package console

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

	"github.com/novox/mesh-tools/node-tools/internal/announce"
)

// meshToSearch is a mesh as discovery and the controller's records describe it: the service manager's
// verbs on two machines, the controller's own, a docker module with its tools, and what each replaces
// as the records say it — the seats' from `tools`, the module's from `modules`.
func meshToSearch(t *testing.T) *index {
	t.Helper()
	var endpoints []announce.Endpoint
	verbs := map[string]string{
		"units":   "The units the service manager knows in a scope, each with its load, active and sub state.",
		"status":  "One unit as the service manager sees it now: its states, whether it starts at boot.",
		"restart": "Restart one unit.",
		"journal": "The last lines of one unit's journal (at most 2000).",
	}
	for _, node := range []string{"anchor", "laptop"} {
		for verb, does := range verbs {
			endpoints = append(endpoints, announce.Endpoint{Kind: announce.KindSeat, Module: "systemd", Seat: "node-service-manager",
				Tool: verb, Scope: "node", Node: node, Description: does,
				Subject: "mesh.seat.node-service-manager.tool." + verb + "." + node})
		}
	}
	for verb, does := range map[string]string{
		"node":  "What one machine reported it can do, what it is assigned, and why.",
		"nodes": "Every machine the mesh knows, with whether it is converged or adopted.",
	} {
		endpoints = append(endpoints, announce.Endpoint{Kind: announce.KindSeat, Module: "mesh-controller", Seat: "mesh-controller",
			Tool: verb, Scope: "mesh", Description: does, Subject: "mesh.seat.mesh-controller.tool." + verb})
	}
	for tool, does := range map[string]string{
		"docker_list":            "Every container on this machine: name, image, state, ports.",
		"docker_logs":            "The last lines a container wrote.",
		"docker_secrets_in_logs": "Whether a container's logs hold a secret.",
		"docker_restart":         "Restart one container.",
	} {
		endpoints = append(endpoints, announce.Endpoint{Kind: announce.KindTool, Module: "docker", Tool: tool, Node: "anchor",
			Description: does, Subject: "mesh.mod.docker.tool." + tool + ".anchor"})
	}
	x, _, _ := indexOfEndpoints(endpoints)
	tools := json.RawMessage(`{"seats":[{"seat":"node-service-manager","scope":"node","tools":[
		{"name":"units","replaces":["systemctl list-units","systemctl --failed"]},
		{"name":"status","replaces":["systemctl status","systemctl is-active"]},
		{"name":"restart","replaces":["systemctl restart"]},
		{"name":"journal","replaces":["journalctl"]}]},
		{"seat":"mesh-controller","scope":"mesh","tools":[{"name":"node","replaces":["hostnamectl","uptime"]},{"name":"nodes"}]}]}`)
	x.Replaces = replacesOf(tools, []recordedModule{{Module: "docker", On: []string{"anchor"}, Tools: true,
		Replaces: map[string][]string{"docker_list": {"docker ps"}, "docker_logs": {"docker logs"}, "docker_restart": {"docker restart"}}}})
	return x
}

