package cmds

import (
	"bytes"
	"fmt"
	"io"
	"reflect"
	"sort"
	"testing"
)

func TestOutHandler(t *testing.T) {
	buf := &bytes.Buffer{}

	saveTestHarnessStdout := testHarnessStdout
	testHarnessStdout = buf
	defer func() {
		testHarnessStdout = saveTestHarnessStdout
	}()

	data := tplData{
		Table: "patrick",
	}

	templateOutputs := [][]byte{[]byte("hello world"), []byte("patrick's dreams")}

	if err := outHandler("", templateOutputs, &data, &imports{}, false); err != nil {
		t.Error(err)
	}

	if out := buf.String(); out != "package patrick\n\nhello world\npatrick's dreams\n" {
		t.Errorf("Wrong output: %q", out)
	}
}

type NopWriteCloser struct {
	io.Writer
}

func (NopWriteCloser) Close() error {
	return nil
}

func nopCloser(w io.Writer) io.WriteCloser {
	return NopWriteCloser{w}
}

func TestOutHandlerFiles(t *testing.T) {
	saveTestHarnessFileOpen := testHarnessFileOpen
	defer func() {
		testHarnessFileOpen = saveTestHarnessFileOpen
	}()

	file := &bytes.Buffer{}
	testHarnessFileOpen = func(path string) (io.WriteCloser, error) {
		return nopCloser(file), nil
	}

	data := tplData{
		Table: "patrick",
	}

	templateOutputs := [][]byte{[]byte("hello world"), []byte("patrick's dreams")}

	if err := outHandler("folder", templateOutputs, &data, &imports{}, false); err != nil {
		t.Error(err)
	}
	if out := file.String(); out != "package patrick\n\nhello world\npatrick's dreams\n" {
		t.Errorf("Wrong output: %q", out)
	}

	a1 := imports{
		standard: []string{
			`"fmt"`,
		},
	}
	file = &bytes.Buffer{}

	if err := outHandler("folder", templateOutputs, &data, &a1, false); err != nil {
		t.Error(err)
	}
	if out := file.String(); out != "package patrick\n\nimport \"fmt\"\nhello world\npatrick's dreams\n" {
		t.Errorf("Wrong output: %q", out)
	}

	a2 := imports{
		thirdparty: []string{
			`"github.com/spf13/cobra"`,
		},
	}
	file = &bytes.Buffer{}

	if err := outHandler("folder", templateOutputs, &data, &a2, false); err != nil {
		t.Error(err)
	}
	if out := file.String(); out != "package patrick\n\nimport \"github.com/spf13/cobra\"\nhello world\npatrick's dreams\n" {
		t.Errorf("Wrong output: %q", out)
	}

	a3 := imports{
		standard: []string{
			`"fmt"`,
			`"errors"`,
		},
		thirdparty: []string{
			`_ "github.com/lib/pq"`,
			`_ "github.com/gorilla/n"`,
			`"github.com/gorilla/mux"`,
			`"github.com/gorilla/websocket"`,
		},
	}
	file = &bytes.Buffer{}

	sort.Sort(ImportSorter(a3.standard))
	sort.Sort(ImportSorter(a3.thirdparty))

	if err := outHandler("folder", templateOutputs, &data, &a3, false); err != nil {
		t.Error(err)
	}

	expectedOut := `package patrick

import (
	"errors"
	"fmt"

	"github.com/gorilla/mux"
	_ "github.com/gorilla/n"
	"github.com/gorilla/websocket"
	_ "github.com/lib/pq"
)

hello world
patrick's dreams
`

	if out := file.String(); out != expectedOut {
		t.Errorf("Wrong output (len %d, len %d): \n\n%q\n\n%q", len(out), len(expectedOut), out, expectedOut)
	}
}

func TestSortImports(t *testing.T) {
	t.Parallel()

	a1 := []string{
		`"fmt"`,
		`"errors"`,
	}
	a2 := []string{
		`_ "github.com/lib/pq"`,
		`_ "github.com/gorilla/n"`,
		`"github.com/gorilla/mux"`,
		`"github.com/gorilla/websocket"`,
	}

	a1Expected := []string{"errors", "fmt"}
	a2Expected := []string{
		`"github.com/gorilla/mux"`,
		`_ "github.com/gorilla/n"`,
		`"github.com/gorilla/websocket"`,
		`_ "github.com/lib/pq"`,
	}

