// direct_multi_test.go — daemon-beta task 1 多資料夾 config（單數相容／manifest 分根／多根掃描）。
package main

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func writeDirectConfig(t *testing.T, dir string, cfg map[string]any) string {
	t.Helper()
	data, _ := json.Marshal(cfg)
	p := filepath.Join(dir, "config.json")
	if err := os.WriteFile(p, data, 0o600); err != nil {
		t.Fatal(err)
	}
	return p
}

// 單數舊制照舊可載入；Folders() 正規化＝一根。
// t86b：單根也分實例，manifest 路徑含 instanceHost 尾碼，不再沿用 cfg.Manifest 原名。
func TestLoadDirectConfigSingularCompat(t *testing.T) {
	dir := t.TempDir()
	p := writeDirectConfig(t, dir, map[string]any{
		"watch_folder": "/tmp/kb", "manifest": filepath.Join(dir, "m.json"),
		"cypher_url": "https://x.example", "namespace": "demo",
	})
	c, err := LoadDirectConfig(p)
	if err != nil {
		t.Fatal(err)
	}
	if got := c.Folders(); len(got) != 1 || got[0] != "/tmp/kb" {
		t.Fatalf("Folders()=%v", got)
	}
	// t86b：單根也含實例尾碼，不再沿用裸 cfg.Manifest
	mp := c.manifestPathFor("/tmp/kb")
	if mp == c.Manifest {
		t.Fatalf("t86b：單根 manifest 應含實例尾碼，不應沿用 cfg.Manifest 原路徑，got %s", mp)
	}
	// 穩定性：同路徑同 config 重算一致
	if mp != c.manifestPathFor("/tmp/kb") {
		t.Fatal("manifestPathFor 應穩定")
	}
}

// 只填 watch_folders 也合法；單數與清單並存時去重保序。
func TestLoadDirectConfigMulti(t *testing.T) {
	dir := t.TempDir()
	p := writeDirectConfig(t, dir, map[string]any{
		"watch_folder": "/tmp/a", "watch_folders": []string{"/tmp/b", "/tmp/a", "/tmp/c"},
		"manifest":   filepath.Join(dir, "m.json"),
		"cypher_url": "https://x.example", "namespace": "demo",
	})
	c, err := LoadDirectConfig(p)
	if err != nil {
		t.Fatal(err)
	}
	got := c.Folders()
	want := []string{"/tmp/a", "/tmp/b", "/tmp/c"}
	if len(got) != len(want) {
		t.Fatalf("Folders()=%v want %v", got, want)
	}
	for i := range want {
		if got[i] != want[i] {
			t.Fatalf("Folders()[%d]=%s want %s", i, got[i], want[i])
		}
	}
	// 多根＝每根 manifest 各一份、彼此不同、且尾碼對同一路徑穩定
	m1 := c.manifestPathFor("/tmp/a")
	m2 := c.manifestPathFor("/tmp/b")
	if m1 == m2 || m1 == c.Manifest {
		t.Fatalf("多根 manifest 應分根：%s vs %s", m1, m2)
	}
	if m1 != c.manifestPathFor("/tmp/a") {
		t.Fatal("同路徑尾碼應穩定")
	}
}

// 兩欄都空＝缺必填。
func TestLoadDirectConfigMissingFolders(t *testing.T) {
	dir := t.TempDir()
	p := writeDirectConfig(t, dir, map[string]any{
		"manifest": filepath.Join(dir, "m.json"), "cypher_url": "https://x.example", "namespace": "demo",
	})
	if _, err := LoadDirectConfig(p); err == nil {
		t.Fatal("兩欄皆空應報缺必填")
	}
}

// 多根 dry-run：各根的檔案都被掃到、事件標 Root、manifest 各自獨立。
func TestRunDirectOnceMultiRootDryRun(t *testing.T) {
	base := t.TempDir()
	rootA := filepath.Join(base, "rootA")
	rootB := filepath.Join(base, "rootB")
	for _, d := range []string{rootA, rootB} {
		if err := os.MkdirAll(d, 0o755); err != nil {
			t.Fatal(err)
		}
	}
	if err := os.WriteFile(filepath.Join(rootA, "a.md"), []byte("# A"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(rootB, "b.md"), []byte("# B"), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg := &DirectConfig{
		WatchFolders: []string{rootA, rootB},
		Manifest:     filepath.Join(base, "manifest.json"),
		CypherURL:    "https://x.example", Namespace: "demo",
		MaxRemoved: DefaultMaxRemovedRatio,
	}
	results, exit, _ := RunDirectOnce(cfg, true)
	if exit != 0 {
		t.Fatalf("dry-run 不應失敗：%+v", results)
	}
	byRoot := map[string][]string{}
	for _, r := range results {
		if r.Status != "planned" {
			t.Fatalf("dry-run 事件應為 planned：%+v", r)
		}
		byRoot[r.Root] = append(byRoot[r.Root], r.Path)
	}
	if len(byRoot[rootA]) != 1 || byRoot[rootA][0] != "a.md" {
		t.Fatalf("rootA 事件錯：%v", byRoot[rootA])
	}
	if len(byRoot[rootB]) != 1 || byRoot[rootB][0] != "b.md" {
		t.Fatalf("rootB 事件錯：%v", byRoot[rootB])
	}
}

