) throws SQLException {
        issue.setProject(viewModel.getProjectInfo().getProject());
        viewModel.setIssue(issue);
        viewModel.configureVersionSelectors(viewModel.getProjectInfo().getVersions());
        viewModel.setUsers(dao.getUserDao().list());
    }

    @RequestMapping(requestPath = "issues/edit", method = HttpMethod.GET)
    public ResponseType editIssue(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws SQLException {
        final var viewModel = new IssueEditView();

        final var issueParam = getParameter(req, Integer.class, "issue");
        if (issueParam.isPresent()) {
            final var issueDao = dao.getIssueDao();
            final var issue = issueDao.find(issueParam.get());
            issueDao.joinVersionInformation(issue);
            req.getSession().setAttribute(SESSION_ATTR_SELECTED_PROJECT, issue.getProject().getId());
            populate(viewModel, req, dao);
            configure(viewModel, issue, dao);
        } else {
            populate(viewModel, req, dao);
            configure(viewModel, new Issue(-1), dao);
        }

        return forwardView(req, viewModel, "issue-form");
    }

    @RequestMapping(requestPath = "issues/commit", method = HttpMethod.POST)
    public ResponseType commitIssue(HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws SQLException {
        Issue issue = new Issue(-1);
        try {
            issue = new Issue(getParameter(req, Integer.class, "id").orElseThrow());
            issue.setProject(new Project(getParameter(req, Integer.class, "pid").orElseThrow()));
            getParameter(req, String.class, "category").map(IssueCategory::valueOf).ifPresent(issue::setCategory);
            getParameter(req, String.class, "status").map(IssueStatus::valueOf).ifPresent(issue::setStatus);
            issue.setSubject(getParameter(req, String.class, "subject").orElseThrow());
            getParameter(req, Integer.class, "assignee").map(
                    userid -> userid >= 0 ? new User(userid) : null
            ).ifPresent(issue::setAssignee);
            getParameter(req, String.class, "description").ifPresent(issue::setDescription);
            getParameter(req, Date.class, "eta").ifPresent(issue::setEta);

            getParameter(req, Integer[].class, "affected")
                    .map(Stream::of)
                    .map(stream ->
                            stream.map(Version::new).collect(Collectors.toList())
                    ).ifPresent(issue::setAffectedVersions);
            getParameter(req, Integer[].class, "resolved")
                    .map(Stream::of)
                    .map(stream ->
                            stream.map(Version::new).collect(Collectors.toList())
                    ).ifPresent(issue::setResolvedVersions);

            dao.getIssueDao().saveOrUpdate(issue);

            // specifying the issue parameter keeps the edited issue as menu item
            setRedirectLocation(req, "./projects/view?pid=" + issue.getProject().getId());
            setContentPage(req, Constants.JSP_COMMIT_SUCCESSFUL);
        } catch (NoSuchElementException | IllegalArgumentException | SQLException ex) {
            // TODO: set request attribute with error text
            LOG.warn("Form validation failure: {}", ex.getMessage());
            LOG.debug("Details:", ex);
            final var viewModel = new IssueEditView();
            configure(viewModel, issue, dao);
            // TODO: set Error Text
            return forwardView(req, viewModel, "issue-form");
        }

        return ResponseType.HTML;
    }
}