package app

import (
	"context"
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"strconv"
	"strings"
	"sync"
	"testing"
	"time"

	"codex-helper/internal/security"
	"codex-helper/internal/store"
)

func TestSystemStatusRejectsNonGETMethods(t *testing.T) {
	a := newReminderTestApp(t)
	recorder := httptest.NewRecorder()
	request := httptest.NewRequest(http.MethodPost, "/api/v1/system/status", nil)
	a.api(recorder, request)
	if recorder.Code != http.StatusMethodNotAllowed {
		t.Fatalf("status = %d, body = %s", recorder.Code, recorder.Body.String())
	}
}

func TestSystemStatusReturnsBuildVersion(t *testing.T) {
	a := newReminderTestApp(t)
	originalVersion := Version
	Version = "1.2.3-test"
	t.Cleanup(func() { Version = originalVersion })
	recorder := httptest.NewRecorder()
	request := httptest.NewRequest(http.MethodGet, "/api/v1/system/status", nil)
	a.api(recorder, request)
	if recorder.Code != http.StatusOK {
		t.Fatalf("status = %d, body = %s", recorder.Code, recorder.Body.String())
	}
	var body struct {
		Version string `json:"version"`
	}
	if err := json.Unmarshal(recorder.Body.Bytes(), &body); err != nil {
		t.Fatal(err)
	}
	if body.Version != "1.2.3-test" {
		t.Fatalf("version = %q; want %q", body.Version, "1.2.3-test")
	}
}

func TestDashboardSerializesNilListsAsEmptyArrays(t *testing.T) {
	a := newReminderTestApp(t)
	if err := a.store.Set("initialized", "true"); err != nil {
		t.Fatal(err)
	}
	a.runtimes[1] = &accountRuntime{}
	_, err := a.store.DB.Exec("INSERT INTO sessions(token_hash,expires_at,created_at) VALUES(?,?,?)", security.HashToken("test-session"), time.Now().Add(time.Hour).Unix(), time.Now().Unix())
	if err != nil {
		t.Fatal(err)
	}
	recorder := httptest.NewRecorder()
	request := httptest.NewRequest(http.MethodGet, "/api/v1/dashboard?accountId=1", nil)
	request.AddCookie(&http.Cookie{Name: "session", Value: "test-session"})
	a.api(recorder, request)
	if recorder.Code != http.StatusOK {
		t.Fatalf("status = %d, body = %s", recorder.Code, recorder.Body.String())
	}
	var body struct {
		Limits []LimitBucket `json:"limits"`
		Usage  []UsagePoint  `json:"usage"`
	}
	if err := json.Unmarshal(recorder.Body.Bytes(), &body); err != nil {
		t.Fatal(err)
	}
	if body.Limits == nil || body.Usage == nil {
		t.Fatalf("nil lists in response: %s", recorder.Body.String())
	}
}

func TestAnonymousOverviewIsReadOnly(t *testing.T) {
	a := newReminderTestApp(t)
	if err := a.store.Set("initialized", "true"); err != nil {
		t.Fatal(err)
	}
	email := "owner@example.com"
	plan := "plus"
	if err := a.store.UpdateAccount(1, &email, &plan, true); err != nil {
		t.Fatal(err)
	}
	publicVisible := true
	if err := a.store.UpdateAccountSettingsWithVisibility(1, "默认账号", "any", &publicVisible); err != nil {
		t.Fatal(err)
	}
	a.runtimes[1] = &accountRuntime{
		dash: Dashboard{
			AccountID:   1,
			DisplayName: "默认账号",
			Account:     AccountView{Email: &email, PlanType: &plan, Connected: true},
			Limits:      []LimitBucket{},
			Usage:       []UsagePoint{},
			FetchedAt:   time.Now().Unix(),
		},
	}

