// Copyright 2015 The go-python Authors.  All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

import (
	"bytes"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"reflect"
	"testing"
)

func TestBind(t *testing.T) {
	// mk && rm -rf toto $TMPDIR/gopy-* && gopy bind -output=./toto ./_examples/hi && (echo "=== testing..."; cd toto; cp ../_examples/hi/test.py .; python2 ./test.py && echo "[ok]" || echo "ERR")
	//

	workdir, err := ioutil.TempDir("", "gopy-")
	if err != nil {
		t.Fatalf("could not create workdir: %v\n", err)
	}
	err = os.MkdirAll(workdir, 0644)
	if err != nil {
		t.Fatalf("could not create workdir: %v\n", err)
	}
	defer os.RemoveAll(workdir)

	cmd := exec.Command("gopy", "bind", "-output="+workdir, "./_examples/hi")
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	err = cmd.Run()
	if err != nil {
		t.Fatalf("error running gopy-bind: %v\n", err)
	}

	cmd = exec.Command(
		"/bin/cp", "./_examples/hi/test.py",
		filepath.Join(workdir, "test.py"),
	)
	cmd.Stdin = os.Stdin
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	err = cmd.Run()
	if err != nil {
		t.Fatalf("error copying 'test.py': %v\n", err)
	}

	want := []byte(`hi from go
hello you from go
working...
worked for 2 hours
working...
working...
worked for 4 hours
--- doc(hi)...
package hi exposes a few Go functions to be wrapped and used from Python.

--- hi.GetUniverse(): 42
--- hi.GetVersion(): 0.1
--- hi.GetDebug(): False
--- hi.SetDebug(true)
--- hi.GetDebug(): True
--- hi.SetDebug(false)
--- hi.GetDebug(): False
--- hi.GetAnon(): hi.Person{Name="<nobody>", Age=1}
--- new anon: hi.Person{Name="you", Age=24}
--- hi.SetAnon(hi.NewPerson('you', 24))...
--- hi.GetAnon(): hi.Person{Name="you", Age=24}
--- doc(hi.Hi)...
Hi() 

Hi prints hi from Go

--- hi.Hi()...
--- doc(hi.Hello)...
Hello(str s) 

Hello prints a greeting from Go

--- hi.Hello('you')...
--- doc(hi.Add)...
Add(int i, int j) int

Add returns the sum of its arguments.

--- hi.Add(1, 41)...
42
--- hi.Concat('4', '2')...
42
--- doc(hi.Person):
Person is a simple struct

--- p = hi.Person()...
['Age', 'Greet', 'Name', 'Salary', 'String', 'Work', '__class__', '__delattr__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']
--- p: hi.Person{Name="", Age=0}
--- p.Name: 
--- p.Age: 0
--- doc(hi.Greet):
Greet() str

Greet sends greetings

--- p.Greet()...
Hello, I am 
--- p.String()...
hi.Person{Name="", Age=0}
--- doc(p):
Person is a simple struct

--- p.Name = "foo"...
--- p.Age = 42...
--- p.String()...
hi.Person{Name="foo", Age=42}
--- p.Age: 42
--- p.Name: foo
--- p.Work(2)...
--- p.Work(24)...
caught: can't work for 24 hours!
--- p.Salary(2): 20
--- p.Salary(24): caught: can't work for 24 hours!
caught: Person.__init__ takes no argument | err-type: <type 'exceptions.TypeError'>
--- hi.NewPerson('me', 666): hi.Person{Name="me", Age=666}
--- hi.NewPersonWithAge(666): hi.Person{Name="stranger", Age=666}
--- hi.NewActivePerson(4): hi.Person{Name="", Age=0}
--- c = hi.Couple()...
hi.Couple{P1=hi.Person{Name="", Age=0}, P2=hi.Person{Name="", Age=0}}
--- c.P1: hi.Person{Name="", Age=0}
--- c: hi.Couple{P1=hi.Person{Name="tom", Age=5}, P2=hi.Person{Name="bob", Age=2}}
--- c = hi.NewCouple(tom, bob)...
hi.Couple{P1=hi.Person{Name="tom", Age=50}, P2=hi.Person{Name="bob", Age=41}}
hi.Couple{P1=hi.Person{Name="mom", Age=50}, P2=hi.Person{Name="bob", Age=51}}
--- testing GC...
--- len(objs): 100000
--- len(vs): 100000
--- testing GC... [ok]
--- testing array...
arr: [2]int{1, 2}
len(arr): 2
arr[0]: 1
arr[1]: 2
arr[2]: caught: array index out of range
arr: [2]int{1, 42}
len(arr): 2
mem(arr): 2
--- testing slice...
slice: []int{1, 2}
len(slice): 2
slice[0]: 1
slice[1]: 2
slice[2]: caught: array index out of range
slice: []int{1, 42}
len(slice): 2
mem(slice): 2
`)
	buf := new(bytes.Buffer)
	cmd = exec.Command("python2", "./test.py")
	cmd.Dir = workdir
	cmd.Stdin = os.Stdin
	cmd.Stdout = buf
	cmd.Stderr = buf
	err = cmd.Run()
	if err != nil {
		t.Fatalf(
			"error running python module: %v\n%v\n", err,
			string(buf.Bytes()),
		)
	}

	if !reflect.DeepEqual(string(buf.Bytes()), string(want)) {
		t.Fatalf("error running python module:\nwant:\n%s\n\ngot:\n%s\n",
			string(want), string(buf.Bytes()),
		)
	}
}