import type { Command } from "commander";
import { buildGatewayConnectionDetails, callGateway } from "../gateway/call.js";
import { isLoopbackHost } from "../gateway/net.js";
import {
  approveDevicePairing,
  listDevicePairing,
  summarizeDeviceTokens,
  type PairedDevice as InfraPairedDevice,
} from "../infra/device-pairing.js";
import { formatTimeAgo } from "../infra/format-time/format-relative.ts";
import { defaultRuntime } from "../runtime.js";
import { getTerminalTableWidth, renderTable } from "../terminal/table.js";
import { theme } from "../terminal/theme.js";
import { GATEWAY_CLIENT_MODES, GATEWAY_CLIENT_NAMES } from "../utils/message-channel.js";
import { withProgress } from "./progress.js";

type DevicesRpcOpts = {
  url?: string;
  token?: string;
  password?: string;
  timeout?: string;
  json?: boolean;
  latest?: boolean;
  yes?: boolean;
  pending?: boolean;
  device?: string;
  role?: string;
  scope?: string[];
};

type DeviceTokenSummary = {
  role: string;
  scopes?: string[];
  revokedAtMs?: number;
};

type PendingDevice = {
  requestId: string;
  deviceId: string;
  displayName?: string;
  role?: string;
  roles?: string[];
  scopes?: string[];
  remoteIp?: string;
  isRepair?: boolean;
  ts?: number;
};

type PairedDevice = {
  deviceId: string;
  displayName?: string;
  roles?: string[];
  scopes?: string[];
  remoteIp?: string;
  tokens?: DeviceTokenSummary[];
  createdAtMs?: number;
  approvedAtMs?: number;
};

type DevicePairingList = {
  pending?: PendingDevice[];
  paired?: PairedDevice[];
};

const FALLBACK_NOTICE = "Direct scope access failed; using local fallback.";

const devicesCallOpts = (cmd: Command, defaults?: { timeoutMs?: number }) =>
  cmd
    .option("--url <url>", "Gateway WebSocket URL (defaults to gateway.remote.url when configured)")
    .option("--token <token>", "Gateway token (if required)")
    .option("--password <password>", "Gateway password (password auth)")
    .option("--timeout <ms>", "Timeout in ms", String(defaults?.timeoutMs ?? 10_000))
    .option("--json", "Output JSON", false);

const callGatewayCli = async (method: string, opts: DevicesRpcOpts, params?: unknown) =>
  withProgress(
    {
      label: `Devices ${method}`,
      indeterminate: true,
      enabled: opts.json !== true,
    },
    async () =>
      await callGateway({
        url: opts.url,
        token: opts.token,
        password: opts.password,
        method,
        params,
        timeoutMs: Number(opts.timeout ?? 10_000),
        clientName: GATEWAY_CLIENT_NAMES.CLI,
        mode: GATEWAY_CLIENT_MODES.CLI,
      }),
  );

function normalizeErrorMessage(error: unknown): string {
  if (error instanceof Error) {
    return error.message;
  }
  return String(error);
}

function shouldUseLocalPairingFallback(opts: DevicesRpcOpts, error: unknown): boolean {
  const message = normalizeErrorMessage(error).toLowerCase();
  if (!message.includes("pairing required")) {
    return false;
  }
  if (typeof opts.url === "string" && opts.url.trim().length > 0) {
    // Explicit --url might point at a remote/tunneled gateway; never silently
    // switch to local pairing files in that case.
    return false;
  }
  const connection = buildGatewayConnectionDetails();
  if (connection.urlSource !== "local loopback") {
    return false;
  }
  try {
    return isLoopbackHost(new URL(connection.url).hostname);
  } catch {
    return false;
  }
}

function redactLocalPairedDevice(device: InfraPairedDevice): PairedDevice {
  const { tokens, ...rest } = device;
  return {
    ...(rest as unknown as PairedDevice),
    tokens: summarizeDeviceTokens(tokens) as DeviceTokenSummary[] | undefined,
  };
}

