/**
 * Migration — 2026-07-19-create-delivery-notes.ts
 *
 * Creates the delivery-notes schema that the Invoicing flow needs to
 * back the "delivery note → quote → invoice" lifecycle.
 *
 * ## Background — why this exists
 *
 * Two flows collapse into one "delivery note" concept:
 *
 *   Path A (supplier → shop → customer)
 *     1. Customer's items get ordered from a supplier, no customer PO
 *        yet. Items arrive in the shop.
 *     2. Office creates a delivery note — the items are held for that
 *        customer. The `order_items` rows already exist (from the
 *        supplier PO); the delivery note is just a header that groups
 *        them via `delivery_note_number` on each `order_items` row.
 *     3. Office creates a Quote with status=`delivery_note` (the
 *        "delivery-note pricing" status). Operator fills in prices.
 *     4. Quote is sent to the customer with the delivery note.
 *     5. Customer sends back their PO → stamped on the delivery note
 *        (`customer_po` field), status flips to `po_received`.
 *     6. Office creates the invoice from the quote + delivery note.
 *     7. Status flips to `invoiced` → `completed`.
 *
 *   Path B (counter pickup)
 *     1. Customer comes to the counter, takes items from stock.
 *     2. Office creates a delivery note on the spot. New `order_items`
 *        rows are created on the fly and stamped with the
 *        `delivery_note_number` — same end state as Path A.
 *     3. The Quote + PO + Invoice flow is identical.
 *
 * ## Why one collection, no items collection
 *
 * Items live on `order_items` (which already has a `delivery_note_number`
 * field — see schema). A delivery note is a header; its lines are
 * `order_items` rows where `delivery_note_number = X`. No second
 * `delivery_note_items` collection — the string join is enough and
 * avoids a sync problem (each item would have to exist in two
 * collections at once).
 *
 * ## What this script does
 *
 * 1. Creates the `delivery_notes` collection.
 *    - `delivery_note_number` — text, unique-indexed, the human-readable
 *      identifier. Format `DN{YY}{MM}{DD}{NN}` (server-generated, daily
 *      sequence), generated by the delivery-note API route.
 *    - `customer`, `company` — relations to the customer / company.
 *      Both optional: an ad-hoc delivery note (Path B counter pickup
 *      with a brand-new customer) may have neither until the operator
 *      picks one.
 *    - `order` — relation to `orders`, OPTIONAL. Set when all the
 *      `order_items` rows belong to a single order (the common case
 *      in Path A). Null when items span multiple orders, or when there
 *      is no order at all (Path B).
 *    - `status` — select: `draft`, `sent`, `po_received`, `invoiced`,
 *      `completed`, `cancelled`. Lifecycle in the comment block above.
 *    - `delivery_date` — date the items were (or will be) delivered.
 *      Optional because ad-hoc delivery notes can be created in
 *      advance and the actual delivery might happen later.
 *    - `customer_po` — text. The customer's PO number, filled in when
 *      the customer sends their PO. Drives the transition to
 *      `po_received` (via the API route, not enforced here).
 *    - `notes` — free text.
 *    - `created_by` — relation to users. Captures who triggered the
 *      delivery note (the operator who hit "mark as delivery note" in
 *      Invoicing, or the operator who created an ad-hoc one).
 *    - Standard `id`, `created`, `updated`.
 *
 * 2. Reconciles `quotes.status.values` to add `delivery_note`. The
 *    value is the "this quote is pricing a delivery note" status;
 *    quotes with this status live in a separate tab on the Quotes page
 *    (or get filtered into the "delivery_note" view).
 *
 * 3. Adds `delivery_note` (relation → `delivery_notes`, optional) to
 *    the `quotes` collection. Lets a quote navigate back to the
 *    delivery note it prices.
 *
 * Idempotent — safe to re-run. Will skip collections/fields that
 * already exist with the expected shape.
 *
 * Run with:
 *   npx tsx scripts/migrations/2026-07-19-create-delivery-notes.ts
 */
import PocketBase from "pocketbase";
import { readFileSync } from "node:fs";
import { resolve } from "node:path";

