package bonfire

import (
	"bytes"
	"context"
	"errors"
	"strings"
	"testing"
)

func newTestRoot(commands []Command, opts ...RootOption) error {
	var buf bytes.Buffer
	_, err := NewRootIO("acme", commands, strings.NewReader(""), &buf, &buf, opts...)
	return err
}

// TestReservedFlags: a command flag that reuses a global option's name or
// shorthand fails NewRoot with an error naming the command and the flag,
// without a panic; Call refuses it the same way.
func TestReservedFlags(t *testing.T) {
	for _, name := range []string{"verbose", "quiet", "ansi", "no-ansi", "no-interaction", "env", "help"} {
		cmd := Command{Name: "acme:loud", Flags: []Flag{{Name: name}}}
		err := newTestRoot([]Command{cmd})
		if !errors.Is(err, ErrReservedFlag) || !strings.Contains(err.Error(), `"acme:loud"`) || !strings.Contains(err.Error(), "--"+name) {
			t.Errorf("--%s: err = %v", name, err)
		}
		if err := Call(context.Background(), []Command{cmd}, "acme:loud", nil, nil); !errors.Is(err, ErrReservedFlag) {
			t.Errorf("Call with --%s: err = %v", name, err)
		}
	}
	for _, short := range []string{"v", "q", "n", "h"} {
		cmd := Command{Name: "acme:loud", Flags: []Flag{{Name: "volume", Shorthand: short}}}
		err := newTestRoot([]Command{cmd})
		if !errors.Is(err, ErrReservedFlag) || !strings.Contains(err.Error(), "-"+short+" for --volume") || !strings.Contains(err.Error(), `"acme:loud"`) {
			t.Errorf("-%s: err = %v", short, err)
		}
	}
	// Other names and shorthands are fine, repeatable and bare ones too.
	ok := Command{Name: "acme:loud", Flags: []Flag{
		{Name: "volume", Shorthand: "V"}, {Name: "environment", Shorthand: "e"},
		{Name: "tag", Shorthand: "t", Repeatable: true}, {Name: "force", Shorthand: "f", Bare: true},
	}}
	if err := newTestRoot([]Command{ok}); err != nil {
		t.Errorf("unreserved flags refused: %v", err)
	}
}

// TestDuplicateNames: two commands with one name, or a command named list
// or help, fail NewRoot with ErrDuplicateCommand naming it.
func TestDuplicateNames(t *testing.T) {
	cases := map[string][]Command{
		"acme:sync": {{Name: "acme:sync"}, {Name: "acme:other"}, {Name: "acme:sync"}},
		"list":      {{Name: "list"}},
		"help":      {{Name: "acme:x"}, {Name: "help"}},
	}
	for name, commands := range cases {
		err := newTestRoot(commands)
		if !errors.Is(err, ErrDuplicateCommand) || !strings.Contains(err.Error(), `"`+name+`"`) {
			t.Errorf("%s: err = %v", name, err)
		}
	}
	if err := newTestRoot([]Command{{Name: "acme:list"}, {Name: "list:all"}, {Name: "acme:help"}}); err != nil {
		t.Errorf("names that only contain list or help refused: %v", err)
	}
	if err := newTestRoot([]Command{{Name: "nonamespace"}}); !errors.Is(err, ErrCommandName) {
		t.Errorf("a plugin command without a namespace: err = %v", err)
	}
}

// TestCallNoGlobalsHook: a root built by Call runs no OnGlobals hook, even
// when called from a command of a root that has one, and the called
// command still sees the globals passed to it.
func TestCallNoGlobalsHook(t *testing.T) {
	var hooked []Globals
	var inner Globals
	target := Command{Name: "acme:inner", Description: "Inner", Run: func(_ context.Context, _ Input, out Output) error {
		inner = GlobalsOf(out)
		return nil
	}}
	outer := Command{Name: "acme:outer", Description: "Outer", Run: func(ctx context.Context, _ Input, out Output) error {
		return NewCatalog([]Command{target}).Call(ctx, "acme:inner", []string{"-vvv", "--env=other"}, out)
	}}
	var buf bytes.Buffer
	root, err := NewRootIO("acme", []Command{outer, target}, strings.NewReader(""), &buf, &buf,
		OnGlobals(func(g Globals) { hooked = append(hooked, g) }))
	if err != nil {
		t.Fatal(err)
	}
	if code := Execute(context.Background(), root, []string{"-v", "acme:outer"}); code != ExitOK {
		t.Fatalf("exit %d:\n%s", code, buf.String())
	}
	if len(hooked) != 1 || hooked[0].Verbosity != 1 || hooked[0].Env != "" {
		t.Errorf("hooks = %+v, want one call with the outer -v", hooked)
	}
	if inner.Verbosity != 3 || inner.Env != "other" {
		t.Errorf("called command saw %+v, want -vvv --env=other", inner)
	}
	if err := Call(context.Background(), []Command{target}, "acme:missing", nil, nil); !errors.Is(err, ErrUnknownCommand) {
		t.Errorf("Call of a missing command: %v", err)
	}
	var nilCatalog *Catalog
	if nilCatalog.Has("acme:inner") || !errors.Is(nilCatalog.Call(context.Background(), "acme:inner", nil, nil), ErrUnknownCommand) {
		t.Error("a nil Catalog has commands")
	}
}