package stfe

import (
	"bytes"
	"fmt"
	"strconv"
	"testing"

	"net/http"
)

// TODO: TestNewAddEntryRequest
func TestNewAddEntryRequest(t *testing.T) {
}

func TestNewGetEntriesRequest(t *testing.T) {
	lp := makeTestLogParameters(t, nil)
	for _, table := range []struct {
		description string
		start       string
		end         string
		wantErr     bool
	}{
		{
			description: "bad request: start must be an integer",
			start:       "start",
			end:         "10",
			wantErr:     true,
		},
		{
			description: "bad request: end must be an integer",
			start:       "10",
			end:         "end",
			wantErr:     true,
		},
		{
			description: "bad request: start must not be negative",
			start:       "-1",
			end:         "10",
			wantErr:     true,
		},
		{
			description: "bad request: start must be larger than end",
			start:       "1",
			end:         "0",
			wantErr:     true,
		},
		{
			description: "ok request but bad response: expected truncated",
			start:       "0",
			end:         fmt.Sprintf("%d", testMaxRange),
		},
		{
			description: "ok request and response",
			start:       "0",
			end:         "0",
		},
		{
			description: "ok request and response",
			start:       "0",
			end:         fmt.Sprintf("%d", testMaxRange-1),
		},
	} {
		r, err := http.NewRequest("GET", "http://example.com/"+lp.Prefix+"/get-entries", nil)
		if err != nil {
			t.Fatalf("must make http request in test %q: %v", table.description, err)
		}
		q := r.URL.Query()
		q.Add("start", table.start)
		q.Add("end", table.end)
		r.URL.RawQuery = q.Encode()

		req, err := lp.newGetEntriesRequest(r)
		if got, want := err != nil, table.wantErr; got != want {
			t.Errorf("got error is %v but wanted %v in test %q: %v", got, want, table.description, err)
		}
		if err != nil {
			continue
		}

		if got, want := req.Start, mustParseInt64(t, table.start); got != want {
			t.Errorf("got start %d but wanted %d in test %q", got, want, table.description)
		}
		if got, want := req.End, min(mustParseInt64(t, table.end), req.Start+testMaxRange-1); got != want {
			t.Errorf("got end %d but wanted %d in test %q", got, want, table.description)
		}
	}
}

func TestNewGetProofByHashRequest(t *testing.T) {
	lp := makeTestLogParameters(t, nil)
	for _, table := range []struct {
		description string
		treeSize    string
		hash        string
		wantErr     bool
	}{
		{
			description: "bad request: tree size must be an integer",
			treeSize:    "treeSize",
			hash:        b64(testNodeHash),
			wantErr:     true,
		},
		{
			description: "bad request: tree size must be larger than zero",
			treeSize:    "0",
			hash:        b64(testNodeHash),
			wantErr:     true,
		},
		{
			description: "bad request: hash is not base64",
			treeSize:    "1",
			hash:        "<(^_^)>",
			wantErr:     true,
		},
		{
			description: "bad request: invalid node hash (too small)",
			treeSize:    "1",
			hash:        b64(testNodeHash[1:]),
			wantErr:     true,
		},
		{
			description: "bad request: invalid node hash (too large)",
			treeSize:    "1",
			hash:        b64(append(testNodeHash, byte(0))),
			wantErr:     true,
		},
		{
			description: "ok request",
			treeSize:    "1",
			hash:        b64(testNodeHash),
		},
	} {
		r, err := http.NewRequest("GET", "http://example.com/"+lp.Prefix+"/get-proof-by-hash", nil)
		if err != nil {
			t.Fatalf("must make http request in test %q: %v", table.description, err)
		}
		q := r.URL.Query()
		q.Add("tree_size", table.treeSize)
		q.Add("hash", table.hash)
		r.URL.RawQuery = q.Encode()

		req, err := lp.newGetProofByHashRequest(r)
		if got, want := err != nil, table.wantErr; got != want {
			t.Errorf("got error is %v but wanted %v in test %q: %v", got, want, table.description, err)
		}
		if err != nil {
			continue
		}

		if got, want := req.TreeSize, mustParseInt64(t, table.treeSize); got != want {
			t.Errorf("got treeSize %d but wanted %d in test %q", got, want, table.description)
		}
		if got, want := req.Hash, mustDeb64(t, table.hash); !bytes.Equal(got, want) {
			t.Errorf("got hash %X but wanted %X in test %q", got, want, table.description)
		}
	}
}

// TODO: TestNewGetConsistencyProofRequest
func TestNewGetConsistencyProofRequest(t *testing.T) {
}

// TODO: TestNewGetEntryResponse
func TestNewGetEntriesResponse(t *testing.T) {
}

// TODO: TestNewGetAnchorsResponse
func TestNewGetAnchorsResponse(t *testing.T) {
}

func mustParseInt64(t *testing.T, num string) int64 {
	n, err := strconv.ParseInt(num, 10, 64)
	if err != nil {
		t.Fatalf("must parse int: %v", err)
	}
	return n
}

func mustDeb64(t *testing.T, str string) []byte {
	b, err := deb64(str)
	if err != nil {
		t.Fatalf("must base64 decode: %v", err)
	}
	return b
}

func min(a, b int64) int64 {
	if a < b {
		return a
	}
	return b
}