import type {
  GameClientBridgeApprovalState,
  GameClientBridgeCancelResponse,
  GameClientBridgeCommandCancellationResponse,
  GameClientBridgeCommandListResponse,
  GameClientBridgeCommandResponse,
  GameClientBridgeCommandResultResponse,
  GameClientBridgeCommandState,
  GameClientBridgeJsonObject,
  GameClientBridgeJsonValue,
  GameClientBridgeProfileDeclarationResponse,
  GameClientBridgeResultStatus,
  GameClientBridgeSnapshotListResponse,
  GameClientBridgeSnapshotResponse,
  GameClientBridgeStatusResponse
} from "../api/types";

const commandStates = new Set<GameClientBridgeCommandState>(["pending", "claimed", "succeeded", "failed", "cancelled", "expired"]);
const approvalStates = new Set<GameClientBridgeApprovalState>(["not_required", "pending", "approved", "rejected"]);
const resultStatuses = new Set<GameClientBridgeResultStatus>(["succeeded", "failed", "cancelled"]);
const forbiddenKeys = new Set([
  "apikey",
  "accesskey",
  "accesskeyid",
  "claimlease",
  "componentkey",
  "componentsession",
  "componentsessionid",
  "credential",
  "credentials",
  "deploymentgeneration",
  "dsn",
  "fencingtoken",
  "hostpath",
  "installationid",
  "keygeneration",
  "leaseexpiresat",
  "password",
  "privatekey",
  "rawcredential",
  "runendpoint",
  "runendpointurl",
  "secret",
  "secretref",
  "secretvalue",
  "sessiontoken",
  "socket",
  "sourcesessionid",
  "storagecredential",
  "token"
]);
const forbiddenFragments = [
  "bearer ",
  "password=",
  "secret://",
  "unix://",
  "tcp://",
  "mysql://",
  "postgres://",
  "sqlite://",
  "rcon://"
];
const forbiddenHostPath = /(?:^|[\s"'])(?:\/[Uu]sers\/|\/home\/|\/root\/|\/var\/|\/etc\/|\/opt\/|[a-z]:[\\/]|\\\\[^\\]+\\)/;

export function parseSafeGameClientBridgeStatus(value: unknown): GameClientBridgeStatusResponse {
  const record = safeObject(value, "Game Client Bridge status");
  return {
    serverInstanceId: string(record.serverInstanceId, "serverInstanceId"),
    pluginId: string(record.pluginId, "pluginId"),
    available: boolean(record.available, "available"),
    reason: optionalString(record.reason, "reason"),
    profiles: array(record.profiles, "profiles").map(parseProfile),
    features: array(record.features ?? [], "features").map(parseFeature)
  };
}

export function parseSafeGameClientBridgeCommand(value: unknown): GameClientBridgeCommandResponse {
  const record = safeObject(value, "Game Client Bridge command");
  const result: GameClientBridgeCommandResponse = {
    id: string(record.id, "id"),
    serverInstanceId: string(record.serverInstanceId, "serverInstanceId"),
    pluginId: string(record.pluginId, "pluginId"),
    profileKey: string(record.profileKey, "profileKey"),
    commandType: string(record.commandType, "commandType"),
    priority: number(record.priority, "priority"),
    state: commandState(record.state),
    approvalState: approvalState(record.approvalState),
    expiresAt: string(record.expiresAt, "expiresAt"),
    createdAt: string(record.createdAt, "createdAt"),
    updatedAt: string(record.updatedAt, "updatedAt")
  };
  copyOptionalString(record, result, "requesterId");
  copyOptionalString(record, result, "resultSummary");
  copyOptionalString(record, result, "completedAt");
  const auditReferences = optionalStringArray(record.auditReferences, "auditReferences");
  if (auditReferences) result.auditReferences = auditReferences;
  if (record.result !== undefined) result.result = parseResult(record.result);
  if (record.cancellation !== undefined) result.cancellation = parseCancellation(record.cancellation);
  return result;
}

export function parseSafeGameClientBridgeCommandList(value: unknown): GameClientBridgeCommandListResponse {
  const record = safeObject(value, "Game Client Bridge command list");
  return {
    items: array(record.items, "items").map(parseSafeGameClientBridgeCommand),
    count: nonNegativeInteger(record.count, "count")
  };
}

