package server

import (
	"net/http"
	"strings"

	"iblog/internal/db"

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

type FrontpageHandler struct {
	DB *db.DB
}

type frontpageData struct {
	Posts           []db.PostRecord
	Query           string
	ActiveTag       string
	SiteTitle       string
	SiteDescription string
}

func NewFrontpageHandler(database *db.DB) *FrontpageHandler {
	return &FrontpageHandler{DB: database}
}

func (h *FrontpageHandler) Serve(c *gin.Context) {
	query := strings.TrimSpace(c.Query("q"))
	tag := strings.TrimSpace(c.Query("tag"))

	title, _ := h.DB.GetSetting("site_title")
	desc, _ := h.DB.GetSetting("site_description")

	data := frontpageData{
		Query:           query,
		ActiveTag:       tag,
		SiteTitle:       title,
		SiteDescription: desc,
	}

	if query != "" {
		results, err := h.DB.Search(query)
		if err == nil {
			data.Posts = searchResultsToPosts(results, h.DB)
		}
	} else {
		posts, err := h.DB.ListPosts(false) // exclude drafts
		if err == nil {
			if tag != "" {
				posts = filterByTag(posts, tag)
			}
			data.Posts = posts
		}
	}

	c.HTML(http.StatusOK, "index.html", data)
}

func filterByTag(posts []db.PostRecord, tag string) []db.PostRecord {
	var filtered []db.PostRecord
	for _, p := range posts {
		for _, t := range p.Tags {
			if strings.EqualFold(t, tag) {
				filtered = append(filtered, p)
				break
			}
		}
	}
	return filtered
}

func searchResultsToPosts(results []db.SearchResult, database *db.DB) []db.PostRecord {
	var posts []db.PostRecord
	for _, r := range results {
		slug := strings.TrimPrefix(r.Path, "/")
		if slug == r.Path {
			continue // not a post
		}
		post, err := database.GetPostBySlug(slug)
		if err != nil || post.Draft {
			continue
		}
		posts = append(posts, *post)
	}
	return posts
}