package ckconfig

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"io"
	"reflect"
	"strings"
	"testing"

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

func TestFocusedShowUsesSafeNativeValue(t *testing.T) {
	loads := 0
	scope := FromConfigKit("app", "", func(_ context.Context, selection Selection, _, _ struct{}) (*configkit.Result[map[string]any], error) {
		loads++
		return configkit.Load(configkit.Mapping("fixture", map[string]any{"object": map[string]any{"x": "y"}, "text": "hello", "false": false, "zero": 0, "null": nil, "gone": map[string]any{"x": 1}}), configkit.Options[map[string]any]{Overrides: selection.Overrides})
	})
	scope.Features.Overrides = true
	app := newConfigTestApp(t, Command(Suite[struct{}, struct{}]{Scopes: []Scope[struct{}, struct{}]{scope}}))
	for _, test := range []struct {
		path string
		want any
	}{{"/object", map[string]any{"x": "y"}}, {"/text", "hello"}, {"/false", false}, {"/zero", float64(0)}, {"/null", nil}} {
		var out bytes.Buffer
		result := app.Execute(context.Background(), []string{"config", "show", "--path=" + test.path, "--format=json"}, commandkit.Streams{Out: &out, Err: io.Discard})
		var got any
		if result.Kind != commandkit.OutcomeSuccess || json.Unmarshal(out.Bytes(), &got) != nil || !reflect.DeepEqual(got, test.want) {
			t.Fatalf("%s: %#v %q", test.path, result, out.String())
		}
	}
	var out bytes.Buffer
	result := app.Execute(context.Background(), []string{"config", "show", "--path=/text"}, commandkit.Streams{Out: &out, Err: io.Discard})
	if result.Kind != commandkit.OutcomeSuccess || out.String() != "hello\n" {
		t.Fatalf("automatic text: %#v %q", result, out.String())
	}
	out.Reset()
	result = app.Execute(context.Background(), []string{"config", "show", "--path=/false", "--format=yaml"}, commandkit.Streams{Out: &out, Err: io.Discard})
	if result.Kind != commandkit.OutcomeSuccess || strings.TrimSpace(out.String()) != "false" {
		t.Fatalf("yaml false: %#v %q", result, out.String())
	}
	for _, args := range [][]string{{"--path=/missing"}, {"--path=/gone/x", "--set=/gone=null"}} {
		result = app.Execute(context.Background(), append([]string{"config", "show"}, args...), commandkit.Streams{Out: io.Discard, Err: io.Discard})
		if result.Kind != commandkit.OutcomeOperational {
			t.Fatalf("missing %v: %#v", args, result)
		}
	}
	before := loads
	for _, args := range [][]string{{"--path=bad"}, {"--scope=all", "--path=/text"}} {
		result = app.Execute(context.Background(), append([]string{"config", "show"}, args...), commandkit.Streams{Out: io.Discard, Err: io.Discard})
		if result.Kind != commandkit.OutcomeUsage || loads != before {
			t.Fatalf("preflight %v: %#v", args, result)
		}
	}
}

func TestFocusedShowChecksCapabilityAndFacet(t *testing.T) {
	calls := 0
	scope := Scope[struct{}, struct{}]{Name: "app", Operations: []Operation{Show}, Acquire: func(context.Context, Request, struct{}, struct{}) (commandkit.Acquired[View], error) {
		calls++
		return commandkit.Acquired[View]{}, nil
	}}
	app := newConfigTestApp(t, Command(Suite[struct{}, struct{}]{Scopes: []Scope[struct{}, struct{}]{scope}}))
	result := app.Execute(context.Background(), []string{"config", "show", "--path=/x"}, commandkit.Streams{Out: io.Discard, Err: io.Discard})
	if result.Kind != commandkit.OutcomeUsage || calls != 0 {
		t.Fatalf("unsupported: %#v", result)
	}
	scope.Features.PathShow = true
	app = newConfigTestApp(t, Command(Suite[struct{}, struct{}]{Scopes: []Scope[struct{}, struct{}]{scope}}))
	result = app.Execute(context.Background(), []string{"config", "show", "--path=/x"}, commandkit.Streams{Out: io.Discard, Err: io.Discard})
	if result.Kind != commandkit.OutcomeOperational || calls != 1 {
		t.Fatalf("missing facet: %#v", result)
	}
}

func TestSourcesFilterAndFailureEvidence(t *testing.T) {
	cause := errors.New("load failed")
	reader := &sourceInventory{values: []configkit.SourceInfo{{ID: "one", Label: "first"}, {ID: "two", Label: "second"}}}
	var returnedErr error
	var source SourceReader = reader
	scope := Scope[struct{}, struct{}]{Name: "app", Operations: []Operation{Sources}, Acquire: func(context.Context, Request, struct{}, struct{}) (commandkit.Acquired[View], error) {
		return commandkit.Acquired[View]{Value: View{Sources: source}}, returnedErr
	}}
	app := newConfigTestApp(t, Command(Suite[struct{}, struct{}]{Scopes: []Scope[struct{}, struct{}]{scope}}))
	run := func(args ...string) (commandkit.Outcome, string, string) {
		var out, diag bytes.Buffer
		result := app.Execute(context.Background(), append([]string{"config", "sources"}, args...), commandkit.Streams{Out: &out, Err: &diag})
		return result, out.String(), diag.String()
	}
	result, out, _ := run("--source-id=two", "--format=json")
	if result.Kind != commandkit.OutcomeSuccess || !strings.Contains(out, `"id": "two"`) || strings.Contains(out, `"id": "one"`) {
		t.Fatalf("selected source: %#v %q", result, out)
	}
	result, _, _ = run("--source-id=missing")
	if result.Kind != commandkit.OutcomeOperational {
		t.Fatalf("unknown source: %#v", result)
	}
	returnedErr = cause
	result, out, _ = run("--source-id=one", "--format=json")
	if !errors.Is(result.Cause, cause) || !strings.Contains(out, `"id": "one"`) || strings.Contains(out, `"id": "two"`) {
		t.Fatalf("failed selection: %#v %q", result, out)
	}
	result, _, diag := run("--source-id=missing")
	if !errors.Is(result.Cause, cause) || !strings.Contains(diag, "not found") {
		t.Fatalf("failed missing source: %#v %q", result, diag)
	}
	source = &sourceInventory{}
	result, out, _ = run("--format=json")
	if !errors.Is(result.Cause, cause) || !strings.Contains(out, `"sources": []`) {
		t.Fatalf("empty evidence: %#v %q", result, out)
	}
	source = nil
	result, out, diag = run()
	if !errors.Is(result.Cause, cause) || out != "" || !strings.Contains(diag, "unavailable") {
		t.Fatalf("unavailable evidence: %#v %q %q", result, out, diag)
	}
	source = reader
	result = app.Execute(context.Background(), []string{"config", "sources"}, commandkit.Streams{Out: shortWriter{}, Err: io.Discard})
	if !errors.Is(result.Cause, cause) || result.Presentation.Output.State != commandkit.DeliveryIncomplete {
		t.Fatalf("delivery failure: %#v", result)
	}
}