// download fetches a single submission and streams its main file to disk.
// Demonstrates that downloads share the SDK's rate limiter and cookie jar
// with metadata fetches.
//
//	go run ./examples/download 12345678 out.jpg
package main

import (
	"context"
	"log"
	"os"
	"strconv"

	fa "git.anthrove.art/public/go-fa-api"
)

func main() {
	if len(os.Args) < 3 {
		log.Fatalf("usage: %s <submission-id> <out-path>", os.Args[0])
	}
	id, err := strconv.ParseInt(os.Args[1], 10, 64)
	if err != nil {
		log.Fatalf("invalid id: %v", err)
	}

	client := fa.New(
		fa.WithCookies(fa.Cookies{A: os.Getenv("FA_A"), B: os.Getenv("FA_B")}),
		fa.WithCloudflare(fa.CFCookies{Clearance: os.Getenv("CF_CLEARANCE")}),
		fa.WithUserAgent(os.Getenv("FA_UA")),
	)

	ctx := context.Background()
	sub, err := client.GetSubmission(ctx, fa.SubmissionID(id))
	if err != nil {
		log.Fatalf("GetSubmission: %v", err)
	}

	out, err := os.Create(os.Args[2])
	if err != nil {
		log.Fatalf("create: %v", err)
	}
	defer out.Close()

	n, err := client.Download(ctx, sub, out)
	if err != nil {
		log.Fatalf("download: %v", err)
	}
	log.Printf("wrote %d bytes to %s", n, os.Args[2])
}