// **The words an agent has find the verb first** (novox/hq ADR 0242): the command it would have run, or
// the word it would have used, puts the mesh's tool for it at the top.
func TestSearchFindsTheToolThatReplacesACommandFirst(t *testing.T) {
	x := meshToSearch(t)
	for query, want := range map[string]string{
		"journalctl":                          "anchor/node-service-manager.journal",
		"journalctl -u mesh-controller -n 50": "anchor/node-service-manager.journal",
		"sudo journalctl -fu sshd":            "anchor/node-service-manager.journal",
		"/usr/bin/journalctl":                 "anchor/node-service-manager.journal",
		"logs":                                "anchor/node-service-manager.journal",
		"systemctl status":                    "anchor/node-service-manager.status",
		"systemctl status nats.service":       "anchor/node-service-manager.status",
		"systemctl restart mesh-controller":   "anchor/node-service-manager.restart",
		"systemctl --failed":                  "anchor/node-service-manager.units",
		"docker ps":                           "anchor/docker.docker_list",
		"docker ps -a":                        "anchor/docker.docker_list",
		"docker logs":                         "anchor/docker.docker_logs",
		"docker logs --tail 100 nats":         "anchor/docker.docker_logs",
		"docker restart nats":                 "anchor/docker.docker_restart",
		"container logs":                      "anchor/docker.docker_logs",
		"uptime":                              "mesh-controller.node",
	} {
		hits := x.search(query)
		if len(hits) == 0 {
			t.Errorf("%q found nothing; want %s first", query, want)
			continue
		}
		if hits[0].Address != want {
			var got []string
			for _, h := range hits {
				got = append(got, h.Address)
			}
			t.Errorf("%q found %s first; want %s (all: %s)", query, hits[0].Address, want, strings.Join(got, ", "))
		}
	}
}

// A match on a replaced command says which command it replaced, and the most specific one wins.
func TestASearchByCommandSaysWhatItReplaces(t *testing.T) {
	x := meshToSearch(t)
	hits := x.search("systemctl status sshd")
	if hits[0].InsteadOf != "systemctl status" {
		t.Errorf("the match does not say what it replaces: %+v", hits[0])
	}
	if hits[0].Also != "also on laptop" {
		t.Errorf("a node seat's verb does not say its other machines: %+v", hits[0])
	}
	// `logs` also finds the container's logs, after the journal — both are answers.
	var docker bool
	for _, h := range x.search("logs")[:3] {
		docker = docker || h.Address == "anchor/docker.docker_logs"
	}
	if !docker {
		t.Errorf("`logs` does not find docker_logs among the first: %+v", x.search("logs"))
	}
}

// What search did before stays: every word in a name or description, and nothing for a word nothing has.
// A synonym is a word, never part of one: `logs` matches through `log`, and finds no `login`.
func TestSearchStillMatchesEveryWord(t *testing.T) {
	x := meshToSearch(t)
	if hits := x.search("machine converged"); len(hits) != 1 || hits[0].Address != "mesh-controller.nodes" {
		t.Errorf("words in a description: %+v", hits)
	}
	if hits := x.search("journalctl kubernetes"); len(hits) != 1 || hits[0].Address != "anchor/node-service-manager.journal" {
		t.Errorf("a command with arguments nothing has is still that command: %+v", hits)
	}
	if hits := x.search("kubernetes"); len(hits) != 0 {
		t.Errorf("a word nothing has matched: %+v", hits)
	}
	x.Modules["shell"] = &moduleInfo{Module: "shell", On: []string{"anchor"}, Tools: []Tool{{Module: "shell", Name: "shell_login",
		Description: "The account's login shell."}}}
	for _, h := range x.search("logs") {
		if h.Address == "anchor/shell.shell_login" {
			t.Errorf("`logs` found `login` through its synonym `log`: %+v", h)
		}
	}
}

// A controller older than `replaces` answers without it: search matches names and descriptions as before.
func TestSearchWithoutReplacesMatchesAsBefore(t *testing.T) {
	x := meshToSearch(t)
	x.Replaces = replacesOf(json.RawMessage(`{"seats":[{"seat":"node-service-manager","tools":[{"name":"journal"}]}]}`),
		[]recordedModule{{Module: "docker"}})
	if len(x.Replaces) != 0 {
		t.Fatalf("replaces from records that have none: %v", x.Replaces)
	}
	if hits := x.search("journal"); len(hits) == 0 || hits[0].Address != "anchor/node-service-manager.journal" {
		t.Errorf("a verb's own name: %+v", hits)
	}
	if hits := x.search("docker logs"); len(hits) == 0 || hits[0].Address != "anchor/docker.docker_logs" {
		t.Errorf("a tool's own name: %+v", hits)
	}
}