package handler

import (
	"bufio"
	"os"
	"strconv"

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

func Index(c *gin.Context) {

	p, _ := strconv.Atoi(c.Query("p"))
	if p < 1 {
		p = 1
	}
	limit := 5
	start := (p - 1) * limit

	list := make([]*Article, 0)
	sortListPath := "./data/index_sort_list"
	file, _ := os.Open(sortListPath)
	defer file.Close()

	scanner := bufio.NewScanner(file)

	scanner.Scan()
	total, _ := strconv.Atoi(scanner.Text())

	for i := 0; i < start+limit; i++ {
		scanner.Scan()
		if i >= start {
			id := scanner.Text()
			article, err := new(Article).GetArticleById(id)
			if err != nil {
				continue
			}
			list = append(list, article)
		}
	}

	nextPage := 0
	if start+limit < total {
		nextPage = p + 1
	}

	prevPage := 0
	if p >= 2 {
		prevPage = p - 1
	}

	title := os.Getenv("HOME_TITLE")

	c.HTML(200, "index.html", gin.H{
		"list":     list,
		"total":    total,
		"title":    title,
		"page":     p,
		"nextPage": nextPage,
		"prevPage": prevPage,
	})
}