package importer

import (
	"context"
	"fmt"
	"os"
	"path"
	"testing"

	"github.com/ipfs/go-ipfs-cmdkit/files"
	ipld "github.com/ipfs/go-ipld-format"
)

const testDir = "testingData"

func getTestingDir() (files.File, error) {
	fpath := testDir
	stat, err := os.Lstat(fpath)
	if err != nil {
		return nil, err
	}

	if !stat.IsDir() {
		return nil, fmt.Errorf("testDir should be seen as directory")
	}

	return files.NewSerialFile(path.Base(fpath), fpath, false, stat)
}

// simply import and ensure no errors occur
func TestToPrint(t *testing.T) {
	file, err := getTestingDir()
	if err != nil {
		t.Fatal(err)
	}
	err = ToPrint(file)
	if err != nil {
		t.Fatal(err)
	}
}

var orderedCids = [18]string{"QmUNLLsPACCz1vLxQVkXqqLX5R1X345qqfHbsf67hvA3Nn",
	"Qmbp4C4KkyjVzTpZ327Ub555FEHizhJS4M17f2zCCrQMAz",
	"QmYz38urZ99eVCxSccM63bGtDv54UWtBDWJdTxGch23khA",
	"QmUwG2mfhhfBEzVtvyEvva1kc8kU4CrXphdMCdAiFNWdxy",
	"QmRgkP4x7tXW9PyiPPxe3aqALQEs22nifkwzrm7wickdfr",
	"QmNpCHs9zrzP4aArBzRQgjNSbMC5hYqJa1ksmbyorSu44b",
	"QmQbg4sHm4zVHnqCS14YzNnQFVMqjZpu5XjkF7vtbzqkFW",
	"QmcUBApwNSDg2Q2J4NXzks1HewVGFohNpPyEud7bZfo5tE",
	"QmaKaB735eydQwnaJNuYbXRU1gVb4MJdzHp1rpUZJN67G6",
	"QmQ6n82dRtEJVHMDLW5BSrJ6bRDXkFXj2i7Vjxy4B2PH82",
	"QmbDaWrwxk93RfWSBL8ajTproNKbE2EghBLSk8199EBm1m",
	"QmXDmRPxV9KWYLhN7bqGn143GgiNxhy9Hqc3ZPJW63xgok",
	"QmPZLJ3CZYgxH4K1w5jdbAdxJynXn5TCB4kHy7u8uHC3fy",
	"QmUqmcdJJodX7mPoUv9u71HoNAiegBCiCqdUZd5ZrCyLbs",
	"QmaytnNarHzDp1ipGyC7zd7Hw2AePmtSpLLaygQ2e9Yvqe",
	"QmZwab9h6ADw3tv8pzXVF2yndgJpTWKrrMjJQqRkgYmCRH",
	"QmaNfMZDZjfqjHrFCc6tZwmkqbXs1fnY9AXZ81WUztFeXm",
	"QmY4qt6WG12qYwWeeTNhggqaNMJWp2NouuTSf79ukoobw8"}

// import and receive all blocks
func TestToChannel(t *testing.T) {
	file, err := getTestingDir()
	if err != nil {
		t.Fatal(err)
	}

	outChan := make(chan *ipld.Node)
	go func() {
		i := 0
		for node := range outChan {
			cid := (*node).String()
			if cid != orderedCids[i] {
				t.Error("unexpected cid: %s instead of %s", cid, orderedCids[i])
			}
			i += 1
		}
	}()
	err = ToChannel(file, outChan, context.Background())
	if err != nil {
		t.Fatal(err)
	}
}