package app

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

func handleTransportSingBoxProfileCardPatch(w http.ResponseWriter, r *http.Request, id string) {
	var body SingBoxProfilePatchRequest
	if r.Body != nil {
		defer r.Body.Close()
		if err := json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body); err != nil && err != io.EOF {
			http.Error(w, "bad json", http.StatusBadRequest)
			return
		}
	}

	singBoxProfilesMu.Lock()
	defer singBoxProfilesMu.Unlock()

	st := loadSingBoxProfilesState()
	idx := findSingBoxProfileIndex(st.Items, id)
	if idx < 0 {
		writeJSON(w, http.StatusNotFound, SingBoxProfilesResponse{
			OK:      false,
			Code:    singBoxProfileCodeNotFound,
			Message: "not found",
		})
		return
	}
	cur := st.Items[idx]
	if body.BaseRevision > 0 && body.BaseRevision != cur.ProfileRevision {
		writeJSON(w, http.StatusConflict, SingBoxProfilesResponse{
			OK:      false,
			Code:    singBoxProfileCodeRevisionMismatch,
			Message: "base_revision mismatch",
			Item:    &cur,
		})
		return
	}

	next, secretRes, changed, code, err := patchSingBoxProfile(cur, body)
	if err != nil {
		status := http.StatusBadRequest
		if code == singBoxProfileCodeSecretsFailed {
			status = http.StatusInternalServerError
		}
		writeJSON(w, status, SingBoxProfilesResponse{
			OK:      false,
			Code:    code,
			Message: err.Error(),
			Item:    &cur,
		})
		return
	}
	if !changed {
		writeJSON(w, http.StatusOK, SingBoxProfilesResponse{
			OK:              true,
			Message:         "noop",
			ActiveProfileID: st.ActiveProfileID,
			Item:            &cur,
		})
		return
	}

	st.Items[idx] = next
	ensureSingBoxProfilesActiveID(&st)
	st.Revision++
	if err := saveSingBoxProfilesState(st); err != nil {
		if secretRes.Rollback != nil {
			secretRes.Rollback()
		}
		writeJSON(w, http.StatusInternalServerError, SingBoxProfilesResponse{
			OK:      false,
			Code:    singBoxProfileCodeSaveFailed,
			Message: "save failed: " + err.Error(),
			Item:    &cur,
		})
		return
	}
	events.push("singbox_profile_saved", map[string]any{
		"id":       next.ID,
		"revision": next.ProfileRevision,
	})
	writeJSON(w, http.StatusOK, SingBoxProfilesResponse{
		OK:              true,
		Message:         "updated",
		ActiveProfileID: st.ActiveProfileID,
		Item:            &next,
	})
}