/** Registry-bound plugin command selection and execution for native/channel surfaces. */
import { normalizeOptionalLowercaseString } from "@openclaw/normalization-core/string-coerce";
import type { OpenClawConfig } from "../config/types.openclaw.js";
import type { RegisteredPluginCommand } from "./command-registry-state.js";
import { retainPluginCommandCatalogForCurrentAccount } from "./plugin-command-account-start-scope.js";
import {
  PLUGIN_COMMAND_DISPATCH,
  type PluginCommandReplyOptions,
} from "./plugin-command-dispatch-contract.js";
import { matchRegisteredPluginCommand } from "./plugin-command-matcher.js";
import {
  pluginCommandSupportsChannel,
  projectPluginCommandNativeMetadata,
} from "./plugin-command-metadata.js";
import {
  listRegisteredPluginCommands,
  resolveSelectedPluginCommandRegistry,
} from "./plugin-command-registry.js";
import { isPluginRegistryRetired } from "./registry-lifecycle.js";
import type { PluginRegistry } from "./registry-types.js";
import type { PluginCommandContext, PluginCommandResult } from "./types.js";

export { PLUGIN_COMMAND_DISPATCH };
export type { PluginCommandReplyOptions };

declare const pluginCommandDispatchBrand: unique symbol;

export type PluginCommandDispatchContext = Readonly<{
  senderId?: string;
  channel: string;
  channelId?: PluginCommandContext["channelId"];
  isAuthorizedSender: boolean;
  senderIsOwner?: boolean;
  gatewayClientScopes?: PluginCommandContext["gatewayClientScopes"];
  agentId?: string;
  sessionKey?: PluginCommandContext["sessionKey"];
  sessionId?: PluginCommandContext["sessionId"];
  sessionTarget?: PluginCommandContext["sessionTarget"];
  sessionFile?: PluginCommandContext["sessionFile"];
  authProfileId?: string;
  commandBody: string;
  config: OpenClawConfig;
  from?: PluginCommandContext["from"];
  to?: PluginCommandContext["to"];
  originatingTo?: string;
  accountId?: PluginCommandContext["accountId"];
  messageThreadId?: PluginCommandContext["messageThreadId"];
  threadParentId?: PluginCommandContext["threadParentId"];
  diagnosticsSessions?: PluginCommandContext["diagnosticsSessions"];
  diagnosticsUploadApproved?: PluginCommandContext["diagnosticsUploadApproved"];
  diagnosticsPreviewOnly?: PluginCommandContext["diagnosticsPreviewOnly"];
  diagnosticsPrivateRouted?: PluginCommandContext["diagnosticsPrivateRouted"];
}>;

/** Opaque capability bound to one selected command in one registry generation. */
export type PluginCommandDispatch = Readonly<{
  kind: "plugin";
  execute: (context: PluginCommandDispatchContext) => Promise<PluginCommandResult>;
  [pluginCommandDispatchBrand]: true;
}>;

export type PluginCommandCatalogDecision = PluginCommandDispatch | Readonly<{ kind: "non-plugin" }>;

/** Internal reply-pipeline view after the opaque catalog decision has been validated. */
export type PluginCommandExecutionReplyOptions = Readonly<{
  [PLUGIN_COMMAND_DISPATCH]?: PluginCommandCatalogDecision;
}>;

export type PluginCommandNativeCandidate = Readonly<{
  name: string;
  description: string;
  descriptionLocalizations?: Readonly<Record<string, string>>;
  acceptsArgs: boolean;
  requireAuth: boolean;
  progressMessage?: string;
  prepareDispatch: (rawArgs?: string) => PluginCommandCatalogDecision;
}>;

type PluginCommandInvocationMatch = Readonly<{
  dispatch: PluginCommandDispatch;
  acceptsArgs: boolean;
  requireAuth: boolean;
  progressMessage?: string;
}>;

export type PluginCommandRuntime = Readonly<{
  listNativeCandidates: (provider: string) => readonly PluginCommandNativeCandidate[];
  retainNativeCatalog: (provider: string) => void;
}>;

type PluginCommandRuntimeState = Readonly<{
  registry: PluginRegistry;
  commands: readonly RegisteredPluginCommand[];
}>;

type SelectedCommand = {
  runtime: PluginCommandRuntime;
  registry: PluginRegistry;
  channel: string;
  command: RegisteredPluginCommand;
  args?: string;
};

const dispatchSelections = new WeakMap<object, SelectedCommand>();
const runtimeStates = new WeakMap<PluginCommandRuntime, PluginCommandRuntimeState>();

const INVALID_SELECTION_REPLY = {
  text: "⚠️ This command selection is no longer valid. Please try again.",
} as const;
const RETIRED_SELECTION_REPLY = {
  text: "⚠️ This command is no longer available after the plugin registry changed. Please try again.",
} as const;

