package handlers

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

	"github.com/leolionad58/ticketbot/internal/db"
	panelauth "github.com/leolionad58/ticketbot/internal/panel/auth"
)

// ParseFunc is the signature of panel.ParseTemplates — injected to avoid import cycles.
type ParseFunc func(names ...string) (*template.Template, error)

// Renderer provides renderAuth and renderPage to handlers without importing the panel package.
type Renderer struct {
	parse        ParseFunc
	getBotStatus func() BotStatus
}

// NewRenderer creates a Renderer backed by the given parse function.
func NewRenderer(f ParseFunc) *Renderer { return &Renderer{parse: f} }

// SetBotStatus wires a live bot-status function so BotOnline is set on every page.
func (rnd *Renderer) SetBotStatus(fn func() BotStatus) { rnd.getBotStatus = fn }

// base builds baseData with BotOnline populated from the live bot status.
func (rnd *Renderer) base(r *http.Request, active string) baseData {
	b := newBase(r, active)
	if rnd.getBotStatus != nil {
		b.BotOnline = rnd.getBotStatus().Online
	}
	return b
}

func (rnd *Renderer) Auth(w http.ResponseWriter, page string, data any) {
	t, err := rnd.parse("auth_layout.html", page+".html")
	if err != nil {
		http.Error(w, "template error: "+err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := t.ExecuteTemplate(w, "auth_layout", data); err != nil {
		http.Error(w, "render error: "+err.Error(), http.StatusInternalServerError)
	}
}

func (rnd *Renderer) Page(w http.ResponseWriter, page string, data any) {
	t, err := rnd.parse("layout.html", page+".html")
	if err != nil {
		http.Error(w, "template error: "+err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := t.ExecuteTemplate(w, "layout", data); err != nil {
		http.Error(w, "render error: "+err.Error(), http.StatusInternalServerError)
	}
}

type baseData struct {
	CSRFToken  string
	Admin      *db.PanelAdmin
	ActivePage string
	BotOnline  bool
	Flash      string
	Error      string
}

func newBase(r *http.Request, active string) baseData {
	sess := panelauth.SessionFromContext(r.Context())
	admin := panelauth.AdminFromContext(r.Context())
	csrf := ""
	if sess != nil {
		csrf = sess.CSRFToken
	}
	return baseData{
		CSRFToken:  csrf,
		Admin:      admin,
		ActivePage: active,
		Flash:      r.URL.Query().Get("flash"),
	}
}

func clientIP(r *http.Request) string {
	if ip := r.Header.Get("X-Real-IP"); ip != "" {
		return ip
	}
	if ip := r.Header.Get("X-Forwarded-For"); ip != "" {
		return ip
	}
	return r.RemoteAddr
}