/*
 * SPEC: HWLAB-ESO-UI-20260630 ESO UI draft-2026-06-30-p1-readonly-api.
 * Responsibility: read-only, redacted admin secrets API model for Cloud Web.
 */
import { existsSync, readFileSync } from "node:fs";
import { createHash } from "node:crypto";
import path from "node:path";
import { fileURLToPath } from "node:url";

import { sendJson } from "./server-http-utils.ts";

const CONTRACT_VERSION = "hwlab-admin-secrets-v1";
const DEFAULT_CONFIG_RELATIVE_PATH = "config/hwlab-v03/secrets.yaml";
const DEFAULT_TARGET = Object.freeze({
  node: "JD01",
  lane: "v03",
  runtimeNamespace: "hwlab-v03",
  infraNamespace: "platform-infra",
  publicUrl: "https://hwlab.pikapython.com",
  source: "yaml-active-target"
});
const STATUS_PRIORITY = Object.freeze([
  "SecretLeakBlocked",
  "StoreUnavailable",
  "SyncError",
  "TargetMissing",
  "RolloutPending",
  "ValidationFailed",
  "Ready",
  "Unknown"
]);

const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");

export async function handleAdminSecretsHttp(request, response, url, options = {}) {
  try {
    const auth = await authenticateAdmin(request, options);
    if (!auth.ok) return sendJson(response, numericStatus(auth.httpStatus) ?? numericStatus(auth.status) ?? numericStatus(auth.statusCode) ?? 401, auth);

    const readModel = buildAdminSecretsReadModel({ env: options.env ?? process.env });
    if (readModel.leakBlocked) return sendJson(response, 502, readModel.payload);

    if (request.method === "GET" && url.pathname === "/v1/admin/secrets/summary") {
      return sendJson(response, 200, readModel.payload);
    }
    if (request.method === "GET" && url.pathname === "/v1/admin/secrets/external-secrets") {
      return sendJson(response, 200, externalSecretsListPayload(readModel.payload, url));
    }
    const detailMatch = url.pathname.match(/^\/v1\/admin\/secrets\/external-secrets\/([^/]+)\/([^/]+)$/u);
    if (request.method === "GET" && detailMatch) {
      const detail = externalSecretDetailPayload(readModel.payload, decodeURIComponent(detailMatch[1]), decodeURIComponent(detailMatch[2]));
      return sendJson(response, detail.httpStatus ?? 200, detail);
    }
    if (request.method === "GET" && url.pathname === "/v1/admin/secrets/events") {
      return sendJson(response, 200, eventsPayload(readModel.payload, url));
    }
    return sendJson(response, 404, secretsError("not_found", "Admin secrets route is not implemented", 404));
  } catch (error) {
    return sendJson(response, error.httpStatus ?? 500, secretsError(error.code ?? "admin_secrets_failed", error.message ?? "Admin secrets read model failed", error.httpStatus ?? 500, error.details));
  }
}

