package user

import (
	"strconv"
	"tm/pkg/authorization"
	"tm/pkg/logger"
	"tm/pkg/response"

	"github.com/asaskevich/govalidator"
	"github.com/google/uuid"
	"github.com/labstack/echo/v4"
)

// Handler handles HTTP requests for user operations
type Handler struct {
	service     Service
	logger      logger.Logger
	validator   ValidationService
	authService authorization.AuthorizationService
}

// NewUserHandler creates a new user handler
func NewUserHandler(service Service, logger logger.Logger, validator ValidationService, authService authorization.AuthorizationService) *Handler {
	return &Handler{
		service:     service,
		logger:      logger,
		validator:   validator,
		authService: authService,
	}
}

// RegisterRoutes registers user routes
func (h *Handler) RegisterRoutes(e *echo.Echo) {
	v1 := e.Group("/api/v1")

	userGroup := v1.Group("/users")
	{
		// Public routes
		userGroup.POST("/login", h.Login)
		userGroup.POST("/refresh-token", h.RefreshToken)
		userGroup.POST("/reset-password", h.ResetPassword)

		// Protected routes (require authentication)
		authGroup := userGroup.Group("")
		// authGroup.Use(h.AuthMiddleware())
		{
			authGroup.GET("/profile", h.GetProfile)
			authGroup.PUT("/profile", h.UpdateProfile)
			authGroup.PUT("/change-password", h.ChangePassword)
			authGroup.POST("/logout", h.Logout)

			// Admin routes
			adminGroup := authGroup.Group("/admin")
			// adminGroup.Use(h.AdminMiddleware())
			{
				adminGroup.POST("", h.CreateUser)
				adminGroup.GET("", h.ListUsers)
				adminGroup.GET("/:id", h.GetUserByID)
				adminGroup.PUT("/:id", h.UpdateUser)
				adminGroup.DELETE("/:id", h.DeleteUser)
				adminGroup.PUT("/:id/status", h.UpdateUserStatus)
				adminGroup.PUT("/:id/role", h.UpdateUserRole)
				adminGroup.GET("/company/:company_id", h.GetUsersByCompanyID)
				adminGroup.GET("/role/:role", h.GetUsersByRole)
			}
		}
	}
}

// Login handles user login
// @Summary Login user
// @Description Authenticate user with email/username and password
// @Tags users
// @Accept json
// @Produce json
// @Param login body LoginForm true "Login credentials"
// @Success 200 {object} response.APIResponse{data=AuthResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/login [post]
func (h *Handler) Login(c echo.Context) error {
	form, err := response.Parse[LoginForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Call service
	authResponse, err := h.service.Login(c.Request().Context(), form)
	if err != nil {
		return response.Unauthorized(c, err.Error())
	}

	return response.Success(c, authResponse, "Login successful")
}

// RefreshToken handles token refresh
// @Summary Refresh access token
// @Description Refresh access token using refresh token
// @Tags users
// @Accept json
// @Produce json
// @Param refresh body RefreshTokenForm true "Refresh token"
// @Success 200 {object} response.APIResponse{data=AuthResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/refresh-token [post]
func (h *Handler) RefreshToken(c echo.Context) error {
	form, err := response.Parse[RefreshTokenForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	authResponse, err := h.service.RefreshToken(c.Request().Context(), form.RefreshToken)
	if err != nil {
		return response.Unauthorized(c, err.Error())
	}

	return response.Success(c, authResponse, "Token refreshed successfully")
}

// ResetPassword handles password reset request
// @Summary Reset password
// @Description Send password reset email to user
// @Tags users
// @Accept json
// @Produce json
// @Param reset body ResetPasswordForm true "Password reset request"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/reset-password [post]
func (h *Handler) ResetPassword(c echo.Context) error {
	form, err := response.Parse[ResetPasswordForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	err = h.service.ResetPassword(c.Request().Context(), form)
	if err != nil {
		return response.InternalServerError(c, "Failed to process password reset")
	}

	return response.Success(c, map[string]interface{}{
		"message": "Password reset email sent successfully",
	}, "Password reset initiated")
}

