package feeds

import (
	"errors"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/google/uuid"
)

func TestResolveCompanyPath(t *testing.T) {
	t.Parallel()
	base := t.TempDir()
	cid := uuid.New()
	rel := cid.String() + "/sample.csv"
	absWant := filepath.Join(base, filepath.FromSlash(rel))
	if err := os.MkdirAll(filepath.Dir(absWant), 0o750); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(absWant, []byte("a,b\n1,2\n"), 0o640); err != nil {
		t.Fatal(err)
	}

	got, err := resolveCompanyPath(base, cid, rel)
	if err != nil {
		t.Fatalf("resolve: %v", err)
	}
	if filepath.Clean(got) != filepath.Clean(absWant) {
		t.Fatalf("got %q want %q", got, absWant)
	}

	if _, err := resolveCompanyPath(base, cid, "../etc/passwd"); err == nil {
		t.Fatal("expected traversal reject")
	}
	other := uuid.New()
	if _, err := resolveCompanyPath(base, cid, other.String()+"/x.csv"); err == nil {
		t.Fatal("expected company mismatch reject")
	}
}

func TestReadLocalFeed(t *testing.T) {
	t.Parallel()
	base := t.TempDir()
	cid := uuid.New()
	rel := cid.String() + "/products.csv"
	abs := filepath.Join(base, filepath.FromSlash(rel))
	if err := os.MkdirAll(filepath.Dir(abs), 0o750); err != nil {
		t.Fatal(err)
	}
	payload := []byte("ean,title\n123,Widget\n")
	if err := os.WriteFile(abs, payload, 0o640); err != nil {
		t.Fatal(err)
	}

	svc := &Service{UploadDir: base}
	blob, err := svc.readLocalFeed(cid, rel)
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = blob.Close() })
	if blob.contentType != "text/csv" {
		t.Fatalf("content-type %q", blob.contentType)
	}
	data, err := os.ReadFile(blob.path)
	if err != nil {
		t.Fatal(err)
	}
	if string(data) != string(payload) {
		t.Fatalf("payload mismatch")
	}
	if blob.owned {
		t.Fatal("local feed must not own path")
	}
}

func TestReadLocalFeedRejectsOversized(t *testing.T) {
	t.Parallel()
	old := maxDownloadBytes
	maxDownloadBytes = 32
	t.Cleanup(func() { maxDownloadBytes = old })

	base := t.TempDir()
	cid := uuid.New()
	rel := cid.String() + "/big.csv"
	abs := filepath.Join(base, filepath.FromSlash(rel))
	if err := os.MkdirAll(filepath.Dir(abs), 0o750); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(abs, []byte(strings.Repeat("x", 40)), 0o640); err != nil {
		t.Fatal(err)
	}
	svc := &Service{UploadDir: base}
	_, err := svc.readLocalFeed(cid, rel)
	if !errors.Is(err, errDownloadTooLarge) {
		t.Fatalf("err=%v want errDownloadTooLarge", err)
	}
}

func TestSourcePathFromOptions(t *testing.T) {
	t.Parallel()
	if p := sourcePathFromOptions(map[string]any{"source_path": " a/b.csv "}); p != "a/b.csv" {
		t.Fatalf("got %q", p)
	}
	if p := sourcePathFromOptions(nil); p != "" {
		t.Fatalf("got %q", p)
	}
}