package actions

import (
	"fmt"
	"github.com/gin-contrib/sessions"
	"github.com/gin-gonic/gin"
	"github/fthvgb1/wp-go/helper"
	"github/fthvgb1/wp-go/internal/cache"
	dao "github/fthvgb1/wp-go/internal/dao"
	"github/fthvgb1/wp-go/internal/models"
	"github/fthvgb1/wp-go/internal/plugins"
	"github/fthvgb1/wp-go/internal/wpconfig"
	"github/fthvgb1/wp-go/model"
	"math"
	"net/http"
	"regexp"
	"strconv"
	"strings"
	"sync/atomic"
)

type indexHandle struct {
	c              *gin.Context
	session        sessions.Session
	page           int
	pageSize       int
	title          string
	titleL         string
	titleR         string
	search         string
	author         string
	totalPage      int
	category       string
	categoryType   string
	where          model.SqlBuilder
	orderBy        string
	order          string
	join           model.SqlBuilder
	postType       []any
	status         []any
	header         string
	paginationStep int
	scene          uint
}

func newIndexHandle(ctx *gin.Context) *indexHandle {
	size := wpconfig.Options.Value("posts_per_page")
	si, _ := strconv.Atoi(size)
	return &indexHandle{
		c:              ctx,
		session:        sessions.Default(ctx),
		page:           1,
		pageSize:       si,
		paginationStep: 1,
		titleL:         wpconfig.Options.Value("blogname"),
		titleR:         wpconfig.Options.Value("blogdescription"),
		where: model.SqlBuilder{
			{"post_type", "in", ""},
			{"post_status", "in", ""},
		},
		orderBy:  "post_date",
		join:     model.SqlBuilder{},
		postType: []any{"post"},
		status:   []any{"publish"},
		scene:    plugins.Home,
	}
}
func (h *indexHandle) setTitleLR(l, r string) {
	h.titleL = l
	h.titleR = r
}

func (h *indexHandle) getTitle() string {
	h.title = fmt.Sprintf("%s-%s", h.titleL, h.titleR)
	return h.title
}

func (h *indexHandle) getSearchKey() string {
	return fmt.Sprintf("action:%s|%s|%s|%s|%s|%s|%d|%d", h.author, h.search, h.orderBy, h.order, h.category, h.categoryType, h.page, h.pageSize)
}

func (h *indexHandle) parseParams() (err error) {
	h.order = h.c.Query("order")
	if !helper.IsContainInArr(h.order, []string{"asc", "desc"}) {
		h.order = "asc"
	}
	year := h.c.Param("year")
	if year != "" {
		h.where = append(h.where, []string{
			"year(post_date)", year,
		})
	}
	month := h.c.Param("month")
	if month != "" {
		h.where = append(h.where, []string{
			"month(post_date)", month,
		})
		ss := fmt.Sprintf("%s年%s月", year, strings.TrimLeft(month, "0"))
		h.header = fmt.Sprintf("月度归档： <span>%s</span>", ss)
		h.setTitleLR(ss, wpconfig.Options.Value("blogname"))
		h.scene = plugins.Archive
	}
	category := h.c.Param("category")
	if category == "" {
		category = h.c.Param("tag")
		if category != "" {
			h.categoryType = "post_tag"
			h.header = fmt.Sprintf("标签： <span>%s</span>", category)
		}
	} else {
		h.categoryType = "category"
		h.header = fmt.Sprintf("分类： <span>%s</span>", category)
	}
	h.category = category
	username := h.c.Param("author")
	if username != "" {
		user, er := cache.GetUserByName(h.c, username)
		if er != nil {
			err = er
			return
		}
		h.author = username
		h.where = append(h.where, []string{
			"post_author", "=", strconv.FormatUint(user.Id, 10), "int",
		})
	}
	if category != "" {
		h.where = append(h.where, []string{
			"d.name", category,
		}, []string{"taxonomy", h.categoryType})
		h.join = append(h.join, []string{
			"a", "left join", "wp_term_relationships b", "a.Id=b.object_id",
		}, []string{
			"left join", "wp_term_taxonomy c", "b.term_taxonomy_id=c.term_taxonomy_id",
		}, []string{
			"left join", "wp_terms d", "c.term_id=d.term_id",
		})
		h.setTitleLR(category, wpconfig.Options.Value("blogname"))
		h.scene = plugins.Category
	}
	s := h.c.Query("s")
	if s != "" && strings.Replace(s, " ", "", -1) != "" {
		q := helper.StrJoin("%", s, "%")
		h.where = append(h.where, []string{
			"and", "post_title", "like", q, "",
			"or", "post_content", "like", q, "",
			"or", "post_excerpt", "like", q, "",
		}, []string{"post_password", ""})
		h.postType = append(h.postType, "page", "attachment")
		h.header = fmt.Sprintf("%s的搜索结果", s)
		h.setTitleLR(helper.StrJoin(`"`, s, `"`, "的搜索结果"), wpconfig.Options.Value("blogname"))
		h.search = s
		h.scene = plugins.Search
	}
	p := h.c.Query("paged")
	if p == "" {
		p = h.c.Param("page")
	}
	if p != "" {
		if pa, err := strconv.Atoi(p); err == nil {
			h.page = pa
		}
	}
	total := int(atomic.LoadInt64(&dao.TotalRaw))
	if total > 0 && total < (h.page-1)*h.pageSize {
		h.page = 1
	}
	if h.page > 1 && (h.category != "" || h.search != "" || month != "") {
		h.setTitleLR(fmt.Sprintf("%s-第%d页", h.titleL, h.page), wpconfig.Options.Value("blogname"))
	}
	return
}

