# 09 — Vendor Spec (BOM Import)

## Overview

The vendor spec feature allows importing a vendor BOM (Bill of Materials) into a configuration. It maps vendor part numbers (PN) to internal LOT names using an active partnumber book (snapshot pulled from PriceForge), then aggregates quantities to populate the Estimate (cart).

---

## Architecture

### Storage

| Data | Storage | Sync direction |
|------|---------|---------------|
| `vendor_spec` JSON | `local_configurations.vendor_spec` (TEXT, JSON-encoded) | Two-way via `pending_changes` |
| Partnumber book snapshots | `local_partnumber_books` + `local_partnumber_book_items` | Pull-only from PriceForge |

`vendor_spec` is a JSON array of `VendorSpecItem` objects stored inside the configuration row. It syncs to MariaDB `qt_configurations.vendor_spec` via the existing pending_changes mechanism.

### `vendor_spec` JSON Schema

```json
[
  {
    "sort_order": 10,
    "vendor_partnumber": "ABC-123",
    "quantity": 2,
    "description": "...",
    "unit_price": 4500.00,
    "total_price": 9000.00,
    "lot_mappings": [
      { "lot_name": "LOT_A", "quantity_per_pn": 1 },
      { "lot_name": "LOT_B", "quantity_per_pn": 2 }
    ]
  }
]
```

`lot_mappings[]` is the canonical persisted LOT mapping list for a BOM row.
Each mapping entry stores:

- `lot_name`
- `quantity_per_pn` (how many units of this LOT are included in **one vendor PN**)

### PN → LOT Mapping Contract (single LOT, multiplier, bundle)

QuoteForge expects the server to return/store BOM rows (`vendor_spec`) using a single canonical mapping list:

- `lot_mappings[]` contains **all** LOT mappings for the PN row (single LOT and bundle cases alike)
- the list stores exactly what the user sees in BOM (LOT + "LOT в 1 PN")
- the DB contract does **not** split mappings into "base LOT" vs "bundle LOTs"

#### Final quantity contribution to Estimate

For one BOM row with vendor PN quantity `pn_qty`:

- each mapping contribution:
  - `lot_qty = pn_qty * lot_mappings[i].quantity_per_pn`

#### Example: one PN maps to multiple LOTs

```json
{
  "vendor_partnumber": "SYS-821GE-TNHR",
  "quantity": 3,
  "lot_mappings": [
    { "lot_name": "CHASSIS_X13_8GPU", "quantity_per_pn": 1 },
    { "lot_name": "PS_3000W_Titanium", "quantity_per_pn": 2 },
    { "lot_name": "RAILKIT_X13", "quantity_per_pn": 1 }
  ]
}
```

This row contributes to Estimate:

- `CHASSIS_X13_8GPU` → `3 * 1 = 3`
- `PS_3000W_Titanium` → `3 * 2 = 6`
- `RAILKIT_X13` → `3 * 1 = 3`

---

## Partnumber Books (Snapshots)

Partnumber books are immutable versioned snapshots of the global PN→LOT mapping table, analogous to pricelists. PriceForge creates new snapshots; QuoteForge only pulls and reads them.

### SQLite (local mirror)

```sql
CREATE TABLE local_partnumber_books (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    server_id  INTEGER UNIQUE NOT NULL,   -- id from qt_partnumber_books
    version    TEXT    NOT NULL,          -- format YYYY-MM-DD-NNN
    created_at DATETIME NOT NULL,
    is_active  INTEGER NOT NULL DEFAULT 1
);

CREATE TABLE local_partnumber_book_items (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    book_id       INTEGER NOT NULL,      -- FK → local_partnumber_books.id
    partnumber    TEXT    NOT NULL,
    lot_name      TEXT    NOT NULL,
    is_primary_pn INTEGER NOT NULL DEFAULT 0,
    description   TEXT
);
CREATE INDEX idx_local_book_pn ON local_partnumber_book_items(book_id, partnumber);
```

**Active book query:** `WHERE is_active=1 ORDER BY created_at DESC, id DESC LIMIT 1`

**Schema creation:** GORM AutoMigrate (not `runLocalMigrations`).

### MariaDB (managed exclusively by PriceForge)

```sql
CREATE TABLE qt_partnumber_books (
    id         INT AUTO_INCREMENT PRIMARY KEY,
    version    VARCHAR(50)  NOT NULL,
    created_at DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP,
    is_active  TINYINT(1)   NOT NULL DEFAULT 1
);

CREATE TABLE qt_partnumber_book_items (
    id            INT AUTO_INCREMENT PRIMARY KEY,
    book_id       INT          NOT NULL,
    partnumber    VARCHAR(255) NOT NULL,
    lot_name      VARCHAR(255) NOT NULL,
    is_primary_pn TINYINT(1)   NOT NULL DEFAULT 0,
    description   VARCHAR(10000) NULL,
    INDEX idx_book_pn (book_id, partnumber),
    FOREIGN KEY (book_id) REFERENCES qt_partnumber_books(id)
);

ALTER TABLE qt_configurations ADD COLUMN vendor_spec JSON NULL;
```

QuoteForge has `SELECT` permission only on `qt_partnumber_books` and `qt_partnumber_book_items`. All writes are managed by PriceForge.

