/**
 * Admin crypto treasury endpoints.
 *
 * All endpoints require the admin token (X-Admin-Token header) — same
 * gate used by admin-filings and reseller-certs. Read-only endpoints
 * return 200; mutating endpoints audit to order_audit_log.
 */

import crypto from "node:crypto";
import { Router } from "express";
import type { Request, Response } from "express";
import { pool } from "../db.js";

const router = Router();

// ── Auth middleware ─────────────────────────────────────────────────────

function requireAdminToken(req: Request, res: Response): boolean {
  const expected = process.env.ADMIN_API_TOKEN || "";
  const supplied = (req.headers["x-admin-token"] || "").toString().trim();
  if (!expected) {
    // If token not configured, reject — fail-closed.
    res.status(503).json({ error: "ADMIN_API_TOKEN not set" });
    return false;
  }
  // Timing-safe compare. timingSafeEqual throws on length mismatch, so
  // guard with a length check first (a cheap length-disclosure trade-off
  // that's negligible compared to the attack surface of naïve ==).
  const sb = Buffer.from(supplied);
  const eb = Buffer.from(expected);
  const ok = sb.length === eb.length && crypto.timingSafeEqual(sb, eb);
  if (!ok) {
    res.status(403).json({ error: "forbidden" });
    return false;
  }
  return true;
}

async function auditLog(
  actor: string, action: string, target: string, details?: unknown,
) {
  // order_audit_log schema requires: order_type IN ('formation','service','quote'),
  // order_id (integer, NOT NULL), action, actor_type IN
  // ('system','admin','worker','customer') + optional order_number,
  // actor_name, metadata. We use order_type='service' (closest match —
  // crypto treasury is an internal service action) and store the real
  // crypto-treasury target (order_number or 'sweep:N') in order_number.
  try {
    await pool.query(
      `INSERT INTO order_audit_log
         (order_type, order_id, order_number, action, actor_type, actor_name, metadata)
       VALUES ('service', 0, $1, $2, 'admin', $3, $4::jsonb)`,
      [target, action, actor, JSON.stringify(details ?? {})],
    );
  } catch (err) {
    console.error("[admin-crypto] audit log failed:", err);
    // non-fatal
  }
}

// ── GET /api/v1/admin/crypto-payments ───────────────────────────────────

router.get(
  "/api/v1/admin/crypto-payments",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;

    const stateFilter = typeof req.query.state === "string" ? req.query.state : "";
    const params: (string | number)[] = [];
    const where: string[] = [];
    if (stateFilter) {
      where.push(`j.state = $${params.length + 1}`);
      params.push(stateFilter);
    }
    const whereSql = where.length ? `WHERE ${where.join(" AND ")}` : "";

    const r = await pool.query(
      `
      SELECT j.order_id, j.order_type, j.state, j.coin,
             j.amount_coin, j.amount_usd_cents, j.needed_usd_cents,
             j.offramp_provider, j.offramp_ref, j.relay_deposit_id,
             j.target_card_id, j.last_error, j.attempt_count,
             j.next_retry_at, j.received_at, j.funds_at_relay_at, j.settled_at,
             j.created_at, j.updated_at,
             (
               SELECT COALESCE(SUM(amount_usd_cents), 0)
                 FROM vendor_obligations
                WHERE order_id = j.order_id
             ) AS total_obligations_cents,
             (
               SELECT COUNT(*)
                 FROM vendor_obligations
                WHERE order_id = j.order_id AND status = 'paid'
             ) AS obligations_paid
        FROM crypto_payment_jobs j
        ${whereSql}
       ORDER BY j.created_at DESC
       LIMIT 200
      `,
      params,
    );
    res.json({ jobs: r.rows, count: r.rows.length });
  },
);

// NOTE: specific paths (sweeps, tax-export) are registered BELOW before
// the /:order_id param route to avoid Express pattern-match conflicts
// (order_id='sweeps' would otherwise match this handler).