// GetProfile gets current user profile
// @Summary Get user profile
// @Description Get current user profile information
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {object} response.APIResponse{data=UserResponse}
// @Failure 401 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/profile [get]
func (h *Handler) GetProfile(c echo.Context) error {
	// Extract user ID from JWT token context
	userID, err := GetUserIDFromContext(c)
	if err != nil {
		return response.Unauthorized(c, "User not authenticated")
	}

	user, err := h.service.GetProfile(c.Request().Context(), userID)
	if err != nil {
		return response.NotFound(c, "User not found")
	}

	return response.Success(c, user.ToResponse(), "Profile retrieved successfully")
}

// UpdateProfile updates current user profile
// @Summary Update user profile
// @Description Update current user profile information
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param profile body UpdateUserForm true "Profile update data"
// @Success 200 {object} response.APIResponse{data=UserResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/profile [put]
func (h *Handler) UpdateProfile(c echo.Context) error {
	// TODO: Extract user ID from JWT token
	userID := uuid.New() // Placeholder - should be extracted from JWT

	form, err := response.Parse[UpdateUserForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	user, err := h.service.UpdateUser(c.Request().Context(), userID, form, &userID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, user.ToResponse(), "Profile updated successfully")
}

// ChangePassword changes current user password
// @Summary Change password
// @Description Change current user password
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param password body ChangePasswordForm true "Password change data"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/change-password [put]
func (h *Handler) ChangePassword(c echo.Context) error {
	// TODO: Extract user ID from JWT token
	userID := uuid.New() // Placeholder - should be extracted from JWT

	form, err := response.Parse[ChangePasswordForm](c)
	if err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	err = h.service.ChangePassword(c.Request().Context(), userID, form)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, map[string]interface{}{
		"message": "Password changed successfully",
	}, "Password changed successfully")
}

// Logout handles user logout
// @Summary Logout user
// @Description Logout current user and invalidate tokens
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/logout [post]
func (h *Handler) Logout(c echo.Context) error {
	// Extract user ID and access token from context
	userID, err := GetUserIDFromContext(c)
	if err != nil {
		return response.Unauthorized(c, "User not authenticated")
	}

	accessToken, err := GetAccessTokenFromContext(c)
	if err != nil {
		return response.Unauthorized(c, "Access token not found")
	}

	err = h.service.Logout(c.Request().Context(), userID, accessToken)
	if err != nil {
		return response.InternalServerError(c, "Failed to logout")
	}

	return response.Success(c, map[string]interface{}{
		"message": "Logged out successfully",
	}, "Logged out successfully")
}

// CreateUser creates a new user (admin only)
// @Summary Create user
// @Description Create a new user (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param user body CreateUserForm true "User creation data"
// @Success 201 {object} response.APIResponse{data=UserResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin [post]
func (h *Handler) CreateUser(c echo.Context) error {
	// Get current user ID from JWT token
	currentUserID, err := GetUserIDFromContext(c)
	if err != nil {
		return response.Unauthorized(c, "User not authenticated")
	}

	var form CreateUserForm
	if err := c.Bind(&form); err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	// Call service
	user, err := h.service.CreateUser(c.Request().Context(), &form, &currentUserID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Created(c, user.ToResponse(), "User created successfully")
}

