//go:build embed
// +build embed

package site_test

import (
	"context"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"testing"
	"testing/fstest"
	"time"

	"github.com/stretchr/testify/require"

	"github.com/coder/coder/site"
)

func TestCaching(t *testing.T) {
	t.Parallel()

	// Create a test server
	rootFS := fstest.MapFS{
		"bundle.js":        &fstest.MapFile{},
		"image.png":        &fstest.MapFile{},
		"static/image.png": &fstest.MapFile{},
		"favicon.ico": &fstest.MapFile{
			Data: []byte("folderFile"),
		},

		"service-worker.js": &fstest.MapFile{},
		"index.html": &fstest.MapFile{
			Data: []byte("folderFile"),
		},
		"terminal.html": &fstest.MapFile{
			Data: []byte("folderFile"),
		},
	}

	srv := httptest.NewServer(site.Handler(rootFS))
	defer srv.Close()

	// Create a context
	ctx, cancelFunc := context.WithTimeout(context.Background(), 1*time.Second)
	defer cancelFunc()

	testCases := []struct {
		path             string
		isExpectingCache bool
	}{
		{"/bundle.js", true},
		{"/image.png", true},
		{"/static/image.png", true},
		{"/favicon.ico", true},

		{"/", false},
		{"/service-worker.js", false},
		{"/index.html", false},
		{"/double/nested/terminal.html", false},
	}

	for _, testCase := range testCases {
		req, err := http.NewRequestWithContext(ctx, http.MethodGet, srv.URL+testCase.path, nil)
		require.NoError(t, err, "create request")

		res, err := srv.Client().Do(req)
		require.NoError(t, err, "get index")

		cache := res.Header.Get("Cache-Control")
		if testCase.isExpectingCache {
			require.Equalf(t, "public, max-age=31536000, immutable", cache, "expected %w file to have immutable cache", testCase.path)
		} else {
			require.Equalf(t, "", cache, "expected %w file to not have immutable cache header", testCase.path)
		}

		require.NoError(t, res.Body.Close(), "closing response")
	}
}

func TestServingFiles(t *testing.T) {
	t.Parallel()

	// Create a test server
	rootFS := fstest.MapFS{
		"index.html": &fstest.MapFile{
			Data: []byte("index-bytes"),
		},
		"favicon.ico": &fstest.MapFile{
			Data: []byte("favicon-bytes"),
		},
		"dashboard.js": &fstest.MapFile{
			Data: []byte("dashboard-js-bytes"),
		},
		"dashboard.css": &fstest.MapFile{
			Data: []byte("dashboard-css-bytes"),
		},
	}

	srv := httptest.NewServer(site.Handler(rootFS))
	defer srv.Close()

	// Create a context
	ctx, cancelFunc := context.WithTimeout(context.Background(), 1*time.Second)
	defer cancelFunc()

	var testCases = []struct {
		path     string
		expected string
	}{
		// Index cases
		{"/", "index-bytes"},
		{"/index.html", "index-bytes"},
		{"/nested", "index-bytes"},
		{"/nested/", "index-bytes"},
		{"/nested/index.html", "index-bytes"},

		// These are nested paths that should lead back to index. We don't
		// allow nested JS or CSS files.
		{"/double/nested", "index-bytes"},
		{"/double/nested/", "index-bytes"},
		{"/double/nested/index.html", "index-bytes"},
		{"/nested/dashboard.js", "index-bytes"},
		{"/nested/dashboard.css", "index-bytes"},
		{"/double/nested/dashboard.js", "index-bytes"},
		{"/double/nested/dashboard.css", "index-bytes"},

		// Favicon cases
		// The favicon is always root-referenced in index.html:
		{"/favicon.ico", "favicon-bytes"},

		// JS, CSS cases
		{"/dashboard.js", "dashboard-js-bytes"},
		{"/dashboard.css", "dashboard-css-bytes"},
	}

	for _, testCase := range testCases {
		path := srv.URL + testCase.path

		req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
		require.NoError(t, err)
		resp, err := http.DefaultClient.Do(req)
		require.NoError(t, err, "get file")
		data, _ := io.ReadAll(resp.Body)
		require.Equal(t, string(data), testCase.expected, "Verify file: "+testCase.path)
		err = resp.Body.Close()
		require.NoError(t, err)
	}
}

func TestShouldCacheFile(t *testing.T) {
	t.Parallel()

	var testCases = []struct {
		reqFile  string
		expected bool
	}{
		{"123456789.js", true},
		{"apps/app/code/terminal.css", true},
		{"image.png", true},
		{"static/image.png", true},
		{"static/images/section-a/image.jpeg", true},

		{"service-worker.js", false},
		{"dashboard.html", false},
		{"apps/app/code/terminal.html", false},
	}

	for _, testCase := range testCases {
		got := site.ShouldCacheFile(testCase.reqFile)
		require.Equal(t, testCase.expected, got, fmt.Sprintf("Expected ShouldCacheFile(%s) to be %t", testCase.reqFile, testCase.expected))
	}
}