using System.Text.Json;
using Autodesk.AutoCAD.ApplicationServices;
using PRecAnnot.Abstractions;

namespace PRecAnnot.Plant3D2026;

internal sealed record LineConnectionApplyPermit
{
    public required bool AllowApply { get; init; }
    public required string FixtureMarkerPath { get; init; }
    public required string ExpectedViewportStableId { get; init; }
    public required IReadOnlyList<string> ExpectedConnectorStableIds { get; init; }
}

internal static class LineConnectionApplyPermitReader
{
    private const string MarkerContent = "P_REC_ANNOT_TEST_FIXTURE=LINE_CONNECTION_APPLY";

    public static LineConnectionApplyPermit Read()
    {
        var path = Environment.GetEnvironmentVariable("P_REC_ANNOT_LINE_CONNECTION_APPLY_PERMIT_PATH");
        if (string.IsNullOrWhiteSpace(path) || !Path.IsPathFullyQualified(path) || path.StartsWith("\\\\", StringComparison.Ordinal) || !File.Exists(path))
            throw new InvalidOperationException("LINE_CONNECTION_APPLY_PERMIT_REQUIRED");
        return JsonSerializer.Deserialize<LineConnectionApplyPermit>(File.ReadAllText(path), new JsonSerializerOptions { PropertyNameCaseInsensitive = true })
            ?? throw new InvalidOperationException("LINE_CONNECTION_APPLY_PERMIT_INVALID");
    }

    public static void Validate(Document document, LineConnectionApplyPermit permit, string viewportId, IReadOnlyList<LineConnectionBoundaryPlan> plans)
    {
        var actual = plans.Where(plan => plan.Reasons.Count == 0).Select(plan => plan.StableId).OrderBy(value => value, StringComparer.Ordinal).ToArray();
        var expected = permit.ExpectedConnectorStableIds.OrderBy(value => value, StringComparer.Ordinal).ToArray();
        if (!permit.AllowApply || !string.Equals(permit.ExpectedViewportStableId, viewportId, StringComparison.Ordinal) || !actual.SequenceEqual(expected, StringComparer.Ordinal))
            throw new InvalidOperationException("LINE_CONNECTION_APPLY_PERMIT_PLAN_MISMATCH");
        if (!Path.IsPathFullyQualified(permit.FixtureMarkerPath) || permit.FixtureMarkerPath.StartsWith("\\\\", StringComparison.Ordinal) || !File.Exists(permit.FixtureMarkerPath) || !string.Equals(File.ReadAllText(permit.FixtureMarkerPath).Trim(), MarkerContent, StringComparison.Ordinal))
            throw new InvalidOperationException("LINE_CONNECTION_APPLY_TEST_FIXTURE_REQUIRED");
        var root = Path.GetDirectoryName(Path.GetFullPath(permit.FixtureMarkerPath))! + Path.DirectorySeparatorChar;
        if (!Path.GetFullPath(document.Name).StartsWith(root, StringComparison.OrdinalIgnoreCase)) throw new InvalidOperationException("LINE_CONNECTION_APPLY_TEST_FIXTURE_REQUIRED");
    }
}