import { createHash, randomUUID } from "node:crypto";
import type { BackendProfile, CreateCommandInput, CreateQueueTaskInput, CreateRunInput, ExecutionPolicy, JsonRecord, JsonValue, QueueTaskState, ResourceBundleRef, SecretRef, SessionListState, SessionRef, WorkspaceRef } from "./types.js";
import { AgentRunError } from "./errors.js";
import { backendProfileIdPattern, backendProfileSpec, isBackendProfile } from "./backend-profiles.js";
import { validateAipodImageRef } from "./aipod-image-ref-validation.js";

const backendProfilePatternText = String(backendProfileIdPattern);

const allowedTenants = new Set(["unidesk", "hwlab"]);
const allowedToolCredentials = ["github", "unidesk-ssh"] as const;

export function nowIso(): string {
  return new Date().toISOString();
}

export function newId(prefix: string): string {
  return `${prefix}_${randomUUID().replace(/-/gu, "")}`;
}

export function stableHash(value: JsonValue): string {
  return createHash("sha256").update(JSON.stringify(sortJson(value))).digest("hex");
}

function sortJson(value: JsonValue): JsonValue {
  if (Array.isArray(value)) return value.map(sortJson);
  if (typeof value !== "object" || value === null) return value;
  return Object.fromEntries(Object.entries(value).sort(([a], [b]) => a.localeCompare(b)).map(([key, entry]) => [key, sortJson(entry)]));
}

export function asRecord(value: unknown, fieldName: string): JsonRecord {
  if (typeof value === "object" && value !== null && !Array.isArray(value)) return value as JsonRecord;
  throw new AgentRunError("schema-invalid", `${fieldName} must be an object`, { httpStatus: 400 });
}

function requiredString(record: JsonRecord, key: string): string {
  const value = record[key];
  if (typeof value !== "string" || value.trim().length === 0) throw new AgentRunError("schema-invalid", `${key} is required`, { httpStatus: 400 });
  return value.trim();
}

function requiredRecord(record: JsonRecord, key: string): JsonRecord {
  return asRecord(record[key], key);
}

export function validateCreateRun(input: unknown): CreateRunInput {
  const record = asRecord(input, "run");
  const tenantId = requiredString(record, "tenantId");
  if (!allowedTenants.has(tenantId)) throw new AgentRunError("tenant-policy-denied", `tenantId ${tenantId} is not allowed`, { httpStatus: 403 });
  const backendProfileValue = requiredString(record, "backendProfile");
  if (!isBackendProfile(backendProfileValue)) throw new AgentRunError("schema-invalid", `backendProfile ${backendProfileValue} must be a lowercase slug`, { httpStatus: 400, details: { pattern: backendProfilePatternText } });
  const backendProfile = backendProfileValue as BackendProfile;
  const executionPolicy = validateExecutionPolicy(requiredRecord(record, "executionPolicy"));
  validateBackendSecretScope(backendProfile, executionPolicy);
  const workspaceRef = validateWorkspaceRef(requiredRecord(record, "workspaceRef"));
  const resourceBundleRef = validateResourceBundleRef(record.resourceBundleRef);
  const normalizedWorkspaceRef = validatePrimaryWorkspaceContract(workspaceRef, resourceBundleRef);
  return {
    tenantId,
    projectId: requiredString(record, "projectId"),
    workspaceRef: normalizedWorkspaceRef,
    sessionRef: validateSessionRef(record.sessionRef),
    resourceBundleRef,
    providerId: requiredString(record, "providerId"),
    backendProfile,
    executionPolicy,
    traceSink: record.traceSink ?? null,
  };
}

export function validateSessionRef(value: unknown): SessionRef | null {
  if (value === undefined || value === null) return null;
  const record = asRecord(value, "sessionRef");
  const sessionId = requiredString(record, "sessionId");
  const result: SessionRef = { sessionId };
  const conversationId = optionalString(record.conversationId);
  const threadId = optionalString(record.threadId);
  const expiresAt = optionalString(record.expiresAt);
  const metadata = record.metadata === undefined ? undefined : asRecord(record.metadata, "sessionRef.metadata");
  if (conversationId) result.conversationId = conversationId;
  if (threadId) result.threadId = threadId;
  if (expiresAt) result.expiresAt = expiresAt;
  if (metadata) result.metadata = metadata;
  return result;
}

