package pilosa_test

import (
	"io/ioutil"
	"os"
	"testing"

	"github.com/pilosa/pilosa"
)

// Ensure frame can open and retrieve a fragment.
func TestFrame_CreateFragmentIfNotExists(t *testing.T) {
	f := MustOpenFrame()
	defer f.Close()

	// Create fragment.
	frag, err := f.CreateFragmentIfNotExists(100)
	if err != nil {
		t.Fatal(err)
	} else if frag == nil {
		t.Fatal("expected fragment")
	}

	// Retrieve existing fragment.
	frag2, err := f.CreateFragmentIfNotExists(100)
	if err != nil {
		t.Fatal(err)
	} else if frag != frag2 {
		t.Fatal("fragment mismatch")
	}

	if frag != f.Fragment(100) {
		t.Fatal("fragment mismatch")
	}
}

// Ensure frame can set its time quantum.
func TestFrame_SetTimeQuantum(t *testing.T) {
	f := MustOpenFrame()
	defer f.Close()

	// Set & retrieve time quantum.
	if err := f.SetTimeQuantum(pilosa.TimeQuantum("YMDH")); err != nil {
		t.Fatal(err)
	} else if q := f.TimeQuantum(); q != pilosa.TimeQuantum("YMDH") {
		t.Fatalf("unexpected quantum: %s", q)
	}

	// Reload frame and verify that it is persisted.
	if err := f.Reopen(); err != nil {
		t.Fatal(err)
	} else if q := f.TimeQuantum(); q != pilosa.TimeQuantum("YMDH") {
		t.Fatalf("unexpected quantum (reopen): %s", q)
	}
}

// Frame represents a test wrapper for pilosa.Frame.
type Frame struct {
	*pilosa.Frame
}

// NewFrame returns a new instance of Frame d/0.
func NewFrame() *Frame {
	path, err := ioutil.TempDir("", "pilosa-frame-")
	if err != nil {
		panic(err)
	}

	return &Frame{Frame: pilosa.NewFrame(path, "d", "f")}
}

// MustOpenFrame returns a new, opened frame at a temporary path. Panic on error.
func MustOpenFrame() *Frame {
	f := NewFrame()
	if err := f.Open(); err != nil {
		panic(err)
	}
	return f
}

// Close closes the frame and removes the underlying data.
func (f *Frame) Close() error {
	defer os.RemoveAll(f.Path())
	return f.Frame.Close()
}

// Reopen closes the database and reopens it.
func (f *Frame) Reopen() error {
	if err := f.Frame.Close(); err != nil {
		return err
	}

	path, db, name := f.Path(), f.DB(), f.Name()
	f.Frame = pilosa.NewFrame(path, db, name)

	if err := f.Open(); err != nil {
		return err
	}
	return nil
}