import {
  RUNTIME_DURABLE_ADAPTER_MISSING,
  RUNTIME_DURABLE_ADAPTER_AUTH_BLOCKED,
  RUNTIME_DURABLE_ADAPTER_DRIVER_MISSING,
  RUNTIME_DURABLE_ADAPTER_MIGRATION_BLOCKED,
  RUNTIME_DURABLE_ADAPTER_QUERY_BLOCKED,
  RUNTIME_DURABLE_ADAPTER_SCHEMA_BLOCKED,
  RUNTIME_DURABLE_ADAPTER_SSL_BLOCKED,
  RUNTIME_DURABLE_ADAPTER_UNCONFIGURED,
  RUNTIME_DURABILITY_REQUIRED_EVIDENCE,
  RUNTIME_STORE_KIND_POSTGRES
} from "../db/runtime-store.ts";

export const CLOUD_API_HEALTH_CONTRACT_VERSION = "v3";

export function buildCloudApiReadiness({ db, codeAgent, runtime } = {}) {
  const dbReady = isDbReady(db);
  const codeAgentReady = isCodeAgentReady(codeAgent);
  const runtimeReady = isRuntimeReady(runtime);
  const blockers = [];
  let runtimeReadinessBlocker = null;

  if (!dbReady) {
    blockers.push(dbBlocker(db));
  }

  if (!codeAgentReady) {
    blockers.push(codeAgentBlocker(codeAgent));
  }

  if (!runtimeReady) {
    runtimeReadinessBlocker = runtimeBlocker(runtime);
    blockers.push(runtimeReadinessBlocker);
  }
  const provider = buildProviderReadiness(codeAgent);
  const dbDurable = buildRuntimeDurabilityReadiness({
    db,
    runtime,
    runtimeReady,
    runtimeBlocker: runtimeReadinessBlocker
  });
  const sessionRunner = buildSessionRunnerReadiness(codeAgent);
  const codexStdio = buildCodexStdioReadiness(codeAgent);
  const codeAgentReadiness = buildCodeAgentStructuredReadiness({
    provider,
    dbDurable,
    sessionRunner,
    codexStdio,
    codeAgent
  });

  return {
    contractVersion: CLOUD_API_HEALTH_CONTRACT_VERSION,
    ready: blockers.length === 0,
    status: blockers.length === 0 ? "ok" : "degraded",
    blockerCodes: blockers.map((blocker) => blocker.code),
    blockers,
    components: {
      db: dbReady ? "ready" : "blocked",
      codeAgent: codeAgentReady ? "ready" : "blocked",
      runtime: runtimeReady ? "ready" : dbReady ? "blocked" : "waiting_for_db",
      provider: provider.status,
      dbDurable: dbDurable.status,
      sessionRunner: sessionRunner.status,
      codexStdio: codexStdio.status
    },
    provider,
    dbDurable,
    sessionRunner,
    codexStdio,
    codeAgent: codeAgentReadiness,
    durability: dbDurable
  };
}

function isDbReady(db) {
  return Boolean(db?.ready && db?.connected && db?.liveConnected !== false && db?.liveDbEvidence);
}

function isCodeAgentReady(codeAgent) {
  return Boolean(
    codeAgent?.ready === true &&
    codeAgent?.longLivedSessionGate?.status === "pass" &&
    codeAgent?.codexStdioFeasibility?.canStartLongLivedCodexStdio === true
  );
}

function isRuntimeReady(runtime) {
  if (runtime?.durable !== true) {
    return false;
  }
  if (runtime?.ready !== true || runtime?.liveRuntimeEvidence !== true) {
    return false;
  }
  return !["blocked", "degraded", "failed"].includes(runtime.status);
}

function dbBlocker(db) {
  return {
    code: db?.configReady ? "db_live_connection_blocked" : "db_runtime_config_blocked",
    type: "runtime_blocker",
    scope: "cloud-api-db",
    status: "open",
    sourceIssue: "pikasTech/HWLAB#49",
    summary: db?.blocker ?? "cloud-api DB live readiness is not established",
    evidence: {
      configReady: Boolean(db?.configReady),
      connected: Boolean(db?.connected),
      liveConnected: Boolean(db?.liveConnected),
      liveDbEvidence: Boolean(db?.liveDbEvidence),
      connectionAttempted: Boolean(db?.connectionAttempted ?? db?.connectionChecked),
      connectionResult: db?.connectionResult ?? db?.connection?.result ?? "unknown"
    }
  };
}

