/*
Copyright 2021 The KubeVela Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package common

import (
	"context"
	"errors"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"os"
	"os/exec"
	"path/filepath"
	"testing"

	"cuelang.org/go/cue"
	"cuelang.org/go/cue/load"
	"github.com/crossplane/crossplane-runtime/pkg/test"
	"github.com/google/go-cmp/cmp"
	"github.com/stretchr/testify/assert"
)

var ResponseString = "Hello HTTP Get."

func TestInitBaseRestConfig(t *testing.T) {
	args, err := InitBaseRestConfig()
	assert.NotNil(t, t, args)
	assert.NoError(t, err)
}

func TestHTTPGet(t *testing.T) {
	type want struct {
		data   string
		errStr string
	}
	var ctx = context.Background()

	testServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintln(w, ResponseString)
	}))
	defer testServer.Close()

	cases := map[string]struct {
		reason string
		url    string
		want   want
	}{
		"normal case": {
			reason: "url is valid\n",
			url:    testServer.URL,
			want: want{
				data:   fmt.Sprintf("%s\n", ResponseString),
				errStr: "",
			},
		},
	}

	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			got, err := HTTPGet(ctx, tc.url)
			if tc.want.errStr != "" {
				if diff := cmp.Diff(tc.want.errStr, err.Error(), test.EquateErrors()); diff != "" {
					t.Errorf("\n%s\nHTTPGet(...): -want error, +got error:\n%s", tc.reason, diff)
				}
			}

			if diff := cmp.Diff(tc.want.data, string(got)); diff != "" {
				t.Errorf("\n%s\nHTTPGet(...): -want, +got:\n%s", tc.reason, diff)
			}
		})
	}

}

func TestGetCUEParameterValue(t *testing.T) {
	type want struct {
		err error
	}
	var validCueStr = `
parameter: {
	min: int
}
`

	var CueStrNotContainParameter = `
output: {
	min: int
}
`
	cases := map[string]struct {
		reason string
		cueStr string
		want   want
	}{
		"GetCUEParameterValue": {
			reason: "cue string is valid",
			cueStr: validCueStr,
			want: want{
				err: nil,
			},
		},
		"CUEStringNotContainParameter": {
			reason: "cue string doesn't contain Parameter",
			cueStr: CueStrNotContainParameter,
			want: want{
				err: fmt.Errorf("parameter not exist"),
			},
		},
	}

	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			_, err := GetCUEParameterValue(tc.cueStr)
			if tc.want.err != nil {
				if diff := cmp.Diff(tc.want.err, err, test.EquateErrors()); diff != "" {
					t.Errorf("\n%s\nGenOpenAPIFromFile(...): -want error, +got error:\n%s", tc.reason, diff)
				}
			}

		})
	}
}

func TestGetCUEParameterValue4RareCases(t *testing.T) {
	type want struct {
		errMsg string
	}

	var invalidCueStr = `
name
`
	cases := map[string]struct {
		reason string
		cueStr string
		want   want
	}{
		"CUEStringInvalid": {
			reason: "cue string is invalid",
			cueStr: invalidCueStr,
			want: want{
				errMsg: "reference \"name\" not found",
			},
		},
	}

	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			_, err := GetCUEParameterValue(tc.cueStr)
			if diff := cmp.Diff(tc.want.errMsg, err.Error(), test.EquateConditions()); diff != "" {
				t.Errorf("\n%s\nGenOpenAPIFromFile(...): -want error, +got error:\n%s", tc.reason, diff)
			}

		})
	}
}

func TestGenOpenAPI(t *testing.T) {
	type want struct {
		data []byte
		err  error
	}
	var dir = "testdata"
	var validCueFile = "workload1.cue"
	var validTargetSchema = "workload1.json"
	targetFile := filepath.Join(dir, validTargetSchema)
	expect, _ := ioutil.ReadFile(targetFile)

	normalWant := want{
		data: expect,
		err:  nil,
	}

	f := filepath.FromSlash(validCueFile)

	inst := cue.Build(load.Instances([]string{f}, &load.Config{
		Dir: dir,
	}))[0]

	cases := map[string]struct {
		reason       string
		fileDir      string
		fileName     string
		targetSchema string
		want         want
	}{
		"GenOpenAPI": {
			reason:       "generate OpenAPI schema",
			fileDir:      dir,
			fileName:     validCueFile,
			targetSchema: validTargetSchema,
			want:         normalWant,
		},
	}

	for name, tc := range cases {
		t.Run(name, func(t *testing.T) {
			got, err := GenOpenAPI(inst)
			if tc.want.err != nil {
				if diff := cmp.Diff(tc.want.err, errors.New(err.Error()), test.EquateErrors()); diff != "" {
					t.Errorf("\n%s\nGenOpenAPIFromFile(...): -want error, +got error:\n%s", tc.reason, diff)
				}
			}

			if diff := cmp.Diff(tc.want.data, got); diff != "" {
				t.Errorf("\n%s\nGenOpenAPIFromFile(...): -want, +got:\n%s", tc.reason, diff)
			}
		})
	}
}

func TestRealtimePrintCommandOutput(t *testing.T) {
	cmd := exec.Command("bash", "-c", "date")
	err := RealtimePrintCommandOutput(cmd, "")
	assert.NoError(t, err)
	cmd.Process.Kill()

	var logFile = "terraform.log"
	var hello = "Hello"
	cmd = exec.Command("bash", "-c", fmt.Sprintf("echo \"%s\"", hello))
	err = RealtimePrintCommandOutput(cmd, logFile)
	assert.NoError(t, err)

	data, _ := ioutil.ReadFile(logFile)
	assert.Contains(t, string(data), hello)
	os.Remove(logFile)
}