package main

import (
	"errors"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
	"time"

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

// Defends novox/hq ADR 0260: a value another module keeps reaches the bar over the bus, through this
// module's own bundle and directory, and an old one is not shown as if it were now.

func TestAValueIsKeptAsItsTextAndGoneWhenDeleted(t *testing.T) {
	dir := t.TempDir()
	w := Wanted{"power.draw", "laptop"}
	if err := keep(dir, w, stdio.StateChange{Op: "put", Value: []byte(`{"text":"18.2 W machine","watts":18.2}`)}); err != nil {
		t.Fatal(err)
	}
	b, err := os.ReadFile(filepath.Join(dir, "power.draw@laptop"))
	if err != nil || string(b) != "18.2 W machine\n" {
		t.Fatalf("%q %v", b, err)
	}
	if err := keep(dir, w, stdio.StateChange{Op: "delete"}); err != nil {
		t.Fatal(err)
	}
	if _, err := os.Stat(filepath.Join(dir, "power.draw@laptop")); !os.IsNotExist(err) {
		t.Fatal("a deleted value is still shown")
	}
	if err := keep(dir, w, stdio.StateChange{Op: "put", Value: []byte(`"no text"`)}); err == nil {
		t.Fatal("a value with no text was kept")
	}
}

func TestARefusedWatchIsTriedAgainAndAWatchedOneIsNot(t *testing.T) {
	bar := filepath.Join(t.TempDir(), "bottom-bar.toml")
	if err := os.WriteFile(bar, []byte(`command = "~/.local/bin/i3status-value power.draw laptop"`+"\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	watching := map[Wanted]bool{}
	calls := 0
	refuse := func(string, string, func(stdio.StateChange) error) error { calls++; return errors.New("not granted") }
	if said := followValues([]string{bar}, t.TempDir(), watching, refuse); len(said) != 1 || !strings.Contains(said[0], "not granted") {
		t.Fatalf("%v", said)
	}
	accept := func(state, key string, _ func(stdio.StateChange) error) error {
		calls++
		if state != "power.draw" || key != "laptop" {
			t.Fatalf("watched %s %s", state, key)
		}
		return nil
	}
	followValues([]string{bar}, t.TempDir(), watching, accept)
	followValues([]string{bar}, t.TempDir(), watching, accept)
	if calls != 2 {
		t.Fatalf("%d watches; once refused, once taken, then left alone", calls)
	}
}

func TestTheBlocksCommandShowsOnlyAFreshValue(t *testing.T) {
	runtime := t.TempDir()
	dir := filepath.Join(runtime, "i3status-rust", "values")
	run := func() string {
		cmd := exec.Command("sh", "../../files/bin/i3status-value", "power.draw", "laptop")
		cmd.Env = append(os.Environ(), "XDG_RUNTIME_DIR="+runtime)
		out, err := cmd.Output()
		if err != nil {
			t.Fatal(err)
		}
		return strings.TrimSpace(string(out))
	}
	if got := run(); got != "" {
		t.Fatalf("no value: %q", got)
	}
	if err := keep(dir, Wanted{"power.draw", "laptop"}, stdio.StateChange{Op: "put", Value: []byte(`{"text":"8.0 W CPU"}`)}); err != nil {
		t.Fatal(err)
	}
	if got := run(); got != "8.0 W CPU" {
		t.Fatalf("fresh: %q", got)
	}
	old := time.Now().Add(-31 * time.Second)
	if err := os.Chtimes(filepath.Join(dir, "power.draw@laptop"), old, old); err != nil {
		t.Fatal(err)
	}
	if got := run(); got != "" {
		t.Fatalf("31 s old: %q", got)
	}
}