function codeAgentBlocker(codeAgent) {
  const primaryBlocker = Array.isArray(codeAgent?.blockers) ? codeAgent.blockers[0] : null;
  return {
    code: codeAgent?.reason ?? primaryBlocker?.code ?? "code_agent_long_lived_session_blocked",
    type: "agent_blocker",
    scope: "code-agent-long-lived-session",
    status: "open",
    sourceIssue: primaryBlocker?.sourceIssue ?? "pikasTech/HWLAB#275",
    summary: codeAgent?.summary ?? "Code Agent provider readiness is not established",
    evidence: {
      provider: codeAgent?.provider ?? "unknown",
      backend: codeAgent?.backend ?? "unknown",
      agentKind: codeAgent?.agentKind ?? "unknown",
      capabilityStatus: codeAgent?.capabilityStatus ?? "unknown",
      longLivedSessionGate: codeAgent?.longLivedSessionGate ?? null,
      codexStdioFeasibility: codeAgent?.codexStdioFeasibility ?? null,
      partialReady: codeAgent?.partialReady === true,
      missingEnv: Array.isArray(codeAgent?.missingEnv) ? [...codeAgent.missingEnv] : [],
      secretsRedacted: true
    }
  };
}

function runtimeBlocker(runtime) {
  const durable = runtime?.durable === true;
  const durableRequested = runtime?.durableRequested === true || runtime?.adapter === RUNTIME_STORE_KIND_POSTGRES;
  const unhealthy = (durable || durableRequested) && ["blocked", "degraded", "failed"].includes(runtime?.status);
  const blocker = runtime?.blocker;
  const blockedLayer = classifyRuntimeDurabilityLayer(runtime);
  return {
    code: durableRequested && unhealthy ? blocker ?? "runtime_durable_adapter_unhealthy" : RUNTIME_DURABLE_ADAPTER_MISSING,
    type: "runtime_blocker",
    scope: "runtime-durable-adapter",
    status: "open",
    sourceIssue: "pikasTech/HWLAB#164",
    summary: durableRequested && unhealthy
      ? runtime?.reason ?? "cloud-api durable runtime adapter is configured but not ready"
      : "cloud-api DB is live, but L1 runtime writes still use process-local memory because no DB-backed durable adapter is configured",
    evidence: {
      adapter: runtime?.adapter ?? "unknown",
      durable: Boolean(runtime?.durable),
      durableRequested: Boolean(runtime?.durableRequested),
      durableCapable: Boolean(runtime?.durableCapable),
      runtimeStatus: runtime?.status ?? "unknown",
      runtimeReady: Boolean(runtime?.ready),
      liveRuntimeEvidence: Boolean(runtime?.liveRuntimeEvidence),
      schemaReady: Boolean(runtime?.schema?.ready),
      schemaChecked: Boolean(runtime?.schema?.checked),
      migrationReady: Boolean(runtime?.migration?.ready),
      migrationChecked: Boolean(runtime?.migration?.checked),
      gates: runtime?.gates ?? null,
      blockedLayer,
      queryAttempted: Boolean(runtime?.connection?.queryAttempted),
      queryResult: runtime?.connection?.queryResult ?? "unknown",
      dbBackedAdapterRequired: true,
      dbLiveEvidenceIsDurabilityEvidence: false,
      requiredEvidence: runtime?.durabilityContract?.requiredEvidence ?? RUNTIME_DURABILITY_REQUIRED_EVIDENCE,
      secretMaterialRead: false
    },
    nextTask: durableRequested
      ? "Apply/repair the runtime DB schema or DB auth, then rerun /health/live without printing DB secret material."
      : "Set HWLAB_CLOUD_RUNTIME_ADAPTER=postgres after the runtime DB schema is available; keep HWLAB_CLOUD_DB_URL injected from Secret."
  };
}