// t39：config 的 `~/` 由 daemon 端展開——安裝器成功頁下載的 config.json 用
// `~/.arcrun-rag/manifest.json` 這種人看的寫法，Go 不展開波浪號＝會去找字面上叫 "~" 的資料夾。
func TestLoadDirectConfigExpandsHome(t *testing.T) {
	home, err := os.UserHomeDir()
	if err != nil || home == "" {
		t.Skip("拿不到家目錄，跳過")
	}
	dir := t.TempDir()
	cfgPath := filepath.Join(dir, "config.json")
	body := `{
  "watch_folders": ["~/Documents/知識庫", "/tmp/絕對路徑不動"],
  "manifest": "~/.arcrun-rag/manifest.json",
  "cypher_url": "https://cypher.example.workers.dev",
  "namespace": "ns1"
}`
	if err := os.WriteFile(cfgPath, []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := LoadDirectConfig(cfgPath)
	if err != nil {
		t.Fatalf("LoadDirectConfig: %v", err)
	}
	wantManifest := filepath.Join(home, ".arcrun-rag/manifest.json")
	if cfg.Manifest != wantManifest {
		t.Errorf("manifest 未展開：got %q want %q", cfg.Manifest, wantManifest)
	}
	folders := cfg.Folders()
	wantFolder := filepath.Join(home, "Documents/知識庫")
	if folders[0] != wantFolder {
		t.Errorf("watch_folders[0] 未展開：got %q want %q", folders[0], wantFolder)
	}
	if folders[1] != "/tmp/絕對路徑不動" {
		t.Errorf("絕對路徑不該被動：got %q", folders[1])
	}
}

// ── t86b：manifest 分實例 ────────────────────────────────────────────────────

// ① 同資料夾、不同 instanceHost → 不同 manifest 路徑。
func TestManifestPathDifferentInstances(t *testing.T) {
	dir := t.TempDir()
	cfgA := &DirectConfig{
		WatchFolder: "/tmp/kb",
		Manifest:    filepath.Join(dir, "m.json"),
		CypherURL:   "https://instanceA.example.workers.dev",
		Namespace:   "demo",
	}
	cfgB := &DirectConfig{
		WatchFolder: "/tmp/kb",
		Manifest:    filepath.Join(dir, "m.json"),
		CypherURL:   "https://instanceB.example.workers.dev",
		Namespace:   "demo",
	}
	pA := cfgA.manifestPathFor("/tmp/kb")
	pB := cfgB.manifestPathFor("/tmp/kb")
	if pA == pB {
		t.Fatalf("① 不同實例相同資料夾應產生不同 manifest 路徑，got same: %s", pA)
	}
}

// ② 同 instance 同夾路徑 → 穩定且含尾碼。
func TestManifestPathStable(t *testing.T) {
	dir := t.TempDir()
	cfg := &DirectConfig{
		WatchFolder: "/tmp/kb",
		Manifest:    filepath.Join(dir, "m.json"),
		CypherURL:   "https://instance.workers.dev",
		Namespace:   "demo",
	}
	p1 := cfg.manifestPathFor("/tmp/kb")
	p2 := cfg.manifestPathFor("/tmp/kb")
	if p1 != p2 {
		t.Fatalf("② 相同 instance+路徑應穩定，got %s vs %s", p1, p2)
	}
	if p1 == cfg.Manifest {
		t.Fatal("② manifestPathFor 應含實例尾碼，不應沿用 cfg.Manifest 原路徑")
	}
}

// ③ 遷移：舊單根名（cfg.Manifest）存在、新名不存在 → rename 後讀得到既有 entries。
func TestManifestMigrateSingleRoot(t *testing.T) {
	dir := t.TempDir()
	cfg := &DirectConfig{
		WatchFolder: dir,
		Manifest:    filepath.Join(dir, "manifest.json"),
		CypherURL:   "https://instance.workers.dev",
		Namespace:   "demo",
		MaxRemoved:  DefaultMaxRemovedRatio,
	}
	absRoot, _ := filepath.Abs(dir)

	// 在舊路徑（cfg.Manifest）寫一份有資料的 manifest
	old := &Manifest{
		FolderID: "old-folder-id",
		Root:     absRoot,
		Entries:  map[string]*ManifestEntry{"doc.md": {ContentHash: "sha256:aabb", IngestedHash: "sha256:aabb", Size: 42}},
	}
	if err := old.Save(cfg.Manifest); err != nil {
		t.Fatal(err)
	}

	newPath := cfg.manifestPathFor(absRoot)
	if newPath == cfg.Manifest {
		t.Fatal("前提失效：新路徑應與舊路徑不同")
	}
	if _, err := os.Stat(newPath); err == nil {
		t.Fatal("新路徑不應已存在")
	}

	cfg.migrateManifestIfNeeded(absRoot, newPath)

	if _, err := os.Stat(cfg.Manifest); err == nil {
		t.Fatal("③ 遷移後舊路徑應已消失")
	}
	m, err := LoadManifest(newPath, absRoot)
	if err != nil {
		t.Fatalf("③ 遷移後讀取新路徑失敗：%v", err)
	}
	if _, ok := m.Entries["doc.md"]; !ok {
		t.Fatal("③ 遷移後 entries 應完整保留")
	}
}

