// inbox prints the logged-in user's new submissions the "what's new
// from people you watch" feed at https://www.furaffinity.net/msg/submissions/.
//
// Requires FA_A and FA_B (session cookies). CF_CLEARANCE + FA_UA are
// strongly recommended without them FurAffinity's Cloudflare layer will
// usually serve a challenge page instead of the inbox.
//
//	go run ./examples/inbox             # first page (~72 items)
//	go run ./examples/inbox 3           # up to 3 cursor pages (~216 items)
package main

import (
	"context"
	"errors"
	"fmt"
	"log"
	"os"
	"strconv"

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

func main() {
	maxPages := 1
	if len(os.Args) >= 2 {
		if n, err := strconv.Atoi(os.Args[1]); err == nil && n > 0 {
			maxPages = n
		}
	}

	a, b := os.Getenv("FA_A"), os.Getenv("FA_B")
	if a == "" || b == "" {
		log.Fatal("FA_A and FA_B must be set the submission inbox requires login")
	}
	//if os.Getenv("CF_CLEARANCE") == "" || os.Getenv("FA_UA") == "" {
	//	log.Println("warning: CF_CLEARANCE / FA_UA not set expect a Cloudflare challenge")
	//}

	client := fa.New(
		fa.WithCookies(fa.Cookies{A: a, B: b}),
		//fa.WithCloudflare(fa.CFCookies{Clearance: os.Getenv("CF_CLEARANCE")}),
		fa.WithUserAgent(envOr("FA_UA", "go-fa-api-example/0.1")),
		// JSON-first listing parse: more resilient to FA markup tweaks,
		// and populates each item's author avatar URL.
		fa.WithExperimentalJSONListings(false),
	)

	count := 0
	for sub, err := range client.SubmissionInbox(context.Background(), fa.ListOptions{MaxPages: maxPages}) {
		if err != nil {
			switch {
			case errors.Is(err, fa.ErrCloudflareChallenge):
				log.Fatal("Cloudflare challenge refresh CF_CLEARANCE + FA_UA from your browser and retry")
			case errors.Is(err, fa.ErrUnauthorized):
				log.Fatal("unauthorized FA_A / FA_B are missing or expired")
			default:
				log.Fatalf("SubmissionInbox: %v", err)
			}
		}
		count++
		when := "—"
		if !sub.PostedAt.IsZero() {
			when = sub.PostedAt.Format("2006-01-02 15:04")
		}
		fmt.Printf("[%d] %-50.50s %-8s by %s (%s)\n",
			sub.ID, sub.Title, sub.Rating, sub.Author.DisplayName, when)
	}
	fmt.Printf("\n%d new submission(s) across up to %d page(s)\n", count, maxPages)
}

func envOr(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}