/**
 * Reproduces the reported S-2026-00045 failure: three DCT->Dire container
 * bookings + one Dire->GMP container booking are allocated, but the
 * DCT->GMP 695T bulk booking is never selected even though PW2 and NW5
 * wagons are free.
 *
 * Runs the REAL planner against the REAL 42 NW5 + 10 PW2 consist, in several
 * booking orders (= different window cycles / arrival orders).
 *
 *   npx ts-node -T scripts/run-s45-scenario.ts
 */
import { DataSource } from 'typeorm';

import {
  planWagonsWithStock,
  type AllowedWagonTypeMap,
  type WagonStock,
} from '../src/modules/train-scheduling/wagon-plan-flex.util';
import { validateWagonCargoExclusivity } from '../src/modules/train-scheduling/utils/wagon-plan.util';
import type { Booking } from '../src/modules/bookings/entities/booking.entity';
import type { WagonType } from '../src/modules/wagon-types/entities/wagon-type.entity';

const YARD = {
  DCT: 'fc558b95-da28-4fc3-8348-311a290c34ae',
  DIRE: 'f7b1686f-d43e-42aa-bc6a-d3d5849296c9',
  GMP: '61ae1e66-c229-4dcd-9851-b2b9424f3a95',
};
const STOPS = [YARD.DCT, YARD.DIRE, YARD.GMP];
const NW5 = '8f717b09-eec1-46ad-be3d-2dc0a56e55e7';
const PW2 = '8eec3a7d-8482-4397-96b6-59a028210722';
const TRAIN_ID = '56eec969-55ec-4bc5-aad6-f4b7b6d17292';

const ds = new DataSource({
  type: 'postgres',
  host: process.env.DB_HOST || '10.18.7.207',
  port: Number(process.env.DB_PORT || 5432),
  database: process.env.DB_NAME || 'edr_dev',
  username: process.env.DB_USER || 'postgres',
  password: process.env.DB_PASSWORD || 'dcba@1234',
});

async function loadConfig(): Promise<{
  allowed: AllowedWagonTypeMap;
  codes: Map<string, string>;
}> {
  const types: WagonType[] = await ds.query(
    `SELECT id, code, name, capacity_tons AS "capacityTons",
            length_meters AS "lengthMeters", tare_weight_tons AS "tareWeightTons",
            supports_container AS "supportsContainer", is_active AS "isActive"
       FROM freight.wagon_types WHERE is_active IS NOT FALSE`,
  );
  const byId = new Map(types.map((t) => [t.id, t]));
  const rows = async (sql: string) => {
    const r: Array<{ typeId: string; wagonTypeId: string }> = await ds.query(sql);
    const map = new Map<string, WagonType[]>();
    for (const row of r) {
      const wt = byId.get(row.wagonTypeId);
      if (wt) map.set(row.typeId, [...(map.get(row.typeId) ?? []), wt]);
    }
    return map;
  };
  return {
    allowed: {
      byCargoTypeId: await rows(
        `SELECT cargo_type_id AS "typeId", wagon_type_id AS "wagonTypeId" FROM freight.cargo_type_wagon_types`),
      byContainerTypeId: await rows(
        `SELECT container_type_id AS "typeId", wagon_type_id AS "wagonTypeId" FROM freight.container_type_wagon_types`),
    },
    codes: new Map(types.map((t) => [t.id, t.code])),
  };
}

