package topdata

import (
	"os"
	"path/filepath"
	"testing"
)

const damagetypesRegistryTestTypes = `{
  "rows": [
    {"id": 0, "key": "damagetype:bludgeoning", "label": "Bludgeoning", "group_label": "Physical", "damage_type_group": 0},
    {"id": 1, "key": "damagetype:piercing", "label": "Piercing", "group_label": "Physical", "damage_type_group": 0}
  ]
}
`

// validate-topdata must never modify source lockfiles. Collection in read-only
// mode must leave the registry lock byte-identical even though the rows carry
// explicit ids that would otherwise mark the lock "modified".
func TestCollectGeneratedRegistryDatasetsReadOnlyDoesNotWriteLock(t *testing.T) {
	dataDir := t.TempDir()
	regDir := filepath.Join(dataDir, "damagetypes", "registry")
	mkdirAll(t, regDir)
	writeFile(t, filepath.Join(regDir, "types.json"), damagetypesRegistryTestTypes)

	lockPath := filepath.Join(regDir, "lock.json")
	original := "{\n    \"damagetype:bludgeoning\": 0,\n    \"damagetype:piercing\": 1\n}\n"
	writeFile(t, lockPath, original)

	if _, err := collectGeneratedRegistryDatasets(dataDir, false); err != nil {
		t.Fatalf("read-only collection failed: %v", err)
	}

	got, err := os.ReadFile(lockPath)
	if err != nil {
		t.Fatalf("read lockfile: %v", err)
	}
	if string(got) != original {
		t.Fatalf("read-only collection must not modify lockfile.\nwant: %q\ngot:  %q", original, string(got))
	}
}

// build-topdata still persists allocated ids to source lockfiles.
func TestCollectGeneratedRegistryDatasetsPersistWritesLock(t *testing.T) {
	dataDir := t.TempDir()
	regDir := filepath.Join(dataDir, "damagetypes", "registry")
	mkdirAll(t, regDir)
	writeFile(t, filepath.Join(regDir, "types.json"), damagetypesRegistryTestTypes)

	lockPath := filepath.Join(regDir, "lock.json")
	writeFile(t, lockPath, "{\n    \"damagetype:bludgeoning\": 0\n}\n")

	if _, err := collectGeneratedRegistryDatasets(dataDir, true); err != nil {
		t.Fatalf("persisting collection failed: %v", err)
	}

	lockData, err := loadLockfile(lockPath)
	if err != nil {
		t.Fatalf("load lockfile: %v", err)
	}
	if lockData["damagetype:piercing"] != 1 {
		t.Fatalf("persisting collection should record allocated id; got %#v", lockData)
	}
}