function buildRuntimeDurabilityReadiness({ db, runtime, runtimeReady, runtimeBlocker } = {}) {
  const dbLiveEvidenceObserved = Boolean(db?.ready && db?.connected && db?.liveConnected !== false && db?.liveDbEvidence);
  const contract = runtime?.durabilityContract ?? {};
  return {
    status: runtimeReady ? "ready" : "blocked",
    ready: runtimeReady,
    adapter: runtime?.adapter ?? "unknown",
    durable: Boolean(runtime?.durable),
    durableRequested: Boolean(runtime?.durableRequested || runtime?.adapter === RUNTIME_STORE_KIND_POSTGRES),
    durableCapable: Boolean(runtime?.durableCapable),
    runtimeStatus: runtime?.status ?? "unknown",
    runtimeReady: Boolean(runtime?.ready),
    liveRuntimeEvidence: Boolean(runtime?.liveRuntimeEvidence),
    dbLiveEvidenceObserved,
    dbLiveEvidenceIsDurabilityEvidence: false,
    requiredEvidence: contract.requiredEvidence ?? RUNTIME_DURABILITY_REQUIRED_EVIDENCE,
    blockedLayer: runtimeReady ? null : contract.blockedLayer ?? classifyRuntimeDurabilityLayer(runtime),
    blocker: runtimeReady ? null : runtimeBlocker?.code ?? runtime?.blocker ?? RUNTIME_DURABLE_ADAPTER_MISSING,
    gates: runtime?.gates ?? null,
    queryAttempted: Boolean(runtime?.connection?.queryAttempted),
    queryResult: runtime?.connection?.queryResult ?? "unknown",
    secretMaterialRead: false
  };
}

function buildProviderReadiness(codeAgent = {}) {
  const fallback = codeAgent?.fallback ?? {};
  const fallbackReady = fallback.ready === true || fallback.status === "available";
  const tokenBoundary = codeAgent?.codexStdioFeasibility?.tokenBoundary ?? codeAgent?.codexStdio?.tokenBoundary ?? null;
  const stdioTokenBoundaryReady = codeAgent?.mode === "codex-stdio" && tokenBoundary?.present === true && codeAgent?.egress?.directPublicOpenAi !== true;
  const ready = fallbackReady || stdioTokenBoundaryReady;
  const missingEnv = Array.isArray(codeAgent?.missingEnv) ? [...codeAgent.missingEnv] : [];
  const blocker = ready ? null : providerBlockerCode(codeAgent, fallback);
  return {
    status: ready ? "ready" : "blocked",
    ready,
    configured: ready,
    provider: codeAgent?.provider ?? fallback.provider ?? "unknown",
    model: codeAgent?.model ?? fallback.model ?? "unknown",
    backend: codeAgent?.backend ?? fallback.backend ?? "unknown",
    mode: codeAgent?.mode ?? fallback.mode ?? "unknown",
    evidence: "runtime_config_redacted",
    egressReady: Boolean(fallback?.egress?.ready ?? codeAgent?.egress?.ready),
    missingEnv,
    blocker,
    secretMaterialRead: false,
    valuesRedacted: true
  };
}

