import { randomUUID } from "node:crypto";
import { normalizeModelRef, parseModelRef } from "../agents/model-selection.js";
import type { loadConfig } from "../config/config.js";
import { resolveGatewayStartupPluginIds } from "../plugins/channel-plugin-ids.js";
import { normalizePluginsConfig } from "../plugins/config-state.js";
import { loadOpenClawPlugins } from "../plugins/loader.js";
import { getPluginRuntimeGatewayRequestScope } from "../plugins/runtime/gateway-request-scope.js";
import type { PluginRuntime } from "../plugins/runtime/types.js";
import { resolveGlobalSingleton } from "../shared/global-singleton.js";
import { ADMIN_SCOPE, WRITE_SCOPE } from "./method-scopes.js";
import { GATEWAY_CLIENT_IDS, GATEWAY_CLIENT_MODES } from "./protocol/client-info.js";
import type { ErrorShape } from "./protocol/index.js";
import { PROTOCOL_VERSION } from "./protocol/index.js";
import { handleGatewayRequest } from "./server-methods.js";
import type {
  GatewayRequestContext,
  GatewayRequestHandler,
  GatewayRequestOptions,
} from "./server-methods/types.js";

// ── Fallback gateway context for non-WS paths (Telegram, WhatsApp, etc.) ──
// The WS path sets a per-request scope via AsyncLocalStorage, but channel
// adapters (Telegram polling, etc.) invoke the agent directly without going
// through handleGatewayRequest. We store the gateway context at startup so
// dispatchGatewayMethod can use it as a fallback.

const FALLBACK_GATEWAY_CONTEXT_STATE_KEY: unique symbol = Symbol.for(
  "openclaw.fallbackGatewayContextState",
);

type FallbackGatewayContextState = {
  context: GatewayRequestContext | undefined;
  resolveContext: (() => GatewayRequestContext | undefined) | undefined;
};

const getFallbackGatewayContextState = () =>
  resolveGlobalSingleton<FallbackGatewayContextState>(FALLBACK_GATEWAY_CONTEXT_STATE_KEY, () => ({
    context: undefined,
    resolveContext: undefined,
  }));

export function setFallbackGatewayContext(ctx: GatewayRequestContext): void {
  const fallbackGatewayContextState = getFallbackGatewayContextState();
  fallbackGatewayContextState.context = ctx;
  fallbackGatewayContextState.resolveContext = undefined;
}

export function setFallbackGatewayContextResolver(
  resolveContext: () => GatewayRequestContext | undefined,
): void {
  const fallbackGatewayContextState = getFallbackGatewayContextState();
  fallbackGatewayContextState.resolveContext = resolveContext;
}

function getFallbackGatewayContext(): GatewayRequestContext | undefined {
  const fallbackGatewayContextState = getFallbackGatewayContextState();
  const resolved = fallbackGatewayContextState.resolveContext?.();
  return resolved ?? fallbackGatewayContextState.context;
}

type PluginSubagentOverridePolicy = {
  allowModelOverride: boolean;
  allowAnyModel: boolean;
  hasConfiguredAllowlist: boolean;
  allowedModels: Set<string>;
};

type PluginSubagentPolicyState = {
  policies: Record<string, PluginSubagentOverridePolicy>;
};

const PLUGIN_SUBAGENT_POLICY_STATE_KEY: unique symbol = Symbol.for(
  "openclaw.pluginSubagentOverridePolicyState",
);

const getPluginSubagentPolicyState = () =>
  resolveGlobalSingleton<PluginSubagentPolicyState>(PLUGIN_SUBAGENT_POLICY_STATE_KEY, () => ({
    policies: {},
  }));

function normalizeAllowedModelRef(raw: string): string | null {
  const trimmed = raw.trim();
  if (!trimmed) {
    return null;
  }
  if (trimmed === "*") {
    return "*";
  }
  const slash = trimmed.indexOf("/");
  if (slash <= 0 || slash >= trimmed.length - 1) {
    return null;
  }
  const providerRaw = trimmed.slice(0, slash).trim();
  const modelRaw = trimmed.slice(slash + 1).trim();
  if (!providerRaw || !modelRaw) {
    return null;
  }
  const normalized = normalizeModelRef(providerRaw, modelRaw);
  return `${normalized.provider}/${normalized.model}`;
}

export function setPluginSubagentOverridePolicies(cfg: ReturnType<typeof loadConfig>): void {
  const pluginSubagentPolicyState = getPluginSubagentPolicyState();
  const normalized = normalizePluginsConfig(cfg.plugins);
  const policies: PluginSubagentPolicyState["policies"] = {};
  for (const [pluginId, entry] of Object.entries(normalized.entries)) {
    const allowModelOverride = entry.subagent?.allowModelOverride === true;
    const hasConfiguredAllowlist = entry.subagent?.hasAllowedModelsConfig === true;
    const configuredAllowedModels = entry.subagent?.allowedModels ?? [];
    const allowedModels = new Set<string>();
    let allowAnyModel = false;
    for (const modelRef of configuredAllowedModels) {
      const normalizedModelRef = normalizeAllowedModelRef(modelRef);
      if (!normalizedModelRef) {
        continue;
      }
      if (normalizedModelRef === "*") {
        allowAnyModel = true;
        continue;
      }
      allowedModels.add(normalizedModelRef);
    }
    if (
      !allowModelOverride &&
      !hasConfiguredAllowlist &&
      allowedModels.size === 0 &&
      !allowAnyModel
    ) {
      continue;
    }
    policies[pluginId] = {
      allowModelOverride,
      allowAnyModel,
      hasConfiguredAllowlist,
      allowedModels,
    };
  }
  pluginSubagentPolicyState.policies = policies;
}

