package main

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"slices"
	"strings"
	"testing"
	"time"
)

// rest sends a request to the REST API with a token.
func rest(h http.Handler, token, method, path, body string, headers map[string]string) *httptest.ResponseRecorder {
	req := httptest.NewRequest(method, path, strings.NewReader(body))
	if token != "" {
		req.Header.Set("Authorization", "Bearer "+token)
	}
	for k, v := range headers {
		req.Header.Set(k, v)
	}
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	return rec
}

func TestRESTAuthAndScopes(t *testing.T) {
	a, _ := newTestApp(t)
	h := a.routes()
	if rec := rest(h, "", "GET", "/api/v1/status", "", nil); rec.Code != http.StatusUnauthorized {
		t.Fatalf("no token: %d", rec.Code)
	}
	_, read, _ := a.tokens.Create("reader", "read")
	_, change, _ := a.tokens.Create("changer", "change")
	if rec := rest(h, read, "GET", "/api/v1/status", "", nil); rec.Code != 200 || !strings.Contains(rec.Body.String(), `"uplink"`) {
		t.Fatalf("status: %d %s", rec.Code, rec.Body)
	}
	if rec := rest(h, read, "DELETE", "/api/v1/changes", "", nil); rec.Code != http.StatusForbidden {
		t.Fatalf("a read token discards: %d", rec.Code)
	}
	if rec := rest(h, read, "PATCH", "/api/v1/settings", `{}`, map[string]string{"If-Match": "x"}); rec.Code != http.StatusForbidden {
		t.Fatalf("a read token patches: %d", rec.Code)
	}
	if rec := rest(h, change, "DELETE", "/api/v1/changes", "", nil); rec.Code == http.StatusForbidden || rec.Code == http.StatusUnauthorized {
		t.Fatalf("discard: %d %s", rec.Code, rec.Body)
	}
	if rec := rest(h, read, "POST", "/api/v1/status", "", nil); rec.Code != http.StatusMethodNotAllowed {
		t.Fatalf("POST: %d", rec.Code)
	}
	req := httptest.NewRequest("GET", "/api/v1/status", nil)
	req.Header.Set("Authorization", "Bearer "+read)
	req.Header.Set("Origin", "https://evil.example")
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	if rec.Code != http.StatusForbidden {
		t.Fatalf("foreign origin: %d", rec.Code)
	}
}

func TestRESTSettings(t *testing.T) {
	a, sys := newTestApp(t)
	if data, err := os.ReadFile(sys.settingsPath()); err == nil {
		os.WriteFile(sys.confirmedPath(), data, 0o600)
	}
	h := a.routes()
	_, tok, _ := a.tokens.Create("changer", "change")
	rec := rest(h, tok, "GET", "/api/v1/settings", "", nil)
	if rec.Code != 200 {
		t.Fatalf("get: %d", rec.Code)
	}
	etag := rec.Header().Get("ETag")
	if etag == "" {
		t.Fatal("no ETag header")
	}
	patch := `{"system":{"hostName":"gw"}}`
	if rec := rest(h, tok, "PATCH", "/api/v1/settings", patch, nil); rec.Code != http.StatusBadRequest {
		t.Fatalf("without If-Match: %d", rec.Code)
	}
	if rec := rest(h, tok, "PATCH", "/api/v1/settings", patch, map[string]string{"If-Match": `"0000"`}); rec.Code != http.StatusConflict {
		t.Fatalf("stale ETag: %d %s", rec.Code, rec.Body)
	}
	if rec := rest(h, tok, "PATCH", "/api/v1/settings", `{"system":{"sshKeys":[]}}`, map[string]string{"If-Match": etag}); rec.Code != http.StatusBadRequest {
		t.Fatalf("refused patch: %d", rec.Code)
	}
	rec = rest(h, tok, "PATCH", "/api/v1/settings", patch, map[string]string{"If-Match": etag})
	if rec.Code != 200 || !strings.Contains(rec.Body.String(), `"saved": true`) || rec.Header().Get("ETag") == etag {
		t.Fatalf("patch: %d %s", rec.Code, rec.Body)
	}
	rec = rest(h, tok, "GET", "/api/v1/changes", "", nil)
	if !strings.HasPrefix(rec.Header().Get("Content-Type"), "text/plain") || !strings.Contains(rec.Body.String(), "gw") {
		t.Fatalf("changes: %s %s", rec.Header().Get("Content-Type"), rec.Body)
	}
}

