package storageagent

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

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

func TestNFSNormalize(t *testing.T) {
	ok := []struct {
		in       NFSSpec
		writable bool
		want     NFSSpec
	}{
		{NFSSpec{"nas.lan", "/export/music/", "rw,nfsvers=4.1,soft"}, false, NFSSpec{"nas.lan", "/export/music", "ro,nfsvers=4.1,soft"}},
		{NFSSpec{" 192.168.1.10 ", "/m", ""}, true, NFSSpec{"192.168.1.10", "/m", "rw"}},
		{NFSSpec{"fd00::1", "/m", "timeo=150,timeo=10"}, false, NFSSpec{"[fd00::1]", "/m", "ro,timeo=150"}},
	}
	for _, tc := range ok {
		got, err := tc.in.Normalize(tc.writable)
		require.NoError(t, err, tc.in)
		assert.Equal(t, tc.want, got)
	}

	bad := []struct {
		in    NFSSpec
		field string
	}{
		{NFSSpec{"nas;rm -rf /", "/m", ""}, "nfs_server"},
		{NFSSpec{"-oexec", "/m", ""}, "nfs_server"},
		{NFSSpec{"nas", "relative", ""}, "nfs_export"},
		{NFSSpec{"nas", "/a/../etc", ""}, "nfs_export"},
		{NFSSpec{"nas", "/m,exec", ""}, "nfs_export"},
		{NFSSpec{"nas", "/m", "exec"}, "nfs_options"},
		{NFSSpec{"nas", "/m", "nfsvers=9"}, "nfs_options"},
		{NFSSpec{"nas", "/m", "soft=1"}, "nfs_options"},
		{NFSSpec{"nas", "/m", "port"}, "nfs_options"},
	}
	for _, tc := range bad {
		_, err := tc.in.Normalize(false)
		var ve *ValidationError
		require.ErrorAs(t, err, &ve, tc.in)
		assert.Equal(t, tc.field, ve.Field, tc.in)
	}
}

type fakeMounter struct {
	mounted map[string]NFSSpec
	files   int
}

func (f *fakeMounter) Mount(_ context.Context, spec NFSSpec, target string) error {
	if err := os.MkdirAll(target, 0o755); err != nil {
		return err
	}
	for i := range f.files {
		_ = os.WriteFile(filepath.Join(target, "t"+itoa(i)+".flac"), nil, 0o644)
	}
	f.mounted[target] = spec
	return nil
}

func (f *fakeMounter) BindReadOnly(_ context.Context, src, target string) error {
	f.mounted[target] = NFSSpec{Export: "bind:" + src}
	return os.MkdirAll(target, 0o755)
}

func (f *fakeMounter) Unmount(_ context.Context, target string) error {
	delete(f.mounted, target)
	return nil
}

func TestMountEndpoint(t *testing.T) {
	root := t.TempDir()
	m := &fakeMounter{mounted: map[string]NFSSpec{}, files: 3}
	h := NewRouterWithMounter(nil, "secret", root, m)
	post := func(path string, body any) *httptest.ResponseRecorder {
		raw, _ := json.Marshal(body)
		req := httptest.NewRequest(http.MethodPost, path, bytes.NewReader(raw))
		req.Header.Set("Authorization", "Bearer secret")
		rec := httptest.NewRecorder()
		h.ServeHTTP(rec, req)
		return rec
	}

	id := "0190a1b2-c3d4-7e5f-8a9b-0c1d2e3f4a5b"
	rec := post("/internal/mounts", map[string]any{"source_id": id, "server": "nas", "export": "/music", "options": "soft"})
	require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())
	var res MountResult
	require.NoError(t, json.Unmarshal(rec.Body.Bytes(), &res))
	assert.Equal(t, MountResult{Status: "mounted", AudioFiles: 3, Message: "found 3 audio files"}, res)
	assert.Equal(t, "ro,soft", m.mounted[filepath.Join(root, id)].Options)

	assert.Equal(t, http.StatusUnprocessableEntity,
		post("/internal/mounts", map[string]any{"source_id": "../etc", "server": "nas", "export": "/m"}).Code)
	assert.Equal(t, http.StatusUnprocessableEntity,
		post("/internal/mounts/test", map[string]any{"server": "nas", "export": "/m", "options": "exec"}).Code)

	rec = post("/internal/mounts/test", map[string]any{"server": "nas", "export": "/m"})
	require.Equal(t, http.StatusOK, rec.Code)
	assert.Len(t, m.mounted, 1, "test mount is removed")
}