export function validateResourceBundleRef(value: unknown): ResourceBundleRef | null {
  if (value === undefined || value === null) return null;
  const record = asRecord(value, "resourceBundleRef");
  const kind = requiredString(record, "kind");
  if (kind !== "gitbundle") throw new AgentRunError("schema-invalid", "resourceBundleRef.kind must be gitbundle", { httpStatus: 400 });
  const repoUrl = requiredString(record, "repoUrl");
  const commitId = optionalString(record.commitId);
  if (commitId) validateCommitId(commitId, "resourceBundleRef.commitId");
  const ref = validateGitRef(record.ref, "resourceBundleRef.ref");
  if (!commitId && !ref) throw new AgentRunError("schema-invalid", "resourceBundleRef must declare ref or a full commitId", { httpStatus: 400 });
  rejectLegacyResourceBundleFields(record);
  const result: ResourceBundleRef = { kind: "gitbundle", repoUrl, ...(commitId ? { commitId } : {}), ...(ref ? { ref } : {}), bundles: validateResourceGitBundles(record.bundles, repoUrl, commitId, ref) };
  if (record.promptRefs !== undefined) result.promptRefs = validateResourcePromptRefs(record.promptRefs);
  if (record.requiredSkills !== undefined) result.requiredSkills = validateResourceRequiredSkills(record.requiredSkills);
  if (record.submodules !== undefined && record.submodules !== false) throw new AgentRunError("schema-invalid", "resourceBundleRef.submodules can only be false in v0.1", { httpStatus: 400 });
  if (record.lfs !== undefined && record.lfs !== false) throw new AgentRunError("schema-invalid", "resourceBundleRef.lfs can only be false in v0.1", { httpStatus: 400 });
  if (record.submodules === false) result.submodules = false;
  if (record.lfs === false) result.lfs = false;
  if (record.credentialRef !== undefined) result.credentialRef = validateSecretRef(asRecord(record.credentialRef, "resourceBundleRef.credentialRef"));
  return result;
}

function rejectLegacyResourceBundleFields(record: JsonRecord): void {
  for (const field of ["toolAliases", "skillRefs", "workspaceFiles", "subdir", "sparsePaths", "gitMirror"] as const) {
    if (record[field] !== undefined) throw new AgentRunError("schema-invalid", `resourceBundleRef.${field} is removed; use resourceBundleRef.bundles[] with kind=gitbundle`, { httpStatus: 400 });
  }
}

function validateResourceGitBundles(value: unknown, defaultRepoUrl: string, defaultCommitId?: string, defaultRef?: string): ResourceBundleRef["bundles"] {
  if (!Array.isArray(value)) throw new AgentRunError("schema-invalid", "resourceBundleRef.bundles must be an array", { httpStatus: 400 });
  if (value.length === 0) throw new AgentRunError("schema-invalid", "resourceBundleRef.bundles must contain at least one entry", { httpStatus: 400 });
  if (value.length > 64) throw new AgentRunError("schema-invalid", "resourceBundleRef.bundles must contain at most 64 entries", { httpStatus: 400 });
  const seen = new Set<string>();
  const seenTargets = new Set<string>();
  return value.map((entry, index) => {
    const record = asRecord(entry, `resourceBundleRef.bundles[${index}]`);
    const name = optionalString(record.name);
    if (name) validateResourceName(name, `resourceBundleRef.bundles[${index}].name`);
    const repoUrl = optionalString(record.repoUrl) ?? defaultRepoUrl;
    const explicitCommitId = optionalString(record.commitId);
    const explicitRef = validateGitRef(record.ref, `resourceBundleRef.bundles[${index}].ref`);
    if (repoUrl !== defaultRepoUrl && !explicitCommitId && !explicitRef) {
      throw new AgentRunError("schema-invalid", `resourceBundleRef.bundles[${index}] uses a different repoUrl and must declare its own ref or commitId`, { httpStatus: 400 });
    }
    const commitId = explicitCommitId ?? (repoUrl === defaultRepoUrl ? defaultCommitId : undefined);
    if (commitId) validateCommitId(commitId, `resourceBundleRef.bundles[${index}].commitId`);
    const ref = explicitRef ?? (repoUrl === defaultRepoUrl ? defaultRef : undefined);
    const subpath = validateBundleSubpath(requiredString(record, "subpath"), `resourceBundleRef.bundles[${index}].subpath`);
    const rawTargetPath = typeof record.targetPath === "string" ? record.targetPath : record.target_path;
    if (typeof rawTargetPath !== "string" || rawTargetPath.trim().length === 0) throw new AgentRunError("schema-invalid", `resourceBundleRef.bundles[${index}].target_path is required`, { httpStatus: 400 });
    const targetPath = validateWorkspaceRelativePath(rawTargetPath.trim(), `resourceBundleRef.bundles[${index}].target_path`);
    if (targetPath === ".git" || targetPath.startsWith(".git/")) throw new AgentRunError("schema-invalid", `resourceBundleRef.bundles[${index}].target_path cannot replace primary workspace Git metadata`, { httpStatus: 400 });
    if (seenTargets.has(targetPath)) throw new AgentRunError("schema-invalid", `resourceBundleRef.bundles[${index}].target_path conflicts with an earlier bundle target`, { httpStatus: 400 });
    seenTargets.add(targetPath);
    const identity = `${repoUrl}\0${commitId ?? ""}\0${ref ?? ""}\0${subpath}\0${targetPath}`;
    if (seen.has(identity)) throw new AgentRunError("schema-invalid", `resourceBundleRef.bundles[${index}] duplicates an earlier bundle target`, { httpStatus: 400 });
    seen.add(identity);
    return { ...(name ? { name } : {}), ...(repoUrl === defaultRepoUrl ? {} : { repoUrl }), ...(commitId && (repoUrl !== defaultRepoUrl || commitId !== defaultCommitId) ? { commitId } : {}), ...(ref && (repoUrl !== defaultRepoUrl || ref !== defaultRef) ? { ref } : {}), subpath, targetPath };
  });
}