export function buildAdminSecretsReadModel({ env = process.env } = {}) {
  const { config, sourcePath, sourceRelativePath, sourceError } = readSecretPlaneConfig(env);
  const secretPlane = record(config?.secretPlane);
  const readModelConfig = record(secretPlane?.readModel);
  const target = normalizeTarget(readModelConfig?.target, env, sourceRelativePath);
  const evidence = normalizeEvidence(readModelConfig?.statusEvidence);
  const store = normalizeStore(secretPlane?.store);
  const externalSecrets = normalizeExternalSecrets(secretPlane, target, store, evidence, sourceRelativePath);
  const events = buildEvents({ target, store, externalSecrets, evidence, sourceError });
  const summaryStatus = sourceError ? "Unknown" : aggregateStatus([
    ...componentStatuses(evidence),
    ...externalSecrets.map((item) => item.status)
  ]);
  const leakBlocked = hasLeakRisk({ target, store, externalSecrets, events });
  const generatedAt = new Date().toISOString();
  const common = {
    ok: !leakBlocked,
    status: leakBlocked ? "blocked" : "ok",
    contractVersion: CONTRACT_VERSION,
    valuesPrinted: false,
    secretMaterialStored: false,
    generatedAt,
    target,
    source: {
      kind: "yaml",
      path: sourceRelativePath,
      sourceRef: `${sourceRelativePath}#secretPlane`,
      present: Boolean(sourcePath && !sourceError),
      error: sourceError ? { code: "secret_plane_config_unavailable", message: sourceError } : null
    }
  };
  if (leakBlocked) {
    return {
      leakBlocked: true,
      payload: {
        ...common,
        error: {
          code: "SecretLeakBlocked",
          message: "Admin secrets read model contained disallowed secret material indicators.",
          layer: "admin-secrets-readmodel",
          retryable: false,
          valuesPrinted: false
        }
      }
    };
  }
  return {
    leakBlocked: false,
    payload: {
      ...common,
      summary: {
        status: summaryStatus,
        priority: STATUS_PRIORITY.indexOf(summaryStatus),
        counts: {
          externalSecrets: externalSecrets.length,
          ready: externalSecrets.filter((item) => item.status === "Ready").length,
          pending: externalSecrets.filter((item) => item.status === "RolloutPending" || item.status === "Unknown").length,
          errors: externalSecrets.filter((item) => ["SecretLeakBlocked", "StoreUnavailable", "SyncError", "TargetMissing", "ValidationFailed"].includes(item.status)).length,
          events: events.length
        },
        eso: {
          controller: evidence.components.esoController,
          webhook: evidence.components.esoWebhook,
          certController: evidence.components.esoCertController
        },
        stores: [store],
        consumerRollout: consumerRolloutSummary(externalSecrets),
        latestEvidence: {
          source: evidence.source,
          issue: evidence.issue,
          command: evidence.command,
          validatedAt: evidence.validatedAt,
          fingerprint: evidence.fingerprint,
          valuesPrinted: false
        }
      },
      externalSecrets,
      events
    }
  };
}

function externalSecretsListPayload(payload, url) {
  const node = text(url.searchParams.get("node")).toUpperCase();
  const lane = text(url.searchParams.get("lane")).toLowerCase();
  const namespace = text(url.searchParams.get("namespace"));
  const items = payload.externalSecrets.filter((item) => {
    if (node && item.target.node !== node) return false;
    if (lane && item.target.lane.toLowerCase() !== lane) return false;
    if (namespace && item.namespace !== namespace) return false;
    return true;
  });
  return {
    ok: true,
    status: "ok",
    contractVersion: CONTRACT_VERSION,
    valuesPrinted: false,
    secretMaterialStored: false,
    generatedAt: payload.generatedAt,
    target: payload.target,
    items,
    count: items.length
  };
}

function externalSecretDetailPayload(payload, namespace, name) {
  const item = payload.externalSecrets.find((secret) => secret.namespace === namespace && secret.name === name);
  if (!item) return secretsError("external_secret_not_found", "ExternalSecret read model entry was not found", 404, { namespace, name });
  return {
    ok: true,
    status: "ok",
    contractVersion: CONTRACT_VERSION,
    valuesPrinted: false,
    secretMaterialStored: false,
    generatedAt: payload.generatedAt,
    target: payload.target,
    item
  };
}

function eventsPayload(payload, url) {
  const limit = positiveInteger(url.searchParams.get("limit"), 50);
  const namespace = text(url.searchParams.get("namespace"));
  const items = payload.events
    .filter((event) => !namespace || event.namespace === namespace)
    .slice(0, Math.min(limit, 200));
  return {
    ok: true,
    status: "ok",
    contractVersion: CONTRACT_VERSION,
    valuesPrinted: false,
    secretMaterialStored: false,
    generatedAt: payload.generatedAt,
    target: payload.target,
    events: items,
    count: items.length
  };
}

