package com.se.simu.utils;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVRecord;

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.sql.*;

/**
 * CSV 到 SQLite 实用程序
 *
 * @author xingjinshuang@smartearth.cn
 * @date 2024/12/26
 */
public class CsvToSQLiteUtils {

    private static final String DATABASE_URL = "jdbc:sqlite:D:\\0a_project\\simulation\\simuserver\\rainfall.db"; // SQLite数据库路径
    private static final String CREATE_TABLE_SQL =
            "CREATE TABLE IF NOT EXISTS rainfall (" +
                    "    id INTEGER PRIMARY KEY AUTOINCREMENT," +
                    "    station_name TEXT NOT NULL," +
                    "    rainfall REAL NOT NULL," +
                    "    longitude REAL NOT NULL," +
                    "    latitude REAL NOT NULL," +
                    "    datetime TEXT NOT NULL" +
                    ");";

    private static final String INSERT_DATA_SQL =
            "INSERT INTO rainfall (station_name, rainfall, longitude, latitude, datetime) " +
                    "VALUES (?, ?, ?, ?, ?);";

    public static void main(String[] args) {
        // CSV文件路径
        String csvFilePath = "D:\\0a_project\\model\\shp\\雨量站点数据\\雨量站包含坐标.csv";

        // 1. 创建SQLite数据库连接
        try (Connection conn = DriverManager.getConnection(DATABASE_URL)) {
            if (conn != null) {
                // 获取当前时间戳
                Timestamp timestamp = new Timestamp(System.currentTimeMillis());
                String tableName = "rainfall_" + timestamp.getTime();
                System.out.println("tableName = " + tableName);
                // 2. 创建表
                createTableIfNotExists(conn, tableName);

                // 3. 设置 SQLite 连接的字符编码为 UTF-8
                try (Statement stmt = conn.createStatement()) {
                    stmt.execute("PRAGMA encoding = 'UTF-8';");  // 设置SQLite编码为UTF-8
                }

                // 4. 开始事务
                conn.setAutoCommit(false);

                // 5. 读取CSV文件并插入数据
                readCsvAndInsertData(csvFilePath, conn, tableName);

                // 6. 提交事务
                conn.commit();

                System.out.println("数据成功插入到SQLite数据库！");
            }
        } catch (SQLException e) {
            System.err.println("SQLite连接失败: " + e.getMessage());
        }
    }

    /**
     * 创建表，如果不存在的话
     */
    private static void createTableIfNotExists(Connection conn) throws SQLException {
        try (Statement stmt = conn.createStatement()) {
            stmt.execute(CREATE_TABLE_SQL);
        }
    }

    private static void createTableIfNotExists(Connection conn, String tableName) throws SQLException {

        try (Statement stmt = conn.createStatement()) {
            String CREATE_TABLE_SQL =
                    "CREATE TABLE IF NOT EXISTS " + tableName + " (" +
                            "    id INTEGER PRIMARY KEY AUTOINCREMENT," +
                            "    station_name TEXT NOT NULL," +
                            "    rainfall REAL NOT NULL," +
                            "    longitude REAL NOT NULL," +
                            "    latitude REAL NOT NULL," +
                            "    datetime TEXT NOT NULL" +
                            ");";
            stmt.execute(CREATE_TABLE_SQL);
        }
    }

    /**
     * 读取CSV文件并将数据插入到SQLite数据库
     *
     * @param csvFilePath CSV文件路径
     * @param conn        SQLite数据库连接
     */
    private static void readCsvAndInsertData(String csvFilePath, Connection conn, String tableName) {
        // 使用 Apache Commons CSV 读取CSV文件
        try (Reader reader = new InputStreamReader(Files.newInputStream(Paths.get(csvFilePath)), "GBK")) {
//        try (Reader reader = new InputStreamReader(Files.newInputStream(Paths.get(csvFilePath)), StandardCharsets.UTF_8)) {
            Iterable<CSVRecord> records = CSVFormat.DEFAULT
                    .withHeader("雨量站", "降雨量", "经度", "纬度", "datatime")
                    .withSkipHeaderRecord() // 跳过表头
                    .parse(reader);

            String INSERT_DATA_SQL =
                    "INSERT INTO " + tableName + " (station_name, rainfall, longitude, latitude, datetime) " +
                            "VALUES (?, ?, ?, ?, ?);";