export function validateWorkspaceRef(record: JsonRecord): WorkspaceRef {
  const kind = requiredString(record, "kind");
  if (!["git-worktree", "host-path", "kubernetes-pvc", "opaque"].includes(kind)) {
    throw new AgentRunError("schema-invalid", `workspaceRef.kind ${kind} is not supported`, { httpStatus: 400 });
  }
  return record as WorkspaceRef;
}

export function validatePrimaryWorkspaceContract(workspaceRef: WorkspaceRef | null, resourceBundleRef: ResourceBundleRef | null): WorkspaceRef {
  if (!resourceBundleRef) {
    if (!workspaceRef) throw new AgentRunError("schema-invalid", "workspaceRef is required", { httpStatus: 400 });
    return workspaceRef;
  }
  const normalized: WorkspaceRef = { kind: "opaque", path: "." };
  const received = workspaceRef ?? ({} as WorkspaceRef);
  const ignoredKeys = Object.keys(received).filter((key) => key !== "kind" && key !== "path").sort();
  if (received.kind !== normalized.kind || received.path !== normalized.path || ignoredKeys.length > 0) {
    console.warn(JSON.stringify({
      event: "agentrun.contract.warning",
      code: "gitbundle-workspace-ref-normalized",
      receivedKind: typeof received.kind === "string" ? received.kind : null,
      receivedPath: typeof received.path === "string" ? received.path : null,
      ignoredKeys,
      action: "continue-with-canonical-workspace-ref",
      blocking: false,
      valuesPrinted: false,
    }));
  }
  return normalized;
}

function validateCommitId(commitId: string, fieldName: string): void {
  if (!/^[0-9a-f]{40}$/u.test(commitId)) throw new AgentRunError("schema-invalid", `${fieldName} must be a full 40-character git commit sha`, { httpStatus: 400 });
}

function validateGitRef(value: unknown, fieldName: string): string | undefined {
  const ref = optionalString(value);
  if (!ref) return undefined;
  if (ref.length > 200 || ref.startsWith("-") || ref.includes("..") || ref.includes("@{") || ref.endsWith("/") || ref.endsWith(".") || /[\s~^:?*[\\\x00-\x1f\x7f]/u.test(ref)) {
    throw new AgentRunError("schema-invalid", `${fieldName} must be a bounded git ref name`, { httpStatus: 400 });
  }
  return ref;
}

function validateResourcePromptRefs(value: unknown): NonNullable<ResourceBundleRef["promptRefs"]> {
  if (!Array.isArray(value)) throw new AgentRunError("schema-invalid", "resourceBundleRef.promptRefs must be an array", { httpStatus: 400 });
  if (value.length > 16) throw new AgentRunError("schema-invalid", "resourceBundleRef.promptRefs must contain at most 16 entries", { httpStatus: 400 });
  const seen = new Set<string>();
  return value.map((entry, index) => {
    const record = asRecord(entry, `resourceBundleRef.promptRefs[${index}]`);
    const name = validateResourceName(requiredString(record, "name"), `resourceBundleRef.promptRefs[${index}].name`);
    if (seen.has(name)) throw new AgentRunError("schema-invalid", `resourceBundleRef.promptRefs name ${name} is duplicated`, { httpStatus: 400 });
    seen.add(name);
    const promptPath = validateBundleRelativePath(requiredString(record, "path"), `resourceBundleRef.promptRefs[${index}].path`);
    const inject = optionalString(record.inject) ?? "thread-start";
    if (inject !== "thread-start") throw new AgentRunError("schema-invalid", `resourceBundleRef.promptRefs[${index}].inject must be thread-start in v0.1`, { httpStatus: 400 });
    const required = record.required === undefined ? false : record.required;
    if (typeof required !== "boolean") throw new AgentRunError("schema-invalid", `resourceBundleRef.promptRefs[${index}].required must be boolean`, { httpStatus: 400 });
    return { name, path: promptPath, inject: "thread-start" as const, required };
  });
}

function validateResourceRequiredSkills(value: unknown): NonNullable<ResourceBundleRef["requiredSkills"]> {
  if (!Array.isArray(value)) throw new AgentRunError("schema-invalid", "resourceBundleRef.requiredSkills must be an array", { httpStatus: 400 });
  if (value.length > 32) throw new AgentRunError("schema-invalid", "resourceBundleRef.requiredSkills must contain at most 32 entries", { httpStatus: 400 });
  const seen = new Set<string>();
  return value.map((entry, index) => {
    const record = asRecord(entry, `resourceBundleRef.requiredSkills[${index}]`);
    const allowedKeys = new Set(["name"]);
    const extraKeys = Object.keys(record).filter((key) => !allowedKeys.has(key));
    if (extraKeys.length > 0) throw new AgentRunError("schema-invalid", `resourceBundleRef.requiredSkills[${index}] only supports name`, { httpStatus: 400, details: { rejectedKeys: extraKeys.sort(), valuesPrinted: false } });
    const name = validateResourceName(requiredString(record, "name"), `resourceBundleRef.requiredSkills[${index}].name`);
    if (seen.has(name)) throw new AgentRunError("schema-invalid", `resourceBundleRef.requiredSkills name ${name} is duplicated`, { httpStatus: 400 });
    seen.add(name);
    return { name };
  });
}

