package public

import (
	"context"
	"errors"
	customermodel "git.sendico.io/tech/sxchnge/product/customers/model"
	sessionmodel "git.sendico.io/tech/sxchnge/product/sessions/model"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"git.sendico.io/tech/sxchnge/product/auth/config"
	"git.sendico.io/tech/sxchnge/product/auth/request"
	"git.sendico.io/tech/sxchnge/shared/errors"
	"git.sendico.io/tech/sxchnge/shared/service"
	"github.com/go-chi/chi/v5"
	"go.uber.org/zap"
)

func TestLoginRejectsUnknownClientID(t *testing.T) {
	testRejectsUnknownClientID(t, "/login", `{
		"login":{"login":"user@example.com","password":"correct horse battery staple"},
		"clientId":"missing-client",
		"deviceId":"device-1"
	}`, 0, func(router *PublicRouter, req *http.Request) http.HandlerFunc {
		return router.login(req)
	})
}

func TestAPILoginRejectsUnknownClientID(t *testing.T) {
	testRejectsUnknownClientID(t, "/login/api", `{
		"login":{"login":"user@example.com","password":"correct horse battery staple"},
		"clientId":"missing-client",
		"deviceId":"device-1",
		"clientSecret":"secret"
	}`, 1, func(router *PublicRouter, req *http.Request) http.HandlerFunc {
		return router.apiLogin(req)
	})
}

func TestLoginAuthenticatesAgainstInjectedAccountStorage(t *testing.T) {
	account := testActiveAccount(t)
	unusedDB := &testAccountDB{err: merrors.ErrNoData}
	activeDB := &testAccountDB{result: account}
	router := &PublicRouter{
		logger:  zap.NewNop(),
		db:      activeDB,
		service: mservice.Accounts,
	}

	got, failed, h := router.authenticateAccount(context.Background(), &srequest.Login{
		LoginData: customermodel.LoginData{
			UserDataBase: customermodel.UserDataBase{
				Login: "user@example.com",
			},
			Password: "correct horse battery staple",
		},
	})
	if h != nil {
		t.Fatal("expected login authentication to succeed against injected account store")
	}
	if failed {
		t.Fatal("successful login was classified as a credential failure")
	}
	if got == nil || got.Login != account.Login {
		t.Fatalf("expected account %q, got %#v", account.Login, got)
	}
	if activeDB.getByEmailCalls != 1 {
		t.Fatalf("expected one active account store lookup, got %d", activeDB.getByEmailCalls)
	}
	if unusedDB.getByEmailCalls != 0 {
		t.Fatalf("expected no unused account store lookups, got %d", unusedDB.getByEmailCalls)
	}
}

func testRejectsUnknownClientID(
	t *testing.T,
	path string,
	body string,
	wantLookups int,
	handler func(*PublicRouter, *http.Request) http.HandlerFunc,
) {
	t.Helper()

	account := testActiveAccount(t)
	accountDB := &testAccountDB{result: account}
	router := &PublicRouter{
		logger:  zap.NewNop(),
		db:      accountDB,
		rtdb:    &testRefreshTokenDB{clientErr: merrors.ErrNoData},
		service: mservice.Accounts,
	}

	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, path, strings.NewReader(body))
	rec := httptest.NewRecorder()

	handler(router, req)(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected status %d, got %d", http.StatusUnauthorized, rec.Code)
	}
	if accountDB.getByEmailCalls != wantLookups {
		t.Fatalf("expected %d account lookups, got %d", wantLookups, accountDB.getByEmailCalls)
	}

	resp := decodeErrorResponse(t, rec.Body.Bytes())
	if resp.Data.Details != "unknown client id" {
		t.Fatalf("expected unknown client id message, got %q", resp.Data.Details)
	}
}

func TestLoginRejectsPendingVerificationAccount(t *testing.T) {
	account := testAccountWithStatus(t, customermodel.AccountPendingVerification)
	router := &PublicRouter{
		logger:  zap.NewNop(),
		db:      &testAccountDB{result: account},
		service: mservice.Accounts,
	}

