using Microsoft.Extensions.Options;
using DramaLing.Api.Models.Configuration;

namespace DramaLing.Api.Models.Configuration;

public class GeminiOptionsValidator : IValidateOptions<GeminiOptions>
{
    public ValidateOptionsResult Validate(string? name, GeminiOptions options)
    {
        var failures = new List<string>();

        if (string.IsNullOrWhiteSpace(options.ApiKey))
            failures.Add("Gemini API key is required");

        if (options.ApiKey?.StartsWith("AIza") != true)
            failures.Add("Gemini API key format is invalid (should start with 'AIza')");

        if (options.TimeoutSeconds <= 0 || options.TimeoutSeconds > 120)
            failures.Add("Timeout must be between 1 and 120 seconds");

        if (options.MaxRetries <= 0 || options.MaxRetries > 10)
            failures.Add("Max retries must be between 1 and 10");

        if (options.Temperature < 0 || options.Temperature > 2)
            failures.Add("Temperature must be between 0 and 2");

        if (string.IsNullOrWhiteSpace(options.Model))
            failures.Add("Model name is required");

        if (string.IsNullOrWhiteSpace(options.BaseUrl) || !Uri.IsWellFormedUriString(options.BaseUrl, UriKind.Absolute))
            failures.Add("Base URL must be a valid absolute URL");

        return failures.Any()
            ? ValidateOptionsResult.Fail(failures)
            : ValidateOptionsResult.Success;
    }
}