async function listPairingWithFallback(opts: DevicesRpcOpts): Promise<DevicePairingList> {
  try {
    return parseDevicePairingList(await callGatewayCli("device.pair.list", opts, {}));
  } catch (error) {
    if (!shouldUseLocalPairingFallback(opts, error)) {
      throw error;
    }
    if (opts.json !== true) {
      defaultRuntime.log(theme.warn(FALLBACK_NOTICE));
    }
    const local = await listDevicePairing();
    return {
      pending: local.pending as PendingDevice[],
      paired: local.paired.map((device) => redactLocalPairedDevice(device)),
    };
  }
}

async function approvePairingWithFallback(
  opts: DevicesRpcOpts,
  requestId: string,
): Promise<Record<string, unknown> | null> {
  try {
    return await callGatewayCli("device.pair.approve", opts, { requestId });
  } catch (error) {
    if (!shouldUseLocalPairingFallback(opts, error)) {
      throw error;
    }
    if (opts.json !== true) {
      defaultRuntime.log(theme.warn(FALLBACK_NOTICE));
    }
    const approved = await approveDevicePairing(requestId);
    if (!approved) {
      return null;
    }
    return {
      requestId,
      device: redactLocalPairedDevice(approved.device),
    };
  }
}

function parseDevicePairingList(value: unknown): DevicePairingList {
  const obj = typeof value === "object" && value !== null ? (value as Record<string, unknown>) : {};
  return {
    pending: Array.isArray(obj.pending) ? (obj.pending as PendingDevice[]) : [],
    paired: Array.isArray(obj.paired) ? (obj.paired as PairedDevice[]) : [],
  };
}

function selectLatestPendingRequest(pending: PendingDevice[] | undefined) {
  if (!pending?.length) {
    return null;
  }
  return pending.reduce((latest, current) => {
    const latestTs = typeof latest.ts === "number" ? latest.ts : 0;
    const currentTs = typeof current.ts === "number" ? current.ts : 0;
    return currentTs > latestTs ? current : latest;
  });
}

function formatTokenSummary(tokens: DeviceTokenSummary[] | undefined) {
  if (!tokens || tokens.length === 0) {
    return "none";
  }
  const parts = tokens
    .map((t) => `${t.role}${t.revokedAtMs ? " (revoked)" : ""}`)
    .toSorted((a, b) => a.localeCompare(b));
  return parts.join(", ");
}

function formatPendingRoles(request: PendingDevice): string {
  const role = typeof request.role === "string" ? request.role.trim() : "";
  if (role) {
    return role;
  }
  const roles = Array.isArray(request.roles)
    ? request.roles.map((item) => item.trim()).filter((item) => item.length > 0)
    : [];
  if (roles.length === 0) {
    return "";
  }
  return roles.join(", ");
}

function formatPendingScopes(request: PendingDevice): string {
  const scopes = Array.isArray(request.scopes)
    ? request.scopes.map((item) => item.trim()).filter((item) => item.length > 0)
    : [];
  if (scopes.length === 0) {
    return "";
  }
  return scopes.join(", ");
}

function resolveRequiredDeviceRole(
  opts: DevicesRpcOpts,
): { deviceId: string; role: string } | null {
  const deviceId = String(opts.device ?? "").trim();
  const role = String(opts.role ?? "").trim();
  if (deviceId && role) {
    return { deviceId, role };
  }
  defaultRuntime.error("--device and --role required");
  defaultRuntime.exit(1);
  return null;
}

export function registerDevicesCli(program: Command) {
  const devices = program.command("devices").description("Device pairing and auth tokens");

