package user

import (
	"net/http"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"

	"furtuna-be/internal/common/errors"
	"furtuna-be/internal/entity"
	"furtuna-be/internal/handlers/request"
	"furtuna-be/internal/handlers/response"
	"furtuna-be/internal/services"
)

type Handler struct {
	service services.User
}

func (h *Handler) Route(group *gin.RouterGroup, jwt gin.HandlerFunc) {
	route := group.Group("/user")

	route.POST("/", jwt, h.Create)
	route.GET("/list", jwt, h.GetAll)
	route.GET("/:id", jwt, h.GetByID)
	route.PUT("/:id", jwt, h.Update)
	route.DELETE("/:id", jwt, h.Delete)
}

func NewHandler(service services.User) *Handler {
	return &Handler{
		service: service,
	}
}

// Create handles the creation of a new user.
// @Summary Create a new user
// @Description Create a new user based on the provided data.
// @Accept json
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param req body request.User true "New user details"
// @Success 200 {object} response.BaseResponse{data=response.User} "User created successfully"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Router /api/v1/user [post]
// @Tags User APIs
func (h *Handler) Create(c *gin.Context) {
	ctx := request.GetMyContext(c)

	var req request.User
	if err := c.ShouldBindJSON(&req); err != nil {
		response.ErrorWrapper(c, errors.ErrorBadRequest)
		return
	}

	if err := req.Validate(); err != nil {
		response.ErrorWrapper(c, errors.ErrorInvalidRequest)
		return
	}

	res, err := h.service.Create(ctx, req.ToEntity())

	if err != nil {
		response.ErrorWrapper(c, err)
		return
	}

	resp := response.User{
		ID:        res.ID,
		Name:      res.Name,
		Email:     res.Email,
		RoleID:    int64(res.RoleID),
		PartnerID: res.PartnerID,
		Status:    string(res.Status),
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Success: true,
		Status:  http.StatusOK,
		Data:    resp,
	})
}

// Update handles the update of an existing user.
// @Summary Update an existing user
// @Description Update the details of an existing user based on the provided ID.
// @Accept json
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param id path int64 true "User ID to update"
// @Param req body request.User true "Updated user details"
// @Success 200 {object} response.BaseResponse{data=response.User} "User updated successfully"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Router /api/v1/user/{id} [put]
// @Tags User APIs
func (h *Handler) Update(c *gin.Context) {
	ctx := request.GetMyContext(c)

	if !ctx.IsSuperAdmin() {
		response.ErrorWrapper(c, errors.ErrorUnauthorized)
		return
	}

	id := c.Param("id")

	userID, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		response.ErrorWrapper(c, errors.ErrorBadRequest)
		return
	}

	var req request.User
	if err := c.ShouldBindJSON(&req); err != nil {
		response.ErrorWrapper(c, errors.ErrorBadRequest)
		return
	}

	validate := validator.New()
	if err := validate.Struct(req); err != nil {
		response.ErrorWrapper(c, err)
		return
	}

	updatedUser, err := h.service.Update(ctx, userID, req.ToEntity())
	if err != nil {
		response.ErrorWrapper(c, err)
		return
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Success: true,
		Status:  http.StatusOK,
		Data:    h.toUserResponse(updatedUser),
	})
}

// GetAll retrieves a list of users.
// @Summary Get a list of users
// @Description Get a paginated list of users based on query parameters.
// @Accept json
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param Limit query int false "Number of items to retrieve (default 10)"
// @Param Offset query int false "Offset for pagination (default 0)"
// @Success 200 {object} response.BaseResponse{data=response.UserList} "List of users"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Router /api/v1/user/list [get]
// @Tags User APIs
func (h *Handler) GetAll(c *gin.Context) {
	ctx := request.GetMyContext(c)
	var req request.UserParam
	if err := c.ShouldBindQuery(&req); err != nil {

	}

	if !ctx.IsSuperAdmin() {
		response.ErrorWrapper(c, errors.ErrorUnauthorized)
		return
	}

	users, total, err := h.service.GetAll(ctx, req.ToEntity())
	if err != nil {
		response.ErrorWrapper(c, err)
		return
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Success: true,
		Status:  http.StatusOK,
		Data:    h.toUserResponseList(users, int64(total), req),
	})
}

// GetByID retrieves details of a specific user by ID.
// @Summary Get details of a user by ID
// @Description Get details of a user based on the provided ID.
// @Accept json
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param id path int64 true "User ID to retrieve"
// @Success 200 {object} response.BaseResponse{data=response.User} "User details"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Router /api/v1/user/{id} [get]
// @Tags User APIs
func (h *Handler) GetByID(c *gin.Context) {
	ctx := request.GetMyContext(c)
	id := c.Param("id")

	// Parse the ID into a uint
	userID, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		response.ErrorWrapper(c, errors.ErrorBadRequest)
		return
	}

	res, err := h.service.GetByID(ctx, userID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, response.BaseResponse{
			Success: false,
			Status:  http.StatusInternalServerError,
			Message: err.Error(),
			Data:    nil,
		})
		return
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Success: true,
		Status:  http.StatusOK,
		Data:    h.toUserResponse(res),
	})
}

// Delete handles the deletion of a user by ID.
// @Summary Delete a user by ID
// @Description Delete a user based on the provided ID.
// @Accept json
// @Produce json
// @Param Authorization header string true "JWT token"
// @Param id path int64 true "User ID to delete"
// @Success 200 {object} response.BaseResponse "User deleted successfully"
// @Failure 400 {object} response.BaseResponse{data=errors.Error} "Bad request"
// @Failure 401 {object} response.BaseResponse{data=errors.Error} "Unauthorized"
// @Router /api/v1/user/{id} [delete]
// @Tags User APIs
func (h *Handler) Delete(c *gin.Context) {
	ctx := request.GetMyContext(c)
	id := c.Param("id")

	// Parse the ID into a uint
	userID, err := strconv.ParseInt(id, 10, 64)
	if err != nil {
		response.ErrorWrapper(c, errors.ErrorBadRequest)
		return
	}

	err = h.service.Delete(ctx, userID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, response.BaseResponse{
			Success: false,
			Status:  http.StatusInternalServerError,
			Message: err.Error(),
			Data:    nil,
		})
		return
	}

	c.JSON(http.StatusOK, response.BaseResponse{
		Success: true,
		Status:  http.StatusOK,
		Data:    nil,
	})
}

func (h *Handler) toUserResponse(resp *entity.User) response.User {
	return response.User{
		ID:         resp.ID,
		Name:       resp.Name,
		Email:      resp.Email,
		Status:     string(resp.Status),
		RoleID:     int64(resp.RoleID),
		RoleName:   resp.RoleName,
		PartnerID:  resp.PartnerID,
		BranchName: resp.BranchName,
		CreatedAt:  resp.CreatedAt.Format(time.RFC3339),
		UpdatedAt:  resp.CreatedAt.Format(time.RFC3339),
	}
}

func (h *Handler) toUserResponseList(resp []*entity.User, total int64, req request.UserParam) response.UserList {
	var users []response.User
	for _, b := range resp {
		users = append(users, h.toUserResponse(b))
	}

	return response.UserList{
		Users:  users,
		Total:  total,
		Limit:  req.Limit,
		Offset: req.Offset,
	}
}