using System.Dynamic;
using System.Text.RegularExpressions;
using MES.Service.Dto.service;
using MES.Service.service.PLM;
using MES.Service.util;
using Microsoft.AspNetCore.Mvc;
using Oracle.ManagedDataAccess.Client;

namespace MESApplication.Controllers.PLM;

[ApiController]
[Route("api/PLM")]
public class PLMController : ControllerBase
{
    private readonly IConfiguration _configuration;
    private readonly PLMManager m = new();
    private readonly WarehouseDownloadDoc wdd = new();

    public PLMController(IConfiguration configuration)
    {
        _configuration = configuration;
    } // RetrieveDrawings 调取图纸

    [HttpPost("RetrieveDrawings")]
    public async Task<ResponseResult> RetrieveDrawings(PurchaseInventory dto)
    {
        try
        {
            dynamic resultInfos = new ExpandoObject();
            var retrieveDrawings =
                m.RetrieveDrawings(dto.ItemNo); // 自定义保存根目录
            // string saveRootDirectory = @"D:\LTSMES\PLM";                
            var saveRootDirectory = @"E:\SOPimage";
            var
                saveDirectory =
                    Path.Combine(saveRootDirectory,
                        dto.ItemNo); // 在循环处理所有 PDF 文件之前，如果该 itemNo 已存在表中，则进行删除操作
            await DeleteRecordsByItemNo(dto.ItemNo);
            // 在循环处理所有 PDF 文件之前，检查并删除旧文件夹（如果存在），然后重新创建
            if (Directory.Exists(saveDirectory))
                Directory.Delete(saveDirectory, true);

            Directory.CreateDirectory(saveDirectory);
            foreach (var retrieveDrawing in retrieveDrawings)
            {
                var streamFile = wdd.SendRequest("Download",
                    retrieveDrawing.FRelevantObject);
                var fileStreamResult = File(streamFile,
                    "application/octet-stream", retrieveDrawing.FName);
                var saveResult = await SavePdfAsync(fileStreamResult,
                    saveRootDirectory, dto.ItemNo, dto.Cx,
                    retrieveDrawing.FName);
            }

            return new ResponseResult
                { status = 0, message = "OK", data = resultInfos };
        }
        catch (Exception ex)
        {
            return ResponseResult.ResponseError(ex);
        }
    } // ✅ 直接保存 PDF，不再转换为图片

    private async Task<dynamic> SavePdfAsync(FileStreamResult fileStreamResult,
        string saveRootDirectory,
        string itemNo, string cx, string fPhysicalFileName)
    {
        try
        {
            // 确保目录存在
            var saveDirectory = Path.Combine(saveRootDirectory, itemNo);
            if (!Directory.Exists(saveDirectory))
                Directory.CreateDirectory(saveDirectory); // 保存 PDF 文件

            var outputFilePath = Path.Combine(saveDirectory,
                $"{Path.GetFileNameWithoutExtension(fPhysicalFileName)}.pdf");
            using (var fileStream = new FileStream(outputFilePath,
                       FileMode.Create, FileAccess.Write))
            {
                await fileStreamResult.FileStream.CopyToAsync(fileStream);
            }

            Console.WriteLine(
                $"PDF 文件已保存: {outputFilePath}"); // 生成新的 URL（指向 PDF 文件）
            var
                url =
                    $"http://192.168.1.92:89/{itemNo}/{Path.GetFileName(outputFilePath)}"; // 提取文件名中的最后一个'_'到'.pdf'之间的字母数字部分，并加上“工序”前缀
            var extractedNumber = ExtractNumberFromFileName(fPhysicalFileName);
            var
                process = string.IsNullOrEmpty(extractedNumber)
                    ? string.Empty
                    : $"工序{extractedNumber}"; // ✅ 插入数据库（URL 指向 PDF，并更新工序字段）
            await InsertUrlIntoDatabase(url, itemNo, cx, process);
            return new { PdfFilePath = outputFilePath };
        }
        catch (Exception ex)
        {
            Console.WriteLine($"PDF 保存失败: {ex.Message}");
            return new { ErrorMessage = "PDF 保存失败", Exception = ex.Message };
        }
    } // 提取文件名中的最后一个'_'到'.pdf'之间的字母数字部分，忽略括号等内容

    private string ExtractNumberFromFileName(string fileName)
    {
        // 使用正则表达式提取最后一个'_'到'.pdf'之间的字母数字部分，忽略括号等字符
        var match = Regex.Match(fileName, @"_([A-Za-z0-9]+)(?=\(?\.pdf$)");
        if (match.Success)
            // 如果匹配成功，返回提取的部分
            return match.Groups[1].Value;

        // 如果没有找到符合条件的部分，返回空字符串
        return string.Empty;
    } // 将 URL、itemNo、cx 和工序字段插入到数据库中 


    private async Task InsertUrlIntoDatabase(string url, string itemNo,
        string cx, string gx)
    {
        var connectionString = _configuration["AppSettings:DataBaseConn"];
        using (var connection = new OracleConnection(connectionString))
        {
            await connection.OpenAsync();
            var insertQuery =
                "INSERT INTO MES_SOP_URL_TABLE (id, URL, ITEM_NO, CX, GX, CREATE_DATE) VALUES (SEQ_SOP_URL.NEXTVAL, :url, :item_no, :cx, :gx, :create_date)";
            using (var insertCommand =
                   new OracleCommand(insertQuery, connection))
            {
                // 使用 Parameters.Add 方法添加参数
                insertCommand.Parameters.Add("url", OracleDbType.Varchar2)
                    .Value = url;
                insertCommand.Parameters.Add("item_no", OracleDbType.Varchar2)
                    .Value = itemNo;
                insertCommand.Parameters.Add("cx", OracleDbType.Varchar2)
                    .Value = cx;
                insertCommand.Parameters.Add("gx", OracleDbType.Varchar2)
                    .Value = gx;
                insertCommand.Parameters.Add("create_date", OracleDbType.Date)
                    .Value = DateTime.Now;
                await insertCommand.ExecuteNonQueryAsync();
            }
        }
    } // 删除指定 itemNo 的记录      

    private async Task DeleteRecordsByItemNo(string itemNo)
    {
        var connectionString = _configuration["AppSettings:DataBaseConn"];
        using (var connection = new OracleConnection(connectionString))
        {
            await connection.OpenAsync();
            var deleteQuery =
                "DELETE FROM MES_SOP_URL_TABLE WHERE ITEM_NO = :item_no";
            using (var deleteCommand =
                   new OracleCommand(deleteQuery, connection))
            {
                deleteCommand.Parameters.Add("item_no", OracleDbType.Varchar2)
                    .Value = itemNo;
                await deleteCommand.ExecuteNonQueryAsync();
            }
        }
    }
}