package api

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

	"proxmox-router/internal/firewall"
	"proxmox-router/internal/routing"
)

// ======================== Firewall Summary ========================
func (s *Server) handleFirewallSummary(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, s.fwMgr.GetSummary())
}

func (s *Server) handleResetFirewallCounters(w http.ResponseWriter, r *http.Request) {
	if err := s.fwMgr.ResetCounters(); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true})
}

// ======================== Filter Rules ========================
func (s *Server) handleListFilterRules(w http.ResponseWriter, r *http.Request) {
	rules := s.fwMgr.ListFilterRules()
	writeJSON(w, http.StatusOK, rules)
}

func (s *Server) handleSaveFilterRule(w http.ResponseWriter, r *http.Request) {
	var rule firewall.FilterRule
	if err := json.NewDecoder(r.Body).Decode(&rule); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if rule.ID == "" {
		rule.ID = fmt.Sprintf("filter-%d", time.Now().UnixNano())
	}
	if err := s.fwMgr.SaveFilterRule(rule); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": rule.ID})
}

func (s *Server) handleDeleteFilterRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.fwMgr.DeleteFilterRule(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleMoveFilterRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Direction string `json:"direction"` // "up" or "down"
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.MoveFilterRule(id, req.Direction); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleSetFilterRuleState(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Disabled bool `json:"disabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.SetFilterRuleState(id, req.Disabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id, "disabled": req.Disabled})
}

// ======================== NAT Rules ========================
func (s *Server) handleListNATRules(w http.ResponseWriter, r *http.Request) {
	rules := s.fwMgr.ListNATRules()
	writeJSON(w, http.StatusOK, rules)
}

func (s *Server) handleSaveNATRule(w http.ResponseWriter, r *http.Request) {
	var rule firewall.NATRule
	if err := json.NewDecoder(r.Body).Decode(&rule); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if rule.ID == "" {
		rule.ID = fmt.Sprintf("nat-%d", time.Now().UnixNano())
	}
	if err := s.fwMgr.SaveNATRule(rule); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": rule.ID})
}

func (s *Server) handleDeleteNATRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.fwMgr.DeleteNATRule(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleMoveNATRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Direction string `json:"direction"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.MoveNATRule(id, req.Direction); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleSetNATRuleState(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Disabled bool `json:"disabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.SetNATRuleState(id, req.Disabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id, "disabled": req.Disabled})
}

// ======================== Mangle Rules ========================
func (s *Server) handleListMangleRules(w http.ResponseWriter, r *http.Request) {
	rules := s.fwMgr.ListMangleRules()
	writeJSON(w, http.StatusOK, rules)
}

func (s *Server) handleSaveMangleRule(w http.ResponseWriter, r *http.Request) {
	var rule firewall.MangleRule
	if err := json.NewDecoder(r.Body).Decode(&rule); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if rule.ID == "" {
		rule.ID = fmt.Sprintf("mangle-%d", time.Now().UnixNano())
	}
	if err := s.fwMgr.SaveMangleRule(rule); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": rule.ID})
}

func (s *Server) handleDeleteMangleRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.fwMgr.DeleteMangleRule(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleMoveMangleRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Direction string `json:"direction"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.MoveMangleRule(id, req.Direction); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleSetMangleRuleState(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Disabled bool `json:"disabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.SetMangleRuleState(id, req.Disabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id, "disabled": req.Disabled})
}

// ======================== Address Lists ========================
func (s *Server) handleListAddressLists(w http.ResponseWriter, r *http.Request) {
	lists := s.fwMgr.ListAddressLists()
	writeJSON(w, http.StatusOK, lists)
}

func (s *Server) handleSaveAddressListEntry(w http.ResponseWriter, r *http.Request) {
	var entry firewall.AddressListEntry
	if err := json.NewDecoder(r.Body).Decode(&entry); err != nil || entry.Name == "" || entry.Address == "" {
		writeError(w, http.StatusBadRequest, "name and address are required")
		return
	}
	if err := s.fwMgr.SaveAddressListEntry(entry); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": entry.ID})
}

func (s *Server) handleDeleteAddressListEntry(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.fwMgr.DeleteAddressListEntry(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleSetAddressListEntryState(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Disabled bool `json:"disabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.SetAddressListEntryState(id, req.Disabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id, "disabled": req.Disabled})
}

