package inventory

import (
	"encoding/json"
	"testing"
	"time"
)

func TestEffectiveValuesPreserveFactsAndPreferOverrides(t *testing.T) {
	now := time.Date(2026, 8, 12, 1, 0, 0, 0, time.UTC)
	facts := []FactView{
		{FieldName: "image", SourceID: "primary", SourceName: "Unraid", Value: json.RawMessage(`"stable"`), ObservedAt: now, Confidence: 1},
		{FieldName: "image", SourceID: "secondary", SourceName: "Agent", Value: json.RawMessage(`"older"`), ObservedAt: now.Add(-time.Hour), Confidence: .8},
		{FieldName: "status", SourceID: "primary", SourceName: "Unraid", Value: json.RawMessage(`"running"`), ObservedAt: now, Confidence: 1},
	}
	overrides := []OverrideView{{FieldName: "image", Value: json.RawMessage(`"manual"`), UpdatedAt: now.Add(time.Minute)}}

	effective := effectiveValues(facts, overrides)
	if len(effective) != 2 || len(facts) != 3 {
		t.Fatalf("effective=%d facts=%d", len(effective), len(facts))
	}
	if effective[0].FieldName != "image" || effective[0].Origin != "override" || string(effective[0].Value) != `"manual"` {
		t.Fatalf("override did not win: %+v", effective[0])
	}
	if effective[1].FieldName != "status" || effective[1].Origin != "discovered" || effective[1].SourceName != "Unraid" {
		t.Fatalf("discovered provenance lost: %+v", effective[1])
	}
}