package utils

import (
	"strconv"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// PaginationParams 分页参数
type PaginationParams struct {
	Page     int    `form:"page" json:"page"`           // 页码，从1开始
	PageSize int    `form:"page_size" json:"page_size"` // 每页数量
	Search   string `form:"search" json:"search"`       // 搜索关键词
}

// WelcomeQueryParams 欢迎语查询参数
type WelcomeQueryParams struct {
	PaginationParams
	IsActive    *bool  `form:"is_active" json:"is_active"`       // 启用状态筛选
	MessageType string `form:"message_type" json:"message_type"` // 消息类型筛选
}

// CommonQueryParams 通用查询参数（关键词/快捷回复/群发）
type CommonQueryParams struct {
	PaginationParams
	IsActive    *bool  `form:"is_active" json:"is_active"`       // 启用状态筛选
	MessageType string `form:"message_type" json:"message_type"` // 消息类型筛选
}

// PaginationResponse 分页响应
type PaginationResponse struct {
	List     interface{} `json:"list"`
	Total    int64       `json:"total"`
	Page     int         `json:"page"`
	PageSize int         `json:"page_size"`
	Pages    int         `json:"pages"`
}

// GetPaginationParams 从请求中获取分页参数
func GetPaginationParams(ctx *gin.Context) PaginationParams {
	params := PaginationParams{
		Page:     1,
		PageSize: 20,
		Search:   "",
	}

	if pageStr := ctx.Query("page"); pageStr != "" {
		if page, err := strconv.Atoi(pageStr); err == nil && page > 0 {
			params.Page = page
		}
	}

	if pageSizeStr := ctx.Query("page_size"); pageSizeStr != "" {
		if pageSize, err := strconv.Atoi(pageSizeStr); err == nil && pageSize > 0 && pageSize <= 100 {
			params.PageSize = pageSize
		}
	}

	params.Search = ctx.Query("search")

	return params
}

// GetWelcomeQueryParams 从请求中获取欢迎语查询参数
func GetWelcomeQueryParams(ctx *gin.Context) WelcomeQueryParams {
	params := WelcomeQueryParams{
		PaginationParams: GetPaginationParams(ctx),
		MessageType:      ctx.Query("message_type"),
	}

	if isActiveStr := ctx.Query("is_active"); isActiveStr != "" {
		if isActive, err := strconv.ParseBool(isActiveStr); err == nil {
			params.IsActive = &isActive
		}
	}

	return params
}

// GetCommonQueryParams 从请求中获取通用查询参数
func GetCommonQueryParams(ctx *gin.Context) CommonQueryParams {
	params := CommonQueryParams{
		PaginationParams: GetPaginationParams(ctx),
		MessageType:      ctx.Query("message_type"),
	}

	if isActiveStr := ctx.Query("is_active"); isActiveStr != "" {
		if isActive, err := strconv.ParseBool(isActiveStr); err == nil {
			params.IsActive = &isActive
		}
	}

	return params
}

// ApplyPagination 应用分页到查询
func ApplyPagination(db *gorm.DB, params PaginationParams) *gorm.DB {
	offset := (params.Page - 1) * params.PageSize
	return db.Offset(offset).Limit(params.PageSize)
}

// CreatePaginationResponse 创建分页响应
func CreatePaginationResponse(list interface{}, total int64, params PaginationParams) PaginationResponse {
	pages := int((total + int64(params.PageSize) - 1) / int64(params.PageSize))
	if pages == 0 {
		pages = 1
	}

	return PaginationResponse{
		List:     list,
		Total:    total,
		Page:     params.Page,
		PageSize: params.PageSize,
		Pages:    pages,
	}
}