package delivery

import (
	"errors"
	"reflect"
	"strings"
	"testing"
	"time"
)

const askCommit = "0123456789abcdef0123456789abcdef01234567"

func buildAsk() StepAsk {
	return StepAsk{ID: "mh3k2x9qa1b2c3", Kind: AskDelivery, Language: AskGo, Asker: "mesh-delivery-builder",
		At: time.Date(2026, 10, 23, 13, 0, 0, 0, time.UTC),
		Build: &BuildJob{Module: "mesh-delivery-view", Path: "modules/mesh-delivery-view", FP: "ab12",
			Fetch:     map[string]any{"repository": "novox/mesh-delivery", "commit": askCommit, "dir": "modules/mesh-delivery-view", "paths": []any{"cmd"}},
			Artifacts: []AskArtifact{{Artifact: "bundle"}, {Artifact: "base", From: "registry/x@sha256:00"}},
			Publish:   true, Toolchain: &ToolchainUsed{Version: "go1.26.0", Recipe: "3"}}}
}

func checkAsk() StepAsk {
	return StepAsk{ID: "mh3k2x9qa1b2c4", Kind: AskCheck, Language: AskNode, Asker: "mesh-delivery-checker",
		At: time.Date(2026, 10, 23, 13, 0, 0, 0, time.UTC),
		Check: &CheckJob{Fetch: map[string]any{"repository": "novox/mesh-catalog", "commit": askCommit, "ref": "refs/pull/3/head", "base": askCommit},
			Level: LevelUnit, Kept: true, Runner: "workspace", RunnerWhen: "modules/mesh-build-go/", Run: ""}}
}

// 1887/A1a: an ask encodes and decodes with every field.
func TestAskRoundTrips(t *testing.T) {
	for _, a := range []StepAsk{buildAsk(), checkAsk()} {
		raw, err := EncodeStepAsk(a)
		if err != nil {
			t.Fatal(err)
		}
		got, err := DecodeStepAsk(raw)
		if err != nil {
			t.Fatal(err)
		}
		a.V = StepAskVersion
		if !reflect.DeepEqual(got, a) {
			t.Fatalf("round trip:\n got %+v\nwant %+v", got, a)
		}
	}
}

// 1887/A1a: an ask with an unknown kind or language is refused.
func TestAskRefusesUnknownKindAndLanguage(t *testing.T) {
	cases := map[string]func(*StepAsk){
		"kind":     func(a *StepAsk) { a.Kind = "build" },
		"language": func(a *StepAsk) { a.Language = "typescript" },
		"id":       func(a *StepAsk) { a.ID = "postgres" },
		"neither":  func(a *StepAsk) { a.Build = nil },
		"both":     func(a *StepAsk) { a.Check = &CheckJob{Level: LevelUnit, Fetch: a.Build.Fetch} },
		"recheck":  func(a *StepAsk) { a.Kind = AskRecheck },
		"commit":   func(a *StepAsk) { a.Build.Fetch = map[string]any{"repository": "novox/x", "commit": "main"} },
		"path":     func(a *StepAsk) { a.Build.Path = "" },
	}
	for name, change := range cases {
		a := buildAsk()
		change(&a)
		if _, err := EncodeStepAsk(a); err == nil {
			t.Errorf("%s: encoded", name)
		}
	}
	// A copy alone fetches nothing and needs no path.
	a := buildAsk()
	a.Build.Fetch, a.Build.Path, a.Build.Artifacts = nil, "", []AskArtifact{{Artifact: "base", From: "registry/x@sha256:00"}}
	if _, err := EncodeStepAsk(a); err != nil {
		t.Errorf("a copy alone: %v", err)
	}
	c := checkAsk()
	c.Kind = AskDelivery
	if _, err := EncodeStepAsk(c); err == nil {
		t.Error("a check on the delivery stream encoded")
	}
	c = checkAsk()
	c.Language = AskImage
	if _, err := EncodeStepAsk(c); err == nil {
		t.Error("a check of an image encoded")
	}
	raw, _ := EncodeStepAsk(buildAsk())
	for _, bad := range []string{
		strings.Replace(string(raw), `"kind":"delivery"`, `"kind":"queue"`, 1),
		strings.Replace(string(raw), `"language":"go"`, `"language":"rust"`, 1),
	} {
		if _, err := DecodeStepAsk([]byte(bad)); err == nil {
			t.Errorf("decoded %s", bad)
		}
	}
	if _, err := DecodeStepAsk([]byte(strings.Replace(string(raw), `"v":1`, `"v":2`, 1))); !errors.Is(err, ErrUnknownVersion) {
		t.Errorf("version 2: %v", err)
	}
}

// 1887/A1a: the subjects, stream and workers are the seat's, as the broker derives them.
func TestAskSubjects(t *testing.T) {
	s, err := AskSubject(AskGo, AskCheck)
	if err != nil || s != "mesh.seat.node-build-go.accept.check" {
		t.Fatalf("AskSubject = %q, %v", s, err)
	}
	language, kind, err := ParseAskSubject("mesh.seat.node-build-image.accept.delivery")
	if err != nil || language != AskImage || kind != AskDelivery {
		t.Fatalf("ParseAskSubject = %q %q %v", language, kind, err)
	}
	for _, bad := range []string{"mesh.seat.node-build-agent.accept.build", "mesh.seat.node-build-go.accept.queue", "mesh.seat.node-build-go.event.x"} {
		if _, _, err := ParseAskSubject(bad); err == nil {
			t.Errorf("parsed %s", bad)
		}
	}
	if st, _ := AskStream(AskNode); st != "SEAT_NODE_BUILD_NODE" {
		t.Errorf("AskStream = %q", st)
	}
	if w, _ := AskWorker(AskGo, AskRecheck); w != "SEAT_NODE_BUILD_GO_RECHECK_worker" {
		t.Errorf("AskWorker = %q", w)
	}
	if seat, _ := BuildSeat(AskImage); seat != "node-build-image" {
		t.Errorf("BuildSeat = %q", seat)
	}
	if m, _ := BuildModuleOf(AskNode); m != "mesh-build-node" {
		t.Errorf("BuildModuleOf = %q", m)
	}
	if _, err := BuildSeat("agent"); err == nil {
		t.Error("BuildSeat(agent)")
	}
}