package main

import (
	"strings"
	"testing"
	"time"
)

func TestParseFields(t *testing.T) {
	m, err := parseFields([]string{"a=1", "b=x=y"})
	if err != nil {
		t.Fatal(err)
	}
	if m["a"] != "1" || m["b"] != "x=y" {
		t.Errorf("m = %v", m)
	}
	for _, bad := range []string{"noequals", "=v"} {
		if _, err := parseFields([]string{bad}); err == nil {
			t.Errorf("%q: expected error", bad)
		}
	}
	if m, _ := parseFields(nil); m != nil {
		t.Error("nil input should give nil map")
	}
}

func TestCommonFlagsFilterDefaults(t *testing.T) {
	cf := &commonFlags{since: "1h", format: "text"}
	now := time.Date(2026, 8, 23, 12, 0, 0, 0, time.UTC)
	f, err := cf.filter(now)
	if err != nil {
		t.Fatal(err)
	}
	if !f.Since.Equal(now.Add(-time.Hour)) {
		t.Errorf("since = %s", f.Since)
	}
	if !f.Until.Equal(now) {
		t.Errorf("until = %s", f.Until)
	}
}

func TestGrepGuardBlocksWideUnfilteredSearch(t *testing.T) {
	cmd := newGrepCmd("chgrep")
	cmd.SetArgs([]string{"--since", "24h", "needle"})
	var out strings.Builder
	cmd.SetOut(&out)
	cmd.SetErr(&out)
	err := cmd.Execute()
	if err == nil || !strings.Contains(err.Error(), "--force") {
		t.Fatalf("expected guard error mentioning --force, got %v", err)
	}
}

func TestGrepGuardAllowsFilteredSearch(t *testing.T) {
	// A namespace filter disables the guard; the query then fails on the
	// unreachable server rather than the guard, proving the guard passed.
	t.Setenv("CH_URL", "http://127.0.0.1:1")
	cmd := newGrepCmd("chgrep")
	cmd.SetArgs([]string{"--since", "24h", "--namespace", "logging", "needle"})
	var out strings.Builder
	cmd.SetOut(&out)
	cmd.SetErr(&out)
	err := cmd.Execute()
	if err == nil {
		t.Fatal("expected connection error")
	}
	if strings.Contains(err.Error(), "--force") {
		t.Fatalf("guard should not trigger with a namespace filter: %v", err)
	}
}

func TestGrepGuardAllowsShortWindow(t *testing.T) {
	t.Setenv("CH_URL", "http://127.0.0.1:1")
	cmd := newGrepCmd("chgrep")
	cmd.SetArgs([]string{"--since", "1h", "needle"})
	err := cmd.Execute()
	if err == nil {
		t.Fatal("expected connection error")
	}
	if strings.Contains(err.Error(), "--force") {
		t.Fatalf("guard should not trigger for 1h window: %v", err)
	}
}

func TestEntrypointDispatch(t *testing.T) {
	root := newRootCmd()
	names := map[string]bool{}
	for _, c := range root.Commands() {
		names[c.Name()] = true
	}
	for _, want := range []string{"cat", "tail", "grep"} {
		if !names[want] {
			t.Errorf("chlog missing subcommand %q", want)
		}
	}
}