async function loadBookings(allowed: AllowedWagonTypeMap): Promise<Map<string, Booking>> {
  const rows = await ds.query(
    `SELECT b.id, b.reference, b.freight_type AS "freightType",
            b.cargo_total_weight_vgm AS "cargoTotalWeightVgm",
            b.bulk_total_weight_tons AS "bulkTotalWeightTons",
            b.cargo_type_id AS "cargoTypeId", b.origin_yard_id AS "originYardId",
            b.destination_yard_id AS "destinationYardId",
            b.is_government AS "isGovernment", b.priority_score AS "priorityScore",
            b.status, b.payment_status AS "paymentStatus",
            b.created_at AS "createdAt"
       FROM freight.bookings b
      WHERE b.reference LIKE 'SF45-%' AND b.deleted_at IS NULL`);
  const cargo = await ds.query(
    `SELECT id, cargo_type_name AS "cargoTypeName", code,
            unit_of_measure AS "unitOfMeasure",
            tons_per_wagon_map AS "tonsPerWagonMap",
            items_per_wagon_map AS "itemsPerWagonMap" FROM freight.cargo_types`);
  const cargoById = new Map(cargo.map((c: any) => [c.id, c]));
  const lines = await ds.query(
    `SELECT bc.id, bc.booking_id AS "bookingId", bc.container_type_id AS "containerTypeId",
            bc.quantity, bc.vgm_per_unit_tons AS "vgmPerUnitTons",
            bc.wagons_required AS "wagonsRequired", ct.code, ct.size_ft AS "sizeFt"
       FROM freight.booking_container bc
       JOIN freight.container_types ct ON ct.id = bc.container_type_id
      WHERE bc.booking_id = ANY($1) AND bc.deleted_at IS NULL`,
    [rows.map((r: any) => r.id)]);

  return new Map(rows.map((r: any) => {
    const ct = r.cargoTypeId ? cargoById.get(r.cargoTypeId) : null;
    return [r.reference, {
      ...r,
      cargoType: ct
        ? { ...ct, wagonTypes: allowed.byCargoTypeId.get(r.cargoTypeId) ?? [] }
        : null,
      bookingContainers: lines.filter((l: any) => l.bookingId === r.id).map((l: any) => ({
        ...l,
        containerType: { id: l.containerTypeId, code: l.code, sizeFt: l.sizeFt },
        units: [],
      })),
    } as unknown as Booking];
  }));
}

/** The train's real consist, as TRAIN-mode stock. */
async function consistStock(codes: Map<string, string>): Promise<WagonStock> {
  const rows = await ds.query(
    `SELECT wagon_type_id AS "wagonTypeId", count(*)::int AS n
       FROM freight.wagons
      WHERE train_id = $1 AND deleted_at IS NULL
      GROUP BY wagon_type_id`, [TRAIN_ID]);
  return {
    mode: 'TRAIN',
    remainingByTypeId: new Map(rows.map((r: any) => [r.wagonTypeId, r.n])),
    codesByTypeId: codes,
  };
}

const planByType = (plan: any[]) => {
  const c = new Map<string, number>();
  for (const s of plan) c.set(s.wagonTypeCode, (c.get(s.wagonTypeCode) ?? 0) + 1);
  return [...c.entries()].map(([k, n]) => `${n}x ${k}`).join(', ') || 'none';
};

/** Gross tons riding each corridor edge — the locomotive pull check. */
const perEdgeGross = (plan: any[], legs: Map<string, { from: number; to: number }>) => {
  const edges = [0, 0];
  for (const slot of plan) {
    const spans = slot.allocations.map((a: any) => legs.get(a.bookingId) ?? { from: 0, to: 2 });
    const from = Math.min(...spans.map((s: any) => s.from));
    const to = Math.max(...spans.map((s: any) => s.to));
    for (let e = from; e < to; e += 1) {
      edges[e] += Number(slot.tareWeightTons) + Number(slot.assignedWeightTons);
    }
  }
  return edges.map((t) => Math.round(t));
};

async function main() {
  await ds.initialize();
  const { allowed, codes } = await loadConfig();
  const byRef = await loadBookings(allowed);
  const stock = await consistStock(codes);

  console.log('\n=== S-2026-00045 CONSIST (real) ===');
  console.table([...stock.remainingByTypeId.entries()].map(([id, n]) => ({
    wagonType: codes.get(id), wagons: n })));
  console.log('Route: DCT -> DIRE_DAWA -> GMP (2 edges)   Loco pull: 3500T / 1520m\n');

