package api_test

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

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

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

// hyperguild#157 slice 2: ReadNote (brain_get, read-after-write) read by
// path; it now reads through brainfs.
func TestReadNoteRefusesSymlinksAndSurvivesSwapRaces(t *testing.T) {
	brain := t.TempDir()
	facts := filepath.Join(brain, "wiki", "w", "facts")
	require.NoError(t, os.MkdirAll(facts, 0o755))
	require.NoError(t, os.Symlink(brainfstest.Outside(t), filepath.Join(facts, "leak.md")))
	_, body, _, err := api.ReadNote(brain, "wiki/w/facts/leak.md")
	assert.Error(t, err)
	assert.NotContains(t, body, brainfstest.Sentinel)
	// A link to a file elsewhere in the brain: os.Root allows it, only the
	// regular-file check refuses it (hyperguild#171).
	brainfstest.WriteSentinelAt(t, filepath.Join(brain, "raw", "s.md"))
	require.NoError(t, os.Symlink(filepath.Join("..", "..", "..", "raw", "s.md"), filepath.Join(facts, "inlink.md")))
	_, body, _, err = api.ReadNote(brain, "wiki/w/facts/inlink.md")
	assert.Error(t, err)
	assert.NotContains(t, body, brainfstest.Sentinel)

	p := filepath.Join(facts, "r.md")
	require.NoError(t, os.WriteFile(p, []byte("---\nx: y\n---\ninside"), 0o644))
	fm, body, _, err := api.ReadNote(brain, "wiki/w/facts/r.md")
	require.NoError(t, err)
	assert.Equal(t, "y", fm["x"])
	assert.Contains(t, body, "inside")
	read := func() string {
		fm, body, _, _ := api.ReadNote(brain, "wiki/w/facts/r.md")
		s := body
		for k, v := range fm {
			s += k + v
		}
		return s
	}
	brainfstest.AssertNoLeak(t, p, "---\nx: y\n---\ninside", 1500*time.Millisecond, read)
	inBrain := brainfstest.WriteSentinelAt(t, filepath.Join(brain, "raw", "s.md"))
	brainfstest.AssertNoLeakFrom(t, p, "---\nx: y\n---\ninside", inBrain, 1500*time.Millisecond, read)
	brainfstest.AssertNoHang(t, p, "---\nx: y\n---\ninside", 1500*time.Millisecond, 6*time.Second, func() { _ = read() })
}