package usecase

import (
	"context"

	"github.com/TelegramExchange/tgex-parser/internal/domain"
)

type Telegram interface {
	ParseChannelMeta(ctx context.Context, username string) (domain.Channel, error)
	GetChannelHistory(ctx context.Context, channel domain.Channel, limit int) ([]domain.Post, error)
	GetChannelDiff(ctx context.Context, channel domain.Channel, limit int) (domain.ChannelDiff, error)
	UpdatePostsViews(ctx context.Context, channel domain.Channel, posts []domain.Post) error
}

type Database interface {
	CreatePost(ctx context.Context, post domain.Post) error

	CreateViewsSnapshot(ctx context.Context, snapshot domain.ViewsSnapshot) error

	GetChannels(ctx context.Context) []domain.Channel
	UpdateChannel(ctx context.Context, channel domain.Channel) error
	GetChannelsWithTrackedPosts(ctx context.Context) ([]domain.Channel, error)
	GetTrackedPosts(ctx context.Context, channel domain.Channel) ([]domain.Post, error)
	DeletePost(ctx context.Context, p domain.Post) error
}

type UseCase struct {
	telegram Telegram
	database Database
}

func New(telegram Telegram, database Database) *UseCase {
	return &UseCase{
		telegram: telegram,
		database: database,
	}
}