package platform

import (
	"encoding/json"
	"testing"
)

const operationsFixture = `{"schema_version":2,"nodes":[{"id":"a","type":"plainText","position":{"x":0,"y":0},"width":240,"height":72,"data":{"kind":"plain-text","title":"original","text":"hello"}}],"edges":[],"viewport":{"x":0,"y":0,"zoom":1}}`

func TestCanvasOperationBatchStagesAndMerges(t *testing.T) {
	initial := map[string]canvasSnapshot{"board": {BoardID: "board", Version: 7, Document: json.RawMessage(operationsFixture)}}
	operations := []canvasOperation{
		{ID: "11111111-1111-4111-8111-111111111111", Type: "node.patch", CanvasID: "board", ElementID: "a", Patch: map[string]json.RawMessage{"data": json.RawMessage(`{"title":"renamed"}`)}},
		{ID: "22222222-2222-4222-8222-222222222222", Type: "node.patch", CanvasID: "board", ElementID: "a", Patch: map[string]json.RawMessage{"position": json.RawMessage(`{"x":90,"y":20}`)}},
	}
	result, err := applyCanvasOperations(initial, operations)
	if err != nil {
		t.Fatal(err)
	}
	if result["board"].Version != 8 {
		t.Fatal("version did not advance once")
	}
	var document struct {
		Nodes []struct {
			Position struct{ X float64 }
			Data     struct {
				Title string
				Text  string
			}
		}
	}
	if err = json.Unmarshal(result["board"].Document, &document); err != nil {
		t.Fatal(err)
	}
	if document.Nodes[0].Data.Title != "renamed" || document.Nodes[0].Data.Text != "hello" || document.Nodes[0].Position.X != 90 {
		t.Fatal("field merge lost unrelated content")
	}
	if string(initial["board"].Document) != operationsFixture {
		t.Fatal("input snapshot mutated")
	}
}
func TestCanvasOperationBatchRejectsWithoutPartialOutput(t *testing.T) {
	initial := map[string]canvasSnapshot{"board": {BoardID: "board", Version: 1, Document: json.RawMessage(operationsFixture)}}
	for _, operation := range []canvasOperation{
		{ID: "11111111-1111-4111-8111-111111111111", Type: "node.patch", CanvasID: "board", ElementID: "a", Patch: map[string]json.RawMessage{"id": json.RawMessage(`"stolen"`)}},
		{ID: "11111111-1111-4111-8111-111111111111", Type: "node.patch", CanvasID: "board", ElementID: "missing", Patch: map[string]json.RawMessage{"data": json.RawMessage(`{"title":"no"}`)}},
		{ID: "11111111-1111-4111-8111-111111111111", Type: "edge.create", CanvasID: "board", ElementID: "edge", Record: json.RawMessage(`{"id":"edge","source":"a","target":"missing"}`)},
	} {
		if result, err := applyCanvasOperations(initial, []canvasOperation{operation}); err == nil || result != nil {
			t.Fatal("invalid batch partially accepted")
		}
	}
}
func TestCanvasOperationBatchValidatesFinalGraphInsteadOfIntermediateState(t *testing.T) {
	initial := map[string]canvasSnapshot{"board": {BoardID: "board", Version: 1, Document: json.RawMessage(operationsFixture)}}
	operations := []canvasOperation{
		{ID: "11111111-1111-4111-8111-111111111111", Type: "edge.create", CanvasID: "board", ElementID: "edge", Record: json.RawMessage(`{"id":"edge","source":"a","target":"b"}`)},
		{ID: "22222222-2222-4222-8222-222222222222", Type: "node.create", CanvasID: "board", ElementID: "b", Record: json.RawMessage(`{"id":"b","type":"plainText","position":{"x":20,"y":20},"width":240,"height":72,"data":{"kind":"plain-text","title":"b","text":""}}`)},
	}
	if _, err := applyCanvasOperations(initial, operations); err != nil {
		t.Fatal(err)
	}
}