package admin

import (
	"github.com/go-playground/validator/v10"
	"github.com/gofiber/fiber/v2"

	"github.com/break/junhong_cmp_fiber/internal/handler/validation"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	prioritypollingquery "github.com/break/junhong_cmp_fiber/internal/query/prioritypolling"
	pollingSvc "github.com/break/junhong_cmp_fiber/internal/service/polling"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
	"github.com/break/junhong_cmp_fiber/pkg/response"
)

// PriorityPollingHandler 处理卡轮询优先队列的人工入口（入队、关闭、重触发）与只读查询请求。
type PriorityPollingHandler struct {
	manual    *pollingSvc.PriorityManualService
	query     *prioritypollingquery.Query
	validator *validator.Validate
}

// NewPriorityPollingHandler 创建卡轮询优先队列处理器。
func NewPriorityPollingHandler(
	manual *pollingSvc.PriorityManualService,
	query *prioritypollingquery.Query,
	validator *validator.Validate,
) *PriorityPollingHandler {
	return &PriorityPollingHandler{manual: manual, query: query, validator: validator}
}

// Enqueue 人工优先入队。
// POST /api/admin/polling-priority-items
func (h *PriorityPollingHandler) Enqueue(c *fiber.Ctx) error {
	if h.manual == nil {
		return errors.New(errors.CodeInternalError, "人工优先入队能力未配置")
	}
	var req dto.EnqueuePriorityPollingRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数格式不正确")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, validation.Message("人工优先入队参数不合法", &req, err))
	}
	result, err := h.manual.Enqueue(c.UserContext(), req.CardID, req.Reason, middleware.GetUserIDFromContext(c.UserContext()))
	if err != nil {
		return err
	}
	taskTypeNames := make([]string, 0, len(result.TaskTypes))
	items := make([]dto.EnqueuePriorityPollingItemView, 0, len(result.Items))
	for _, taskType := range result.TaskTypes {
		taskTypeNames = append(taskTypeNames, constants.PollingPriorityTaskTypeName(taskType))
	}
	for _, item := range result.Items {
		items = append(items, dto.EnqueuePriorityPollingItemView{
			ItemID:          item.ItemID,
			TaskType:        item.TaskType,
			TaskTypeName:    constants.PollingPriorityTaskTypeName(item.TaskType),
			Status:          item.Status,
			StatusName:      constants.PollingPriorityStatusName(item.Status),
			TriggerCount:    item.TriggerCount,
			LastTriggeredAt: item.LastTriggeredAt,
			Created:         item.Created,
		})
	}
	return response.Success(c, dto.EnqueuePriorityPollingResponse{
		CardID:        result.CardID,
		TaskTypes:     result.TaskTypes,
		TaskTypeNames: taskTypeNames,
		CreatedCount:  result.CreatedCount,
		MergedCount:   result.MergedCount,
		Items:         items,
	})
}

// Close 人工关闭未完成的优先轮询项。
// 只允许超级管理员与平台账号；原因必填并写入审计，关闭后不再发起上游调用且保留既有执行结果与失败原因。
// POST /api/admin/polling-priority-items/:id/close
func (h *PriorityPollingHandler) Close(c *fiber.Ctx) error {
	if h.manual == nil {
		return errors.New(errors.CodeInternalError, "人工关闭优先轮询项能力未配置")
	}
	id, err := pathID(c)
	if err != nil {
		return err
	}
	var req dto.ClosePriorityPollingItemRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数格式不正确")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, validation.Message("人工关闭优先轮询项参数不合法", &req, err))
	}
	result, err := h.manual.Close(c.UserContext(), id, req.Reason, middleware.GetUserIDFromContext(c.UserContext()))
	if err != nil {
		return err
	}
	return response.Success(c, dto.ClosePriorityPollingItemResponse{
		ItemID:       result.ItemID,
		CardID:       result.CardID,
		TaskType:     result.TaskType,
		TaskTypeName: constants.PollingPriorityTaskTypeName(result.TaskType),
		Status:       result.Status,
		StatusName:   constants.PollingPriorityStatusName(result.Status),
		DequeuedAt:   result.DequeuedAt,
		Reason:       result.Reason,
	})
}

// Retrigger 人工重触发失败出队或已过期的优先轮询项。
// 复用人工入队入口为该卡该任务类型建立新的活动项（尝试次数从零开始），原因必填并写入审计；
// 权限与人工入队一致（含数据范围内的代理账号），不绕过活动项唯一键代表的并发上限。
// POST /api/admin/polling-priority-items/:id/retrigger
func (h *PriorityPollingHandler) Retrigger(c *fiber.Ctx) error {
	if h.manual == nil {
		return errors.New(errors.CodeInternalError, "人工重触发优先轮询项能力未配置")
	}
	id, err := pathID(c)
	if err != nil {
		return err
	}
	var req dto.RetriggerPriorityPollingItemRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数格式不正确")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, validation.Message("人工重触发优先轮询项参数不合法", &req, err))
	}
	result, err := h.manual.Retrigger(c.UserContext(), id, req.Reason, middleware.GetUserIDFromContext(c.UserContext()))
	if err != nil {
		return err
	}
	view := dto.RetriggerPriorityPollingItemResponse{
		SourceItemID: result.SourceItemID,
		CardID:       result.Enqueue.CardID,
		Reason:       result.Reason,
	}
	if len(result.Enqueue.Items) > 0 {
		// 重触发只针对来源项的任务类型，因此结果里至多一项；防御性取首项。
		item := result.Enqueue.Items[0]
		view.TaskType = item.TaskType
		view.TaskTypeName = constants.PollingPriorityTaskTypeName(item.TaskType)
		view.ItemID = item.ItemID
		view.Status = item.Status
		view.StatusName = constants.PollingPriorityStatusName(item.Status)
		view.AttemptCount = item.AttemptCount
		view.TriggerCount = item.TriggerCount
		view.LastTriggeredAt = item.LastTriggeredAt
		view.Created = item.Created
	}
	return response.Success(c, view)
}

// ListPriorityItems 分页查询优先轮询项。
// GET /api/admin/polling-priority-items
func (h *PriorityPollingHandler) ListPriorityItems(c *fiber.Ctx) error {
	if h.query == nil {
		return errors.New(errors.CodeInternalError, "优先轮询项查询能力未配置")
	}
	var req dto.PriorityPollingItemListRequest
	if err := c.QueryParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}
	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, validation.Message("优先轮询项查询参数不合法", &req, err))
	}
	result, err := h.query.List(c.UserContext(), req)
	if err != nil {
		return err
	}
	return response.SuccessWithPagination(c, result.List, result.Total, result.Page, result.PageSize)
}

// GetPriorityItem 查询优先轮询项详情。
// GET /api/admin/polling-priority-items/:id
func (h *PriorityPollingHandler) GetPriorityItem(c *fiber.Ctx) error {
	if h.query == nil {
		return errors.New(errors.CodeInternalError, "优先轮询项查询能力未配置")
	}
	id, err := pathID(c)
	if err != nil {
		return err
	}
	result, err := h.query.Detail(c.UserContext(), id)
	if err != nil {
		return err
	}
	return response.Success(c, result)
}