// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 config

import (
	"encoding/json"
	"io/ioutil"
	"os"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"

	"github.com/apache/apisix-ingress-controller/pkg/types"
)

func TestNewConfigFromFile(t *testing.T) {
	cfg := &Config{
		LogLevel:        "warn",
		LogOutput:       "stdout",
		HTTPListen:      ":9090",
		EnableProfiling: true,
		Kubernetes: KubernetesConfig{
			ResyncInterval: types.TimeDuration{time.Hour},
			Kubeconfig:     "/path/to/foo/baz",
			AppNamespaces:  []string{""},
			ElectionID:     "my-election-id",
		},
		APISIX: APISIXConfig{
			BaseURL:  "http://127.0.0.1:8080/apisix",
			AdminKey: "123456",
		},
	}

	jsonData, err := json.Marshal(cfg)
	assert.Nil(t, err, "failed to marshal config to json: %s", err)

	tmpJSON, err := ioutil.TempFile("/tmp", "config-*.json")
	assert.Nil(t, err, "failed to create temporary json configuration file: ", err)
	defer os.Remove(tmpJSON.Name())

	_, err = tmpJSON.Write(jsonData)
	assert.Nil(t, err, "failed to write json data: ", err)
	tmpJSON.Close()

	newCfg, err := NewConfigFromFile(tmpJSON.Name())
	assert.Nil(t, err, "failed to new config from file: ", err)
	assert.Nil(t, newCfg.Validate(), "failed to validate config")

	assert.Equal(t, cfg, newCfg, "bad configuration")

	// We constrcuts yaml data manually instead of using yaml.Marshal since
	// types.TimeDuration doesn't have a `yaml:",inline"` tag, if we add it,
	// error ",inline needs a struct value field" will be reported.
	// I don't know why.
	yamlData := `
log_level: warn
log_output: stdout
http_listen: :9090
enable_profiling: true
kubernetes:
  kubeconfig: /path/to/foo/baz
  resync_interval: 1h0m0s
  election_id: my-election-id
apisix:
  base_url: http://127.0.0.1:8080/apisix
  admin_key: "123456"
`
	tmpYAML, err := ioutil.TempFile("/tmp", "config-*.yaml")
	assert.Nil(t, err, "failed to create temporary yaml configuration file: ", err)
	defer os.Remove(tmpYAML.Name())

	_, err = tmpYAML.Write([]byte(yamlData))
	assert.Nil(t, err, "failed to write yaml data: ", err)
	tmpYAML.Close()

	newCfg, err = NewConfigFromFile(tmpYAML.Name())
	assert.Nil(t, err, "failed to new config from file: ", err)
	assert.Nil(t, newCfg.Validate(), "failed to validate config")

	assert.Equal(t, cfg, newCfg, "bad configuration")
}

func TestConfigDefaultValue(t *testing.T) {
	yamlData := `
apisix:
  base_url: http://127.0.0.1:8080/apisix
`
	tmpYAML, err := ioutil.TempFile("/tmp", "config-*.yaml")
	assert.Nil(t, err, "failed to create temporary yaml configuration file: ", err)
	defer os.Remove(tmpYAML.Name())

	_, err = tmpYAML.Write([]byte(yamlData))
	assert.Nil(t, err, "failed to write yaml data: ", err)
	tmpYAML.Close()

	newCfg, err := NewConfigFromFile(tmpYAML.Name())
	assert.Nil(t, err, "failed to new config from file: ", err)
	assert.Nil(t, newCfg.Validate(), "failed to validate config")

	defaultCfg := NewDefaultConfig()
	defaultCfg.APISIX.BaseURL = "http://127.0.0.1:8080/apisix"

	assert.Equal(t, defaultCfg, newCfg, "bad configuration")
}

func TestConfigInvalidation(t *testing.T) {
	yamlData := ``
	tmpYAML, err := ioutil.TempFile("/tmp", "config-*.yaml")
	assert.Nil(t, err, "failed to create temporary yaml configuration file: ", err)
	defer os.Remove(tmpYAML.Name())

	_, err = tmpYAML.Write([]byte(yamlData))
	assert.Nil(t, err, "failed to write yaml data: ", err)
	tmpYAML.Close()

	newCfg, err := NewConfigFromFile(tmpYAML.Name())
	assert.Nil(t, err, "failed to new config from file: ", err)
	err = newCfg.Validate()
	assert.Equal(t, err.Error(), "apisix base url is required", "bad error: ", err)

	yamlData = `
kubernetes:
  resync_interval: 15s
apisix:
  base_url: http://127.0.0.1:1234/apisix
`
	tmpYAML, err = ioutil.TempFile("/tmp", "config-*.yaml")
	assert.Nil(t, err, "failed to create temporary yaml configuration file: ", err)
	defer os.Remove(tmpYAML.Name())

	_, err = tmpYAML.Write([]byte(yamlData))
	assert.Nil(t, err, "failed to write yaml data: ", err)
	tmpYAML.Close()

	newCfg, err = NewConfigFromFile(tmpYAML.Name())
	assert.Nil(t, err, "failed to new config from file: ", err)
	err = newCfg.Validate()
	assert.Equal(t, err.Error(), "controller resync interval too small", "bad error: ", err)
}