// Mgmt
// Copyright (C) 2013-2017+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package pgraph

import (
	"fmt"
	"testing"
)

// TODO: unify with the other function like this...
// TODO: where should we put our test helpers?
func runGraphCmp(t *testing.T, g1, g2 *Graph) {
	err := g1.GraphCmp(g2, vertexCmpFn, edgeCmpFn)
	if err != nil {
		t.Logf("  actual (g1): %v%v", g1, fullPrint(g1))
		t.Logf("expected (g2): %v%v", g2, fullPrint(g2))
		t.Logf("Cmp error:")
		t.Errorf("%v", err)
	}
}

// TODO: unify with the other function like this...
func fullPrint(g *Graph) (str string) {
	str += "\n"
	for v := range g.Adjacency() {
		str += fmt.Sprintf("* v: %s\n", v)
	}
	for v1 := range g.Adjacency() {
		for v2, e := range g.Adjacency()[v1] {
			str += fmt.Sprintf("* e: %s -> %s # %s\n", v1, v2, e)
		}
	}
	return
}

// edgeGenFn generates unique edges for each vertex pair, assuming unique
// vertices.
func edgeGenFn(v1, v2 Vertex) Edge {
	return NE(fmt.Sprintf("%s,%s", v1, v2))
}

func TestPgraphAddEdgeGraph1(t *testing.T) {
	v1 := NV("v1")
	v2 := NV("v2")
	v3 := NV("v3")
	v4 := NV("v4")
	v5 := NV("v5")
	e1 := NE("e1")
	e2 := NE("e2")
	e3 := NE("e3")

	g := &Graph{}
	g.AddEdge(v1, v3, e1)
	g.AddEdge(v2, v3, e2)

	sub := &Graph{}
	sub.AddEdge(v4, v5, e3)

	g.AddGraph(sub)

	// expected (can re-use the same vertices)
	expected := &Graph{}
	expected.AddEdge(v1, v3, e1)
	expected.AddEdge(v2, v3, e2)
	expected.AddEdge(v4, v5, e3)

	//expected.AddEdge(v3, v4, NE("v3,v4"))
	//expected.AddEdge(v3, v5, NE("v3,v5"))

	runGraphCmp(t, g, expected)
}

func TestPgraphAddEdgeVertexGraph1(t *testing.T) {
	v1 := NV("v1")
	v2 := NV("v2")
	v3 := NV("v3")
	v4 := NV("v4")
	v5 := NV("v5")
	e1 := NE("e1")
	e2 := NE("e2")
	e3 := NE("e3")

	g := &Graph{}
	g.AddEdge(v1, v3, e1)
	g.AddEdge(v2, v3, e2)

	sub := &Graph{}
	sub.AddEdge(v4, v5, e3)

	g.AddEdgeVertexGraph(v3, sub, edgeGenFn)

	// expected (can re-use the same vertices)
	expected := &Graph{}
	expected.AddEdge(v1, v3, e1)
	expected.AddEdge(v2, v3, e2)
	expected.AddEdge(v4, v5, e3)

	expected.AddEdge(v3, v4, NE("v3,v4"))
	expected.AddEdge(v3, v5, NE("v3,v5"))

	runGraphCmp(t, g, expected)
}

func TestPgraphAddEdgeGraphVertex1(t *testing.T) {
	v1 := NV("v1")
	v2 := NV("v2")
	v3 := NV("v3")
	v4 := NV("v4")
	v5 := NV("v5")
	e1 := NE("e1")
	e2 := NE("e2")
	e3 := NE("e3")

	g := &Graph{}
	g.AddEdge(v1, v3, e1)
	g.AddEdge(v2, v3, e2)

	sub := &Graph{}
	sub.AddEdge(v4, v5, e3)

	g.AddEdgeGraphVertex(sub, v3, edgeGenFn)

	// expected (can re-use the same vertices)
	expected := &Graph{}
	expected.AddEdge(v1, v3, e1)
	expected.AddEdge(v2, v3, e2)
	expected.AddEdge(v4, v5, e3)

	expected.AddEdge(v4, v3, NE("v4,v3"))
	expected.AddEdge(v5, v3, NE("v5,v3"))

	runGraphCmp(t, g, expected)
}

func TestPgraphAddEdgeVertexGraphLight1(t *testing.T) {
	v1 := NV("v1")
	v2 := NV("v2")
	v3 := NV("v3")
	v4 := NV("v4")
	v5 := NV("v5")
	e1 := NE("e1")
	e2 := NE("e2")
	e3 := NE("e3")

	g := &Graph{}
	g.AddEdge(v1, v3, e1)
	g.AddEdge(v2, v3, e2)

	sub := &Graph{}
	sub.AddEdge(v4, v5, e3)

	g.AddEdgeVertexGraphLight(v3, sub, edgeGenFn)

	// expected (can re-use the same vertices)
	expected := &Graph{}
	expected.AddEdge(v1, v3, e1)
	expected.AddEdge(v2, v3, e2)
	expected.AddEdge(v4, v5, e3)

	expected.AddEdge(v3, v4, NE("v3,v4"))
	//expected.AddEdge(v3, v5, NE("v3,v5")) // not needed with light

	runGraphCmp(t, g, expected)
}

func TestPgraphAddEdgeGraphVertexLight1(t *testing.T) {
	v1 := NV("v1")
	v2 := NV("v2")
	v3 := NV("v3")
	v4 := NV("v4")
	v5 := NV("v5")
	e1 := NE("e1")
	e2 := NE("e2")
	e3 := NE("e3")

	g := &Graph{}
	g.AddEdge(v1, v3, e1)
	g.AddEdge(v2, v3, e2)

	sub := &Graph{}
	sub.AddEdge(v4, v5, e3)

	g.AddEdgeGraphVertexLight(sub, v3, edgeGenFn)

	// expected (can re-use the same vertices)
	expected := &Graph{}
	expected.AddEdge(v1, v3, e1)
	expected.AddEdge(v2, v3, e2)
	expected.AddEdge(v4, v5, e3)

	//expected.AddEdge(v4, v3, NE("v4,v3")) // not needed with light
	expected.AddEdge(v5, v3, NE("v5,v3"))

	runGraphCmp(t, g, expected)
}