package store

import (
	"errors"
	"testing"
)

// 临时会话 store 契约（U1）：一个 scratch 项目 + 恰好一个私有会话，
// 项目列表不出现它，会话列表仍然出现它，标记不可被客户端写入改动。

func scratchAccountFixture(t *testing.T, st *Store, owner string, admin bool) {
	t.Helper()
	if err := st.CreateAccount(owner, owner, "", admin); err != nil {
		t.Fatal(err)
	}
}

func TestScratchSessionCreatesOnePrivateConversationUnderScratchProject(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)

	project, conversation, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatalf("create scratch session: %v", err)
	}
	if !IsScratchProject(project.Settings) {
		t.Fatalf("project is not marked scratch: %+v", project.Settings)
	}
	if string(project.Owner) != "alice" || project.ID == "" {
		t.Fatalf("unexpected project: %+v", project)
	}
	if string(conversation.ProjectID) != string(project.ID) || string(conversation.Owner) != "alice" {
		t.Fatalf("conversation is not under the scratch project: %+v", conversation)
	}
	if !conversation.CrossPrivate || !conversation.AllowCrossRead {
		t.Fatalf("scratch conversation must be private and cross-readable: %+v", conversation)
	}
	// 读回的项目行带着同一个标记，判定只有 IsScratchProject 一个来源。
	stored, err := st.GetProject("alice", string(project.ID))
	if err != nil || !IsScratchProject(stored.Settings) {
		t.Fatalf("stored project marker: %+v %v", stored.Settings, err)
	}
}

func TestScratchProjectsStayOutOfProjectListsButNotConversationLists(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	scratchAccountFixture(t, st, "bob", false)

	normal, err := st.CreateProject("alice", "普通项目")
	if err != nil {
		t.Fatal(err)
	}
	project, conversation, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}
	// 他人的 scratch 也不进全量候选（共享适配器枚举）。
	if _, _, err := st.CreateScratchSessionAccountChecked("bob", "临时会话", "临时会话", "", false); err != nil {
		t.Fatal(err)
	}

	projects, err := st.ListProjects("alice")
	if err != nil {
		t.Fatal(err)
	}
	if len(projects) != 1 || projects[0].ID != normal.ID {
		t.Fatalf("ListProjects must hide scratch projects: %+v", projects)
	}
	all, err := st.ListAllProjects()
	if err != nil {
		t.Fatal(err)
	}
	if len(all) != 1 || all[0].ID != normal.ID {
		t.Fatalf("ListAllProjects must hide scratch projects: %+v", all)
	}
	// 侧栏任务列表仍然要能看到临时会话。
	tasks, err := st.ListTasks("alice", false)
	if err != nil {
		t.Fatal(err)
	}
	found := false
	for _, task := range tasks {
		if task.ID == conversation.ID {
			found = true
		}
	}
	if !found {
		t.Fatalf("ListTasks dropped the scratch conversation: %+v", tasks)
	}
	conversations, err := st.ListConversations("alice", string(project.ID))
	if err != nil || len(conversations) != 1 || conversations[0].ID != conversation.ID {
		t.Fatalf("ListConversations under scratch: %+v %v", conversations, err)
	}
}

func TestScratchProjectRefusesSecondConversationOnEveryStoreCreatePath(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	project, _, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}
	// account-checked 路径由服务端共用的会话创建入口（createPrivateConversation，
	// 覆盖 POST /api/projects/{id}/conversations 与 /new）先行拒绝，见
	// internal/server/scratch_session_test.go；这里的 store 契约覆盖本文件内
	// 的两个创建函数。
	for name, create := range map[string]func() error{
		"legacy": func() error {
			_, err := st.CreateConversation("alice", string(project.ID), "第二个", "")
			return err
		},
		"shared": func() error {
			_, err := st.CreateConversationInProject("alice", string(project.ID), "第二个", "")
			return err
		},
	} {
		if err := create(); !errors.Is(err, ErrScratchSessionSingle) {
			t.Fatalf("%s path allowed a second conversation: %v", name, err)
		}
	}
	conversations, err := st.ListConversations("alice", string(project.ID))
	if err != nil || len(conversations) != 1 {
		t.Fatalf("refused create still wrote a row: %+v %v", conversations, err)
	}
	// 普通项目不受影响。
	normal, err := st.CreateProjectAccountChecked("alice", "普通项目", false)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := st.CreateConversationAccountChecked("alice", string(normal.ID), "正常会话", "", false, true); err != nil {
		t.Fatalf("normal project lost conversation create: %v", err)
	}
}

func TestScratchHostMarkerIsServerOwned(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	scratchAccountFixture(t, st, "bob", false)
	normal, err := st.CreateProjectAccountChecked("alice", "普通项目", false)
	if err != nil {
		t.Fatal(err)
	}
	project, _, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}

