package qaopsmirror

import (
	"context"
	"encoding/json"
	"knowledge-governance/internal/dobotaiops"
	pg "knowledge-governance/internal/platform/postgres"
	"testing"
)

func TestMasterReadsDeriveLanguageAndCoverageWithoutChangingSourceOrStoredFields(t *testing.T) {
	pool := mirrorFixture(t)
	ctx := context.Background()
	s := NewStore(pool, "fixture-local-fields")
	queue := pg.NewStore(pool)
	entry := fixtureEntry("local-language", "已有资料")
	var wire map[string]any
	_ = json.Unmarshal(entry.Payload, &wire)
	wire["question"] = "MG400 怎么连接 PLC？"
	entry.Payload, _ = json.Marshal(wire)
	job := claimMirrorJob(t, s, queue, "local-field-seed")
	if err := s.HandleSync(ctx, *job, func(context.Context) (Source, error) {
		return &fixtureSource{rows: []dobotaiops.MirrorRecord{entry}}, nil
	}); err != nil {
		t.Fatal(err)
	}
	got, err := s.GetMasterRecord(ctx, s.tenant, "local-language")
	if err != nil {
		t.Fatal(err)
	}
	if got.MasterFields["language"] != "中文" || got.MasterFields["question_chinese"] != got.Question || got.Coverage.Verdict != "covered" {
		t.Fatalf("master derivation not served: language=%q translation=%q coverage=%q", got.MasterFields["language"], got.MasterFields["question_chinese"], got.Coverage.Verdict)
	}
	var changed bool
	if err = pool.QueryRow(ctx, `SELECT payload?'master_fields' FROM qa_ops_master_records WHERE tenant_key=$1 AND id=$2`, s.tenant, got.ID).Scan(&changed); err != nil || changed {
		t.Fatal("read projection mutated stored master input", err)
	}
	source, err := s.GetRecord(ctx, s.tenant, got.ID)
	if err != nil || source.Coverage.Verdict != "" || source.MasterFields != nil {
		t.Fatal("master rule silently changed legacy/source projection", err)
	}
}