package config

import (
	"bufio"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"guard/internal/match"
)

// TestPresets runs each preset over its sample lines in testdata/presets:
// what it must find, and what it must leave alone.
func TestPresets(t *testing.T) {
	for name, p := range Presets() {
		if p.Source != "" {
			continue
		}
		m, err := match.Compile(p.Match, p.Ignore)
		if err != nil {
			t.Fatalf("preset %s: %v", name, err)
		}
		f, err := os.Open(filepath.Join("..", "..", "testdata", "presets", name+".txt"))
		if err != nil {
			t.Errorf("preset %s has no sample lines: %v", name, err)
			continue
		}
		sc := bufio.NewScanner(f)
		n := 0
		for sc.Scan() {
			want, line, ok := strings.Cut(sc.Text(), "\t")
			if !ok || strings.HasPrefix(want, "#") {
				continue
			}
			n++
			a, matched := m.Match(line)
			switch {
			case want == "-" && matched:
				t.Errorf("%s: matched %s in %q", name, a, line)
			case want != "-" && !matched:
				t.Errorf("%s: no match in %q", name, line)
			case want != "-" && a.String() != want:
				t.Errorf("%s: %s, want %s, in %q", name, a, want, line)
			}
		}
		f.Close()
		if n == 0 {
			t.Errorf("preset %s: no sample lines", name)
		}
	}
}

func TestExampleParses(t *testing.T) {
	c, err := Parse([]byte(Example()))
	if err != nil {
		t.Fatal(err)
	}
	w := c.Watch[0]
	if w.Kind() != "journal" || w.Ban.List != "web" || w.Hits != 5 || w.Within.D() != 10*time.Minute || len(w.Match) == 0 {
		t.Errorf("the ssh watch: %+v", w)
	}
	if c.Defaults.Repeat.Max.D() != 7*24*time.Hour {
		t.Errorf("repeat %+v", c.Defaults.Repeat)
	}
}

func TestErrors(t *testing.T) {
	base := "housecarl: {url: https://fw:8070, list: web}\n"
	cases := []struct{ yaml, want string }{
		{"", "give url"},
		{base + "watch: [{name: a, preset: nope}]", `no preset "nope"`},
		{base + "watch: [{name: a, file: /x, match: ['no address']}]", "exactly one"},
		{base + "watch: [{name: a, file: /x, journal: {unit: x}, match: ['<IP>']}]", "one source"},
		{base + "watch: [{name: a, file: /x}]", "no match patterns"},
		{base + "watch: [{name: a, source: housecarl-drops, match: ['<IP>']}]", "no patterns"},
		{base + "watch: [{name: a, preset: sshd, ban: {protocol: tcp}}]", "without ban.port"},
		{base + "watch: [{name: a, preset: sshd, within: 10 minutes}]", "isn't a length of time"},
		{base + "watch: [{name: a, preset: sshd}, {name: A, preset: sshd}]", "used twice"},
		{base + "never_ban: ['not an address!']\nwatch: [{name: a, preset: sshd}]", "never_ban"},
		{base + "bogus: 1\nwatch: [{name: a, preset: sshd}]", "bogus"},
		{"housecarl: {url: https://fw:8070}\nwatch: [{name: a, preset: sshd}]", "which ban list"},
	}
	for _, c := range cases {
		_, err := Parse([]byte(c.yaml))
		if err == nil || !strings.Contains(err.Error(), c.want) {
			t.Errorf("%q: %v, want %q", c.yaml, err, c.want)
		}
	}
}

func TestPresetSourceAndOwnPatterns(t *testing.T) {
	c, err := Parse([]byte(`housecarl: {socket: /run/housecarl/housecarl.sock, list: router}
watch:
  - {name: ssh, preset: sshd, file: /var/log/auth.log, match: ['custom <IP> line']}
  - {name: scans, preset: housecarl-drops}
`))
	if err != nil {
		t.Fatal(err)
	}
	ssh := c.Watch[0]
	if ssh.Kind() != "file" || ssh.File != "/var/log/auth.log" || ssh.Match[len(ssh.Match)-1] != "custom <IP> line" || len(ssh.Match) < 2 {
		t.Errorf("own file and pattern beside the preset's: %+v", ssh)
	}
	if s := c.Watch[1]; s.Kind() != SourceHousecarlDrops || s.Protocol != "tcp" {
		t.Errorf("housecarl-drops: %+v", s)
	}
}

func TestDuration(t *testing.T) {
	for in, want := range map[string]time.Duration{"30s": 30 * time.Second, "1d12h": 36 * time.Hour, "1w": 7 * 24 * time.Hour} {
		if d, err := ParseDuration(in); err != nil || d != want {
			t.Errorf("%s: %v %v", in, d, err)
		}
		if got := FormatDuration(want); got != in {
			t.Errorf("format %v: %s, want %s", want, got, in)
		}
	}
}