function validateResourceName(name: string, fieldName: string): string {
  if (!/^[a-z][a-z0-9._-]{0,62}$/u.test(name)) throw new AgentRunError("schema-invalid", `${fieldName} must be a lowercase resource name`, { httpStatus: 400 });
  return name;
}

function validateBundleSubpath(relativePath: string, fieldName: string): string {
  if (relativePath.startsWith("/") || relativePath.includes("..") || relativePath.includes("\\")) throw new AgentRunError("schema-invalid", `${fieldName} must stay within the checkout`, { httpStatus: 400 });
  return relativePath;
}

function validateBundleRelativePath(relativePath: string, fieldName: string): string {
  if (relativePath === "." || relativePath.startsWith("/") || relativePath.includes("..") || relativePath.includes("\\")) throw new AgentRunError("schema-invalid", `${fieldName} must stay within the checkout`, { httpStatus: 400 });
  return relativePath;
}

function validateWorkspaceRelativePath(relativePath: string, fieldName: string): string {
  if (relativePath === "." || relativePath.startsWith("/") || relativePath.includes("..") || relativePath.includes("\\")) throw new AgentRunError("schema-invalid", `${fieldName} must stay within the workspace`, { httpStatus: 400 });
  return relativePath;
}

export function validateExecutionPolicy(record: JsonRecord): ExecutionPolicy {
  const timeout = record.timeoutMs;
  if (typeof timeout !== "number" || !Number.isFinite(timeout) || timeout <= 0) throw new AgentRunError("schema-invalid", "executionPolicy.timeoutMs must be a positive number", { httpStatus: 400 });
  const secretScope = asRecord(record.secretScope ?? {}, "executionPolicy.secretScope");
  if (secretScope.allowCredentialEcho !== undefined && secretScope.allowCredentialEcho !== false) throw new AgentRunError("tenant-policy-denied", "allowCredentialEcho must be false", { httpStatus: 403 });
  const rawProviderCredentials = Array.isArray(secretScope.providerCredentials) ? secretScope.providerCredentials : [];
  const providerCredentials: NonNullable<ExecutionPolicy["secretScope"]["providerCredentials"]> = [];
  for (const credential of rawProviderCredentials) {
    const item = asRecord(credential, "providerCredential");
    const profile = typeof item.profile === "string" ? item.profile.trim() : "";
    if (profile.length === 0) throw new AgentRunError("schema-invalid", "provider credential profile is required", { httpStatus: 400 });
    if (!isBackendProfile(profile)) throw new AgentRunError("schema-invalid", `provider credential profile ${profile} must be a lowercase slug`, { httpStatus: 400, details: { pattern: backendProfilePatternText } });
    const secretRef = validateSecretRef(asRecord(item.secretRef, "providerCredential.secretRef"));
    const keys = [...new Set([...(secretRef.keys ?? []), ...(backendProfileSpec(profile)?.requiredSecretKeys ?? [])])];
    providerCredentials.push({ profile, secretRef: { ...secretRef, ...(keys.length > 0 ? { keys } : {}) } });
  }
  const toolCredentials = validateToolCredentials(secretScope.toolCredentials);
  const secretScopeResult: ExecutionPolicy["secretScope"] = { allowCredentialEcho: false };
  if (providerCredentials.length > 0) secretScopeResult.providerCredentials = providerCredentials as NonNullable<ExecutionPolicy["secretScope"]["providerCredentials"]>;
  if (toolCredentials.length > 0) secretScopeResult.toolCredentials = toolCredentials;
  const gitIdentity = record.gitIdentity === undefined ? undefined : validateGitIdentity(record.gitIdentity);
  return {
    sandbox: requiredString(record, "sandbox"),
    approval: requiredString(record, "approval"),
    timeoutMs: timeout,
    network: requiredString(record, "network"),
    ...(gitIdentity ? { gitIdentity } : {}),
    secretScope: secretScopeResult,
  };
}

function validateGitIdentity(value: unknown): NonNullable<ExecutionPolicy["gitIdentity"]> {
  const record = asRecord(value, "executionPolicy.gitIdentity");
  const name = requiredString(record, "name");
  const email = requiredString(record, "email");
  if (/[\r\n]/u.test(name)) {
    throw new AgentRunError("schema-invalid", "executionPolicy.gitIdentity.name must be a single line", { httpStatus: 400 });
  }
  if (/[\r\n<>]/u.test(email) || !/^[^\s@]+@[^\s@]+$/u.test(email)) {
    throw new AgentRunError("schema-invalid", "executionPolicy.gitIdentity.email must be a valid single-line email address", { httpStatus: 400 });
  }
  return { name, email };
}

