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 * as smartQuery from "./smart-query";
import { map, parse, stringify } from "../lib/common/expression-parser";
import { loadYaml, yaml } from "./dynamic-loader";

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

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

const attributes = [
  { id: "device", label: "Device" },
  { id: "channel", label: "Channel" },
  { id: "code", label: "Code" },
  { id: "message", label: "Message" },
  { id: "detail", label: "Detail", unsortable: true },
  { id: "retries", label: "Retries" },
  { id: "timestamp", label: "Timestamp" }
];

const getDownloadUrl = memoize(filter => {
  const cols = {};
  for (const attr of attributes) {
    cols[attr.label] =
      attr.id === "timestamp" ? `DATE_STRING(${attr.id})` : attr.id;
  }

  return `/api/faults.csv?${m.buildQueryString({
    filter: stringify(filter),
    columns: JSON.stringify(cols)
  })}`;
});

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

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

  const sort = args.sort;
  const filter = args.filter;
  return new Promise((resolve, reject) => {
    loadYaml()
      .then(() => {
        resolve({ filter, sort });
      })
      .catch(reject);
  });
}

function renderTable(
  faultsResponse,
  total,
  selected,
  showMoreCallback,
  downloadUrl,
  sort,
  onSortChange
): Children {
  const faults = faultsResponse.value;
  const selectAll = m("input", {
    type: "checkbox",
    checked: faults.length && selected.size === faults.length,
    onchange: e => {
      for (const f of faults) {
        if (e.target.checked) selected.add(f["_id"]);
        else selected.delete(f["_id"]);
      }
    },
    disabled: !total
  });

  const labels = [m("th", selectAll)];
  for (const attr of attributes) {
    const label = attr.label;

    if (attr.unsortable) {
      labels.push(m("th", label));
      continue;
    }

    // Offset direction by 1 since sort["_id"] = -1
    let direction = 2;

    let symbol = "\u2981";
    if (sort[attr.id] > 0) symbol = "\u2bc6";
    else if (sort[attr.id] < 0) symbol = "\u2bc5";

    const sortable = m(
      "button",
      {
        onclick: () => {
          if (sort[attr.id] > 0) direction *= -1;
          return onSortChange(JSON.stringify({ [attr.id]: direction }));
        }
      },
      symbol
    );

    labels.push(m("th", [label, sortable]));
  }

  const rows = [];
  for (const f of faults) {
    const checkbox = m("input", {
      type: "checkbox",
      checked: selected.has(f["_id"]),
      onchange: e => {
        if (e.target.checked) selected.add(f["_id"]);
        else selected.delete(f["_id"]);
      },
      onclick: e => {
        e.stopPropagation();
        e.redraw = false;
      }
    });

    const deviceHref = `#!/devices/${encodeURIComponent(f["device"])}`;

    const tds = [m("td", checkbox)];
    for (const attr of attributes) {
      if (attr.id === "device")
        tds.push(m("td", m("a", { href: deviceHref }, f[attr.id])));
      else if (attr.id === "timestamp")
        tds.push(m("td", new Date(f[attr.id]).toLocaleString()));
      else if (attr.id === "detail")
        tds.push(m("td", m("long-text", { text: yaml.stringify(f[attr.id]) })));
      else tds.push(m("td", f[attr.id]));
    }

    rows.push(
      m(
        "tr",
        {
          onclick: e => {
            if (["INPUT", "BUTTON", "A"].includes(e.target.nodeName)) {
              e.redraw = false;
              return;
            }

            if (!selected.delete(f["_id"])) selected.add(f["_id"]);
          }
        },
        tds
      )
    );
  }

  if (!rows.length)
    rows.push(m("tr.empty", m("td", { colspan: 7 }, "No faults")));

  const footerElements = [];
  if (total != null) footerElements.push(`${faults.length}/${total}`);
  else footerElements.push(`${faults.length}`);

  footerElements.push(
    m(
      "button",
      {
        title: "Show more faults",
        onclick: showMoreCallback,
        disabled: faults.length >= total || !faultsResponse.fulfilled
      },
      "More"
    )
  );

  if (downloadUrl) {
    footerElements.push(
      m("a.download-csv", { href: downloadUrl, download: "" }, "Download")
    );
  }

  const tfoot = m(
    "tfoot",
    m("tr", m("td", { colspan: labels.length }, footerElements))
  );

  const buttons = [
    m(
      "button.primary",
      {
        title: "Delete selected faults",
        disabled: !selected.size,
        onclick: e => {
          e.redraw = false;
          e.target.disabled = true;
          Promise.all(
            Array.from(selected).map(id => store.deleteResource("faults", id))
          )
            .then(res => {
              notifications.push("success", `${res.length} faults deleted`);
              store.fulfill(0, Date.now());
            })
            .catch(err => {
              notifications.push("error", err.message);
              store.fulfill(0, Date.now());
            });
        }
      },
      "Delete"
    )
  ];

  return [
    m(
      "table.table.highlight",
      m("thead", m("tr", labels)),
      m("tbody", rows),
      tfoot
    ),
    buttons
  ];
}

export const component: ClosureComponent = (): Component => {
  return {
    view: vnode => {
      document.title = "Faults - 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("/faults", ops);
      }

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

      const sort = vnode.attrs["sort"]
        ? memoizedJsonParse(vnode.attrs["sort"])
        : {};
      let filter = vnode.attrs["filter"]
        ? memoizedParse(vnode.attrs["filter"])
        : true;
      filter = unpackSmartQuery(filter);

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

      const selected = new Set();
      if (vnode.state["selected"]) {
        for (const f of faults.value)
          if (vnode.state["selected"].has(f["_id"])) selected.add(f["_id"]);
      }
      vnode.state["selected"] = selected;

      const downloadUrl = getDownloadUrl(filter);

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

      return [
        m("h1", "Listing faults"),
        m(filterComponent, attrs),
        renderTable(
          faults,
          count.value,
          selected,
          showMore,
          downloadUrl,
          sort,
          onSortChange
        )
      ];
    }
  };
};