package depot

import (
	"bytes"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
)

func testGetenv(vals map[string]string) func(string) string {
	return func(k string) string { return vals[k] }
}

func TestRunUsage(t *testing.T) {
	t.Run("no args", func(t *testing.T) {
		var out, errb bytes.Buffer
		code := Run(nil, &out, &errb, testGetenv(nil))
		if code != 64 {
			t.Fatalf("expected 64, got %d (stderr=%s)", code, errb.String())
		}
	})

	t.Run("unknown subcommand", func(t *testing.T) {
		var out, errb bytes.Buffer
		code := Run([]string{"bogus"}, &out, &errb, testGetenv(nil))
		if code != 64 {
			t.Fatalf("expected 64, got %d (stderr=%s)", code, errb.String())
		}
	})

	t.Run("status --target local without DEPOT_DIR", func(t *testing.T) {
		dir := t.TempDir()
		writeManifest(t, dir, shaOf("blob-a"), 5)
		var out, errb bytes.Buffer
		code := Run([]string{"status", "--manifests", dir, "--target", "local"}, &out, &errb, testGetenv(nil))
		if code != 64 {
			t.Fatalf("expected 64, got %d (stderr=%s)", code, errb.String())
		}
		if !bytesContains(errb.String(), "DEPOT_DIR") {
			t.Fatalf("expected stderr to mention DEPOT_DIR, got %s", errb.String())
		}
	})

	t.Run("push --target cdn rejected", func(t *testing.T) {
		dir := t.TempDir()
		var out, errb bytes.Buffer
		code := Run([]string{"push", "--manifests", dir, "--source", dir, "--target", "cdn"}, &out, &errb, testGetenv(nil))
		if code != 64 {
			t.Fatalf("expected 64, got %d (stderr=%s)", code, errb.String())
		}
	})
}

func TestGetInvalidSHA(t *testing.T) {
	var out, errb bytes.Buffer
	dir := t.TempDir()
	code := Run([]string{"get", "not-a-sha", dir + "/dest", "--target", "local"}, &out, &errb, testGetenv(map[string]string{"DEPOT_DIR": dir}))
	if code != 64 {
		t.Fatalf("expected 64, got %d (stderr=%s)", code, errb.String())
	}
}

func TestNoKeyStatusBunnyFailsClosedNoStdin(t *testing.T) {
	dir := t.TempDir()
	writeManifest(t, dir, shaOf("blob-a"), 5)

	var out, errb bytes.Buffer
	code := Run([]string{"status", "--manifests", dir, "--target", "bunny"}, &out, &errb, testGetenv(nil))
	if code != 70 {
		t.Fatalf("expected 70, got %d (stdout=%s stderr=%s)", code, out.String(), errb.String())
	}
	if !bytesContains(errb.String(), "BUNNY_STORAGE_HOST") {
		t.Fatalf("expected stderr to mention BUNNY_STORAGE_HOST, got %s", errb.String())
	}
}

func TestStatusExitCodes(t *testing.T) {
	t.Run("drift", func(t *testing.T) {
		f := newFakeBunny()
		srv := httptest.NewServer(f.handler())
		defer srv.Close()

		sha := shaOf("missing-blob")
		dir := t.TempDir()
		writeManifest(t, dir, sha, 5)

		var out, errb bytes.Buffer
		code := Run([]string{"status", "--manifests", dir, "--target", "bunny"}, &out, &errb,
			testGetenv(map[string]string{
				"BUNNY_STORAGE_HOST":          hostPort(srv),
				"BUNNY_STORAGE_READ_PASSWORD": "readkey",
			}))
		if code != 1 {
			t.Fatalf("expected 1, got %d (stdout=%s stderr=%s)", code, out.String(), errb.String())
		}
		if !bytesContains(out.String(), "missing="+"1") {
			t.Fatalf("expected missing=1 in output, got %s", out.String())
		}
		if !bytesContains(out.String(), "missing "+sha) {
			t.Fatalf("expected missing line for sha, got %s", out.String())
		}
	})

	t.Run("unconfirmed-only", func(t *testing.T) {
		stubProbeSleep(t)
		f := newFakeBunny()
		sha := shaOf("flaky-blob")
		f.statusFor[sha] = 428
		srv := httptest.NewServer(f.handler())
		defer srv.Close()

		dir := t.TempDir()
		writeManifest(t, dir, sha, 5)

		var out, errb bytes.Buffer
		code := Run([]string{"status", "--manifests", dir, "--target", "bunny"}, &out, &errb,
			testGetenv(map[string]string{
				"BUNNY_STORAGE_HOST":          hostPort(srv),
				"BUNNY_STORAGE_READ_PASSWORD": "readkey",
				"DEPOT_CONFIRM_RETRIES":       "1",
			}))
		if code != 2 {
			t.Fatalf("expected 2, got %d (stdout=%s stderr=%s)", code, out.String(), errb.String())
		}
		if !bytesContains(out.String(), "unconfirmed="+"1") {
			t.Fatalf("expected unconfirmed=1 in output, got %s", out.String())
		}
	})
}

func TestPushTransportErrorCountsFailed(t *testing.T) {
	// Probes 404 (blob absent), PUTs 500 (transport-level upload failure).
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method == http.MethodPut {
			w.WriteHeader(500)
			return
		}
		w.WriteHeader(404)
	}))
	defer srv.Close()

	sha := shaOf("push-fail-blob")
	manifestsDir := t.TempDir()
	writeManifest(t, manifestsDir, sha, 14)
	sourceDir := t.TempDir()
	blobPath := filepath.Join(sourceDir, BlobKey(sha))
	if err := os.MkdirAll(filepath.Dir(blobPath), 0755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(blobPath, []byte("push-fail-blob"), 0644); err != nil {
		t.Fatal(err)
	}

	var out, errb bytes.Buffer
	code := Run([]string{"push", "--manifests", manifestsDir, "--source", sourceDir, "--target", "bunny"}, &out, &errb,
		testGetenv(map[string]string{
			"BUNNY_STORAGE_HOST":     hostPort(srv),
			"BUNNY_STORAGE_PASSWORD": "writekey",
		}))
	if code != 70 {
		t.Fatalf("expected 70, got %d (stdout=%s stderr=%s)", code, out.String(), errb.String())
	}
	if !bytesContains(out.String(), "uploaded=0 failed=1") {
		t.Fatalf("expected uploaded=0 failed=1, got %s", out.String())
	}
}

func bytesContains(s, substr string) bool {
	return bytes.Contains([]byte(s), []byte(substr))
}

func writeManifest(t *testing.T, dir, sha string, size int64) {
	t.Helper()
	content := fmt.Sprintf("assets:\n  - path: foo\n    sha256: %s\n    size: %d\n", sha, size)
	if err := os.WriteFile(filepath.Join(dir, "manifest.yml"), []byte(content), 0644); err != nil {
		t.Fatal(err)
	}
}