package workspaceops

import (
	"context"
	"encoding/json"
	"io"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"

	"github.com/aritmolab/thothii/tools/tht/internal/compose"
	"github.com/aritmolab/thothii/tools/tht/internal/config"
)

type fakeRunner struct {
	run    func(args []string, stdin string) (compose.Result, error)
	all    [][]string
	stdins []string
}

func (r *fakeRunner) Run(_ context.Context, args []string, stdin io.Reader) (compose.Result, error) {
	payload := ""
	if stdin != nil {
		contents, err := io.ReadAll(stdin)
		if err != nil {
			return compose.Result{}, err
		}
		payload = string(contents)
	}
	r.all = append(r.all, append([]string(nil), args...))
	r.stdins = append(r.stdins, payload)
	return r.run(args, payload)
}

func TestExecuteRunSendsOnlyTheOneShotEnvelope(t *testing.T) {
	installation := testInstallation(t)
	runner := &fakeRunner{run: func(args []string, stdin string) (compose.Result, error) {
		switch {
		case contains(args, "config", "--format", "json"):
			return compose.Result{Stdout: `{"services":{"core":{"image":"thothii-core:local"}}}`}, nil
		case reflect.DeepEqual(args, []string{"image", "inspect", "--format", "{{.Id}}", "thothii-core:local"}):
			return compose.Result{Stdout: "sha256:" + strings.Repeat("a", 64)}, nil
		case contains(args, "workspace-maintenance", "preprocess-run"):
			var envelope map[string]any
			if err := json.Unmarshal([]byte(stdin), &envelope); err != nil {
				t.Fatalf("stdin JSON = %q, err=%v", stdin, err)
			}
			if !reflect.DeepEqual(envelope, map[string]any{
				"schemaVersion": float64(1),
				"workspaceId":   "abc",
			}) {
				t.Fatalf("unexpected envelope: %#v", envelope)
			}
			return compose.Result{Stdout: successResult("preprocess run")}, nil
		default:
			t.Fatalf("unexpected Docker invocation: %#v", args)
			return compose.Result{}, nil
		}
	}}

	result, err := Execute(
		context.Background(),
		installation,
		runner,
		RunRequest{baseRequest: baseRequest{Workspace: "abc", JSON: true}},
	)
	if err != nil {
		t.Fatalf("Execute() error = %v", err)
	}
	if result.Status != "succeeded" || result.Operation != "preprocess run" {
		t.Fatalf("unexpected result: %#v", result)
	}
}

func TestParseAcceptsOnlyInspectAndCompletePreprocessing(t *testing.T) {
	for _, args := range [][]string{
		{"inspect", "--workspace", "abc", "--json"},
		{"preprocess", "run", "--workspace", "abc", "--json"},
		{"preprocess", "clear", "--workspace", "abc", "--json"},
	} {
		if _, err := Parse(args); err != nil {
			t.Fatalf("Parse(%v) error = %v", args, err)
		}
	}

	retired := [][]string{
		{"preprocess", "dwh", "--workspace", "abc"},
		{"preprocess", "evidence", "--workspace", "abc"},
		{"preprocess", "run", "--workspace", "abc", "--resume", strings.Repeat("a", 32)},
		{"preprocess", "run", "--workspace", "abc", "--dry-run"},
		{"schema", "suggest-fks", "--workspace", "abc"},
		{"schema", "check", "--workspace", "abc"},
		{"schema", "accept", "--workspace", "abc"},
		{"index-schema", "--workspace", "abc"},
		{"vector", "inspect", "--workspace", "abc"},
		{"vector", "rebuild", "--workspace", "abc"},
	}
	for _, args := range retired {
		if _, err := Parse(args); err == nil {
			t.Fatalf("retired command accepted: %v", args)
		}
	}
}

func testInstallation(t *testing.T) config.Installation {
	t.Helper()
	temporaryRoot, err := filepath.EvalSymlinks(os.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	root, err := os.MkdirTemp(temporaryRoot, "tht-workspaceops-")
	if err != nil {
		t.Fatal(err)
	}
	t.Cleanup(func() { _ = os.RemoveAll(root) })
	project := filepath.Join(root, "project")
	if err := os.MkdirAll(filepath.Join(project, "deploy"), 0o700); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(project, "compose.yaml"), []byte("services: {}\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(project, "deploy", "compose.local.yaml"), []byte("services: {}\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	envFile := filepath.Join(root, "installation.env")
	if err := os.WriteFile(envFile, []byte("SAFE_VALUE=1\n"), 0o600); err != nil {
		t.Fatal(err)
	}
	return config.Installation{
		Path: filepath.Join(root, "thothii-installation.yaml"), Profile: "local",
		ProjectDirectory: project, EnvFile: envFile,
	}
}

func contains(values []string, sequence ...string) bool {
	for start := range values {
		if start+len(sequence) <= len(values) && reflect.DeepEqual(values[start:start+len(sequence)], sequence) {
			return true
		}
	}
	return false
}

func successResult(operation string) string {
	return `{"schemaVersion":1,"status":"succeeded","code":"ok","workspaceId":"abc","workspaceRevision":"1234567890abcdef1234567890abcdef12345678","descriptorBlob":"sha256:` + strings.Repeat("f", 64) + `","operation":"` + operation + `","completedStages":[]}`
}