	// 普通项目不能被加上标记（两种写入路径都不行）。
	for name, write := range map[string]func(id string) error{
		"legacy": func(id string) error {
			return st.UpdateProjectSettings("alice", id, ScratchHostSettings())
		},
		"account-checked": func(id string) error {
			return st.UpdateProjectSettingsAccountChecked("alice", id, ScratchHostSettings(), false)
		},
	} {
		if err := write(string(normal.ID)); !errors.Is(err, ErrScratchMarkerReserved) {
			t.Fatalf("%s path added the scratch marker: %v", name, err)
		}
	}
	// scratch 项目也不能被摘掉标记。
	cleared := map[string]any{"host": map[string]any{"kind": "normal"}}
	if err := st.UpdateProjectSettings("alice", string(project.ID), cleared); !errors.Is(err, ErrScratchMarkerReserved) {
		t.Fatalf("scratch marker cleared: %v", err)
	}
	if err := st.UpdateProjectSettingsAccountChecked("alice", string(project.ID), map[string]any{"host": nil}, false); !errors.Is(err, ErrScratchMarkerReserved) {
		t.Fatalf("scratch marker dropped by null: %v", err)
	}
	// 不改变标记的普通写入照旧放行。
	if err := st.UpdateProjectSettings("alice", string(project.ID), map[string]any{"note": "保留标记"}); err != nil {
		t.Fatalf("unrelated settings write refused: %v", err)
	}
	kept, err := st.GetProject("alice", string(project.ID))
	if err != nil || !IsScratchProject(kept.Settings) || kept.Settings["note"] != "保留标记" {
		t.Fatalf("scratch project settings after unrelated write: %+v %v", kept.Settings, err)
	}
	if err := st.UpdateProjectSettings("alice", string(normal.ID), map[string]any{"note": "普通"}); err != nil {
		t.Fatalf("normal project settings write refused: %v", err)
	}
}

func TestScratchSessionCreateFollowsAccountState(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "admin", true)
	scratchAccountFixture(t, st, "alice", false)

	if _, _, err := st.CreateScratchSessionAccountChecked("missing", "临时会话", "临时会话", "", false); !errors.Is(err, ErrAccountForbidden) {
		t.Fatalf("unknown actor created a scratch session: %v", err)
	}
	account, err := st.GetAccountByOwner("alice")
	if err != nil {
		t.Fatal(err)
	}
	if _, err := st.SetAccountEnabled("admin", account.ID, account.StateVersion, false); err != nil {
		t.Fatal(err)
	}
	if _, _, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false); !errors.Is(err, ErrAccountForbidden) {
		t.Fatalf("disabled account created a scratch session: %v", err)
	}
	projects, err := st.ListProjects("alice")
	if err != nil || len(projects) != 0 {
		t.Fatalf("refused create left a project row: %+v %v", projects, err)
	}
}

func TestScratchSessionTransactionLeavesNothingOnFailure(t *testing.T) {
	st := openTestStore(t)
	// 缺账号时事务回滚，项目与会话都不落库。
	if _, _, err := st.CreateScratchSessionAccountChecked("ghost", "临时会话", "临时会话", "", false); !errors.Is(err, ErrAccountForbidden) {
		t.Fatalf("ghost actor: %v", err)
	}
	all, err := st.ListAllProjects()
	if err != nil || len(all) != 0 {
		t.Fatalf("rolled back create left rows: %+v %v", all, err)
	}
}

// ---- U2：隔离门禁的 store 契约 ----

// IsScratchProjectID / ScratchProjectDecision 是所有门禁唯一的判定来源：
// 属主放行，其他人 NotFound，普通项目不接管（交回原判定面）。
func TestScratchProjectLookupAndOwnershipDecision(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	scratchAccountFixture(t, st, "bob", false)
	project, conversation, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}
	normal, err := st.CreateProjectAccountChecked("alice", "普通项目", false)
	if err != nil {
		t.Fatal(err)
	}

	for _, tc := range []struct {
		name      string
		projectID string
		scratch   bool
		err       error
	}{
		{"scratch", string(project.ID), true, nil},
		{"normal", string(normal.ID), false, nil},
		{"empty", "", false, nil},
		{"missing", "prj_missing", false, ErrNotFound},
	} {
		got, err := st.IsScratchProjectID(tc.projectID)
		if got != tc.scratch || !errors.Is(err, tc.err) {
			t.Fatalf("%s: IsScratchProjectID = %v, %v (want %v, %v)", tc.name, got, err, tc.scratch, tc.err)
		}
	}

	// 属主：门禁接管并放行（不查 RDM）。
	handled, err := st.ScratchProjectDecision(string(project.ID), "alice")
	if !handled || err != nil {
		t.Fatalf("scratch owner decision = %v, %v", handled, err)
	}
	// 其他人：NotFound——临时会话不是共享资源。
	if handled, err := st.ScratchProjectDecision(string(project.ID), "bob"); !handled || !errors.Is(err, ErrNotFound) {
		t.Fatalf("scratch non-owner decision = %v, %v", handled, err)
	}
	// 普通项目与空项目 id 都不接管，原路径继续。
	if handled, err := st.ScratchProjectDecision(string(normal.ID), "bob"); handled || err != nil {
		t.Fatalf("normal project decision = %v, %v", handled, err)
	}
	if handled, err := st.ScratchProjectDecision("", "bob"); handled || err != nil {
		t.Fatalf("empty project decision = %v, %v", handled, err)
	}
	// 读不到的项目不按临时会话处理（不因此放宽任何门禁）。
	if handled, err := st.ScratchProjectDecision("prj_missing", "alice"); handled || err != nil {
		t.Fatalf("missing project decision = %v, %v", handled, err)
	}
	_ = conversation
}

