/**
 * Copyright 2013-2019  GenieACS Inc.
 *
 * This file is part of GenieACS.
 *
 * GenieACS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * GenieACS is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with GenieACS.  If not, see <http://www.gnu.org/licenses/>.
 */

import { ClosureComponent, Component, Children } from "mithril";
import { m } from "./components";
import config from "./config";
import filterComponent from "./filter-component";
import * as store from "./store";
import * as notifications from "./notifications";
import memoize from "../lib/common/memoize";
import putFormComponent from "./put-form-component";
import indexTableComponent from "./index-table-component";
import * as overlay from "./overlay";
import * as smartQuery from "./smart-query";
import { map, parse, stringify } from "../lib/common/expression-parser";

const PAGE_SIZE = config.ui.pageSize || 10;

const memoizedParse = memoize(parse);
const memoizedJsonParse = memoize(JSON.parse);

const attributes: {
  id: string;
  label: string;
  type?: string;
  options?: any;
}[] = [
  { id: "_id", label: "Name" },
  {
    id: "metadata.fileType",
    label: "Type",
    type: "combo",
    options: [
      "1 Firmware Upgrade Image",
      "2 Web Content",
      "3 Vendor Configuration File",
      "4 Tone File",
      "5 Ringer File",
    ],
  },
  { id: "metadata.oui", label: "OUI" },
  { id: "metadata.productClass", label: "Product Class" },
  { id: "metadata.version", label: "Version" },
];

const formData = {
  resource: "files",
  attributes: attributes
    .slice(1) // remove _id from new object form
    .concat([{ id: "file", label: "File", type: "file" }]),
};

const unpackSmartQuery = memoize((query) => {
  return map(query, (e) => {
    if (Array.isArray(e) && e[0] === "FUNC" && e[1] === "Q")
      return smartQuery.unpack("files", e[2], e[3]);
    return e;
  });
});

interface ValidationErrors {
  [prop: string]: string;
}

function putActionHandler(action, _object): Promise<ValidationErrors> {
  return new Promise((resolve, reject) => {
    const object = Object.assign({}, _object);
    if (action === "save") {
      const file = object["file"] ? object["file"][0] : null;
      delete object["file"];

      if (!file) return void resolve({ file: "File not selected" });

      const id = file.name;

      store
        .resourceExists("files", id)
        .then((exists) => {
          if (exists) {
            store.fulfill(0, Date.now());
            return void resolve({ file: "File already exists" });
          }
          const headers = Object.assign(
            {
              "Content-Type": "application/octet-stream",
              Accept: "application/octet-stream",
            },
            object
          );

          store
            .xhrRequest({
              method: "PUT",
              headers: headers,
              url: `api/files/${encodeURIComponent(id)}`,
              serialize: (body) => body, // Identity function to prevent JSON.parse on blob data
              body: file,
            })
            .then(() => {
              notifications.push(
                "success",
                `File ${exists ? "updated" : "created"}`
              );
              store.fulfill(0, Date.now());
              resolve();
            })
            .catch(reject);
        })
        .catch(reject);
    } else {
      reject(new Error("Undefined action"));
    }
  });
}

const getDownloadUrl = memoize((filter) => {
  const cols = {};
  for (const attr of attributes) cols[attr.label] = attr.id;
  return `api/files.csv?${m.buildQueryString({
    filter: stringify(filter),
    columns: JSON.stringify(cols),
  })}`;
});

export function init(
  args: Record<string, unknown>
): Promise<Record<string, unknown>> {
  if (!window.authorizer.hasAccess("files", 2)) {
    return Promise.reject(
      new Error("You are not authorized to view this page")
    );
  }

  const sort = args.hasOwnProperty("sort") ? "" + args["sort"] : "";
  const filter = args.hasOwnProperty("filter") ? "" + args["filter"] : "";
  return Promise.resolve({ filter, sort });
}

export const component: ClosureComponent = (): Component => {
  return {
    view: (vnode) => {
      document.title = "Files - GenieACS";

