/**
 * Generic eSign portal — client signs any compliance document.
 *
 * GET  /api/v1/portal/esign  — document info + presigned PDF URL
 * POST /api/v1/portal/esign  — accept signature, advance pipeline
 *
 * Supported document types: rmd, cpni, calea, 499a-engagement,
 * discontinuance, crtc, and any future types added to esign_records.
 *
 * Flow:
 *   1. Service handler generates document, uploads PDF to MinIO
 *   2. Handler inserts row into esign_records (status = 'pending')
 *   3. Handler emails client a JWT link: /portal/esign?token=<jwt>
 *   4. Client opens page → GET /portal/esign → sees PDF + signing UI
 *   5. Client signs → POST /portal/esign → signature stored, status = 'signed'
 *   6. API dispatches resume job to workers so the pipeline continues
 *
 * The portal JWT carries { order_id, order_type, email }.
 * order_id = order_number, order_type = document_type.
 */

import { Router, type Request, type Response } from "express";
import { pool } from "../db.js";
import { requirePortalAuth } from "../middleware/portalAuth.js";
import {
  SIGN_CONSENT_TEXT,
  requiresSignConsent,
  signConsentSatisfied,
} from "./esign-sign-consent.js";

const router = Router();
const WORKER_URL = process.env.WORKER_URL || "http://workers:8090";

/** Ask the workers job server for a presigned MinIO GET URL. */
async function presignGet(key: string, expires = 3600): Promise<string | null> {
  if (!key) return null;
  try {
    const r = await fetch(`${WORKER_URL}/jobs/presign`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ key, expires, method: "GET" }),
    });
    if (!r.ok) return null;
    const data = (await r.json()) as { url?: string };
    return data.url || null;
  } catch {
    return null;
  }
}


// ── GET /api/v1/portal/esign ────────────────────────────────────────────────
//
// Returns document info for the signing page. Token identifies the order + doc type.
//

router.get("/api/v1/portal/esign", requirePortalAuth, async (req: Request, res: Response) => {
  const { order_id: orderNumber, order_type: documentType, email } = req.portalAuth!;

  try {
    const { rows } = await pool.query(
      `SELECT id, order_number, document_type, document_title, entity_name,
              document_minio_key, document_metadata, requires_perjury,
              status, signed_at
       FROM esign_records
       WHERE order_number = $1
         AND document_type = $2
         AND status IN ('pending', 'signed')
       ORDER BY created_at DESC
       LIMIT 1`,
      [orderNumber, documentType],
    );

    if (!rows.length) {
      res.status(404).json({ error: "No document found for this signing link. It may have expired." });
      return;
    }

    const rec = rows[0] as Record<string, any>;

    // Already signed — return confirmation
    if (rec.status === "signed") {
      res.json({
        already_signed: true,
        signed_at: rec.signed_at,
        document_title: rec.document_title,
        entity_name: rec.entity_name,
      });
      return;
    }

    // Get presigned URL for PDF preview
    let documentUrl: string | null = null;
    if (rec.document_minio_key) {
      documentUrl = await presignGet(rec.document_minio_key);
    }

    // Pull order number for subtitle (e.g. "CO-ABC12345")
    const metadata = rec.document_metadata || {};

    // Standard-path documents require an explicit, per-document authorization to
    // use the signer's drawn signature to complete and submit the filing. The
    // signing page surfaces and collects it BEFORE capturing the signature.
    const requireSignConsent = requiresSignConsent(metadata);

    res.json({
      document_title: rec.document_title,
      entity_name: rec.entity_name,
      order_number: rec.order_number,
      document_url: documentUrl,
      requires_perjury: rec.requires_perjury || false,
      require_sign_consent: requireSignConsent,
      sign_consent_text: requireSignConsent ? SIGN_CONSENT_TEXT : null,
      metadata,
    });
  } catch (err) {
    console.error("[portal/esign GET] Error:", err);
    res.status(500).json({ error: "Could not load document. Please try again." });
  }
});


// ── POST /api/v1/portal/esign ───────────────────────────────────────────────
//
// Body: { token, signature: { type, image_b64|name }, agreed_at, user_agent }
//

router.post("/api/v1/portal/esign", requirePortalAuth, async (req: Request, res: Response) => {
  const { order_id: orderNumber, order_type: documentType, email } = req.portalAuth!;

  const { signature, agreed_at, user_agent, sign_consent } = req.body as {
    signature?: { type: "drawn" | "typed"; image_b64?: string; name?: string; vector?: any };
    agreed_at?: string;
    user_agent?: string;
    sign_consent?: boolean;
  };

