package service

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"errors"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"git.umbrella.haus/ae/notatest/pkg/data"
	"github.com/golang-jwt/jwt/v5"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
)

type mockTokenStore struct {
	CreateRefreshTokenFunc         func(context.Context, data.CreateRefreshTokenParams) (data.RefreshToken, error)
	GetRefreshTokenByHashFunc      func(context.Context, string) (data.RefreshToken, error)
	RevokeRefreshTokenFunc         func(context.Context, string) error
	RevokeAllUserRefreshTokensFunc func(context.Context, uuid.UUID) error
}

func (m *mockTokenStore) CreateRefreshToken(ctx context.Context, arg data.CreateRefreshTokenParams) (data.RefreshToken, error) {
	return m.CreateRefreshTokenFunc(ctx, arg)
}

func (m *mockTokenStore) GetRefreshTokenByHash(ctx context.Context, tokenHash string) (data.RefreshToken, error) {
	return m.GetRefreshTokenByHashFunc(ctx, tokenHash)
}

func (m *mockTokenStore) RevokeRefreshToken(ctx context.Context, token string) error {
	return m.RevokeRefreshTokenFunc(ctx, token)
}

func (m *mockTokenStore) RevokeAllUserRefreshTokens(ctx context.Context, id uuid.UUID) error {
	return m.RevokeAllUserRefreshTokensFunc(ctx, id)
}

func TestGenerateTokenPair_Success(t *testing.T) {
	userID := uuid.New()
	called := false

	mockStore := &mockTokenStore{
		CreateRefreshTokenFunc: func(ctx context.Context, arg data.CreateRefreshTokenParams) (data.RefreshToken, error) {
			called = true
			assert.Equal(t, userID, arg.UserID)
			return data.RefreshToken{}, nil
		},
	}

	ts := tokenService{
		JWTSecret: "test-secret",
		Tokens:    mockStore,
	}

	pair, err := ts.GenerateTokenPair(context.Background(), userID, false)
	assert.NoError(t, err)
	assert.True(t, called)
	assert.NotEmpty(t, pair.AccessToken)
	assert.NotEmpty(t, pair.RefreshToken)
}

func TestGenerateTokenPair_DBError(t *testing.T) {
	mockStore := &mockTokenStore{
		CreateRefreshTokenFunc: func(ctx context.Context, arg data.CreateRefreshTokenParams) (data.RefreshToken, error) {
			return data.RefreshToken{}, errors.New("db error")
		},
	}

	ts := tokenService{Tokens: mockStore}
	_, err := ts.GenerateTokenPair(context.Background(), uuid.New(), false)
	assert.ErrorContains(t, err, "db error")
}

func TestValidateRefreshToken_Valid(t *testing.T) {
	token := "valid-jwt-token"
	hash := sha256.Sum256([]byte(token))
	expectedHash := hex.EncodeToString(hash[:])

	mockStore := &mockTokenStore{
		GetRefreshTokenByHashFunc: func(ctx context.Context, tokenHash string) (data.RefreshToken, error) {
			assert.Equal(t, expectedHash, tokenHash)
			return data.RefreshToken{ExpiresAt: time.Now().Add(1 * time.Hour)}, nil
		},
	}

	ts := tokenService{Tokens: mockStore}
	_, err := ts.ValidateRefreshToken(context.Background(), token)
	assert.NoError(t, err)
}

func TestRefreshAccessToken_Success(t *testing.T) {
	userID := uuid.New()
	refreshToken := "valid-jwt-token"

	// Expected hash of the test token
	hash := sha256.Sum256([]byte(refreshToken))
	expectedHash := hex.EncodeToString(hash[:])

	mockStore := &mockTokenStore{
		GetRefreshTokenByHashFunc: func(ctx context.Context, tokenHash string) (data.RefreshToken, error) {
			assert.Equal(t, expectedHash, tokenHash)

			// Must return an unrevoked token with future expiration
			return data.RefreshToken{
				TokenHash: tokenHash,
				ExpiresAt: time.Now().Add(1 * time.Hour),
				Revoked:   false,
			}, nil
		},
		RevokeRefreshTokenFunc: func(ctx context.Context, tokenHash string) error {
			assert.Equal(t, expectedHash, tokenHash)
			return nil
		},
		CreateRefreshTokenFunc: func(ctx context.Context, arg data.CreateRefreshTokenParams) (data.RefreshToken, error) {
			return data.RefreshToken{}, nil
		},
	}

	ts := tokenService{
		JWTSecret: "test-secret",
		Tokens:    mockStore,
	}

	req := httptest.NewRequest("POST", "/", nil)
	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", refreshToken))
	req = req.WithContext(context.WithValue(
		req.Context(),
		userCtxKey{},
		&userClaims{
			Admin:     false,
			TokenType: "refresh",
			RegisteredClaims: jwt.RegisteredClaims{
				Subject: userID.String(),
			},
		},
	))

	w := httptest.NewRecorder()
	ts.RefreshAccessToken(w, req)

	assert.Equal(t, http.StatusOK, w.Code)
	assert.Contains(t, w.Body.String(), "access_token", "refresh_token")
}

func TestHandleLogout_Success(t *testing.T) {
	userID := uuid.New()
	called := false

	mockStore := &mockTokenStore{
		RevokeAllUserRefreshTokensFunc: func(ctx context.Context, id uuid.UUID) error {
			called = true
			assert.Equal(t, userID, id)
			return nil
		},
	}

	ts := tokenService{Tokens: mockStore}

	req := httptest.NewRequest("POST", "/", nil)
	req = req.WithContext(context.WithValue(
		req.Context(),
		userCtxKey{},
		&userClaims{
			RegisteredClaims: jwt.RegisteredClaims{
				ID: userID.String(),
			},
		},
	))

	w := httptest.NewRecorder()
	ts.HandleLogout(w, req)

	assert.True(t, called)
	assert.Equal(t, http.StatusOK, w.Code)
}