  devicesCallOpts(
    devices
      .command("list")
      .description("List pending and paired devices")
      .action(async (opts: DevicesRpcOpts) => {
        const list = await listPairingWithFallback(opts);
        if (opts.json) {
          defaultRuntime.writeJson(list);
          return;
        }
        if (list.pending?.length) {
          const tableWidth = getTerminalTableWidth();
          defaultRuntime.log(
            `${theme.heading("Pending")} ${theme.muted(`(${list.pending.length})`)}`,
          );
          defaultRuntime.log(
            renderTable({
              width: tableWidth,
              columns: [
                { key: "Request", header: "Request", minWidth: 10 },
                { key: "Device", header: "Device", minWidth: 16, flex: true },
                { key: "Role", header: "Role", minWidth: 8 },
                { key: "Scopes", header: "Scopes", minWidth: 14, flex: true },
                { key: "IP", header: "IP", minWidth: 12 },
                { key: "Age", header: "Age", minWidth: 8 },
                { key: "Flags", header: "Flags", minWidth: 8 },
              ],
              rows: list.pending.map((req) => ({
                Request: req.requestId,
                Device: req.displayName || req.deviceId,
                Role: formatPendingRoles(req),
                Scopes: formatPendingScopes(req),
                IP: req.remoteIp ?? "",
                Age: typeof req.ts === "number" ? formatTimeAgo(Date.now() - req.ts) : "",
                Flags: req.isRepair ? "repair" : "",
              })),
            }).trimEnd(),
          );
        }
        if (list.paired?.length) {
          const tableWidth = getTerminalTableWidth();
          defaultRuntime.log(
            `${theme.heading("Paired")} ${theme.muted(`(${list.paired.length})`)}`,
          );
          defaultRuntime.log(
            renderTable({
              width: tableWidth,
              columns: [
                { key: "Device", header: "Device", minWidth: 16, flex: true },
                { key: "Roles", header: "Roles", minWidth: 12, flex: true },
                { key: "Scopes", header: "Scopes", minWidth: 12, flex: true },
                { key: "Tokens", header: "Tokens", minWidth: 12, flex: true },
                { key: "IP", header: "IP", minWidth: 12 },
              ],
              rows: list.paired.map((device) => ({
                Device: device.displayName || device.deviceId,
                Roles: device.roles?.length ? device.roles.join(", ") : "",
                Scopes: device.scopes?.length ? device.scopes.join(", ") : "",
                Tokens: formatTokenSummary(device.tokens),
                IP: device.remoteIp ?? "",
              })),
            }).trimEnd(),
          );
        }
        if (!list.pending?.length && !list.paired?.length) {
          defaultRuntime.log(theme.muted("No device pairing entries."));
        }
      }),
  );

  devicesCallOpts(
    devices
      .command("remove")
      .description("Remove a paired device entry")
      .argument("<deviceId>", "Paired device id")
      .action(async (deviceId: string, opts: DevicesRpcOpts) => {
        const trimmed = deviceId.trim();
        if (!trimmed) {
          defaultRuntime.error("deviceId is required");
          defaultRuntime.exit(1);
          return;
        }
        const result = await callGatewayCli("device.pair.remove", opts, { deviceId: trimmed });
        if (opts.json) {
          defaultRuntime.writeJson(result);
          return;
        }
        defaultRuntime.log(`${theme.warn("Removed")} ${theme.command(trimmed)}`);
      }),
  );

  devicesCallOpts(
    devices
      .command("clear")
      .description("Clear paired devices from the gateway table")
      .option("--pending", "Also reject all pending pairing requests", false)
      .option("--yes", "Confirm destructive clear", false)
      .action(async (opts: DevicesRpcOpts) => {
        if (!opts.yes) {
          defaultRuntime.error("Refusing to clear pairing table without --yes");
          defaultRuntime.exit(1);
          return;
        }
        const list = parseDevicePairingList(await callGatewayCli("device.pair.list", opts, {}));
        const removedDeviceIds: string[] = [];
        const rejectedRequestIds: string[] = [];
        const paired = Array.isArray(list.paired) ? list.paired : [];
        for (const device of paired) {
          const deviceId = typeof device.deviceId === "string" ? device.deviceId.trim() : "";
          if (!deviceId) {
            continue;
          }
          await callGatewayCli("device.pair.remove", opts, { deviceId });
          removedDeviceIds.push(deviceId);
        }
        if (opts.pending) {
          const pending = Array.isArray(list.pending) ? list.pending : [];
          for (const req of pending) {
            const requestId = typeof req.requestId === "string" ? req.requestId.trim() : "";
            if (!requestId) {
              continue;
            }
            await callGatewayCli("device.pair.reject", opts, { requestId });
            rejectedRequestIds.push(requestId);
          }
        }
        if (opts.json) {
          defaultRuntime.writeJson({
            removedDevices: removedDeviceIds,
            rejectedPending: rejectedRequestIds,
          });
          return;
        }
        defaultRuntime.log(
          `${theme.warn("Cleared")} ${removedDeviceIds.length} paired device${removedDeviceIds.length === 1 ? "" : "s"}`,
        );
        if (opts.pending) {
          defaultRuntime.log(
            `${theme.warn("Rejected")} ${rejectedRequestIds.length} pending request${rejectedRequestIds.length === 1 ? "" : "s"}`,
          );
        }
      }),
  );

