package db

import (
	"database/sql"
	"fmt"
	"log"
	"rain_monitor/models"
	"time"

	_ "github.com/go-sql-driver/mysql"
)

var db *sql.DB

type DBConfig struct {
	Host     string
	Port     int
	User     string
	Password string
	DBName   string
}

func InitDB(config DBConfig) error {
	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=true&loc=Local",
		config.User, config.Password, config.Host, config.Port, config.DBName)

	var err error
	db, err = sql.Open("mysql", dsn)
	if err != nil {
		return fmt.Errorf("数据库连接失败: %v", err)
	}

	db.SetMaxOpenConns(20)
	db.SetMaxIdleConns(10)
	db.SetConnMaxLifetime(time.Hour)

	if err = db.Ping(); err != nil {
		return fmt.Errorf("数据库Ping失败: %v", err)
	}

	if err = createTables(); err != nil {
		return fmt.Errorf("创建表失败: %v", err)
	}

	log.Println("数据库连接成功")
	return nil
}

func CloseDB() {
	if db != nil {
		db.Close()
	}
}

func createTables() error {
	_, err := db.Exec(models.CreateWeatherDataTable)
	if err != nil {
		return fmt.Errorf("创建气象站数据表失败: %v", err)
	}

	_, err = db.Exec(models.CreateRainGaugeDataTable)
	if err != nil {
		return fmt.Errorf("创建雨量计数据表失败: %v", err)
	}

	return nil
}

func SaveWeatherData(data *models.WeatherData) (int64, error) {
	result, err := db.Exec(models.InsertWeatherDataSQL,
		data.Timestamp, data.WindSpeed, data.WindForce, data.WindDirection8, data.WindDirection360,
		data.Humidity, data.Temperature, data.Noise, data.PM25, data.PM10, data.AtmPressure,
		data.LuxHigh, data.LuxLow, data.LightIntensity, data.Rainfall, data.CompassAngle, data.SolarRadiation)
	if err != nil {
		return 0, fmt.Errorf("保存气象站数据失败: %v", err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		return 0, fmt.Errorf("获取插入ID失败: %v", err)
	}

	return id, nil
}

func SaveRainGaugeData(data *models.RainGaugeData) (int64, error) {
	result, err := db.Exec(models.InsertRainGaugeDataSQL,
		data.Timestamp, data.DailyRainfall, data.InstantRainfall, data.YesterdayRainfall,
		data.TotalRainfall, data.HourlyRainfall, data.LastHourRainfall, data.Max24hRainfall,
		data.Max24hRainfallPeriod, data.Min24hRainfall, data.Min24hRainfallPeriod)
	if err != nil {
		return 0, fmt.Errorf("保存雨量计数据失败: %v", err)
	}

	id, err := result.LastInsertId()
	if err != nil {
		return 0, fmt.Errorf("获取插入ID失败: %v", err)
	}

	return id, nil
}

func GetWeatherDataByTimeRange(start, end time.Time) ([]models.WeatherData, error) {
	rows, err := db.Query(models.QueryWeatherDataByTimeRangeSQL, start, end)
	if err != nil {
		return nil, fmt.Errorf("查询气象站数据失败: %v", err)
	}
	defer rows.Close()

	var result []models.WeatherData
	for rows.Next() {
		var data models.WeatherData
		err := rows.Scan(
			&data.ID, &data.Timestamp, &data.WindSpeed, &data.WindForce, &data.WindDirection8,
			&data.WindDirection360, &data.Humidity, &data.Temperature, &data.Noise, &data.PM25,
			&data.PM10, &data.AtmPressure, &data.LuxHigh, &data.LuxLow, &data.LightIntensity,
			&data.Rainfall, &data.CompassAngle, &data.SolarRadiation,
		)
		if err != nil {
			return nil, fmt.Errorf("扫描气象站数据失败: %v", err)
		}
		result = append(result, data)
	}

