package swagger

import (
	"bytes"
	"encoding/json"
	"fmt"
	"reflect"
	"strings"
	"testing"
)

func testJsonFromStruct(t *testing.T, sample interface{}, expectedJson string) bool {
	m := modelsFromStruct(sample)
	data, _ := json.MarshalIndent(m, " ", " ")
	return compareJson(t, string(data), expectedJson)
}

func modelsFromStruct(sample interface{}) *ModelList {
	models := new(ModelList)
	builder := modelBuilder{models}
	builder.addModelFrom(sample)
	return models
}

func compareJson(t *testing.T, actualJsonAsString string, expectedJsonAsString string) bool {
	success := false
	var actualMap map[string]interface{}
	json.Unmarshal([]byte(actualJsonAsString), &actualMap)
	var expectedMap map[string]interface{}
	err := json.Unmarshal([]byte(expectedJsonAsString), &expectedMap)
	if err != nil {
		var actualArray []interface{}
		json.Unmarshal([]byte(actualJsonAsString), &actualArray)
		var expectedArray []interface{}
		err := json.Unmarshal([]byte(expectedJsonAsString), &expectedArray)
		success = reflect.DeepEqual(actualArray, expectedArray)
		if err != nil {
			t.Fatalf("Unparsable expected JSON: %s", err)
		}
	} else {
		success = reflect.DeepEqual(actualMap, expectedMap)
	}
	if !success {
		t.Log("---- expected -----")
		t.Log(withLineNumbers(expectedJsonAsString))
		t.Log("---- actual -----")
		t.Log(withLineNumbers(actualJsonAsString))
		t.Log("---- raw -----")
		t.Log(actualJsonAsString)
		t.Error("there are differences")
		return false
	}
	return true
}

func indexOfNonMatchingLine(actual, expected string) int {
	a := strings.Split(actual, "\n")
	e := strings.Split(expected, "\n")
	size := len(a)
	if len(e) < len(a) {
		size = len(e)
	}
	for i := 0; i < size; i++ {
		if a[i] != e[i] {
			return i
		}
	}
	return -1
}

func withLineNumbers(content string) string {
	var buffer bytes.Buffer
	lines := strings.Split(content, "\n")
	for i, each := range lines {
		buffer.WriteString(fmt.Sprintf("%d:%s\n", i, each))
	}
	return buffer.String()
}