  // Validate signature
  if (!signature || !signature.type) {
    res.status(400).json({ error: "Signature is required." });
    return;
  }

  if (signature.type === "drawn") {
    if (!signature.image_b64 || signature.image_b64.length < 200) {
      res.status(400).json({ error: "Please draw your signature before submitting." });
      return;
    }
  } else if (signature.type === "typed") {
    if (!signature.name || signature.name.trim().length < 2) {
      res.status(400).json({ error: "Please type your full name." });
      return;
    }
  } else {
    res.status(400).json({ error: "Invalid signature type." });
    return;
  }

  try {
    // Find the pending record
    const { rows } = await pool.query(
      `SELECT id, order_number, document_type, status, requires_perjury,
              document_metadata, signed_at
       FROM esign_records
       WHERE order_number = $1
         AND document_type = $2
         AND status IN ('pending', 'signed')
       ORDER BY created_at DESC
       LIMIT 1`,
      [orderNumber, documentType],
    );

    if (!rows.length) {
      res.status(404).json({ error: "No document found for this signing link." });
      return;
    }

    const rec = rows[0] as Record<string, any>;

    // Idempotent — already signed
    if (rec.status === "signed") {
      res.json({ success: true, already_signed: true, signed_at: rec.signed_at });
      return;
    }

    // Signing-authorization gate: Standard-path documents require an explicit,
    // per-document authorization to use the signer's drawn signature to complete
    // and submit the filing. A typed signature is exempt.
    const requireSignConsent = requiresSignConsent(rec.document_metadata);
    if (!signConsentSatisfied(rec.document_metadata, signature.type, sign_consent)) {
      res.status(400).json({
        error: "Please confirm the authorization to use your signature to complete this filing.",
      });
      return;
    }

    // Store the signature
    const sigData = signature.type === "drawn"
      ? signature.image_b64!.replace(/^data:image\/png;base64,/, "")
      : signature.name!.trim();

    // Sanitize the optional vector (stroke paths) — bound the size so a hostile
    // client can't store an enormous JSON blob. Only kept for drawn signatures.
    let sigVector: string | null = null;
    if (signature.type === "drawn" && signature.vector && Array.isArray(signature.vector.strokes)) {
      const v = signature.vector;
      const strokeCount = v.strokes.length;
      const pointCount = v.strokes.reduce((n: number, s: any) => n + (Array.isArray(s) ? s.length : 0), 0);
      if (strokeCount > 0 && strokeCount <= 500 && pointCount > 0 && pointCount <= 20000) {
        sigVector = JSON.stringify({
          v: 1,
          w: Number(v.w) || 0,
          h: Number(v.h) || 0,
          strokes: v.strokes,
        });
      }
    }

    const clientIp = (req as any).clientIp || req.ip || "";
    const signedAt = new Date().toISOString();

    // Record the signing authorization (only meaningful when this document
    // requires it and the signer drew their signature). NB: the DB columns remain
    // named ink_consent* for migration compatibility; they store the generic
    // signing authorization.
    const signConsentGiven = requireSignConsent && signature.type === "drawn" && sign_consent === true;

    await pool.query(
      `UPDATE esign_records
       SET status = 'signed',
           signature_type = $1,
           signature_data = $2,
           signature_vector = $3,
           signer_email = $4,
           signer_ip = $5,
           signer_user_agent = $6,
           signed_at = $7,
           perjury_agreed = $8,
           ink_consent = $9,
           ink_consent_at = $10,
           ink_consent_text = $11,
           updated_at = NOW()
       WHERE id = $12`,
      [
        signature.type,
        sigData,
        sigVector,
        email,
        clientIp,
        user_agent || "",
        signedAt,
        rec.requires_perjury ? true : false,
        signConsentGiven,
        signConsentGiven ? signedAt : null,
        signConsentGiven ? SIGN_CONSENT_TEXT : null,
        rec.id,
      ],
    );

    // Notify workers to resume the pipeline
    try {
      await fetch(`${WORKER_URL}/jobs`, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          action: "esign_completed",
          order_number: orderNumber,
          document_type: documentType,
          esign_record_id: rec.id,
          signer_email: email,
        }),
      });
    } catch (dispatchErr) {
      // Non-fatal — worker will pick up on next scheduled run
      console.error("[portal/esign POST] Worker dispatch failed:", dispatchErr);
    }

    res.json({
      success: true,
      signed_at: signedAt,
      message: "Your signature has been recorded. Thank you.",
    });
  } catch (err) {
    console.error("[portal/esign POST] Error:", err);
    res.status(500).json({ error: "Could not record signature. Please try again." });
  }
});

export default router;