// ── GET /api/v1/admin/crypto-payments/:order_id ────────────────────────
// Registered AFTER the specific sub-paths below. Express matches in
// registration order; putting this last ensures /sweeps and
// /tax-export aren't interpreted as order_ids.

// ── Detail view (must come AFTER specific sub-paths below) ────────────
//
// We re-register this at the end of the file so Express pattern-matches
// /sweeps and /tax-export first.

// ── POST /api/v1/admin/crypto-payments/:order_id/retry-offramp ─────────

router.post(
  "/api/v1/admin/crypto-payments/:order_id/retry-offramp",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const orderId = req.params.order_id;

    const r = await pool.query(
      `UPDATE crypto_payment_jobs
          SET state = 'sizing',
              last_error = NULL,
              next_retry_at = NULL,
              updated_at = NOW()
        WHERE order_id = $1
          AND state IN ('manual','failed','offramping')
        RETURNING state, attempt_count`,
      [orderId],
    );
    if (r.rows.length === 0) {
      res.status(409).json({
        error: "job not in a retry-able state (must be manual / failed / offramping)",
      });
      return;
    }
    await auditLog(
      req.headers["x-admin-user"]?.toString() || "admin",
      "crypto_retry_offramp", orderId, { new_state: "sizing" },
    );
    res.json({ ok: true, state: r.rows[0].state });
  },
);

// ── POST /api/v1/admin/crypto-payments/:order_id/mark-settled ──────────

router.post(
  "/api/v1/admin/crypto-payments/:order_id/mark-settled",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const orderId = req.params.order_id;
    const { note } = req.body ?? {};

    const r = await pool.query(
      `UPDATE crypto_payment_jobs
          SET state = 'settled',
              settled_at = NOW(),
              last_error = NULL,
              updated_at = NOW()
        WHERE order_id = $1
        RETURNING state`,
      [orderId],
    );
    if (r.rows.length === 0) {
      res.status(404).json({ error: "job not found" }); return;
    }
    await auditLog(
      req.headers["x-admin-user"]?.toString() || "admin",
      "crypto_manual_settle", orderId, { note },
    );
    res.json({ ok: true });
  },
);

// ── GET /api/v1/admin/crypto-payments/sweeps ───────────────────────────

router.get(
  "/api/v1/admin/crypto-payments/sweeps",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const r = await pool.query(
      `SELECT * FROM cold_wallet_sweeps
        WHERE status IN ('pending','approved','broadcast')
        ORDER BY created_at DESC
        LIMIT 100`,
    );
    res.json({ sweeps: r.rows });
  },
);

// ── POST /api/v1/admin/crypto-payments/sweeps/:id/approve ──────────────

router.post(
  "/api/v1/admin/crypto-payments/sweeps/:id/approve",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const sweepId = Number(req.params.id);
    if (!Number.isFinite(sweepId)) {
      res.status(400).json({ error: "bad sweep id" }); return;
    }
    const actor = req.headers["x-admin-user"]?.toString() || "admin";
    const r = await pool.query(
      `UPDATE cold_wallet_sweeps
          SET status = 'approved',
              approved_by = $2,
              approved_at = NOW(),
              updated_at = NOW()
        WHERE id = $1
          AND status = 'pending'
        RETURNING coin, amount_coin`,
      [sweepId, actor],
    );
    if (r.rows.length === 0) {
      res.status(409).json({ error: "sweep not in pending state" }); return;
    }
    await auditLog(actor, "crypto_sweep_approve", `sweep:${sweepId}`,
                   { coin: r.rows[0].coin, amount_coin: r.rows[0].amount_coin });
    res.json({ ok: true });
  },
);