async function authenticateAdmin(request, options) {
  const controller = options.accessController;
  if (!controller || typeof controller.authenticate !== "function") return secretsError("access_controller_unavailable", "HWLAB access controller is not available", 503);
  const auth = await controller.authenticate(request, { required: true });
  if (!auth.ok) return auth;
  if (auth.actor?.role !== "admin") return secretsError("admin_required", "Only admin users can read admin secrets status", 403);
  return auth;
}

function readSecretPlaneConfig(env) {
  const configuredPath = text(env.HWLAB_ADMIN_SECRETS_CONFIG_PATH);
  const candidates = [
    configuredPath,
    path.join(repoRoot, DEFAULT_CONFIG_RELATIVE_PATH),
    path.join(process.cwd(), DEFAULT_CONFIG_RELATIVE_PATH),
    path.join("/workspace/hwlab", DEFAULT_CONFIG_RELATIVE_PATH)
  ].filter(Boolean);
  const sourcePath = candidates.find((candidate) => existsSync(candidate)) ?? candidates[0] ?? "";
  const sourceRelativePath = sourcePath.includes(DEFAULT_CONFIG_RELATIVE_PATH) ? DEFAULT_CONFIG_RELATIVE_PATH : sourcePath;
  if (!sourcePath || !existsSync(sourcePath)) return { config: null, sourcePath, sourceRelativePath, sourceError: `missing ${sourceRelativePath}` };
  try {
    return { config: parseAdminSecretsYaml(readFileSync(sourcePath, "utf8")), sourcePath, sourceRelativePath, sourceError: null };
  } catch (error) {
    return { config: null, sourcePath, sourceRelativePath, sourceError: `invalid yaml: ${error.message ?? String(error)}` };
  }
}

function parseAdminSecretsYaml(raw) {
  const root = {};
  const stack = [{ indent: -1, value: root, pending: false, parent: null, key: "" }];
  for (const [lineIndex, rawLine] of String(raw ?? "").split(/\r?\n/u).entries()) {
    if (!rawLine.trim() || rawLine.trimStart().startsWith("#")) continue;
    const indent = rawLine.match(/^ */u)?.[0].length ?? 0;
    const content = rawLine.trim();
    while (stack.length > 1 && stack[stack.length - 1].indent >= indent) stack.pop();
    let current = stack[stack.length - 1];
    if (content.startsWith("- ")) {
      current = ensureYamlArrayContainer(current);
      const itemText = content.slice(2).trim();
      if (!itemText) {
        const item = {};
        current.value.push(item);
        stack.push({ indent, value: item, pending: false, parent: current.value, key: String(current.value.length - 1) });
        continue;
      }
      const keyValue = splitYamlKeyValue(itemText);
      if (keyValue) {
        const item = {};
        current.value.push(item);
        assignYamlKeyValue(item, keyValue, lineIndex);
        stack.push({ indent, value: item, pending: false, parent: current.value, key: String(current.value.length - 1) });
      } else {
        current.value.push(parseYamlScalar(itemText));
      }
      continue;
    }

    const parent = current.value;
    if (!record(parent)) throw new Error(`unsupported yaml mapping at line ${lineIndex + 1}`);
    const keyValue = splitYamlKeyValue(content);
    if (!keyValue) throw new Error(`unsupported yaml line ${lineIndex + 1}`);
    const assigned = assignYamlKeyValue(parent, keyValue, lineIndex);
    if (assigned.pending) stack.push({ indent, value: assigned.value, pending: true, parent, key: keyValue.key });
  }
  return root;
}

function ensureYamlArrayContainer(entry) {
  if (Array.isArray(entry.value)) return entry;
  if (entry.pending && entry.parent && entry.key) {
    const items = [];
    entry.parent[entry.key] = items;
    entry.value = items;
    entry.pending = false;
    return entry;
  }
  throw new Error("unsupported yaml sequence placement");
}

