package main

import (
	"encoding/json"
	"os"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
)

// slack's shape (novox/hq ADR 0208, ADR 0210, ADR 0212, ADR 0182): no package (Slack comes from the
// AUR, and the host installs from the official repositories only), no seat, no file; the X display on
// its own machine; one contribution to node-display-session that is both Slack's one start and its
// window rules; and the Go bundle serving exactly the listed slack_ tools.

type manifest struct {
	Module        string           `json:"module"`
	Version       string           `json:"version"`
	Capabilities  []string         `json:"capabilities"`
	Requires      []string         `json:"requires"`
	Tools         []string         `json:"tools"`
	Resources     []map[string]any `json:"resources"`
	Claims        []any            `json:"claims"`
	Seats         []any            `json:"seats"`
	Shell         []any            `json:"shell"`
	Contributions []struct {
		Seat    string `json:"seat"`
		Kind    string `json:"kind"`
		Content string `json:"content"`
	} `json:"contributions"`
	Environment any `json:"environment"`
	Build       struct {
		Artifacts []map[string]any `json:"artifacts"`
	} `json:"build"`
}

func readManifest(t *testing.T) (manifest, string) {
	t.Helper()
	raw, err := os.ReadFile(filepath.Join("..", "..", "module.json"))
	if err != nil {
		t.Fatal(err)
	}
	dec := json.NewDecoder(strings.NewReader(string(raw)))
	dec.DisallowUnknownFields()
	var m manifest
	if err := dec.Decode(&m); err != nil {
		t.Fatalf("module.json: %v", err)
	}
	return m, string(raw)
}

func TestItInstallsNothingAndOwnsNoFile(t *testing.T) {
	m, raw := readManifest(t)
	if m.Module != "slack" || !reflect.DeepEqual(m.Requires, []string{"x11-display"}) {
		t.Fatalf("%+v", m)
	}
	// slack-desktop is the AUR's: a package resource would ask the host for what it cannot install.
	if m.Resources != nil || m.Capabilities != nil {
		t.Fatalf("no package, no file: %v %v", m.Resources, m.Capabilities)
	}
	if m.Claims != nil || m.Seats != nil || m.Environment != nil || m.Shell != nil {
		t.Fatal("it holds no seat, sets no environment and adds no session code")
	}
	// Slack's own setting writes ~/.config/autostart/slack.desktop (a link): never the module's.
	for _, never := range []string{".config/autostart", ".config/Slack", "root-state", "Cookies"} {
		if strings.Contains(raw, never) {
			t.Errorf("module.json names %q", never)
		}
	}
}

func TestTheOneContributionIsTheStartAndTheWindowRules(t *testing.T) {
	m, _ := readManifest(t)
	if len(m.Contributions) != 1 {
		t.Fatalf("%+v", m.Contributions)
	}
	c := m.Contributions[0]
	if c.Seat != "node-display-session" || c.Kind != "config" || !strings.HasSuffix(c.Content, "\n") {
		t.Fatalf("%+v", c)
	}
	var execs, rules []string
	for _, l := range strings.Split(c.Content, "\n") {
		l = strings.TrimSpace(l)
		switch {
		case strings.HasPrefix(l, "exec"):
			execs = append(execs, l)
		case strings.HasPrefix(l, "for_window"):
			rules = append(rules, l)
		case l == "" || strings.HasPrefix(l, "#"):
		default:
			t.Errorf("a line that is neither the start nor a rule: %q", l)
		}
	}
	want := "exec --no-startup-id " + slackBin + " " + strings.Join(startArgs, " ")
	if len(execs) != 1 || execs[0] != want {
		t.Fatalf("one start, the package entry's arguments, as slack_restart starts it: %q", execs)
	}
	// The operator's rules of 2026-08 (50-slack.conf), verified then against Slack's windows.
	wantRules := []string{
		`for_window [class="(?i)^slack$" window_role="browser-window"] move to workspace $ws3`,
		`for_window [class="(?i)^slack$" window_role="browser-window"] floating disable`,
		`for_window [class="(?i)^slack$" window_role="browser-window"] border pixel 2`,
	}
	if !reflect.DeepEqual(rules, wantRules) {
		t.Fatalf("%q", rules)
	}
	for _, r := range rules {
		if !strings.HasPrefix(r, ruleMark) {
			t.Errorf("slack_check recognises the module's rules by %q: %s", ruleMark, r)
		}
	}
	// The placed lines start Slack once: the fake i3 configuration below holds exactly this content.
	f := newFake(t)
	f.write(testHome+"/"+i3Main, "exec --no-startup-id dex --autostart --environment i3\n# slack\n"+c.Content)
	if s := f.starts(); len(s) != 1 || !s[0].Mine {
		t.Fatalf("%+v", s)
	}
	if n, _ := f.windowRules(); n != 3 {
		t.Fatalf("%d rules", n)
	}
}

func TestTheToolsAgreeWithTheManifest(t *testing.T) {
	m, raw := readManifest(t)
	served := map[string]bool{}
	for _, tool := range tools() {
		served[tool.Name] = true
		if !strings.HasPrefix(tool.Name, "slack_") || strings.TrimSpace(tool.Description) == "" {
			t.Errorf("%s: prefixed slack_ and described", tool.Name)
		}
	}
	for _, name := range m.Tools {
		if !served[name] {
			t.Errorf("module.json lists %s, which the bundle does not serve", name)
		}
		delete(served, name)
	}
	for name := range served {
		t.Errorf("the bundle serves %s, which module.json does not list", name)
	}
	if len(m.Build.Artifacts) != 1 {
		t.Fatalf("%v", m.Build.Artifacts)
	}
	b := m.Build.Artifacts[0]
	if b["kind"] != "bundle" || b["language"] != "go" || b["system"] != "arch" ||
		b["from"] != "cmd/slack-tools" || b["binary"] != "slack-tools" {
		t.Errorf("the Go tools bundle: %v", b)
	}
	s := strings.ToLower(raw)
	for _, never := range []string{"/home/", "jochen", "g14", "shanks", "novox.be", "http", "password", "token"} {
		if strings.Contains(s, never) {
			t.Errorf("module.json names %q", never)
		}
	}
}