  devicesCallOpts(
    devices
      .command("approve")
      .description("Approve a pending device pairing request")
      .argument("[requestId]", "Pending request id")
      .option("--latest", "Approve the most recent pending request", false)
      .action(async (requestId: string | undefined, opts: DevicesRpcOpts) => {
        let resolvedRequestId = requestId?.trim();
        if (!resolvedRequestId || opts.latest) {
          const latest = selectLatestPendingRequest((await listPairingWithFallback(opts)).pending);
          resolvedRequestId = latest?.requestId?.trim();
        }
        if (!resolvedRequestId) {
          defaultRuntime.error("No pending device pairing requests to approve");
          defaultRuntime.exit(1);
          return;
        }
        const result = await approvePairingWithFallback(opts, resolvedRequestId);
        if (!result) {
          defaultRuntime.error("unknown requestId");
          defaultRuntime.exit(1);
          return;
        }
        if (opts.json) {
          defaultRuntime.writeJson(result);
          return;
        }
        const deviceId = (result as { device?: { deviceId?: string } })?.device?.deviceId;
        defaultRuntime.log(
          `${theme.success("Approved")} ${theme.command(deviceId ?? "ok")} ${theme.muted(`(${resolvedRequestId})`)}`,
        );
      }),
  );

  devicesCallOpts(
    devices
      .command("reject")
      .description("Reject a pending device pairing request")
      .argument("<requestId>", "Pending request id")
      .action(async (requestId: string, opts: DevicesRpcOpts) => {
        const result = await callGatewayCli("device.pair.reject", opts, { requestId });
        if (opts.json) {
          defaultRuntime.writeJson(result);
          return;
        }
        const deviceId = (result as { deviceId?: string })?.deviceId;
        defaultRuntime.log(`${theme.warn("Rejected")} ${theme.command(deviceId ?? "ok")}`);
      }),
  );

  devicesCallOpts(
    devices
      .command("rotate")
      .description("Rotate a device token for a role")
      .requiredOption("--device <id>", "Device id")
      .requiredOption("--role <role>", "Role name")
      .option("--scope <scope...>", "Scopes to attach to the token (repeatable)")
      .action(async (opts: DevicesRpcOpts) => {
        const required = resolveRequiredDeviceRole(opts);
        if (!required) {
          return;
        }
        const result = await callGatewayCli("device.token.rotate", opts, {
          deviceId: required.deviceId,
          role: required.role,
          scopes: Array.isArray(opts.scope) ? opts.scope : undefined,
        });
        defaultRuntime.writeJson(result);
      }),
  );

  devicesCallOpts(
    devices
      .command("revoke")
      .description("Revoke a device token for a role")
      .requiredOption("--device <id>", "Device id")
      .requiredOption("--role <role>", "Role name")
      .action(async (opts: DevicesRpcOpts) => {
        const required = resolveRequiredDeviceRole(opts);
        if (!required) {
          return;
        }
        const result = await callGatewayCli("device.token.revoke", opts, {
          deviceId: required.deviceId,
          role: required.role,
        });
        defaultRuntime.writeJson(result);
      }),
  );
}
