namespace Service.IconSearch;

public class IconSearchService(
    ISearchKeywordGeneratorService keywordGeneratorService,
    IIconifyApiService iconifyApiService,
    ITransactionCategoryRepository categoryRepository,
    ILogger<IconSearchService> logger
) : IIconSearchService
{
    public async Task<List<string>> GenerateSearchKeywordsAsync(string categoryName)
    {
        var keywords = await keywordGeneratorService.GenerateKeywordsAsync(categoryName);
        return keywords;
    }

    public async Task<List<IconCandidate>> SearchIconsAsync(List<string> keywords, int limit = 20)
    {
        if (keywords == null || keywords.Count == 0)
        {
            logger.LogWarning("搜索关键字为空");
            return [];
        }

        var icons = await iconifyApiService.SearchIconsAsync(keywords, limit);
        logger.LogInformation("搜索到 {Count} 个图标候选", icons.Count);
        return icons;
    }

    public async Task UpdateCategoryIconAsync(long categoryId, string iconIdentifier)
    {
        if (string.IsNullOrWhiteSpace(iconIdentifier))
        {
            throw new ArgumentException("图标标识符不能为空", nameof(iconIdentifier));
        }

        var category = await categoryRepository.GetByIdAsync(categoryId);
        if (category == null)
        {
            throw new Exception($"分类不存在，ID：{categoryId}");
        }

        category.Icon = iconIdentifier;
        category.IconKeywords = null;
        await categoryRepository.UpdateAsync(category);

        logger.LogInformation("更新分类 {CategoryId} 的图标为 {IconIdentifier}", categoryId, iconIdentifier);
    }
}