	accountsRecorder := httptest.NewRecorder()
	a.api(accountsRecorder, httptest.NewRequest(http.MethodGet, "/api/v1/accounts", nil))
	if accountsRecorder.Code != http.StatusOK {
		t.Fatalf("anonymous accounts status = %d, body = %s", accountsRecorder.Code, accountsRecorder.Body.String())
	}
	var accounts []struct {
		Email           *string `json:"email"`
		ExpectedKind    string  `json:"expectedKind"`
		PublicVisible   bool    `json:"publicVisible"`
		ValidationState string  `json:"validationStatus"`
	}
	if err := json.Unmarshal(accountsRecorder.Body.Bytes(), &accounts); err != nil {
		t.Fatal(err)
	}
	if len(accounts) != 1 || accounts[0].Email != nil || !accounts[0].PublicVisible || accounts[0].ExpectedKind != "any" || accounts[0].ValidationState != "unknown" {
		t.Fatalf("anonymous account data = %#v; sensitive account fields were not redacted", accounts)
	}

	dashboardRecorder := httptest.NewRecorder()
	a.api(dashboardRecorder, httptest.NewRequest(http.MethodGet, "/api/v1/dashboard?accountId=1", nil))
	if dashboardRecorder.Code != http.StatusOK {
		t.Fatalf("anonymous dashboard status = %d, body = %s", dashboardRecorder.Code, dashboardRecorder.Body.String())
	}
	var publicDashboardBody Dashboard
	if err := json.Unmarshal(dashboardRecorder.Body.Bytes(), &publicDashboardBody); err != nil {
		t.Fatal(err)
	}
	if publicDashboardBody.Account.Email != nil || publicDashboardBody.Account.AuthMode != nil {
		t.Fatalf("anonymous dashboard account = %#v; identity fields were not redacted", publicDashboardBody.Account)
	}

	for _, path := range []string{"/api/v1/settings/general", "/api/v1/accounts", "/api/v1/accounts/1/sync"} {
		recorder := httptest.NewRecorder()
		method := http.MethodGet
		if path == "/api/v1/accounts" || strings.HasSuffix(path, "/sync") {
			method = http.MethodPost
		}
		a.api(recorder, httptest.NewRequest(method, path, nil))
		if recorder.Code != http.StatusUnauthorized {
			t.Fatalf("anonymous %s status = %d, body = %s; configuration must require login", path, recorder.Code, recorder.Body.String())
		}
	}

	session := "test-session"
	if _, err := a.store.DB.Exec("INSERT INTO sessions(token_hash,expires_at,created_at) VALUES(?,?,?)", security.HashToken(session), time.Now().Add(time.Hour).Unix(), time.Now().Unix()); err != nil {
		t.Fatal(err)
	}
	privateRecorder := httptest.NewRecorder()
	privateRequest := httptest.NewRequest(http.MethodGet, "/api/v1/dashboard?accountId=1", nil)
	privateRequest.AddCookie(&http.Cookie{Name: "session", Value: session})
	a.api(privateRecorder, privateRequest)
	if privateRecorder.Code != http.StatusOK {
		t.Fatalf("authenticated dashboard status = %d, body = %s", privateRecorder.Code, privateRecorder.Body.String())
	}
	var privateDashboardBody Dashboard
	if err := json.Unmarshal(privateRecorder.Body.Bytes(), &privateDashboardBody); err != nil {
		t.Fatal(err)
	}
	if privateDashboardBody.Account.Email == nil || *privateDashboardBody.Account.Email != email {
		t.Fatalf("authenticated dashboard email = %v; want %q", privateDashboardBody.Account.Email, email)
	}
	configRecorder := httptest.NewRecorder()
	configRequest := httptest.NewRequest(http.MethodPut, "/api/v1/settings/general", strings.NewReader(`{"timezone":"UTC","theme":"system","syncMinutes":5,"retentionDays":90,"beforeMinutes":30,"notifyBefore":true,"notifyAfter":true}`))
	configRequest.AddCookie(&http.Cookie{Name: "session", Value: session})
	configRequest.Header.Set("X-Requested-With", "codex-helper")
	a.api(configRecorder, configRequest)
	if configRecorder.Code != http.StatusOK {
		t.Fatalf("authenticated settings status = %d, body = %s", configRecorder.Code, configRecorder.Body.String())
	}
}

