package client

import (
	"encoding/json"
	"path/filepath"
	"testing"

	. "gopkg.in/check.v1"
	"os"
)

type LocalStoreSuite struct{}

var _ = Suite(&LocalStoreSuite{})

// Hook up gocheck into the "go test" runner.
func Test(t *testing.T) { TestingT(t) }

func (LocalStoreSuite) TestFileLocalStore(c *C) {
	tmp := c.MkDir()
	path := filepath.Join(tmp, "tuf.db")
	store, err := FileLocalStore(path)
	c.Assert(err, IsNil)
	defer store.Close()

	type meta map[string]json.RawMessage

	assertGet := func(expected meta) {
		actual, err := store.GetMeta()
		c.Assert(err, IsNil)
		c.Assert(meta(actual), DeepEquals, expected)
	}

	// initial GetMeta should return empty meta
	assertGet(meta{})

	// SetMeta should persist
	rootJSON := []byte(`{"_type":"Root"}`)
	c.Assert(store.SetMeta("root.json", rootJSON), IsNil)
	assertGet(meta{"root.json": rootJSON})

	// SetMeta should add to existing meta
	targetsJSON := []byte(`{"_type":"Target"}`)
	c.Assert(store.SetMeta("targets.json", targetsJSON), IsNil)
	assertGet(meta{"root.json": rootJSON, "targets.json": targetsJSON})

	// a new store should get the same meta
	c.Assert(store.Close(), IsNil)
	store, err = FileLocalStore(path)
	c.Assert(err, IsNil)
	defer func() {
		c.Assert(store.Close(), IsNil)
	}()
	assertGet(meta{"root.json": rootJSON, "targets.json": targetsJSON})
}

func (LocalStoreSuite) TestDeleteMeta(c *C) {
	tmp := c.MkDir()
	path := filepath.Join(tmp, "tuf.db")
	store, err := FileLocalStore(path)
	c.Assert(err, IsNil)

	type meta map[string]json.RawMessage

	assertGet := func(expected meta) {
		actual, err := store.GetMeta()
		c.Assert(err, IsNil)
		c.Assert(meta(actual), DeepEquals, expected)
	}

	// initial GetMeta should return empty meta
	assertGet(meta{})

	// SetMeta should persist
	rootJSON := []byte(`{"_type":"Root"}`)
	c.Assert(store.SetMeta("root.json", rootJSON), IsNil)
	assertGet(meta{"root.json": rootJSON})

	store.DeleteMeta("root.json")
	m, _ := store.GetMeta()
	if _, ok := m["root.json"]; ok {
		c.Fatalf("Metadata is not deleted!")
	}
}

func (LocalStoreSuite) TestCorruptManifest(c *C) {
	tmp := c.MkDir()
	path := filepath.Join(tmp, "tuf.db")

	store, err := FileLocalStore(path)
	c.Assert(err, IsNil)

	// now break the manifest file
	err = os.Truncate(filepath.Join(path, "MANIFEST-000000"), 1)
	c.Assert(err, IsNil)
	err = store.Close()
	c.Assert(err, IsNil)

	store, err = FileLocalStore(path)
	c.Assert(err, IsNil)

	type meta map[string]json.RawMessage

	assertGet := func(expected meta) {
		actual, err := store.GetMeta()
		c.Assert(err, IsNil)
		c.Assert(meta(actual), DeepEquals, expected)
	}

	// initial GetMeta should return empty meta
	assertGet(meta{})

	// SetMeta should persist
	rootJSON := []byte(`{"_type":"Root"}`)
	c.Assert(store.SetMeta("root.json", rootJSON), IsNil)
	assertGet(meta{"root.json": rootJSON})

	store.DeleteMeta("root.json")
	m, _ := store.GetMeta()
	if _, ok := m["root.json"]; ok {
		c.Fatalf("Metadata is not deleted!")
	}
}