package models

import (
	"fmt"
	"time"

	"github.com/bluesky-social/indigo/atproto/syntax"
	"tangled.org/core/api/tangled"
)

type Follow struct {
	UserDid    string
	SubjectDid string
	FollowedAt time.Time
	Rkey       string
}

func (f *Follow) AsRecord() tangled.GraphFollow {
	return tangled.GraphFollow{
		Subject:   f.SubjectDid,
		CreatedAt: f.FollowedAt.Format(time.RFC3339),
	}
}

func FollowFromRecord(did syntax.DID, rkey syntax.RecordKey, record tangled.GraphFollow) (Follow, error) {
	subjectDid, err := syntax.ParseDID(record.Subject)
	if err != nil {
		return Follow{}, fmt.Errorf("subject should be valid did: %w", err)
	}

	created, err := time.Parse(time.RFC3339, record.CreatedAt)
	if err != nil {
		return Follow{}, fmt.Errorf("invalid time format '%s'", record.CreatedAt)
	}

	return Follow{
		UserDid:    did.String(),
		Rkey:       rkey.String(),
		SubjectDid: subjectDid.String(),
		FollowedAt: created,
	}, nil
}

type FollowStats struct {
	Followers int64
	Following int64
}

type FollowStatus int

const (
	IsNotFollowing FollowStatus = iota
	IsFollowing
	IsSelf
)

func (s FollowStatus) String() string {
	switch s {
	case IsNotFollowing:
		return "IsNotFollowing"
	case IsFollowing:
		return "IsFollowing"
	case IsSelf:
		return "IsSelf"
	default:
		return "IsNotFollowing"
	}
}