function validateToolCredentials(value: unknown): NonNullable<ExecutionPolicy["secretScope"]["toolCredentials"]> {
  if (value === undefined) return [];
  if (!Array.isArray(value)) throw new AgentRunError("schema-invalid", "toolCredentials must be an array", { httpStatus: 400 });
  if (value.length > 8) throw new AgentRunError("schema-invalid", "toolCredentials must contain at most 8 entries", { httpStatus: 400 });
  const seen = new Set<string>();
  const result = value.map((credential, index) => {
    const item = asRecord(credential, `toolCredentials[${index}]`);
    const tool = requiredString(item, "tool");
    if (!allowedToolCredentials.includes(tool as (typeof allowedToolCredentials)[number])) throw new AgentRunError("schema-invalid", `tool credential ${tool} is not supported in v0.1`, { httpStatus: 400, details: { allowedTools: [...allowedToolCredentials] } });
    const purpose = optionalString(item.purpose);
    const secretRef = validateSecretRef(asRecord(item.secretRef, `toolCredentials[${index}].secretRef`));
    const keys = secretRef.keys ?? [];
    if (keys.length === 0) throw new AgentRunError("schema-invalid", `tool credential ${tool} secretRef.keys must not be empty`, { httpStatus: 400 });
    const projection = asRecord(item.projection, `toolCredentials[${index}].projection`);
    const kind = requiredString(projection, "kind");
    const normalizedProjection = validateToolCredentialProjection(tool, projection, keys, index);
    if (tool === "github" && purpose === "github-ssh") validateGithubSshProjection(normalizedProjection, keys, index);
    const identity = `${tool}:${purpose ?? ""}:${kind}:${normalizedProjection.kind === "env" ? normalizedProjection.envName : normalizedProjection.mountPath}`;
    if (seen.has(identity)) throw new AgentRunError("schema-invalid", `tool credential projection ${identity} is duplicated`, { httpStatus: 400 });
    seen.add(identity);
    return { tool, ...(purpose ? { purpose } : {}), secretRef, projection: normalizedProjection };
  });
  if (result.filter((item) => item.tool === "github" && item.purpose === "github-ssh").length > 1) {
    throw new AgentRunError("schema-invalid", "toolCredentials must contain at most one github-ssh credential authority", { httpStatus: 400 });
  }
  return result;
}

function validateToolCredentialProjection(tool: string, projection: JsonRecord, keys: string[], index: number): NonNullable<ExecutionPolicy["secretScope"]["toolCredentials"]>[number]["projection"] {
  const kind = requiredString(projection, "kind");
  if (kind === "env") {
    const envName = requiredString(projection, "envName");
    validateEnvName(envName, `toolCredentials[${index}].projection.envName`);
    const secretKey = optionalString(projection.secretKey) ?? keys[0];
    if (!secretKey || !keys.includes(secretKey)) throw new AgentRunError("schema-invalid", `tool credential ${tool} projection.secretKey must be included in secretRef.keys`, { httpStatus: 400 });
    if (tool === "unidesk-ssh") validateUnideskSshProjection(envName, secretKey, keys, index);
    return { kind: "env", envName, secretKey };
  }

  if (kind === "volume") {
    const mountPath = requiredString(projection, "mountPath");
    if (!mountPath.startsWith("/home/agentrun/") || mountPath.includes("..")) {
      throw new AgentRunError("schema-invalid", `toolCredentials[${index}].projection.mountPath must stay under /home/agentrun`, { httpStatus: 400 });
    }
    if (tool === "unidesk-ssh") throw new AgentRunError("schema-invalid", `toolCredentials[${index}] unidesk-ssh must use env projection`, { httpStatus: 400 });
    return { kind: "volume", mountPath };
  }

  throw new AgentRunError("schema-invalid", "toolCredentials[].projection.kind must be env or volume in v0.1", { httpStatus: 400 });
}

function validateUnideskSshProjection(envName: string, secretKey: string, keys: string[], index: number): void {
  if (!keys.includes("UNIDESK_SSH_CLIENT_TOKEN")) {
    throw new AgentRunError("schema-invalid", `toolCredentials[${index}] unidesk-ssh secretRef.keys must include UNIDESK_SSH_CLIENT_TOKEN`, { httpStatus: 400 });
  }
  if (envName !== "UNIDESK_SSH_CLIENT_TOKEN" || secretKey !== "UNIDESK_SSH_CLIENT_TOKEN") {
    throw new AgentRunError("schema-invalid", `toolCredentials[${index}] unidesk-ssh must project UNIDESK_SSH_CLIENT_TOKEN from the same Secret key`, { httpStatus: 400 });
  }
}

function validateGithubSshProjection(projection: NonNullable<ExecutionPolicy["secretScope"]["toolCredentials"]>[number]["projection"], keys: string[], index: number): void {
  if (projection.kind !== "volume") {
    throw new AgentRunError("schema-invalid", `toolCredentials[${index}] github-ssh must use a volume projection`, { httpStatus: 400 });
  }
  const missingKeys = ["id_ed25519", "known_hosts"].filter((key) => !keys.includes(key));
  if (missingKeys.length > 0) {
    throw new AgentRunError("schema-invalid", `toolCredentials[${index}] github-ssh secretRef.keys must include id_ed25519 and known_hosts`, {
      httpStatus: 400,
      details: { missingKeys, valuesPrinted: false },
    });
  }
}

export function validateEnvName(name: string, fieldName: string): void {
  if (!/^[A-Z_][A-Z0-9_]{0,63}$/u.test(name)) throw new AgentRunError("schema-invalid", `${fieldName} must be an uppercase env name`, { httpStatus: 400 });
}

