/*
 * 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 whisk

import (
    "fmt"
    "net/http"
    "errors"
    "net/url"
    "github.com/apache/incubator-openwhisk-client-go/wski18n"
    "strings"
)

type ActionService struct {
    client *Client
}

type Action struct {
    Namespace   string      `json:"namespace,omitempty"`
    Name        string      `json:"name,omitempty"`
    Version     string      `json:"version,omitempty"`
    Exec        *Exec       `json:"exec,omitempty"`
    Annotations KeyValueArr `json:"annotations,omitempty"`
    Parameters  KeyValueArr `json:"parameters,omitempty"`
    Limits      *Limits     `json:"limits,omitempty"`
    Error       string      `json:"error,omitempty"`
    Code        int         `json:"code,omitempty"`
    Publish     *bool       `json:"publish,omitempty"`
}

type Exec struct {
    Kind        string      `json:"kind,omitempty"`
    Code        *string     `json:"code,omitempty"`
    Image       string      `json:"image,omitempty"`
    Init        string      `json:"init,omitempty"`
    Main        string      `json:"main,omitempty"`
    Components  []string    `json:"components,omitempty"`    // List of fully qualified actions
    Binary      *bool       `json:"binary,omitempty"`
}

type ActionListOptions struct {
    Limit       int         `url:"limit"`
    Skip        int         `url:"skip"`
    Docs        bool        `url:"docs,omitempty"`
}

// Compare(sortable) compares action to sortable for the purpose of sorting.
// REQUIRED: sortable must also be of type Action.
// ***Method of type Sortable***
func(action Action) Compare(sortable Sortable) (bool) {
    // Sorts alphabetically by NAMESPACE -> PACKAGE_NAME -> ACTION_NAME, with
    //    actions under default package at the top.
    var actionString string
    var compareString string
    actionToCompare := sortable.(Action)

    actionString = strings.ToLower(fmt.Sprintf("%s%s", action.Namespace, action.Name))
    compareString = strings.ToLower(fmt.Sprintf("%s%s", actionToCompare.Namespace,
    actionToCompare.Name))
    if strings.Contains(action.Namespace, "/") && !strings.Contains(actionToCompare.Namespace, "/") {
        return false
    } else if !strings.Contains(action.Namespace, "/") && strings.Contains(actionToCompare.Namespace, "/") {
        return true
    } else if strings.Contains(action.Namespace, "/") && strings.Contains(actionToCompare.Namespace, "/") {
        return actionString < compareString
    } else {
        return action.Name < actionToCompare.Name
    }
}

// ToHeaderString() returns the header for a list of actions
func(action Action) ToHeaderString() string {
    return fmt.Sprintf("%s\n", "actions")
}

// ToSummaryRowString() returns a compound string of required parameters for printing
//   from CLI command `wsk action list`.
// ***Method of type Sortable***
func(action Action) ToSummaryRowString() string{
    var kind string
    publishState := wski18n.T("private")

    for i := range action.Annotations {
        if (action.Annotations[i].Key == "exec") {
            kind = action.Annotations[i].Value.(string)
            break
        }
    }
    return fmt.Sprintf("%-70s %s %s\n", fmt.Sprintf("/%s/%s", action.Namespace, action.Name), publishState, kind)
}

/*
Determines if an action is a web action by examining the action's annotations. A value of true is returned if the
action's annotations contains a "web-export" key and its associated value is a boolean value of "true". Otherwise, false
is returned.
 */
func (action Action) WebAction() (webExportValue bool) {
    webExport := action.Annotations.GetValue("web-export")
    webExportValue, _ = webExport.(bool)

