package engine

import (
	"fmt"
	"sync"
	"testing"

	"k8s.io/helm/pkg/chartutil"
	"k8s.io/helm/pkg/proto/hapi/chart"
)

func TestEngine(t *testing.T) {
	e := New()

	// Forbidden because they allow access to the host OS.
	forbidden := []string{"env", "expandenv"}
	for _, f := range forbidden {
		if _, ok := e.FuncMap[f]; ok {
			t.Errorf("Forbidden function %s exists in FuncMap.", f)
		}
	}
}

func TestRender(t *testing.T) {
	c := &chart.Chart{
		Metadata: &chart.Metadata{
			Name:    "moby",
			Version: "1.2.3",
		},
		Templates: []*chart.Template{
			{Name: "test1", Data: []byte("{{.outer | title }} {{.inner | title}}")},
			{Name: "test2", Data: []byte("{{.global.callme | lower }}")},
		},
		Values: &chart.Config{
			Raw: "outer: DEFAULT\ninner: DEFAULT",
		},
	}

	vals := &chart.Config{
		Raw: "outer: BAD\ninner: inn",
	}

	overrides := map[string]interface{}{
		"outer": "spouter",
		"global": map[string]interface{}{
			"callme": "Ishmael",
		},
	}

	e := New()
	v, err := chartutil.CoalesceValues(c, vals, overrides)
	if err != nil {
		t.Fatalf("Failed to coalesce values: %s", err)
	}
	out, err := e.Render(c, v)
	if err != nil {
		t.Errorf("Failed to render templates: %s", err)
	}

	expect := "Spouter Inn"
	if out["test1"] != expect {
		t.Errorf("Expected %q, got %q", expect, out["test1"])
	}

	expect = "ishmael"
	if out["test2"] != expect {
		t.Errorf("Expected %q, got %q", expect, out["test2"])
	}

	if _, err := e.Render(c, v); err != nil {
		t.Errorf("Unexpected error: %s", err)
	}
}

func TestRenderInternals(t *testing.T) {
	// Test the internals of the rendering tool.
	e := New()

	vals := chartutil.Values{"Name": "one", "Value": "two"}
	tpls := map[string]renderable{
		"one": {tpl: `Hello {{title .Name}}`, vals: vals},
		"two": {tpl: `Goodbye {{upper .Value}}`, vals: vals},
		// Test whether a template can reliably reference another template
		// without regard for ordering.
		"three": {tpl: `{{template "two" dict "Value" "three"}}`, vals: vals},
	}

	out, err := e.render(tpls)
	if err != nil {
		t.Fatalf("Failed template rendering: %s", err)
	}

	if len(out) != 3 {
		t.Fatalf("Expected 3 templates, got %d", len(out))
	}

	if out["one"] != "Hello One" {
		t.Errorf("Expected 'Hello One', got %q", out["one"])
	}

	if out["two"] != "Goodbye TWO" {
		t.Errorf("Expected 'Goodbye TWO'. got %q", out["two"])
	}

	if out["three"] != "Goodbye THREE" {
		t.Errorf("Expected 'Goodbye THREE'. got %q", out["two"])
	}
}

func TestParallelRenderInternals(t *testing.T) {
	// Make sure that we can use one Engine to run parallel template renders.
	e := New()
	var wg sync.WaitGroup
	for i := 0; i < 20; i++ {
		wg.Add(1)
		go func(i int) {
			fname := "my/file/name"
			tt := fmt.Sprintf("expect-%d", i)
			v := chartutil.Values{"val": tt}
			tpls := map[string]renderable{fname: {tpl: `{{.val}}`, vals: v}}
			out, err := e.render(tpls)
			if err != nil {
				t.Errorf("Failed to render %s: %s", tt, err)
			}
			if out[fname] != tt {
				t.Errorf("Expected %q, got %q", tt, out[fname])
			}
			wg.Done()
		}(i)
	}
	wg.Wait()
}

