import asyncio
import os
import time
import json
import random
from datetime import datetime, timezone
from sqlalchemy import insert, select, text
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy.engine.url import make_url
from backend.database.schema import vehicle_signals, Simulation, init_schema, init_timescaledb
from backend.config.settings import load_settings

# 模拟数据生成
def generate_payload():
    return {
        "steering_wheel_angle_deg": round(random.uniform(-450, 450), 1),
        "brake_pedal_travel_mm": round(random.uniform(0, 100), 1),
        "throttle_pedal_travel_mm": round(random.uniform(0, 100), 1),
        "gear": random.choice(["P", "N", "D", "R"]),
        "handbrake": random.choice([0, 1]),
        "vehicle_speed_kmh": round(random.uniform(0, 180), 1),
        "wheel_speed_rpm": {
            "FL": random.randint(0, 2000),
            "FR": random.randint(0, 2000),
            "RL": random.randint(0, 2000),
            "RR": random.randint(0, 2000)
        },
        "lights": {
            "left_turn": random.choice([0, 1]),
            "right_turn": random.choice([0, 1]),
            "hazard": random.choice([0, 1]),
            "brake": random.choice([0, 1])
        },
        "soc_percent": round(random.uniform(0, 100), 1),
        "voltage_v": round(random.uniform(300, 400), 1),
        "current_a": round(random.uniform(-50, 200), 1),
        "temperature_c": round(random.uniform(20, 80), 1)
    }

def _redact_url(url: str) -> str:
    try:
        parsed = make_url(url)
        if parsed.password:
            parsed = parsed.set(password="***")
        return str(parsed)
    except Exception:
        return url

async def run_test():
    settings = load_settings()

    db_url = os.getenv("SMARTEDT_TEST_DATABASE_URL", settings.database.url).strip()
    print(f"Connecting to DB: {_redact_url(db_url)}")
    engine = create_async_engine(db_url, echo=False)

    # 0. 初始化表结构 (如果不存在)
    print("Initializing schema...")
    await init_schema(engine)
    try:
        await init_timescaledb(engine)
        print("Schema and TimescaleDB initialized.")
    except Exception as e:
        print(f"TimescaleDB init warning (might already exist): {e}")
    
    # 1. 准备测试数据
    total_records = int(os.getenv("SMARTEDT_TEST_RECORDS", "300000"))
    batch_size = int(os.getenv("SMARTEDT_TEST_BATCH_SIZE", "1000"))
    simulation_id = f"TEST_SIM_{int(time.time())}"
    device_id = "test_device_01"
    
    print(f"Generating {total_records} records for simulation {simulation_id}...")
    
    print("Starting insertion test...")
    
    # 2. 插入性能测试
    insert_start_time = time.time()
    
    async with engine.begin() as conn:
        # 分批插入
        for base_seq in range(0, total_records, batch_size):
            batch = []
            end_seq = min(base_seq + batch_size, total_records)
            for seq in range(base_seq, end_seq):
                batch.append(
                    {
                        "ts": datetime.now(timezone.utc),
                        "simulation_id": simulation_id,
                        "device_id": device_id,
                        "seq": seq,
                        "signals": generate_payload(),
                    }
                )
            await conn.execute(insert(vehicle_signals), batch)
            if end_seq % 50000 == 0:
                print(f"Inserted {end_seq} records...")
    
    insert_end_time = time.time()
    insert_duration = insert_end_time - insert_start_time
    print(f"\n✅ Insertion Test Complete:")
    print(f"Total Records: {total_records}")
    print(f"Time Taken: {insert_duration:.4f} seconds")
    print(f"Throughput: {total_records / insert_duration:.2f} records/sec")
    
    # 3. 查询性能测试
    print("\nStarting query performance test...")
    
    # 3.1 简单计数查询
    query_start = time.time()
    async with engine.connect() as conn:
        result = await conn.execute(
            select(text("count(*)")).select_from(vehicle_signals).where(vehicle_signals.c.simulation_id == simulation_id)
        )
        count = result.scalar()
    query_end = time.time()
    print(f"Query 1 (Count): Found {count} records in {query_end - query_start:.4f} seconds")
    
    # 3.2 复杂 JSONB 查询 (查询车速 > 100 的记录数)
    # 注意：JSONB 查询语法取决于数据库和 SQLAlchemy 版本，这里使用 text() 以确保兼容性
    query_start = time.time()
    async with engine.connect() as conn:
        # 查询 signals->>'vehicle_speed_kmh' > 100
        stmt = text(
            "SELECT count(*) FROM vehicle_signals "
            "WHERE simulation_id = :sim_id "
            "AND (signals->>'vehicle_speed_kmh')::float > 100"
        )
        result = await conn.execute(stmt, {"sim_id": simulation_id})
        high_speed_count = result.scalar()
    query_end = time.time()
    print(f"Query 2 (JSONB Filter): Found {high_speed_count} records with speed > 100 in {query_end - query_start:.4f} seconds")
    
    # 3.3 时间范围查询 (查询最近 1000 条)
    query_start = time.time()
    async with engine.connect() as conn:
        stmt = (
            select(vehicle_signals)
            .where(vehicle_signals.c.simulation_id == simulation_id)
            .order_by(vehicle_signals.c.ts.desc())
            .limit(1000)
        )
        result = await conn.execute(stmt)
        rows = result.fetchall()
    query_end = time.time()
    print(f"Query 3 (Time Range Limit): Retrieved {len(rows)} records in {query_end - query_start:.4f} seconds")

    await engine.dispose()

if __name__ == "__main__":
    # 确保在 Windows 上正确运行 asyncio
    if hasattr(asyncio, 'WindowsSelectorEventLoopPolicy'):
        asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
        
    asyncio.run(run_test())