// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

#nullable disable

namespace Microsoft.DotNet.Cli.Commands.Workload;

internal static class WorkloadHistoryDisplay
{
    public class DisplayRecord
    {
        public int? ID { get; set; }
        public DateTimeOffset? TimeStarted { get; set; }
        public string Command { get; set; }
        public List<string> Workloads { get; set; }
        public string GlobalJsonVersion { get; set; }

        public WorkloadHistoryState HistoryState { get; set; }
    }

    public static List<DisplayRecord> ProcessWorkloadHistoryRecords(IEnumerable<WorkloadHistoryRecord> historyRecords, out bool unknownRecordsPresent)
    {
        List<DisplayRecord> displayRecords = [];
        unknownRecordsPresent = false;

        int currentId = 2;

        foreach (var historyRecord in historyRecords.OrderBy(r => r.TimeStarted))
        {
            if (displayRecords.Any() && !historyRecord.StateBeforeCommand.Equals(displayRecords.Last()?.HistoryState))
            {
                //  Workload state changed without history record being written
                var unknownDisplayRecord = new DisplayRecord()
                {
                    Command = "Unlogged Changes",
                    ID = currentId,
                    TimeStarted = null,
                    HistoryState = historyRecord.StateBeforeCommand
                };

                currentId++;
                displayRecords.Add(unknownDisplayRecord);
                unknownRecordsPresent = true;
            }

            displayRecords.Add(new DisplayRecord()
            {
                ID = currentId,
                TimeStarted = historyRecord.TimeStarted,
                Command = historyRecord.CommandName,
                GlobalJsonVersion = historyRecord.GlobalJsonVersion,
                HistoryState = historyRecord.StateAfterCommand
            });

            currentId++;
        }

        if (displayRecords.Count > 0)
        {
            displayRecords.Insert(0, new DisplayRecord()
            {
                TimeStarted = DateTimeOffset.MinValue,
                ID = 1,
                Command = "InitialState",
                HistoryState = historyRecords.First().StateBeforeCommand
            });
        }

        return displayRecords;
    }
}