package gemlog

import (
	_ "embed"
	"fmt"
	"log/slog"
	"os"
	"strconv"
	"strings"

	gemlog "git.travisshears.com/travisshears/gemlog-cli/gemlog"
	gemini "github.com/kulak/gemini"
)

type Gemlog struct {
	config *gemlog.Config
}

func NewGemlog() *Gemlog {
	port, err := strconv.Atoi(os.Getenv("COUCH_DB_PORT"))
	if err != nil {
		slog.Error("Failed to parse COUCH_DB_PORT", "error", err)
		os.Exit(1)
	}

	config := gemlog.Config{
		CouchDB: gemlog.CouchDBConfig{
			Host:     os.Getenv("COUCHDB_HOST"),
			Port:     port,
			User:     os.Getenv("COUCHDB_USER"),
			Password: os.Getenv("COUCHDB_PASSWORD"),
		},
	}

	g := &Gemlog{
		config: &config,
	}
	return g
}

func (g *Gemlog) HandleRequest(w gemini.ResponseWriter, req *gemini.Request) {
	path := req.URL.Path

	switch {
	case path == "/gemlog" || path == "/gemlog/":
		g.serveIndex(w, req)
	case strings.HasPrefix(path, "/gemlog/post/"):
		slug := strings.TrimPrefix(path, "/gemlog/post/")
		g.servePost(w, req, slug)
	default:
		w.WriteStatusMsg(gemini.StatusNotFound, "Page not found")
	}
}

//go:embed gemlog.gmi
var pageContnet string

func (g *Gemlog) serveIndex(w gemini.ResponseWriter, req *gemini.Request) {
	w.WriteStatusMsg(gemini.StatusSuccess, "text/gemini")

	var content strings.Builder
	content.Write([]byte(pageContnet))
	content.WriteString("\n")

	posts, err := gemlog.ListGemLogs(g.config)
	if err != nil {
		content.WriteString("Error fetching posts: " + err.Error() + "\n\n")
	}

	if len(posts) == 0 {
		content.WriteString("No posts found.\n\n")
	} else {
		content.WriteString("## Posts\n\n")

		for i, post := range posts {
			i = len(posts) - i
			hexNum := fmt.Sprintf("0x%04x", i)
			content.WriteString(fmt.Sprintf("=> /gemlog/post/%s %s - %s\n", post.Slug, hexNum, post.Title))
		}
	}

	content.WriteString("## Nav\n\n")
	// content.WriteString(fmt.Sprintf("=> /microblog/page/%d Next page\n", pageNum+1))
	content.WriteString("=> / Back to home\n")
	w.WriteBody([]byte(content.String()))
}

func (g *Gemlog) servePost(w gemini.ResponseWriter, req *gemini.Request, slug string) {
	var content strings.Builder
	w.WriteStatusMsg(gemini.StatusSuccess, "text/gemini")
	post, err := gemlog.ReadGemlogEntryBySlug(g.config, slug)
	if err != nil {
		content.WriteString("Error fetching gemlog post: " + err.Error() + "\n\n")
	}

	content.WriteString(fmt.Sprintf("# %s\n", post.Title))
	content.WriteString(fmt.Sprintf("posted: %s\n", post.Date.Format("2006-01-02")))
	content.WriteString(post.Gemtxt)
	content.WriteString("## Nav\n\n")
	content.WriteString("=> /gemlog Back to gemlog list\n")
	content.WriteString("=> / Back to home\n")
	w.WriteBody([]byte(content.String()))
}