package hostbox

import (
	"context"
	"encoding/json"
)

// HostLaunches is root's local journal view, including older installations
// whose claim-named cgroups still need an emptiness check.
func (j *LaunchJournal) HostLaunches(ctx context.Context, host string) ([]LaunchInventory, error) {
	if j == nil || j.db == nil || j.remote != nil || !component(host) {
		return nil, ErrUnsupported
	}
	rows, err := journalExecutorFor(ctx, j.db).QueryContext(ctx, "SELECT identity, body FROM launches ORDER BY identity")
	if err != nil {
		return nil, err
	}
	defer rows.Close()
	var out []LaunchInventory
	for rows.Next() {
		var key string
		var body []byte
		if err := rows.Scan(&key, &body); err != nil {
			return nil, err
		}
		var in LaunchInventory
		if err := json.Unmarshal(body, &in); err != nil {
			return nil, err
		}
		if !validLaunchOwner(in.Target) || launchKey(in.Target) != key || !in.Completed.Valid() {
			return nil, ErrTypedInventory
		}
		if in.Target.Host == host {
			out = append(out, in)
		}
	}
	return out, rows.Err()
}