package gateway

import (
	"context"
	"encoding/json"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.yeij.top/AskaEth/Cyrene_v2/internal/auth"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/config"
	"git.yeij.top/AskaEth/Cyrene_v2/internal/db"
)

// newFileDB creates a real SQLite database file at dir/<name>, migrates it, and
// closes the handle, returning the file path. The gateway backup/restore
// endpoints open their own connections, so the handle is not held open here.
func newFileDB(t *testing.T, dir, name string) string {
	t.Helper()
	path := filepath.Join(dir, name)
	ctx := context.Background()
	conn, err := db.Open(ctx, path, gwTestLogger())
	if err != nil {
		t.Fatalf("open file db: %v", err)
	}
	if err := db.MigrateUp(ctx, conn, gwTestLogger()); err != nil {
		_ = conn.Close()
		t.Fatalf("migrate: %v", err)
	}
	if err := conn.Close(); err != nil {
		t.Fatalf("close file db: %v", err)
	}
	return path
}

// --- revoke-keys -------------------------------------------------------------

func TestAdminRevokeAllKeys(t *testing.T) {
	t.Parallel()
	keys := auth.NewAPIKey(config.AuthConfig{})
	for _, role := range []auth.Role{auth.RoleOwner, auth.RoleAdmin, auth.RoleViewer} {
		if _, err := keys.Generate(role); err != nil {
			t.Fatalf("generate key: %v", err)
		}
	}
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{Users: keys})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/revoke-keys", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var res struct {
		Revoked int `json:"revoked"`
	}
	if err := json.Unmarshal(decodeBody(t, body)["data"], &res); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if res.Revoked != 3 {
		t.Fatalf("revoked = %d, want 3", res.Revoked)
	}
	if len(keys.List()) != 0 {
		t.Fatalf("key table not empty after RevokeAll: %d", len(keys.List()))
	}
}

func TestAdminRevokeAllKeysUnwired(t *testing.T) {
	t.Parallel()
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{}) // no Users store
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/revoke-keys", nil, tok)
	if resp.StatusCode != http.StatusInternalServerError {
		t.Fatalf("status = %d, want 500 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
}

// --- rotate-jwt --------------------------------------------------------------

func TestAdminRotateJWT(t *testing.T) {
	t.Parallel()
	jwt := auth.New(config.AuthConfig{JWTSecret: testSecret})
	_, ts, _ := buildEnv(t, cfgDefault(), Deps{Auth: jwt})
	// The route is owner-only; verify an agent with the current secret passes.
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	newSecret := strings.Repeat("Z", 40)
	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/rotate-jwt",
		map[string]any{"newSecret": newSecret}, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var res struct {
		Rotated bool   `json:"rotated"`
		Note    string `json:"note"`
	}
	if err := json.Unmarshal(decodeBody(t, body)["data"], &res); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if !res.Rotated || res.Note == "" {
		t.Fatalf("res = %+v, want rotated with note", res)
	}
	// The pre-rotation token no longer verifies.
	if _, err := jwt.Verify(tok); err == nil {
		t.Fatal("pre-rotation token still verifies after RotateSecret")
	}
	// The new secret is never echoed back in the body, nor is a short one accepted.
	if strings.Contains(string(body), newSecret) {
		t.Fatalf("new secret leaked in response body: %s", body)
	}
}

func TestAdminRotateJWTShortSecret(t *testing.T) {
	t.Parallel()
	jwt := auth.New(config.AuthConfig{JWTSecret: testSecret})
	_, ts, _ := buildEnv(t, cfgDefault(), Deps{Auth: jwt})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/rotate-jwt",
		map[string]any{"newSecret": "short"}, tok)
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
	// The previous secret stays intact after a rejected rotation.
	if _, err := jwt.Verify(tok); err != nil {
		t.Fatalf("token invalid after rejected rotation: %v", err)
	}
}

func TestAdminRotateJWTMissingSecret(t *testing.T) {
	t.Parallel()
	jwt := auth.New(config.AuthConfig{JWTSecret: testSecret})
	_, ts, _ := buildEnv(t, cfgDefault(), Deps{Auth: jwt})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, _ := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/rotate-jwt",
		map[string]any{"newSecret": "   "}, tok)
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400", resp.StatusCode)
	}
}

// --- backup ------------------------------------------------------------------

func TestAdminBackupProducesFile(t *testing.T) {
	t.Parallel()
	dir := t.TempDir()
	dbPath := newFileDB(t, dir, "cyrene.db")
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{DatabasePath: dbPath})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/backup", nil, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var res struct {
		Path string `json:"path"`
		Size int64  `json:"size"`
	}
	if err := json.Unmarshal(decodeBody(t, body)["data"], &res); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if !strings.HasPrefix(res.Path, dir) {
		t.Fatalf("backup path %q is not under data dir %q", res.Path, dir)
	}
	if res.Size <= 0 {
		t.Fatalf("backup size = %d, want > 0", res.Size)
	}
	if info, err := os.Stat(res.Path); err != nil || info.Size() != res.Size {
		t.Fatalf("backup file stat = (%v, %d), want no error and size %d", err, info.Size(), res.Size)
	}
}

func TestAdminBackupUnwired(t *testing.T) {
	t.Parallel()
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{}) // no DatabasePath
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/backup", nil, tok)
	if resp.StatusCode != http.StatusInternalServerError {
		t.Fatalf("status = %d, want 500 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
}

