package com.dashboard.aws.lambda.service;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.*;
import java.util.*;

public class MySQLService {

    private static final Logger logger = LoggerFactory.getLogger(MySQLService.class);

    private static final String MYSQL_URL = System.getenv("DB_URL"); // 统一实例URL
    private static final String DB_USER = System.getenv("DB_USER");
    private static final String DB_PASSWORD = System.getenv("DB_PASSWORD");


    /**
     * 获取符合条件的企业ID
     */
    public List<Long> getActiveCompanyIds() throws SQLException {
        String sql = """
            SELECT id FROM data_center_new.basic_company
            WHERE flag != 1
            AND (parent_id = -1 OR parent_id = 1)
            """;

        try (Connection conn = DriverManager.getConnection(MYSQL_URL, DB_USER, DB_PASSWORD);
             PreparedStatement ps = conn.prepareStatement(sql);
             ResultSet rs = ps.executeQuery()) {

            List<Long> ids = new ArrayList<>();
            while (rs.next()) {
                ids.add(rs.getLong("id"));
            }
            return ids;
        }
    }

    public List<Map<String, Object>> queryOldData(String schema, String table, long startTs, long endTs) throws SQLException {
        String sql = String.format("SELECT * FROM %s.%s WHERE upload_at >= ? AND upload_at < ?", schema, table);
        logger.info("query sql: {}, start: {}, end: {}", sql, startTs, endTs);

        try (Connection conn = DriverManager.getConnection(MYSQL_URL, DB_USER, DB_PASSWORD);
             PreparedStatement ps = conn.prepareStatement(sql)) {

            ps.setLong(1, startTs);
            ps.setLong(2, endTs);

            ResultSet rs = ps.executeQuery();
            ResultSetMetaData meta = rs.getMetaData();
            List<Map<String, Object>> list = new ArrayList<>();

            while (rs.next()) {
                Map<String, Object> row = new LinkedHashMap<>();
                for (int i = 1; i <= meta.getColumnCount(); i++) {
                    row.put(meta.getColumnName(i), rs.getObject(i));
                }
                list.add(row);
            }
            return list;
        }
    }

    public void deleteOldData(String schema, String table, long startTs, long endTs) throws SQLException {
        String sql = String.format("DELETE FROM %s.%s WHERE upload_at >= ? AND upload_at < ?", schema, table);
        logger.info("deleteOldData sql: {}, start: {}, end: {}", sql, startTs, endTs);

        try (Connection conn = DriverManager.getConnection(MYSQL_URL, DB_USER, DB_PASSWORD);
             PreparedStatement ps = conn.prepareStatement(sql)) {

            ps.setLong(1, startTs);
            ps.setLong(2, endTs);
            int deleted = ps.executeUpdate();
            logger.info("[{}.{}] 删除 {} 条记录", schema, table, deleted);
        }
    }

    public int insertRows(String schema, String table, List<Map<String, String>> rows) throws SQLException {
        if (rows == null || rows.isEmpty()) return 0;

        Map<String, String> first = rows.get(0);
        List<String> columns = new ArrayList<>(first.keySet());
        String columnStr = String.join(",", columns);
        String placeholders = String.join(",", Collections.nCopies(columns.size(), "?"));
        String sql = String.format("INSERT INTO %s.%s (%s) VALUES (%s)", schema, table, columnStr, placeholders);
        logger.info("insert sql: {}", sql);

        int total = 0;
        try (java.sql.Connection conn = java.sql.DriverManager.getConnection(MYSQL_URL, DB_USER, DB_PASSWORD);
             java.sql.PreparedStatement ps = conn.prepareStatement(sql)) {

            for (Map<String, String> row : rows) {
                for (int i = 0; i < columns.size(); i++) {
                    ps.setString(i + 1, row.getOrDefault(columns.get(i), null));
                }
                ps.addBatch();
            }
            int[] results = ps.executeBatch();
            for (int r : results) total += r;
        }
        return total;
    }
}