function buildSessionRunnerReadiness(codeAgent = {}) {
  const stdio = codeAgent?.codexStdioFeasibility ?? codeAgent?.codexStdio ?? {};
  const stdioCommandReady = stdio.commandProbe?.ready === true;
  const stdioReady = (stdio.ready === true || stdio.canStartLongLivedCodexStdio === true) && stdioCommandReady;
  const runner = codeAgent?.runner ?? {};
  const runnerReady = stdioReady;
  const status = stdioReady ? "codex_stdio_ready" : "blocked";
  const blocker = runnerReady ? null : firstCode(
    runner.blocker,
    codeAgent?.reason,
    codeAgent?.blockerCodes?.[0],
    codeAgent?.blockers?.[0]?.code,
    "session_runner_blocked"
  );
  return {
    status,
    ready: runnerReady,
    kind: stdioReady ? stdio.kind ?? "codex-app-server-stdio-runner" : runner.kind ?? "unknown",
    provider: stdioReady ? stdio.provider ?? "codex-stdio" : runner.provider ?? codeAgent?.provider ?? "unknown",
    backend: stdioReady ? stdio.backend ?? "hwlab-cloud-api/codex-app-server-stdio" : runner.backend ?? codeAgent?.backend ?? "unknown",
    mode: stdioReady ? "codex-app-server-stdio-long-lived" : runner.sessionMode ?? runner.mode ?? codeAgent?.sessionMode ?? "unknown",
    capabilityLevel: stdioReady ? "long-lived-codex-stdio-session" : runner.capabilityLevel ?? codeAgent?.capabilityLevel ?? "unknown",
    longLivedSession: stdioReady || runner.longLivedSession === true,
    durableSession: stdioReady || runner.durableSession === true || runner.durable === true,
    codexStdio: stdioReady || runner.codexStdio === true,
    writeCapable: stdioReady || runner.writeCapable === true,
    readOnly: !stdioReady && runner.codexStdio !== true && runner.writeCapable === false,
    blocker,
    runnerLimitations: Array.isArray(codeAgent?.runnerLimitations) ? [...codeAgent.runnerLimitations] : [],
    secretMaterialRead: false
  };
}

function buildCodexStdioReadiness(codeAgent = {}) {
  const stdio = codeAgent?.codexStdioFeasibility ?? codeAgent?.codexStdio ?? {};
  const commandReady = stdio.commandProbe?.ready === true;
  const ready = (stdio.ready === true || stdio.canStartLongLivedCodexStdio === true) && commandReady;
  const blockerCodes = Array.isArray(stdio.blockerCodes)
    ? [...stdio.blockerCodes]
    : Array.isArray(stdio.blockers)
      ? stdio.blockers.map((blocker) => blocker?.code).filter(Boolean)
      : [];
  const effectiveBlockerCodes = [...blockerCodes];
  if ((stdio.ready === true || stdio.canStartLongLivedCodexStdio === true) && !commandReady) {
    effectiveBlockerCodes.unshift("codex_stdio_command_probe_failed");
  }
  const blocker = ready ? null : firstCode(effectiveBlockerCodes[0], stdio.blockers?.[0]?.code, codeAgent?.longLivedSessionGate?.blockers?.[0]?.code, "codex_stdio_feasibility_blocked");
  return {
    status: ready ? "ready" : "blocked",
    ready,
    feasible: ready,
    blocker,
    blockerCodes: effectiveBlockerCodes,
    sourceIssue: stdio.sourceIssue ?? "pikasTech/HWLAB#275",
    commandPresent: stdio.binaryOnPath === true,
    commandExecutable: stdio.binary?.executable === true,
    nativeDependencyPresent: stdio.binary?.nativeDependencyPresent === true,
    commandProbeReady: commandReady,
    commandProbe: stdio.commandProbe ?? null,
    supervisorConfigured: stdio.supervisor?.configured === true,
    workspaceReady: stdio.workspaceState?.exists === true && stdio.workspaceState?.readable === true,
    tokenBoundaryPresent: stdio.tokenBoundary?.present === true,
    egressReady: stdio.egress?.directPublicOpenAi !== true,
    secretMaterialRead: false
  };
}