// ScratchProjectIDs 只报属主自己的 scratch 项目：列表响应靠它给会话打标，
// 所以普通项目与他人临时会话都不在里面。
func TestScratchProjectIDsCoverOnlyOwnScratchProjects(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	scratchAccountFixture(t, st, "bob", false)
	scratch, _, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}
	second, _, err := st.CreateScratchSessionAccountChecked("alice", "方案草稿", "方案草稿", "", false)
	if err != nil {
		t.Fatal(err)
	}
	normal, err := st.CreateProjectAccountChecked("alice", "普通项目", false)
	if err != nil {
		t.Fatal(err)
	}
	other, _, err := st.CreateScratchSessionAccountChecked("bob", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}

	ids, err := st.ScratchProjectIDs("alice")
	if err != nil {
		t.Fatal(err)
	}
	if len(ids) != 2 || !ids[string(scratch.ID)] || !ids[string(second.ID)] {
		t.Fatalf("alice scratch ids = %+v", ids)
	}
	if ids[string(normal.ID)] {
		t.Fatalf("normal project marked scratch: %+v", ids)
	}
	// 租户边界：他人的临时会话不出现在 alice 的集合里。
	if ids[string(other.ID)] {
		t.Fatalf("other owner's scratch project leaked: %+v", ids)
	}
	others, err := st.ScratchProjectIDs("bob")
	if err != nil {
		t.Fatal(err)
	}
	if len(others) != 1 || !others[string(other.ID)] {
		t.Fatalf("bob scratch ids = %+v", others)
	}
	// 没有项目的人拿到空集合而不是 nil 之外的东西（判空与遍历都安全）。
	if empty, err := st.ScratchProjectIDs("carol"); err != nil || len(empty) != 0 {
		t.Fatalf("empty scratch ids = %+v, %v", empty, err)
	}
}

// 删掉临时会话的唯一会话即删掉它的 scratch 项目（不留空壳）；普通项目照旧。
func TestDeletingScratchConversationDeletesScratchProject(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	scratchAccountFixture(t, st, "bob", false)
	project, conversation, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}

	// 他人删除：仍然 NotFound，且临时会话原样存在。
	if err := st.DeleteConversationAccountChecked("bob", string(conversation.ID), false); !errors.Is(err, ErrNotFound) {
		t.Fatalf("non-owner delete = %v", err)
	}
	if _, err := st.ProjectMetadata(string(project.ID)); err != nil {
		t.Fatalf("non-owner delete removed the scratch project: %v", err)
	}

	if err := st.DeleteConversationAccountChecked("alice", string(conversation.ID), false); err != nil {
		t.Fatalf("owner delete: %v", err)
	}
	if _, err := st.ProjectMetadata(string(project.ID)); !errors.Is(err, ErrNotFound) {
		t.Fatalf("scratch project survived its only conversation: %v", err)
	}
	if scratch, err := st.IsScratchProjectID(string(project.ID)); scratch || !errors.Is(err, ErrNotFound) {
		t.Fatalf("deleted scratch project still answers as scratch: %v %v", scratch, err)
	}

	// 普通项目的会话删除不动项目。
	normal, err := st.CreateProjectAccountChecked("alice", "普通项目", false)
	if err != nil {
		t.Fatal(err)
	}
	conv, err := st.CreateConversationAccountChecked("alice", string(normal.ID), "会话", "", false, true)
	if err != nil {
		t.Fatal(err)
	}
	if err := st.DeleteConversationAccountChecked("alice", string(conv.ID), false); err != nil {
		t.Fatal(err)
	}
	if _, err := st.ProjectMetadata(string(normal.ID)); err != nil {
		t.Fatalf("normal project removed with its conversation: %v", err)
	}
}

// legacy DeleteConversation 是同一条语义：删会话即删临时会话外壳。
func TestLegacyDeleteConversationCascadesScratchProject(t *testing.T) {
	st := openTestStore(t)
	scratchAccountFixture(t, st, "alice", false)
	project, conversation, err := st.CreateScratchSessionAccountChecked("alice", "临时会话", "临时会话", "", false)
	if err != nil {
		t.Fatal(err)
	}
	if err := st.DeleteConversation("alice", string(conversation.ID)); err != nil {
		t.Fatalf("legacy delete: %v", err)
	}
	if _, err := st.ProjectMetadata(string(project.ID)); !errors.Is(err, ErrNotFound) {
		t.Fatalf("legacy delete left the scratch shell: %v", err)
	}
}