package ckconfig

import (
	"context"
	"io"
	"reflect"
	"testing"

	commandkit "go.maximumdirect.net/commandkit"
	configkit "go.maximumdirect.net/configkit"
)

func TestComparisonSidesKeepIndependentSelectionsAndDefaults(t *testing.T) {
	type input struct {
		Label commandkit.Supplied[string]
		Tags  []string
	}
	label := commandkit.ValueFlag(commandkit.FlagMeta{Name: "label"}, (*string)(nil), parseConfigString, func(i *input, value commandkit.Supplied[string]) { i.Label = value })
	tags := commandkit.RepeatFlag(commandkit.FlagMeta{Name: "tag"}, []string(nil), parseConfigString, func(i *input, value commandkit.Supplied[[]string]) { i.Tags = value.Value })
	var pair ComparisonRequest[input]
	calls := 0
	suite := Suite[input, struct{}]{
		NewInput: func() input {
			return input{Label: commandkit.Supplied[string]{Value: "factory"}, Tags: []string{"factory"}}
		},
		Selectors: []Selector[input]{{Binding: label, AgainstName: "against-label"}, {Binding: tags, AgainstName: "against-tag"}},
		Scopes: []Scope[input, struct{}]{{Name: "app", Operations: []Operation{Diff}, Compare: func(_ context.Context, request ComparisonRequest[input], _ struct{}) (commandkit.Acquired[[]configkit.Difference], error) {
			calls++
			pair = request
			return commandkit.Acquired[[]configkit.Difference]{}, nil
		}}},
	}
	app := newConfigTestApp(t, Command(suite))
	tests := []struct {
		args                  []string
		left, right           Selection
		leftLabel, rightLabel commandkit.Supplied[string]
		leftTags, rightTags   []string
	}{
		{leftLabel: commandkit.Supplied[string]{Value: "factory"}, rightLabel: commandkit.Supplied[string]{Value: "factory"}, leftTags: []string{"factory"}, rightTags: []string{"factory"}},
		{args: []string{"--config=left", "--overlay=base", "--label=", "--tag=a", "--tag=b"}, left: Selection{Config: commandkit.Supplied[string]{Value: "left", Set: true}, Overlay: commandkit.Supplied[string]{Value: "base", Set: true}}, leftLabel: commandkit.Supplied[string]{Set: true}, rightLabel: commandkit.Supplied[string]{Value: "factory"}, leftTags: []string{"a", "b"}, rightTags: []string{"factory"}},
		{args: []string{"--against-config=right", "--against-label=r", "--against-tag=x"}, right: Selection{Config: commandkit.Supplied[string]{Value: "right", Set: true}}, leftLabel: commandkit.Supplied[string]{Value: "factory"}, rightLabel: commandkit.Supplied[string]{Value: "r", Set: true}, leftTags: []string{"factory"}, rightTags: []string{"x"}},
		{args: []string{"--config=left", "--against-overlay=", "--label=l", "--against-label=r", "--tag=a", "--against-tag=b"}, left: Selection{Config: commandkit.Supplied[string]{Value: "left", Set: true}}, right: Selection{Overlay: commandkit.Supplied[string]{Set: true}}, leftLabel: commandkit.Supplied[string]{Value: "l", Set: true}, rightLabel: commandkit.Supplied[string]{Value: "r", Set: true}, leftTags: []string{"a"}, rightTags: []string{"b"}},
	}
	for _, test := range tests {
		result := app.Execute(context.Background(), append([]string{"config", "diff"}, test.args...), commandkit.Streams{Out: io.Discard, Err: io.Discard})
		if result.Kind != commandkit.OutcomeSuccess || !reflect.DeepEqual(pair.Left.Selection, test.left) || !reflect.DeepEqual(pair.Right.Selection, test.right) || pair.Left.Input.Label != test.leftLabel || pair.Right.Input.Label != test.rightLabel || !reflect.DeepEqual(pair.Left.Input.Tags, test.leftTags) || !reflect.DeepEqual(pair.Right.Input.Tags, test.rightTags) {
			t.Fatalf("args=%v outcome=%#v pair=%#v", test.args, result, pair)
		}
	}
	if calls != len(tests) {
		t.Fatalf("provider calls = %d", calls)
	}
}

func TestComparisonRequiredCounterpartsAndCollisions(t *testing.T) {
	flag := commandkit.ValueFlag(commandkit.FlagMeta{Name: "choice", Required: true}, (*string)(nil), parseConfigString, func(i *string, value commandkit.Supplied[string]) { *i = value.Value })
	calls := 0
	scope := Scope[string, struct{}]{Name: "app", Operations: []Operation{Diff}, Compare: func(context.Context, ComparisonRequest[string], struct{}) (commandkit.Acquired[[]configkit.Difference], error) {
		calls++
		return commandkit.Acquired[[]configkit.Difference]{}, nil
	}}
	suite := Suite[string, struct{}]{Selectors: []Selector[string]{{Binding: flag, AgainstName: "against-choice"}}, Scopes: []Scope[string, struct{}]{scope}}
	app := newConfigTestApp(t, Command(suite))
	for _, args := range [][]string{{"--choice=x"}, {"--against-choice=x"}} {
		result := app.Execute(context.Background(), append([]string{"config", "diff"}, args...), commandkit.Streams{Out: io.Discard, Err: io.Discard})
		if result.Kind != commandkit.OutcomeUsage || calls != 0 {
			t.Fatalf("missing side %v: %#v", args, result)
		}
	}
	result := app.Execute(context.Background(), []string{"config", "diff", "--choice=x", "--against-choice=y"}, commandkit.Streams{Out: io.Discard, Err: io.Discard})
	if result.Kind != commandkit.OutcomeSuccess || calls != 1 {
		t.Fatalf("complete sides: %#v", result)
	}
	suite.Selectors[0].AgainstName = "against-config"
	if _, err := commandkit.New(commandkit.Identity{Name: "app"}, Command(suite)); err == nil {
		t.Fatal("conflicting counterpart accepted")
	}
}