import { executeSqliteQuerySync, getNodeSqliteKysely } from "../infra/kysely-sync.js";
// Stores config health fingerprints in shared SQLite state.
import type { DB as OpenClawStateKyselyDatabase } from "../state/openclaw-state-db.generated.js";
import {
  openOpenClawStateDatabase,
  runOpenClawStateWriteTransaction,
} from "../state/openclaw-state-db.js";

export type ConfigHealthFingerprint = {
  hash: string;
  bytes: number;
  mtimeMs: number | null;
  ctimeMs: number | null;
  dev: string | null;
  ino: string | null;
  mode: number | null;
  nlink: number | null;
  uid: number | null;
  gid: number | null;
  hasMeta: boolean;
  gatewayMode: string | null;
  observedAt: string;
};

export type ConfigHealthEntry = {
  lastKnownGood?: ConfigHealthFingerprint;
  lastPromotedGood?: ConfigHealthFingerprint;
  lastObservedSuspiciousSignature?: string | null;
};

export type ConfigHealthState = {
  entries?: Record<string, ConfigHealthEntry>;
};

type ConfigHealthDatabase = Pick<OpenClawStateKyselyDatabase, "config_health_entries">;

export type ConfigHealthStateDeps = {
  env: NodeJS.ProcessEnv;
  homedir: () => string;
  logger: Pick<typeof console, "warn">;
};

function resolveConfigHealthStateEnv(deps: ConfigHealthStateDeps): NodeJS.ProcessEnv {
  if (deps.env.OPENCLAW_HOME || deps.env.HOME || deps.env.USERPROFILE || deps.env.PREFIX) {
    return deps.env;
  }
  return { ...deps.env, HOME: deps.homedir() };
}

function parseConfigHealthFingerprint(value: string | null): ConfigHealthFingerprint | undefined {
  if (!value) {
    return undefined;
  }
  try {
    const parsed = JSON.parse(value) as ConfigHealthFingerprint;
    return parsed && typeof parsed === "object" ? parsed : undefined;
  } catch {
    return undefined;
  }
}

function stringifyConfigHealthFingerprint(
  value: ConfigHealthFingerprint | undefined,
): string | null {
  return value ? JSON.stringify(value) : null;
}

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

export function readConfigHealthStateFromStore(deps: ConfigHealthStateDeps): ConfigHealthState {
  try {
    const database = openOpenClawStateDatabase({ env: resolveConfigHealthStateEnv(deps) });
    const healthDb = getNodeSqliteKysely<ConfigHealthDatabase>(database.db);
    const rows = executeSqliteQuerySync(
      database.db,
      healthDb
        .selectFrom("config_health_entries")
        .select([
          "config_path",
          "last_known_good_json",
          "last_promoted_good_json",
          "last_observed_suspicious_signature",
        ])
        .orderBy("config_path", "asc"),
    ).rows;
    return {
      entries: Object.fromEntries(
        rows.map((row) => [
          row.config_path,
          {
            lastKnownGood: parseConfigHealthFingerprint(row.last_known_good_json),
            lastPromotedGood: parseConfigHealthFingerprint(row.last_promoted_good_json),
            lastObservedSuspiciousSignature: row.last_observed_suspicious_signature,
          } satisfies ConfigHealthEntry,
        ]),
      ),
    };
  } catch {
    return {};
  }
}

export function writeConfigHealthStateToStore(
  deps: ConfigHealthStateDeps,
  state: ConfigHealthState,
): void {
  try {
    const entries = Object.entries(state.entries ?? {});
    if (entries.length === 0) {
      return;
    }
    const updatedAtMs = Date.now();
    runOpenClawStateWriteTransaction(
      ({ db }) => {
        const healthDb = getNodeSqliteKysely<ConfigHealthDatabase>(db);
        executeSqliteQuerySync(
          db,
          healthDb
            .insertInto("config_health_entries")
            .values(
              entries.map(([configPath, entry]) => ({
                config_path: configPath,
                last_known_good_json: stringifyConfigHealthFingerprint(entry.lastKnownGood),
                last_promoted_good_json: stringifyConfigHealthFingerprint(entry.lastPromotedGood),
                last_observed_suspicious_signature: entry.lastObservedSuspiciousSignature ?? null,
                updated_at_ms: updatedAtMs,
              })),
            )
            .onConflict((conflict) =>
              conflict.column("config_path").doUpdateSet({
                last_known_good_json: (eb) => eb.ref("excluded.last_known_good_json"),
                last_promoted_good_json: (eb) => eb.ref("excluded.last_promoted_good_json"),
                last_observed_suspicious_signature: (eb) =>
                  eb.ref("excluded.last_observed_suspicious_signature"),
                updated_at_ms: (eb) => eb.ref("excluded.updated_at_ms"),
              }),
            ),
        );
      },
      { env: resolveConfigHealthStateEnv(deps) },
    );
  } catch (error) {
    deps.logger.warn(`Config health-state write failed: ${formatConfigHealthStateError(error)}`);
  }
}