export function parseSafeGameClientBridgeCancellation(value: unknown): GameClientBridgeCancelResponse {
  const record = safeObject(value, "Game Client Bridge cancellation");
  const result: GameClientBridgeCancelResponse = {
    commandId: string(record.commandId, "commandId"),
    state: commandState(record.state),
    cancellation: parseCancellation(record.cancellation),
    updatedAt: string(record.updatedAt, "updatedAt")
  };
  const auditReferences = optionalStringArray(record.auditReferences, "auditReferences");
  if (auditReferences) result.auditReferences = auditReferences;
  return result;
}

export function parseSafeGameClientBridgeSnapshotList(value: unknown): GameClientBridgeSnapshotListResponse {
  const record = safeObject(value, "Game Client Bridge snapshot list");
  return {
    items: array(record.items, "items").map(parseSnapshot),
    count: nonNegativeInteger(record.count, "count")
  };
}

function parseProfile(value: unknown): GameClientBridgeProfileDeclarationResponse {
  const record = safeObject(value, "Game Client Bridge profile");
  return {
    pluginId: string(record.pluginId, "profile.pluginId"),
    profileKey: string(record.profileKey, "profile.profileKey"),
    available: boolean(record.available, "profile.available"),
    reason: optionalString(record.reason, "profile.reason"),
    commandTypes: stringArray(record.commandTypes, "profile.commandTypes"),
    snapshotTypes: stringArray(record.snapshotTypes, "profile.snapshotTypes"),
    queryTemplateKeys: stringArray(record.queryTemplateKeys, "profile.queryTemplateKeys"),
    handlerTypes: stringArray(record.handlerTypes ?? [], "profile.handlerTypes"),
    eventProducerTypes: stringArray(record.eventProducerTypes ?? [], "profile.eventProducerTypes")
  };
}

function parseFeature(value: unknown): { key: string; available: boolean; reason?: string } {
  const record = safeObject(value, "Game Client Bridge feature");
  return { key: string(record.key, "feature.key"), available: boolean(record.available, "feature.available"), reason: optionalString(record.reason, "feature.reason") };
}

function parseResult(value: unknown): GameClientBridgeCommandResultResponse {
  const record = safeObject(value, "Game Client Bridge command result");
  const result: GameClientBridgeCommandResultResponse = {
    status: resultStatus(record.status),
    completedAt: string(record.completedAt, "result.completedAt")
  };
  const summary = optionalString(record.summary, "result.summary");
  if (summary) result.summary = summary;
  if (record.payload !== undefined) result.payload = jsonObject(record.payload, "result.payload");
  return result;
}

function parseCancellation(value: unknown): GameClientBridgeCommandCancellationResponse {
  const record = safeObject(value, "Game Client Bridge command cancellation");
  const result: GameClientBridgeCommandCancellationResponse = {
    cancelledAt: string(record.cancelledAt, "cancellation.cancelledAt")
  };
  const requestedBy = optionalString(record.requestedBy, "cancellation.requestedBy");
  const reason = optionalString(record.reason, "cancellation.reason");
  if (requestedBy) result.requestedBy = requestedBy;
  if (reason) result.reason = reason;
  return result;
}

function parseSnapshot(value: unknown): GameClientBridgeSnapshotResponse {
  const record = safeObject(value, "Game Client Bridge snapshot");
  const retention = safeObject(record.retention, "snapshot.retention");
  const result: GameClientBridgeSnapshotResponse = {
    id: string(record.id, "snapshot.id"),
    serverInstanceId: string(record.serverInstanceId, "snapshot.serverInstanceId"),
    pluginId: string(record.pluginId, "snapshot.pluginId"),
    profileKey: string(record.profileKey, "snapshot.profileKey"),
    type: string(record.type, "snapshot.type"),
    schemaVersion: string(record.schemaVersion, "snapshot.schemaVersion"),
    streamKey: string(record.streamKey, "snapshot.streamKey"),
    sequence: nonNegativeInteger(record.sequence, "snapshot.sequence"),
    observedAt: string(record.observedAt, "snapshot.observedAt"),
    payload: jsonObject(record.payload, "snapshot.payload"),
    retention: {
      keepForSeconds: nonNegativeInteger(retention.keepForSeconds, "snapshot.retention.keepForSeconds")
    },
    createdAt: string(record.createdAt, "snapshot.createdAt"),
    expiresAt: string(record.expiresAt, "snapshot.expiresAt")
  };
  if (retention.maxRecords !== undefined) result.retention.maxRecords = nonNegativeInteger(retention.maxRecords, "snapshot.retention.maxRecords");
  const auditReferences = optionalStringArray(record.auditReferences, "snapshot.auditReferences");
  if (auditReferences) result.auditReferences = auditReferences;
  return result;
}

