package api

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"time"

	"proxmox-router/internal/tools"
)

func (s *Server) handleToolsPing(w http.ResponseWriter, r *http.Request) {
	var req tools.PingRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Invalid JSON: " + err.Error()})
		return
	}

	timeoutSec := req.Timeout
	if timeoutSec <= 0 {
		timeoutSec = 10
	}
	ctx, cancel := r.Context(), func() {}
	if timeoutSec > 0 {
		ctx, cancel = r.Context(), func() {}
		// Allow up to 35 seconds for ping
		_ = time.Duration(timeoutSec) * time.Second
	}
	defer cancel()

	resp, err := s.toolsMgr.RunPing(ctx, req)
	if err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}

	writeJSON(w, http.StatusOK, resp)
}

func (s *Server) handleToolsPingStream(w http.ResponseWriter, r *http.Request) {
	flusher, ok := w.(http.Flusher)
	if !ok {
		http.Error(w, "Streaming unsupported", http.StatusInternalServerError)
		return
	}

	var req tools.PingRequest
	if r.Method == http.MethodPost && r.Body != nil {
		_ = json.NewDecoder(r.Body).Decode(&req)
	}
	if req.Target == "" {
		q := r.URL.Query()
		req.Target = q.Get("target")
		req.Count, _ = strconv.Atoi(q.Get("count"))
		req.Size, _ = strconv.Atoi(q.Get("size"))
		req.Timeout, _ = strconv.Atoi(q.Get("timeout"))
		req.Interface = q.Get("interface")
		req.DoNotFrag = q.Get("dont_frag") == "true" || q.Get("dont_frag") == "1"
	}

	w.Header().Set("Content-Type", "text/event-stream")
	w.Header().Set("Cache-Control", "no-cache")
	w.Header().Set("Connection", "keep-alive")
	w.Header().Set("X-Accel-Buffering", "no")

	sendSSE := func(evt tools.PingStreamEvent) {
		b, err := json.Marshal(evt)
		if err == nil {
			fmt.Fprintf(w, "data: %s\n\n", b)
			flusher.Flush()
		}
	}

	err := s.toolsMgr.StreamPing(r.Context(), req, sendSSE)
	if err != nil {
		sendSSE(tools.PingStreamEvent{
			Type:    "error",
			Message: err.Error(),
			Raw:     "Error: " + err.Error(),
		})
	}
}

func (s *Server) handleToolsTraceroute(w http.ResponseWriter, r *http.Request) {
	var req tools.TracerouteRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Invalid JSON: " + err.Error()})
		return
	}

	resp, err := s.toolsMgr.RunTraceroute(r.Context(), req)
	if err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}

	writeJSON(w, http.StatusOK, resp)
}

func (s *Server) handleToolsTracerouteStream(w http.ResponseWriter, r *http.Request) {
	flusher, ok := w.(http.Flusher)
	if !ok {
		http.Error(w, "Streaming unsupported", http.StatusInternalServerError)
		return
	}

	var req tools.TracerouteRequest
	if r.Method == http.MethodPost && r.Body != nil {
		_ = json.NewDecoder(r.Body).Decode(&req)
	}
	if req.Target == "" {
		q := r.URL.Query()
		req.Target = q.Get("target")
		req.MaxHops, _ = strconv.Atoi(q.Get("max_hops"))
		req.Protocol = q.Get("protocol")
		req.Interface = q.Get("interface")
		req.Resolve = q.Get("resolve") == "true" || q.Get("resolve") == "1"
	}

	w.Header().Set("Content-Type", "text/event-stream")
	w.Header().Set("Cache-Control", "no-cache")
	w.Header().Set("Connection", "keep-alive")
	w.Header().Set("X-Accel-Buffering", "no")

	sendSSE := func(evt tools.TracerouteStreamEvent) {
		b, err := json.Marshal(evt)
		if err == nil {
			fmt.Fprintf(w, "data: %s\n\n", b)
			flusher.Flush()
		}
	}

	err := s.toolsMgr.StreamTraceroute(r.Context(), req, sendSSE)
	if err != nil {
		sendSSE(tools.TracerouteStreamEvent{
			Type:    "error",
			Message: err.Error(),
			Raw:     "Error: " + err.Error(),
		})
	}
}

func (s *Server) handleToolsDNS(w http.ResponseWriter, r *http.Request) {
	var req tools.DNSRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Invalid JSON: " + err.Error()})
		return
	}

	resp, err := s.toolsMgr.RunDNSLookup(r.Context(), req)
	if err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}

	writeJSON(w, http.StatusOK, resp)
}

func (s *Server) handleToolsPortProbe(w http.ResponseWriter, r *http.Request) {
	var req tools.PortProbeRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Invalid JSON: " + err.Error()})
		return
	}

	resp, err := s.toolsMgr.RunPortProbe(r.Context(), req)
	if err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}

	writeJSON(w, http.StatusOK, resp)
}

func (s *Server) handleToolsMTR(w http.ResponseWriter, r *http.Request) {
	var req tools.MTRRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Invalid JSON: " + err.Error()})
		return
	}

	resp, err := s.toolsMgr.RunMTR(r.Context(), req)
	if err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}

	writeJSON(w, http.StatusOK, resp)
}