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// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package main

import (
    "context"
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
    "net/http/httptest"
    "net/url"
    "testing"
    "time"

    "github.com/dexon-foundation/dexon/p2p/enode"
    "github.com/dexon-foundation/dexon/p2p/simulations"
    "github.com/dexon-foundation/dexon/swarm/log"
)

var (
    nodeCount = 10
)

//This test is used to test the overlay simulation.
//As the simulation is executed via a main, it is easily missed on changes
//An automated test will prevent that
//The test just connects to the simulations, starts the network,
//starts the mocker, gets the number of nodes, and stops it again.
//It also provides a documentation on the steps needed by frontends
//to use the simulations
func TestOverlaySim(t *testing.T) {
    t.Skip("Test is flaky, see: https://github.com/ethersphere/go-ethereum/issues/592")
    //start the simulation
    log.Info("Start simulation backend")
    //get the simulation networ; needed to subscribe for up events
    net := newSimulationNetwork()
    //create the overlay simulation
    sim := newOverlaySim(net)
    //create a http test server with it
    srv := httptest.NewServer(sim)
    defer srv.Close()

    log.Debug("Http simulation server started. Start simulation network")
    //start the simulation network (initialization of simulation)
    resp, err := http.Post(srv.URL+"/start", "application/json", nil)
    if err != nil {
        t.Fatal(err)
    }
    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        t.Fatalf("Expected Status Code %d, got %d", http.StatusOK, resp.StatusCode)
    }

    log.Debug("Start mocker")
    //start the mocker, needs a node count and an ID
    resp, err = http.PostForm(srv.URL+"/mocker/start",
        url.Values{
            "node-count":  {fmt.Sprintf("%d", nodeCount)},
            "mocker-type": {simulations.GetMockerList()[0]},
        })
    if err != nil {
        t.Fatal(err)
    }
    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        reason, err := ioutil.ReadAll(resp.Body)
        if err != nil {
            t.Fatal(err)
        }
        t.Fatalf("Expected Status Code %d, got %d, response body %s", http.StatusOK, resp.StatusCode, string(reason))
    }

    //variables needed to wait for nodes being up
    var upCount int
    trigger := make(chan enode.ID)

    //wait for all nodes to be up
    ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
    defer cancel()

    //start watching node up events...
    go watchSimEvents(net, ctx, trigger)

    //...and wait until all expected up events (nodeCount) have been received
LOOP:
    for {
        select {
        case <-trigger:
            //new node up event received, increase counter
            upCount++
            //all expected node up events received
            if upCount == nodeCount {
                break LOOP
            }
        case <-ctx.Done():
            t.Fatalf("Timed out waiting for up events")
        }

    }

    //at this point we can query the server
    log.Info("Get number of nodes")
    //get the number of nodes
    resp, err = http.Get(srv.URL + "/nodes")
    if err != nil {
        t.Fatal(err)
    }

    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        t.Fatalf("err %s", resp.Status)
    }
    b, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        t.Fatal(err)
    }

    //unmarshal number of nodes from JSON response
    var nodesArr []simulations.Node
    err = json.Unmarshal(b, &nodesArr)
    if err != nil {
        t.Fatal(err)
    }

    //check if number of nodes received is same as sent
    if len(nodesArr) != nodeCount {
        t.Fatal(fmt.Errorf("Expected %d number of nodes, got %d", nodeCount, len(nodesArr)))
    }

    //need to let it run for a little while, otherwise stopping it immediately can crash due running nodes
    //wanting to connect to already stopped nodes
    time.Sleep(1 * time.Second)

    log.Info("Stop the network")
    //stop the network
    resp, err = http.Post(srv.URL+"/stop", "application/json", nil)
    if err != nil {
        t.Fatal(err)
    }
    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        t.Fatalf("err %s", resp.Status)
    }

    log.Info("Reset the network")
    //reset the network (removes all nodes and connections)
    resp, err = http.Post(srv.URL+"/reset", "application/json", nil)
    if err != nil {
        t.Fatal(err)
    }
    defer resp.Body.Close()
    if resp.StatusCode != http.StatusOK {
        t.Fatalf("err %s", resp.Status)
    }
}

//watch for events so we know when all nodes are up
func watchSimEvents(net *simulations.Network, ctx context.Context, trigger chan enode.ID) {
    events := make(chan *simulations.Event)
    sub := net.Events().Subscribe(events)
    defer sub.Unsubscribe()

    for {
        select {
        case ev := <-events:
            //only catch node up events
            if ev.Type == simulations.EventTypeNode {
                if ev.Node.Up() {
                    log.Debug("got node up event", "event", ev, "node", ev.Node.Config.ID)
                    select {
                    case trigger <- ev.Node.Config.ID:
                    case <-ctx.Done():
                        return
                    }
                }
            }
        case <-ctx.Done():
            return
        }
    }
}