/**
 * Client side of the first-party UI extension points: how each validated
 * declaration is projected onto the workbench, and how its items appear on
 * the plugin details page. One `defineUiPoint` per contribution type.
 */
import { registerEndpointProvider, type EndpointEntry } from "@/workbench/contributions";
import type { PluginInfo, ThemeDef } from "@/bindings";
import { registerAction } from "@/platform/actions";
import { tx } from "@/platform/i18n";
import { addContributedTheme, pluginThemeRef } from "@/platform/themes";
import { currentThemeChoice, setTheme, useThemeOverride } from "@/workbench/theme";
import { useProject } from "@/platform/project";
import { Button, Kbd, T } from "@/ui";
import { addIconTheme, iconThemeKey, selectIconTheme, useSelectedIconTheme } from "./iconThemes";
import { defineUiPoint, type UiItem } from "./projection";
import { SecretsDetails, type SecretDecl } from "./secrets";
import { defineViewUiPoints, pluginSettingsPageId } from "./uiPoints";
import { pluginsBackend } from "./backend";
import { isLive, runPluginCommand } from "./store";
import styles from "./PluginsPage.module.css";

/** Unpacks an action argument: a bare path, or a menu's `{ path, paths }`. */
export function commandArgs(arg: unknown): [string | null, string[]] {
  if (typeof arg === "string") return [arg, []];
  const { path, paths } = (arg ?? {}) as { path?: unknown; paths?: unknown };
  if (typeof path !== "string" || !Array.isArray(paths)) return [null, []];
  return [path, paths.filter((p): p is string => typeof p === "string")];
}

export const pluginActionId = (pluginId: string, commandId: string) => `plugin.${pluginId}.${commandId}`;

interface CommandDecl {
  id: string;
  title: string;
  category?: string | null;
  when?: string | null;
}

function CommandsDetails({ plugin, items }: { plugin: PluginInfo; items: UiItem<CommandDecl>[] }) {
  const runnable = plugin.status === "active" || plugin.status === "inactive";
  return (
    <ul className={styles.items}>
      {items.map(({ decl: c }) => {
        const actionId = pluginActionId(plugin.id, c.id);
        return (
          <li key={c.id} className={styles.item}>
            <span className={styles.itemMain}>{c.title}</span>
            <Kbd action={actionId} />
            <span className={styles.mono} title={tx("Action id (bind it in Keymap)")}>
              {actionId}
            </span>
            <Button
              size="small"
              variant="ghost"
              icon="run"
              disabled={!runnable}
              onClick={() => void runPluginCommand(plugin.id, c.id)}
              aria-label={tx`Run ${c.title}`}
            >
              <T>Run</T>
            </Button>
          </li>
        );
      })}
    </ul>
  );
}

function ThemesDetails({ plugin, items }: { plugin: PluginInfo; items: UiItem<ThemeDef>[] }) {
  // The selection is the Appearance setting; these buttons write it as the theme pickers do.
  useProject((s) => s.settings?.appearance);
  useThemeOverride((s) => s.theme);
  const selected = currentThemeChoice();
  const live = isLive(plugin.status);
  return (
    <ul className={styles.items}>
      {items.map(({ decl: t }) => {
        const isActive = selected === pluginThemeRef(plugin.id, t.id);
        return (
          <li key={t.id} className={styles.item}>
            <span className={styles.itemMain}>{t.name}</span>
            <span className={styles.muted}>{t.kind === "dark" ? tx("Dark") : tx("Light")}</span>
            {isActive ? (
              <Button
                size="small"
                variant="secondary"
                onClick={() => void setTheme(t.kind === "light" ? "light" : "dark")}
              >
                <T>Use Default Theme</T>
              </Button>
            ) : (
              <Button
                size="small"
                variant="ghost"
                disabled={!live}
                onClick={() => void setTheme(pluginThemeRef(plugin.id, t.id))}
                aria-label={tx`Apply theme ${t.name}`}
              >
                <T>Apply</T>
              </Button>
            )}
          </li>
        );
      })}
    </ul>
  );
}