    Debug(DbgInfo, "Web export value is '%t'\n", webExportValue)

    return webExportValue
}

/*
Returns the URL of an action as a string. A valid API host, path and version must be passed. A package that contains the
action must be passed as well. An empty string must be passed if the action is not packaged.
 */
func (action Action) ActionURL(apiHost string, apiPath string, apiVersion string, pkg string) (string, error) {
    baseURL, err := GetURLBase(apiHost, apiPath)
    if err != nil {
        Debug(DbgError, "GetURLBase(%s, %s) failed: %s\n", apiHost, apiPath, err)
        return "", err
    }
    webActionPath := "%s/%s/web/%s/%s/%s"
    actionPath := "%s/%s/namespaces/%s/actions/%s"
    packagedActionPath := actionPath + "/%s"
    namespace := strings.Split(action.Namespace, "/")[0]
    namespace = strings.Replace(url.QueryEscape(namespace), "+", "%20", -1)
    name := strings.Replace(url.QueryEscape(action.Name), "+", "%20", -1)
    pkg = strings.Replace(url.QueryEscape(pkg), "+", "%20", -1)

    var actionURL string
    if action.WebAction() {
        if len(pkg) == 0 {
            pkg = "default"
        }

        actionURL = fmt.Sprintf(webActionPath, baseURL, apiVersion, namespace, pkg, name)
        Debug(DbgInfo, "Web action URL: %s\n", actionURL)
    } else {
        if len(pkg) == 0 {
            actionURL = fmt.Sprintf(actionPath, baseURL, apiVersion, namespace, name)
            Debug(DbgInfo, "Packaged action URL: %s\n", actionURL)
        } else {
            actionURL = fmt.Sprintf(packagedActionPath, baseURL, apiVersion, namespace, pkg, name)
            Debug(DbgInfo, "Action URL: %s\n", actionURL)
        }
    }

    return actionURL, nil
}

////////////////////
// Action Methods //
////////////////////

func (s *ActionService) List(packageName string, options *ActionListOptions) ([]Action, *http.Response, error) {
    var route string
    var actions []Action

    if (len(packageName) > 0) {
        // Encode resource name as a path (with no query params) before inserting it into the URI
        // This way any '?' chars in the name won't be treated as the beginning of the query params
        packageName = (&url.URL{Path:  packageName}).String()
        route = fmt.Sprintf("actions/%s/", packageName)
    } else {
        route = fmt.Sprintf("actions")
    }

    routeUrl, err := addRouteOptions(route, options)
    if err != nil {
        Debug(DbgError, "addRouteOptions(%s, %#v) error: '%s'\n", route, options, err)
        errMsg := wski18n.T("Unable to add route options '{{.options}}'",
            map[string]interface{}{"options": options})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_GENERAL, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, nil, whiskErr
    }
    Debug(DbgError, "Action list route with options: %s\n", route)

    req, err := s.client.NewRequestUrl("GET", routeUrl, nil, IncludeNamespaceInUrl, AppendOpenWhiskPathPrefix, EncodeBodyAsJson, AuthRequired)
    if err != nil {
        Debug(DbgError, "http.NewRequestUrl(GET, %s, nil, IncludeNamespaceInUrl, AppendOpenWhiskPathPrefix, EncodeBodyAsJson, AuthRequired) error: '%s'\n", routeUrl, err)
        errMsg := wski18n.T("Unable to create HTTP request for GET '{{.route}}': {{.err}}",
            map[string]interface{}{"route": routeUrl, "err": err})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_NETWORK, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, nil, whiskErr
    }

    resp, err := s.client.Do(req, &actions, ExitWithSuccessOnTimeout)
    if err != nil {
        Debug(DbgError, "s.client.Do() error - HTTP req %s; error '%s'\n", req.URL.String(), err)
        return nil, resp, err
    }

    return actions, resp, err
}

func (s *ActionService) Insert(action *Action, overwrite bool) (*Action, *http.Response, error) {
    // Encode resource name as a path (with no query params) before inserting it into the URI
    // This way any '?' chars in the name won't be treated as the beginning of the query params
    actionName := (&url.URL{Path:  action.Name}).String()
    route := fmt.Sprintf("actions/%s?overwrite=%t", actionName, overwrite)
    Debug(DbgInfo, "Action insert route: %s\n", route)

    req, err := s.client.NewRequest("PUT", route, action, IncludeNamespaceInUrl)
    if err != nil {
        Debug(DbgError, "http.NewRequest(PUT, %s, %#v) error: '%s'\n", route, err, action)
        errMsg := wski18n.T("Unable to create HTTP request for PUT '{{.route}}': {{.err}}",
            map[string]interface{}{"route": route, "err": err})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_NETWORK, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, nil, whiskErr
    }

