/*
 * 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 TriggerService struct {
    client *Client
}

type Trigger struct {
    Namespace       string          `json:"namespace,omitempty"`
    Name            string          `json:"name,omityempty"`
    Version         string          `json:"version,omitempty"`
    ActivationId    string          `json:"activationId,omitempty"`
    Annotations     KeyValueArr     `json:"annotations,omitempty"`
    Parameters      KeyValueArr     `json:"parameters,omitempty"`
    Limits          *Limits         `json:"limits,omitempty"`
    Publish         *bool           `json:"publish,omitempty"`
}

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

// Compare(sortable) compares trigger to sortable for the purpose of sorting.
// REQUIRED: sortable must also be of type Trigger.
// ***Method of type Sortable***
func(trigger Trigger) Compare(sortable Sortable) (bool) {
    // Sorts alphabetically by NAMESPACE -> TRIGGER_NAME
    triggerToCompare := sortable.(Trigger)
    var triggerString string
    var compareString string

    triggerString = strings.ToLower(fmt.Sprintf("%s%s",trigger.Namespace,
        trigger.Name))
    compareString = strings.ToLower(fmt.Sprintf("%s%s", triggerToCompare.Namespace,
        triggerToCompare.Name))

    return triggerString < compareString
}

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

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

    return fmt.Sprintf("%-70s %s\n", fmt.Sprintf("/%s/%s", trigger.Namespace,
        trigger.Name), publishState)
}

func (s *TriggerService) List(options *TriggerListOptions) ([]Trigger, *http.Response, error) {
    route := "triggers"
    routeUrl, err := addRouteOptions(route, options)
    if err != nil {
        Debug(DbgError, "addRouteOptions(%s, %#v) error: '%s'\n", route, options, err)
        errStr := wski18n.T("Unable to append options '{{.options}}' to URL route '{{.route}}': {{.err}}",
            map[string]interface{}{"options": fmt.Sprintf("%#v", options), "route": route, "err": err})
        werr := MakeWskError(errors.New(errStr), EXIT_CODE_ERR_GENERAL, DISPLAY_MSG, NO_DISPLAY_USAGE)
        return nil, nil, werr
    }

    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", route, err)
        errStr := wski18n.T("Unable to create HTTP request for GET '{{.route}}': {{.err}}",
            map[string]interface{}{"route": route, "err": err})
        werr := MakeWskErrorFromWskError(errors.New(errStr), err, EXIT_CODE_ERR_GENERAL, DISPLAY_MSG, NO_DISPLAY_USAGE)
        return nil, nil, werr
    }

    var triggers []Trigger
    resp, err := s.client.Do(req, &triggers, 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 triggers, resp, nil
}

func (s *TriggerService) Insert(trigger *Trigger, overwrite bool) (*Trigger, *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
    triggerName := (&url.URL{Path:  trigger.Name}).String()
    route := fmt.Sprintf("triggers/%s?overwrite=%t", triggerName, overwrite)

    routeUrl, err := url.Parse(route)
    if err != nil {
        Debug(DbgError, "url.Parse(%s) error: %s\n", route, err)
        errStr := wski18n.T("Invalid request URL '{{.url}}': {{.err}}",
            map[string]interface{}{"url": route, "err": err})
        werr := MakeWskError(errors.New(errStr), EXIT_CODE_ERR_GENERAL, DISPLAY_MSG, NO_DISPLAY_USAGE)
        return nil, nil, werr
    }

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

    t := new(Trigger)
    resp, err := s.client.Do(req, &t, 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 t, resp, nil

}

func (s *TriggerService) Get(triggerName string) (*Trigger, *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
    triggerName = (&url.URL{Path: triggerName}).String()
    route := fmt.Sprintf("triggers/%s", triggerName)

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

    t := new(Trigger)
    resp, err := s.client.Do(req, &t, 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 t, resp, nil

}

func (s *TriggerService) Delete(triggerName string) (*Trigger, *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
    triggerName = (&url.URL{Path: triggerName}).String()
    route := fmt.Sprintf("triggers/%s", triggerName)

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

    t := new(Trigger)
    resp, err := s.client.Do(req, &t, 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 t, resp, nil
}

func (s *TriggerService) Fire(triggerName string, payload interface{}) (*Trigger, *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
    triggerName = (&url.URL{Path: triggerName}).String()
    route := fmt.Sprintf("triggers/%s", triggerName)

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

    t := new(Trigger)
    resp, err := s.client.Do(req, &t, 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 t, resp, nil
}