package link

import (
	"encoding/json"
	"testing"
)

func TestTheWireFormatIsExactlyTheseFieldNames(t *testing.T) {
	// The contract with the control plane, which defines these separately. A matching test lives
	// there; rename a field on either side and both fail.
	for _, c := range []struct {
		value  any
		expect []string
	}{
		// novox/hq ADR 0539 §9: the node's facts carry the node-engine's own writer, epoch and sequence.
		{Report{Node: "n", Writer: Writer, Order: Order{Epoch: 1, Sequence: 2}},
			[]string{"node", "writer", "epoch", "sequence"}},
		{Report{Node: "n", Applied: []string{"a"}, Failed: map[string]string{"k": "v"}, Refused: "r"},
			[]string{"node", "applied", "failed", "refused"}},
		// novox/hq ADR 0100: what an adopted node holds, the firewall it was found with, and what
		// is reachable on it.
		{Report{Node: "n", Held: []Held{{ID: "i"}}, Firewall: "ufw", Reachable: []Reach{{Port: 1}}},
			[]string{"node", "held", "firewall", "reachable"}},
		{Held{ID: "i", Module: "m", Kind: "file", Target: "/t", Changed: "rewritten", Kept: "/k"},
			[]string{"id", "module", "kind", "target", "since", "changed", "kept"}},
		{Reach{Protocol: "tcp", Address: "0.0.0.0", Port: 8080, By: "c", Published: true, ContainerPort: 80},
			[]string{"protocol", "address", "port", "by", "published", "container-port"}},
		// novox/hq to-be 45 §8: a witness's verdicts, said on every report while they stand, and the
		// witness contract this host keeps.
		{Report{Node: "n", Rollbacks: []Rollback{{Component: ComponentController}}, Witness: WitnessContract},
			[]string{"node", "rollbacks", "witness"}},
		{Rollback{Component: ComponentNodeTools, From: "sha256:b", To: "sha256:a", Outcome: RolledBack, Why: "w"},
			[]string{"component", "from", "to", "outcome", "why", "at"}},
		// novox/hq ADR 0240: every long-running resource's health, in every report and in its own event.
		{Report{Node: "n", Health: &Health{Contract: LivenessContract}}, []string{"node", "health"}},
		{Health{Contract: LivenessContract, Resources: []ResourceHealth{}}, []string{"contract", "at", "resources"}},
		{ResourceHealth{Module: "m", Resource: "m.r", Kind: "container", Target: "t", State: StateUnhealthy,
			Reason: ReasonRestarting, Streak: 2, Restarts: 3, Check: "http", Needs: "postgres-database"},
			[]string{"module", "resource", "kind", "target", "state", "reason", "since", "streak", "restarts",
				"check", "needs"}},
		{HealthSaid{Node: "n"}, []string{"node", "health"}},
		// novox/hq ADR 0266: an account judged for whether it can become root without a person.
		{ResourceHealth{Module: "m", Resource: "m.agent", Kind: KindAccount, Account: "agent", Root: "never"},
			[]string{"module", "resource", "kind", "target", "state", "since", "account", "root"}},
		// novox/hq ADR 0241: the machine's own networking, beside its resources.
		{Health{Contract: ReadinessContract, Resources: []ResourceHealth{}, Network: &NetworkHealth{State: "unhealthy",
			Parts: []NetworkPart{}}}, []string{"contract", "at", "resources", "network"}},
		{NetworkHealth{State: "unhealthy", Parts: []NetworkPart{}}, []string{"state", "since", "parts"}},
		{NetworkPart{Part: "resolv-conf", State: "unhealthy", Reason: "r", Said: "s", Writer: "w", Owner: "o",
			Toward: []string{"hub"}, Streak: 2}, []string{"part", "state", "reason", "said", "writer", "owner", "toward",
			"since", "streak"}},
	} {
		raw, err := json.Marshal(c.value)
		if err != nil {
			t.Fatal(err)
		}
		var fields map[string]any
		if err := json.Unmarshal(raw, &fields); err != nil {
			t.Fatal(err)
		}
		for _, want := range c.expect {
			if _, ok := fields[want]; !ok {
				t.Errorf("%T has no %q field; the control plane uses that name", c.value, want)
			}
		}
		if len(fields) != len(c.expect) {
			t.Errorf("%T has %d fields, expected %d: %v", c.value, len(fields), len(c.expect), fields)
		}
	}
}