// Seed PocketBase with data extracted from data/source/*.json
// Regenerate those files with `node scripts/extract.mjs`
//
// Usage: PB_ADMIN=... PB_PASS=... node scripts/seed.mjs
import PocketBase from "pocketbase";
import { readFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, resolve } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const DATA_DIR = resolve(__dirname, "..", "data", "source");

// Read required env — fail loudly if missing (per Part 5.2)
const PB = process.env.NEXT_PUBLIC_PB_URL;
const EMAIL = process.env.PB_ADMIN;
const PASS = process.env.PB_PASS;
const errors = [];
if (!PB) errors.push("NEXT_PUBLIC_PB_URL");
if (!EMAIL) errors.push("PB_ADMIN");
if (!PASS) errors.push("PB_PASS");
if (errors.length) {
  console.error(`✗ Missing required env: ${errors.join(", ")}`);
  console.error("  Copy .env.example to .env.local and fill in.");
  process.exit(1);
}

const ASSETS_COLL = "assets";
const INCOME_COLL = "monthly_income";
const RUN_COLL = "monthly_running_costs";
const OVERHEADS_COLL = "overheads";

const assets = JSON.parse(readFileSync(resolve(DATA_DIR, "assets.json"), "utf8"));
const machines = JSON.parse(readFileSync(resolve(DATA_DIR, "machines.json"), "utf8"));
const mrc = JSON.parse(readFileSync(resolve(DATA_DIR, "mrc.json"), "utf8"));
const overheads = JSON.parse(readFileSync(resolve(DATA_DIR, "overheads.json"), "utf8"));

const pb = new PocketBase(PB);
pb.autoCancellation(false);

console.log(`→ Connecting to ${PB} as ${EMAIL}`);
await pb.collection("_superusers").authWithPassword(EMAIL, PASS); // Part 5.3: _superusers, not admins
console.log("  ✓ authenticated");

// Wipe existing rows so we can re-seed cleanly
for (const c of [ASSETS_COLL, INCOME_COLL, RUN_COLL, OVERHEADS_COLL]) {
  const items = await pb.collection(c).getFullList();
  for (const r of items) await pb.collection(c).delete(r.id);
}
console.log("  ✓ wiped existing rows");

// === Build alias map for code mismatches between graph sheet and asset register ===
// Per Part 1.4: derived from the workbook, not invented.
const codeAliases = {
  "428E": "TLB02",   // CAT 425F (428E) → TLB02
  "430":  "SS01",    // CASE420 (430) → first SS01 (handled below)
};
function resolveCode(graphCode, graphName) {
  if (!graphCode) return null;
  if (codeAliases[graphCode]) {
    // Special-case 430 — first match wins unless name indicates second
    if (graphCode === "430" && /SS02/i.test(graphName)) return "SS02";
    return codeAliases[graphCode];
  }
  return graphCode;
}

// === Synthesize stable codes for uncoded items (containers, generators, camps) ===
// Per Part 1.4: deterministic by normalised name. Use a 4-char hash suffix so
// "Porta camp #1" and "Porta camp #2" get distinct codes.
function normalizeName(n) {
  return String(n).toLowerCase().replace(/[^a-z0-9]+/g, "").slice(0, 12);
}
function hash4(s) {
  let h = 0;
  for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) | 0;
  return (h >>> 0).toString(36).toUpperCase().padStart(4, "0").slice(-4);
}
function syntheticCode(name) {
  return "Z" + normalizeName(name).toUpperCase().slice(0, 4) + hash4(normalizeName(name));
}

// === Insert assets ===
console.log(`\n→ Seeding ${assets.length} assets`);
const codeToId = {};
const nameToId = {};
let ok = 0;
const seedErrors = [];
for (const a of assets) {
  try {
    const rec = await pb.collection(ASSETS_COLL).create({
      code: a.code,
      name: a.name,
      category: a.category || "Plant",
      gl_account: a.gl_account || "",
      supplier: a.supplier || "",
      monthly_excl: a.monthly_excl || 0,
      monthly_incl: a.monthly_incl || 0,
      purchase_value: a.purchase_value || 0,
      // Part 1.6: site_rate dropped — it was always a copy of monthly_incl
    });
    if (a.code) codeToId[a.code] = rec.id;
    nameToId[normalizeName(a.name)] = rec.id;
    ok++;
  } catch (e) {
    seedErrors.push(`asset "${a.name}": ${e.response?.data?.message || e.message}`);
  }
}
console.log(`  ✓ ${ok}/${assets.length} assets inserted`);