      function showMore(): void {
        vnode.state["showCount"] =
          (vnode.state["showCount"] || PAGE_SIZE) + PAGE_SIZE;
        m.redraw();
      }

      function onFilterChanged(filter): void {
        const ops = { filter };
        if (vnode.attrs["sort"]) ops["sort"] = vnode.attrs["sort"];
        m.route.set("/admin/files", ops);
      }

      const sort = vnode.attrs["sort"]
        ? memoizedJsonParse(vnode.attrs["sort"])
        : {};

      const sortAttributes = {};
      for (let i = 0; i < attributes.length; i++)
        sortAttributes[i] = sort[attributes[i].id] || 0;

      function onSortChange(sortAttrs): void {
        const _sort = Object.assign({}, sort);
        for (const [index, direction] of Object.entries(sortAttrs)) {
          // Changing the priority of columns
          delete _sort[attributes[index].id];
          _sort[attributes[index].id] = direction;
        }

        const ops = { sort: JSON.stringify(_sort) };
        if (vnode.attrs["filter"]) ops["filter"] = vnode.attrs["filter"];
        m.route.set("/admin/files", ops);
      }

      let filter = vnode.attrs["filter"]
        ? memoizedParse(vnode.attrs["filter"])
        : true;
      filter = unpackSmartQuery(filter);

      const files = store.fetch("files", filter, {
        limit: vnode.state["showCount"] || PAGE_SIZE,
        sort: sort,
      });

      const count = store.count("files", filter);

      const downloadUrl = getDownloadUrl(filter);

      const attrs = {};
      attrs["attributes"] = attributes;
      attrs["data"] = files.value;
      attrs["total"] = count.value;
      attrs["showMoreCallback"] = showMore;
      attrs["sortAttributes"] = sortAttributes;
      attrs["onSortChange"] = onSortChange;
      attrs["downloadUrl"] = downloadUrl;

      if (window.authorizer.hasAccess("files", 3)) {
        attrs["actionsCallback"] = (selected: Set<string>): Children => {
          return [
            m(
              "button.primary",
              {
                title: "Create new file",
                onclick: () => {
                  let cb: () => Children = null;
                  const comp = m(
                    putFormComponent,
                    Object.assign(
                      {
                        actionHandler: (action, object) => {
                          return new Promise((resolve) => {
                            putActionHandler(action, object)
                              .then((errors) => {
                                const errorList = errors
                                  ? Object.values(errors)
                                  : [];
                                if (errorList.length) {
                                  for (const err of errorList)
                                    notifications.push("error", err);
                                } else {
                                  overlay.close(cb);
                                }
                                resolve();
                              })
                              .catch((err) => {
                                notifications.push("error", err.message);
                                resolve();
                              });
                          });
                        },
                      },
                      formData
                    )
                  );
                  cb = () => comp;
                  overlay.open(
                    cb,
                    () =>
                      !comp.state["current"]["modified"] ||
                      confirm("You have unsaved changes. Close anyway?")
                  );
                },
              },
              "New"
            ),
            m(
              "button.primary",
              {
                title: "Delete selected files",
                disabled: !selected.size,
                onclick: (e) => {
                  if (
                    !confirm(`Deleting ${selected.size} files. Are you sure?`)
                  )
                    return;

                  e.redraw = false;
                  e.target.disabled = true;
                  Promise.all(
                    Array.from(selected).map((id) =>
                      store.deleteResource("files", id)
                    )
                  )
                    .then((res) => {
                      notifications.push(
                        "success",
                        `${res.length} files deleted`
                      );
                      store.fulfill(0, Date.now());
                    })
                    .catch((err) => {
                      notifications.push("error", err.message);
                      store.fulfill(0, Date.now());
                    });
                },
              },
              "Delete"
            ),
          ];
        };
      }

      const filterAttrs = {};
      filterAttrs["resource"] = "files";
      filterAttrs["filter"] = vnode.attrs["filter"];
      filterAttrs["onChange"] = onFilterChanged;

      return [
        m("h1", "Listing files"),
        m(filterComponent, filterAttrs),
        m(indexTableComponent, attrs),
      ];
    },
  };
};