package com.iplatform.base.controller;

import com.iplatform.base.SystemController;
import com.iplatform.core.util.CharsetKit;
import com.iplatform.core.util.Convert;
import com.iplatform.mybatis.domain.GenTable;
import com.iplatform.mybatis.domain.GenTableColumn;
import com.iplatform.mybatis.domain.TableDataInfo;
import com.iplatform.mybatis.service.IGenTableColumnService;
import com.iplatform.mybatis.service.IGenTableService;
import com.iplatform.mybatis.service.MetaDataServiceImpl;
import com.iplatform.mybatis.util.VelocityInitializer;
import com.iplatform.mybatis.util.VelocityUtils;
import com.walker.infrastructure.utils.StringUtils;
import com.walker.web.ResponseValue;
import org.apache.commons.io.IOUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * 代码生成 操作处理。
 * <pre>
 *     1) 参考第三方代码，界面可以调用该接口生成代码。
 *     2) 目前仅使用生成数据库实体，以及service实现，前端vue暂不生成。
 * </pre>
 *
 * @author manton
 * @author 时克英
 * @date 2024-01-16 修改
 */
//@Api(value = "代码生成管理", tags = {"代码生成管理"})
@RestController
@RequestMapping("/tool/generate")
public class GenController extends SystemController
{
    @Autowired
    private IGenTableService genTableService;

    @Autowired
    private IGenTableColumnService genTableColumnService;

    @Autowired
    private MetaDataServiceImpl metaDataService;

    /**
     * 查询代码生成列表
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:list')")
    @GetMapping("/list")
    public TableDataInfo genList(GenTable genTable)
    {
//        startPage();
        List<GenTable> list = genTableService.selectGenTableList(genTable);
        return getDataTable(list);
    }

    /**
     * 修改代码生成业务
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:query')")
    @GetMapping(value = "/{tableId}")
    public ResponseValue getInfo(@PathVariable Long tableId)
    {
        GenTable table = genTableService.selectGenTableById(tableId);
        List<GenTable> tables = genTableService.selectGenTableAll();
        List<GenTableColumn> list = genTableColumnService.selectGenTableColumnListByTableId(tableId);
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("info", table);
        map.put("rows", list);
        map.put("tables", tables);
//        return success(map);
        return ResponseValue.success(map);
    }

    /**
     * 查询数据库列表
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:list')")
    @GetMapping("/db/list")
    public TableDataInfo dataList(GenTable genTable)
    {
//        startPage();
        List<GenTable> list = genTableService.selectDbTableList(genTable);
        return getDataTable(list);
    }

    /**
     * 查询数据表字段列表
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:list')")
    @GetMapping(value = "/column/{tableId}")
    public TableDataInfo columnList(Long tableId)
    {
        TableDataInfo dataInfo = new TableDataInfo();
        List<GenTableColumn> list = genTableColumnService.selectGenTableColumnListByTableId(tableId);
        dataInfo.setRows(list);
        dataInfo.setTotal(list.size());
        return dataInfo;
    }

    /**
     * 导入表结构（保存）
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:import')")
//    @Log(title = "代码生成", businessType = BusinessType.IMPORT)
    @PostMapping("/importTable")
    public ResponseValue importTableSave(String tables)
    {
        String[] tableNames = Convert.toStrArray(tables);
        // 查询表信息
        List<GenTable> tableList = genTableService.selectDbTableListByNames(tableNames);
        genTableService.importGenTable(tableList);
        return ResponseValue.success();
    }

    /**
     * 修改保存代码生成业务
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:edit')")
//    @Log(title = "代码生成", businessType = BusinessType.UPDATE)
    @PutMapping
    public ResponseValue editSave(@Validated @RequestBody GenTable genTable)
    {
        genTableService.validateEdit(genTable);
        genTableService.updateGenTable(genTable);
        return ResponseValue.success();
    }

    /**
     * 删除代码生成
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:remove')")
//    @Log(title = "代码生成", businessType = BusinessType.DELETE)
    @DeleteMapping("/{tableIds}")
    public ResponseValue remove(@PathVariable Long[] tableIds)
    {
        genTableService.deleteGenTableByIds(tableIds);
        return ResponseValue.success();
    }

    /**
     * 预览代码
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:preview')")
    @GetMapping("/preview/{tableId}")
    public ResponseValue preview(@PathVariable("tableId") Long tableId) throws IOException
    {
        Map<String, String> dataMap = genTableService.previewCode(tableId);
        return ResponseValue.success(dataMap);
    }

