import type { AgentEnvPanelFocus } from "./agentEnvPanelActions";

/**
 * Run-failure codes actually emitted by the daemon runtime classifier
 * (packages/agent/daemon/runtime/visible_error.go `visibleFailureCode`). These
 * are the codes the conversation error card really receives — unlike the
 * aspirational `CODEX_*` codes, which the run pipeline never produces.
 *
 * Keep this union aligned with the Go switch in `visibleFailureCode`.
 */
export type AgentRunErrorCode =
  | "auth_required"
  | "account_not_allowed"
  | "billing_error"
  | "cli_not_found"
  | "cli_version_unsupported"
  | "network_error"
  | "runtime_unavailable"
  | "request_timed_out"
  | "provider_config_timeout"
  | "provider_stream_disconnected"
  | "provider_empty_response"
  | "provider_concurrency_limit"
  | "provider_unavailable"
  | "invalid_request"
  | "model_not_available"
  | "max_output_tokens"
  | "insufficient_credits"
  | "model_not_allowed"
  | "plugin_unavailable"
  | "quota_or_rate_limit"
  | "session_interrupted"
  | "subscription_required"
  | "process_exited"
  | "provider_error"
  | "unknown";

/**
 * Identifies who can remediate a visible error in the current AgentGUI view.
 * This is presentation-only host context; it does not alter canonical Turns
 * or provider error data.
 */
export type AgentVisibleErrorPresentationScope =
  | "local_owner"
  | "shared_caller";

export interface AgentVisibleErrorOverride {
  message: string;
  /** Provider ids for which this product-owned override is valid. */
  providers: readonly string[];
  action?: {
    label: string;
    url: string;
  } | null;
}

/**
 * Product-owned structured errors whose copy may be supplied by a Host.
 * Environment/runtime errors remain canonical AgentGUI policy.
 */
export type AgentVisibleErrorOverrideCode = "insufficient_credits";

export type AgentVisibleErrorOverrides = Partial<
  Record<AgentVisibleErrorOverrideCode, AgentVisibleErrorOverride>
>;

export interface AgentErrorPresentation {
  /**
   * i18n key for the one human sentence shown in the card, or null to let the
   * caller fall back to its phase-aware generic title.
   */
  messageKey: string | null;
  /**
   * Env-panel section the remediation button deep-links to, or null when the
   * failure is transient/server-side and the wizard cannot fix it — in which
   * case no call-to-action is shown (showing one would misrepresent reality).
   */
  focus: AgentEnvPanelFocus | null;
  /** i18n key for the remediation button. */
  actionKey: string | null;
  /** External remediation destination, when the action is account-level. */
  externalUrl?: string | null;
}

const NO_CTA = { focus: null, actionKey: null } as const;

const SHARED_CALLER_OWNER_REMEDIABLE_CODES: readonly string[] = [
  "auth_required",
  "cli_not_found",
  "cli_version_unsupported",
  "runtime_unavailable",
  "execution_start_failed",
  "execution_lost",
  "insufficient_credits",
  "subscription_required",
  "quota_exhausted",
  "model_not_allowed",
  "plugin_unavailable"
];

/**
 * Returns whether a structured failure requires the shared Agent owner to
 * remediate it. Transport and ambiguous failures deliberately stay neutral so
 * callers retain the existing retry guidance.
 */
export function isSharedCallerOwnerRemediableError(
  code: string | null | undefined
): boolean {
  return (
    typeof code === "string" &&
    SHARED_CALLER_OWNER_REMEDIABLE_CODES.includes(code)
  );
}

