#!/usr/bin/env bash
# ══════════════════════════════════════════════════
# 05_init_db.sh
# 初始化数据库：PostgreSQL Schema + Milvus Collections + Neo4j Constraints
# 用法：bash scripts/05_init_db.sh
# 前提：postgres / milvus / neo4j 已运行且健康
# ══════════════════════════════════════════════════
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
cd "$PROJECT_DIR"

RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; BLUE='\033[0;34m'; NC='\033[0m'
info()  { echo -e "${BLUE}[INFO]${NC} $*"; }
ok()    { echo -e "${GREEN}[OK]${NC} $*"; }
warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
error() { echo -e "${RED}[ERROR]${NC} $*"; exit 1; }

source .env 2>/dev/null || true
POSTGRES_PASSWORD=${POSTGRES_PASSWORD:-compliance123}
NEO4J_PASSWORD=${NEO4J_PASSWORD:-neo4j123}

# ── Step 1：PostgreSQL Schema ───────────────────
info "Step 1/3：初始化 PostgreSQL Schema..."
if docker compose ps postgres | grep -q "healthy"; then
    docker compose exec -T postgres psql \
        -U compliance -d compliance_db \
        -f /docker-entrypoint-initdb.d/01_init_schema.sql \
        2>&1 | tail -5 || warn "SQL 可能部分已存在（IF NOT EXISTS），这是正常的"
    ok "PostgreSQL Schema 初始化完成"
else
    error "PostgreSQL 未运行，请先执行：bash scripts/03_start_infra.sh"
fi

# ── Step 2：Milvus Collections ──────────────────
info "Step 2/3：初始化 Milvus Collections..."
if docker compose ps milvus | grep -q "healthy"; then
    docker compose run --rm --no-deps compliance-backend \
        python3 -c "
import asyncio
from pymilvus import connections, Collection, CollectionSchema, FieldSchema, DataType, utility

connections.connect(host='milvus', port='19530')
print('Milvus 连接成功')

def create_collection(name, description):
    if utility.has_collection(name):
        print(f'  Collection {name} 已存在，跳过')
        return

    fields = [
        FieldSchema(name='id',        dtype=DataType.VARCHAR, is_primary=True, max_length=128),
        FieldSchema(name='file_id',   dtype=DataType.VARCHAR, max_length=128),
        FieldSchema(name='workspace_id', dtype=DataType.VARCHAR, max_length=128),
        FieldSchema(name='chunk_idx', dtype=DataType.INT64),
        FieldSchema(name='content',   dtype=DataType.VARCHAR, max_length=65535),
        FieldSchema(name='dense_vec', dtype=DataType.FLOAT_VECTOR, dim=1024),  # BGE-M3 dense
        FieldSchema(name='metadata',  dtype=DataType.JSON),
    ]
    schema = CollectionSchema(fields, description=description)
    col = Collection(name, schema)

    # 创建向量索引（HNSW，适合调研阶段）
    index_params = {
        'metric_type': 'COSINE',
        'index_type':  'HNSW',
        'params': {'M': 16, 'efConstruction': 200}
    }
    col.create_index('dense_vec', index_params)
    col.load()
    print(f'  Collection {name} 创建完成')

create_collection('regulation_chunks', '法规条款向量库')
create_collection('doc_chunks',        '企业文档向量库')
create_collection('case_library',      '行业案例库')

print('Milvus 初始化完成')
" 2>&1
    ok "Milvus Collections 初始化完成"
else
    error "Milvus 未运行，请先执行：bash scripts/03_start_infra.sh"
fi

# ── Step 3：Neo4j 约束和索引 ────────────────────
info "Step 3/3：初始化 Neo4j 约束和索引..."
sleep 5  # Neo4j 可能还在预热

docker compose exec -T neo4j cypher-shell \
    -u neo4j -p "$NEO4J_PASSWORD" \
    --format plain <<'CYPHER'
// 节点约束（唯一性）
CREATE CONSTRAINT regulation_id IF NOT EXISTS
    FOR (r:Regulation) REQUIRE r.id IS UNIQUE;
CREATE CONSTRAINT clause_id IF NOT EXISTS
    FOR (c:Clause) REQUIRE c.id IS UNIQUE;
CREATE CONSTRAINT obligation_id IF NOT EXISTS
    FOR (o:Obligation) REQUIRE o.id IS UNIQUE;

// 全文索引（模糊查询）
CREATE FULLTEXT INDEX regulation_fulltext IF NOT EXISTS
    FOR (r:Regulation) ON EACH [r.title, r.code, r.domain];
CREATE FULLTEXT INDEX clause_fulltext IF NOT EXISTS
    FOR (c:Clause) ON EACH [c.content, c.title];

// 插入示例节点（验证连通性）
MERGE (d:Domain {name: 'vehicle_safety', label: '车辆安全法规'});
MERGE (d:Domain {name: 'data_security',  label: '数据安全法规'});
MERGE (d:Domain {name: 'ehs',            label: 'EHS安全法规'});
MERGE (d:Domain {name: 'carbon',         label: '碳排放法规'});
RETURN '初始化完成' AS result;
CYPHER
    ok "Neo4j 约束和索引初始化完成"

echo ""
echo -e "${GREEN}══════════════════════════════════════════${NC}"
echo -e "${GREEN}  数据库初始化完成！${NC}"
echo -e "${GREEN}══════════════════════════════════════════${NC}"
echo ""
echo "  PostgreSQL: 所有表已创建"
echo "  Milvus:     regulation_chunks / doc_chunks / case_library"
echo "  Neo4j:      约束 + 全文索引 + 基础域节点"
echo ""
echo "下一步：bash scripts/06_start_all.sh"