package configkit_test

import (
	"strings"
	"testing"
	"testing/fstest"

	configkit "go.maximumdirect.net/configkit"
)

func TestDocumentRootControlsAndNestedApplicationConfig(t *testing.T) {
	type settings struct {
		Imports string `yaml:"imports"`
	}
	type app struct {
		Service struct {
			Config settings `yaml:"config"`
		} `yaml:"service"`
	}
	result, err := configkit.Load[app](configkit.Bytes("main", []byte("config: {sequences: []}\nservice: {config: {imports: ordinary}}\n")))
	if err != nil || result.Config.Service.Config.Imports != "ordinary" {
		t.Fatalf("result = %#v, error = %v", result, err)
	}
}

func TestMountedConfigDataKeepsControlEvidenceAndHiding(t *testing.T) {
	type settings struct {
		Imports string `yaml:"imports"`
		Token   string `yaml:"token" configkit:"secret"`
	}
	type app struct {
		Config settings `yaml:"config"`
	}
	fs := configkit.NewFilesystem("bundle", fstest.MapFS{
		"main.yml": {Data: []byte("config: {imports: [{path: missing.yml}, {path: data.yml, destination: [config]}]}\n")},
		"data.yml": {Data: []byte("imports: ordinary\ntoken: disposable-canary\n")},
	})
	result, err := configkit.Load[app](fs.File("main.yml"), configkit.Options[app]{Imports: true})
	if err != nil {
		t.Fatal(err)
	}
	if result.Config.Config.Imports != "ordinary" {
		t.Fatalf("config = %#v", result.Config)
	}
	sources := result.Sources()
	if len(sources) != 2 || len(sources[0].EmptyImportSelections) != 1 || sources[0].EmptyImportSelections[0].Path.String() != "/config/imports/0" {
		t.Fatalf("sources = %#v", sources)
	}
	if _, ok := result.Metadata().Lookup(configkit.Keys("config", "imports")); !ok {
		t.Fatal("missing application value")
	}
	if _, ok := result.Explain(configkit.Keys("config", "imports")); !ok {
		t.Fatal("missing explanation")
	}
	var output strings.Builder
	if err := result.WriteEffective(&output); err != nil || strings.Contains(output.String(), "disposable-canary") || !strings.Contains(output.String(), "ordinary") {
		t.Fatalf("effective output = %q, %v", output.String(), err)
	}
}

func TestOldControlSpellingsAreOrdinaryData(t *testing.T) {
	body := "configkit: {imports: [{path: nonexistent.yml}]}\n_configkit: ordinary\n"
	result, err := configkit.Load[map[string]any](configkit.Bytes("old", []byte(body)))
	if err != nil || result.Config["configkit"] == nil || result.Config["_configkit"] != "ordinary" {
		t.Fatalf("result = %#v, error = %v", result, err)
	}
	if _, err := configkit.Load[struct{}](configkit.Bytes("strict", []byte(body))); err == nil {
		t.Fatal("strict schema accepted unknown data")
	}
}

func TestDefaultsOverridesAndResolutionAtConfigRoot(t *testing.T) {
	type settings struct {
		Enabled bool `yaml:"enabled"`
		Count   int  `yaml:"count"`
	}
	type app struct {
		Config settings `yaml:"config"`
	}
	entryExplicit := false
	entryCountExplicit := false
	result, err := configkit.Load[app](configkit.NoSource(), configkit.Options[app]{
		Definition: configkit.Definition[app]{
			Defaults: func() app { return app{Config: settings{Enabled: true, Count: 2}} },
			Resolve: func(value *app, r *configkit.Resolution) error {
				info, ok := r.EntryInfo(configkit.Keys("config", "enabled"))
				entryExplicit = ok && info.Explicit && info.Origin.Layer == configkit.LayerCLI
				entryCountExplicit = r.IsExplicit(configkit.Keys("config", "count"))
				value.Config.Count = 7
				r.RecordNormalization(configkit.Keys("config", "count"), "normalize count")
				return nil
			},
		},
		Overrides: []configkit.Override{{Path: configkit.Keys("config", "enabled"), Value: false, Flag: "--enabled"}},
	})
	if err != nil || result == nil || !entryExplicit || entryCountExplicit || result.Config.Config.Enabled || result.Config.Config.Count != 7 {
		t.Fatalf("result = %#v, entry explicit = %t, error = %v", result, entryExplicit, err)
	}
	if info, ok := result.Metadata().Lookup(configkit.Keys("config", "enabled")); !ok || !info.Explicit || info.Origin.Layer != configkit.LayerCLI {
		t.Fatalf("final enabled info = %#v, %t", info, ok)
	}
	if info, ok := result.Metadata().Lookup(configkit.Keys("config", "count")); !ok || info.Origin.Layer != configkit.LayerResolution {
		t.Fatalf("final count info = %#v, %t", info, ok)
	}
	if _, ok := result.Explain(configkit.Keys("config", "count")); !ok {
		t.Fatal("missing resolution explanation")
	}
}