function validateSecretRef(record: JsonRecord): SecretRef {
  const name = requiredString(record, "name");
  const result: SecretRef = { name };
  const namespace = optionalString(record.namespace);
  const mountPath = optionalString(record.mountPath);
  if (namespace) result.namespace = namespace;
  if (mountPath) result.mountPath = mountPath;
  if (record.keys !== undefined) {
    if (!Array.isArray(record.keys) || !record.keys.every((item) => typeof item === "string" && item.length > 0)) throw new AgentRunError("schema-invalid", "secretRef.keys must be non-empty strings", { httpStatus: 400 });
    result.keys = record.keys as string[];
  }
  return result;
}

function optionalString(value: unknown): string | undefined {
  return typeof value === "string" && value.trim().length > 0 ? value.trim() : undefined;
}

function validateBackendSecretScope(backendProfile: BackendProfile, executionPolicy: ExecutionPolicy): void {
  const credentials = executionPolicy.secretScope.providerCredentials ?? [];
  const matching = credentials.filter((item) => item.profile === backendProfile);
  if (matching.length === 0) {
    throw new AgentRunError("secret-unavailable", `backendProfile ${backendProfile} requires a matching provider credential SecretRef`, { httpStatus: 400, details: { backendProfile, requiredSecretName: backendProfileSpec(backendProfile)?.defaultSecretName ?? null } });
  }
  if (matching.length > 1) throw new AgentRunError("schema-invalid", `backendProfile ${backendProfile} has multiple matching provider credentials`, { httpStatus: 400 });
}

export function validateCreateCommand(input: unknown): CreateCommandInput {
  const record = asRecord(input, "command");
  const type = requiredString(record, "type");
  if (type !== "turn" && type !== "steer" && type !== "interrupt") throw new AgentRunError("schema-invalid", `command type ${type} is not supported`, { httpStatus: 400 });
  const payload = asRecord(record.payload ?? {}, "payload");
  if (type === "steer" && !steerPrompt(payload)) throw new AgentRunError("schema-invalid", "steer command payload requires a non-empty prompt, message, or text", { httpStatus: 400 });
  const idempotencyKey = typeof record.idempotencyKey === "string" && record.idempotencyKey.trim().length > 0 ? record.idempotencyKey.trim() : undefined;
  let dispatch: CreateCommandInput["dispatch"];
  if (record.dispatch !== undefined && record.dispatch !== null) {
    if (type !== "turn") throw new AgentRunError("schema-invalid", "dispatch is only supported for turn commands", { httpStatus: 400 });
    const dispatchRecord = asRecord(record.dispatch, "command.dispatch");
    if (requiredString(dispatchRecord, "kind") !== "kubernetes-job") throw new AgentRunError("schema-invalid", "command.dispatch.kind must be kubernetes-job", { httpStatus: 400 });
    const dispatchInput = validateDurableDispatchInput(asRecord(dispatchRecord.input ?? {}, "command.dispatch.input"));
    dispatch = { kind: "kubernetes-job", input: dispatchInput };
  }
  return { type, payload, ...(idempotencyKey ? { idempotencyKey } : {}), ...(dispatch ? { dispatch } : {}) };
}

function validateDurableDispatchInput(input: JsonRecord): JsonRecord {
  assertNoSecretNamedFields(input, "command.dispatch.input");
  const allowedKeys = new Set(["idempotencyKey", "transientEnv"]);
  const rejectedKeys = Object.keys(input).filter((key) => !allowedKeys.has(key));
  if (rejectedKeys.length > 0) throw new AgentRunError("tenant-policy-denied", "durable dispatch runtime settings are controlled by AgentRun configuration", { httpStatus: 403, details: { rejectedKeys: rejectedKeys.sort(), valuesPrinted: false } });
  const normalized: JsonRecord = {};
  if (input.idempotencyKey !== undefined) normalized.idempotencyKey = boundedDispatchString(input.idempotencyKey, "command.dispatch.input.idempotencyKey", 256);
  if (input.transientEnv !== undefined) normalized.transientEnv = validateDurableTransientEnv(input.transientEnv);
  return normalized;
}

export function validateSessionRunnerJobInput(value: unknown): JsonRecord {
  const input = asRecord(value ?? {}, "sessionSend.runnerJob");
  assertNoSecretNamedFields(input, "sessionSend.runnerJob");
  const allowedKeys = new Set([
    "managerUrl", "image", "namespace", "attemptId", "runnerId", "sourceCommit", "serviceAccountName",
    "runnerIdleTimeoutMs", "backendRetryMaxAttempts", "backendRetryInitialBackoffMs", "backendRetryMaxBackoffMs",
    "idempotencyKey", "imageRef", "transientEnv",
  ]);
  const rejectedKeys = Object.keys(input).filter((key) => !allowedKeys.has(key));
  if (rejectedKeys.length > 0) throw new AgentRunError("schema-invalid", "session runner admission contains unsupported fields", { httpStatus: 400, details: { rejectedKeys: rejectedKeys.sort(), valuesPrinted: false } });
  const normalized: JsonRecord = {};
  for (const key of ["managerUrl", "image", "namespace", "attemptId", "runnerId", "sourceCommit", "serviceAccountName", "idempotencyKey"] as const) {
    if (input[key] !== undefined) normalized[key] = credentialFreeConfigValue(boundedDispatchString(input[key], `sessionSend.runnerJob.${key}`, key === "managerUrl" || key === "image" ? 2048 : 256), `sessionSend.runnerJob.${key}`);
  }
  for (const key of ["runnerIdleTimeoutMs", "backendRetryMaxAttempts", "backendRetryInitialBackoffMs", "backendRetryMaxBackoffMs"] as const) {
    if (input[key] === undefined) continue;
    const number = Number(input[key]);
    if (!Number.isSafeInteger(number) || number < 1) throw new AgentRunError("schema-invalid", `sessionSend.runnerJob.${key} must be a positive integer`, { httpStatus: 400 });
    normalized[key] = number;
  }
  if (input.imageRef !== undefined) normalized.imageRef = validateAipodImageRef(input.imageRef, "sessionSend.runnerJob.imageRef");
  if (input.transientEnv !== undefined) normalized.transientEnv = validateDurableTransientEnv(input.transientEnv);
  return normalized;
}

