package releasekit_test

import (
	"context"
	"errors"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"testing"
	"time"

	releasekit "go.maximumdirect.net/releasekit"
)

// inspectionDeadlineContext models deadline expiration at the readiness signal,
// so unrelated setup time cannot consume the source-inspection test's deadline.
type inspectionDeadlineContext struct{ context.Context }

func (ctx inspectionDeadlineContext) Err() error {
	return context.Cause(ctx.Context)
}

func TestBuildSourceInspectionCancellation(t *testing.T) {
	const source = `package main
import("fmt";"os";"go.maximumdirect.net/releasekit/buildinfo")
func main(){ if len(os.Args)>1 && os.Args[1]=="version" {fmt.Println("fixture",buildinfo.Version())} }
`
	for _, tc := range []struct {
		name     string
		status   int
		deadline bool
		binary   bool
	}{
		{"initial", 1, false, false}, {"deadline", 1, true, false}, {"final", 2, false, true},
	} {
		t.Run(tc.name, func(t *testing.T) {
			repo := newBuildConsumer(t, source)
			realGit, err := exec.LookPath("git")
			if err != nil {
				t.Fatal(err)
			}
			bin := t.TempDir()
			count := filepath.Join(t.TempDir(), "count")
			ready := filepath.Join(t.TempDir(), "ready")
			script := `#!/bin/sh
for arg in "$@"; do
 if [ "$arg" = status ]; then
  count=0
  if [ -f "$INSPECT_COUNT" ]; then count=$(/bin/cat "$INSPECT_COUNT"); fi
  count=$((count+1)); printf '%s' "$count" > "$INSPECT_COUNT"
  if [ "$count" = "$INSPECT_BLOCK" ]; then : > "$INSPECT_READY"; exec /bin/sleep 60; fi
 fi
done
exec "$INSPECT_GIT" "$@"
`
			if err := os.WriteFile(filepath.Join(bin, "git"), []byte(script), 0755); err != nil {
				t.Fatal(err)
			}
			t.Setenv("PATH", bin+string(os.PathListSeparator)+os.Getenv("PATH"))
			t.Setenv("INSPECT_GIT", realGit)
			t.Setenv("INSPECT_COUNT", count)
			t.Setenv("INSPECT_READY", ready)
			t.Setenv("INSPECT_BLOCK", fmt.Sprint(tc.status))
			var ctx context.Context
			var cancel context.CancelFunc
			if tc.deadline {
				parent, expire := context.WithCancelCause(context.Background())
				ctx = inspectionDeadlineContext{parent}
				cancel = func() { expire(context.DeadlineExceeded) }
			} else {
				ctx, cancel = context.WithCancel(context.Background())
			}
			defer cancel()
			request := releasekit.BuildRequest{RepositoryDir: repo, Version: "v1.2.3", OutputDir: t.TempDir()}
			if tc.binary {
				request.Spec = releasekit.BuildSpec{MainPackage: "./cmd/app", BinaryName: "fixture", Targets: []releasekit.Target{{OS: runtime.GOOS, Arch: runtime.GOARCH}}}
			}
			type outcome struct {
				result releasekit.BuildResult
				err    error
			}
			done := make(chan outcome, 1)
			go func() { result, err := releasekit.Build(ctx, request); done <- outcome{result, err} }()
			timer := time.NewTimer(45 * time.Second)
			defer timer.Stop()
			ticker := time.NewTicker(10 * time.Millisecond)
			defer ticker.Stop()
			waiting := true
			for waiting {
				if _, err := os.Stat(ready); err == nil {
					waiting = false
					break
				}
				select {
				case result := <-done:
					t.Fatalf("build ended before inspection: %#v, %v", result.result, result.err)
				case <-timer.C:
					cancel()
					result := <-done
					t.Fatalf("inspection did not start: %#v, %v", result.result, result.err)
				case <-ticker.C:
				}
			}
			cancel()
			var result outcome
			select {
			case result = <-done:
			case <-timer.C:
				t.Fatal("build did not stop after source inspection interruption")
			}
			want := context.Canceled
			if tc.deadline {
				want = context.DeadlineExceeded
			}
			if !errors.Is(result.err, want) || result.result.SourceVerified {
				t.Fatalf("result = %#v, error = %v", result.result, result.err)
			}
			if tc.binary {
				if len(result.result.Artifacts) != 1 || result.result.Artifacts[0].SHA256 == "" {
					t.Fatalf("completed artifact missing: %#v", result.result.Artifacts)
				}
				if _, err := os.Stat(result.result.Artifacts[0].Path); err != nil {
					t.Fatal(err)
				}
			}
		})
	}
}

func TestBuildSourceInspectionPreservesGitFailure(t *testing.T) {
	repo := newBuildConsumer(t, "package main\nfunc main() {}\n")
	realGit, err := exec.LookPath("git")
	if err != nil {
		t.Fatal(err)
	}
	bin := t.TempDir()
	script := "#!/bin/sh\nfor arg do if [ \"$arg\" = status ]; then exit 37; fi; done\nexec \"$INSPECT_GIT\" \"$@\"\n"
	if err := os.WriteFile(filepath.Join(bin, "git"), []byte(script), 0o755); err != nil {
		t.Fatal(err)
	}
	t.Setenv("PATH", bin+string(os.PathListSeparator)+os.Getenv("PATH"))
	t.Setenv("INSPECT_GIT", realGit)
	result, err := releasekit.Build(context.Background(), releasekit.BuildRequest{RepositoryDir: repo, Version: "v1.2.3"})
	var exitErr *exec.ExitError
	if !errors.As(err, &exitErr) || exitErr.ExitCode() != 37 || result.SourceVerified {
		t.Fatalf("result = %#v, error = %v", result, err)
	}
}