func TestAllTemplates(t *testing.T) {
	ch1 := &chart.Chart{
		Templates: []*chart.Template{
			{Name: "foo", Data: []byte("foo")},
			{Name: "bar", Data: []byte("bar")},
		},
		Dependencies: []*chart.Chart{
			{
				Templates: []*chart.Template{
					{Name: "pinky", Data: []byte("pinky")},
					{Name: "brain", Data: []byte("brain")},
				},
				Dependencies: []*chart.Chart{
					{Templates: []*chart.Template{
						{Name: "innermost", Data: []byte("innermost")},
					}},
				},
			},
		},
	}

	var v chartutil.Values
	tpls := allTemplates(ch1, v)
	if len(tpls) != 5 {
		t.Errorf("Expected 5 charts, got %d", len(tpls))
	}
}

func TestRenderDependency(t *testing.T) {
	e := New()
	deptpl := `{{define "myblock"}}World{{end}}`
	toptpl := `Hello {{template "myblock"}}`
	ch := &chart.Chart{
		Templates: []*chart.Template{
			{Name: "outer", Data: []byte(toptpl)},
		},
		Dependencies: []*chart.Chart{
			{
				Templates: []*chart.Template{
					{Name: "inner", Data: []byte(deptpl)},
				},
			},
		},
	}

	out, err := e.Render(ch, map[string]interface{}{})

	if err != nil {
		t.Fatalf("failed to render chart: %s", err)
	}

	if len(out) != 2 {
		t.Errorf("Expected 2, got %d", len(out))
	}

	expect := "Hello World"
	if out["outer"] != expect {
		t.Errorf("Expected %q, got %q", expect, out["outer"])
	}

}

func TestRenderNestedValues(t *testing.T) {
	e := New()

	innerpath := "charts/inner/templates/inner.tpl"
	outerpath := "templates/outer.tpl"
	deepestpath := "charts/inner/charts/deepest/templates/deepest.tpl"

	deepest := &chart.Chart{
		Metadata: &chart.Metadata{Name: "deepest"},
		Templates: []*chart.Template{
			{Name: deepestpath, Data: []byte(`And this same {{.what}} that smiles {{.global.when}}`)},
		},
		Values: &chart.Config{Raw: `what: "milkshake"`},
	}

	inner := &chart.Chart{
		Metadata: &chart.Metadata{Name: "herrick"},
		Templates: []*chart.Template{
			{Name: innerpath, Data: []byte(`Old {{.who}} is still a-flyin'`)},
		},
		Values:       &chart.Config{Raw: `who: "Robert"`},
		Dependencies: []*chart.Chart{deepest},
	}

	outer := &chart.Chart{
		Metadata: &chart.Metadata{Name: "top"},
		Templates: []*chart.Template{
			{Name: outerpath, Data: []byte(`Gather ye {{.what}} while ye may`)},
		},
		Values: &chart.Config{
			Raw: `
what: stinkweed
who: me
herrick:
    who: time`,
		},
		Dependencies: []*chart.Chart{inner},
	}

	injValues := chart.Config{
		Raw: `
what: rosebuds
herrick:
  deepest:
    what: flower
global:
  when: to-day`,
	}

	inject, err := chartutil.CoalesceValues(outer, &injValues, map[string]interface{}{})
	if err != nil {
		t.Fatalf("Failed to coalesce values: %s", err)
	}

	t.Logf("Calculated values: %v", inject)

	out, err := e.Render(outer, inject)
	if err != nil {
		t.Fatalf("failed to render templates: %s", err)
	}

	if out[outerpath] != "Gather ye rosebuds while ye may" {
		t.Errorf("Unexpected outer: %q", out[outerpath])
	}

	if out[innerpath] != "Old time is still a-flyin'" {
		t.Errorf("Unexpected inner: %q", out[innerpath])
	}

	if out[deepestpath] != "And this same flower that smiles to-day" {
		t.Errorf("Unexpected deepest: %q", out[deepestpath])
	}
}