package usage

import (
	"context"
	"strconv"
	"strings"

	"apps/backend/internal/middleware"
	"apps/backend/internal/module/permission"
	"apps/backend/internal/response"
	"apps/backend/internal/svc"
	"apps/backend/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type GetUsagePrefsLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetUsagePrefsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetUsagePrefsLogic {
	return &GetUsagePrefsLogic{Logger: logx.WithContext(ctx), ctx: ctx, svcCtx: svcCtx}
}

func (l *GetUsagePrefsLogic) GetUsagePrefs(req *types.UsagePrefsReq) (*types.UsagePrefsData, error) {
	if l.svcCtx.Usage == nil {
		return nil, response.Biz(503, 503001, "usage not configured")
	}
	uid, ok := middleware.UIDFrom(l.ctx)
	if !ok {
		return nil, response.Biz(401, 401001, "missing authorization")
	}
	// Reading somebody else's plan is admin-only; the admin console needs it to show the plan of
	// the member being edited rather than the admin's own.
	if target := strings.TrimSpace(req.Uid); target != "" {
		parsed, err := strconv.ParseInt(target, 10, 64)
		if err != nil {
			return nil, response.Biz(400, 400001, "invalid uid")
		}
		if parsed != uid {
			if !permission.IsAdmin(middleware.RolesFrom(l.ctx)) {
				return nil, response.Biz(403, 403002, "permission denied")
			}
			uid = parsed
		}
	}
	p, err := l.svcCtx.Usage.GetPrefs(l.ctx, uid)
	if err != nil {
		return nil, err
	}
	return &types.UsagePrefsData{PlanId: p.PlanID, Unlimited: p.Unlimited}, nil
}