// ── GET /api/v1/admin/crypto-payments/tax-export?year=YYYY ─────────────
//
// IRS Form 8949 columns: description, date_acquired, date_sold,
// proceeds, cost_basis, gain_loss. Covers all offramp/disposal rows
// whose disposed_at is in the given tax year.
router.get(
  "/api/v1/admin/crypto-payments/tax-export",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const year = Number(req.query.year) || new Date().getUTCFullYear() - 1;

    const r = await pool.query(
      `
      SELECT order_id, coin,
             amount_coin, fx_rate_usd,
             acquired_at, disposed_at,
             basis_usd_cents, proceeds_usd_cents,
             provider, provider_ref
        FROM crypto_payment_ledger
       WHERE movement_type = 'offramp'
         AND state IN ('pending','confirmed')
         AND disposed_at >= make_timestamptz($1, 1, 1, 0, 0, 0, 'UTC')
         AND disposed_at <  make_timestamptz($1 + 1, 1, 1, 0, 0, 0, 'UTC')
       ORDER BY disposed_at ASC, id ASC
      `,
      [year],
    );

    // Build the CSV
    const header = [
      "Description",            // e.g., "0.00873 BTC — Order CO-SMOKE02"
      "Date Acquired",          // MM/DD/YYYY
      "Date Sold",
      "Proceeds (USD)",
      "Cost Basis (USD)",
      "Gain/(Loss) (USD)",
      "Provider Reference",
    ];
    const lines: string[] = [header.join(",")];
    const fmt = (d: Date) =>
      `${String(d.getUTCMonth() + 1).padStart(2, "0")}/${String(d.getUTCDate()).padStart(2, "0")}/${d.getUTCFullYear()}`;
    for (const row of r.rows) {
      const amount = Number(row.amount_coin);
      const proceeds = Number(row.proceeds_usd_cents || 0) / 100;
      const basis = Number(row.basis_usd_cents || 0) / 100;
      const gain = proceeds - basis;
      const acquired = row.acquired_at ? fmt(new Date(row.acquired_at)) : "";
      const sold = row.disposed_at ? fmt(new Date(row.disposed_at)) : "";
      const desc = `${Math.abs(amount).toFixed(8)} ${row.coin} — Order ${row.order_id}`;
      lines.push([
        `"${desc}"`,
        `"${acquired}"`,
        `"${sold}"`,
        proceeds.toFixed(2),
        basis.toFixed(2),
        gain.toFixed(2),
        `"${row.provider_ref || ""}"`,
      ].join(","));
    }
    res.setHeader("Content-Type", "text/csv");
    res.setHeader(
      "Content-Disposition",
      `attachment; filename="crypto-disposals-${year}.csv"`,
    );
    res.send(lines.join("\n"));
  },
);

// ── GET /api/v1/admin/crypto-payments/:order_id (must be LAST) ─────────
// Registered last so specific paths above match first.
router.get(
  "/api/v1/admin/crypto-payments/:order_id",
  async (req: Request, res: Response) => {
    if (!requireAdminToken(req, res)) return;
    const orderId = req.params.order_id;

    const job = await pool.query(
      "SELECT * FROM crypto_payment_jobs WHERE order_id = $1",
      [orderId],
    );
    if (job.rows.length === 0) {
      res.status(404).json({ error: "job not found" }); return;
    }

    const [ledger, obligations, deposit] = await Promise.all([
      pool.query(
        `SELECT * FROM crypto_payment_ledger WHERE order_id = $1 ORDER BY created_at ASC`,
        [orderId],
      ),
      pool.query(
        `SELECT * FROM vendor_obligations WHERE order_id = $1 ORDER BY obligation_kind, id`,
        [orderId],
      ),
      job.rows[0].relay_deposit_id
        ? pool.query("SELECT * FROM relay_deposits WHERE id = $1", [job.rows[0].relay_deposit_id])
        : Promise.resolve({ rows: [] }),
    ]);

    res.json({
      job: job.rows[0],
      ledger: ledger.rows,
      obligations: obligations.rows,
      relay_deposit: deposit.rows[0] || null,
    });
  },
);

export default router;