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"
)

// PermissionHandler handles permission management requests
type PermissionHandler struct {
	permissionService *service.PermissionService
}

// NewPermissionHandler creates a new PermissionHandler
func NewPermissionHandler(permissionService *service.PermissionService) *PermissionHandler {
	return &PermissionHandler{permissionService: permissionService}
}

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

	perm, err := h.permissionService.CreatePermission(c.Request.Context(), &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusCreated, perm)
}

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

	perms, total, err := h.permissionService.ListPermissions(c.Request.Context(), &req)
	if err != nil {
		handleError(c, err)
		return
	}

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

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

	perm, err := h.permissionService.GetPermission(c.Request.Context(), id)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, perm)
}

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

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

	perm, err := h.permissionService.UpdatePermission(c.Request.Context(), id, &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, perm)
}

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

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

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

func (h *PermissionHandler) UpdatePermissionStatus(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid permission 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.PermissionStatus
	switch req.Status {
	case "enabled", "1":
		status = domain.PermissionStatusEnabled
	case "disabled", "0":
		status = domain.PermissionStatusDisabled
	default:
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid status"})
		return
	}

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

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

func (h *PermissionHandler) GetPermissionTree(c *gin.Context) {
	tree, err := h.permissionService.GetPermissionTree(c.Request.Context())
	if err != nil {
		handleError(c, err)
		return
	}

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