package wiki

import (
	"fmt"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/mathiasbq/hyperguild/ingestion/internal/brainfs/brainfstest"
)

// hyperguild#157 slice 4: LoadInventory listed wiki/<type>/ with os.ReadDir
// and opened each .md by path, so a symlinked page put the target's title and
// aliases into the inventory (and the LLM prompts built from it), and a FIFO
// hung it. RebuildIndex read first sentences the same way.
func TestLoadInventoryRefusesSymlinksAndSurvivesSwapRaces(t *testing.T) {
	brain := t.TempDir()
	dir := filepath.Join(brain, "wiki", "concepts")
	require.NoError(t, os.MkdirAll(dir, 0o755))
	require.NoError(t, os.WriteFile(filepath.Join(dir, "ok.md"), []byte("---\ntitle: zqinside\n---\n"), 0o644))
	require.NoError(t, os.Symlink(brainfstest.Outside(t), filepath.Join(dir, "leak.md")))

	inv, err := LoadInventory(brain)
	require.NoError(t, err)
	got := fmt.Sprintf("%+v", inv)
	assert.Contains(t, got, "zqinside", "positive control")
	assert.NotContains(t, got, brainfstest.Sentinel)
	assert.NotContains(t, got, "leak", "a symlinked page is not listed")

	p := filepath.Join(dir, "r.md")
	read := func() string {
		inv, _ := LoadInventory(brain)
		return fmt.Sprintf("%+v", inv)
	}
	brainfstest.AssertNoLeak(t, p, "---\ntitle: zqinside\n---\n", 1500*time.Millisecond, read)
	brainfstest.AssertNoHang(t, p, "---\ntitle: zqinside\n---\n", 1500*time.Millisecond, 6*time.Second, func() { _ = read() })
}

func TestLoadInventorySkipsASymlinkedTypeDir(t *testing.T) {
	brain := t.TempDir()
	require.NoError(t, os.MkdirAll(filepath.Join(brain, "wiki"), 0o755))
	require.NoError(t, os.MkdirAll(filepath.Join(brain, "raw"), 0o755))
	require.NoError(t, os.WriteFile(filepath.Join(brain, "raw", "r.md"), []byte("---\ntitle: zqrawonly\n---\n"), 0o644))
	require.NoError(t, os.Symlink(filepath.Join("..", "raw"), filepath.Join(brain, "wiki", "concepts")))
	inv, _ := LoadInventory(brain)
	assert.NotContains(t, fmt.Sprintf("%+v", inv), "zqrawonly")
}

func TestRebuildIndexDoesNotReadAPageSwappedForASymlink(t *testing.T) {
	brain := t.TempDir()
	dir := filepath.Join(brain, "wiki", "concepts")
	require.NoError(t, os.MkdirAll(dir, 0o755))
	p := filepath.Join(dir, "r.md")
	require.NoError(t, os.WriteFile(p, []byte("---\ntitle: R\n---\nzqinside sentence.\n"), 0o644))
	require.NoError(t, RebuildIndex(brain, "2026-10-04"))
	idx, err := os.ReadFile(filepath.Join(brain, "wiki", "index.md"))
	require.NoError(t, err)
	require.Contains(t, string(idx), "zqinside", "positive control: the summary is read")

	read := func() string {
		_ = RebuildIndex(brain, "2026-10-04")
		b, _ := os.ReadFile(filepath.Join(brain, "wiki", "index.md"))
		return string(b)
	}
	brainfstest.AssertNoLeak(t, p, "---\ntitle: R\n---\nzqinside sentence.\n", 1500*time.Millisecond, read)
	brainfstest.AssertNoHang(t, p, "---\ntitle: R\n---\nzqinside sentence.\n", 1500*time.Millisecond, 6*time.Second, func() { _ = read() })
}