package controllers

import (
	"github.com/gofiber/fiber/v3"

	"server/internal/models"
)

type AdminController struct{}

func NewAdminController() *AdminController {
	return &AdminController{}
}

// Typescript: interface
type ListUsersRequest struct {
	Page     int `json:"page" validate:"omitempty,min=1"`
	PageSize int `json:"pageSize" validate:"omitempty,min=1,max=100"`
}

// ListUsers returns a paginated list of users (requires admin permissions).
func (ac *AdminController) ListUsers(c fiber.Ctx) error {
	var req ListUsersRequest
	if err := c.Bind().Body(&req); err != nil {
		return fiber.NewError(fiber.StatusBadRequest, "invalid payload")
	}
	if err := validateStruct(&req); err != nil {
		return err
	}
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 || req.PageSize > 100 {
		req.PageSize = 20
	}

	db, err := dbFromCtx(c)
	if err != nil {
		return err
	}

	var list []models.User
	offset := (req.Page - 1) * req.PageSize
	if err := db.Preload("Details").Preload("Preferences").
		Limit(req.PageSize).
		Offset(offset).
		Find(&list).Error; err != nil {
		return fiber.NewError(fiber.StatusInternalServerError, "failed to load users")
	}

	// Map to short representation
	short := make([]models.UserShort, 0, len(list))
	for i := range list {
		short = append(short, models.ToUserShort(&list[i]))
	}

	return c.JSON(fiber.Map{
		"data": fiber.Map{
			"page":     req.Page,
			"pageSize": req.PageSize,
			"items":    short,
		},
		"error": nil,
	})
}