            // 准备SQL插入语句
            try (PreparedStatement pstmt = conn.prepareStatement(INSERT_DATA_SQL)) {
                int batchSize = 1000;  // 每批插入的数量
                int count = 0;

                for (CSVRecord record : records) {
                    // 获取每一列的数据
                    String stationName = record.get("雨量站");
                    double rainfall = Double.parseDouble(record.get("降雨量"));
                    double longitude = Double.parseDouble(record.get("经度"));
                    double latitude = Double.parseDouble(record.get("纬度"));
                    String datetime = record.get("datatime");

                    // 设置插入数据的参数
                    pstmt.setString(1, stationName);
                    pstmt.setDouble(2, rainfall);
                    pstmt.setDouble(3, longitude);
                    pstmt.setDouble(4, latitude);
                    pstmt.setString(5, datetime);

                    // 批量添加到批处理中
                    pstmt.addBatch();
                    count++;

                    // 每1000条数据执行一次批处理
                    if (count % batchSize == 0) {
                        pstmt.executeBatch();  // 执行批量插入
                    }
                }
                // 执行剩余的批量插入
                pstmt.executeBatch();
            }
        } catch (IOException | SQLException e) {
            System.err.println("读取CSV或插入数据时出错: " + e.getMessage());
        }
    }


    /**
     * 读取 CSV 保存本地
     *
     * @param stationRainFile Station Rain 文件
     * @param tableName       表名称
     */
    public static void readCsvSaveLocal(String stationRainFile, String tableName) {
        // 1. 创建SQLite数据库连接
        try (Connection conn = DriverManager.getConnection("jdbc:sqlite:rainfall.db")) {
            if (conn != null) {
                // 2. 创建表（如果不存在）
                createTableIfNotExists(conn, tableName);
                // 3. 设置SQLite连接的字符编码为UTF-8
                try (Statement stmt = conn.createStatement()) {
                    // 设置SQLite编码为UTF-8
                    stmt.execute("PRAGMA encoding = 'UTF-8';");
                }
                // 4. 开始事务
                conn.setAutoCommit(false);
                // 5. 读取CSV文件并插入数据
                readCsvAndInsertDatas(stationRainFile, conn, tableName);
                // 6. 提交事务
                conn.commit();
                System.out.println("数据成功插入到SQLite数据库！");
            }
        } catch (SQLException e) {
            System.err.println("SQLite连接失败: " + e.getMessage());
        }
    }


    private static void readCsvAndInsertDatas(String csvFilePath, Connection conn, String tableName) {
        // 使用 Apache Commons CSV 读取CSV文件
        try (Reader reader = new InputStreamReader(Files.newInputStream(Paths.get(csvFilePath)), "GBK")) {
            Iterable<CSVRecord> records = CSVFormat.DEFAULT
                    .withHeader("雨量站", "降雨量", "经度", "纬度", "datatime")
                    .withSkipHeaderRecord() // 跳过表头
                    .parse(reader);

            String insertDataSql = "INSERT INTO " + tableName + " (station_name, rainfall, longitude, latitude, datetime) VALUES (?, ?, ?, ?, ?);";

            try (PreparedStatement pstmt = conn.prepareStatement(insertDataSql)) {
                // 批量大小
                int batchSize = 1000;
                int count = 0;

                for (CSVRecord record : records) {
                    // 获取每一列的数据
                    String stationName = record.get("雨量站");
                    double rainfall = Double.parseDouble(record.get("降雨量"));
                    double longitude = Double.parseDouble(record.get("经度"));
                    double latitude = Double.parseDouble(record.get("纬度"));
                    String datetime = record.get("datatime");

                    // 设置插入数据的参数
                    pstmt.setString(1, stationName);
                    pstmt.setDouble(2, rainfall);
                    pstmt.setDouble(3, longitude);
                    pstmt.setDouble(4, latitude);
                    pstmt.setString(5, datetime);

                    // 添加到批处理
                    pstmt.addBatch();
                    count++;

                    // 每batchSize条数据执行一次批量插入
                    if (count % batchSize == 0) {
                        pstmt.executeBatch();
                    }
                }
                // 执行剩余的批量插入
                pstmt.executeBatch();
            } catch (SQLException e) {
                System.err.println("批量插入数据时出错: " + e.getMessage());
            }
        } catch (IOException e) {
            System.err.println("读取CSV或插入数据时出错: " + e.getMessage());
        }
    }

}