package process

import (
	"encoding/json"
	"strings"
	"testing"
	"time"

	"github.com/nats-io/nats.go"

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

// 1191/AC3: given a module tool key <module>.<tool>, when called, then the subject is
// mesh.mod.<module>.call.<tool>.<token> with the same fallback (mesh.mod.<module>.tool.<tool>).
func TestCallSubjectsForAModuleTool(t *testing.T) {
	called, fallback, err := callSubjects("mesh-mail.send", "novox~mesh-mail~send")
	if err != nil {
		t.Fatal(err)
	}
	if called != "mesh.mod.mesh-mail.call.send.novox~mesh-mail~send" {
		t.Errorf("called: %q", called)
	}
	if fallback != "mesh.mod.mesh-mail.tool.send" {
		t.Errorf("fallback: %q", fallback)
	}
}

// 1191/AC1's subject (the seat form): seat:<seat>.<verb> calls mesh.seat.<seat>.call.<verb>.<token>,
// falling back to mesh.seat.<seat>.tool.<verb>.
func TestCallSubjectsForASeatVerb(t *testing.T) {
	called, fallback, err := callSubjects("seat:operator-channel.tell", "novox~mesh-mail~send")
	if err != nil {
		t.Fatal(err)
	}
	if called != "mesh.seat.operator-channel.call.tell.novox~mesh-mail~send" {
		t.Errorf("called: %q", called)
	}
	if fallback != "mesh.seat.operator-channel.tool.tell" {
		t.Errorf("fallback: %q", fallback)
	}
}

func TestCallSubjectsRefusesAKeyNamingNeither(t *testing.T) {
	for _, key := range []string{"", "nodot", "seat:", "seat:noverb", "."} {
		if _, _, err := callSubjects(key, "token"); err == nil {
			t.Errorf("callSubjects(%q) was accepted", key)
		}
	}
}

// 1470/AC1: key mesh-build-go.fetch, node ace, caller ace.mesh-delivery-builder.
func TestCallSubjectsOnANodeForAModuleTool(t *testing.T) {
	c := &Conn{account: Account{User: "ace.mesh-delivery-builder"}}
	called, fallback, err := callSubjectsOn("mesh-build-go.fetch", "ace", c.callerToken())
	if err != nil {
		t.Fatal(err)
	}
	if called != "mesh.mod.mesh-build-go.call.fetch.ace.ace~mesh-delivery-builder" {
		t.Errorf("called: %q", called)
	}
	if fallback != "mesh.mod.mesh-build-go.tool.fetch.ace" {
		t.Errorf("fallback: %q", fallback)
	}
}

// 1470/AC2: seat:node-files.read on g14.
func TestCallSubjectsOnANodeForASeatVerb(t *testing.T) {
	called, fallback, err := callSubjectsOn("seat:node-files.read", "g14", "tok")
	if err != nil {
		t.Fatal(err)
	}
	if called != "mesh.seat.node-files.call.read.g14.tok" || fallback != "mesh.seat.node-files.tool.read.g14" {
		t.Errorf("called %q, fallback %q", called, fallback)
	}
}

// 1470/AC3: a node that is not one token is refused before anything is published (the Conn has no
// connection, so only the name check can answer with this error).
func TestCallOnRefusesANodeThatIsNotOneToken(t *testing.T) {
	c := &Conn{}
	for _, node := range []string{"", "a.b", "*", ">", "a b", "a\tb"} {
		if _, err := c.CallOn(node, "mesh-build-go.fetch", nil); err == nil || !strings.Contains(err.Error(), "not a node name") {
			t.Errorf("CallOn(%q) = %v, want the refusal of the name", node, err)
		}
	}
}

// The review of 2026-10-30 (issue 774): a callee's own answer is delivered, whatever its words, and is never asked
// again during a blackout; only the transport's no responders is.
func TestACallIsAskedAgainOnlyWhenItReachedNoOne(t *testing.T) {
	busretry.Bound, busretry.FirstWait, busretry.MostWait = 50*time.Millisecond, time.Millisecond, 2*time.Millisecond
	for _, row := range []struct {
		name   string
		answer []error // per ask; the last repeats
		asks   int
	}{
		{"a callee answers jetstream not enabled: asked once", []error{answered("jetstream not enabled")}, 1},
		{"a callee answers no responders in its words: asked once", []error{answered("nats: no responders available for request")}, 1},
		{"no responders on either subject, then an answer", []error{nats.ErrNoResponders, nats.ErrNoResponders, nil}, 3},
	} {
		asks := 0
		_, err := callWith(func(string, []byte) (json.RawMessage, error) {
			e := row.answer[min(asks, len(row.answer)-1)]
			asks++
			return json.RawMessage(`{}`), e
		}, func() bool { return true }, "called", "fallback", nil)
		if asks != row.asks {
			t.Errorf("%s: asked %d times (%v), want %d", row.name, asks, err, row.asks)
		}
	}
}