import { timingSafeEqual } from "node:crypto";
import type { FastifyInstance } from "fastify";
import { saveActiveTables } from "../services/state.js";

function safeEqual(a: string, b: string): boolean {
  const ba = Buffer.from(a || "");
  const bb = Buffer.from(b || "");
  if (ba.length !== bb.length) return false;
  return timingSafeEqual(ba, bb);
}

/**
 * Admin actions for the /crush33 area — all gated by the same PORTAL_PASSWORD
 * that unlocks the portal. POST-only so the password never lands in a URL/log.
 *
 *   POST /api/admin/status        -> current event tables + record counts
 *   POST /api/admin/wipe          -> delete all ticket + audit records
 *   POST /api/admin/switch-table  -> point the app at different event table(s)
 *   POST /api/admin/donor-search  -> admin-only donor directory search (PII)
 */
export async function adminRoutes(app: FastifyInstance): Promise<void> {
  const cfg = app.ctx.config;

  const gate = (req: any, reply: any): boolean => {
    if (!cfg.PORTAL_PASSWORD) {
      reply.code(404).send({ error: "admin_disabled" });
      return false;
    }
    const pw = (req.body ?? {}).password;
    if (typeof pw !== "string" || !safeEqual(pw, cfg.PORTAL_PASSWORD)) {
      reply.code(401).send({ error: "bad_password" });
      return false;
    }
    return true;
  };

  const rl = { config: { rateLimit: { max: 30, timeWindow: "1 minute" } } };

  app.post("/api/admin/status", rl, async (req, reply) => {
    if (!gate(req, reply)) return;
    const [tickets, audit] = await Promise.all([
      app.ctx.nocodb.count().catch(() => -1),
      app.ctx.audit.count().catch(() => -1),
    ]);
    return {
      tickets: { tableId: app.ctx.nocodb.tableId, count: tickets },
      audit: { tableId: app.ctx.audit.currentTableId, count: audit, enabled: app.ctx.audit.enabled },
      // What .env would use if the override were cleared (for reference).
      defaults: { ticketsTableId: cfg.NOCODB_TABLE_ID, auditTableId: cfg.NOCODB_AUDIT_TABLE_ID ?? null },
    };
  });

  app.post("/api/admin/wipe", rl, async (req, reply) => {
    if (!gate(req, reply)) return;
    let ticketsDeleted = 0;
    let auditDeleted = 0;
    try {
      ticketsDeleted = await app.ctx.nocodb.deleteAll();
    } catch (e: any) {
      return reply.code(502).send({ error: "wipe_failed", detail: e?.message });
    }
    try {
      auditDeleted = await app.ctx.audit.deleteAll();
    } catch {
      // Audit wipe is best-effort; tickets are the important part.
    }
    req.log.warn({ ticketsDeleted, auditDeleted }, "admin: wiped slate");
    return { ok: true, ticketsDeleted, auditDeleted };
  });

  app.post("/api/admin/switch-table", rl, async (req, reply) => {
    if (!gate(req, reply)) return;
    const b = (req.body ?? {}) as { ticketsTableId?: string; auditTableId?: string };
    const ticketsTableId = String(b.ticketsTableId ?? "").trim();
    const auditTableId = String(b.auditTableId ?? "").trim();
    if (!ticketsTableId) {
      return reply.code(400).send({ error: "missing_tickets_table" });
    }

    // Validate the new tickets table is reachable and has an Id primary key —
    // switching to a PK-less table would make check-in updates hit every row.
    const probe = await app.ctx.nocodb.probeTable(ticketsTableId);
    if (!probe.ok) {
      return reply.code(400).send({ error: "tickets_table_unreachable", status: probe.status });
    }
    if (!probe.hasIdPk) {
      return reply.code(400).send({ error: "tickets_table_no_id_pk" });
    }
    if (auditTableId) {
      const ap = await app.ctx.nocodb.probeTable(auditTableId);
      if (!ap.ok) return reply.code(400).send({ error: "audit_table_unreachable", status: ap.status });
    }

    // Hot-swap the live clients, then persist so it survives a redeploy.
    app.ctx.nocodb.setTableId(ticketsTableId);
    app.ctx.audit.setTableId(auditTableId || app.ctx.audit.currentTableId);
    saveActiveTables(cfg.STATE_DIR, {
      ticketsTableId,
      auditTableId: auditTableId || app.ctx.audit.currentTableId || undefined,
    });
    req.log.warn({ ticketsTableId, auditTableId }, "admin: switched event table");
    return {
      ok: true,
      tickets: { tableId: app.ctx.nocodb.tableId },
      audit: { tableId: app.ctx.audit.currentTableId },
    };
  });

  app.post("/api/admin/donor-search", rl, async (req, reply) => {
    if (!gate(req, reply)) return;
    if (!app.ctx.donors.enabled) return reply.code(404).send({ error: "donors_unavailable" });
    const q = String(((req.body ?? {}) as { query?: string }).query ?? "").trim();
    if (q.length < 2) return { results: [], query: q };
    try {
      const results = await app.ctx.donors.search(q, 40);
      return { results, query: q };
    } catch (e: any) {
      req.log.error({ err: e }, "admin: donor search failed");
      return reply.code(502).send({ error: "search_failed", detail: e?.message });
    }
  });
}