func (h *indexHandle) getTotalPage(totalRaws int) int {
	h.totalPage = int(math.Ceil(float64(totalRaws) / float64(h.pageSize)))
	return h.totalPage
}

func Index(c *gin.Context) {
	h := newIndexHandle(c)
	var postIds []models.Posts
	var totalRaw int
	var err error
	archive := cache.Archives(c)
	recent := cache.RecentPosts(c, 5)
	categoryItems := cache.Categories(c)
	recentComments := cache.RecentComments(c, 5)
	ginH := gin.H{
		"options":        wpconfig.Options,
		"recentPosts":    recent,
		"archives":       archive,
		"categories":     categoryItems,
		"search":         h.search,
		"header":         h.header,
		"recentComments": recentComments,
	}
	defer func() {
		stat := http.StatusOK
		if err != nil {
			c.Error(err)
			stat = http.StatusInternalServerError
			return
		}
		c.HTML(stat, helper.StrJoin(wpconfig.Options.Value("template"), "/posts/index.gohtml"), ginH)
	}()
	err = h.parseParams()
	if err != nil {
		return
	}
	ginH["title"] = h.getTitle()
	if c.Param("month") != "" {
		postIds, totalRaw, err = cache.GetMonthPostIds(c, c.Param("year"), c.Param("month"), h.page, h.pageSize, h.order)
		if err != nil {
			return
		}
	} else if h.search != "" {
		postIds, totalRaw, err = cache.SearchPost(c, h.getSearchKey(), c, h.where, h.page, h.pageSize, model.SqlBuilder{{h.orderBy, h.order}}, h.join, h.postType, h.status)
	} else {
		postIds, totalRaw, err = cache.PostLists(c, h.getSearchKey(), c, h.where, h.page, h.pageSize, model.SqlBuilder{{h.orderBy, h.order}}, h.join, h.postType, h.status)
	}
	if err != nil {
		return
	}
	if len(postIds) < 1 && h.category != "" {
		h.titleL = "未找到页面"
	}

	pw := h.session.Get("post_password")
	plug := plugins.NewPostPlugin(c, h.scene)
	for i, post := range postIds {
		plugins.PasswordProjectTitle(&postIds[i])
		if post.PostPassword != "" && pw != post.PostPassword {
			plugins.PasswdProjectContent(&postIds[i])
		} else {
			plugins.ApplyPlugin(plug, &postIds[i])
		}
	}
	for i, post := range recent {
		if post.PostPassword != "" && pw != post.PostPassword {
			plugins.PasswdProjectContent(&recent[i])
		}
	}
	q := c.Request.URL.Query().Encode()
	if q != "" {
		q = fmt.Sprintf("?%s", q)
	}
	ginH["posts"] = postIds
	ginH["totalPage"] = h.getTotalPage(totalRaw)
	ginH["pagination"] = pagination(h.page, h.totalPage, h.paginationStep, c.Request.URL.Path, q)
	ginH["title"] = h.getTitle()
}

var complie = regexp.MustCompile(`(/page)/(\d+)`)

func pagination(currentPage, totalPage, step int, path, query string) (html string) {
	if totalPage < 2 {
		return
	}
	pathx := path
	if !strings.Contains(path, "/page/") {
		pathx = fmt.Sprintf("%s%s", path, "/page/1")
	}
	s := strings.Builder{}
	if currentPage > totalPage {
		currentPage = totalPage
	}
	r := complie
	start := currentPage - step
	end := currentPage + step
	if start < 1 {
		start = 1
	}
	if currentPage > 1 {
		pp := ""
		if currentPage >= 2 {
			pp = replacePage(r, pathx, currentPage-1)
		}
		s.WriteString(fmt.Sprintf(`<a class="prev page-numbers" href="%s%s">上一页</a>`, pp, query))
	}
	if currentPage >= step+2 {
		d := ""
		if currentPage > step+2 {
			d = `<span class="page-numbers dots">…</span>`
		}
		e := replacePage(r, path, 1)
		s.WriteString(fmt.Sprintf(`
<a class="page-numbers" href="%s%s"><span class="meta-nav screen-reader-text">页 </span>1</a>
%s
`, e, query, d))
	}
	if totalPage < end {
		end = totalPage
	}

	for page := start; page <= end; page++ {
		h := ""
		if currentPage == page {
			h = fmt.Sprintf(`
<span aria-current="page" class="page-numbers current">
            <span class="meta-nav screen-reader-text">页 </span>%d</span>
`, page)

		} else {
			d := replacePage(r, pathx, page)
			h = fmt.Sprintf(`
<a class="page-numbers" href="%s%s">
<span class="meta-nav screen-reader-text">页 </span>%d</a>
`, d, query, page)
		}
		s.WriteString(h)

	}
	if totalPage >= currentPage+step+1 {
		if totalPage > currentPage+step+1 {
			s.WriteString(`<span class="page-numbers dots">…</span>`)
		}
		dd := replacePage(r, pathx, totalPage)
		s.WriteString(fmt.Sprintf(`
<a class="page-numbers" href="%s%s"><span class="meta-nav screen-reader-text">页 </span>%d</a>`, dd, query, totalPage))
	}
	if currentPage < totalPage {
		dd := replacePage(r, pathx, currentPage+1)
		s.WriteString(fmt.Sprintf(`<a class="next page-numbers" href="%s%s">下一页</a>`, dd, query))
	}
	html = s.String()
	return
}

func replacePage(r *regexp.Regexp, path string, page int) (src string) {
	if page == 1 {
		src = r.ReplaceAllString(path, "")
	} else {
		s := fmt.Sprintf("$1/%d", page)
		src = r.ReplaceAllString(path, s)
	}
	src = strings.Replace(src, "//", "/", -1)
	if src == "" {
		src = "/"
	}
	return
}