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

using System.Collections.Immutable;

namespace Microsoft.DotNet.Watch;

internal static class BuildUtilities
{
    // Parses name=value pairs passed to --property. Skips invalid input.
    public static IEnumerable<(string key, string value)> ParseBuildProperties(IEnumerable<string> arguments)
        => from argument in arguments
           let colon = argument.IndexOf(':')
           where colon >= 0 && argument[0..colon] is "--property" or "-property" or "/property" or "/p" or "-p" or "--p"
           let eq = argument.IndexOf('=', colon)
           where eq >= 0
           let name = argument[(colon + 1)..eq].Trim()
           let value = argument[(eq + 1)..]
           where name is not []
           select (name, value);

    public static ImmutableDictionary<string, string> ParseBuildPropertiesToImmutableDictionary(IEnumerable<string> arguments)
    {
        var properties = ImmutableDictionary.CreateBuilder<string, string>(StringComparer.OrdinalIgnoreCase);
        foreach (var (key, value) in ParseBuildProperties(arguments))
        {
            properties[key] = value;
        }

        return properties.ToImmutable();
    }
}