  const ORDERS: Array<{ name: string; refs: string[] }> = [
    { name: '1. STAGING ORDER (containers first, bulk last)',
      refs: ['SF45-5', 'SF45-3', 'SF45-2', 'SF45-1', 'SF45-4'] },
    { name: '2. BULK FIRST (bulk books earliest window)',
      refs: ['SF45-4', 'SF45-1', 'SF45-2', 'SF45-3', 'SF45-5'] },
    { name: '3. BULK IN THE MIDDLE',
      refs: ['SF45-1', 'SF45-2', 'SF45-4', 'SF45-3', 'SF45-5'] },
    { name: '4. SEQUENTIAL (as listed by the user)',
      refs: ['SF45-1', 'SF45-2', 'SF45-3', 'SF45-4', 'SF45-5'] },
    { name: '5. BULK ONLY (nothing competing)',
      refs: ['SF45-4'] },
    { name: '6. BULK + the Dire->GMP leg only',
      refs: ['SF45-5', 'SF45-4'] },
  ];

  const summary: Array<Record<string, unknown>> = [];
  // Second pass models the staging reality: the bulk booking is PAID (the
  // customer's money is already taken) while the containers are not.
  const PAID_BULK = process.env.PAID_BULK === '1';

  for (const order of ORDERS) {
    const bookings = order.refs.map((r) => {
      const b = byRef.get(r)!;
      if (!b) return b;
      return PAID_BULK && r === 'SF45-4'
        ? ({ ...b, status: 'PAID', paymentStatus: 'PAID' } as Booking)
        : b;
    }).filter(Boolean);
    const legs = new Map(bookings.map((b: any) => [
      b.id,
      { from: STOPS.indexOf(b.originYardId), to: STOPS.indexOf(b.destinationYardId) },
    ]));
    const result = planWagonsWithStock({
      bookings, allowed,
      stock: {
        ...stock,
        remainingByTypeId: new Map(stock.remainingByTypeId),
      },
      legs, edgeCount: 2, stops: STOPS,
    });

    const refOf = (id: string) =>
      bookings.find((b: any) => b.id === id)?.reference ?? id;
    const bulkFitted = result.fitting.some((b) => b.reference === 'SF45-4');
    const bulkDeferred = result.deferred.find((d) => d.reference === 'SF45-4');
    const gross = perEdgeGross(result.plan, legs);
    const excl = validateWagonCargoExclusivity(result.plan, legs, 2);

    console.log(`\n──────── ${order.name} ────────`);
    console.log(`order: ${order.refs.join(' -> ')}`);
    console.log(`plan: ${result.plan.length} wagons — ${planByType(result.plan)}`);
    console.log(`gross per edge: DCT->Dire ${gross[0]}T | Dire->GMP ${gross[1]}T  (limit 3500T)`);
    console.log(`fitting:  ${result.fitting.map((b) => b.reference).join(', ') || 'none'}`);
    for (const d of result.deferred) console.log(`DEFERRED: ${d.reference} — ${d.reason}`);
    if (excl.length) console.log(`EXCLUSIVITY VIOLATION: ${excl.join('; ')}`);
    const bulkSlots = result.plan.filter((s) =>
      s.allocations.some((a) => refOf(a.bookingId) === 'SF45-4'));
    if (bulkSlots.length) {
      console.log(`  bulk seated on: ${planByType(bulkSlots)}`);
    }

    summary.push({
      order: order.name.slice(0, 34),
      wagons: result.plan.length,
      'bulk SF45-4': bulkFitted ? 'SELECTED' : 'NOT SELECTED',
      deferred: result.deferred.map((d) => d.reference).join(',') || '-',
      reason: bulkDeferred ? bulkDeferred.reason.slice(0, 60) : '-',
    });
  }

  console.log('\n\n================ SUMMARY ================');
  console.table(summary);
  await ds.destroy();
}

main().catch((e) => { console.error(e); process.exit(1); });