package httpapi

import (
	"net/http"
	"time"

	"cloudipvalidator/internal/db"
)

func (s *Server) handleAgentRegister(w http.ResponseWriter, r *http.Request) {
	var req registerAgentRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if req.ValidatorID == "" {
		writeError(w, http.StatusBadRequest, "validator_id is required")
		return
	}
	// os_port_id is supplied via control-api's own config (config.ValidatorConfig),
	// not by the agent, so registration only touches hostname/version here;
	// RegisterValidator preserves any existing os_port_id row.
	existing, _ := s.DB.GetValidator(r.Context(), req.ValidatorID)
	osPortID := ""
	if existing != nil {
		osPortID = existing.OSPortID
	}
	if err := s.DB.RegisterValidator(r.Context(), req.ValidatorID, req.Hostname, osPortID, req.AgentVersion); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	s.Orch.RecordEvent(r.Context(), "validator-agent", req.ValidatorID, nil, "registered", "")
	writeJSON(w, http.StatusOK, registerAgentResponse{OK: true, PollIntervalSeconds: s.Orch.Cfg.PollIntervalSeconds})
}

func (s *Server) handleAgentHeartbeat(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req heartbeatRequest
	_ = readJSON(r, &req) // heartbeat body is informational only; tolerate empty/missing
	if err := s.DB.Heartbeat(r.Context(), id); err != nil {
		writeError(w, http.StatusNotFound, "unknown validator: "+id)
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleAgentAssignment(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	item, checks, err := s.Orch.AssignmentForValidator(r.Context(), id)
	if err != nil {
		writeError(w, http.StatusNotFound, "unknown validator: "+id)
		return
	}
	if item == nil {
		w.WriteHeader(http.StatusNoContent)
		return
	}
	var cfg []checkConfigDTO
	for _, c := range checks {
		cfg = append(cfg, checkConfigDTO{Type: c.Type, Targets: c.Targets})
	}
	writeJSON(w, http.StatusOK, assignmentResponse{
		IPID: item.ID, IPAddress: item.IPAddress, Phase: item.State, CheckConfig: cfg,
	})
}

func (s *Server) handleAgentSelfCheck(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req selfCheckRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	detail := req.Detail
	if req.DetectedEgress != "" {
		detail = "detected_egress_ip=" + req.DetectedEgress + " " + detail
	}
	if err := s.Orch.SelfCheckResult(r.Context(), id, req.IPID, req.Success, detail); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleAgentEvent(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req agentEventRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if req.EventType == "" {
		writeError(w, http.StatusBadRequest, "event_type is required")
		return
	}
	s.Orch.RecordEvent(r.Context(), "validator-agent", id, req.IPID, req.EventType, req.Payload)
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleAgentResults(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var req agentResultsRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	for _, res := range req.Results {
		item, err := s.DB.GetIP(r.Context(), res.IPID)
		if err != nil {
			writeError(w, http.StatusNotFound, "unknown ip_id")
			return
		}
		checkedAt, err := time.Parse(time.RFC3339Nano, res.CheckedAt)
		if err != nil {
			checkedAt = db.Now()
		}
		err = s.Orch.RecordCheck(r.Context(), db.Check{
			IPID: item.ID, IPAddress: item.IPAddress, AttemptNumber: item.AttemptNumber,
			ValidatorID: id, Source: db.SourceEgress, CheckType: res.CheckType, Target: res.Target,
			Success: res.Success, LatencyMS: res.LatencyMS, Detail: res.Detail, CheckedAt: checkedAt,
		})
		if err != nil {
			writeError(w, http.StatusInternalServerError, err.Error())
			return
		}
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleAgentComplete(w http.ResponseWriter, r *http.Request) {
	var req agentCompleteRequest
	if err := readJSON(r, &req); err != nil {
		writeError(w, http.StatusBadRequest, "invalid body: "+err.Error())
		return
	}
	if err := s.Orch.MarkEgressComplete(r.Context(), req.IPID); err != nil {
		writeError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, okResponse{OK: true})
}

func (s *Server) handleWhatsMyIP(w http.ResponseWriter, r *http.Request) {
	writeJSON(w, http.StatusOK, map[string]string{"ip": remoteIP(r)})
}