namespace Eis.Infrastructure.Candidate;

public sealed record CandidateMigrationOptions(bool NativeEnabled)
{
    public static CandidateMigrationOptions FromEnvironment(
        bool configuredNativeEnabled,
        bool authenticationNativeEnabled,
        bool sharesLegacySessions)
    {
        var enabled = ParseBoolean(
            Environment.GetEnvironmentVariable("CANDIDATE_NATIVE_ENABLED"),
            configuredNativeEnabled);
        if (enabled && !authenticationNativeEnabled)
        {
            throw new InvalidOperationException(
                "启用原生考生接口前必须同时设置 AUTH_NATIVE_ENABLED=true，以确保 ASP.NET Core 能识别登录会话");
        }

        var allowMemoryForIsolatedTesting = ParseBoolean(
            Environment.GetEnvironmentVariable("CANDIDATE_NATIVE_ALLOW_MEMORY"),
            fallback: false);
        if (enabled && !sharesLegacySessions && !allowMemoryForIsolatedTesting)
        {
            throw new InvalidOperationException(
                "应用仍有受保护接口需要转发给 Node；启用原生考生接口必须配置共享 Redis 会话");
        }

        return new CandidateMigrationOptions(enabled);
    }

    private static bool ParseBoolean(string? value, bool fallback) => value?.Trim().ToLowerInvariant() switch
    {
        "1" or "true" or "yes" or "on" => true,
        "0" or "false" or "no" or "off" => false,
        _ => fallback
    };
}