	return result, nil
}

func GetRainGaugeDataByTimeRange(start, end time.Time) ([]models.RainGaugeData, error) {
	rows, err := db.Query(models.QueryRainGaugeDataByTimeRangeSQL, start, end)
	if err != nil {
		return nil, fmt.Errorf("查询雨量计数据失败: %v", err)
	}
	defer rows.Close()

	var result []models.RainGaugeData
	for rows.Next() {
		var data models.RainGaugeData
		err := rows.Scan(
			&data.ID, &data.Timestamp, &data.DailyRainfall, &data.InstantRainfall,
			&data.YesterdayRainfall, &data.TotalRainfall, &data.HourlyRainfall,
			&data.LastHourRainfall, &data.Max24hRainfall, &data.Max24hRainfallPeriod,
			&data.Min24hRainfall, &data.Min24hRainfallPeriod,
		)
		if err != nil {
			return nil, fmt.Errorf("扫描雨量计数据失败: %v", err)
		}
		result = append(result, data)
	}

	return result, nil
}

func GetLatestWeatherData() (*models.WeatherData, error) {
	row := db.QueryRow(models.QueryLatestWeatherDataSQL)
	if row == nil {
		return nil, fmt.Errorf("没有气象站数据")
	}

	data := &models.WeatherData{}
	err := row.Scan(
		&data.ID, &data.Timestamp, &data.WindSpeed, &data.WindForce, &data.WindDirection8,
		&data.WindDirection360, &data.Humidity, &data.Temperature, &data.Noise, &data.PM25,
		&data.PM10, &data.AtmPressure, &data.LuxHigh, &data.LuxLow, &data.LightIntensity,
		&data.Rainfall, &data.CompassAngle, &data.SolarRadiation,
	)
	if err == sql.ErrNoRows {
		return nil, nil
	} else if err != nil {
		return nil, fmt.Errorf("扫描最新气象站数据失败: %v", err)
	}

	return data, nil
}

func GetLatestRainGaugeData() (*models.RainGaugeData, error) {
	row := db.QueryRow(models.QueryLatestRainGaugeDataSQL)
	if row == nil {
		return nil, fmt.Errorf("没有雨量计数据")
	}

	data := &models.RainGaugeData{}
	err := row.Scan(
		&data.ID, &data.Timestamp, &data.DailyRainfall, &data.InstantRainfall,
		&data.YesterdayRainfall, &data.TotalRainfall, &data.HourlyRainfall,
		&data.LastHourRainfall, &data.Max24hRainfall, &data.Max24hRainfallPeriod,
		&data.Min24hRainfall, &data.Min24hRainfallPeriod,
	)
	if err == sql.ErrNoRows {
		return nil, nil
	} else if err != nil {
		return nil, fmt.Errorf("扫描最新雨量计数据失败: %v", err)
	}

	return data, nil
}

func GetAggregatedData(start, end time.Time) ([]models.AggregatedData, error) {
	log.Printf("GetAggregatedData调用 - 时间范围: 开始=%v, 结束=%v", start, end)

	rows, err := db.Query(models.QueryAggregatedDataSQL, start, end, start, end)
	if err != nil {
		log.Printf("SQL查询失败: %v", err)
		return nil, fmt.Errorf("查询聚合数据失败: %v", err)
	}
	defer rows.Close()

	var result []models.AggregatedData
	for rows.Next() {
		var data models.AggregatedData
		var timestampStr string
		err := rows.Scan(
			&timestampStr, &data.Rainfall, &data.AvgTemperature, &data.AvgHumidity,
			&data.AvgWindSpeed, &data.AtmPressure, &data.SolarRadiation,
		)
		if err != nil {
			log.Printf("扫描行数据失败: %v", err)
			return nil, fmt.Errorf("扫描聚合数据失败: %v", err)
		}
		data.FormattedTime = timestampStr
		result = append(result, data)
	}

	log.Printf("查询结果: 找到 %d 条记录", len(result))
	return result, nil
}