function loadEnvFile(name: string) {
  try {
    const raw = readFileSync(resolve(process.cwd(), name), "utf8");
    for (const line of raw.split("\n")) {
      const trimmed = line.trim();
      if (!trimmed || trimmed.startsWith("#")) continue;
      const m = trimmed.match(/^([A-Z0-9_]+)\s*=\s*(.+)$/i);
      if (m && !process.env[m[1]]) {
        process.env[m[1]] = m[2].replace(/^["']|["']$/g, "").trim();
      }
    }
  } catch {
    /* fine — rely on shell env */
  }
}
loadEnvFile(".env");
loadEnvFile(".env.local");

function getAdminPocketBase(): PocketBase {
  const url = process.env.NEXT_PUBLIC_POCKETBASE_URL;
  const email = process.env.PB_ADMIN_EMAIL;
  const password = process.env.PB_ADMIN_PASSWORD;
  if (!url || !email || !password) {
    throw new Error(
      "Set NEXT_PUBLIC_POCKETBASE_URL, PB_ADMIN_EMAIL, PB_ADMIN_PASSWORD (sourced from .env.local).",
    );
  }
  const pb = new PocketBase(url);
  return pb;
}

async function authedPb(): Promise<PocketBase> {
  const pb = getAdminPocketBase();
  await pb
    .collection("_superusers")
    .authWithPassword(
      process.env.PB_ADMIN_EMAIL!,
      process.env.PB_ADMIN_PASSWORD!,
    );
  return pb;
}

const DELIVERY_NOTES = "delivery_notes";
const CUSTOMERS = "customers";
const COMPANIES = "companies";
const ORDERS = "orders";
const USERS = "users";
const QUOTES = "quotes";
const ORDER_ITEMS = "order_items";

const DELIVERY_NOTE_STATUS_VALUES = [
  "draft",
  "sent",
  "po_received",
  "invoiced",
  "completed",
  "cancelled",
];

const TARGET_QUOTE_STATUS_VALUES = [
  "new",
  "claimed",
  "processed",
  "emailed",
  "approval_pending",
  "approved",
  "rejected",
  "problem",
  "complete",
  "cancelled",
  "follow_up",
  "email_failed",
  "unmatched_bounce",
  "template",
  "sending",
  "mail_failed",
  "delivery_note", // ← new — this quote is pricing a delivery note
];

export async function run(): Promise<void> {
  const pb = await authedPb();

  // ── 0. Resolve relation targets ─────────────────────────────────
  const customersCol = await pb.collections.getOne(CUSTOMERS);
  const companiesCol = await pb.collections.getOne(COMPANIES);
  const ordersCol = await pb.collections.getOne(ORDERS);
  const usersCol = await pb.collections.getOne(USERS);

  // ── 1. Create `delivery_notes` if missing, or patch missing fields
  let deliveryNotesCol: { id: string };
  const existing = await pb.collections.getList(1, 1, {
    filter: `name = "${DELIVERY_NOTES}"`,
  });

