package handler

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"github.com/user-management-system/internal/domain"
	"github.com/user-management-system/internal/service"
)

// RoleHandler handles role management requests
type RoleHandler struct {
	roleService *service.RoleService
}

// NewRoleHandler creates a new RoleHandler
func NewRoleHandler(roleService *service.RoleService) *RoleHandler {
	return &RoleHandler{roleService: roleService}
}

func (h *RoleHandler) CreateRole(c *gin.Context) {
	var req service.CreateRoleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	role, err := h.roleService.CreateRole(c.Request.Context(), &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusCreated, role)
}

func (h *RoleHandler) ListRoles(c *gin.Context) {
	var req service.ListRoleRequest
	if err := c.ShouldBindQuery(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	roles, total, err := h.roleService.ListRoles(c.Request.Context(), &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"roles": roles,
		"total": total,
	})
}

func (h *RoleHandler) GetRole(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	role, err := h.roleService.GetRole(c.Request.Context(), id)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, role)
}

func (h *RoleHandler) UpdateRole(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	var req service.UpdateRoleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	role, err := h.roleService.UpdateRole(c.Request.Context(), id, &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, role)
}

func (h *RoleHandler) DeleteRole(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	if err := h.roleService.DeleteRole(c.Request.Context(), id); err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "role deleted"})
}

func (h *RoleHandler) UpdateRoleStatus(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	var req struct {
		Status string `json:"status" binding:"required"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	var status domain.RoleStatus
	switch req.Status {
	case "enabled", "1":
		status = domain.RoleStatusEnabled
	case "disabled", "0":
		status = domain.RoleStatusDisabled
	default:
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid status"})
		return
	}

	err = h.roleService.UpdateRoleStatus(c.Request.Context(), id, status)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "status updated"})
}

func (h *RoleHandler) GetRolePermissions(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	perms, err := h.roleService.GetRolePermissions(c.Request.Context(), id)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{"permissions": perms})
}

func (h *RoleHandler) AssignPermissions(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid role id"})
		return
	}

	var req struct {
		PermissionIDs []int64 `json:"permission_ids"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	err = h.roleService.AssignPermissions(c.Request.Context(), id, req.PermissionIDs)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "permissions assigned"})
}