func TestAccountVisibilityFiltersAnonymousOverviewAndCanBeUpdated(t *testing.T) {
	a := newReminderTestApp(t)
	if err := a.store.Set("initialized", "true"); err != nil {
		t.Fatal(err)
	}
	publicAccount, err := a.store.CreateAccountWithVisibility("公开账号", "team", true)
	if err != nil {
		t.Fatal(err)
	}
	privateAccount, err := a.store.CreateAccount("私有账号", "personal")
	if err != nil {
		t.Fatal(err)
	}
	a.runtimes[publicAccount.ID] = &accountRuntime{}
	a.runtimes[privateAccount.ID] = &accountRuntime{}

	accountsRecorder := httptest.NewRecorder()
	a.api(accountsRecorder, httptest.NewRequest(http.MethodGet, "/api/v1/accounts", nil))
	if accountsRecorder.Code != http.StatusOK {
		t.Fatalf("anonymous accounts status = %d, body = %s", accountsRecorder.Code, accountsRecorder.Body.String())
	}
	var visible []struct {
		ID            int64 `json:"id"`
		PublicVisible bool  `json:"publicVisible"`
	}
	if err := json.Unmarshal(accountsRecorder.Body.Bytes(), &visible); err != nil {
		t.Fatal(err)
	}
	if len(visible) != 1 || visible[0].ID != publicAccount.ID || !visible[0].PublicVisible {
		t.Fatalf("anonymous accounts = %#v; want only public account %d", visible, publicAccount.ID)
	}

	privateDashboard := httptest.NewRecorder()
	privatePath := "/api/v1/dashboard?accountId=" + strconv.FormatInt(privateAccount.ID, 10)
	a.api(privateDashboard, httptest.NewRequest(http.MethodGet, privatePath, nil))
	if privateDashboard.Code != http.StatusNotFound {
		t.Fatalf("anonymous private dashboard status = %d, body = %s", privateDashboard.Code, privateDashboard.Body.String())
	}

	publicDashboard := httptest.NewRecorder()
	publicPath := "/api/v1/dashboard?accountId=" + strconv.FormatInt(publicAccount.ID, 10)
	a.api(publicDashboard, httptest.NewRequest(http.MethodGet, publicPath, nil))
	if publicDashboard.Code != http.StatusOK {
		t.Fatalf("anonymous public dashboard status = %d, body = %s", publicDashboard.Code, publicDashboard.Body.String())
	}

	session := "visibility-session"
	if _, err := a.store.DB.Exec("INSERT INTO sessions(token_hash,expires_at,created_at) VALUES(?,?,?)", security.HashToken(session), time.Now().Add(time.Hour).Unix(), time.Now().Unix()); err != nil {
		t.Fatal(err)
	}
	createRecorder := httptest.NewRecorder()
	createRequest := httptest.NewRequest(http.MethodPost, "/api/v1/accounts", strings.NewReader(`{"displayName":"接口公开账号","expectedKind":"team","publicVisible":true}`))
	createRequest.AddCookie(&http.Cookie{Name: "session", Value: session})
	createRequest.Header.Set("X-Requested-With", "codex-helper")
	a.api(createRecorder, createRequest)
	if createRecorder.Code != http.StatusCreated {
		t.Fatalf("authenticated account creation status = %d, body = %s", createRecorder.Code, createRecorder.Body.String())
	}
	var created store.Account
	if err := json.Unmarshal(createRecorder.Body.Bytes(), &created); err != nil {
		t.Fatal(err)
	}
	if !created.PublicVisible {
		t.Fatalf("created account = %#v; want publicVisible=true", created)
	}
	authenticatedAccounts := httptest.NewRecorder()
	authenticatedRequest := httptest.NewRequest(http.MethodGet, "/api/v1/accounts", nil)
	authenticatedRequest.AddCookie(&http.Cookie{Name: "session", Value: session})
	a.api(authenticatedAccounts, authenticatedRequest)
	if authenticatedAccounts.Code != http.StatusOK {
		t.Fatalf("authenticated accounts status = %d, body = %s", authenticatedAccounts.Code, authenticatedAccounts.Body.String())
	}
	var all []struct {
		ID int64 `json:"id"`
	}
	if err := json.Unmarshal(authenticatedAccounts.Body.Bytes(), &all); err != nil {
		t.Fatal(err)
	}
	if len(all) != 4 {
		t.Fatalf("authenticated accounts = %#v; want default, public, private, and newly created accounts", all)
	}