function buildCodeAgentStructuredReadiness({ provider, dbDurable, sessionRunner, codexStdio, codeAgent } = {}) {
  const currentBlockers = [
    provider?.ready === false ? provider.blocker ?? "provider_config_blocked" : null,
    dbDurable?.ready === false ? dbDurable.blocker ?? "runtime_durable_adapter_not_ready" : null,
    sessionRunner?.ready === false ? sessionRunner.blocker ?? "session_runner_blocked" : null,
    codexStdio?.ready === false ? codexStdio.blocker ?? "codex_stdio_feasibility_blocked" : null
  ].filter(Boolean);
  const ready = provider?.ready === true &&
    dbDurable?.ready === true &&
    sessionRunner?.ready === true &&
    codexStdio?.ready === true &&
    codeAgent?.ready === true;
  return {
    status: ready ? "ready" : currentBlockers.length > 0 ? "blocked" : "degraded",
    ready,
    providerReady: provider?.ready === true,
    durableDbReady: dbDurable?.ready === true,
    sessionRunnerReady: sessionRunner?.ready === true,
    codexStdioFeasible: codexStdio?.ready === true,
    currentBlocker: currentBlockers[0] ?? null,
    currentBlockers,
    provider: {
      status: provider?.status ?? "unknown",
      ready: provider?.ready === true,
      provider: provider?.provider ?? "unknown",
      backend: provider?.backend ?? "unknown",
      mode: provider?.mode ?? "unknown",
      blocker: provider?.blocker ?? null
    },
    dbDurable: {
      status: dbDurable?.status ?? "unknown",
      ready: dbDurable?.ready === true,
      adapter: dbDurable?.adapter ?? "unknown",
      blocker: dbDurable?.blocker ?? null,
      blockedLayer: dbDurable?.blockedLayer ?? null,
      queryResult: dbDurable?.queryResult ?? "unknown"
    },
    sessionRunner: {
      status: sessionRunner?.status ?? "unknown",
      ready: sessionRunner?.ready === true,
      kind: sessionRunner?.kind ?? "unknown",
      mode: sessionRunner?.mode ?? "unknown",
      capabilityLevel: sessionRunner?.capabilityLevel ?? "unknown",
      longLivedSession: sessionRunner?.longLivedSession === true,
      durableSession: sessionRunner?.durableSession === true,
      codexStdio: sessionRunner?.codexStdio === true,
      writeCapable: sessionRunner?.writeCapable === true,
      blocker: sessionRunner?.blocker ?? null
    },
    codexStdio: {
      status: codexStdio?.status ?? "unknown",
      ready: codexStdio?.ready === true,
      feasible: codexStdio?.feasible === true,
      blocker: codexStdio?.blocker ?? null,
      blockerCodes: Array.isArray(codexStdio?.blockerCodes) ? [...codexStdio.blockerCodes] : []
    },
    secretMaterialRead: false,
    valuesRedacted: true
  };
}

function providerBlockerCode(codeAgent = {}, fallback = {}) {
  if (Array.isArray(codeAgent?.missingEnv) && codeAgent.missingEnv.length > 0) return "provider_config_blocked";
  if (fallback?.egress?.directPublicOpenAi === true || codeAgent?.egress?.directPublicOpenAi === true) return "provider_egress_blocked";
  return firstCode(fallback.reason, codeAgent?.reason, "provider_config_blocked");
}

function firstCode(...values) {
  for (const value of values) {
    if (typeof value === "string" && value.trim()) return value.trim();
  }
  return null;
}

function classifyRuntimeDurabilityLayer(runtime = {}) {
  const contractLayer = runtime?.durabilityContract?.blockedLayer;
  if (typeof contractLayer === "string" && contractLayer.length > 0) {
    return contractLayer;
  }

  const blocker = runtime?.blocker;
  if (
    blocker === RUNTIME_DURABLE_ADAPTER_MISSING ||
    blocker === RUNTIME_DURABLE_ADAPTER_UNCONFIGURED ||
    blocker === RUNTIME_DURABLE_ADAPTER_DRIVER_MISSING
  ) {
    return "adapter";
  }
  if (blocker === RUNTIME_DURABLE_ADAPTER_AUTH_BLOCKED) {
    return "auth";
  }
  if (blocker === RUNTIME_DURABLE_ADAPTER_SSL_BLOCKED) {
    return "ssl";
  }
  if (blocker === RUNTIME_DURABLE_ADAPTER_SCHEMA_BLOCKED) {
    return "schema";
  }
  if (blocker === RUNTIME_DURABLE_ADAPTER_MIGRATION_BLOCKED) {
    return "migration";
  }
  if (blocker === RUNTIME_DURABLE_ADAPTER_QUERY_BLOCKED || runtime?.connection?.queryAttempted) {
    return "durability_query";
  }
  return "adapter";
}