/*
 * Copyright 2015-2016 IBM Corporation
 *
 * 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 whisk

import (
    "fmt"
    "net/http"
    "errors"
    "net/url"
    "../wski18n"
)

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
}

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

////////////////////
// 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, EXITCODE_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, EXITCODE_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, EXITCODE_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, EXITCODE_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, EXITCODE_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, EXITCODE_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
}