package admin

import (
	"github.com/gofiber/fiber/v2"

	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	"github.com/break/junhong_cmp_fiber/internal/service/polling"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
	"github.com/break/junhong_cmp_fiber/pkg/response"
)

// PollingConcurrencyHandler 轮询并发控制处理器
type PollingConcurrencyHandler struct {
	service *polling.ConcurrencyService
}

// NewPollingConcurrencyHandler 创建轮询并发控制处理器
func NewPollingConcurrencyHandler(service *polling.ConcurrencyService) *PollingConcurrencyHandler {
	return &PollingConcurrencyHandler{service: service}
}

// List 获取所有并发配置
// @Summary 获取轮询并发配置列表
// @Description 获取所有轮询任务类型的并发配置及当前状态
// @Tags 轮询管理-并发控制
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {object} response.Response{data=dto.PollingConcurrencyListResp}
// @Router /api/admin/polling-concurrency [get]
func (h *PollingConcurrencyHandler) List(c *fiber.Ctx) error {
	ctx := c.UserContext()

	statuses, err := h.service.List(ctx)
	if err != nil {
		return err
	}

	items := make([]*dto.PollingConcurrencyResp, 0, len(statuses))
	for _, s := range statuses {
		items = append(items, &dto.PollingConcurrencyResp{
			TaskType:       s.TaskType,
			TaskTypeName:   s.TaskTypeName,
			MaxConcurrency: s.MaxConcurrency,
			Current:        s.Current,
			Available:      s.Available,
			Utilization:    s.Utilization,
		})
	}

	return response.Success(c, &dto.PollingConcurrencyListResp{Items: items})
}

// Get 获取指定任务类型的并发配置
// @Summary 获取指定任务类型的并发配置
// @Description 获取指定轮询任务类型的并发配置及当前状态
// @Tags 轮询管理-并发控制
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param task_type path string true "任务类型"
// @Success 200 {object} response.Response{data=dto.PollingConcurrencyResp}
// @Router /api/admin/polling-concurrency/{task_type} [get]
func (h *PollingConcurrencyHandler) Get(c *fiber.Ctx) error {
	ctx := c.UserContext()
	taskType := c.Params("task_type")

	if taskType == "" {
		return errors.New(errors.CodeInvalidParam, "任务类型不能为空")
	}

	status, err := h.service.GetByTaskType(ctx, taskType)
	if err != nil {
		return err
	}

	return response.Success(c, &dto.PollingConcurrencyResp{
		TaskType:       status.TaskType,
		TaskTypeName:   status.TaskTypeName,
		MaxConcurrency: status.MaxConcurrency,
		Current:        status.Current,
		Available:      status.Available,
		Utilization:    status.Utilization,
	})
}

// Update 更新并发配置
// @Summary 更新轮询并发配置
// @Description 更新指定轮询任务类型的最大并发数
// @Tags 轮询管理-并发控制
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param task_type path string true "任务类型"
// @Param request body dto.UpdatePollingConcurrencyReq true "更新请求"
// @Success 200 {object} response.Response
// @Router /api/admin/polling-concurrency/{task_type} [put]
func (h *PollingConcurrencyHandler) Update(c *fiber.Ctx) error {
	ctx := c.UserContext()
	taskType := c.Params("task_type")

	if taskType == "" {
		return errors.New(errors.CodeInvalidParam, "任务类型不能为空")
	}

	var req dto.UpdatePollingConcurrencyReq
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	userID := middleware.GetUserIDFromContext(ctx)
	if err := h.service.UpdateMaxConcurrency(ctx, taskType, req.MaxConcurrency, userID); err != nil {
		return err
	}

	return response.Success(c, nil)
}

// Reset 重置并发计数
// @Summary 重置轮询并发计数
// @Description 重置指定轮询任务类型的当前并发计数为0（用于信号量修复）
// @Tags 轮询管理-并发控制
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body dto.ResetPollingConcurrencyReq true "重置请求"
// @Success 200 {object} response.Response
// @Router /api/admin/polling-concurrency/reset [post]
func (h *PollingConcurrencyHandler) Reset(c *fiber.Ctx) error {
	ctx := c.UserContext()

	var req dto.ResetPollingConcurrencyReq
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam)
	}

	if req.TaskType == "" {
		return errors.New(errors.CodeInvalidParam, "任务类型不能为空")
	}

	if err := h.service.ResetConcurrency(ctx, req.TaskType); err != nil {
		return err
	}

	return response.Success(c, nil)
}