function splitYamlKeyValue(value) {
  const match = String(value ?? "").match(/^([^:]+):(.*)$/u);
  if (!match) return null;
  return { key: match[1].trim(), value: match[2].trim() };
}

function assignYamlKeyValue(target, keyValue, lineIndex) {
  if (!keyValue.key) throw new Error(`empty yaml key at line ${lineIndex + 1}`);
  if (!keyValue.value) {
    const child = {};
    target[keyValue.key] = child;
    return { value: child, pending: true };
  }
  target[keyValue.key] = parseYamlScalar(keyValue.value);
  return { value: target[keyValue.key], pending: false };
}

function parseYamlScalar(value) {
  const textValue = String(value ?? "").trim();
  if (!textValue) return "";
  if (textValue === "true") return true;
  if (textValue === "false") return false;
  if (textValue === "null" || textValue === "~") return null;
  if (/^-?\d+(?:\.\d+)?$/u.test(textValue)) return Number(textValue);
  if ((textValue.startsWith("\"") && textValue.endsWith("\"")) || (textValue.startsWith("'") && textValue.endsWith("'"))) return textValue.slice(1, -1);
  return textValue;
}

function normalizeTarget(value, env, sourceRelativePath) {
  const input = record(value);
  const node = text(env.HWLAB_ADMIN_SECRETS_ACTIVE_NODE) || text(input?.node) || DEFAULT_TARGET.node;
  const lane = text(env.HWLAB_ADMIN_SECRETS_ACTIVE_LANE) || text(input?.lane) || DEFAULT_TARGET.lane;
  return {
    node: node.toUpperCase(),
    lane,
    runtimeNamespace: text(input?.runtimeNamespace) || DEFAULT_TARGET.runtimeNamespace,
    infraNamespace: text(input?.infraNamespace) || DEFAULT_TARGET.infraNamespace,
    publicUrl: text(input?.publicUrl) || DEFAULT_TARGET.publicUrl,
    source: text(input?.source) || DEFAULT_TARGET.source,
    sourceRef: text(input?.sourceRef) || `${sourceRelativePath}#secretPlane.readModel.target`,
    upstreamSourceRef: text(input?.upstreamSourceRef) || "config/platform-infra/secret-plane.yaml#activeTarget"
  };
}

function normalizeEvidence(value) {
  const input = record(value);
  const components = record(input?.components);
  return {
    source: text(input?.source) || "pikasTech/unidesk#1282",
    issue: text(input?.issue) || "pikasTech/HWLAB#2277",
    command: text(input?.command) || "platform-infra secret-plane status --target JD01",
    validatedAt: text(input?.validatedAt) || "2026-06-30T03:21:49Z",
    fingerprint: text(input?.fingerprint),
    status: normalizeStatus(input?.status, "Ready"),
    components: {
      esoController: normalizeStatus(components?.esoController, "Ready"),
      esoWebhook: normalizeStatus(components?.esoWebhook, "Ready"),
      esoCertController: normalizeStatus(components?.esoCertController, "Ready"),
      secretStore: normalizeStatus(components?.secretStore, "Ready"),
      clusterSecretStore: normalizeStatus(components?.clusterSecretStore, "Ready"),
      sync: normalizeStatus(components?.sync, "Ready"),
      consumer: normalizeStatus(components?.consumer, "Ready")
    }
  };
}

function normalizeStore(value) {
  const input = record(value);
  return {
    kind: text(input?.kind) || "ClusterSecretStore",
    name: text(input?.name) || "hwlab-secret-plane-vault-cluster",
    namespace: text(input?.namespace) || "platform-infra",
    scope: text(input?.scope) || (text(input?.kind) === "SecretStore" ? "namespace" : "cluster"),
    status: "Ready",
    reason: "JD01 secret-plane status evidence reports Store Ready",
    valuesPrinted: false
  };
}

