// Copyright 2015 Vadim Kravcenko
//
// 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 jenkins

import (
	"compress/gzip"
	"encoding/json"
	"github.com/asaskevich/govalidator"
	"io"
	"io/ioutil"
	"k8s.io/klog"
	"net/http"
	"net/url"
	"strconv"
	"strings"
	"time"
	"unicode/utf8"
)

func makeJson(data interface{}) string {
	str, err := json.Marshal(data)
	if err != nil {
		return ""
	}
	return string(json.RawMessage(str))
}

func Reverse(s string) string {
	size := len(s)
	buf := make([]byte, size)
	for start := 0; start < size; {
		r, n := utf8.DecodeRuneInString(s[start:])
		start += n
		utf8.EncodeRune(buf[size-start:], r)
	}
	return string(buf)
}

type JkError struct {
	Message string `json:"message"`
	Code    int    `json:"code"`
}

func (err *JkError) Error() string {
	return err.Message
}

// Decompress response.body of JenkinsAPIResponse
func getRespBody(resp *http.Response) ([]byte, error) {
	var reader io.ReadCloser
	if resp.Header.Get("Content-Encoding") == "gzip" {
		reader, _ = gzip.NewReader(resp.Body)
	} else {
		reader = resp.Body
	}
	resBody, err := ioutil.ReadAll(reader)
	if err != nil {
		klog.Error(err)
		return nil, err
	}
	return resBody, err

}

// parseJenkinsQuery Parse the special query of jenkins.
// ParseQuery in the standard library makes the query not re-encode
func parseJenkinsQuery(query string) (url.Values, error) {
	m := make(url.Values)
	err := error(nil)
	for query != "" {
		key := query
		if i := strings.IndexAny(key, "&"); i >= 0 {
			key, query = key[:i], key[i+1:]
		} else {
			query = ""
		}
		if key == "" {
			continue
		}
		value := ""
		if i := strings.Index(key, "="); i >= 0 {
			key, value = key[:i], key[i+1:]
		}
		key, err1 := url.QueryUnescape(key)
		if err1 != nil {
			if err == nil {
				err = err1
			}
			continue
		}
		value, err1 = url.QueryUnescape(value)
		if err1 != nil {
			if err == nil {
				err = err1
			}
			continue
		}
		m[key] = append(m[key], value)
	}
	return m, err
}

type JenkinsBlueTime time.Time

func (t *JenkinsBlueTime) UnmarshalJSON(b []byte) error {
	if b == nil || strings.Trim(string(b), "\"") == "null" {
		*t = JenkinsBlueTime(time.Time{})
		return nil
	}
	j, err := time.Parse("2006-01-02T15:04:05.000-0700", strings.Trim(string(b), "\""))

	if err != nil {
		return err
	}
	*t = JenkinsBlueTime(j)
	return nil
}

func (t JenkinsBlueTime) MarshalJSON() ([]byte, error) {
	return json.Marshal(time.Time(t))
}

func GetJenkinsStatusCode(jenkinsErr error) int {
	if code, err := strconv.Atoi(jenkinsErr.Error()); err == nil {
		message := http.StatusText(code)
		if !govalidator.IsNull(message) {
			return code
		}
	}
	if jErr, ok := jenkinsErr.(*ErrorResponse); ok {
		return jErr.Response.StatusCode
	}
	return http.StatusInternalServerError
}