  const targetFields = [
    {
      name: "created",
      type: "autodate",
      required: true,
      onCreate: true,
      onUpdate: false,
    },
    {
      name: "updated",
      type: "autodate",
      required: true,
      onCreate: true,
      onUpdate: true,
    },
    {
      // Text fields: PB stores max/min/pattern as top-level
      // properties (NOT nested under `options`). The
      // `options` wrapper is for legacy / schema-export JSON,
      // not for create. Using `options` returns a generic
      // 400 "values: Cannot be blank" which is the same error
      // a mis-shaped select field produces.
      name: "delivery_note_number",
      type: "text",
      required: true,
      max: 50,
      min: 1,
      pattern: "",
    },
    {
      name: "customer",
      type: "relation",
      required: false,
      collectionId: customersCol.id,
      cascadeDelete: false,
      maxSelect: 1,
    },
    {
      name: "company",
      type: "relation",
      required: false,
      collectionId: companiesCol.id,
      cascadeDelete: false,
      maxSelect: 1,
    },
    {
      name: "order",
      type: "relation",
      required: false,
      collectionId: ordersCol.id,
      cascadeDelete: false,
      maxSelect: 1,
    },
    {
      // Select fields: PB stores maxSelect and values as
      // top-level properties (NOT nested under `options`).
      // Verified by querying existing `item_status` on
      // order_items + `status` on quotes.
      name: "status",
      type: "select",
      required: true,
      maxSelect: 1,
      values: DELIVERY_NOTE_STATUS_VALUES,
    },
    {
      name: "delivery_date",
      type: "date",
      required: false,
    },
    {
      name: "customer_po",
      type: "text",
      required: false,
      max: 100,
    },
    {
      name: "notes",
      type: "text",
      required: false,
      max: 5000,
    },
    {
      name: "created_by",
      type: "relation",
      required: false,
      collectionId: usersCol.id,
      cascadeDelete: false,
      maxSelect: 1,
    },
  ];

  if (existing.items.length === 0) {
    try {
      deliveryNotesCol = await pb.collections.create({
        name: DELIVERY_NOTES,
        type: "base",
        fields: targetFields,
        indexes: [
          "CREATE UNIQUE INDEX idx_delivery_notes_number ON delivery_notes (delivery_note_number)",
          "CREATE INDEX idx_delivery_notes_customer ON delivery_notes (customer)",
          "CREATE INDEX idx_delivery_notes_order ON delivery_notes (order)",
          "CREATE INDEX idx_delivery_notes_status ON delivery_notes (status)",
        ],
        listRule: "@request.auth.id != ''",
        viewRule: "@request.auth.id != ''",
        createRule: "@request.auth.id != ''",
        updateRule: "@request.auth.id != ''",
        deleteRule: "@request.auth.id != ''",
      });
      console.log(
        `[migration:create-delivery-notes] ✓ created ${DELIVERY_NOTES} (${deliveryNotesCol.id})`,
      );
    } catch (createErr: unknown) {
      // PB returns a generic "Failed to create collection." on any
      // field validation error and buries the per-field reason in
      // `data.fields` or `response.data`. Dump the whole thing so
      // future debugging doesn't have to re-discover this.
      const e = createErr as {
        response?: { data?: unknown };
        originalError?: { data?: unknown };
        data?: unknown;
        message?: string;
      };
      console.error(
        "[migration:create-delivery-notes] PB rejected the collection create. Full error:",
        JSON.stringify(
          {
            message: e.message,
            responseData: e.response?.data ?? e.originalError?.data ?? e.data,
          },
          null,
          2,
        ),
      );
      throw createErr;
    }
  } else {
    deliveryNotesCol = existing.items[0];
    // Patch any missing fields (e.g. partial schema from a prior dev
    // run, or the old status enum values from the previous version of
    // this collection).
    const existingFields = (deliveryNotesCol as unknown as {
      fields: Array<{ name: string; values?: string[] }>;
    }).fields;
    const haveNames = new Set(existingFields.map((f) => f.name));
    const missing = targetFields.filter((f) => !haveNames.has(f.name));
    let next = existingFields as Array<Record<string, unknown>>;
    let statusReconciled = false;
    if (missing.length > 0) {
      next = [...next, ...missing];
    }
    // Always reconcile the status select values — replaces any old
    // (`ready`, `delivered`, `cancelled`) enum with the new lifecycle.
    // PB stores select values as a top-level `values` array on the
    // field, not nested under `options` — see the gotcha note at the
    // top of the file. The `options` wrapper shape returns a generic
    // 400 on create AND silently no-ops on update, so we set the flat
    // shape explicitly.
    next = next.map((f) => {
      if (f.name === "status" && f.type === "select") {
        statusReconciled = true;
        return { ...f, values: DELIVERY_NOTE_STATUS_VALUES };
      }
      return f;
    });
    if (missing.length > 0 || statusReconciled) {
      await pb.collections.update(DELIVERY_NOTES, { fields: next });
      console.log(
        `[migration:create-delivery-notes] ✓ patched ${DELIVERY_NOTES} (added ${missing.length} field(s)${statusReconciled ? ", reconciled status enum" : ""})`,
      );
    } else {
      console.log(
        `[migration:create-delivery-notes] ${DELIVERY_NOTES} already exists (${deliveryNotesCol.id}) with all expected fields — skip`,
      );
    }
  }

