package httpapi

import (
	"encoding/json"
	"errors"
	"net/http"
	"strings"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/store"
)

func (s *Server) listRuntimePolicySets(w http.ResponseWriter, r *http.Request) {
	items, err := s.store.ListRuntimePolicySets(r.Context())
	if err != nil {
		s.logger.Error("list runtime policy sets failed", "error", err)
		writeError(w, http.StatusInternalServerError, "list runtime policy sets failed")
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"items": items})
}

func (s *Server) createRuntimePolicySet(w http.ResponseWriter, r *http.Request) {
	var input store.RuntimePolicySetInput
	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
		writeError(w, http.StatusBadRequest, "invalid json body")
		return
	}
	if !validRuntimePolicyInput(input) {
		writeError(w, http.StatusBadRequest, "policyKey and name are required")
		return
	}
	item, err := s.store.CreateRuntimePolicySet(r.Context(), input)
	if err != nil {
		if store.IsUniqueViolation(err) {
			writeError(w, http.StatusConflict, "runtime policy key already exists")
			return
		}
		s.logger.Error("create runtime policy set failed", "error", err)
		writeError(w, http.StatusInternalServerError, "create runtime policy set failed")
		return
	}
	writeJSON(w, http.StatusCreated, item)
}

func (s *Server) updateRuntimePolicySet(w http.ResponseWriter, r *http.Request) {
	var input store.RuntimePolicySetInput
	if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
		writeError(w, http.StatusBadRequest, "invalid json body")
		return
	}
	if !validRuntimePolicyInput(input) {
		writeError(w, http.StatusBadRequest, "policyKey and name are required")
		return
	}
	item, err := s.store.UpdateRuntimePolicySet(r.Context(), r.PathValue("policySetID"), input)
	if err != nil {
		if store.IsNotFound(err) {
			writeError(w, http.StatusNotFound, "runtime policy set not found")
			return
		}
		if store.IsUniqueViolation(err) {
			writeError(w, http.StatusConflict, "runtime policy key already exists")
			return
		}
		s.logger.Error("update runtime policy set failed", "error", err)
		writeError(w, http.StatusInternalServerError, "update runtime policy set failed")
		return
	}
	writeJSON(w, http.StatusOK, item)
}

func (s *Server) deleteRuntimePolicySet(w http.ResponseWriter, r *http.Request) {
	if err := s.store.DeleteRuntimePolicySet(r.Context(), r.PathValue("policySetID")); err != nil {
		if store.IsNotFound(err) {
			writeError(w, http.StatusNotFound, "runtime policy set not found")
			return
		}
		if errors.Is(err, store.ErrProtectedDefault) {
			writeError(w, http.StatusForbidden, "default runtime policy set cannot be deleted")
			return
		}
		s.logger.Error("delete runtime policy set failed", "error", err)
		writeError(w, http.StatusInternalServerError, "delete runtime policy set failed")
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

func validRuntimePolicyInput(input store.RuntimePolicySetInput) bool {
	return strings.TrimSpace(input.PolicyKey) != "" && strings.TrimSpace(input.Name) != ""
}