interface IconThemeDecl {
  id: string;
  label: string;
  icons: number;
}

function IconThemesDetails({ plugin, items }: { plugin: PluginInfo; items: UiItem<IconThemeDecl>[] }) {
  const selected = useSelectedIconTheme();
  return (
    <ul className={styles.items}>
      {items.map(({ decl: t }) => {
        const key = iconThemeKey(plugin.id, t.id);
        return (
          <li key={t.id} className={styles.item}>
            <span className={styles.itemMain}>{t.label}</span>
            <span className={styles.muted}>{tx`${t.icons} icons`}</span>
            {selected === key ? (
              <Button size="small" variant="secondary" onClick={() => void selectIconTheme(null)}>
                <T>Use Default Icons</T>
              </Button>
            ) : (
              <Button
                size="small"
                variant="ghost"
                onClick={() => void selectIconTheme(key)}
                aria-label={tx`Apply icon theme ${t.label}`}
              >
                <T>Apply</T>
              </Button>
            )}
          </li>
        );
      })}
    </ul>
  );
}

const endpointPlugins = new Map<string, { declarations: number; dispose: () => void }>();

/** One endpoint provider per plugin, however many `[[contributes.endpoints]]` it declares. */
function providePluginEndpoints(pluginId: string): () => void {
  let entry = endpointPlugins.get(pluginId);
  if (!entry) {
    const dispose = registerEndpointProvider({
      id: `plugin:${pluginId}`,
      endpoints: async (root): Promise<EndpointEntry[]> =>
        (await pluginsBackend().endpoints(pluginId)).map((e) => ({
          method: e.method ?? "*",
          url: e.path,
          framework: e.framework,
          handler: e.handler ?? undefined,
          controller: e.framework,
          methodName: e.handler ?? "",
          pluginId,
          path: e.location.path,
          rel: e.location.path.startsWith(`${root}/`) ? e.location.path.slice(root.length + 1) : e.location.path,
          line: e.location.range.start.line,
          col: e.location.range.start.col,
        })),
    });
    entry = { declarations: 0, dispose };
    endpointPlugins.set(pluginId, entry);
  }
  const held = entry;
  held.declarations++;
  return () => {
    if (--held.declarations > 0) return;
    held.dispose();
    endpointPlugins.delete(pluginId);
  };
}

/** Registers the client side of every first-party UI point. */
export function defineBuiltinUiPoints(): () => void {
  const disposers = [
    defineUiPoint("endpoints", { project: ({ pluginId }) => providePluginEndpoints(pluginId) }),
    defineUiPoint<CommandDecl>("commands", {
      title: "Commands",
      project: ({ pluginId, decl }, { plugin }) =>
        registerAction({
          id: pluginActionId(pluginId, decl.id),
          title: decl.title,
          category: decl.category ?? plugin.name,
          icon: "package",
          when: decl.when ?? undefined,
          verbatim: true,
          keywords: ["plugin", plugin.name, pluginId],
          description: tx`From plugin ${plugin.name}`,
          run: async ({ arg }) => {
            const [path, paths] = commandArgs(arg);
            await runPluginCommand(pluginId, decl.id, path, paths);
          },
        }),
      Details: CommandsDetails,
    }),
    // Offered by every theme picker while the plugin is live; `followThemeSetting` applies the selected one.
    defineUiPoint<ThemeDef>("themes", {
      title: "Themes",
      project: ({ pluginId, decl }, { plugin }) =>
        addContributedTheme({
          id: pluginThemeRef(pluginId, decl.id),
          label: decl.name,
          kind: decl.kind === "light" ? "light" : "dark",
          origin: plugin.name,
        }),
      Details: ThemesDetails,
    }),
    defineUiPoint<IconThemeDecl>("iconThemes", {
      title: "File Icon Themes",
      project: ({ pluginId, decl }, { plugin }) =>
        addIconTheme({
          pluginId,
          id: decl.id,
          label: decl.label,
          origin: plugin.name,
          settingsPage: `${pluginSettingsPageId(pluginId)}.${decl.id.replace(/\./g, "-")}`,
        }),
      Details: IconThemesDetails,
    }),
    // Stored by the backend; listed here with a field per secret.
    defineUiPoint<SecretDecl>("secrets", { title: "Secrets", Details: SecretsDetails }),
    defineViewUiPoints(),
  ];
  return () => disposers.reverse().forEach((d) => d());
}