// === Insert monthly_income from Machine Graph Data ===
// Part 1.5: monthly_income no longer carries running_cost — we derive it from monthly_running_costs on read.
// Part 1.4: alias map + synthetic codes for uncoded items, fail loudly on unmatched rows.
console.log("\n→ Seeding monthly_income from Machine Graph Data");
let incomeRows = 0;
const incomeErrors = [];
const lastActualMonth = (() => {
  // Last month with any recorded income across the whole workbook
  let m = 0;
  for (const x of machines) for (const d of x.data) if (d.income > 0 && d.month > m) m = d.month;
  return m;
})();
for (const m of machines) {
  const resolvedCode = resolveCode(m.code, m.machine);
  let assetId = resolvedCode ? codeToId[resolvedCode] : null;
  if (!assetId && m.machine) assetId = nameToId[normalizeName(m.machine)];
  if (!assetId) {
    // Last-resort: auto-create a synthetic asset for this machine so the income can land.
    // Per Part 1.4: deterministic by normalised name so repeat seeds are idempotent.
    const syn = syntheticCode(m.machine);
    let synId = codeToId[syn];
    if (!synId) {
      try {
        const rec = await pb.collection(ASSETS_COLL).create({
          code: syn,
          name: m.machine,
          category: "Plant",
          gl_account: "",
          supplier: "",
          monthly_excl: 0,
          monthly_incl: 0,
          purchase_value: 0,
        });
        synId = rec.id;
        codeToId[syn] = synId;
        nameToId[normalizeName(m.machine)] = synId;
        ok++;
        console.log(`  + auto-created synthetic asset ${syn} for "${m.machine}"`);
      } catch (e) {
        incomeErrors.push(`machine "${m.machine}" (code=${m.code || "—"}) — could not create synthetic asset: ${e.response?.data?.message || e.message}`);
        continue;
      }
    }
    assetId = synId;
  }
  for (const d of m.data) {
    const isForecast = d.month > lastActualMonth;
    try {
      await pb.collection(INCOME_COLL).create({
        asset: assetId,
        year: 2026,
        month: d.month,
        income: d.income,
        fixed_expenses: d.fixed_expenses,
        is_forecast: isForecast, // Part 1.2
        // running_cost removed (Part 1.5) — derived from monthly_running_costs at read time
      });
      incomeRows++;
    } catch (e) {
      incomeErrors.push(`income ${m.code || m.machine} m=${d.month}: ${e.response?.data?.message || e.message}`);
    }
  }
}
console.log(`  ✓ ${incomeRows} income rows inserted`);

// === Insert monthly_running_costs ===
console.log("\n→ Seeding monthly_running_costs");
let runRows = 0;
const runErrors = [];
for (const r of mrc) {
  let assetId = codeToId[r.code];
  if (!assetId) assetId = nameToId[normalizeName(r.name)];
  if (!assetId) { runErrors.push(`running ${r.code || r.name} m=${r.month}: no asset matched`); continue; }
  if (!r.amount) continue;
  try {
    await pb.collection(RUN_COLL).create({
      asset: assetId,
      year: 2026,
      month: r.month,
      amount: r.amount,
    });
    runRows++;
  } catch (e) {
    runErrors.push(`running ${r.code} m=${r.month}: ${e.response?.data?.message || e.message}`);
  }
}
console.log(`  ✓ ${runRows} running-cost rows inserted`);

// === Insert overheads ===
// Part 1.3: skip "Plant Overheads" — those rows are machines already in assets.
console.log("\n→ Seeding overheads (excluding Plant Overheads per Part 1.3)");
let ohRows = 0;
const ohErrors = [];
for (const o of overheads) {
  if (o.section === "Plant Overheads") continue; // Part 1.3
  try {
    await pb.collection(OVERHEADS_COLL).create({
      section: o.section,
      description: o.description,
      gl_account: o.gl_account || "",
      supplier: o.supplier || "",
      qty: o.qty || 0,
      unit_price: o.unit_price || 0,
      amount_excl: o.amount_excl || 0,
      vat: o.vat || 0,
      amount_incl: o.amount_incl || 0,
    });
    ohRows++;
  } catch (e) {
    ohErrors.push(`overhead "${o.description}": ${e.response?.data?.message || e.message}`);
  }
}
console.log(`  ✓ ${ohRows} overhead rows inserted`);

console.log("\n=== Summary ===");
console.log(`Assets: ${ok}/${assets.length}`);
console.log(`Income: ${incomeRows}`);
console.log(`Running: ${runRows}`);
console.log(`Overheads: ${ohRows}`);

const totalErrors = seedErrors.length + incomeErrors.length + runErrors.length + ohErrors.length;
if (totalErrors > 0) {
  console.error(`\n✗ ${totalErrors} errors — seed FAILED loudly:`);
  for (const e of [...seedErrors, ...incomeErrors, ...runErrors, ...ohErrors]) console.error(`  - ${e}`);
  process.exit(2);
}
console.log("\n✅ Seed complete");