    a := new(Action)
    resp, err := s.client.Do(req, &a, ExitWithSuccessOnTimeout)
    if err != nil {
        Debug(DbgError, "s.client.Do() error - HTTP req %s; error '%s'\n", req.URL.String(), err)
        return nil, resp, err
    }

    return a, resp, nil
}

func (s *ActionService) Get(actionName string) (*Action, *http.Response, error) {
    // Encode resource name as a path (with no query params) before inserting it into the URI
    // This way any '?' chars in the name won't be treated as the beginning of the query params
    actionName = (&url.URL{Path: actionName}).String()
    route := fmt.Sprintf("actions/%s", actionName)

    req, err := s.client.NewRequest("GET", route, nil, IncludeNamespaceInUrl)
    if err != nil {
        Debug(DbgError, "http.NewRequest(GET, %s, nil) error: '%s'\n", route, err)
        errMsg := wski18n.T("Unable to create HTTP request for GET '{{.route}}': {{.err}}",
            map[string]interface{}{"route": route, "err": err})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_NETWORK, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, nil, whiskErr
    }

    a := new(Action)
    resp, err := s.client.Do(req, &a, ExitWithSuccessOnTimeout)
    if err != nil {
        Debug(DbgError, "s.client.Do() error - HTTP req %s; error '%s'\n", req.URL.String(), err)
        return nil, resp, err
    }

    return a, resp, nil
}

func (s *ActionService) Delete(actionName string) (*http.Response, error) {
    // Encode resource name as a path (with no query params) before inserting it into the URI
    // This way any '?' chars in the name won't be treated as the beginning of the query params
    actionName = (&url.URL{Path: actionName}).String()
    route := fmt.Sprintf("actions/%s", actionName)
    Debug(DbgInfo, "HTTP route: %s\n", route)

    req, err := s.client.NewRequest("DELETE", route, nil, IncludeNamespaceInUrl)
    if err != nil {
        Debug(DbgError, "http.NewRequest(DELETE, %s, nil) error: '%s'\n", route, err)
        errMsg := wski18n.T("Unable to create HTTP request for DELETE '{{.route}}': {{.err}}",
            map[string]interface{}{"route": route, "err": err})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_NETWORK, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, whiskErr
    }

    a := new(Action)
    resp, err := s.client.Do(req, a, ExitWithSuccessOnTimeout)
    if err != nil {
        Debug(DbgError, "s.client.Do() error - HTTP req %s; error '%s'\n", req.URL.String(), err)
        return resp, err
    }

    return resp, nil
}

func (s *ActionService) Invoke(actionName string, payload interface{}, blocking bool, result bool) (map[string]interface {}, *http.Response, error) {
    var res map[string]interface {}

    // Encode resource name as a path (with no query params) before inserting it into the URI
    // This way any '?' chars in the name won't be treated as the beginning of the query params
    actionName = (&url.URL{Path: actionName}).String()
    route := fmt.Sprintf("actions/%s?blocking=%t&result=%t", actionName, blocking, result)
    Debug(DbgInfo, "HTTP route: %s\n", route)

    req, err := s.client.NewRequest("POST", route, payload, IncludeNamespaceInUrl)
    if err != nil {
        Debug(DbgError, "http.NewRequest(POST, %s, %#v) error: '%s'\n", route, payload, err)
        errMsg := wski18n.T("Unable to create HTTP request for POST '{{.route}}': {{.err}}",
            map[string]interface{}{"route": route, "err": err})
        whiskErr := MakeWskErrorFromWskError(errors.New(errMsg), err, EXIT_CODE_ERR_NETWORK, DISPLAY_MSG,
            NO_DISPLAY_USAGE)
        return nil, nil, whiskErr
    }

    resp, err := s.client.Do(req, &res, blocking)

    if err != nil {
      Debug(DbgError, "s.client.Do() error - HTTP req %s; error '%s'\n", req.URL.String(), err)
      return res, resp, err
    }

    return res, resp, nil
}