package server

import (
	"html/template"
	"net/http"
	"strings"

	"github.com/gin-gonic/gin"
	"nebbet.no/internal/db"
)

type FrontpageHandler struct {
	DB        *db.MetaDB
	SearchDB  *db.SearchDB
	Templates *template.Template
}

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

func NewFrontpageHandler(metaDB *db.MetaDB, searchDB *db.SearchDB, tmpl *template.Template) *FrontpageHandler {
	return &FrontpageHandler{DB: metaDB, SearchDB: searchDB, Templates: tmpl}
}

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

	data := frontpageData{
		Query:     query,
		ActiveTag: tag,
	}

	if query != "" {
		// Full-text search
		results, err := h.SearchDB.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.Header("Content-Type", "text/html; charset=utf-8")
	if err := h.Templates.ExecuteTemplate(c.Writer, "index.html", data); err != nil {
		c.AbortWithStatus(http.StatusInternalServerError)
	}
}

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, metaDB *db.MetaDB) []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 := metaDB.GetPost(slug)
		if err != nil || post.Draft {
			continue
		}
		posts = append(posts, *post)
	}
	return posts
}