    /**
     * 生成代码（下载方式）
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:code')")
//    @Log(title = "代码生成", businessType = BusinessType.GENCODE)
    @GetMapping("/download/{tableName}")
    public void download(HttpServletResponse response, @PathVariable("tableName") String tableName) throws IOException
    {
        byte[] data = genTableService.downloadCode(tableName);
        genCode(response, data);
    }

    /**
     * 生成代码（自定义路径）
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:code')")
//    @Log(title = "代码生成", businessType = BusinessType.GENCODE)
    @GetMapping("/genCode/{tableName}")
    public ResponseValue genCode(@PathVariable("tableName") String tableName)
    {
        genTableService.generatorCode(tableName);
        return ResponseValue.success();
    }

    /**
     * 同步数据库
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:edit')")
//    @Log(title = "代码生成", businessType = BusinessType.UPDATE)
    @GetMapping("/synchDb/{tableName}")
    public ResponseValue synchDb(@PathVariable("tableName") String tableName)
    {
        genTableService.synchDb(tableName);
        return ResponseValue.success();
    }

    /**
     * 批量生成代码
     */
//    @PreAuthorize("@ss.hasPermi('tool:gen:code')")
//    @Log(title = "代码生成", businessType = BusinessType.GENCODE)
    @GetMapping("/batchGenCode")
    public void batchGenCode(HttpServletResponse response, String tables) throws IOException
    {
        String[] tableNames = Convert.toStrArray(tables);
        byte[] data = genTableService.downloadCode(tableNames);
        genCode(response, data);
    }

    /**
     * 生成zip文件
     */
    private void genCode(HttpServletResponse response, byte[] data) throws IOException
    {
        response.reset();
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition");
        response.setHeader("Content-Disposition", "attachment; filename=\"manton.zip\"");
        response.addHeader("Content-Length", "" + data.length);
        response.setContentType("application/octet-stream; charset=UTF-8");
        IOUtils.write(data, response.getOutputStream());
    }

    /**
     * 响应请求分页数据
     */
    @SuppressWarnings({ "rawtypes"})
    protected  TableDataInfo getDataTable(List<?> list)
    {
        TableDataInfo rspData = new TableDataInfo();
        rspData.setCode(HttpStatus.OK.value());
        rspData.setMsg("查询成功");
        rspData.setRows(list);
//        rspData.setTotal(page.getTotal());
        rspData.setTotal(0);
        return rspData;
    }

    /**
     * 生成指定表结构代码，支持多数据库。
     * @param response
     * @param tableName 表名，可以是精确的表名，如：s_ment，也可以是前缀，如：s_
     * @param isPrecision 是否精确查询（单表）
     * @param packageName
     * @throws IOException
     * @date 2024-02-20
     */
    @GetMapping("/batchDownloadGenCode")
    public void batchDownloadGenCode(HttpServletResponse response, String tableName, boolean isPrecision, String packageName) throws IOException{
        List<GenTable> list = this.metaDataService.queryDatabaseTableInfo(tableName, isPrecision, packageName, null, null, null);
        if(StringUtils.isEmptyList(list)){
            logger.error("未查找到任何表信息，无法生存代码，tableName={}", tableName);
            return;
        }
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ZipOutputStream zip = new ZipOutputStream(outputStream);
        for(GenTable table : list){
            VelocityInitializer.initVelocity();
            VelocityContext context = VelocityUtils.prepareContext(table);

            // 获取模板列表
            List<String> templates = VelocityUtils.getTemplateList(table.getTplCategory());
            for (String template : templates) {
                // 渲染模板
                StringWriter sw = new StringWriter();
                Template tpl = Velocity.getTemplate(template, CharsetKit.UTF_8);
                tpl.merge(context, sw);
                try {
                    // 添加到zip
                    zip.putNextEntry(new ZipEntry(VelocityUtils.getFileName(template, table)));
                    IOUtils.write(sw.toString(), zip, CharsetKit.UTF_8);
                    IOUtils.closeQuietly(sw);
                    zip.flush();
                    zip.closeEntry();
                }
                catch (IOException e) {
                    logger.error("渲染模板失败，表名：" + table.getTableName(), e);
                }
            }
        }
        IOUtils.closeQuietly(zip);
        byte[] data = outputStream.toByteArray();
        genCode(response, data);
    }
}