**Grant (add to existing user setup):**
```sql
GRANT SELECT ON RFQ_LOG.qt_partnumber_books TO '<DB_USER>'@'%';
GRANT SELECT ON RFQ_LOG.qt_partnumber_book_items TO '<DB_USER>'@'%';
```

### `is_primary_pn` semantics

- `1` = primary PN for this `lot_name`. Its quantity in the vendor BOM determines `qty(LOT)`.
- `0` = non-primary (trigger) PN. If no primary PN for the LOT is found in BOM, contributes `qty=1`.

---

## Resolution Algorithm (3-step)

For each `vendor_partnumber` in the BOM, QuoteForge builds/updates UI-visible LOT mappings:

1. **Active book lookup** — query `local_partnumber_book_items WHERE book_id = activeBook.id AND partnumber = ?`.
2. **Populate BOM UI** — if a match exists, BOM row shows a LOT value (user can still edit it).
3. **Unresolved** — red row + inline LOT input with strict autocomplete.

Persistence note: the application stores the final user-visible mappings in `lot_mappings[]` (not separate "resolved/manual" persisted fields).

---

## Qty Aggregation Logic

After resolution, qty per LOT is computed as:

```
qty(lot) = SUM(quantity of rows where is_primary_pn=1 AND resolved_lot=lot)
           if at least one primary PN for this lot was found in BOM
         = 1
           if only non-primary PNs for this lot were found
```

Examples (book: LOT_A → x1[primary], x2, x3):
- BOM: x2×1, x3×2 → 1×LOT_A (no primary PN)
- BOM: x1×2, x2×1 → 2×LOT_A (primary qty=2)
- BOM: x1×1, x2×3 → 1×LOT_A (primary qty=1)

---

## UI: Three Top-Level Tabs

The configurator (`/configurator`) has three tabs:

1. **Estimate** — existing cart/component configurator (unchanged).
2. **BOM** — paste/import vendor BOM, manual column mapping, LOT matching, bundle decomposition (`1 PN -> multiple LOTs`), "Пересчитать эстимейт", "Очистить".
3. **Ценообразование** — pricing summary table + custom price input.

BOM data is shared between tabs 2 and 3.

### BOM Import UI (raw table, manual column mapping)

After paste (`Ctrl+V`) QuoteForge renders an editable raw table (not auto-detected parsing).

- The pasted rows are shown **as-is** (including header rows, if present).
- The user selects a type for each column manually:
  - `P/N`
  - `Кол-во`
  - `Цена`
  - `Описание`
  - `Не использовать`
- Required mapping:
  - exactly one `P/N`
  - exactly one `Кол-во`
- Optional mapping:
  - `Цена` (0..1)
  - `Описание` (0..1)
- Rows can be:
  - ignored (UI-only, excluded from `vendor_spec`)
  - deleted
- Raw cells are editable inline after paste.

Notes:
- There is **no auto column detection**.
- There is **no auto header-row skip**.
- Raw import layout itself is not stored on server; only normalized `vendor_spec` is stored.

### LOT matching in BOM table

The BOM table adds service columns on the right:

- `LOT`
- `LOT в 1 PN`
- actions (`+`, ignore, delete)

`LOT` behavior:
- The first LOT row shown in the BOM UI is the primary LOT mapping for the PN row.
- Additional LOT rows are added via the `+` action.
- inline LOT input is strict:
  - autocomplete source = full local components list (`/api/components?per_page=5000`)
  - free text that does not match an existing LOT is rejected

`LOT в 1 PN` behavior:
- quantity multiplier for each visible LOT row in BOM (`quantity_per_pn` in persisted `lot_mappings[]`)
- default = `1`
- editable inline

### Bundle mode (`1 PN -> multiple LOTs`)

The `+` action in BOM rows adds an extra LOT mapping row for the same vendor PN row.

- All visible LOT rows (first + added rows) are persisted uniformly in `lot_mappings[]`
- Each mapping row has:
  - LOT
  - qty (`LOT in 1 PN` = `quantity_per_pn`)

### BOM restore on config open

On config open, QuoteForge loads `vendor_spec` from server and reconstructs the editable BOM table in normalized form:

- columns restored as: `Qty | P/N | Description | Price`
- column mapping restored as:
  - `qty`, `pn`, `description`, `price`
- LOT / `LOT в 1 PN` rows are restored from `vendor_spec.lot_mappings[]`

This restores the BOM editing state, but not the original raw Excel layout (extra columns, ignored rows, original headers).