// ③ 遷移：舊多根名（sha256(absRoot only)）存在 → rename 到新路徑（sha256(host+absRoot)）。
func TestManifestMigrateMultiRootOldFormula(t *testing.T) {
	dir := t.TempDir()
	cfg := &DirectConfig{
		WatchFolders: []string{dir},
		Manifest:     filepath.Join(dir, "manifest.json"),
		CypherURL:    "https://instance.workers.dev",
		Namespace:    "demo",
		MaxRemoved:   DefaultMaxRemovedRatio,
	}
	absRoot, _ := filepath.Abs(dir)

	// 計算舊多根路徑（只含路徑雜湊，無 instanceHost）
	sum := sha256.Sum256([]byte(absRoot))
	ext := filepath.Ext(cfg.Manifest)
	oldMultiPath := strings.TrimSuffix(cfg.Manifest, ext) + "-" + hex.EncodeToString(sum[:4]) + ext

	old := &Manifest{
		FolderID: "multi-old-id",
		Root:     absRoot,
		Entries:  map[string]*ManifestEntry{"wiki.md": {ContentHash: "sha256:cc00"}},
	}
	if err := old.Save(oldMultiPath); err != nil {
		t.Fatal(err)
	}

	newPath := cfg.manifestPathFor(absRoot)
	if newPath == oldMultiPath {
		t.Fatal("前提失效：新路徑應與舊多根路徑不同（instanceHost 加進去了）")
	}

	cfg.migrateManifestIfNeeded(absRoot, newPath)

	if _, err := os.Stat(oldMultiPath); err == nil {
		t.Fatal("③ 多根遷移後舊路徑應已消失")
	}
	m, err := LoadManifest(newPath, absRoot)
	if err != nil {
		t.Fatalf("③ 多根遷移後讀取失敗：%v", err)
	}
	if _, ok := m.Entries["wiki.md"]; !ok {
		t.Fatal("③ 多根遷移後 entries 應保留")
	}
}

// ④ 冪等：新名已存在 → 再跑 migrateManifestIfNeeded 不覆蓋新名內容。
func TestManifestMigrateIdempotent(t *testing.T) {
	dir := t.TempDir()
	cfg := &DirectConfig{
		WatchFolder: dir,
		Manifest:    filepath.Join(dir, "manifest.json"),
		CypherURL:   "https://instance.workers.dev",
		Namespace:   "demo",
		MaxRemoved:  DefaultMaxRemovedRatio,
	}
	absRoot, _ := filepath.Abs(dir)
	newPath := cfg.manifestPathFor(absRoot)

	// 直接在新路徑寫一份 manifest
	fresh := &Manifest{
		FolderID: "fresh-id",
		Root:     absRoot,
		Entries:  map[string]*ManifestEntry{"keep.md": {ContentHash: "sha256:dd11"}},
	}
	if err := fresh.Save(newPath); err != nil {
		t.Fatal(err)
	}

	// 也在舊路徑留一份（確認冪等時不被搬來蓋掉新名）
	stale := &Manifest{
		FolderID: "stale-id",
		Root:     absRoot,
		Entries:  map[string]*ManifestEntry{"old.md": {ContentHash: "sha256:ee22"}},
	}
	if err := stale.Save(cfg.Manifest); err != nil {
		t.Fatal(err)
	}

	// 跑兩次
	cfg.migrateManifestIfNeeded(absRoot, newPath)
	cfg.migrateManifestIfNeeded(absRoot, newPath)

	m, err := LoadManifest(newPath, absRoot)
	if err != nil {
		t.Fatalf("④ 冪等後讀取失敗：%v", err)
	}
	if _, ok := m.Entries["keep.md"]; !ok {
		t.Fatal("④ 冪等後新路徑內容不應被蓋掉")
	}
	if _, ok := m.Entries["old.md"]; ok {
		t.Fatal("④ 冪等後新路徑不應出現舊路徑的 entries")
	}
}

func TestExpandHomeEdgeCases(t *testing.T) {
	home, err := os.UserHomeDir()
	if err != nil || home == "" {
		t.Skip("拿不到家目錄，跳過")
	}
	cases := map[string]string{
		"~":            home,
		"~/a/b":        filepath.Join(home, "a/b"),
		"/abs/path":    "/abs/path",
		"relative/dir": "relative/dir",
		"":             "",
		"~notme/x":     "~notme/x", // 只認 `~/`；`~user` 形式不猜（Go 無法解析他人家目錄）
	}
	for in, want := range cases {
		if got := expandHome(in); got != want {
			t.Errorf("expandHome(%q)＝%q，want %q", in, got, want)
		}
	}
}