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
          );

          m.request({
            method: "PUT",
            headers: headers,
            url: `/api/files/${encodeURIComponent(id)}`,
            serialize: body => body, // Identity function to prevent JSON.parse on blob data
            data: 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): Promise<{}> {
  if (!window.authorizer.hasAccess("files", 2)) {
    return Promise.reject(
      new Error("You are not authorized to view this page")
    );
  }

  const sort = args.sort;
  const 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(m.route.get(), 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(m.route.get(), 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): Children => {
          return [
            m(
              "button.primary",
              {
                title: "Create new file",
                onclick: () => {
                  const cb = (): Children => {
                    return 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
                      )
                    );
                  };
                  overlay.open(cb);
                }
              },
              "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)
      ];
    }
  };
};