using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using ClosedXML.Excel;
using FastReport;
using FastReport.Export.OoXML;
using FastReport.Export.Pdf;
using Microsoft.AspNetCore.Mvc;
using rmutr_report.Models;
using Swashbuckle.AspNetCore.Annotations;

namespace rmutr_report.Controllers
{
    [SwaggerTag("สำหรับรายงานค่าใช้จ่ายในการดำเนินงาน")]
    public class Expenses : Controller
    {
        readonly Setting _setting;

        public Expenses(Setting setting)
        {
            this._setting = setting;
        }

        /// <summary>ระดับชั้นของแต่ละแถว อนุมานจาก "no" (จำนวนจุด) หรือ prefix ของ expenditure_budget
        /// เมื่อไม่มี "no" — ใช้กำหนดว่าแถวไหนเป็นแถวสรุปยอด (มีลูก) ต้องใส่สูตรรวม แทนตัวเลขคงที่</summary>
        private static int GetDepth(operating_expenses_detail item)
        {
            if (!string.IsNullOrEmpty(item.no)) return item.no.Count(c => c == '.');
            if (item.expenditure_budget != null && item.expenditure_budget.StartsWith("    - ")) return 4;
            if (item.expenditure_budget != null && item.expenditure_budget.StartsWith(" - ")) return 3;
            return 0;
        }

        [HttpPost, Route("reports/operating_expenses/{type}")]
        [ApiExplorerSettings(GroupName = "reports")]
        public IActionResult GetExpensesReport([FromRoute] string type,
            [FromBody] operating_expenses _operating_expenses)
        {
            switch (type)
            {
                case "xls":
                case "xlsx":
                {
                    using var workbook = new XLWorkbook();
                    var ws = workbook.Worksheets.Add("ค่าใช้จ่ายดำเนินงาน");

                    ws.Column(1).Width = 11.03;
                    ws.Column(2).Width = 83.48;
                    ws.Column(3).Width = 26.77;
                    ws.Column(4).Width = 61.42;

                    void TitleRow(int row, string text, bool rightAlign = false)
                    {
                        var range = ws.Range(row, 1, row, 4).Merge();
                        range.Value = text;
                        range.Style.Font.FontName = "TH Sarabun New";
                        range.Style.Font.FontSize = 16;
                        range.Style.Font.Bold = true;
                        range.Style.Alignment.WrapText = true;
                        range.Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
                        range.Style.Alignment.Horizontal = rightAlign
                            ? XLAlignmentHorizontalValues.Right
                            : XLAlignmentHorizontalValues.Center;
                    }

                    TitleRow(1, $"ปีงบประมาณ {_operating_expenses.budget_year} {_operating_expenses.plan}");
                    TitleRow(2, _operating_expenses.text);
                    TitleRow(3, $"{_operating_expenses.faculty_name_th} {_operating_expenses.budget_location_name_th}");
                    TitleRow(4, $"หน่วย : {_operating_expenses.total_amount:N0} บาท", rightAlign: true);
                    // แถว 5 เว้นว่างไว้ (ตามรูปแบบรายงานเดิม)

                    const int headerRow = 6;
                    var headers = new[]
                    {
                        "ลำดับที่", "งบรายจ่าย", $"คำขอตั้ง\nปี {_operating_expenses.request_year}", "สรุปคำชี้แจง"
                    };
                    for (var col = 1; col <= 4; col++)
                    {
                        var cell = ws.Cell(headerRow, col);
                        cell.Value = headers[col - 1];
                        cell.Style.Font.FontName = "TH Sarabun New";
                        cell.Style.Font.FontSize = 16;
                        cell.Style.Font.Bold = true;
                        cell.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                        cell.Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
                        cell.Style.Alignment.WrapText = true;
                        cell.Style.Border.OutsideBorder = XLBorderStyleValues.Thin;
                        cell.Style.Border.InsideBorder = XLBorderStyleValues.Thin;
                    }

                    var data = _operating_expenses.data ?? new List<operating_expenses_detail>();
                    var depths = data.Select(GetDepth).ToList();
                    var startRow = headerRow + 1;

                    for (var i = 0; i < data.Count; i++)
                    {
                        var row = startRow + i;
                        var item = data[i];
                        var depth = depths[i];

                        // ลูกโดยตรง = แถวถัดไปที่ลึกกว่าพอดี 1 ชั้น หยุดเมื่อเจอแถวที่ลึกเท่ากันหรือตื้นกว่า
                        var childRows = new List<int>();
                        for (var j = i + 1; j < data.Count && depths[j] > depth; j++)
                        {
                            if (depths[j] == depth + 1) childRows.Add(startRow + j);
                        }

                        ws.Cell(row, 1).Value = item.no;
                        ws.Cell(row, 2).Value = item.expenditure_budget;
                        if (childRows.Any())
                        {
                            ws.Cell(row, 3).FormulaA1 = "=" + string.Join("+", childRows.Select(r => $"C{r}"));
                        }
                        else
                        {
                            ws.Cell(row, 3).Value = item.amount ?? 0;
                        }
                        ws.Cell(row, 4).Value = item.clarification_summary;

                        var range = ws.Range(row, 1, row, 4);
                        range.Style.Font.FontName = "TH Sarabun New";
                        range.Style.Font.FontSize = 14;
                        range.Style.Alignment.WrapText = true;
                        range.Style.Alignment.Vertical = XLAlignmentVerticalValues.Center;
                        range.Style.Border.OutsideBorder = XLBorderStyleValues.Thin;
                        range.Style.Border.InsideBorder = XLBorderStyleValues.Thin;

                        ws.Cell(row, 1).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
                        ws.Cell(row, 2).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Left;
                        ws.Cell(row, 3).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Right;
                        ws.Cell(row, 3).Style.NumberFormat.Format = "#,##0_);(#,##0)";
                        ws.Cell(row, 4).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Left;
                    }

                    using var xlsStream = new MemoryStream();
                    workbook.SaveAs(xlsStream);
                    xlsStream.Seek(0, SeekOrigin.Begin);
                    var xlsDate = DateTime.Now.ToString("yyyyMMddHHmmss");
                    return File(
                        xlsStream.ToArray(),
                        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                        "operating_expenses_" + xlsDate + ".xlsx");
                }
                case "pdf":
                case "doc":
                case "docx":
                {
                    var _operating_expensess = new List<operating_expenses>() { _operating_expenses };

                    Report report = new Report();
                    report.Load(_setting.report_path + "operating_expenses.frx");
                    report.RegisterData(_operating_expensess, "operating_expenses");
                    report.Prepare();

                    MemoryStream stream = new MemoryStream();
                    if (type == "pdf")
                    {
                        PDFExport pdf = new PDFExport();
                        report.Export(pdf, stream);
                        stream.Seek(0, SeekOrigin.Begin);
                        return File(stream, "application/pdf");
                    }
                    else
                    {
                        Word2007Export word = new Word2007Export();
                        report.Export(word, stream);
                        stream.Seek(0, SeekOrigin.Begin);
                        return File(stream, "appllication/vnd.ms-word");
                    }
                }
            }

            return Ok();
        }
    }
}