package web

import (
	"strconv"
	"strings"

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

const maxAccountPage = 10000

type accountPage struct {
	Current int
	Total   int
	Count   int64
	PrevURL string
	NextURL string
}

func accountPageNum(c *gin.Context) (int, bool) {
	if c.Request.URL.Query().Has("page") {
		return 0, false
	}
	raw := strings.TrimSpace(c.Param("page"))
	if raw == "" {
		return 1, true
	}
	page, err := strconv.Atoi(raw)
	if err != nil || page < 1 || page > maxAccountPage {
		return 0, false
	}
	return page, true
}

func makeAccountPage(path string, page, size int, count int64) accountPage {
	total := int((count + int64(size) - 1) / int64(size))
	p := accountPage{Current: page, Total: total, Count: count}
	link := func(n int) string {
		path = strings.TrimRight(path, "/")
		if n <= 1 {
			return path
		}
		return path + "/page/" + strconv.Itoa(n)
	}
	if page > 1 {
		p.PrevURL = link(page - 1)
	}
	if page < total {
		p.NextURL = link(page + 1)
	}
	return p
}