// --- restore -----------------------------------------------------------------

func TestAdminRestoreReplacesAndPreBacksUp(t *testing.T) {
	t.Parallel()
	dir := t.TempDir()
	dbPath := newFileDB(t, dir, "cyrene.db")
	backupSrc := newFileDB(t, dir, "backup.db")

	// Make the backup source clearly different from the live db by appending a
	// marker. Restore only copies bytes and never opens the source, so the marker
	// survives into the replaced live file and proves the swap happened.
	srcFile, err := os.OpenFile(backupSrc, os.O_WRONLY|os.O_APPEND, 0o644)
	if err != nil {
		t.Fatalf("open backup source: %v", err)
	}
	if _, err := srcFile.WriteString("RESTORE-MARKER"); err != nil {
		t.Fatalf("append marker: %v", err)
	}
	if err := srcFile.Close(); err != nil {
		t.Fatalf("close backup source: %v", err)
	}
	liveBefore, err := os.ReadFile(dbPath)
	if err != nil {
		t.Fatalf("read live db before: %v", err)
	}

	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{DatabasePath: dbPath})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	// No pre-existing backups yet.
	before, _ := filepath.Glob(filepath.Join(dir, "backup-*.db"))
	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/restore",
		map[string]any{"path": backupSrc}, tok)
	if resp.StatusCode != http.StatusOK {
		t.Fatalf("status = %d, want 200 (body=%s)", resp.StatusCode, body)
	}
	var res struct {
		Restored bool   `json:"restored"`
		Backup   string `json:"backup"`
		Note     string `json:"note"`
	}
	if err := json.Unmarshal(decodeBody(t, body)["data"], &res); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if !res.Restored || res.Note == "" {
		t.Fatalf("res = %+v, want restored with note", res)
	}
	// The current DB was snapshotted before the replace (a new backup appeared).
	after, _ := filepath.Glob(filepath.Join(dir, "backup-*.db"))
	if len(after) != len(before)+1 {
		t.Fatalf("backup count before=%d after=%d, want one more pre-restore snapshot", len(before), len(after))
	}
	// The live DB was replaced with the backup source's bytes, so it now carries
	// the marker and differs from its pre-restore content.
	liveAfter, err := os.ReadFile(dbPath)
	if err != nil {
		t.Fatalf("read live db after: %v", err)
	}
	if !strings.Contains(string(liveAfter), "RESTORE-MARKER") {
		t.Fatalf("live db not replaced (marker missing); before len=%d after len=%d", len(liveBefore), len(liveAfter))
	}
	if string(liveAfter) == string(liveBefore) {
		t.Fatal("live db unchanged after restore")
	}
}

func TestAdminRestoreRejectsTraversal(t *testing.T) {
	t.Parallel()
	dir := t.TempDir()     // data dir
	outside := t.TempDir() // a sibling directory, outside the data dir
	dbPath := newFileDB(t, dir, "cyrene.db")
	outsideBackup := newFileDB(t, outside, "outside.db")

	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{DatabasePath: dbPath})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/restore",
		map[string]any{"path": outsideBackup}, tok)
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
}

func TestAdminRestoreRejectsMissingFile(t *testing.T) {
	t.Parallel()
	dir := t.TempDir()
	dbPath := newFileDB(t, dir, "cyrene.db")

	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{DatabasePath: dbPath})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)

	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/restore",
		map[string]any{"path": filepath.Join(dir, "does-not-exist.db")}, tok)
	if resp.StatusCode != http.StatusNotFound {
		t.Fatalf("status = %d, want 404 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
}

func TestAdminRestoreUnwired(t *testing.T) {
	t.Parallel()
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{}) // no DatabasePath
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	resp, body := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/restore",
		map[string]any{"path": "x"}, tok)
	if resp.StatusCode != http.StatusInternalServerError {
		t.Fatalf("status = %d, want 500 (body=%s)", resp.StatusCode, body)
	}
	wantErrorShape(t, body)
}

func TestAdminRestoreRequiresPath(t *testing.T) {
	t.Parallel()
	dir := t.TempDir()
	dbPath := newFileDB(t, dir, "cyrene.db")
	_, ts, jwt := buildEnv(t, cfgDefault(), Deps{DatabasePath: dbPath})
	tok := signAny(t, jwt, "acct", auth.RoleOwner)
	resp, _ := doReq(t, http.MethodPost, ts.URL+"/api/v1/admin/system/restore", map[string]any{"path": ""}, tok)
	if resp.StatusCode != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400", resp.StatusCode)
	}
}