-- DAT10 전술 오프라인 단말 로컬 SQLite DB 스키마
PRAGMA foreign_keys = ON;

-- 1. 마스터 재고 품목 테이블
CREATE TABLE IF NOT EXISTS inventory_items (
    nsn_code TEXT PRIMARY KEY,
    item_name TEXT NOT NULL,
    supply_class TEXT NOT NULL CHECK(supply_class IN ('Class_I', 'Class_II', 'Class_III', 'Class_IV', 'Class_V', 'Class_IX')),
    criticality_level TEXT DEFAULT 'NORMAL' CHECK(criticality_level IN ('CRITICAL', 'HIGH', 'NORMAL', 'LOW')),
    unit_cost REAL NOT NULL DEFAULT 0.0,
    safety_stock_threshold INTEGER NOT NULL DEFAULT 10,
    total_local_stock INTEGER NOT NULL DEFAULT 0,
    crdt_clock INTEGER NOT NULL DEFAULT 0,
    updated_at_utc TEXT NOT NULL
);

-- 2. 오프라인 트랜잭션 및 해시체인 로그 테이블
CREATE TABLE IF NOT EXISTS offline_transactions (
    transaction_id TEXT PRIMARY KEY,
    terminal_id TEXT NOT NULL,
    unit_id TEXT NOT NULL,
    nsn_code TEXT NOT NULL,
    tx_type TEXT NOT NULL CHECK(tx_type IN ('RECEIPT', 'ISSUE', 'TRANSFER', 'DISPOSAL', 'ADJUSTMENT', 'FIELD_CONSUME')),
    quantity INTEGER NOT NULL CHECK(quantity > 0),
    stock_after INTEGER NOT NULL CHECK(stock_after >= 0),
    comms_status TEXT NOT NULL,
    grid_coords TEXT,
    weather_condition TEXT,
    lamport_timestamp INTEGER NOT NULL,
    timestamp_utc TEXT NOT NULL,
    prev_hash TEXT NOT NULL,
    record_hash TEXT NOT NULL,
    sync_status TEXT DEFAULT 'PENDING' CHECK(sync_status IN ('PENDING', 'SYNCED_P2P', 'SYNCED_CLOUD', 'CONFLICT_LOCKED')),
    FOREIGN KEY(nsn_code) REFERENCES inventory_items(nsn_code)
);

-- 3. CRDT 양방향 동기화 및 충돌 큐 테이블
CREATE TABLE IF NOT EXISTS sync_conflict_queue (
    conflict_id TEXT PRIMARY KEY,
    transaction_id TEXT NOT NULL,
    nsn_code TEXT NOT NULL,
    local_stock INTEGER NOT NULL,
    incoming_stock INTEGER NOT NULL,
    local_clock INTEGER NOT NULL,
    incoming_clock INTEGER NOT NULL,
    conflict_reason TEXT NOT NULL,
    hitl_status TEXT DEFAULT 'PENDING_REVIEW' CHECK(hitl_status IN ('PENDING_REVIEW', 'APPROVED_LOCAL', 'APPROVED_REMOTE', 'MANUAL_MERGED', 'REJECTED')),
    resolved_by TEXT,
    resolved_stock INTEGER,
    resolution_memo TEXT,
    resolved_at_utc TEXT,
    FOREIGN KEY(transaction_id) REFERENCES offline_transactions(transaction_id)
);

-- 4. P2P 피어 단말 정보 테이블
CREATE TABLE IF NOT EXISTS p2p_peers (
    peer_terminal_id TEXT PRIMARY KEY,
    unit_id TEXT NOT NULL,
    last_known_ip TEXT,
    last_sync_timestamp TEXT,
    last_sync_lamport INTEGER DEFAULT 0,
    trust_score REAL DEFAULT 1.0
);

-- 5. 공급망 재난 및 이상 징후 알림 테이블
CREATE TABLE IF NOT EXISTS supply_disaster_alerts (
    alert_id TEXT PRIMARY KEY,
    nsn_code TEXT NOT NULL,
    alert_type TEXT NOT NULL,
    severity TEXT NOT NULL CHECK(severity IN ('CRITICAL', 'WARNING', 'INFO')),
    confidence_score REAL NOT NULL,
    description TEXT NOT NULL,
    detected_at_utc TEXT NOT NULL,
    is_acknowledged INTEGER DEFAULT 0
);

-- 인덱스 생성
CREATE INDEX IF NOT EXISTS idx_tx_timestamp ON offline_transactions(timestamp_utc);
CREATE INDEX IF NOT EXISTS idx_tx_nsn ON offline_transactions(nsn_code);
CREATE INDEX IF NOT EXISTS idx_tx_sync_status ON offline_transactions(sync_status);