### Pricing Tab: column order

```
LOT | PN вендора | Описание | Кол-во | Estimate | Цена вендора | Склад | Конк.
```

**If BOM is empty** — the pricing tab still renders, using cart items as rows (PN вендора = "—", Цена вендора = "—").

**Description source priority:** BOM row description → LOT description from `local_components`.

### Pricing Tab: BOM + Estimate merge behavior

When BOM exists, the pricing tab renders:

- BOM-based rows (including rows resolved via manual LOT and bundle mappings)
- plus **Estimate-only LOTs** (rows currently in cart but not covered by BOM mappings)

Estimate-only rows are shown as separate rows with:
- `PN вендора = "—"`
- vendor price = `—`
- description from local components

### Pricing Tab: "Своя цена" input

- Manual entry → proportionally redistributes custom price into "Цена вендора" cells (proportional to each row's Estimate share). Last row absorbs rounding remainder.
- "Проставить цены BOM" button → restores per-row original BOM prices directly (no proportional redistribution). Sets "Своя цена" to their sum.
- Both paths show "Скидка от Estimate: X%" info.
- "Экспорт CSV" button → downloads `pricing_<uuid>.csv` with UTF-8 BOM, same column order as table, plus Итого row.

---

## API Endpoints

| Method | URL | Description |
|--------|-----|-------------|
| GET | `/api/configs/:uuid/vendor-spec` | Fetch stored BOM |
| PUT | `/api/configs/:uuid/vendor-spec` | Replace BOM (full update) |
| POST | `/api/configs/:uuid/vendor-spec/resolve` | Resolve PNs → LOTs (no cart mutation) |
| POST | `/api/configs/:uuid/vendor-spec/apply` | Apply resolved LOTs to cart |
| GET | `/api/partnumber-books` | List local book snapshots |
| GET | `/api/partnumber-books/:id` | Items for a book by server_id |
| POST | `/api/sync/partnumber-books` | Pull book snapshots from MariaDB |
| POST | `/api/sync/partnumber-seen` | Push unresolved PNs to `qt_vendor_partnumber_seen` on MariaDB |

## Unresolved PN Tracking (`qt_vendor_partnumber_seen`)

After each `resolveBOM()` call, QuoteForge pushes PN rows to `POST /api/sync/partnumber-seen` (fire-and-forget from JS — errors silently ignored):

- unresolved BOM rows (`ignored = false`)
- raw BOM rows explicitly marked as ignored in UI (`ignored = true`) — these rows are **not** saved to `vendor_spec`, but are reported for server-side tracking

The handler calls `sync.PushPartnumberSeen()` which upserts into `qt_vendor_partnumber_seen`:

```sql
INSERT INTO qt_vendor_partnumber_seen (source_type, vendor, partnumber, description, is_ignored, last_seen_at)
VALUES ('manual', '', ?, ?, ?, NOW())
ON DUPLICATE KEY UPDATE
    last_seen_at = VALUES(last_seen_at),
    is_ignored   = VALUES(is_ignored),
    description  = COALESCE(NULLIF(VALUES(description), ''), description)
```

Uniqueness key: `partnumber` only (after PriceForge migration 025). PriceForge uses this table for populating the partnumber book.

## BOM Persistence

- `vendor_spec` is saved to server via `PUT /api/configs/:uuid/vendor-spec`.
- `GET` / `PUT` `vendor_spec` must preserve row-level mapping fields used by the UI:
  - `lot_mappings[]`
  - each item: `lot_name`, `quantity_per_pn`
- `description` is persisted in each BOM row and is used by the Pricing tab when available.
- Ignored raw rows are **not** persisted into `vendor_spec`.
- The PUT handler explicitly marshals `VendorSpec` to JSON string before passing to GORM `Update` (GORM does not reliably call `driver.Valuer` for custom types in `Update(column, value)`).
- BOM is autosaved (debounced) after BOM-changing actions, including:
  - `resolveBOM()`
  - LOT row qty (`LOT в 1 PN`) changes
  - LOT row add/remove (`+` / delete in bundle context)
- "Сохранить BOM" button triggers explicit save.

## Pricing Tab: Estimate Price Source

`renderPricingTab()` is async. It calls `POST /api/quote/price-levels` with LOTs collected from:

- `lot_mappings[]` from BOM rows
- current Estimate/cart LOTs not covered by BOM mappings (to show estimate-only rows)

This ensures Estimate prices appear for:

- manually matched LOTs in the BOM tab
- bundle LOTs
- LOTs already present in Estimate but not mapped from BOM

### Apply to Estimate (`Пересчитать эстимейт`)

When applying BOM to Estimate, QuoteForge builds cart rows from explicit UI mappings stored in `lot_mappings[]`.

For a BOM row with PN qty = `Q`:

- each mapped LOT contributes `Q * quantity_per_pn`

Rows without any valid LOT mapping are skipped.

## Web Route

| Route | Page |
|-------|------|
| `/partnumber-books` | Partnumber books — active book summary (unique LOTs, total PN, primary PN count), searchable items table, collapsible snapshot history |