	anonymousUpdate := httptest.NewRecorder()
	anonymousUpdateRequest := httptest.NewRequest(http.MethodPut, "/api/v1/accounts/"+strconv.FormatInt(privateAccount.ID, 10), strings.NewReader(`{"displayName":"私有账号","expectedKind":"personal","publicVisible":true}`))
	a.api(anonymousUpdate, anonymousUpdateRequest)
	if anonymousUpdate.Code != http.StatusUnauthorized {
		t.Fatalf("anonymous visibility update status = %d, body = %s", anonymousUpdate.Code, anonymousUpdate.Body.String())
	}

	authenticatedUpdate := httptest.NewRecorder()
	authenticatedUpdateRequest := httptest.NewRequest(http.MethodPut, "/api/v1/accounts/"+strconv.FormatInt(privateAccount.ID, 10), strings.NewReader(`{"displayName":"私有账号","expectedKind":"personal","publicVisible":true}`))
	authenticatedUpdateRequest.AddCookie(&http.Cookie{Name: "session", Value: session})
	authenticatedUpdateRequest.Header.Set("X-Requested-With", "codex-helper")
	a.api(authenticatedUpdate, authenticatedUpdateRequest)
	if authenticatedUpdate.Code != http.StatusOK {
		t.Fatalf("authenticated visibility update status = %d, body = %s", authenticatedUpdate.Code, authenticatedUpdate.Body.String())
	}
	updated, err := a.store.Account(privateAccount.ID)
	if err != nil {
		t.Fatal(err)
	}
	if !updated.PublicVisible {
		t.Fatalf("updated account = %#v; want publicVisible=true", updated)
	}
}

func TestCurrentTokenCycleUsesLongestWindowAndFiltersDailyUsage(t *testing.T) {
	now := time.Date(2026, time.August, 14, 12, 0, 0, 0, time.UTC)
	reset := time.Date(2026, time.August, 15, 0, 0, 0, 0, time.UTC)
	cycle := currentTokenCycle(
		[]LimitBucket{
			{
				LimitID:               "codex",
				WindowType:            "primary",
				WindowDurationMinutes: 300,
				ResetsAt:              now.Add(5 * time.Hour).Unix(),
			},
			{
				LimitID:               "codex",
				WindowType:            "secondary",
				WindowDurationMinutes: 7 * 24 * 60,
				ResetsAt:              reset.Unix(),
			},
		},
		[]UsagePoint{
			{Date: "2026-08-07", TotalTokens: 50},
			{Date: "2026-08-08", TotalTokens: 100},
			{Date: "2026-08-10", TotalTokens: 200},
			{Date: "2026-08-14", TotalTokens: 300},
			{Date: "2026-08-15", TotalTokens: 400},
		},
		now.Unix(),
	)
	if cycle == nil {
		t.Fatal("currentTokenCycle() returned nil")
	}
	if cycle.WindowType != "secondary" || cycle.WindowDurationMinutes != 7*24*60 {
		t.Fatalf("cycle window = %#v; want the seven-day secondary window", cycle)
	}
	if cycle.StartedAt != time.Date(2026, time.August, 8, 0, 0, 0, 0, time.UTC).Unix() {
		t.Fatalf("cycle start = %d; want 2026-08-08", cycle.StartedAt)
	}
	if cycle.ResetsAt != reset.Unix() || cycle.TotalTokens != 600 {
		t.Fatalf("cycle = %#v; want reset %d and 600 tokens", cycle, reset.Unix())
	}
}

