package main

// A node whose packages are over the bus's cap is unhealthy, naming the size (novox/hq ADR 0507 §2, acceptance
// 1840/AC3): `installed.<node>` keeps its last value, which is no longer the node's, and the module's health says
// so until the keeper writes it again and deletes the mark.

import (
	"encoding/json"
	"fmt"
)

// InstalledHealth is the health of this node's `installed` key: unhealthy while `<node>.not-current` is there,
// with its size and since when; ok false when there is nothing to say (the key is current, or the state cannot
// be read here, which the keeper's own log says).
func (m *Machine) InstalledHealth() (Health, bool) {
	if m.States == nil || m.Node == "" {
		return Health{}, false
	}
	e, err := m.States(StateInstalled).Get(NotCurrentKey(m.Node))
	if err != nil {
		return Health{Why: "the node's packages on the bus could not be read: " + err.Error()}, true
	}
	if e == nil {
		return Health{}, false
	}
	var nc NotCurrent
	if err := json.Unmarshal(e.Value, &nc); err != nil {
		return Health{Why: fmt.Sprintf("installed.%s is marked not current, and its mark is not readable: %v", m.Node, err)}, true
	}
	return Health{Why: fmt.Sprintf("the node's packages come to %d bytes, over the bus's cap of %d on a value, since %s: "+
		"installed.%s keeps an older list", nc.Bytes, ValueCap, nc.Since.Format("2006-01-02 15:04 MST"), m.Node)}, true
}