function normalizeExternalSecrets(secretPlane, target, store, evidence, sourceRelativePath) {
  const secrets = Array.isArray(secretPlane?.secrets) ? secretPlane.secrets : [];
  return secrets.map((secret, index) => normalizeExternalSecret(secret, index, secretPlane, target, store, evidence, sourceRelativePath));
}

function normalizeExternalSecret(secret, index, secretPlane, target, store, evidence, sourceRelativePath) {
  const item = record(secret) ?? {};
  const namespace = text(item.targetNamespace) || target.runtimeNamespace;
  const data = Array.isArray(item.data) ? item.data.map((entry, dataIndex) => normalizeSecretData(entry, dataIndex)) : [];
  const consumers = Array.isArray(item.consumers) ? item.consumers.map((consumer, consumerIndex) => normalizeConsumer(consumer, consumerIndex, evidence)) : [];
  const fingerprint = text(record(item.statusEvidence)?.fingerprint) || evidence.fingerprint;
  const status = normalizeStatus(record(item.statusEvidence)?.status, evidence.status);
  const name = text(item.externalSecretName) || `external-secret-${index + 1}`;
  const targetSecretName = text(item.targetSecretName) || name;
  return {
    id: text(item.id) || name,
    name,
    namespace,
    target,
    store: { kind: store.kind, name: store.name, namespace: store.namespace, scope: store.scope, status: store.status },
    status,
    ready: status === "Ready",
    reason: text(record(item.statusEvidence)?.reason) || `${evidence.source} validated JD01 read-only status`,
    message: "脱敏 read model only; secret values are never read or returned.",
    refreshInterval: text(item.refreshInterval) || text(secretPlane?.refreshInterval) || "1m",
    createdAt: null,
    lastRefreshTime: evidence.validatedAt,
    targetSecret: {
      name: targetSecretName,
      namespace,
      keys: data.map((entry) => ({ key: entry.targetKey, presence: fingerprint ? "present" : "unknown", fingerprint, valuesPrinted: false })),
      resourceVersion: text(record(item.statusEvidence)?.resourceVersion) || null,
      fingerprint,
      valuesPrinted: false
    },
    data,
    consumers,
    provenance: {
      configSource: `${sourceRelativePath}#secretPlane.secrets[${index}]`,
      statusSource: evidence.source,
      issue: evidence.issue,
      command: evidence.command,
      validatedAt: evidence.validatedAt
    },
    valuesPrinted: false,
    secretMaterialStored: false
  };
}

function normalizeSecretData(entry, index) {
  const item = record(entry) ?? {};
  const remoteRef = text(item.remoteRef);
  return {
    targetKey: text(item.targetKey) || `key-${index + 1}`,
    remoteRef: {
      path: redactRemoteRef(remoteRef),
      property: text(item.property) || null,
      version: text(item.version) || null,
      fingerprint: remoteRef ? sha256Text(remoteRef).slice(0, 16) : null,
      redacted: true
    }
  };
}

function normalizeConsumer(value, index, evidence) {
  const input = record(value) ?? {};
  const serviceId = text(input.serviceId) || `consumer-${index + 1}`;
  return {
    serviceId,
    kind: text(input.kind) || "Deployment",
    injectAs: text(input.injectAs) || "env",
    envName: text(input.envName) || null,
    status: evidence.components.consumer,
    rollout: evidence.components.consumer === "Ready" ? "Ready" : "RolloutPending",
    revision: text(input.revision) || null,
    valuesPrinted: false
  };
}

function buildEvents({ target, store, externalSecrets, evidence, sourceError }) {
  const events = [];
  if (sourceError) {
    events.push(event("Unknown", "ConfigUnavailable", target.runtimeNamespace, "secret-plane", sourceError, target, evidence));
  }
  for (const secret of externalSecrets) {
    events.push(event(secret.status, `${secret.status}ExternalSecret`, secret.namespace, secret.name, secret.reason, target, evidence, {
      resourceKind: "ExternalSecret",
      resourceName: secret.name
    }));
    events.push(event(store.status, `${store.status}Store`, store.namespace, store.name, "SecretStore / ClusterSecretStore readiness is exposed as redacted status.", target, evidence, {
      resourceKind: store.kind,
      resourceName: store.name
    }));
  }
  return events.sort((left, right) => String(right.observedAt).localeCompare(String(left.observedAt)));
}