func TestCurrentTokenCycleRequiresAValidFutureResetWindow(t *testing.T) {
	cycle := currentTokenCycle(
		[]LimitBucket{{WindowDurationMinutes: 0, ResetsAt: 1}},
		[]UsagePoint{{Date: "2026-08-14", TotalTokens: 100}},
		time.Date(2026, time.August, 14, 12, 0, 0, 0, time.UTC).Unix(),
	)
	if cycle != nil {
		t.Fatalf("currentTokenCycle() = %#v; want nil", cycle)
	}
}

func TestPeakDailyTokensUsesOnlyTheCurrentTokenCycle(t *testing.T) {
	now := time.Date(2026, time.August, 14, 12, 0, 0, 0, time.UTC)
	cycle := &TokenCycle{
		StartedAt: time.Date(2026, time.August, 8, 0, 0, 0, 0, time.UTC).Unix(),
		ResetsAt:  time.Date(2026, time.August, 15, 0, 0, 0, 0, time.UTC).Unix(),
	}
	peak := peakDailyTokensForCycle(cycle, []UsagePoint{
		{Date: "2026-08-07", TotalTokens: 900},
		{Date: "2026-08-08", TotalTokens: 100},
		{Date: "2026-08-10", TotalTokens: 200},
		{Date: "2026-08-14", TotalTokens: 300},
		{Date: "2026-08-15", TotalTokens: 800},
	}, now.Unix())
	if peak == nil || *peak != 300 {
		t.Fatalf("cycle peak = %v; want 300", peak)
	}
}

func TestFlattenLimitReadsAppServerWindowDuration(t *testing.T) {
	var limit rawLimit
	if err := json.Unmarshal([]byte(`{
		"limitId":"codex",
		"primary":{"usedPercent":20,"windowDurationMins":10080,"resetsAt":1787197043}
	}`), &limit); err != nil {
		t.Fatal(err)
	}
	flattened := flattenLimit(limit)
	if len(flattened) != 1 || flattened[0].WindowDurationMinutes != 10080 {
		t.Fatalf("flattened limit = %#v; want a 10080-minute window", flattened)
	}
}

type fakeCodexClient struct {
	mu          sync.Mutex
	connected   bool
	starts      int
	initializes int
	closes      int
	calls       int
	initErrors  []error
	initStarted chan struct{}
	initRelease chan struct{}
}

func (f *fakeCodexClient) Start(context.Context) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.starts++
	f.connected = true
	return nil
}

func (f *fakeCodexClient) Initialize(context.Context) error {
	f.mu.Lock()
	f.initializes++
	var err error
	if len(f.initErrors) > 0 {
		err, f.initErrors = f.initErrors[0], f.initErrors[1:]
	}
	started, release := f.initStarted, f.initRelease
	f.mu.Unlock()
	if started != nil {
		select {
		case started <- struct{}{}:
		default:
		}
	}
	if release != nil {
		<-release
	}
	return err
}

func (f *fakeCodexClient) Call(_ context.Context, method string, _ any, out any) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.calls++
	if method == "account/login/start" {
		result := out.(*map[string]any)
		*result = map[string]any{"verificationUrl": "https://example.test/device", "userCode": "ABCD-EFGH"}
	}
	return nil
}

func (f *fakeCodexClient) Close() error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.closes++
	f.connected = false
	return nil
}

func (f *fakeCodexClient) Connected() bool {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.connected
}

func (f *fakeCodexClient) counts() (starts, initializes, closes, calls int) {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.starts, f.initializes, f.closes, f.calls
}

