using FeMM.Grasshopper.Helpers;
using Grasshopper.Kernel;
using St7API;
using System;
using System.Collections.Generic;
using System.Text;

namespace FeMM.Grasshopper.Components.ST2R
{
    public class St7ReadResultCasesComponent : GH_Component
    {
        private bool _run = false;

        public St7ReadResultCasesComponent()
            : base("Read Load Cases Names", "ReadLoadCasesNames",
                  "Reads the names of load cases from the result file",
                  CategoryNameConstants.CATEGORY_F2R, CategoryNameConstants.SUBCATEGORY_ST2R_BAKE)
        {
        }

        public override void CreateAttributes()
        {
            var buttonAttributes = new ComponentAttributes.ComponentOneButtonAttributes(this, "Read");
            buttonAttributes.ButtonPressed += () =>
            {
                _run = true;
                ExpireSolution(true);
            };
            m_attributes = buttonAttributes;
        }

        protected override void RegisterInputParams(GH_InputParamManager p)
        {
            p.AddIntegerParameter("uID", "ID", "uID of the already opened Straus7 model", GH_ParamAccess.item);
            p.AddTextParameter("Result File", "Res", "Full path to the .RST / .NLA / .NLF result file", GH_ParamAccess.item);
        }

        protected override void RegisterOutputParams(GH_OutputParamManager p)
        {
            p.AddTextParameter("Case Names", "Names", "Result case names", GH_ParamAccess.list);
            p.AddTextParameter("Log", "Log", "Debug log messages", GH_ParamAccess.list);
        }

        protected override void SolveInstance(IGH_DataAccess DA)
        {
            int uID = 0;
            string resultFile = "";

            if (!DA.GetData(0, ref uID)) return;
            if (!DA.GetData(1, ref resultFile)) return;

            List<string> caseNames = [];
            List<string> log = [];

            if (!_run)
            {
                DA.SetDataList(0, caseNames);
                DA.SetDataList(1, log);
                return;
            }

            log.Add($"Reading result cases from model uID = {uID}");
            log.Add($"Opening result file: {resultFile}");

            // --------------------------
            // Open result file
            // --------------------------
            int numPrimary = 0, numSecondary = 0;
            int err = St7.St7OpenResultFile(uID, resultFile, null, St7.kNoCombinations, ref numPrimary, ref numSecondary);

            if (err != St7.ERR7_NoError)
            {
                log.Add($"Error opening result file (code {err})");
                DA.SetDataList(0, caseNames);
                DA.SetDataList(1, log);
                _run = false;
                return;
            }

            log.Add($"Result file opened. Primary={numPrimary}, Secondary={numSecondary}");

            // --------------------------
            // Read result cases
            // --------------------------
            int caseNum = 1;
            while (true)
            {
                StringBuilder name = new(256);
                err = St7.St7GetResultCaseName(uID, caseNum, name, name.Capacity);

                if (err != St7.ERR7_NoError)
                {
                    log.Add($"Stopped reading cases at index {caseNum} (API returned code {err})");
                    break;
                }

                caseNames.Add(name.ToString().TrimEnd('\0'));
                log.Add($"Found case {caseNum}: {name}");

                caseNum++;
            }

            if (caseNames.Count == 0)
                log.Add("No result cases found.");

            DA.SetDataList(0, caseNames);
            DA.SetDataList(1, log);

            _run = false;
        }

        protected override System.Drawing.Bitmap Icon => Properties.Resources.St7ReadResultCasesIcon;

        public override Guid ComponentGuid => new("5f7d1c2b-4e8b-4cbb-b2a0-123456789abc");
    }
}