/**
 * 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 { m } from "./components";
import * as store from "./store";
import * as notifications from "./notifications";
import putFormComponent from "./put-form-component";
import uiConfigComponent from "./ui-config-component";
import * as overlay from "./overlay";
import { parse, stringify } from "../lib/common/expression-parser";
import { loadCodeMirror, loadYaml } from "./dynamic-loader";
import { ClosureComponent, Component, Children } from "mithril";
import { getIcon } from "./icons";

const attributes = [
  { id: "_id", label: "Key" },
  { id: "value", label: "Value", type: "textarea" },
];

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

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

      const regex = /^[0-9a-zA-Z_.-]+$/;
      id = id.trim();
      if (!id.match(regex)) return void resolve({ _id: "Invalid ID" });

      try {
        object.value = stringify(parse(object.value || ""));
      } catch (err) {
        return void resolve({
          value: "Config value must be valid expression",
        });
      }

      store
        .resourceExists("config", id)
        .then((exists) => {
          if (exists && isNew) {
            store.fulfill(0, Date.now());
            return void resolve({ _id: "Config already exists" });
          }

          if (!exists && !isNew) {
            store.fulfill(0, Date.now());
            return void resolve({ _id: "Config does not exist" });
          }

          store
            .putResource("config", id, object)
            .then(() => {
              notifications.push(
                "success",
                `Config ${exists ? "updated" : "created"}`
              );
              store.fulfill(0, Date.now());
              resolve();
            })
            .catch(reject);
        })
        .catch(reject);
    } else if (action === "delete") {
      store
        .deleteResource("config", object["_id"])
        .then(() => {
          notifications.push("success", "Config deleted");
          store.fulfill(0, Date.now());
          resolve();
        })
        .catch((err) => {
          store.fulfill(0, Date.now());
          reject(err);
        });
    } else {
      reject(new Error("Undefined action"));
    }
  });
}

const formData = {
  resource: "config",
  attributes: attributes,
};

function escapeRegExp(str): string {
  return str.replace(/[-[\]/{}()*+?.\\^$|]/g, "\\$&");
}

export function init(): Promise<Record<string, unknown>> {
  if (!window.authorizer.hasAccess("config", 2)) {
    return Promise.reject(
      new Error("You are not authorized to view this page")
    );
  }
  return new Promise((resolve, reject) => {
    Promise.all([loadCodeMirror(), loadYaml()])
      .then(() => {
        resolve({});
      })
      .catch(reject);
  });
}

function renderTable(confsResponse, searchString): Children {
  const confs = confsResponse.value.sort((a, b) => {
    return a._id < b._id ? -1 : 1;
  });

  let regex;
  if (searchString) {
    const keywords = searchString.split(" ").filter((s) => s);
    if (keywords.length)
      regex = new RegExp(keywords.map((s) => escapeRegExp(s)).join(".*"), "i");
  }

  const rows = [];
  for (const conf of confs) {
    const attrs = {};
    if (regex && !regex.test(conf._id) && !regex.test(conf.value))
      attrs["style"] = "display: none;";

    const edit = m(
      "button",
      {
        title: "Edit config value",
        onclick: () => {
          let cb: () => Children = null;
          const comp = m(
            putFormComponent,
            Object.assign(
              {
                base: conf,
                actionHandler: (action, object) => {
                  return new Promise((resolve) => {
                    putActionHandler(action, object, false)
                      .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?")
          );
        },
      },
      getIcon("edit")
    );

    const del = m(
      "button",
      {
        title: "Delete config",
        onclick: () => {
          if (!confirm(`Deleting ${conf._id} config. Are you sure?`)) return;

          putActionHandler("delete", conf).catch((err) => {
            throw err;
          });
        },
      },
      getIcon("remove")
    );

    rows.push(
      m(
        "tr",
        attrs,
        m("td.left", m("long-text", { text: conf._id })),
        m(
          "td.right",
          m("span", [m("long-text", { text: `${conf.value}` }), edit, del])
        )
      )
    );
  }

  if (!rows.length)
    rows.push(m("tr.empty", m("td", { colspan: 2 }, "No config")));

  return m("table", m("tbody", rows));
}

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

      const search = m("input", {
        type: "text",
        placeholder: "Search config",
        oninput: (e) => {
          vnode.state["searchString"] = e.target.value;
          e.redraw = false;
          clearTimeout(vnode.state["timeout"]);
          vnode.state["timeout"] = setTimeout(m.redraw, 250);
        },
      });

      const confs = store.fetch("config", true);

      let newConfig;
      const subs = [];

      if (window.authorizer.hasAccess("config", 3)) {
        newConfig = m(
          "button.primary",
          {
            title: "Create new config",
            onclick: () => {
              let cb: () => Children = null;
              const comp = m(
                putFormComponent,
                Object.assign(
                  {
                    actionHandler: (action, object) => {
                      return new Promise((resolve) => {
                        putActionHandler(action, object, true)
                          .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 config"
        );

        const subsData = [
          { name: "overview", prefix: "ui.overview.groups.", data: [] },
          { name: "charts", prefix: "ui.overview.charts.", data: [] },
          { name: "filters", prefix: "ui.filters.", data: [] },
          { name: "index page", prefix: "ui.index.", data: [] },
          { name: "device page", prefix: "ui.device.", data: [] },
        ];

        if (confs.fulfilled) {
          for (const conf of confs.value) {
            for (const sub of subsData) {
              if (conf["_id"].startsWith(sub["prefix"])) {
                sub["data"].push(conf);
                break;
              }
            }
          }
        }

        for (const sub of subsData) {
          const attrs = { prefix: sub.prefix, name: sub.name, data: sub.data };
          subs.push(
            m(
              "button",
              {
                onclick: () => {
                  let cb: () => Children = null;
                  const comp = m(
                    uiConfigComponent,
                    Object.assign(
                      {
                        onUpdate: (errs: string[]) => {
                          const errors = errs ? Object.values(errs) : [];
                          if (errors.length) {
                            for (const err of errors)
                              notifications.push("error", err);
                          } else {
                            notifications.push(
                              "success",
                              `${sub.name.replace(
                                /^[a-z]/,
                                sub.name[0].toUpperCase()
                              )} config updated`
                            );
                            overlay.close(cb);
                          }
                          store.fulfill(0, Date.now());
                        },
                        onError: (err) => {
                          notifications.push("error", err.message);
                          store.fulfill(0, Date.now());
                          overlay.close(cb);
                        },
                      },
                      attrs
                    )
                  );
                  cb = () => comp;
                  overlay.open(
                    cb,
                    () =>
                      !comp.state["modified"] ||
                      confirm("You have unsaved changes. Close anyway?")
                  );
                },
              },
              `Edit ${sub.name}`
            )
          );
        }
      }

      return [
        m("h1", "Listing config"),
        m(
          ".all-parameters",
          search,
          m(
            ".parameter-list",
            { style: "height: 400px" },
            renderTable(confs, vnode.state["searchString"])
          ),
          m(".actions-bar", [newConfig].concat(subs))
        ),
      ];
    },
  };
};