package inventory

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"

	"github.com/jackc/pgx/v5"
)

// Described is what a machine said about itself beyond its capabilities: the architecture and kernel
// its node-engine runs on (novox/hq to-be 45 §9, the facts snapshot).
type Described struct {
	Architecture string `json:"architecture"`
	Kernel       string `json:"kernel"`
}

// DescribedOf is the architecture and kernel a machine last reported; empty for one that never has.
func (i *Inventory) DescribedOf(ctx context.Context, nodeName string) (Described, error) {
	var raw []byte
	err := i.store.Pool().QueryRow(ctx, `select profile from node where name = $1`, nodeName).Scan(&raw)
	if errors.Is(err, pgx.ErrNoRows) {
		return Described{}, fmt.Errorf("%w: %s", ErrNoSuchNode, nodeName)
	}
	if err != nil || len(raw) == 0 {
		return Described{}, err
	}
	var r Described
	if err := json.Unmarshal(raw, &r); err != nil {
		return Described{}, err
	}
	return r, nil
}

// ServerVersion is the store's own word for the release it runs — the version a test suite standing in
// for it must run (novox/hq ADR 0227 rule 9).
func (i *Inventory) ServerVersion(ctx context.Context) (string, error) {
	var v string
	err := i.store.Pool().QueryRow(ctx, `show server_version`).Scan(&v)
	return v, err
}