function validateDurableTransientEnv(value: unknown): JsonRecord[] {
  if (!Array.isArray(value)) throw new AgentRunError("schema-invalid", "command.dispatch.input.transientEnv must be an array", { httpStatus: 400 });
  if (value.length > 64) throw new AgentRunError("schema-invalid", "command.dispatch.input.transientEnv must contain at most 64 entries", { httpStatus: 400 });
  const seen = new Set<string>();
  return value.map((raw, index) => {
    const entry = asRecord(raw, `command.dispatch.input.transientEnv[${index}]`);
    const rejectedEntryKeys = Object.keys(entry).filter((key) => !["name", "value", "sensitive"].includes(key));
    if (rejectedEntryKeys.length > 0) throw new AgentRunError("schema-invalid", `command.dispatch.input.transientEnv[${index}] contains unsupported fields`, { httpStatus: 400, details: { rejectedKeys: rejectedEntryKeys.sort(), valuesPrinted: false } });
    const name = requiredString(entry, "name");
    validateEnvName(name, `command.dispatch.input.transientEnv[${index}].name`);
    assertRunnerTransientEnvNameAllowed(name);
    if (isCredentialEnvName(name)) throw durableDispatchSecretError(index, name);
    if (seen.has(name)) throw new AgentRunError("schema-invalid", `command.dispatch.input.transientEnv name ${name} is duplicated`, { httpStatus: 400 });
    seen.add(name);
    const envValue = credentialFreeConfigValue(boundedDispatchString(entry.value, `command.dispatch.input.transientEnv[${index}].value`, 8192, true), `command.dispatch.input.transientEnv[${index}].value`);
    if (entry.sensitive !== false) throw durableDispatchSecretError(index, name);
    return { name, value: envValue, sensitive: false };
  });
}

export function assertRunnerTransientEnvNameAllowed(name: string): void {
  const normalized = name.toUpperCase();
  const reservedPrefixes = ["AGENTRUN_", "CODEX_", "GIT_", "KUBERNETES_", "NPM_CONFIG_", "OTEL_"];
  const reservedNames = new Set([
    "ALL_PROXY", "BASH_ENV", "BUN_OPTIONS", "CODEX_HOME", "ENV", "HOME", "HTTP_PROXY", "HTTPS_PROXY",
    "KUBECONFIG", "LD_LIBRARY_PATH", "LD_PRELOAD", "NODE_EXTRA_CA_CERTS", "NODE_OPTIONS", "NO_PROXY", "PATH", "PROMPT_COMMAND",
  ]);
  if (reservedNames.has(normalized) || reservedPrefixes.some((prefix) => normalized.startsWith(prefix))) {
    throw new AgentRunError("tenant-policy-denied", `transientEnv ${name} is controlled by AgentRun runtime configuration`, { httpStatus: 403, details: { name, valuesPrinted: false } });
  }
}

function assertNoSecretNamedFields(value: unknown, path: string): void {
  if (Array.isArray(value)) {
    value.forEach((entry, index) => assertNoSecretNamedFields(entry, `${path}[${index}]`));
    return;
  }
  if (typeof value !== "object" || value === null) return;
  for (const [key, entry] of Object.entries(value as JsonRecord)) {
    if (isSecretFieldName(key)) {
      throw new AgentRunError("tenant-policy-denied", "durable dispatch cannot persist credential-shaped fields; use executionPolicy SecretRef", { httpStatus: 400, details: { field: `${path}.${key}`, valuesPrinted: false } });
    }
    assertNoSecretNamedFields(entry, `${path}.${key}`);
  }
}

function isSecretFieldName(key: string): boolean {
  const normalized = key.replace(/[^a-z0-9]/giu, "").toLowerCase();
  return ["secret", "token", "password", "passwd", "apikey", "authorization", "credential", "privatekey", "accesskey", "clientsecret"].some((marker) => normalized.includes(marker)) || normalized === "auth" || normalized.endsWith("auth");
}

function isCredentialEnvName(name: string): boolean {
  const normalized = name.replace(/[^A-Z0-9]/gu, "");
  return ["SECRET", "TOKEN", "PASSWORD", "PASSWD", "APIKEY", "AUTH", "CREDENTIAL", "PRIVATEKEY", "ACCESSKEY", "CLIENTSECRET"].some((marker) => normalized.includes(marker));
}

