using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Newtonsoft.Json;

namespace Prophet.CoopWithDsh
{
    internal sealed class OpenDocument
    {
        [JsonProperty("path")] public string Path { get; set; } = string.Empty;
        [JsonProperty("label")] public string Label { get; set; } = string.Empty;
        [JsonProperty("dirty")] public bool Dirty { get; set; }
    }

    internal sealed class OpenFileSnapshot
    {
        [JsonProperty("version")] public int Version { get; set; } = 1;
        [JsonProperty("instanceId")] public string InstanceId { get; set; } = string.Empty;
        [JsonProperty("ide")] public string Ide { get; set; } = "visualstudio";
        [JsonProperty("processId")] public int ProcessId { get; set; }
        [JsonProperty("workspace", NullValueHandling = NullValueHandling.Ignore)] public string? Workspace { get; set; }
        [JsonProperty("updatedAt")] public string UpdatedAt { get; set; } = string.Empty;
        [JsonProperty("documents")] public IReadOnlyList<OpenDocument> Documents { get; set; } = Array.Empty<OpenDocument>();
    }

    internal static class SnapshotModel
    {
        internal static OpenFileSnapshot Create(string instanceId, int processId, string? workspace, IEnumerable<OpenDocument> documents, DateTimeOffset now)
        {
            var deduplicated = new Dictionary<string, OpenDocument>(StringComparer.OrdinalIgnoreCase);
            foreach (var document in documents.Where(d => !string.IsNullOrWhiteSpace(d.Path) && Path.IsPathRooted(d.Path)))
            {
                if (!deduplicated.TryGetValue(document.Path, out var current) || (!current.Dirty && document.Dirty))
                    deduplicated[document.Path] = document;
            }
            return new OpenFileSnapshot
            {
                InstanceId = instanceId,
                ProcessId = processId,
                Workspace = string.IsNullOrWhiteSpace(workspace) ? null : workspace,
                UpdatedAt = now.UtcDateTime.ToString("O"),
                Documents = deduplicated.Values.OrderBy(d => d.Label, StringComparer.OrdinalIgnoreCase).ThenBy(d => d.Path, StringComparer.OrdinalIgnoreCase).ToArray(),
            };
        }
    }
}