function event(status, reason, namespace, name, message, target, evidence, extra = {}) {
  return {
    status,
    reason,
    namespace,
    resourceKind: extra.resourceKind || "SecretPlane",
    resourceName: extra.resourceName || name,
    message: summarizeMessage(message),
    observedAt: evidence.validatedAt || new Date().toISOString(),
    target,
    traceId: null,
    jobId: null,
    source: evidence.source,
    valuesPrinted: false
  };
}

function componentStatuses(evidence) {
  return Object.values(evidence.components);
}

function consumerRolloutSummary(externalSecrets) {
  const consumers = externalSecrets.flatMap((item) => item.consumers);
  return {
    total: consumers.length,
    ready: consumers.filter((item) => item.rollout === "Ready").length,
    pending: consumers.filter((item) => item.rollout !== "Ready").length,
    revision: consumers.find((item) => item.revision)?.revision ?? null
  };
}

function aggregateStatus(statuses) {
  for (const status of STATUS_PRIORITY) if (statuses.includes(status)) return status;
  return "Unknown";
}

function normalizeStatus(value, fallback = "Unknown") {
  const textValue = text(value);
  if (STATUS_PRIORITY.includes(textValue)) return textValue;
  if (/^(ready|ok|healthy|synced)$/iu.test(textValue)) return "Ready";
  if (/^(notready|unavailable)$/iu.test(textValue)) return "StoreUnavailable";
  if (/^(pending|progressing)$/iu.test(textValue)) return "RolloutPending";
  if (/^(failed|error)$/iu.test(textValue)) return "SyncError";
  return fallback;
}

function hasLeakRisk(value) {
  const stack = [value];
  while (stack.length > 0) {
    const current = stack.pop();
    if (Array.isArray(current)) {
      stack.push(...current);
      continue;
    }
    if (!current || typeof current !== "object") continue;
    for (const [key, item] of Object.entries(current)) {
      if (/^(value|raw|secretValue|decoded|base64|authorization|cookie|token|apiKey|password)$/u.test(key) && typeof item === "string" && item.trim()) return true;
      if (item && typeof item === "object") stack.push(item);
    }
  }
  return false;
}

function redactRemoteRef(value) {
  const textValue = text(value);
  if (!textValue) return null;
  const parts = textValue.split("/").filter(Boolean);
  if (parts.length <= 1) return `${textValue.slice(0, 4)}...`;
  return `${parts[0]}/.../${parts[parts.length - 1]}`;
}

function summarizeMessage(value) {
  const message = text(value);
  return message.length > 220 ? `${message.slice(0, 217)}...` : message;
}

function secretsError(code, message, status = 500, details = {}) {
  return {
    ok: false,
    status: "failed",
    contractVersion: CONTRACT_VERSION,
    valuesPrinted: false,
    secretMaterialStored: false,
    error: {
      code,
      message,
      layer: "admin-secrets",
      retryable: false,
      valuesPrinted: false,
      ...details
    },
    httpStatus: status
  };
}

function numericStatus(value) {
  const number = Number(value);
  return Number.isInteger(number) && number >= 100 && number <= 599 ? number : null;
}

function positiveInteger(value, fallback) {
  const number = Number.parseInt(String(value ?? ""), 10);
  return Number.isInteger(number) && number > 0 ? number : fallback;
}

function record(value) {
  return value && typeof value === "object" && !Array.isArray(value) ? value : null;
}

function text(value) {
  if (value === null || value === undefined) return "";
  return String(value).trim();
}

function sha256Text(value) {
  return createHash("sha256").update(text(value)).digest("hex");
}