// ======================== Geo-Location ========================
func (s *Server) handleGeoIPStatus(w http.ResponseWriter, r *http.Request) {
	status := s.fwMgr.GeoIP().GetStatus()
	writeJSON(w, http.StatusOK, status)
}

func (s *Server) handleGeoIPConfig(w http.ResponseWriter, r *http.Request) {
	var req struct {
		AutoUpdate    bool `json:"auto_update"`
		IntervalHours int  `json:"interval_hours"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if err := s.fwMgr.GeoIP().SetConfig(req.AutoUpdate, req.IntervalHours); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "config": req})
}

func (s *Server) handleListGeoCountries(w http.ResponseWriter, r *http.Request) {
	countries := s.fwMgr.GeoIP().ListCountries()
	writeJSON(w, http.StatusOK, countries)
}

func (s *Server) handleToggleGeoCountry(w http.ResponseWriter, r *http.Request) {
	code := r.PathValue("code")
	var req struct {
		Enabled bool `json:"enabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.fwMgr.GeoIP().ToggleCountry(code, req.Enabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "code": code, "enabled": req.Enabled})
}

func (s *Server) handleUpdateGeoCountry(w http.ResponseWriter, r *http.Request) {
	code := r.PathValue("code")
	count, err := s.fwMgr.GeoIP().SyncCountryZone(code)
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "code": code, "subnets": count})
}

func (s *Server) handleGeoIPUpdateNow(w http.ResponseWriter, r *http.Request) {
	if err := s.fwMgr.GeoIP().UpdateNow(); err != nil {
		writeError(w, http.StatusConflict, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "message": "update started"})
}

func (s *Server) handleGeoIPBatchToggle(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Preset  string   `json:"preset"`
		Codes   []string `json:"codes"`
		Enabled bool     `json:"enabled"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if err := s.fwMgr.GeoIP().BatchToggle(req.Preset, req.Enabled, req.Codes); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "preset": req.Preset, "enabled": req.Enabled})
}

func (s *Server) handleGeoCountrySubnets(w http.ResponseWriter, r *http.Request) {
	code := r.PathValue("code")
	subnets := s.fwMgr.GeoIP().GetCountrySubnets(code, 100)
	writeJSON(w, http.StatusOK, map[string]any{"code": code, "subnets": subnets})
}

// ======================== Active Connections ========================
func (s *Server) handleListConnections(w http.ResponseWriter, r *http.Request) {
	conns, err := firewall.ListActiveConnections()
	if err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, conns)
}

func (s *Server) handleKillConnection(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Protocol string `json:"protocol"`
		Src      string `json:"src"`
		Sport    int    `json:"sport"`
		Dst      string `json:"dst"`
		Dport    int    `json:"dport"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if err := firewall.KillConnection(req.Protocol, req.Src, req.Sport, req.Dst, req.Dport); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true})
}

// ======================== Routes & Policy Routing ========================
func (s *Server) handleListRoutes(w http.ResponseWriter, r *http.Request) {
	routes := s.routingMgr.ListRoutes()
	writeJSON(w, http.StatusOK, routes)
}

func (s *Server) handleSaveRoute(w http.ResponseWriter, r *http.Request) {
	var route routing.RouteItem
	if err := json.NewDecoder(r.Body).Decode(&route); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if err := s.routingMgr.SaveRoute(route); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": route.ID})
}

func (s *Server) handleDeleteRoute(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.routingMgr.DeleteRoute(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleSetRouteState(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req struct {
		Disabled bool `json:"disabled"`
	}
	_ = json.NewDecoder(r.Body).Decode(&req)
	if err := s.routingMgr.SetRouteState(id, req.Disabled); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id, "disabled": req.Disabled})
}

func (s *Server) handleListPolicyRules(w http.ResponseWriter, r *http.Request) {
	rules := s.routingMgr.ListPolicyRules()
	writeJSON(w, http.StatusOK, rules)
}

func (s *Server) handleSavePolicyRule(w http.ResponseWriter, r *http.Request) {
	var rule routing.PolicyRuleItem
	if err := json.NewDecoder(r.Body).Decode(&rule); err != nil {
		writeError(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if err := s.routingMgr.SavePolicyRule(rule); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": rule.ID})
}

func (s *Server) handleDeletePolicyRule(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.routingMgr.DeletePolicyRule(id); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "id": id})
}

func (s *Server) handleListRoutingTables(w http.ResponseWriter, r *http.Request) {
	tables := s.routingMgr.ListTables()
	writeJSON(w, http.StatusOK, tables)
}

func (s *Server) handleSaveRoutingTable(w http.ResponseWriter, r *http.Request) {
	var table routing.RoutingTableItem
	if err := json.NewDecoder(r.Body).Decode(&table); err != nil || table.Name == "" {
		writeError(w, http.StatusBadRequest, "table name is required")
		return
	}
	if err := s.routingMgr.SaveTable(table); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"success": true, "name": table.Name})
}