package cli

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

	"github.com/spf13/afero"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"sneak.berlin/go/mfer/mfer"
)

// buildTestManifest creates a manifest from in-memory files and returns its bytes.
func buildTestManifest(t *testing.T, files map[string][]byte) []byte {
	t.Helper()
	sourceFs := afero.NewMemMapFs()
	for path, content := range files {
		require.NoError(t, sourceFs.MkdirAll("/", 0o755))
		require.NoError(t, afero.WriteFile(sourceFs, "/"+path, content, 0o644))
	}

	opts := &mfer.ScannerOptions{Fs: sourceFs}
	s := mfer.NewScannerWithOptions(opts)
	require.NoError(t, s.EnumerateFS(sourceFs, "/", nil))

	var buf bytes.Buffer
	require.NoError(t, s.ToManifest(context.Background(), &buf, nil))
	return buf.Bytes()
}

func TestExportManifestOperation(t *testing.T) {
	testFiles := map[string][]byte{
		"hello.txt":    []byte("Hello, World!"),
		"sub/file.txt": []byte("nested content"),
	}
	manifestData := buildTestManifest(t, testFiles)

	// Write manifest to memfs
	fs := afero.NewMemMapFs()
	require.NoError(t, afero.WriteFile(fs, "/test.mf", manifestData, 0o644))

	var stdout, stderr bytes.Buffer
	exitCode := RunWithOptions(&RunOptions{
		Appname: "mfer",
		Args:    []string{"mfer", "export", "/test.mf"},
		Stdin:   &bytes.Buffer{},
		Stdout:  &stdout,
		Stderr:  &stderr,
		Fs:      fs,
	})

	require.Equal(t, 0, exitCode, "stderr: %s", stderr.String())

	var entries []ExportEntry
	require.NoError(t, json.Unmarshal(stdout.Bytes(), &entries))
	assert.Len(t, entries, 2)

	// Verify entries have expected fields
	pathSet := make(map[string]bool)
	for _, e := range entries {
		pathSet[e.Path] = true
		assert.NotEmpty(t, e.Hashes, "entry %s should have hashes", e.Path)
		assert.Greater(t, e.Size, int64(0), "entry %s should have positive size", e.Path)
	}
	assert.True(t, pathSet["hello.txt"])
	assert.True(t, pathSet["sub/file.txt"])
}

func TestExportFromHTTPURL(t *testing.T) {
	testFiles := map[string][]byte{
		"a.txt": []byte("aaa"),
	}
	manifestData := buildTestManifest(t, testFiles)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/octet-stream")
		_, _ = w.Write(manifestData)
	}))
	defer server.Close()

	var stdout, stderr bytes.Buffer
	exitCode := RunWithOptions(&RunOptions{
		Appname: "mfer",
		Args:    []string{"mfer", "export", server.URL + "/index.mf"},
		Stdin:   &bytes.Buffer{},
		Stdout:  &stdout,
		Stderr:  &stderr,
		Fs:      afero.NewMemMapFs(),
	})

	require.Equal(t, 0, exitCode, "stderr: %s", stderr.String())

	var entries []ExportEntry
	require.NoError(t, json.Unmarshal(stdout.Bytes(), &entries))
	assert.Len(t, entries, 1)
	assert.Equal(t, "a.txt", entries[0].Path)
}

func TestListFromHTTPURL(t *testing.T) {
	testFiles := map[string][]byte{
		"one.txt": []byte("1"),
		"two.txt": []byte("22"),
	}
	manifestData := buildTestManifest(t, testFiles)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write(manifestData)
	}))
	defer server.Close()

	var stdout, stderr bytes.Buffer
	exitCode := RunWithOptions(&RunOptions{
		Appname: "mfer",
		Args:    []string{"mfer", "list", server.URL + "/index.mf"},
		Stdin:   &bytes.Buffer{},
		Stdout:  &stdout,
		Stderr:  &stderr,
		Fs:      afero.NewMemMapFs(),
	})

	require.Equal(t, 0, exitCode, "stderr: %s", stderr.String())
	output := stdout.String()
	assert.Contains(t, output, "one.txt")
	assert.Contains(t, output, "two.txt")
}

func TestIsHTTPURL(t *testing.T) {
	assert.True(t, isHTTPURL("http://example.com/manifest.mf"))
	assert.True(t, isHTTPURL("https://example.com/manifest.mf"))
	assert.False(t, isHTTPURL("/local/path.mf"))
	assert.False(t, isHTTPURL("relative/path.mf"))
	assert.False(t, isHTTPURL("ftp://example.com/file"))
}