package file

import (
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
)

func TestWrite(t *testing.T) {
	tester := func(in string) error {
		err := Write(in, []byte("GoCryptoTrader"))
		if err != nil {
			return err
		}
		return os.Remove(in)
	}

	type testTable struct {
		InFile      string
		ErrExpected bool
		Cleanup     bool
	}

	var tests []testTable
	tempDir := filepath.Join(os.TempDir(), "gct-temp")
	testFile := filepath.Join(tempDir, "gcttest.txt")
	switch runtime.GOOS {
	case "windows":
		tests = []testTable{
			{InFile: "*", ErrExpected: true},
			{InFile: testFile, ErrExpected: false},
		}
	default:
		tests = []testTable{
			{InFile: "", ErrExpected: true},
			{InFile: testFile, ErrExpected: false},
		}
	}

	for x := range tests {
		err := tester(tests[x].InFile)
		if err != nil && !tests[x].ErrExpected {
			t.Errorf("Test %d failed, unexpected err %s\n", x, err)
		}
	}

	if err := os.RemoveAll(tempDir); err != nil {
		t.Errorf("unable to remove temp test dir %s, manual deletion required", tempDir)
	}
}

func TestMove(t *testing.T) {
	tester := func(in, out string, write bool) error {
		if write {
			if err := ioutil.WriteFile(in, []byte("GoCryptoTrader"), 0770); err != nil {
				return err
			}
		}

		if err := Move(in, out); err != nil {
			return err
		}

		contents, err := ioutil.ReadFile(out)
		if err != nil {
			return err
		}

		if !strings.Contains(string(contents), "GoCryptoTrader") {
			return fmt.Errorf("unable to find previously written data")
		}

		return os.Remove(out)
	}

	type testTable struct {
		InFile      string
		OutFile     string
		Write       bool
		ErrExpected bool
	}

	var tests []testTable
	switch runtime.GOOS {
	case "windows":
		tests = []testTable{
			{InFile: "*", OutFile: "gct.txt", Write: true, ErrExpected: true},
			{InFile: "*", OutFile: "gct.txt", Write: false, ErrExpected: true},
			{InFile: "in.txt", OutFile: "*", Write: true, ErrExpected: true},
			{InFile: "in.txt", OutFile: "gct.txt", Write: true, ErrExpected: false},
		}
	default:
		tests = []testTable{
			{InFile: "", OutFile: "gct.txt", Write: true, ErrExpected: true},
			{InFile: "", OutFile: "gct.txt", Write: false, ErrExpected: true},
			{InFile: "in.txt", OutFile: "", Write: true, ErrExpected: true},
			{InFile: "in.txt", OutFile: "gct.txt", Write: true, ErrExpected: false},
		}
	}

	for x := range tests {
		err := tester(tests[x].InFile, tests[x].OutFile, tests[x].Write)
		if err != nil && !tests[x].ErrExpected {
			t.Errorf("Test %d failed, unexpected err %s\n", x, err)
		}
	}
}

func TestExists(t *testing.T) {
	if e := Exists("non-existent"); e {
		t.Error("non-existent file should not exist")
	}
	tmpFile := filepath.Join(os.TempDir(), "gct-test.txt")
	if err := ioutil.WriteFile(tmpFile, []byte("hello world"), os.ModeAppend); err != nil {
		t.Fatal(err)
	}
	if e := Exists(tmpFile); !e {
		t.Error("file should exist")
	}
	if err := os.Remove(tmpFile); err != nil {
		t.Errorf("unable to remove %s, manual deletion is required", tmpFile)
	}
}

func TestWriteAsCSV(t *testing.T) {
	tester := func(in string, data [][]string) error {
		err := WriteAsCSV(in, data)
		if err != nil {
			return err
		}
		return os.Remove(in)
	}

	type testTable struct {
		InFile      string
		Payload     [][]string
		ErrExpected bool
	}

	records := [][]string{
		{"title", "first_name", "last_name"},
		{"King", "Robert", "Baratheon"},
		{"Lord Regent of the Seven Kingdoms", "Eddard", "Stark"},
		{"Lord of Baelish Castle", "Petyr", "Baelish"},
	}

	missAligned := [][]string{
		{"first_name", "last_name", "username"},
		{"Sup", "bra"},
	}

	testFile, err := ioutil.TempFile(os.TempDir(), "gct-csv-test.*.csv")
	if err != nil {
		t.Fatal(err)
	}
	testFile.Close()
	defer os.Remove(testFile.Name())

	tests := []testTable{
		{InFile: testFile.Name(), Payload: nil, ErrExpected: true},
		{InFile: testFile.Name(), Payload: records, ErrExpected: false},
		{InFile: testFile.Name(), Payload: missAligned, ErrExpected: true},
	}
	switch runtime.GOOS {
	case "windows":
		tests = append(tests,
			testTable{InFile: "*", Payload: [][]string{}, ErrExpected: true},
			testTable{InFile: "*", Payload: nil, ErrExpected: true},
		)
	default:
		tests = append(tests,
			testTable{InFile: "", Payload: [][]string{}, ErrExpected: true},
			testTable{InFile: "", Payload: nil, ErrExpected: true},
		)
	}

	for x := range tests {
		err := tester(tests[x].InFile, tests[x].Payload)
		if err != nil && !tests[x].ErrExpected {
			t.Errorf("Test %d failed, unexpected err %s\n", x, err)
		}
	}
}