// 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"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"strings"
	"time"
	"unicode/utf8"

	"k8s.io/klog"
)

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) (result url.Values, err error) {
	result = make(url.Values)
	for query != "" && err == nil {
		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:]
		}
		if key, err = url.QueryUnescape(key); err == nil {
			if value, err = url.QueryUnescape(value); err == nil {
				result[key] = append(result[key], value)
			}
		}
	}
	return
}

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))
}