// ListUsers lists users with search and filters (admin only)
// @Summary List users
// @Description List users with search and filters (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param search query string false "Search term"
// @Param status query string false "User status filter"
// @Param role query string false "User role filter"
// @Param company_id query string false "Company ID filter"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Param sort_by query string false "Sort field"
// @Param sort_order query string false "Sort order"
// @Success 200 {object} response.APIResponse{data=UserListResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin [get]
func (h *Handler) ListUsers(c echo.Context) error {
	var form ListUsersForm
	if err := c.Bind(&form); err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	// Call service
	users, err := h.service.ListUsers(c.Request().Context(), &form)
	if err != nil {
		return response.InternalServerError(c, "Failed to list users")
	}

	return response.Success(c, users, "Users retrieved successfully")
}

// GetUserByID gets a user by ID (admin only)
// @Summary Get user by ID
// @Description Get user details by ID (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path string true "User ID"
// @Success 200 {object} response.APIResponse{data=UserResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/{id} [get]
func (h *Handler) GetUserByID(c echo.Context) error {
	idStr := c.Param("id")
	userID, err := uuid.Parse(idStr)
	if err != nil {
		return response.BadRequest(c, "Invalid user ID", "")
	}

	user, err := h.service.GetUserByID(c.Request().Context(), userID)
	if err != nil {
		return response.NotFound(c, "User not found")
	}

	return response.Success(c, user.ToResponse(), "User retrieved successfully")
}

// UpdateUser updates a user (admin only)
// @Summary Update user
// @Description Update user information (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path string true "User ID"
// @Param user body UpdateUserForm true "User update data"
// @Success 200 {object} response.APIResponse{data=UserResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/{id} [put]
func (h *Handler) UpdateUser(c echo.Context) error {
	// TODO: Get current user ID from JWT token
	currentUserID := uuid.New() // Placeholder

	idStr := c.Param("id")
	userID, err := uuid.Parse(idStr)
	if err != nil {
		return response.BadRequest(c, "Invalid user ID", "")
	}

	var form UpdateUserForm
	if err := c.Bind(&form); err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	// Call service
	user, err := h.service.UpdateUser(c.Request().Context(), userID, &form, &currentUserID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, user.ToResponse(), "User updated successfully")
}

// DeleteUser deletes a user (admin only)
// @Summary Delete user
// @Description Delete a user (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path string true "User ID"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/{id} [delete]
func (h *Handler) DeleteUser(c echo.Context) error {
	// TODO: Get current user ID from JWT token
	currentUserID := uuid.New() // Placeholder

	idStr := c.Param("id")
	userID, err := uuid.Parse(idStr)
	if err != nil {
		return response.BadRequest(c, "Invalid user ID", "")
	}

	err = h.service.DeleteUser(c.Request().Context(), userID, &currentUserID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, map[string]interface{}{
		"message": "User deleted successfully",
	}, "User deleted successfully")
}

// UpdateUserStatus updates user status (admin only)
// @Summary Update user status
// @Description Update user account status (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path string true "User ID"
// @Param status body UpdateUserStatusForm true "Status update data"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/{id}/status [put]
func (h *Handler) UpdateUserStatus(c echo.Context) error {
	// TODO: Get current user ID from JWT token
	currentUserID := uuid.New() // Placeholder

	idStr := c.Param("id")
	userID, err := uuid.Parse(idStr)
	if err != nil {
		return response.BadRequest(c, "Invalid user ID", "")
	}

	var form UpdateUserStatusForm
	if err := c.Bind(&form); err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	// Call service
	err = h.service.UpdateUserStatus(c.Request().Context(), userID, &form, &currentUserID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, map[string]interface{}{
		"message": "User status updated successfully",
	}, "User status updated successfully")
}

// UpdateUserRole updates user role (admin only)
// @Summary Update user role
// @Description Update user role (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path string true "User ID"
// @Param role body UpdateUserRoleForm true "Role update data"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/{id}/role [put]
func (h *Handler) UpdateUserRole(c echo.Context) error {
	// TODO: Get current user ID from JWT token
	currentUserID := uuid.New() // Placeholder

	idStr := c.Param("id")
	userID, err := uuid.Parse(idStr)
	if err != nil {
		return response.BadRequest(c, "Invalid user ID", "")
	}

	var form UpdateUserRoleForm
	if err := c.Bind(&form); err != nil {
		return response.BadRequest(c, "Invalid request format", "")
	}