function safeObject(value: unknown, label: string): Record<string, unknown> {
  const record = object(value, label);
  rejectSensitiveProjection(record);
  return record;
}

function rejectSensitiveProjection(value: unknown): void {
  if (typeof value === "string") {
    const normalized = value.toLowerCase();
    if (forbiddenFragments.some((fragment) => normalized.includes(fragment)) || forbiddenHostPath.test(value)) {
      throw new Error("Game Client Bridge response contains sensitive connection or host data");
    }
    return;
  }
  if (Array.isArray(value)) {
    value.forEach(rejectSensitiveProjection);
    return;
  }
  if (value && typeof value === "object") {
    for (const [key, child] of Object.entries(value)) {
      if (forbiddenKeys.has(key.toLowerCase().replace(/[^a-z0-9]/g, ""))) {
        throw new Error("Game Client Bridge response contains a forbidden field");
      }
      rejectSensitiveProjection(child);
    }
  }
}

function jsonObject(value: unknown, label: string): GameClientBridgeJsonObject {
  const record = object(value, label);
  return Object.fromEntries(Object.entries(record).map(([key, child]) => [key, jsonValue(child, `${label}.${key}`)]));
}

function jsonValue(value: unknown, label: string): GameClientBridgeJsonValue {
  if (value === null || typeof value === "string" || typeof value === "boolean") return value;
  if (typeof value === "number" && Number.isFinite(value)) return value;
  if (Array.isArray(value)) return value.map((child, index) => jsonValue(child, `${label}[${index}]`));
  if (value && typeof value === "object") return jsonObject(value, label);
  throw new Error(`${label} must be JSON-compatible`);
}

function object(value: unknown, label: string): Record<string, unknown> {
  if (!value || typeof value !== "object" || Array.isArray(value)) throw new Error(`${label} must be an object`);
  return value as Record<string, unknown>;
}

function array(value: unknown, label: string): unknown[] {
  if (!Array.isArray(value)) throw new Error(`${label} must be an array`);
  return value;
}

function string(value: unknown, label: string): string {
  if (typeof value !== "string" || value === "") throw new Error(`${label} must be a string`);
  return value;
}

function optionalString(value: unknown, label: string): string | undefined {
  if (value === undefined || value === "") return undefined;
  return string(value, label);
}

function number(value: unknown, label: string): number {
  if (typeof value !== "number" || !Number.isFinite(value)) throw new Error(`${label} must be a number`);
  return value;
}

function nonNegativeInteger(value: unknown, label: string): number {
  const parsed = number(value, label);
  if (!Number.isSafeInteger(parsed) || parsed < 0) throw new Error(`${label} must be a non-negative safe integer`);
  return parsed;
}

function boolean(value: unknown, label: string): boolean {
  if (typeof value !== "boolean") throw new Error(`${label} must be a boolean`);
  return value;
}

function stringArray(value: unknown, label: string): string[] {
  return array(value, label).map((item, index) => string(item, `${label}[${index}]`));
}

function optionalStringArray(value: unknown, label: string): string[] | undefined {
  if (value === undefined) return undefined;
  return stringArray(value, label);
}

function commandState(value: unknown): GameClientBridgeCommandState {
  const parsed = string(value, "state") as GameClientBridgeCommandState;
  if (!commandStates.has(parsed)) throw new Error("Game Client Bridge command state is invalid");
  return parsed;
}

function approvalState(value: unknown): GameClientBridgeApprovalState {
  const parsed = string(value, "approvalState") as GameClientBridgeApprovalState;
  if (!approvalStates.has(parsed)) throw new Error("Game Client Bridge approval state is invalid");
  return parsed;
}

function resultStatus(value: unknown): GameClientBridgeResultStatus {
  const parsed = string(value, "result.status") as GameClientBridgeResultStatus;
  if (!resultStatuses.has(parsed)) throw new Error("Game Client Bridge result status is invalid");
  return parsed;
}

function copyOptionalString<T extends object>(source: Record<string, unknown>, target: T, key: keyof T): void {
  const parsed = optionalString(source[key as string], String(key));
  if (parsed) (target as Record<keyof T, unknown>)[key] = parsed;
}