package commandkit

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

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

func TestAppParseUsesRegisteredBindingsWithTheAdapter(t *testing.T) {
	type input struct {
		scope Supplied[string]
		id    Supplied[string]
	}
	show, err := 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() },
	})
	if err != nil {
		t.Fatal(err)
	}
	config, err := Group("config", "configuration", show)
	if err != nil {
		t.Fatal(err)
	}
	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 TestBridgeTreeRefreshesAfterSuccessfulRegistration(t *testing.T) {
	app, err := New(Identity{Name: "example"})
	if err != nil {
		t.Fatal(err)
	}
	var output bytes.Buffer
	streams := Streams{Out: &output, Err: io.Discard}
	renderRootHelp := func() string {
		t.Helper()
		output.Reset()
		outcome := app.Execute(context.Background(), []string{"--help"}, streams)
		if outcome.Kind != OutcomeSuccess {
			t.Fatalf("root help outcome = %#v", outcome)
		}
		return output.String()
	}
	initial := renderRootHelp()
	if strings.Contains(initial, "custom") || strings.Contains(initial, "config") || strings.Contains(initial, "promptkit") {
		t.Fatalf("initial help unexpectedly lists future registrations: %q", initial)
	}

	custom, err := NewCommand(CommandSpec[struct{}]{Name: "custom", Run: func(Invocation, struct{}) Outcome { return Success() }})
	if err != nil {
		t.Fatal(err)
	}
	if err := app.Register(custom); err != nil {
		t.Fatal(err)
	}
	providerCalls := 0
	if err := RegisterConfig(app, ConfigSuite[struct{}]{Scopes: []ConfigScope[struct{}]{{
		Name:       "app",
		Operations: []ConfigOperation{ConfigShow},
		Acquire: func(context.Context, ConfigRequest, struct{}) (Acquired[ConfigView], error) {
			providerCalls++
			return Acquired[ConfigView]{}, nil
		},
	}}}); err != nil {
		t.Fatal(err)
	}
	if err := RegisterPromptKit(app, PromptKitSuite[struct{}]{InspectPrompt: func(context.Context, Selection, struct{}, string, string) (Acquired[*promptkit.PromptInspection], error) {
		providerCalls++
		return Acquired[*promptkit.PromptInspection]{}, nil
	}}); err != nil {
		t.Fatal(err)
	}
	updated := renderRootHelp()
	for _, name := range []string{"custom", "config", "promptkit"} {
		if !strings.Contains(updated, name) {
			t.Errorf("updated help omits %q: %q", name, updated)
		}
	}
	if providerCalls != 0 {
		t.Fatalf("help invoked inspection or configuration callbacks %d times", providerCalls)
	}

	late, err := NewCommand(CommandSpec[struct{}]{Name: "late"})
	if err != nil {
		t.Fatal(err)
	}
	if err := app.Register(late, custom); err == nil {
		t.Fatal("Register accepted a batch with an existing-name collision")
	}
	if err := app.Register(); err != nil {
		t.Fatalf("empty registration failed: %v", err)
	}
	final := renderRootHelp()
	if !strings.Contains(final, "custom") || !strings.Contains(final, "config") || !strings.Contains(final, "promptkit") || strings.Contains(final, "late") {
		t.Fatalf("help after failed and empty registration = %q", final)
	}
	if outcome := app.Execute(context.Background(), []string{"custom"}, streams); outcome.Kind != OutcomeSuccess {
		t.Fatalf("new command did not parse after registration: %#v", outcome)
	}
}