	sort.Sort(ImportSorter(a1))
	if !reflect.DeepEqual(a1, a1Expected) {
		fmt.Errorf("Expected a1 to match a1Expected, got: %v", a1)
	}

	for i, v := range a1 {
		if v != a1Expected[i] {
			fmt.Errorf("Expected a1[%d] to match a1Expected[%d]:\n%s\n%s\n", i, i, v, a1Expected[i])
		}
	}

	sort.Sort(ImportSorter(a2))
	if !reflect.DeepEqual(a2, a2Expected) {
		fmt.Errorf("Expected a2 to match a2expected, got: %v", a2)
	}

	for i, v := range a2 {
		if v != a2Expected[i] {
			fmt.Errorf("Expected a2[%d] to match a2Expected[%d]:\n%s\n%s\n", i, i, v, a1Expected[i])
		}
	}
}

func TestCombineImports(t *testing.T) {
	t.Parallel()

	a := imports{
		standard:   []string{"fmt"},
		thirdparty: []string{"github.com/pobri19/sqlboiler", "gopkg.in/guregu/null.v3"},
	}
	b := imports{
		standard:   []string{"os"},
		thirdparty: []string{"github.com/pobri19/sqlboiler"},
	}

	c := combineImports(a, b)

	if c.standard[0] != "fmt" && c.standard[1] != "os" {
		t.Errorf("Wanted: fmt, os got: %#v", c.standard)
	}
	if c.thirdparty[0] != "github.com/pobri19/sqlboiler" && c.thirdparty[1] != "gopkg.in/guregu/null.v3" {
		t.Errorf("Wanted: github.com/pobri19/sqlboiler, gopkg.in/guregu/null.v3 got: %#v", c.thirdparty)
	}
}

func TestRemoveDuplicates(t *testing.T) {
	t.Parallel()

	hasDups := func(possible []string) error {
		for i := 0; i < len(possible)-1; i++ {
			for j := i + 1; j < len(possible); j++ {
				if possible[i] == possible[j] {
					return fmt.Errorf("found duplicate: %s [%d] [%d]", possible[i], i, j)
				}
			}
		}

		return nil
	}

	if len(removeDuplicates([]string{})) != 0 {
		t.Error("It should have returned an empty slice")
	}

	oneItem := []string{"patrick"}
	slice := removeDuplicates(oneItem)
	if ln := len(slice); ln != 1 {
		t.Error("Length was wrong:", ln)
	} else if oneItem[0] != slice[0] {
		t.Errorf("Slices differ: %#v %#v", oneItem, slice)
	}

	slice = removeDuplicates([]string{"hello", "patrick", "hello"})
	if ln := len(slice); ln != 2 {
		t.Error("Length was wrong:", ln)
	}
	if err := hasDups(slice); err != nil {
		t.Error(err)
	}

	slice = removeDuplicates([]string{"five", "patrick", "hello", "hello", "patrick", "hello", "hello"})
	if ln := len(slice); ln != 3 {
		t.Error("Length was wrong:", ln)
	}
	if err := hasDups(slice); err != nil {
		t.Error(err)
	}
}

func TestCombineStringSlices(t *testing.T) {
	t.Parallel()

	var a, b []string
	slice := combineStringSlices(a, b)
	if ln := len(slice); ln != 0 {
		t.Error("Len was wrong:", ln)
	}

	a = []string{"1", "2"}
	slice = combineStringSlices(a, b)
	if ln := len(slice); ln != 2 {
		t.Error("Len was wrong:", ln)
	} else if slice[0] != a[0] || slice[1] != a[1] {
		t.Errorf("Slice mismatch: %#v %#v", a, slice)
	}

	b = a
	a = nil
	slice = combineStringSlices(a, b)
	if ln := len(slice); ln != 2 {
		t.Error("Len was wrong:", ln)
	} else if slice[0] != b[0] || slice[1] != b[1] {
		t.Errorf("Slice mismatch: %#v %#v", b, slice)
	}

	a = b
	b = []string{"3", "4"}
	slice = combineStringSlices(a, b)
	if ln := len(slice); ln != 4 {
		t.Error("Len was wrong:", ln)
	} else if slice[0] != a[0] || slice[1] != a[1] || slice[2] != b[0] || slice[3] != b[1] {
		t.Errorf("Slice mismatch: %#v + %#v != #%v", a, b, slice)
	}
}