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Server-side integration for the FormKiQ ios application
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package com.formkiq.server.controller;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.Transactional;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.formkiq.server.service.FormService;

/**
 * Admin Controller.
 *
 */
@Controller
@RequestMapping(value = "/admin")
public class AdminController {

    /** FormService. */
    @Autowired
    private FormService formservice;

    /**
     * Admin Clients page.
     * @return {@link String}
     */
    @RequestMapping(value = "/clients", method = RequestMethod.GET)
    public String clients() {
        return "admin/clients";
    }

    /**
     * Admin Forms page.
     * @param type {@link String}
     * @param client {@link String}
     * @param name {@link String}
     * @param uuid {@link String}
     * @return {@link String}
     */
    @RequestMapping(value = "/forms", method = RequestMethod.GET)
    public String forms(
            @RequestParam(value = "type", required = false)
            final String type,
            @RequestParam(value = "client", required = false)
            final String client,
            @RequestParam(value = "name", required = false)
            final String name,
            @RequestParam(value = "uuid", required = false)
            final String uuid) {

        if (StringUtils.isEmpty(type)) {
            return "redirect:/admin/index";
        }

        if (!StringUtils.isEmpty(name) && !StringUtils.isEmpty(uuid)
                && !StringUtils.isEmpty(client)) {
            return "admin/formdetails";
        }

        return "admin/forms";
    }

    /**
     * Download Form.
     * @param request {@link HttpServletRequest}
     * @param response {@link HttpServletResponse}
     * @param client {@link String}
     * @param uuid {@link String}
     * @throws IOException IOException
     */
    @Transactional
    @RequestMapping("/download")
    public void download(
            final HttpServletRequest request,
            final HttpServletResponse response,
            @RequestParam(value = "client", required = true)
            final String client,
            @RequestParam(value = "uuid", required = true) final String uuid)
            throws IOException {

        // TODO zip workflow with all forms
        byte[] data = this.formservice.findFormData(client, uuid);

        response.setContentType("application/zip");
        response.setHeader("Content-disposition",
                "attachment; filename=" + uuid + ".zip");
        response.setContentLengthLong(data.length);
        IOUtils.write(data, response.getOutputStream());
    }

    /**
     * Admin Index.
     * @return {@link String}
     */
    @RequestMapping(value = "/index", method = RequestMethod.GET)
    public String index() {
        return "redirect:/admin/users";
    }

    /**
     * Admin Users page.
     * @return {@link String}
     */
    @RequestMapping(value = "/users", method = RequestMethod.GET)
    public String users() {
        return "admin/users";
    }

    /**
     * Admin Workflows page.
     * @return {@link String}
     */
    @RequestMapping(value = "/workflows", method = RequestMethod.GET)
    public String workflows() {
        return "admin/workflows";
    }
}