package commandkit

import (
	"bytes"
	"context"
	"io"
	"reflect"
	"strings"
	"testing"

	internalcobra "gitea.maximumdirect.net/eric/CommandKit/internal/cobra"
)

func TestAppParseUsesRegisteredBindingsWithTheAdapter(t *testing.T) {
	type input struct {
		scope Supplied[string]
		id    Supplied[string]
	}
	show := NewCommand(CommandSpec[input]{
		Name: "show",
		Flags: []Flag[input]{ValueFlag(FlagMeta{Name: "scope"}, (*string)(nil), func(value string) (string, error) {
			return value, nil
		}, func(value *input, supplied Supplied[string]) { value.scope = supplied })},
		Arguments: []Argument[input]{ValueArgument(ArgumentMeta{Name: "id"}, true, func(value string) (string, error) {
			return value, nil
		}, func(value *input, supplied Supplied[string]) { value.id = supplied })},
		Run: func(Invocation, input) Outcome { return Success() },
	})
	config := Group("config", "configuration", show)
	var err error
	app, err := New(Identity{Name: "example"}, config)
	if err != nil {
		t.Fatal(err)
	}

	options := internalcobra.ParseOptions{Context: context.Background()}
	result := app.parse([]string{"config", "show", "one", "--scope", "app"}, options)
	if result.Failure != nil {
		t.Fatalf("parse failed: %s", result.Failure.Message)
	}
	if !reflect.DeepEqual(result.Path, []string{"config", "show"}) || !reflect.DeepEqual(result.FlagValues, [][]string{{"app"}}) || !reflect.DeepEqual(result.Operands, []string{"one"}) {
		t.Fatalf("parse result = %#v", result)
	}
	result = app.parse([]string{"config", "--scope", "app", "show"}, options)
	if result.Failure == nil {
		t.Fatal("accepted a child flag before the complete command path")
	}
}

func TestExecutionRefreshesHelpMetadataAfterRegistration(t *testing.T) {
	first := NewCommand(CommandSpec[struct{}]{
		Name: "first",
		Run:  func(Invocation, struct{}) Outcome { return Success() },
	})
	app, err := New(Identity{Name: "example"}, first)
	if err != nil {
		t.Fatal(err)
	}
	var output bytes.Buffer
	current := newExecution(app, context.Background(), Streams{Out: &output, Err: io.Discard})
	parsed := current.parse([]string{"first"})
	if parsed.Failure != nil {
		t.Fatalf("initial parse failed: %s", parsed.Failure.Message)
	}

	late := NewCommand(CommandSpec[struct{}]{
		Name:    "late",
		Summary: "registered during execution",
		Run:     func(Invocation, struct{}) Outcome { return Success() },
	})
	if err := app.Register(late); err != nil {
		t.Fatal(err)
	}

	if got := current.renderHelp([]string{"late"}); got.Kind != OutcomeSuccess {
		t.Fatalf("help after registration = %#v", got)
	}
	if !strings.Contains(output.String(), "registered during execution") {
		t.Fatalf("help did not use registered metadata: %q", output.String())
	}
	if got := current.usageLine([]string{"late"}); !strings.HasPrefix(got, "Usage: example late") {
		t.Fatalf("usage after registration = %q", got)
	}
}