// The escape hatch for hard failures whose cause is ambiguous from the message
// alone (a non-zero exit, an unclassified provider error): send the user into
// the wizard to self-detect, but keep the generic message.
const SELF_DETECT = {
  messageKey: null,
  focus: "detect" as const,
  actionKey: "agentHost.agentGui.visibleErrorActionDetect"
};

const PRESENTATIONS: Record<AgentRunErrorCode, AgentErrorPresentation> = {
  // Environment problems the wizard can detect or repair → route to its step.
  auth_required: {
    messageKey: "agentHost.agentGui.visibleErrorAuthRequired",
    focus: "auth",
    actionKey: "agentHost.agentGui.visibleErrorActionRelogin"
  },
  account_not_allowed: { messageKey: null, ...NO_CTA },
  billing_error: { messageKey: null, ...NO_CTA },
  cli_not_found: {
    messageKey: "agentHost.agentGui.visibleErrorCliNotFound",
    focus: "install",
    actionKey: "agentHost.agentGui.visibleErrorActionInstall"
  },
  cli_version_unsupported: {
    messageKey: "agentHost.agentGui.visibleErrorVersionUnsupported",
    focus: "upgrade",
    actionKey: "agentHost.agentGui.visibleErrorActionUpgrade"
  },
  network_error: {
    messageKey: "agentHost.agentGui.visibleErrorNetwork",
    focus: "network",
    actionKey: "agentHost.agentGui.visibleErrorActionCheckNetwork"
  },
  runtime_unavailable: {
    messageKey: "agentHost.agentGui.visibleErrorRuntimeUnavailable",
    focus: "detect",
    actionKey: "agentHost.agentGui.visibleErrorActionDetect"
  },
  // Transient / server-side failures: accurate copy, but no wizard CTA — it
  // cannot fix a rate limit or a dropped stream.
  request_timed_out: {
    messageKey: "agentHost.agentGui.visibleErrorRequestTimedOut",
    ...NO_CTA
  },
  provider_config_timeout: {
    messageKey: "agentHost.agentGui.visibleErrorConfigTimeout",
    ...NO_CTA
  },
  provider_stream_disconnected: {
    messageKey: "agentHost.agentGui.visibleErrorStreamDisconnected",
    ...NO_CTA
  },
  provider_empty_response: {
    messageKey: "agentHost.agentGui.visibleErrorEmptyResponse",
    focus: "detect",
    actionKey: "agentHost.agentGui.visibleErrorActionDetect"
  },
  provider_concurrency_limit: {
    messageKey: "agentHost.agentGui.visibleErrorConcurrencyLimit",
    ...NO_CTA
  },
  provider_unavailable: { messageKey: null, ...NO_CTA },
  invalid_request: { messageKey: null, ...NO_CTA },
  model_not_available: { messageKey: null, ...NO_CTA },
  max_output_tokens: { messageKey: null, ...NO_CTA },
  insufficient_credits: {
    messageKey: "agentHost.agentGui.visibleErrorInsufficientCreditsUnknown",
    ...NO_CTA
  },
  model_not_allowed: {
    messageKey: "agentHost.agentGui.visibleErrorModelNotAllowed",
    ...NO_CTA
  },
  plugin_unavailable: {
    messageKey: "agentHost.agentGui.visibleErrorPluginUnavailable",
    ...NO_CTA
  },
  quota_or_rate_limit: {
    messageKey: "agentHost.agentGui.visibleErrorQuotaOrRateLimit",
    ...NO_CTA
  },
  session_interrupted: {
    messageKey: "agentHost.agentGui.visibleErrorSessionInterrupted",
    ...NO_CTA
  },
  subscription_required: {
    messageKey: "agentHost.agentGui.visibleErrorSubscriptionRequired",
    ...NO_CTA
  },
  // Ambiguous hard failures → generic message + self-detect escape hatch.
  process_exited: SELF_DETECT,
  provider_error: SELF_DETECT,
  unknown: SELF_DETECT
};