function createSelectedPluginCommandDispatch(
  runtime: PluginCommandRuntime,
  state: PluginCommandRuntimeState,
  command: RegisteredPluginCommand,
  channel: string,
  args?: string,
): PluginCommandDispatch {
  const dispatch = Object.freeze({
    kind: "plugin" as const,
    async execute(this: PluginCommandDispatch, context: PluginCommandDispatchContext) {
      if (this !== dispatch) {
        return { ...INVALID_SELECTION_REPLY };
      }
      return await executeSelectedPluginCommand(runtime, dispatch, context);
    },
  }) as PluginCommandDispatch;
  dispatchSelections.set(dispatch as object, {
    runtime,
    registry: state.registry,
    command,
    channel: normalizeOptionalLowercaseString(channel) ?? "",
    ...(args?.trim() ? { args: args.trim() } : {}),
  });
  return dispatch;
}

async function executeSelectedPluginCommand(
  runtime: PluginCommandRuntime | undefined,
  dispatch: PluginCommandDispatch,
  context: PluginCommandDispatchContext,
): Promise<PluginCommandResult> {
  const selected = dispatchSelections.get(dispatch as object);
  if (!selected || (runtime && selected.runtime !== runtime)) {
    return { ...INVALID_SELECTION_REPLY };
  }
  if (isPluginRegistryRetired(selected.registry)) {
    return { ...RETIRED_SELECTION_REPLY };
  }
  const channel = normalizeOptionalLowercaseString(context.channel) ?? "";
  if (selected.channel !== channel) {
    return { ...INVALID_SELECTION_REPLY };
  }
  const { executeRegisteredPluginCommand } = await import("./plugin-command-execution.js");
  if (isPluginRegistryRetired(selected.registry)) {
    return { ...RETIRED_SELECTION_REPLY };
  }
  return await executeRegisteredPluginCommand(selected.registry, {
    ...context,
    args: selected.args,
    command: selected.command,
  });
}

/** Validates and executes a dispatch carried through the core reply pipeline. */
export async function executePluginCommandDispatch(
  dispatch: PluginCommandDispatch,
  context: PluginCommandDispatchContext,
): Promise<PluginCommandResult> {
  return await executeSelectedPluginCommand(undefined, dispatch, context);
}

/** Creates one command runtime bound permanently to the current scoped registry generation. */
export function createPluginCommandRuntime(): PluginCommandRuntime {
  const registry = resolveSelectedPluginCommandRegistry();
  if (!registry) {
    throw new Error("Plugin command runtime requires an active or request-scoped registry.");
  }
  const state: PluginCommandRuntimeState = Object.freeze({
    registry,
    commands: Object.freeze(listRegisteredPluginCommands(registry)),
  });

  const assertCurrent = () => {
    if (isPluginRegistryRetired(state.registry)) {
      throw new Error("Plugin command runtime is bound to a retired registry generation.");
    }
  };

  const runtime: PluginCommandRuntime = Object.freeze({
    listNativeCandidates(provider: string): readonly PluginCommandNativeCandidate[] {
      assertCurrent();
      const channel = normalizeOptionalLowercaseString(provider) ?? "";
      return Object.freeze(
        state.commands
          .filter((command) => pluginCommandSupportsChannel(command, channel))
          .map((command) => {
            const metadata = projectPluginCommandNativeMetadata(command, channel);
            return Object.freeze({
              ...metadata,
              prepareDispatch(rawArgs?: string): PluginCommandCatalogDecision {
                const args = rawArgs?.trim();
                if (args && !command.acceptsArgs) {
                  return Object.freeze({ kind: "non-plugin" as const });
                }
                return createSelectedPluginCommandDispatch(runtime, state, command, channel, args);
              },
            });
          }),
      );
    },
    retainNativeCatalog(provider: string): void {
      assertCurrent();
      const channel = normalizeOptionalLowercaseString(provider) ?? "";
      if (!state.commands.some((command) => pluginCommandSupportsChannel(command, channel))) {
        return;
      }
      retainPluginCommandCatalogForCurrentAccount(channel);
    },
  });
  runtimeStates.set(runtime, state);
  return runtime;
}

/** Core-only text matcher that returns a dispatch from the same bound runtime. */
export function matchPluginCommandInvocation(
  runtime: PluginCommandRuntime,
  commandBody: string,
  options: { channel: string; provider?: string },
): PluginCommandInvocationMatch | null {
  const state = runtimeStates.get(runtime);
  if (!state) {
    return null;
  }
  if (isPluginRegistryRetired(state.registry)) {
    throw new Error("Plugin command runtime is bound to a retired registry generation.");
  }
  const channel = normalizeOptionalLowercaseString(options.channel) ?? "";
  const provider = normalizeOptionalLowercaseString(options.provider) ?? channel;
  const match = matchRegisteredPluginCommand({
    commands: state.commands,
    commandBody,
    channel,
    aliasScope: { kind: "provider", provider },
  });
  if (!match) {
    return null;
  }
  const metadata = projectPluginCommandNativeMetadata(match.command, provider);
  return Object.freeze({
    dispatch: createSelectedPluginCommandDispatch(
      runtime,
      state,
      match.command,
      channel,
      match.args,
    ),
    acceptsArgs: metadata.acceptsArgs,
    requireAuth: metadata.requireAuth,
    ...(metadata.progressMessage ? { progressMessage: metadata.progressMessage } : {}),
  });
}