func TestLogs(t *testing.T) {
	one := 0
	cases := []struct {
		q    logQuery
		want []string
		bad  bool
	}{
		{logQuery{Unit: "router-webui"}, []string{"--lines=100"}, false},
		{logQuery{}, nil, true},
		{logQuery{Unit: "sshd.service"}, []string{"--unit=sshd.service"}, false},
		{logQuery{Unit: "systemd-journald"}, nil, true},
		{logQuery{Unit: "getty@tty1"}, nil, true},
		{logQuery{Unit: "router-pppoe", Lines: 5, Since: "1 hour ago", Priority: "err", Grep: "LCP", Boot: &one},
			[]string{"--lines=5", "--unit=router-pppoe", "--since=1 hour ago", "--priority=err", "--grep=LCP", "--boot=0"}, false},
		{logQuery{Unit: "kernel"}, []string{"-k"}, false},
		{logQuery{Unit: "--vacuum-time=1s"}, nil, true},
		{logQuery{Unit: "a b"}, nil, true},
		{logQuery{Unit: "router-webui", Lines: 5000}, nil, true},
		{logQuery{Unit: "router-webui", Priority: "loud"}, nil, true},
		{logQuery{Unit: "router-webui", Since: "$(reboot)"}, nil, true},
	}
	for _, c := range cases {
		args, err := journalArgs(c.q)
		if (err != nil) != c.bad {
			t.Fatalf("%+v: error %v", c.q, err)
		}
		for _, w := range c.want {
			if !slices.Contains(args, w) {
				t.Errorf("%+v: %q missing from %q", c.q, w, args)
			}
		}
	}

	a, _ := newTestApp(t)
	h := a.routes()
	var got []string
	runJournal = func(name string, args ...string) (string, error) {
		got = append([]string{name}, args...)
		return "2026-10-31T22:16:08+0000 router pppd[1]: Connected", nil
	}
	t.Cleanup(func() { runJournal = command })
	_, tok, _ := a.tokens.Create("reader", "read")
	rec := rest(h, tok, "GET", "/api/v1/logs?unit=router-pppoe&lines=3&boot=-1", "", nil)
	if rec.Code != 200 || !strings.Contains(rec.Body.String(), "Connected") || !slices.Contains(got, "--boot=-1") || !slices.Contains(got, "--lines=3") {
		t.Fatalf("logs: %d %s %q", rec.Code, rec.Body, got)
	}
	if rec := rest(h, tok, "GET", "/api/v1/logs?lines=abc", "", nil); rec.Code != http.StatusBadRequest {
		t.Fatalf("bad number: %d", rec.Code)
	}
	if rec := rest(h, tok, "GET", "/api/v1/logs?unit=-x", "", nil); rec.Code != http.StatusBadRequest {
		t.Fatalf("bad unit: %d", rec.Code)
	}
	text, failed := call(t, h, tok, "get_logs", map[string]any{"unit": "router-webui", "grep": "x"})
	if failed || !strings.Contains(text, "Connected") || !slices.Contains(got, "--unit=router-webui") {
		t.Fatalf("mcp get_logs: %v %q", failed, text)
	}
}

