package web

import (
	"encoding/base64"
	"encoding/json"
	"net/http"

	"git.t-juice.club/torjus/oubliette/internal/storage"
)

type dashboardData struct {
	Stats          *storage.DashboardStats
	TopUsernames   []storage.TopEntry
	TopPasswords   []storage.TopEntry
	TopIPs         []storage.TopEntry
	ActiveSessions []storage.Session
	RecentSessions []storage.Session
}

func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	stats, err := s.store.GetDashboardStats(ctx)
	if err != nil {
		s.logger.Error("failed to get dashboard stats", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	topUsernames, err := s.store.GetTopUsernames(ctx, 10)
	if err != nil {
		s.logger.Error("failed to get top usernames", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	topPasswords, err := s.store.GetTopPasswords(ctx, 10)
	if err != nil {
		s.logger.Error("failed to get top passwords", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	topIPs, err := s.store.GetTopIPs(ctx, 10)
	if err != nil {
		s.logger.Error("failed to get top IPs", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	activeSessions, err := s.store.GetRecentSessions(ctx, 50, true)
	if err != nil {
		s.logger.Error("failed to get active sessions", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	recentSessions, err := s.store.GetRecentSessions(ctx, 50, false)
	if err != nil {
		s.logger.Error("failed to get recent sessions", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	data := dashboardData{
		Stats:          stats,
		TopUsernames:   topUsernames,
		TopPasswords:   topPasswords,
		TopIPs:         topIPs,
		ActiveSessions: activeSessions,
		RecentSessions: recentSessions,
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := s.tmpl.dashboard.ExecuteTemplate(w, "layout.html", data); err != nil {
		s.logger.Error("failed to render dashboard", "err", err)
	}
}

func (s *Server) handleFragmentStats(w http.ResponseWriter, r *http.Request) {
	stats, err := s.store.GetDashboardStats(r.Context())
	if err != nil {
		s.logger.Error("failed to get dashboard stats", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := s.tmpl.dashboard.ExecuteTemplate(w, "stats", stats); err != nil {
		s.logger.Error("failed to render stats fragment", "err", err)
	}
}

func (s *Server) handleFragmentActiveSessions(w http.ResponseWriter, r *http.Request) {
	sessions, err := s.store.GetRecentSessions(r.Context(), 50, true)
	if err != nil {
		s.logger.Error("failed to get active sessions", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := s.tmpl.dashboard.ExecuteTemplate(w, "active_sessions", sessions); err != nil {
		s.logger.Error("failed to render active sessions fragment", "err", err)
	}
}

type sessionDetailData struct {
	Session    *storage.Session
	Logs       []storage.SessionLog
	EventCount int
}

func (s *Server) handleSessionDetail(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	sessionID := r.PathValue("id")

	session, err := s.store.GetSession(ctx, sessionID)
	if err != nil {
		s.logger.Error("failed to get session", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}
	if session == nil {
		http.NotFound(w, r)
		return
	}

	logs, err := s.store.GetSessionLogs(ctx, sessionID)
	if err != nil {
		s.logger.Error("failed to get session logs", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	events, err := s.store.GetSessionEvents(ctx, sessionID)
	if err != nil {
		s.logger.Error("failed to get session events", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	data := sessionDetailData{
		Session:    session,
		Logs:       logs,
		EventCount: len(events),
	}

	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	if err := s.tmpl.sessionDetail.ExecuteTemplate(w, "layout.html", data); err != nil {
		s.logger.Error("failed to render session detail", "err", err)
	}
}

type apiEvent struct {
	T    int64  `json:"t"`
	D    int    `json:"d"`
	Data string `json:"data"`
}

type apiEventsResponse struct {
	Events []apiEvent `json:"events"`
}

func (s *Server) handleAPISessionEvents(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	sessionID := r.PathValue("id")

	events, err := s.store.GetSessionEvents(ctx, sessionID)
	if err != nil {
		s.logger.Error("failed to get session events", "err", err)
		http.Error(w, "Internal Server Error", http.StatusInternalServerError)
		return
	}

	resp := apiEventsResponse{Events: make([]apiEvent, len(events))}
	var baseTime int64
	for i, e := range events {
		ms := e.Timestamp.UnixMilli()
		if i == 0 {
			baseTime = ms
		}
		resp.Events[i] = apiEvent{
			T:    ms - baseTime,
			D:    e.Direction,
			Data: base64.StdEncoding.EncodeToString(e.Data),
		}
	}

	w.Header().Set("Content-Type", "application/json")
	if err := json.NewEncoder(w).Encode(resp); err != nil {
		s.logger.Error("failed to encode session events", "err", err)
	}
}