function durableDispatchSecretError(index: number, name: string): AgentRunError {
  return new AgentRunError("tenant-policy-denied", "durable dispatch cannot persist sensitive transientEnv values; use executionPolicy.toolCredentials SecretRef", { httpStatus: 400, details: { index, name, valuesPrinted: false } });
}

function boundedDispatchString(value: unknown, fieldName: string, maxBytes: number, allowWhitespace = false): string {
  if (typeof value !== "string" || value.trim().length === 0) throw new AgentRunError("schema-invalid", `${fieldName} must be a non-empty string`, { httpStatus: 400 });
  const text = value.trim();
  if (Buffer.byteLength(text, "utf8") > maxBytes) throw new AgentRunError("schema-invalid", `${fieldName} is too large`, { httpStatus: 400 });
  if (/[\x00-\x1f\x7f]/u.test(text) || (!allowWhitespace && /\s/u.test(text))) throw new AgentRunError("schema-invalid", `${fieldName} contains unsupported whitespace or control characters`, { httpStatus: 400 });
  return text;
}

function credentialFreeConfigValue(value: string, fieldName: string): string {
  if (!value.includes("://")) return value;
  let url: URL;
  try { url = new URL(value); } catch { return value; }
  if (url.username || url.password) throw new AgentRunError("tenant-policy-denied", `${fieldName} must not include URL credentials`, { httpStatus: 400 });
  return value;
}

function steerPrompt(payload: JsonRecord): string | null {
  for (const key of ["prompt", "message", "text"]) {
    const value = payload[key];
    if (typeof value === "string" && value.trim().length > 0) return value.trim();
  }
  return null;
}

export function validateCreateQueueTask(input: unknown): CreateQueueTaskInput {
  const record = asRecord(input, "queueTask");
  const tenantId = requiredString(record, "tenantId");
  if (!allowedTenants.has(tenantId)) throw new AgentRunError("tenant-policy-denied", `tenantId ${tenantId} is not allowed`, { httpStatus: 403 });
  const backendProfileValue = optionalString(record.backendProfile) ?? "codex";
  if (!isBackendProfile(backendProfileValue)) throw new AgentRunError("schema-invalid", `backendProfile ${backendProfileValue} must be a lowercase slug`, { httpStatus: 400, details: { pattern: backendProfilePatternText } });
  const queue = optionalString(record.queue) ?? "default";
  const lane = optionalString(record.lane) ?? "default";
  const priorityValue = record.priority ?? 0;
  if (typeof priorityValue !== "number" || !Number.isFinite(priorityValue)) throw new AgentRunError("schema-invalid", "priority must be a finite number", { httpStatus: 400 });
  const referencesValue = record.references ?? [];
  if (!Array.isArray(referencesValue)) throw new AgentRunError("schema-invalid", "references must be an array", { httpStatus: 400 });
  const workspaceRef = record.workspaceRef === undefined || record.workspaceRef === null ? null : validateWorkspaceRef(requiredRecord(record, "workspaceRef"));
  const resourceBundleRef = validateResourceBundleRef(record.resourceBundleRef);
  validatePrimaryWorkspaceContract(workspaceRef, resourceBundleRef);
  const result: CreateQueueTaskInput = {
    tenantId,
    projectId: requiredString(record, "projectId"),
    queue,
    lane,
    title: requiredString(record, "title"),
    priority: priorityValue,
    backendProfile: backendProfileValue,
    providerId: optionalString(record.providerId) ?? null,
    workspaceRef,
    sessionRef: validateSessionRef(record.sessionRef),
    executionPolicy: record.executionPolicy === undefined || record.executionPolicy === null ? null : validateExecutionPolicy(requiredRecord(record, "executionPolicy")),
    resourceBundleRef,
    payload: record.payload === undefined ? {} : asRecord(record.payload, "payload"),
    references: referencesValue.map((item, index) => asRecord(item, `references[${index}]`)),
    metadata: record.metadata === undefined ? {} : asRecord(record.metadata, "metadata"),
  };
  const idempotencyKey = optionalString(record.idempotencyKey);
  if (idempotencyKey) result.idempotencyKey = idempotencyKey;
  return result;
}

export function validateQueueTaskState(value: string): QueueTaskState {
  if (value === "pending" || value === "running" || value === "completed" || value === "failed" || value === "blocked" || value === "cancelled") return value;
  throw new AgentRunError("schema-invalid", `queue task state ${value} is not supported`, { httpStatus: 400 });
}

export function validateSessionListState(value: string): SessionListState {
  if (value === "default" || value === "running" || value === "unread" || value === "terminal" || value === "idle" || value === "all") return value;
  throw new AgentRunError("schema-invalid", `session state ${value} is not supported`, { httpStatus: 400 });
}

export function validateBackendProfile(value: string): BackendProfile {
  if (isBackendProfile(value)) return value;
  throw new AgentRunError("schema-invalid", `backendProfile ${value} must be a lowercase slug`, { httpStatus: 400, details: { pattern: backendProfilePatternText } });
}