function authorizeFallbackModelOverride(params: {
  pluginId?: string;
  provider?: string;
  model?: string;
}): { allowed: true } | { allowed: false; reason: string } {
  const pluginSubagentPolicyState = getPluginSubagentPolicyState();
  const pluginId = params.pluginId?.trim();
  if (!pluginId) {
    return {
      allowed: false,
      reason: "provider/model override requires plugin identity in fallback subagent runs.",
    };
  }
  const policy = pluginSubagentPolicyState.policies[pluginId];
  if (!policy?.allowModelOverride) {
    return {
      allowed: false,
      reason:
        `plugin "${pluginId}" is not trusted for fallback provider/model override requests. ` +
        "See https://docs.openclaw.ai/tools/plugin#runtime-helpers and search for: " +
        "plugins.entries.<id>.subagent.allowModelOverride",
    };
  }
  if (policy.allowAnyModel) {
    return { allowed: true };
  }
  if (policy.hasConfiguredAllowlist && policy.allowedModels.size === 0) {
    return {
      allowed: false,
      reason: `plugin "${pluginId}" configured subagent.allowedModels, but none of the entries normalized to a valid provider/model target.`,
    };
  }
  if (policy.allowedModels.size === 0) {
    return { allowed: true };
  }
  const requestedModelRef = resolveRequestedFallbackModelRef(params);
  if (!requestedModelRef) {
    return {
      allowed: false,
      reason:
        "fallback provider/model overrides that use an allowlist must resolve to a canonical provider/model target.",
    };
  }
  if (policy.allowedModels.has(requestedModelRef)) {
    return { allowed: true };
  }
  return {
    allowed: false,
    reason: `model override "${requestedModelRef}" is not allowlisted for plugin "${pluginId}".`,
  };
}

function resolveRequestedFallbackModelRef(params: {
  provider?: string;
  model?: string;
}): string | null {
  if (params.provider && params.model) {
    const normalizedRequest = normalizeModelRef(params.provider, params.model);
    return `${normalizedRequest.provider}/${normalizedRequest.model}`;
  }
  const rawModel = params.model?.trim();
  if (!rawModel || !rawModel.includes("/")) {
    return null;
  }
  const parsed = parseModelRef(rawModel, "");
  if (!parsed?.provider || !parsed.model) {
    return null;
  }
  return `${parsed.provider}/${parsed.model}`;
}

// ── Internal gateway dispatch for plugin runtime ────────────────────

function createSyntheticOperatorClient(params?: {
  allowModelOverride?: boolean;
  scopes?: string[];
}): GatewayRequestOptions["client"] {
  return {
    connect: {
      minProtocol: PROTOCOL_VERSION,
      maxProtocol: PROTOCOL_VERSION,
      client: {
        id: GATEWAY_CLIENT_IDS.GATEWAY_CLIENT,
        version: "internal",
        platform: "node",
        mode: GATEWAY_CLIENT_MODES.BACKEND,
      },
      role: "operator",
      scopes: params?.scopes ?? [WRITE_SCOPE],
    },
    internal: {
      allowModelOverride: params?.allowModelOverride === true,
    },
  };
}

function hasAdminScope(client: GatewayRequestOptions["client"]): boolean {
  const scopes = Array.isArray(client?.connect?.scopes) ? client.connect.scopes : [];
  return scopes.includes(ADMIN_SCOPE);
}

function canClientUseModelOverride(client: GatewayRequestOptions["client"]): boolean {
  return hasAdminScope(client) || client?.internal?.allowModelOverride === true;
}

async function dispatchGatewayMethod<T>(
  method: string,
  params: Record<string, unknown>,
  options?: {
    allowSyntheticModelOverride?: boolean;
    syntheticScopes?: string[];
  },
): Promise<T> {
  const scope = getPluginRuntimeGatewayRequestScope();
  const context = scope?.context ?? getFallbackGatewayContext();
  const isWebchatConnect = scope?.isWebchatConnect ?? (() => false);
  if (!context) {
    throw new Error(
      `Plugin subagent dispatch requires a gateway request scope (method: ${method}). No scope set and no fallback context available.`,
    );
  }

  let result: { ok: boolean; payload?: unknown; error?: ErrorShape } | undefined;
  await handleGatewayRequest({
    req: {
      type: "req",
      id: `plugin-subagent-${randomUUID()}`,
      method,
      params,
    },
    client:
      scope?.client ??
      createSyntheticOperatorClient({
        allowModelOverride: options?.allowSyntheticModelOverride === true,
        scopes: options?.syntheticScopes,
      }),
    isWebchatConnect,
    respond: (ok, payload, error) => {
      if (!result) {
        result = { ok, payload, error };
      }
    },
    context,
  });