func TestEnsureReadySerializesColdStart(t *testing.T) {
	client := &fakeCodexClient{}
	rt := &accountRuntime{client: client}
	var wg sync.WaitGroup
	errs := make(chan error, 8)
	for range 8 {
		wg.Add(1)
		go func() {
			defer wg.Done()
			errs <- rt.ensureReady(context.Background())
		}()
	}
	wg.Wait()
	close(errs)
	for err := range errs {
		if err != nil {
			t.Fatal(err)
		}
	}
	starts, initializes, _, _ := client.counts()
	if starts != 1 || initializes != 1 {
		t.Fatalf("cold starts = %d, initializes = %d; want 1 each", starts, initializes)
	}
}

func TestEnsureReadyRetriesAfterInitializeFailure(t *testing.T) {
	client := &fakeCodexClient{initErrors: []error{errors.New("handshake failed")}}
	rt := &accountRuntime{client: client}
	if err := rt.ensureReady(context.Background()); err == nil {
		t.Fatal("first initialization unexpectedly succeeded")
	}
	if err := rt.ensureReady(context.Background()); err != nil {
		t.Fatalf("retry failed: %v", err)
	}
	starts, initializes, closes, _ := client.counts()
	if starts != 2 || initializes != 2 || closes != 1 {
		t.Fatalf("starts = %d, initializes = %d, closes = %d; want 2, 2, 1", starts, initializes, closes)
	}
}

func TestStopWaitsForStartupAndPreventsRestart(t *testing.T) {
	started := make(chan struct{}, 1)
	release := make(chan struct{})
	client := &fakeCodexClient{initStarted: started, initRelease: release}
	rt := &accountRuntime{client: client}
	readyDone := make(chan error, 1)
	go func() { readyDone <- rt.ensureReady(context.Background()) }()
	<-started
	stopDone := make(chan struct{})
	go func() { rt.stop(); close(stopDone) }()
	close(release)
	if err := <-readyDone; err != nil {
		t.Fatalf("startup failed: %v", err)
	}
	<-stopDone
	if err := rt.ensureReady(context.Background()); !errors.Is(err, errRuntimeStopped) {
		t.Fatalf("restart error = %v; want stopped", err)
	}
	starts, initializes, closes, _ := client.counts()
	if starts != 1 || initializes != 1 || closes != 1 {
		t.Fatalf("starts = %d, initializes = %d, closes = %d; want 1 each", starts, initializes, closes)
	}
}

func TestDeviceLoginStartsColdRuntime(t *testing.T) {
	client := &fakeCodexClient{}
	a := &App{runtimes: map[int64]*accountRuntime{2: {client: client}}}
	recorder := httptest.NewRecorder()
	request := httptest.NewRequest("POST", "/api/v1/accounts/2/login/device", nil)
	a.deviceLogin(recorder, request, 2)
	if recorder.Code != 200 {
		t.Fatalf("status = %d, body = %s", recorder.Code, recorder.Body.String())
	}
	starts, initializes, _, calls := client.counts()
	if starts != 1 || initializes != 1 || calls != 1 {
		t.Fatalf("starts = %d, initializes = %d, calls = %d; want 1 each", starts, initializes, calls)
	}
}

func TestAccountClassificationReadyRequiresConnectedKnownPlan(t *testing.T) {
	team := "team"
	unknown := "unknown"
	tests := []struct {
		name    string
		account AccountView
		want    bool
	}{
		{name: "disconnected", account: AccountView{PlanType: &team}, want: false},
		{name: "missing plan", account: AccountView{Connected: true}, want: false},
		{name: "unknown plan", account: AccountView{Connected: true, PlanType: &unknown}, want: false},
		{name: "classified", account: AccountView{Connected: true, PlanType: &team}, want: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			rt := &accountRuntime{dash: Dashboard{Account: tt.account}}
			if got := accountClassificationReady(rt); got != tt.want {
				t.Fatalf("accountClassificationReady() = %v; want %v", got, tt.want)
			}
		})
	}
}