import { ClosureComponent, Component, Children } from "mithril";
import { m } from "./components.ts";
import * as store from "./store.ts";
import * as notifications from "./notifications.ts";
import putFormComponent from "./put-form-component.ts";
import uiConfigComponent from "./ui-config-component.ts";
import * as overlay from "./overlay.ts";
import Expression from "../lib/common/expression.ts";
import { loadCodeMirror, loadYaml } from "./dynamic-loader.ts";
import { icon } from "./tailwind-utility-components.ts";

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

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

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

          store
            .putResource("config", id, object)
            .then(() => {
              notifications.push(
                "success",
                `Config ${exists ? "updated" : "created"}`,
              );
              store.setTimestamp(Date.now());
              resolve(null);
            })
            .catch(reject);
        })
        .catch(reject);
    } else if (action === "delete") {
      if (!confirm("Deleting config. Are you sure?")) return void resolve(null);
      store
        .deleteResource("config", object["_id"])
        .then(() => {
          notifications.push("success", "Config deleted");
          store.setTimestamp(Date.now());
          resolve(null);
        })
        .catch((err) => {
          store.setTimestamp(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<void>((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?"),
          );
        },
      },
      m(icon, {
        name: "edit",
        class: "inline h-4 w-4 ml-1 text-cyan-700 hover:text-cyan-900",
      }),
    );

    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;
          });
        },
      },
      m(icon, {
        name: "remove",
        class: "inline h-4 w-4 ml-1 text-cyan-700 hover:text-cyan-900",
      }),
    );

    rows.push(
      m(
        "tr",
        attrs,
        m("td.pl-4 pr-2 py-2 truncate", m("long-text", { text: conf._id })),
        m(
          "td.px-2 py-2 text-right truncate",
          m("long-text", { text: `${conf.value}` }),
        ),
        m("td.pl-2 pr-4 py-2 w-max", edit, del),
      ),
    );
  }

  if (!rows.length) rows.push(m("tr", m("td", { colspan: 3 }, "No config")));

  return m(
    "table.w-full table-fixed font-mono text-sm text-stone-700",
    m("tbody.bg-white divide-y divide-stone-200", rows),
  );
}

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

      const search = m(
        "input.appearance-none block w-full px-3 py-2 border-stone-300 placeholder-stone-500 text-stone-900 focus:ring-cyan-500 focus:border-cyan-500 sm:text-sm rounded-md mt-1 max-w-screen-sm shadow-sm mb-5",
        {
          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", new Expression.Literal(true));

      let newConfig;
      const subs = [];

      if (window.authorizer.hasAccess("config", 3)) {
        newConfig = m(
          "button.mr-4 px-4 py-2 border border-stone-300 shadow-xs text-sm font-medium rounded-md text-stone-700 bg-white hover:bg-stone-50 focus:outline-hidden focus:ring-2 focus:ring-offset-2 focus:ring-cyan-500",
          {
            title: "Create new config",
            onclick: () => {
              let cb: () => Children = null;
              const comp = m(
                putFormComponent,
                Object.assign(
                  {
                    actionHandler: (action, object) => {
                      return new Promise<void>((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(null);
                          })
                          .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.mr-4 px-4 py-2 border border-stone-300 shadow-xs text-sm font-medium rounded-md text-stone-700 bg-white hover:bg-stone-50 focus:outline-hidden focus:ring-2 focus:ring-offset-2 focus:ring-cyan-500",
              {
                onclick: () => {
                  let cb: () => Children = null;
                  const comp = m(
                    uiConfigComponent,
                    Object.assign(
                      {
                        onUpdate: (errs: Record<string, 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.setTimestamp(Date.now());
                        },
                        onError: (err) => {
                          notifications.push("error", err.message);
                          store.setTimestamp(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.text-xl font-medium text-stone-900 mb-5", "Listing config"),
        m(
          "loading",
          { queries: [confs] },
          m(
            "div",
            search,
            m(
              ".shadow-sm overflow-hidden border-b border-stone-200 rounded-lg bg-white",
              m(
                ".overflow-y-scroll h-96",
                renderTable(confs, vnode.state["searchString"]),
              ),
            ),
            m(".mt-5", [newConfig].concat(subs)),
          ),
        ),
      ];
    },
  };
};