	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", strings.NewReader(`{
		"login":{"login":"user@example.com","password":"correct horse battery staple"}
	}`))
	rec := httptest.NewRecorder()

	router.login(req)(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Fatalf("expected status %d, got %d", http.StatusForbidden, rec.Code)
	}
	resp := decodeErrorResponse(t, rec.Body.Bytes())
	if resp.Data.Details != "Account verification required" {
		t.Fatalf("expected account verification required message, got %q", resp.Data.Details)
	}
}

func TestLoginRejectsBlockedAccount(t *testing.T) {
	account := testAccountWithStatus(t, customermodel.AccountBlocked)
	router := &PublicRouter{
		logger:  zap.NewNop(),
		db:      &testAccountDB{result: account},
		service: mservice.Accounts,
	}

	req := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login", strings.NewReader(`{
		"login":{"login":"user@example.com","password":"correct horse battery staple"}
	}`))
	rec := httptest.NewRecorder()

	router.login(req)(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Fatalf("expected status %d, got %d", http.StatusForbidden, rec.Code)
	}
	resp := decodeErrorResponse(t, rec.Body.Bytes())
	if resp.Data.Details != "Account verification required" {
		t.Fatalf("expected account verification required message, got %q", resp.Data.Details)
	}
}

func TestAPILoginAllowsLoginAgainAfterRevokeSameSession(t *testing.T) {
	account := testActiveAccount(t)
	clientID := "api-client"
	deviceID := "device-1"

	rtdb := &testRefreshTokenDB{
		client: &sessionmodel.Client{
			ClientID:                clientID,
			ClientSecret:            "secret",
			GrantTypes:              []string{"password"},
			TokenEndpointAuthMethod: "client_secret_post",
			AccountRef:              account.GetID(),
		},
	}

	var cfg middleware.TokenConfig
	cfg.Length = 16
	cfg.Expiration.Account = 1
	cfg.Expiration.Refresh = 24

	signature := middleware.Signature{
		Algorithm:  "HS256",
		PrivateKey: []byte("test-secret"),
	}

	router := NewRouter(
		zap.NewNop(),
		"/",
		&testAccountDB{result: account},
		nil,
		rtdb,
		nil,
		chi.NewRouter(),
		&cfg,
		&signature,
		middleware.LoginRateLimits{},
	)

	body := `{
		"login":{"login":"user@example.com","password":"correct horse battery staple"},
		"clientId":"api-client",
		"deviceId":"device-1",
		"clientSecret":"secret"
	}`

	firstReq := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login/api", strings.NewReader(body))
	firstRec := httptest.NewRecorder()
	router.apiLogin(firstReq)(firstRec, firstReq)

	if firstRec.Code != http.StatusOK {
		t.Fatalf("expected first login status %d, got %d", http.StatusOK, firstRec.Code)
	}
	firstResp := decodeLoginResponse(t, firstRec.Body.Bytes())
	if firstResp.Data.RefreshToken.Token == "" {
		t.Fatal("expected first login to return refresh token")
	}

	err := rtdb.Revoke(context.Background(), *account.GetID(), &sessionmodel.SessionIdentifier{
		ClientID: clientID,
		DeviceID: deviceID,
	})
	if err != nil {
		t.Fatalf("failed to revoke refresh token: %v", err)
	}

	secondReq := httptest.NewRequestWithContext(context.Background(), http.MethodPost, "/login/api", strings.NewReader(body))
	secondRec := httptest.NewRecorder()
	router.apiLogin(secondReq)(secondRec, secondReq)

	if secondRec.Code != http.StatusOK {
		t.Fatalf("expected second login status %d, got %d", http.StatusOK, secondRec.Code)
	}
	secondResp := decodeLoginResponse(t, secondRec.Body.Bytes())
	if secondResp.Data.RefreshToken.Token == "" {
		t.Fatal("expected second login to return refresh token")
	}
	if secondResp.Data.RefreshToken.Token == firstResp.Data.RefreshToken.Token {
		t.Fatal("expected second login to issue a different refresh token after revocation")
	}

	_, err = rtdb.GetByCRT(context.Background(), &sessionmodel.ClientRefreshToken{
		SessionIdentifier: sessionmodel.SessionIdentifier{
			ClientID: clientID,
			DeviceID: deviceID,
		},
		RefreshToken: firstResp.Data.RefreshToken.Token,
	})
	if !errors.Is(err, merrors.ErrNoData) {
		t.Fatalf("expected old refresh token to be unusable, got %v", err)
	}

	_, err = rtdb.GetByCRT(context.Background(), &sessionmodel.ClientRefreshToken{
		SessionIdentifier: sessionmodel.SessionIdentifier{
			ClientID: clientID,
			DeviceID: deviceID,
		},
		RefreshToken: secondResp.Data.RefreshToken.Token,
	})
	if err != nil {
		t.Fatalf("expected new refresh token to be active, got %v", err)
	}

	if got := rtdb.tokenCountForSession(*account.GetID(), clientID, deviceID); got != 2 {
		t.Fatalf("expected 2 refresh token records for session, got %d", got)
	}
	if got := rtdb.activeTokenCountForSession(*account.GetID(), clientID, deviceID); got != 1 {
		t.Fatalf("expected 1 active refresh token for session, got %d", got)
	}
}