package main

import (
	"bufio"
	"bytes"
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strconv"
	"testing"
)

var state *State
var rgxHasSpaces = regexp.MustCompile(`^\s+`)

func TestNew(t *testing.T) {
	if testing.Short() {
		t.SkipNow()
	}

	var err error
	out, err := ioutil.TempDir("", "boil_templates")
	if err != nil {
		t.Fatalf("unable to create tempdir: %s", err)
	}

	// Defer cleanup of the tmp folder
	defer func() {
		if t.Failed() {
			t.Log("template test output:", state.Config.OutFolder)
			return
		}
		os.RemoveAll(state.Config.OutFolder)
	}()

	config := &Config{
		DriverName:      "mock",
		PkgName:         "models",
		OutFolder:       out,
		BlacklistTables: []string{"hangars"},
	}

	state, err = New(config)
	if err != nil {
		t.Fatalf("Unable to create State using config: %s", err)
	}

	if err = state.Run(false); err != nil {
		t.Errorf("Unable to execute State.Run: %s", err)
	}

	buf := &bytes.Buffer{}

	cmd := exec.Command("go", "test", "-c")
	cmd.Dir = state.Config.OutFolder
	cmd.Stderr = buf

	if err = cmd.Run(); err != nil {
		t.Errorf("go test cmd execution failed: %s", err)
		outputCompileErrors(buf, state.Config.OutFolder)
		fmt.Println()
	}
}

func outputCompileErrors(buf *bytes.Buffer, outFolder string) {
	type errObj struct {
		errMsg     string
		fileName   string
		lineNumber int
	}

	var errObjects []errObj
	lineBuf := &bytes.Buffer{}

	bufLines := bytes.Split(buf.Bytes(), []byte{'\n'})
	for i := 0; i < len(bufLines); i++ {
		lineBuf.Reset()
		if !bytes.HasPrefix(bufLines[i], []byte("./")) {
			continue
		}

		fmt.Fprintf(lineBuf, "%s\n", bufLines[i])

		splits := bytes.Split(bufLines[i], []byte{':'})
		lineNum, err := strconv.Atoi(string(splits[1]))
		if err != nil {
			panic(fmt.Sprintf("Cant convert line number to int: %s", bufLines[i]))
		}

		eObj := errObj{
			fileName:   string(splits[0]),
			lineNumber: lineNum,
		}

		for y := i; y < len(bufLines); y++ {
			if !rgxHasSpaces.Match(bufLines[y]) {
				break
			}
			fmt.Fprintf(lineBuf, "%s\n", bufLines[y])
			i++
		}

		eObj.errMsg = lineBuf.String()

		errObjects = append(errObjects, eObj)
	}

	for _, eObj := range errObjects {
		fmt.Printf("-----------------\n")
		fmt.Println(eObj.errMsg)

		filePath := filepath.Join(outFolder, eObj.fileName)
		fh, err := os.Open(filePath)
		if err != nil {
			panic(fmt.Sprintf("Cant open the file: %#v", eObj))
		}

		scanner := bufio.NewScanner(fh)
		throwaway := eObj.lineNumber - 5
		for throwaway > 0 && scanner.Scan() {
			throwaway--
		}

		for i := 0; i < 6; i++ {
			if scanner.Scan() {
				b := scanner.Bytes()
				if len(b) != 0 {
					fmt.Printf("%s\n", b)
				} else {
					i--
				}
			}
		}

		fh.Close()
	}
}