import { HOPPER_PUBLISHER } from "../domain/hopperPublisher.js";
import type { LinuxPackageInstallFailure } from "./LinuxHopper.js";

export type SetupFailureCode =
  | "unsupported_host"
  | "download_failed"
  | "integrity_mismatch"
  | "authorization_or_package_manager_failed"
  | "launcher_missing"
  | "runtime_dependency_unavailable"
  | "unsupported_hopper_build"
  | "setup_cancelled"
  | "destination_exists"
  | "mount_failed"
  | "bundle_invalid"
  | "publisher_verification_failed"
  | "copy_failed"
  | "skill_install_failed"
  | "cleanup_failed";

export type SetupHopperInstallResult =
  | {
      readonly status: "installed";
      readonly launcherPath: string;
      readonly cleanupFailure?: string;
      readonly warning?: string;
    }
  | {
      readonly status: "failed";
      readonly code: SetupFailureCode;
      readonly remediation: string;
    };

export type SetupHopperInstallFailure = Extract<
  SetupHopperInstallResult,
  { readonly status: "failed" }
>;

export type HopperInstallFailureReason =
  | "unsupported_host"
  | "release_metadata"
  | "download"
  | "integrity"
  | "authorization_or_package_manager"
  | "launcher_missing"
  | "runtime_dependencies"
  | "unsupported_hopper_build"
  | "cancelled"
  | "destination_exists"
  | "mount"
  | "bundle"
  | "publisher_verification_failed"
  | "copy";

const normalizePackageOutput = (output: string): string =>
  output
    .replace(/\u001b(?:\[[0-9;?]*[ -/]*[@-~]|\([0-9A-Za-z]|[@-Z\\^_])/gu, "")
    .replace(/[\u0000-\u0008\u000b\u000c\u000e-\u001f\u007f]/gu, "")
    .replace(/\s+/gu, " ")
    .trim();

const packageOutputExcerpt = (
  failure: LinuxPackageInstallFailure,
  limit = 400,
): string => {
  const output = [failure.stderr, failure.stdout]
    .map(normalizePackageOutput)
    .filter((text) => text !== "")
    .join(" ");
  const suffix = failure.outputTruncated ? " (output truncated)" : "";
  const bodyLimit = limit - suffix.length;
  if (output.length <= bodyLimit) return `${output}${suffix}`;
  const half = Math.floor((bodyLimit - 3) / 2);
  const head = output
    .slice(0, half)
    .replace(/\s+\S*$/u, "")
    .trimEnd();
  const tail = output
    .slice(-half)
    .replace(/^\S*\s+/u, "")
    .trimStart();
  return `${head} … ${tail}${suffix}`;
};

const packageManagerRemediation = (
  failure: LinuxPackageInstallFailure | undefined,
): string => {
  if (failure === undefined)
    return "Allow the system package-manager operation or install the planned Hopper package and Linux runtime dependencies, then rerun rea setup.";
  const status =
    failure.exitCode === null ? "no exit status" : `exit ${failure.exitCode}`;
  const excerpt = packageOutputExcerpt(failure);
  const observed =
    excerpt === "" ? "no output was captured." : `its output: ${excerpt}`;
  return `The system package-manager command failed (${failure.command}; ${status}); ${observed} Resolve the reported problem, grant the authorization the command needs, or install the planned Hopper package and Linux runtime dependencies manually, then rerun rea setup.`;
};

/** Map provider installer failures to stable setup codes and safe recovery. */
export const setupInstallFailure = (
  reason: HopperInstallFailureReason,
  packageFailure?: LinuxPackageInstallFailure,
): SetupHopperInstallFailure => {
  switch (reason) {
    case "unsupported_host":
      return {
        status: "failed",
        code: "unsupported_host",
        remediation: "Use a supported host, then rerun rea setup.",
      };
    case "integrity":
      return {
        status: "failed",
        code: "integrity_mismatch",
        remediation:
          "The Hopper download failed integrity verification. Retry setup; if it repeats, update REA before installing.",
      };
    case "authorization_or_package_manager":
      return {
        status: "failed",
        code: "authorization_or_package_manager_failed",
        remediation: packageManagerRemediation(packageFailure),
      };
    case "launcher_missing":
      return {
        status: "failed",
        code: "launcher_missing",
        remediation:
          "The package operation completed but Hopper is not runnable. Run rea doctor and repair the reported launcher issue.",
      };
    case "runtime_dependencies":
      return {
        status: "failed",
        code: "runtime_dependency_unavailable",
        remediation:
          "Hopper was installed but required shared libraries are missing. Rerun rea setup, then apply the hopper-demo-runtime remediation from rea doctor.",
      };
    case "unsupported_hopper_build":
      return {
        status: "failed",
        code: "unsupported_hopper_build",
        remediation:
          "The installed Hopper launcher does not match the build supported by this REA release. Unset HOPPER_LAUNCHER_PATH, reinstall through rea setup, or update REA.",
      };
    case "cancelled":
      return {
        status: "failed",
        code: "setup_cancelled",
        remediation:
          "Setup was cancelled before Hopper was installed. Rerun rea setup when ready.",
      };
    case "destination_exists":
      return {
        status: "failed",
        code: "destination_exists",
        remediation:
          "The Hopper installation destination already exists and was not replaced. Reuse the existing installation or move it aside, then rerun rea setup.",
      };
    case "mount":
      return {
        status: "failed",
        code: "mount_failed",
        remediation:
          "The verified Hopper disk image could not be mounted. Eject any stale Hopper image, check local disk access, then rerun rea setup.",
      };
    case "bundle":
      return {
        status: "failed",
        code: "bundle_invalid",
        remediation:
          "The mounted package did not contain the expected Hopper application bundle. Retry setup; if it repeats, update REA before installing.",
      };
    case "publisher_verification_failed":
      return {
        status: "failed",
        code: "publisher_verification_failed",
        remediation: `The mounted Hopper application is not signed by the publisher REA pins (${HOPPER_PUBLISHER.bundleIdentifier}, Apple team ${HOPPER_PUBLISHER.teamIdentifier}); nothing was copied or launched. Install Hopper yourself and set HOPPER_LAUNCHER_PATH to its launcher, then rerun rea setup.`,
      };
    case "copy":
      return {
        status: "failed",
        code: "copy_failed",
        remediation:
          "The verified Hopper application could not be copied to the installation destination. Check destination permissions and free space, then rerun rea setup.",
      };
    default:
      return {
        status: "failed",
        code: "download_failed",
        remediation:
          "REA could not download or unpack the official Hopper package. Check network and filesystem access, then retry setup.",
      };
  }
};