/**
 * Host editor sections contributed by plugins.
 *
 * A plugin declares host-scope fields in its manifest and core draws them, so
 * a plugin cannot ship its own form styling and a section disappears when its
 * plugin does. The enable switch comes first and gates the rest, which is the
 * shape the hardcoded feature tabs already have.
 *
 * Nothing is rendered when no enabled plugin declares host settings, so the
 * group does not appear as an empty tab.
 */

import { useMemo } from "react";
import { useTranslation } from "react-i18next";
import { SectionCard } from "@/components/section-card";
import { DocsLink } from "@/components/docs-link";
import { PluginIcon } from "@/lib/plugin-icon";
import { pluginName } from "@/lib/plugin-i18n";
import { type PluginSummary } from "@/api/plugins-api";
import { useInstalledPlugins } from "@/hooks/use-installed-plugins";
import { usePluginScope } from "@/plugin-host/scope";
import { SettingsFieldRow } from "./SettingsFields";
import { hasVisibleFields, isFieldShown } from "./settings-fields-util";

/** Values for every plugin on one host: { [pluginId]: { [key]: value } }. */
export type HostPluginSettings = Record<string, Record<string, unknown>>;

/** Enabled plugins declaring host-scope settings. */
export function usePluginHostSections(): PluginSummary[] {
  const plugins = useInstalledPlugins();

  return useMemo(
    () =>
      plugins.filter((plugin) => {
        if (!plugin.enabled) return false;
        const host = plugin.contributes?.settings?.host;
        return !!host && (hasVisibleFields(host.fields) || !!host.enableKey);
      }),
    [plugins],
  );
}

/** What each field reads before the host saves it. */
function hostFieldDefaults(plugin: PluginSummary): Record<string, unknown> {
  const host = plugin.contributes?.settings?.host;
  if (!host) return {};
  const defaults: Record<string, unknown> = {};
  if (host.enableKey) defaults[host.enableKey] = host.enableDefault ?? false;
  for (const field of host.fields) {
    if (field.default !== undefined) defaults[field.key] = field.default;
  }
  return defaults;
}

export interface HostPluginSectionsProps {
  plugins: PluginSummary[];
  values: HostPluginSettings;
  setValue: (pluginId: string, key: string, value: unknown) => void;
}

export function HostPluginSections({
  plugins,
  values,
  setValue,
}: HostPluginSectionsProps) {
  if (plugins.length === 0) return null;

  return (
    <div className="flex flex-col gap-2">
      {plugins.map((plugin) => (
        <HostPluginSection
          key={plugin.id}
          plugin={plugin}
          values={values[plugin.id] ?? {}}
          setValue={(key, value) => setValue(plugin.id, key, value)}
        />
      ))}
    </div>
  );
}

export interface HostFeatureFieldsProps {
  // The host editor form, as handed to a host editor section.
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  form: any;
  updateForm: (
    patch: (form: Record<string, unknown>) => Record<string, unknown>,
  ) => void;
}

/**
 * The calling plugin's manifest host settings, for a plugin that registered
 * its own host editor section and so gets no generated tab.
 */
export function HostFeatureFields({
  form,
  updateForm,
}: HostFeatureFieldsProps) {
  const pluginId = usePluginScope();
  const plugin = usePluginHostSections().find((p) => p.id === pluginId);
  if (!plugin) return null;
  const values = (form?.pluginSettings as HostPluginSettings | undefined) ?? {};
  return (
    <HostPluginSection
      plugin={plugin}
      values={values[plugin.id] ?? {}}
      setValue={(key, value) =>
        updateForm((current) => {
          const all = (current.pluginSettings ?? {}) as HostPluginSettings;
          return {
            ...current,
            pluginSettings: {
              ...all,
              [plugin.id]: { ...(all[plugin.id] ?? {}), [key]: value },
            },
          };
        })
      }
    />
  );
}

function HostPluginSection({
  plugin,
  values,
  setValue,
}: {
  plugin: PluginSummary;
  values: Record<string, unknown>;
  setValue: (key: string, value: unknown) => void;
}) {
  const { t } = useTranslation();
  const host = plugin.contributes?.settings?.host;
  if (!host) return null;
  const shown = { ...hostFieldDefaults(plugin), ...values };

  const running = plugin.enabled && plugin.state !== "failed";
  const enableKey = host.enableKey;
  // With no enable switch the section is always on, which is what a plugin
  // declaring only plain fields means.
  const enabled = enableKey ? shown[enableKey] === true : true;

  return (
    <SectionCard
      title={pluginName(t, plugin)}
      icon={<PluginIcon name={plugin.icon} className="size-3.5" />}
      action={<DocsLink href={plugin.docs} />}
    >
      {!running && (
        <div className="my-3 border border-warning/40 bg-warning/10 px-3 py-2 text-xs text-warning">
          {t("settings.featureUnavailable", {
            name: pluginName(t, plugin),
          })}
        </div>
      )}

      {enableKey && (
        <SettingsFieldRow
          pluginId={plugin.id}
          field={{
            key: enableKey,
            type: "boolean",
            labelKey: host.enableLabelKey,
            descriptionKey: host.enableDescriptionKey,
          }}
          values={shown}
          setValue={setValue}
          running={running}
          defaultKey={`${plugin.id}.${enableKey}`}
        />
      )}

      {enabled &&
        host.fields
          .filter((field) => isFieldShown(field, shown))
          .map((field) => (
            <SettingsFieldRow
              key={field.key}
              pluginId={plugin.id}
              field={field}
              values={shown}
              setValue={setValue}
              running={running}
              defaultKey={`${plugin.id}.${field.key}`}
            />
          ))}
    </SectionCard>
  );
}