namespace WebApi.Controllers;

[ApiController]
[Route("api/[controller]/[action]")]
public class BudgetController(
    IBudgetService budgetService,
    IBudgetRepository budgetRepository,
    ILogger<BudgetController> logger) : ControllerBase
{
    /// <summary>
    /// 获取预算列表
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<BudgetResult>>> GetListAsync([FromQuery] DateTime? referenceDate = null)
    {
        try
        {
            return (await budgetService.GetListAsync(referenceDate))
                .OrderBy(b => b.IsStopped)
                .OrderBy(b => b.Category)
                .ThenBy(b => b.Type)
                .ThenByDescending(b => b.Limit > 0 ? b.Current / b.Limit : 0)
                .ThenBy(b => b.Name)
                .ToList()
                .Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取预算列表失败");
            return $"获取预算列表失败: {ex.Message}".Fail<List<BudgetResult>>();
        }
    }

    /// <summary>
    /// 获取单个预算统计信息
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<BudgetResult>> GetStatisticsAsync([FromQuery] long id, [FromQuery] DateTime referenceDate)
    {
        try
        {
            // 参数验证
            if (id == 0)
            {
                return "预算 Id 无效".Fail<BudgetResult>();
            }

            var result = await budgetService.GetStatisticsAsync(id, referenceDate);

            if (result == null)
            {
                return "预算不存在".Fail<BudgetResult>();
            }

            return result.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取预算统计失败, Id: {Id}", id);
            return $"获取预算统计失败: {ex.Message}".Fail<BudgetResult>();
        }
    }

    /// <summary>
    /// 获取分类统计信息（月度和年度）
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<BudgetCategoryStats>> GetCategoryStatsAsync([FromQuery] BudgetCategory category, [FromQuery] DateTime? referenceDate = null)
    {
        try
        {
            var result = await budgetService.GetCategoryStatsAsync(category, referenceDate);
            return result.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取分类统计失败, Category: {Category}", category);
            return $"获取分类统计失败: {ex.Message}".Fail<BudgetCategoryStats>();
        }
    }

    /// <summary>
    /// 删除预算
    /// </summary>
    [HttpDelete("{id}")]
    public async Task<BaseResponse> DeleteByIdAsync(long id)
    {
        try
        {
            var success = await budgetRepository.DeleteAsync(id);
            return success ? BaseResponse.Done() : "删除预算失败".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "删除预算失败, Id: {Id}", id);
            return $"删除预算失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 创建预算
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse<long>> CreateAsync([FromBody] CreateBudgetDto dto)
    {
        try
        {
            var budget = new BudgetRecord
            {
                Name = dto.Name,
                Type = dto.Type,
                Limit = dto.Limit,
                Category = dto.Category,
                SelectedCategories = dto.SelectedCategories != null ? string.Join(",", dto.SelectedCategories) : string.Empty,
                StartDate = dto.StartDate ?? DateTime.Now
            };

            var varidationError = await ValidateBudgetSelectedCategoriesAsync(budget);
            if (!string.IsNullOrEmpty(varidationError))
            {
                return varidationError.Fail<long>();
            }

            var success = await budgetRepository.AddAsync(budget);
            if (success)
            {
                return budget.Id.Ok();
            }
            return "创建预算失败".Fail<long>();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "创建预算失败");
            return $"创建预算失败: {ex.Message}".Fail<long>();
        }
    }

    /// <summary>
    /// 更新预算
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> UpdateAsync([FromBody] UpdateBudgetDto dto)
    {
        try
        {
            var budget = await budgetRepository.GetByIdAsync(dto.Id);
            if (budget == null) return "预算不存在".Fail();

            budget.Name = dto.Name;
            budget.Type = dto.Type;
            budget.Limit = dto.Limit;
            budget.Category = dto.Category;
            budget.SelectedCategories = dto.SelectedCategories != null ? string.Join(",", dto.SelectedCategories) : string.Empty;
            budget.IsStopped = dto.IsStopped;
            if (dto.StartDate.HasValue)
            {
                budget.StartDate = dto.StartDate.Value;
            }

            var varidationError = await ValidateBudgetSelectedCategoriesAsync(budget);
            if (!string.IsNullOrEmpty(varidationError))
            {
                return varidationError.Fail();
            }

            var success = await budgetRepository.UpdateAsync(budget);
            return success ? BaseResponse.Done() : "更新预算失败".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "更新预算失败, Id: {Id}", dto.Id);
            return $"更新预算失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 切换预算暂停状态
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> ToggleStopAsync([FromQuery] long id)
    {
        try
        {
            var budget = await budgetRepository.GetByIdAsync(id);

            if (budget == null)
            {
                return "预算不存在".Fail();
            }

            budget.IsStopped = !budget.IsStopped;

            var success = await budgetRepository.UpdateAsync(budget);
            return success ? BaseResponse.Done() : "操作失败".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "切换预算状态失败, Id: {Id}", id);
            return $"操作失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 归档预算
    /// </summary>
    [HttpPost("{year}/{month}")]
    public async Task<BaseResponse> ArchiveBudgetsAsync(int year, int month)
    {
        try
        {
            var msg = await budgetService.ArchiveBudgetsAsync(year, month);

            if (!string.IsNullOrEmpty(msg))
            {
                return msg.Fail();
            }

            return BaseResponse.Done();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "归档预算失败, 归档日期: {Year}-{Month}", year, month);
            return $"归档预算失败: {ex.Message}".Fail();
        }
    }

    private async Task<string> ValidateBudgetSelectedCategoriesAsync(BudgetRecord record)
    {
        var allBudgets = await budgetRepository.GetAllAsync();

        var recordSelectedCategories = record.SelectedCategories.Split(',', StringSplitOptions.RemoveEmptyEntries);
        foreach (var budget in allBudgets)
        {
            var selectedCategories = budget.SelectedCategories.Split(',', StringSplitOptions.RemoveEmptyEntries);
            if (budget.Id != record.Id)
            {
                if (budget.Category == record.Category &&
                    recordSelectedCategories.Intersect(selectedCategories).Any())
                {
                    return $"和 {budget.Name} 存在分类冲突，请调整相关分类。";
                }
            }
        }

        return string.Empty;
    }
}