package main

// The manager's settings (design 39 §8, design 39 bus-and-switch §33): today's five and the six of the switch, each
// declared in the manifest's `config` with its default and bound, set through mesh-config and written into the
// settings file. They are read again at every reading, so a change takes effect at the next one, and each change of a
// value read is written in the audit under `settings`.

import (
	"context"
	"fmt"
	"reflect"

	. "claude-licence-manager/internal/licences"
)

// settings are those in force.
func (m *Manager) settings() Settings {
	m.settingsMu.RLock()
	defer m.settingsMu.RUnlock()
	return m.Settings
}

// ReadSettings reads the settings file again, at every reading (§33): each value that changed is written in the audit
// under `settings`, its value before and now, and the settings read are those in force from then on.
func (m *Manager) ReadSettings(ctx context.Context) error {
	if m.SettingsFile == "" {
		return nil
	}
	next := SettingsFrom(m.SettingsFile)
	m.settingsMu.Lock()
	before := m.Settings
	m.Settings = next
	m.settingsMu.Unlock()
	was, now := before.Values(), next.Values()
	changed := map[string]any{}
	for k, v := range now {
		if !reflect.DeepEqual(was[k], v) {
			changed[k] = map[string]any{"from": was[k], "to": v}
		}
	}
	if len(changed) == 0 {
		return nil
	}
	return m.record(ctx, "settings", fmt.Sprintf("%d setting(s) changed: %v", len(changed), changed), changed)
}