package check

import (
	"context"
	"errors"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/delivery"
)

// fakeCompositions answers the assigner's composition of a check from memory, recording the keys asked.
type fakeCompositions struct {
	v     delivery.CompositionVerdict
	err   error
	asked []string
}

func (f *fakeCompositions) Await(_ context.Context, key string) (delivery.CompositionVerdict, error) {
	f.asked = append(f.asked, key)
	return f.v, f.err
}

// 1297/AC3 (its unit half): a check whose tests pass takes the assigner's composition of it, by the check's own key,
// into its verdict: a pass says it passed with the mesh-sdk and machines it composed, and is no longer "not run".
func TestAPassingCheckTakesTheAssignersComposition(t *testing.T) {
	b := newBench(t)
	f := &fakeCompositions{v: delivery.CompositionVerdict{Group: "feat/x", Heads: "0123456789ab", State: delivery.CompositionPass, SDK: "v0.1.14-x", Machines: []string{"g14"}, Took: 40}}
	b.ex.Compositions = f
	cs := caseOf(t, pullOf(repoA, 7, head1))
	v := b.judge(t, cs).Verdict
	if v.State != delivery.VerdictPass || v.Composition == nil || v.Composition.State != delivery.CompositionPass || v.Composition.SDK != "v0.1.14-x" || v.Took.Composition != 40 {
		t.Fatalf("verdict = %+v, composition %+v", v, v.Composition)
	}
	if len(f.asked) != 1 || f.asked[0] != cs.Key {
		t.Errorf("asked %v, want the check's key %s", f.asked, cs.Key)
	}
	if !compositionMentions(v, "passed") {
		t.Errorf("the line says %q", compositionWords(v.Composition, v.Took.Composition))
	}
}

func compositionMentions(v delivery.Verdict, word string) bool {
	return strings.Contains(compositionWords(v.Composition, v.Took.Composition), word)
}

// 1297/AC2 at the checker: a failed composition fails the check, naming the machine it failed at and its words.
func TestAFailedCompositionFailsTheCheck(t *testing.T) {
	b := newBench(t)
	b.ex.Compositions = &fakeCompositions{v: delivery.CompositionVerdict{Group: "feat/x", Heads: "0123456789ab", State: delivery.CompositionFail, SDK: "x",
		Machine: "g14", Words: "g14 runs web, which the change removes from its source"}}
	v := b.judge(t, caseOf(t, pullOf(repoA, 7, head1))).Verdict
	if v.State != delivery.VerdictFail || v.Failed.Machine != "g14" || v.Composition == nil || v.Composition.State != delivery.CompositionFail {
		t.Fatalf("verdict = %+v", v)
	}
	v.Group, v.Heads = "feat/x", "0123456789ab" // the checker names them when it writes the verdict
	if _, err := delivery.EncodeVerdict(v); err != nil {
		t.Errorf("the verdict cannot be written: %v", err)
	}
}

// 1297/B3d: a composition that cannot be read leaves it not run; a try is not composed.
func TestACompositionNotHadIsNotRun(t *testing.T) {
	b := newBench(t)
	f := &fakeCompositions{err: errors.New("the check's bound passed")}
	b.ex.Compositions = f
	v := b.judge(t, caseOf(t, pullOf(repoA, 7, head1))).Verdict
	if v.State != delivery.VerdictPass || v.Composition == nil || v.Composition.State != delivery.CompositionNotRun {
		t.Fatalf("verdict = %+v", v)
	}
	b2 := newBench(t)
	f2 := &fakeCompositions{v: delivery.CompositionVerdict{State: delivery.CompositionFail, Words: "w", SDK: "x"}}
	b2.ex.Compositions = f2
	cs := caseOf(t, pullOf(repoA, 7, head1))
	cs.Try = &TryOptions{}
	b2.judge(t, cs)
	if len(f2.asked) != 0 {
		t.Errorf("a try asked for a composition: %v", f2.asked)
	}
}