// Изменено: 2026-03-07
// triggers.go — CRUD handlers для Trigger CRD.
// Триггеры привязаны к Function через FunctionRef.
// Namespace берётся из URL: /v1/namespaces/{namespace}/triggers/{name}

package handler

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

	"k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"sigs.k8s.io/controller-runtime/pkg/client"

	slessv1alpha1 "gitea-naeel.giteak8s.services.ngcloud.ru/naeel/sless/api/v1alpha1"
)

// triggerRequest — тело запроса для создания триггера.
type triggerRequest struct {
	Name           string `json:"name"`
	Type           string `json:"type"`     // http | cron
	FunctionRef    string `json:"function"` // имя Function CRD
	Schedule       string `json:"schedule"` // cron-расписание, только для type=cron
	PreWarmSeconds int32  `json:"pre_warm_seconds"`
}

// triggerResponse — ответ при чтении триггера.
type triggerResponse struct {
	Name        string `json:"name"`
	Namespace   string `json:"namespace"`
	Type        string `json:"type"`
	FunctionRef string `json:"function"`
	Schedule    string `json:"schedule,omitempty"`
	Active      bool   `json:"active"`
	URL         string `json:"url,omitempty"`
	Message     string `json:"message,omitempty"`
}

// trToResponse конвертирует Trigger CRD в ответ API.
func trToResponse(tr *slessv1alpha1.Trigger) triggerResponse {
	return triggerResponse{
		Name:        tr.Name,
		Namespace:   tr.Namespace,
		Type:        string(tr.Spec.Type),
		FunctionRef: tr.Spec.FunctionRef,
		Schedule:    tr.Spec.Schedule,
		Active:      tr.Status.Active,
		URL:         tr.Status.URL,
		Message:     tr.Status.Message,
	}
}

// ListTriggers — GET /v1/namespaces/{namespace}/triggers
func (h *Handler) ListTriggers(w http.ResponseWriter, r *http.Request) {
	ns := namespace(r)
	list := &slessv1alpha1.TriggerList{}
	if err := h.K8s.List(r.Context(), list, client.InNamespace(ns)); err != nil {
		writeJSON(w, http.StatusInternalServerError, errResp(err.Error()))
		return
	}
	result := make([]triggerResponse, 0, len(list.Items))
	for i := range list.Items {
		result = append(result, trToResponse(&list.Items[i]))
	}
	writeJSON(w, http.StatusOK, result)
}

// CreateTrigger — POST /v1/namespaces/{namespace}/triggers
func (h *Handler) CreateTrigger(w http.ResponseWriter, r *http.Request) {
	ns := namespace(r)
	var req triggerRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		writeJSON(w, http.StatusBadRequest, errResp("invalid JSON: "+err.Error()))
		return
	}
	if req.Name == "" || req.Type == "" || req.FunctionRef == "" {
		writeJSON(w, http.StatusBadRequest, errResp("name, type and function are required"))
		return
	}
	if req.Type == "cron" && req.Schedule == "" {
		writeJSON(w, http.StatusBadRequest, errResp("schedule is required for cron trigger"))
		return
	}

	tr := &slessv1alpha1.Trigger{
		ObjectMeta: metav1.ObjectMeta{
			Name:      req.Name,
			Namespace: ns,
		},
		Spec: slessv1alpha1.TriggerSpec{
			Type:           slessv1alpha1.TriggerType(req.Type),
			FunctionRef:    req.FunctionRef,
			Schedule:       req.Schedule,
			PreWarmSeconds: req.PreWarmSeconds,
		},
	}
	if err := h.K8s.Create(r.Context(), tr); err != nil {
		if errors.IsAlreadyExists(err) {
			writeJSON(w, http.StatusConflict, errResp("trigger already exists"))
			return
		}
		writeJSON(w, http.StatusInternalServerError, errResp(err.Error()))
		return
	}
	writeJSON(w, http.StatusCreated, trToResponse(tr))
}

// GetTrigger — GET /v1/namespaces/{namespace}/triggers/{name}
func (h *Handler) GetTrigger(w http.ResponseWriter, r *http.Request) {
	ns := namespace(r)
	name := pathVar(r, "name")
	tr := &slessv1alpha1.Trigger{}
	if err := h.K8s.Get(r.Context(), client.ObjectKey{Name: name, Namespace: ns}, tr); err != nil {
		if errors.IsNotFound(err) {
			writeJSON(w, http.StatusNotFound, errResp("trigger not found"))
			return
		}
		writeJSON(w, http.StatusInternalServerError, errResp(err.Error()))
		return
	}
	writeJSON(w, http.StatusOK, trToResponse(tr))
}

// DeleteTrigger — DELETE /v1/namespaces/{namespace}/triggers/{name}
func (h *Handler) DeleteTrigger(w http.ResponseWriter, r *http.Request) {
	ns := namespace(r)
	name := pathVar(r, "name")
	tr := &slessv1alpha1.Trigger{}
	if err := h.K8s.Get(r.Context(), client.ObjectKey{Name: name, Namespace: ns}, tr); err != nil {
		if errors.IsNotFound(err) {
			w.WriteHeader(http.StatusNoContent)
			return
		}
		writeJSON(w, http.StatusInternalServerError, errResp(err.Error()))
		return
	}
	if err := h.K8s.Delete(r.Context(), tr); err != nil {
		writeJSON(w, http.StatusInternalServerError, errResp(err.Error()))
		return
	}
	w.WriteHeader(http.StatusNoContent)
}