  if (!result) {
    throw new Error(`Gateway method "${method}" completed without a response.`);
  }
  if (!result.ok) {
    throw new Error(result.error?.message ?? `Gateway method "${method}" failed.`);
  }
  return result.payload as T;
}

export function createGatewaySubagentRuntime(): PluginRuntime["subagent"] {
  const getSessionMessages: PluginRuntime["subagent"]["getSessionMessages"] = async (params) => {
    const payload = await dispatchGatewayMethod<{ messages?: unknown[] }>("sessions.get", {
      key: params.sessionKey,
      ...(params.limit != null && { limit: params.limit }),
    });
    return { messages: Array.isArray(payload?.messages) ? payload.messages : [] };
  };

  return {
    async run(params) {
      const scope = getPluginRuntimeGatewayRequestScope();
      const overrideRequested = Boolean(params.provider || params.model);
      const hasRequestScopeClient = Boolean(scope?.client);
      let allowOverride = hasRequestScopeClient && canClientUseModelOverride(scope?.client ?? null);
      let allowSyntheticModelOverride = false;
      if (overrideRequested && !allowOverride && !hasRequestScopeClient) {
        const fallbackAuth = authorizeFallbackModelOverride({
          pluginId: scope?.pluginId,
          provider: params.provider,
          model: params.model,
        });
        if (!fallbackAuth.allowed) {
          throw new Error(fallbackAuth.reason);
        }
        allowOverride = true;
        allowSyntheticModelOverride = true;
      }
      if (overrideRequested && !allowOverride) {
        throw new Error("provider/model override is not authorized for this plugin subagent run.");
      }
      const payload = await dispatchGatewayMethod<{ runId?: string }>(
        "agent",
        {
          sessionKey: params.sessionKey,
          message: params.message,
          deliver: params.deliver ?? false,
          ...(allowOverride && params.provider && { provider: params.provider }),
          ...(allowOverride && params.model && { model: params.model }),
          ...(params.extraSystemPrompt && { extraSystemPrompt: params.extraSystemPrompt }),
          ...(params.lane && { lane: params.lane }),
          ...(params.idempotencyKey && { idempotencyKey: params.idempotencyKey }),
        },
        {
          allowSyntheticModelOverride,
        },
      );
      const runId = payload?.runId;
      if (typeof runId !== "string" || !runId) {
        throw new Error("Gateway agent method returned an invalid runId.");
      }
      return { runId };
    },
    async waitForRun(params) {
      const payload = await dispatchGatewayMethod<{ status?: string; error?: string }>(
        "agent.wait",
        {
          runId: params.runId,
          ...(params.timeoutMs != null && { timeoutMs: params.timeoutMs }),
        },
      );
      const status = payload?.status;
      if (status !== "ok" && status !== "error" && status !== "timeout") {
        throw new Error(`Gateway agent.wait returned unexpected status: ${status}`);
      }
      return {
        status,
        ...(typeof payload?.error === "string" && payload.error && { error: payload.error }),
      };
    },
    getSessionMessages,
    async getSession(params) {
      return getSessionMessages(params);
    },
    async deleteSession(params) {
      await dispatchGatewayMethod(
        "sessions.delete",
        {
          key: params.sessionKey,
          deleteTranscript: params.deleteTranscript ?? true,
        },
        {
          syntheticScopes: [ADMIN_SCOPE],
        },
      );
    },
  };
}

// ── Plugin loading ──────────────────────────────────────────────────

export function loadGatewayPlugins(params: {
  cfg: ReturnType<typeof loadConfig>;
  workspaceDir: string;
  log: {
    info: (msg: string) => void;
    warn: (msg: string) => void;
    error: (msg: string) => void;
    debug: (msg: string) => void;
  };
  coreGatewayHandlers: Record<string, GatewayRequestHandler>;
  baseMethods: string[];
  preferSetupRuntimeForChannelPlugins?: boolean;
}) {
  const pluginRegistry = loadOpenClawPlugins({
    config: params.cfg,
    workspaceDir: params.workspaceDir,
    onlyPluginIds: resolveGatewayStartupPluginIds({
      config: params.cfg,
      workspaceDir: params.workspaceDir,
      env: process.env,
    }),
    logger: {
      info: (msg) => params.log.info(msg),
      warn: (msg) => params.log.warn(msg),
      error: (msg) => params.log.error(msg),
      debug: (msg) => params.log.debug(msg),
    },
    coreGatewayHandlers: params.coreGatewayHandlers,
    runtimeOptions: {
      allowGatewaySubagentBinding: true,
    },
    preferSetupRuntimeForChannelPlugins: params.preferSetupRuntimeForChannelPlugins,
  });
  const pluginMethods = Object.keys(pluginRegistry.gatewayHandlers);
  const gatewayMethods = Array.from(new Set([...params.baseMethods, ...pluginMethods]));
  return { pluginRegistry, gatewayMethods };
}