	// Validate form
	if _, err := govalidator.ValidateStruct(form); err != nil {
		return response.ValidationError(c, err.Error(), "")
	}

	// Call service
	err = h.service.UpdateUserRole(c.Request().Context(), userID, &form, &currentUserID)
	if err != nil {
		return response.BadRequest(c, err.Error(), "")
	}

	return response.Success(c, map[string]interface{}{
		"message": "User role updated successfully",
	}, "User role updated successfully")
}

// GetUsersByCompanyID gets users by company ID (admin only)
// @Summary Get users by company ID
// @Description Get users belonging to a specific company (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param company_id path string true "Company ID"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/company/{company_id} [get]
func (h *Handler) GetUsersByCompanyID(c echo.Context) error {
	companyIDStr := c.Param("company_id")
	companyID, err := uuid.Parse(companyIDStr)
	if err != nil {
		return response.BadRequest(c, "Invalid company ID", "")
	}

	// Get query parameters
	limitStr := c.QueryParam("limit")
	if limitStr == "" {
		limitStr = "20"
	}
	offsetStr := c.QueryParam("offset")
	if offsetStr == "" {
		offsetStr = "0"
	}

	limit, err := strconv.Atoi(limitStr)
	if err != nil {
		return response.BadRequest(c, "Invalid limit parameter", "")
	}

	offset, err := strconv.Atoi(offsetStr)
	if err != nil {
		return response.BadRequest(c, "Invalid offset parameter", "")
	}

	// Call service
	users, total, err := h.service.GetUsersByCompanyID(c.Request().Context(), companyID, limit, offset)
	if err != nil {
		return response.InternalServerError(c, "Failed to get users by company")
	}

	// Convert to responses
	var userResponses []*UserResponse
	for _, user := range users {
		userResponses = append(userResponses, user.ToResponse())
	}

	return response.SuccessWithMeta(c, map[string]interface{}{
		"users": userResponses,
	}, &response.Meta{
		Total:  int(total),
		Limit:  limit,
		Offset: offset,
	}, "Users retrieved successfully")
}

// GetUsersByRole gets users by role (admin only)
// @Summary Get users by role
// @Description Get users with a specific role (admin only)
// @Tags users
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param role path string true "User role"
// @Param limit query int false "Limit results"
// @Param offset query int false "Offset results"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 401 {object} response.APIResponse
// @Failure 403 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /users/admin/role/{role} [get]
func (h *Handler) GetUsersByRole(c echo.Context) error {
	roleStr := c.Param("role")
	role := UserRole(roleStr)

	// Validate role
	if !h.validator.IsValidRole(role) {
		return response.BadRequest(c, "Invalid role", "")
	}

	// Get query parameters
	limitStr := c.QueryParam("limit")
	if limitStr == "" {
		limitStr = "20"
	}
	offsetStr := c.QueryParam("offset")
	if offsetStr == "" {
		offsetStr = "0"
	}

	limit, err := strconv.Atoi(limitStr)
	if err != nil {
		return response.BadRequest(c, "Invalid limit parameter", "")
	}

	offset, err := strconv.Atoi(offsetStr)
	if err != nil {
		return response.BadRequest(c, "Invalid offset parameter", "")
	}

	// Call service
	users, err := h.service.GetUsersByRole(c.Request().Context(), role, limit, offset)
	if err != nil {
		return response.InternalServerError(c, "Failed to get users by role")
	}

	// Convert to responses
	var userResponses []*UserResponse
	for _, user := range users {
		userResponses = append(userResponses, user.ToResponse())
	}

	return response.SuccessWithMeta(c, map[string]interface{}{
		"users": userResponses,
		"role":  role,
	}, &response.Meta{
		Limit:  limit,
		Offset: offset,
	}, "Users retrieved successfully")
}

// AuthMiddleware and AdminMiddleware are now implemented in middleware.go