# QuoteForge - Claude Code Instructions

## Overview
Корпоративный конфигуратор серверов и формирование КП. MariaDB (RFQ_LOG) + SQLite для оффлайн.

## Development Phases

### Phase 1: Pricelists in MariaDB ✅ DONE
### Phase 2: Local SQLite Database ✅ DONE

### Phase 2.5: Full Offline Mode 🔶 IN PROGRESS
Приложение должно полностью работать без MariaDB, синхронизация при восстановлении связи.

**Architecture:**
- Dual-source pattern: все операции идут через unified service layer
- Online: read/write MariaDB, async cache to SQLite
- Offline: read/write SQLite, queue changes for sync

**TODO:**
- ❌ Unified repository interface (online/offline transparent switching)
- ❌ Sync queue table (pending_changes: entity_type, entity_uuid, operation, payload, created_at)
- ❌ Background sync worker (push local changes when online)
- ❌ Conflict resolution (last-write-wins by updated_at, or manual)
- ❌ Initial data bootstrap (first sync downloads all needed data)
- ❌ Handlers use context.IsOffline to choose data source
- ❌ UI: pending changes counter, manual sync button, conflict alerts

**Sync flow:**
1. Online → Offline: continue work, changes saved locally with sync_status='pending'
2. Offline → Online: background worker pushes pending_changes, pulls updates
3. Conflict: if server version newer, mark as 'conflict' for manual resolution

### Phase 3: Projects and Specifications
- qt_projects, qt_specifications tables (MariaDB)
- Replace qt_configurations → Project/Specification hierarchy
- Fields: opty, customer_requirement, variant, qty, rev
- Local projects/specs with server sync

### Phase 4: Price Versioning
- Bind specifications to pricelist versions
- Price diff comparison
- Auto-cleanup expired pricelists (>1 year, usage_count=0)

## Tech Stack
Go 1.22+ | Gin | GORM | MariaDB 11 | SQLite (glebarez/sqlite) | htmx + Tailwind CDN | excelize

## Key Tables

### READ-ONLY (external systems)
- `lot` (lot_name PK, lot_description)
- `lot_log` (lot, supplier, date, price, quality, comments)
- `supplier` (supplier_name PK)

### MariaDB (qt_* prefix)
- `qt_lot_metadata` - component prices, methods, popularity
- `qt_categories` - category codes and names
- `qt_pricelists` - version snapshots (YYYY-MM-DD-NNN format)
- `qt_pricelist_items` - prices per pricelist
- `qt_projects` - uuid, opty, customer_requirement, name (Phase 3)
- `qt_specifications` - project_id, pricelist_id, variant, rev, qty, items JSON (Phase 3)

### SQLite (data/quoteforge.db)
- `connection_settings` - encrypted DB credentials
- `local_pricelists/items` - cached from server
- `local_components` - lot cache for offline search
- `local_configurations` - with sync_status (pending/synced/conflict)
- `local_projects/specifications` - Phase 3
- `pending_changes` - sync queue (entity_type, uuid, op, payload, created_at)

## Business Logic

**Part number parsing:** `CPU_AMD_9654` → category=`CPU`, model=`AMD_9654`

**Price methods:** manual | median | average | weighted_median

**Price freshness:** fresh (<30d, ≥3 quotes) | normal (<60d) | stale (<90d) | critical

**Pricelist version:** `YYYY-MM-DD-NNN` (e.g., `2024-01-31-001`)

## API Endpoints

| Group | Endpoints |
|-------|-----------|
| Setup | GET/POST /setup, POST /setup/test |
| Components | GET /api/components, /api/categories |
| Pricelists | CRUD /api/pricelists, GET /latest, POST /compare |
| Projects | CRUD /api/projects/:uuid (Phase 3) |
| Specs | CRUD /api/specs/:uuid, POST /upgrade, GET /diff (Phase 3) |
| Sync | GET /status, POST /components, /pricelists, /push, /pull, /resolve-conflict |
| Export | GET /api/specs/:uuid/export, /api/projects/:uuid/export |

## Commands
```bash
go run ./cmd/server          # Dev server
go run ./cmd/cron -job=X     # cleanup-pricelists | update-prices | update-popularity
CGO_ENABLED=0 go build -ldflags="-s -w" -o bin/quoteforge ./cmd/server
```

## Code Style
- gofmt, structured logging (slog), wrap errors with context
- snake_case files, PascalCase types
- RBAC disabled: DB username = user_id via `models.EnsureDBUser()`

## UI Guidelines
- htmx (hx-get/post/target/swap), Tailwind CDN
- Freshness colors: green (fresh) → yellow → orange → red (critical)
- Sync status + offline indicator in header