ForgejoReleaseSync/Services/AppConfig.cs

using DotNetEnv;

namespace ForgejoReleaseSync.Services;

public class AppConfig
{
    public required string ForgejoInstacne { get; set; }
    public required string ForgejoToken { get; set; }
    public required ushort SyncConcurrency { get; set; }
    public required string RepositoryConfigFilePath  { get; set; }
}


public static class AppConfigLoader
{
    public static AppConfig LoadConfigFromEnv()
    {
        Env.Load();

        var forgejoInstance = Environment.GetEnvironmentVariable("FORGEJO_INSTANCE");
        var forgejoToken = Environment.GetEnvironmentVariable("FORGEJO_TOKEN");
        var syncConcurrency = Environment.GetEnvironmentVariable("SYNC_CONCURRENCY");
        var repoConfigFilePath = Environment.GetEnvironmentVariable("REPO_CONFIG_FILE");

        if (string.IsNullOrEmpty(forgejoInstance))
            throw new Exception("FORGEJO_INSTANCE environment variable is required");
        if (!string.IsNullOrEmpty(forgejoToken) && forgejoInstance.EndsWith('/'))
            forgejoInstance = forgejoInstance[..^1];

        if (string.IsNullOrEmpty(forgejoToken))
            throw new Exception("FORGEJO_TOKEN environment variable is required");

        ushort syncConcurrencyParsed = 3;
        if (!string.IsNullOrEmpty(syncConcurrency))
            ushort.TryParse(syncConcurrency, out syncConcurrencyParsed);
        if (syncConcurrencyParsed > 10)
            throw new ArgumentOutOfRangeException(nameof(syncConcurrencyParsed),
                "Sync concurrency cannot be greater than 10");
        
        if (string.IsNullOrEmpty(repoConfigFilePath))
            throw new Exception("REPO_CONFIG_FILE environment variable is required");        


        return new AppConfig
        {
            ForgejoInstacne =  forgejoInstance,
            ForgejoToken = forgejoToken,
            SyncConcurrency = syncConcurrencyParsed,
            RepositoryConfigFilePath =  repoConfigFilePath
        };
    }
}