/**
 * Resolves the card presentation for a run-failure code. Returns null for codes
 * outside the known vocabulary so the caller renders its plain generic card with
 * no call-to-action.
 */
export function resolveAgentErrorPresentation(
  code: string | null | undefined,
  scope: AgentVisibleErrorPresentationScope = "local_owner"
): AgentErrorPresentation | null {
  if (!code) {
    return null;
  }
  const presentation = PRESENTATIONS[code as AgentRunErrorCode] ?? null;
  if (!presentation || scope !== "shared_caller") {
    return presentation;
  }
  // Shared callers must never be sent to the current device's Agent Env
  // wizard. The caller-contact copy is rendered separately for structured
  // Owner-remediable failures; transient failures preserve their current copy.
  return { ...presentation, ...NO_CTA };
}

const FAILED_MESSAGE_CODE_MARKERS: ReadonlyArray<
  readonly [AgentRunErrorCode, readonly string[]]
> = [
  [
    "subscription_required",
    [
      "unable to verify your membership benefits",
      "ensure your membership is active",
      "subscription does not have access",
      "current plan supports only",
      "membership expired",
      "subscription required"
    ]
  ],
  [
    "insufficient_credits",
    [
      "insufficient credits",
      "insufficient balance",
      "balance is insufficient",
      "402 payment required"
    ]
  ],
  ["provider_concurrency_limit", ["concurrency limit exceeded"]],
  [
    "quota_or_rate_limit",
    [
      "quota",
      "rate limit",
      "limit exceeded",
      "usage limit",
      "upgrade your plan to continue",
      "add a payment method to continue",
      "resource_exhausted",
      "too many requests",
      "status code: 429"
    ]
  ],
  ["model_not_allowed", ["model_not_allowed"]],
  ["request_timed_out", ["api error: 522", "error 522: connection timed out"]],
  [
    "auth_required",
    [
      "authentication_failed",
      "invalid authentication credentials",
      "401 invalid authentication",
      "unauthorized",
      "not logged in",
      "please run /login",
      "invalid api key"
    ]
  ],
  [
    "cli_version_unsupported",
    ["requires a newer version", "version is too old", "unsupported version"]
  ],
  [
    "cli_not_found",
    [
      "no such file or directory",
      "command not found",
      "enoent",
      "executable file not found"
    ]
  ],
  [
    "network_error",
    ["enotfound", "econnrefused", "econnreset", "getaddrinfo", "socket hang up"]
  ]
];

/**
 * Some providers (notably Claude Code) report an environment failure — e.g. a
 * dropped login (401) — as a plain failed assistant message rather than a
 * structured visibleError, so it never gets the remediation card. This recovers
 * the env-fixable code from that message's text so the caller can still route the
 * user to the wizard. Returns null when the text isn't a recognized env failure
 * (so transient/unknown failures stay plain).
 */
export function classifyFailedAgentMessage(
  body: string | null | undefined
): AgentRunErrorCode | null {
  if (!body) {
    return null;
  }
  const lower = body.toLowerCase();
  for (const [code, markers] of FAILED_MESSAGE_CODE_MARKERS) {
    if (markers.some((marker) => lower.includes(marker))) {
      return code;
    }
  }
  return null;
}

const COMPLETED_AUTH_MESSAGE_MAX_LENGTH = 160;
const COMPLETED_AUTH_MESSAGE_PATTERN =
  /^not logged in\s*(?:[·•:—-]|\.)?\s*please run\s+\/login[.!]?$/i;

/**
 * Resolves a plain assistant message that should be recovered into a visible
 * error card. Failed messages keep the provider-agnostic fallback above.
 *
 * Claude Code demonstrates why completed messages need a narrow exception: its
 * SDK can return the standalone "Not logged in · Please run /login" notice
 * together with a successful result. Match the provider-owned output shape,
 * rather than branching on provider identity, and keep it short and
 * whole-message anchored so normal answers are not reclassified.
 */
export function classifyRecoverableAgentMessage(input: {
  body: string | null | undefined;
  statusKind: string | null | undefined;
}): AgentRunErrorCode | null {
  if (input.statusKind === "failed") {
    return classifyFailedAgentMessage(input.body);
  }
  if (
    input.statusKind !== "completed" ||
    !input.body ||
    input.body.length > COMPLETED_AUTH_MESSAGE_MAX_LENGTH
  ) {
    return null;
  }
  return COMPLETED_AUTH_MESSAGE_PATTERN.test(input.body.trim())
    ? "auth_required"
    : null;
}