  // ── 2. Reconcile `quotes.status.values` to add `delivery_note` ───
  const quotesCol = await pb.collections.getOne(QUOTES);
  const qFields = (quotesCol.fields ?? []) as Array<{
    name?: string;
    values?: string[];
  }>;
  let qSchemaChanged = false;
  for (const f of qFields) {
    if (f.name !== "status") continue;
    const current = new Set(f.values ?? []);
    const target = new Set(TARGET_QUOTE_STATUS_VALUES);
    const needsAdd = [...target].some((v) => !current.has(v));
    if (needsAdd) {
      f.values = [...target];
      qSchemaChanged = true;
    }
    break;
  }
  if (qSchemaChanged) {
    await pb.collections.update(QUOTES, { fields: qFields });
    console.log(
      `[migration:create-delivery-notes] ✓ added delivery_note to quotes.status.values`,
    );
  } else {
    console.log(
      "[migration:create-delivery-notes] quotes.status already includes delivery_note — skip",
    );
  }

  // ── 2b. Reconcile `order_items.item_status.values` ────────────────
  // The Invoicing flow PATCHes `item_status = "delivery_note"` on
  // every order_item when the operator clicks "Create delivery note".
  // If "delivery_note" isn't in the select enum yet, PB rejects the
  // PATCH with the generic 400 "Failed to update record." and the
  // route 500s. This step makes sure the value is in the enum.
  //
  // We don't replace the full enum (that would conflict with the
  // create-stock migration's reconcile). We just union the new
  // value into whatever's already there.
  const orderItemsCol = await pb.collections.getOne(ORDER_ITEMS);
  const oiFields = (orderItemsCol.fields ?? []) as Array<{
    name?: string;
    values?: string[];
  }>;
  let oiSchemaChanged = false;
  for (const f of oiFields) {
    if (f.name !== "item_status") continue;
    const current = new Set(f.values ?? []);
    if (!current.has("delivery_note")) {
      f.values = [...(f.values ?? []), "delivery_note"];
      oiSchemaChanged = true;
    }
    break;
  }
  if (oiSchemaChanged) {
    await pb.collections.update(ORDER_ITEMS, { fields: oiFields });
    console.log(
      "[migration:create-delivery-notes] ✓ added delivery_note to order_items.item_status.values",
    );
  } else {
    console.log(
      "[migration:create-delivery-notes] order_items.item_status already includes delivery_note — skip",
    );
  }

  // ── 3. Add `delivery_note` (relation → delivery_notes) to `quotes`
  const qHasDeliveryNoteField = (qFields as Array<{ name: string }>).some(
    (f) => f.name === "delivery_note",
  );
  if (!qHasDeliveryNoteField) {
    const nextQ = [
      ...(quotesCol.fields ?? []),
      {
        name: "delivery_note",
        type: "relation",
        required: false,
        collectionId: deliveryNotesCol.id,
        cascadeDelete: false,
        maxSelect: 1,
      },
    ];
    await pb.collections.update(QUOTES, { fields: nextQ });
    console.log(
      "[migration:create-delivery-notes] ✓ added delivery_note relation to quotes",
    );
  } else {
    console.log(
      "[migration:create-delivery-notes] quotes.delivery_note relation already present — skip",
    );
  }

