package service

import (
	"context"
	"errors"
	"fmt"
	"time"

	"github.com/google/uuid"
	"github.com/muyuqingfeng/iloom/auth-service/internal/model"
	"github.com/muyuqingfeng/iloom/auth-service/internal/repository"
	"github.com/muyuqingfeng/iloom/shared/pkg/auth"
	sgrpc "github.com/muyuqingfeng/iloom/shared/pkg/grpc"
)

var roleIDMap = map[string]string{
	"purchaser": "r_010",
	"textile":   "r_011",
	"washing":   "r_012",
}

type AuthService struct {
	profileRepo *repository.ProfileRepo
	compRepo    *repository.CompanyRepo
	memberRepo  *repository.MemberRepo
	sysClient   *sgrpc.SystemClient
	jwt         *auth.JWTManager
}

func NewAuthService(
	profileRepo *repository.ProfileRepo,
	compRepo *repository.CompanyRepo,
	memberRepo *repository.MemberRepo,
	sysClient *sgrpc.SystemClient,
	jwt *auth.JWTManager,
) *AuthService {
	return &AuthService{
		profileRepo: profileRepo,
		compRepo:    compRepo,
		memberRepo:  memberRepo,
		sysClient:   sysClient,
		jwt:         jwt,
	}
}

type RegisterRequest struct {
	Username    string `json:"username"`
	Password    string `json:"password"`
	CompanyName string `json:"company_name"`
	Role        string `json:"role"`
}

type LoginResponse struct {
	AccessToken  string         `json:"access_token"`
	RefreshToken string         `json:"refresh_token"`
	User         *model.Profile `json:"user"`
	Company      *model.Company `json:"company"`
}

type ProfileWithCompany struct {
	User    *model.Profile `json:"user"`
	Company *model.Company `json:"company,omitempty"`
}

func (s *AuthService) Register(ctx context.Context, req RegisterRequest) (*LoginResponse, error) {
	roleID, ok := roleIDMap[req.Role]
	if !ok {
		return nil, errors.New("invalid role")
	}

	userID, err := s.sysClient.CreateUser(ctx, req.Username, req.Password, "", "", roleID)
	if err != nil {
		return nil, fmt.Errorf("create user: %w", err)
	}

	now := time.Now()
	companyID := uuid.New().String()
	company := &model.Company{
		ID:        companyID,
		Name:      req.CompanyName,
		Role:      req.Role,
		Status:    1,
		CreatedAt: now,
	}
	if err := s.compRepo.Create(ctx, company); err != nil {
		return nil, fmt.Errorf("create company: %w", err)
	}

	member := &model.CompanyMember{
		ID:        uuid.New().String(),
		CompanyID: companyID,
		UserID:    userID,
		Role:      "owner",
		IsMaster:  true,
		CreatedAt: now,
	}
	if err := s.memberRepo.Create(ctx, member); err != nil {
		return nil, fmt.Errorf("create member: %w", err)
	}

	profile := &model.Profile{
		ID:          userID,
		Username:    req.Username,
		CompanyID:   companyID,
		CompanyName: req.CompanyName,
		Role:        req.Role,
		IsMaster:    true,
		CreatedAt:   now,
	}

	return s.generateTokens(profile, company)
}

func (s *AuthService) Login(ctx context.Context, username, password string) (*LoginResponse, error) {
	result, err := s.sysClient.Login(ctx, username, password, "")
	if err != nil {
		return nil, errors.New("invalid credentials")
	}

	profile, err := s.profileRepo.GetWithCompany(ctx, result.UserID)
	if err != nil {
		return nil, fmt.Errorf("get profile: %w", err)
	}
	if profile == nil {
		profile = &model.Profile{
			ID:       result.UserID,
			Username: result.Username,
			RealName: result.RealName,
			Avatar:   result.Avatar,
		}
	}

	var company *model.Company
	if profile.CompanyID != "" {
		company, err = s.compRepo.GetByID(ctx, profile.CompanyID)
		if err != nil {
			return nil, fmt.Errorf("get company: %w", err)
		}
	}

	return s.generateTokens(profile, company)
}

func (s *AuthService) RefreshToken(ctx context.Context, refreshToken string) (string, error) {
	userID, err := s.jwt.ParseRefreshToken(refreshToken)
	if err != nil {
		return "", fmt.Errorf("invalid refresh token: %w", err)
	}

	profile, err := s.profileRepo.GetWithCompany(ctx, userID)
	if err != nil {
		return "", fmt.Errorf("get user: %w", err)
	}
	if profile == nil {
		return "", errors.New("user not found")
	}

	claims := auth.Claims{
		UserID:    profile.ID,
		CompanyID: profile.CompanyID,
		Role:      profile.Role,
		IsMaster:  profile.IsMaster,
		Username:  profile.Username,
	}

	return s.jwt.GenerateAccessToken(claims)
}

func (s *AuthService) GetMe(ctx context.Context, userID string) (*ProfileWithCompany, error) {
	profile, err := s.profileRepo.GetWithCompany(ctx, userID)
	if err != nil {
		return nil, fmt.Errorf("get profile: %w", err)
	}
	if profile == nil {
		return nil, errors.New("user not found")
	}

	result := &ProfileWithCompany{User: profile}
	if profile.CompanyID != "" {
		company, err := s.compRepo.GetByID(ctx, profile.CompanyID)
		if err != nil {
			return nil, fmt.Errorf("get company: %w", err)
		}
		result.Company = company
	}

	return result, nil
}

func (s *AuthService) generateTokens(profile *model.Profile, company *model.Company) (*LoginResponse, error) {
	role := profile.Role
	if role == "" && company != nil {
		role = company.Role
	}

	claims := auth.Claims{
		UserID:    profile.ID,
		CompanyID: profile.CompanyID,
		Role:      role,
		IsMaster:  profile.IsMaster,
		Username:  profile.Username,
	}

	accessToken, err := s.jwt.GenerateAccessToken(claims)
	if err != nil {
		return nil, fmt.Errorf("generate access token: %w", err)
	}

	refreshToken, err := s.jwt.GenerateRefreshToken(profile.ID)
	if err != nil {
		return nil, fmt.Errorf("generate refresh token: %w", err)
	}

	return &LoginResponse{
		AccessToken:  accessToken,
		RefreshToken: refreshToken,
		User:         profile,
		Company:      company,
	}, nil
}