package main

import (
	"bytes"
	"encoding/json"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"

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

// 1921 (B0, D2): the checking program answers, on its last line, the verdict the rules give the facts in its input, and
// refuses facts of a version it does not read, an input it is not given, and a question it is not asked, naming each.
func TestTheCheckingProgramAnswersTheVerdictOfItsFacts(t *testing.T) {
	failing, _ := json.Marshal(rules.Tested{Level: delivery.LevelUnit, Tests: 3, Failed: []rules.Failure{{Package: "x/a", Test: "TestA", Cause: "a_test.go:9: boom"}}})
	facts := rules.Facts{V: rules.FactsVersion, Group: "feat/x", Heads: "0123456789ab", Members: []rules.Member{{Repository: "novox/x", Number: 3, Head: "h"}},
		Steps: []rules.Step{
			{Repository: "novox/x", Number: 3, Module: "mesh-build-go", Node: "laptop", Level: &delivery.LevelAnswer{Level: delivery.LevelUnit, Tests: []json.RawMessage{failing}}},
			{Repository: "novox/x", Number: 3, Failed: &delivery.FailedFirst{Machine: "laptop", Words: "novox/x#3 has files in conflict: go.mod"}},
		}}
	dir := t.TempDir()
	write := func(name string, v any) string {
		data, _ := json.Marshal(v)
		p := filepath.Join(dir, name)
		if err := os.WriteFile(p, data, 0o600); err != nil {
			t.Fatal(err)
		}
		return p
	}
	v1 := write("v1.json", facts)
	later := facts
	later.V = rules.FactsVersion + 1
	v2 := write("v2.json", later)
	for name, c := range map[string]struct {
		args  []string
		input string
		exit  int
		said  string
	}{
		"the facts":         {[]string{"-verdict"}, v1, 0, ""},
		"a later version":   {[]string{"-verdict"}, v2, 2, "facts of version 2, this checking program reads version 1"},
		"no input":          {[]string{"-verdict"}, "", 2, delivery.RunInputEnv + " names no file"},
		"nothing asked":     {nil, v1, 2, "nothing asked"},
		"an unknown asking": {[]string{"-judge"}, v1, 2, "-judge"},
	} {
		var out, errs bytes.Buffer
		exit := run(c.args, func(k string) string {
			if k == delivery.RunInputEnv {
				return c.input
			}
			return ""
		}, &out, &errs)
		if exit != c.exit || !strings.Contains(errs.String(), c.said) {
			t.Errorf("%s: exit %d, said %q; want %d and %q", name, exit, errs.String(), c.exit, c.said)
			continue
		}
		if c.exit != 0 {
			continue
		}
		lines := strings.Split(strings.TrimSpace(out.String()), "\n")
		var a rules.Answer
		if err := json.Unmarshal([]byte(lines[len(lines)-1]), &a); err != nil || a.V != rules.AnswerVersion {
			t.Fatalf("%s: the last line %q: %v", name, lines[len(lines)-1], err)
		}
		if want := rules.Judge(facts); !reflect.DeepEqual(a.Verdict, want) || a.Verdict.State != delivery.VerdictFail || len(a.Verdict.Failures) != 2 ||
			a.Verdict.Failures[1].Words != "novox/x#3 has files in conflict: go.mod" || a.Verdict.Machines[0] != "laptop" || a.Verdict.Levels[delivery.LevelUnit].Run != 3 {
			t.Errorf("%s: the verdict %+v, want %+v", name, a.Verdict, want)
		}
	}
}