import { DEFAULT_ACCOUNT_ID, type OpenClawConfig } from "openclaw/plugin-sdk/account-resolution";
import { registerPluginHttpRoute } from "openclaw/plugin-sdk/webhook-ingress";
import { listAccountIds, resolveAccount } from "./accounts.js";
import { dispatchSynologyChatInboundTurn } from "./inbound-turn.js";
import type { ResolvedSynologyChatAccount } from "./types.js";
import { createWebhookHandler, type WebhookHandlerDeps } from "./webhook-handler.js";

const CHANNEL_ID = "synology-chat";

type SynologyGatewayLog = {
  info?: (message: string) => void;
  warn?: (message: string) => void;
  error?: (message: string) => void;
};
type SynologyGatewayStartupIssueCode =
  | "disabled"
  | "missing-credentials"
  | "empty-allowlist"
  | "inherited-shared-webhook-path"
  | "duplicate-webhook-path";
type SynologyGatewayStartupIssue = {
  code: SynologyGatewayStartupIssueCode;
  logLevel: "info" | "warn";
  message: string;
};

const activeRouteUnregisters = new Map<string, () => void>();

function buildStartupIssue(
  code: SynologyGatewayStartupIssueCode,
  message: string,
  logLevel: "info" | "warn" = "warn",
): SynologyGatewayStartupIssue {
  return { code, logLevel, message };
}

function logStartupIssues(
  log: SynologyGatewayLog | undefined,
  issues: SynologyGatewayStartupIssue[],
) {
  for (const issue of issues) {
    const message = `Synology Chat ${issue.message}`;
    if (issue.logLevel === "info") {
      log?.info?.(message);
      continue;
    }
    log?.warn?.(message);
  }
}

function getRouteKey(account: ResolvedSynologyChatAccount): string {
  return `${account.accountId}:${account.webhookPath}`;
}

function createUnknownArgsLogAdapter(
  log?: SynologyGatewayLog,
): WebhookHandlerDeps["log"] | undefined {
  if (!log) {
    return undefined;
  }
  const formatArg = (value: unknown): string =>
    typeof value === "string" ? value : value instanceof Error ? value.message : "";
  return {
    info: (...args) => log.info?.(formatArg(args[0])),
    warn: (...args) => log.warn?.(formatArg(args[0])),
    error: (...args) => log.error?.(formatArg(args[0])),
  };
}

export function collectSynologyGatewayStartupIssues(params: {
  cfg: OpenClawConfig;
  account: ResolvedSynologyChatAccount;
  accountId: string;
}): SynologyGatewayStartupIssue[] {
  const { cfg, account, accountId } = params;
  const issues: SynologyGatewayStartupIssue[] = [];

  if (!account.enabled) {
    issues.push(
      buildStartupIssue("disabled", `account ${accountId} is disabled, skipping`, "info"),
    );
    return issues;
  }
  if (!account.token || !account.incomingUrl) {
    issues.push(
      buildStartupIssue(
        "missing-credentials",
        `account ${accountId} not fully configured (missing token or incomingUrl)`,
      ),
    );
  }
  if (account.dmPolicy === "allowlist" && account.allowedUserIds.length === 0) {
    issues.push(
      buildStartupIssue(
        "empty-allowlist",
        `account ${accountId} has dmPolicy=allowlist but empty allowedUserIds; refusing to start route`,
      ),
    );
  }

  const accountIds = listAccountIds(cfg);
  const isMultiAccount = accountIds.length > 1;
  if (
    isMultiAccount &&
    accountId !== DEFAULT_ACCOUNT_ID &&
    account.webhookPathSource === "inherited-base" &&
    !account.dangerouslyAllowInheritedWebhookPath
  ) {
    issues.push(
      buildStartupIssue(
        "inherited-shared-webhook-path",
        `account ${accountId} must set an explicit webhookPath in multi-account setups; refusing inherited shared path. Set channels.synology-chat.accounts.${accountId}.webhookPath or opt in with dangerouslyAllowInheritedWebhookPath=true.`,
      ),
    );
  }

  const conflictingAccounts = accountIds.filter((candidateId) => {
    if (candidateId === accountId) {
      return false;
    }
    const candidate = resolveAccount(cfg, candidateId);
    return candidate.enabled && candidate.webhookPath === account.webhookPath;
  });
  if (conflictingAccounts.length > 0) {
    issues.push(
      buildStartupIssue(
        "duplicate-webhook-path",
        `account ${accountId} conflicts on webhookPath ${account.webhookPath} with ${conflictingAccounts.join(", ")}; refusing to start ambiguous shared route.`,
      ),
    );
  }

  return issues;
}

export function collectSynologyGatewayRoutingWarnings(params: {
  cfg: OpenClawConfig;
  account: ResolvedSynologyChatAccount;
}): string[] {
  return collectSynologyGatewayStartupIssues({
    cfg: params.cfg,
    account: params.account,
    accountId: params.account.accountId,
  })
    .filter(
      (issue) =>
        issue.code === "inherited-shared-webhook-path" || issue.code === "duplicate-webhook-path",
    )
    .map((issue) => `- Synology Chat: ${issue.message}`);
}

export function validateSynologyGatewayAccountStartup(params: {
  cfg: OpenClawConfig;
  account: ResolvedSynologyChatAccount;
  accountId: string;
  log?: SynologyGatewayLog;
}): { ok: true } | { ok: false } {
  const issues = collectSynologyGatewayStartupIssues(params);
  if (issues.length > 0) {
    logStartupIssues(params.log, issues);
    return { ok: false };
  }
  return { ok: true };
}

export function registerSynologyWebhookRoute(params: {
  account: ResolvedSynologyChatAccount;
  accountId: string;
  log?: SynologyGatewayLog;
}): () => void {
  const { account, log } = params;
  const routeKey = getRouteKey(account);
  const prevUnregister = activeRouteUnregisters.get(routeKey);
  if (prevUnregister) {
    log?.info?.(`Deregistering stale route before re-registering: ${account.webhookPath}`);
    prevUnregister();
    activeRouteUnregisters.delete(routeKey);
  }

  const handler = createWebhookHandler({
    account,
    deliver: async (msg) =>
      await dispatchSynologyChatInboundTurn({
        account,
        msg,
        log: createUnknownArgsLogAdapter(log),
      }),
    log: createUnknownArgsLogAdapter(log),
  });
  const unregister = registerPluginHttpRoute({
    path: account.webhookPath,
    auth: "plugin",
    pluginId: CHANNEL_ID,
    accountId: account.accountId,
    log: (msg: string) => log?.info?.(msg),
    handler,
  });
  activeRouteUnregisters.set(routeKey, unregister);
  return () => {
    unregister();
    activeRouteUnregisters.delete(routeKey);
  };
}