func TestOpenAPI(t *testing.T) {
	a, _ := newTestApp(t)
	h := a.routes()
	rec := rest(h, "", "GET", "/api/openapi.json", "", nil)
	if rec.Code != 200 {
		t.Fatalf("spec: %d", rec.Code)
	}
	var spec struct {
		OpenAPI string                               `json:"openapi"`
		Paths   map[string]map[string]map[string]any `json:"paths"`
	}
	if err := json.Unmarshal(rec.Body.Bytes(), &spec); err != nil || spec.OpenAPI != "3.1.0" {
		t.Fatalf("spec: %v %s", err, spec.OpenAPI)
	}
	// Every tool has an operation (the two interfaces stay equal).
	ops := map[string]bool{}
	for _, methods := range spec.Paths {
		for _, op := range methods {
			ops[op["operationId"].(string)] = true
		}
	}
	for _, tool := range mcpTools {
		if !ops[tool.name] {
			t.Errorf("tool %s has no REST operation", tool.name)
		}
	}
	for _, rt := range apiRoutes {
		if spec.Paths[rt.path][strings.ToLower(rt.method)] == nil {
			t.Errorf("%s %s is not in the spec", rt.method, rt.path)
		}
	}
}

func TestTokenExpiry(t *testing.T) {
	a, _ := newTestApp(t)
	h := a.routes()
	tok, secret, err := a.tokens.CreateFor("short", "read", time.Hour)
	if err != nil || tok.Expires.IsZero() {
		t.Fatalf("create: %v %+v", err, tok)
	}
	if rec := rest(h, secret, "GET", "/api/v1/status", "", nil); rec.Code != 200 {
		t.Fatalf("valid token: %d", rec.Code)
	}
	// Move its end into the past.
	toks := a.tokens.load()
	toks[0].Expires = time.Now().Add(-time.Minute)
	if err := a.tokens.save(toks); err != nil {
		t.Fatal(err)
	}
	if rec := rest(h, secret, "GET", "/api/v1/status", "", nil); rec.Code != http.StatusUnauthorized {
		t.Fatalf("expired token: %d", rec.Code)
	}
	if rec, _ := rpc(h, secret, "ping", nil); rec.Code != http.StatusUnauthorized {
		t.Fatalf("expired token on MCP: %d", rec.Code)
	}
	_, forever, _ := a.tokens.Create("long", "read")
	if rec := rest(h, forever, "GET", "/api/v1/status", "", nil); rec.Code != 200 {
		t.Fatalf("token without expiry: %d", rec.Code)
	}
}

func TestTokenEditNote(t *testing.T) {
	a, sys := newTestApp(t)
	h := a.routes()
	data, _ := os.ReadFile(sys.settingsPath())
	os.WriteFile(sys.confirmedPath(), data, 0o600)
	_, tok, _ := a.tokens.Create("assistant", "change")
	rec := rest(h, tok, "GET", "/api/v1/settings", "", nil)
	e := rec.Header().Get("ETag")
	if rec := rest(h, tok, "PATCH", "/api/v1/settings", `{"system":{"hostName":"gw"}}`, map[string]string{"If-Match": e}); rec.Code != 200 {
		t.Fatalf("patch: %d %s", rec.Code, rec.Body)
	}
	cur, _ := os.ReadFile(sys.settingsPath())
	if note := sys.tokenEditNote(cur); !strings.Contains(note, "assistant") {
		t.Fatalf("no note: %q", note)
	}
	// A later edit by a person makes the note stale.
	other := append([]byte(nil), cur...)
	other = append(other, '\n', ' ')
	if note := sys.tokenEditNote(other); note != "" {
		t.Fatalf("stale note: %q", note)
	}
}

func TestAPIReference(t *testing.T) {
	a, _ := newTestApp(t)
	h := a.routes()
	if rec := do(h, "GET", "/apireference", nil, nil); rec.Code != http.StatusSeeOther {
		t.Fatalf("without a session: %d", rec.Code)
	}
	cookie := login(t, h)
	rec := do(h, "GET", "/apireference", nil, cookie)
	body := rec.Body.String()
	if rec.Code != 200 {
		t.Fatalf("reference: %d", rec.Code)
	}
	for _, rt := range apiRoutes {
		if !strings.Contains(body, rt.path) {
			t.Errorf("%s is not on the page", rt.path)
		}
	}
	if !strings.Contains(body, "curl -sk") || !strings.Contains(body, "If-Match") || !strings.Contains(body, "unit=router-pppoe") {
		t.Errorf("examples missing")
	}
}