  // ── 4. Verify ───────────────────────────────────────────────────
  const vDn = await pb.collections.getOne(DELIVERY_NOTES);
  const vQ = await pb.collections.getOne(QUOTES);
  const vOi = await pb.collections.getOne(ORDER_ITEMS);

  const dnFieldNames = (vDn.fields as Array<{ name: string }>).map(
    (f) => f.name,
  );
  const dnStatusValues = (
    (vDn.fields as Array<{ name: string; values?: string[] }>).find(
      (f) => f.name === "status",
    )?.values ?? []
  );
  const qFieldNames = (vQ.fields as Array<{ name: string }>).map(
    (f) => f.name,
  );
  const qStatusValues = (
    (vQ.fields as Array<{ name: string; values?: string[] }>).find(
      (f) => f.name === "status",
    )?.values ?? []
  );
  const oiItemStatusValues = (
    (vOi.fields as Array<{ name: string; values?: string[] }>).find(
      (f) => f.name === "item_status",
    )?.values ?? []
  );

  const checks: Array<[string, boolean]> = [
    ["delivery_notes collection exists", dnFieldNames.length > 0],
    [
      "delivery_notes.delivery_note_number exists",
      dnFieldNames.includes("delivery_note_number"),
    ],
    ["delivery_notes.customer exists", dnFieldNames.includes("customer")],
    ["delivery_notes.company exists", dnFieldNames.includes("company")],
    ["delivery_notes.order exists", dnFieldNames.includes("order")],
    ["delivery_notes.status exists", dnFieldNames.includes("status")],
    [
      "delivery_notes.status includes draft",
      dnStatusValues.includes("draft"),
    ],
    [
      "delivery_notes.status includes sent",
      dnStatusValues.includes("sent"),
    ],
    [
      "delivery_notes.status includes po_received",
      dnStatusValues.includes("po_received"),
    ],
    [
      "delivery_notes.status includes invoiced",
      dnStatusValues.includes("invoiced"),
    ],
    [
      "delivery_notes.status includes completed",
      dnStatusValues.includes("completed"),
    ],
    [
      "delivery_notes.status includes cancelled",
      dnStatusValues.includes("cancelled"),
    ],
    [
      "delivery_notes.delivery_date exists",
      dnFieldNames.includes("delivery_date"),
    ],
    [
      "delivery_notes.customer_po exists",
      dnFieldNames.includes("customer_po"),
    ],
    [
      "delivery_notes.notes exists",
      dnFieldNames.includes("notes"),
    ],
    [
      "delivery_notes.created_by exists",
      dnFieldNames.includes("created_by"),
    ],
    [
      "quotes.status includes delivery_note",
      qStatusValues.includes("delivery_note"),
    ],
    [
      "quotes.delivery_note relation exists",
      qFieldNames.includes("delivery_note"),
    ],
    // The Invoicing flow PATCHes item_status = "delivery_note" on
    // every order_item — if this value isn't in the enum, the PATCH
    // 400s and the whole delivery-note creation 500s. This check
    // makes the "did we add it?" question explicit in the verify
    // output.
    [
      "order_items.item_status includes delivery_note",
      oiItemStatusValues.includes("delivery_note"),
    ],
  ];

  let allOk = true;
  for (const [label, ok] of checks) {
    console.log(`  ${ok ? "✓" : "✗"} ${label}`);
    if (!ok) allOk = false;
  }

  if (!allOk) {
    throw new Error(
      "[migration:create-delivery-notes] verification failed — see ✗ lines above",
    );
  }
  console.log("[migration:create-delivery-notes] Migration complete.");
}

if (require.main === module) {
  run().catch((err) => {
    console.error("[migration:create-delivery-notes] fatal:", err);
    process.exit(1);
  });
}