package web_test

import (
	"bytes"
	"context"
	"io"
	"log/slog"
	"net/http"
	"testing"

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

// Input that cannot be right is the caller's to fix: a 4xx, never a 500 (adversarial
// review F7). No cross-tenant oracle either way: unknown and foreign ids look the same.

func TestUploadRoutes_ANonUUIDIdIs404NotA500(t *testing.T) {
	app, _ := newUploadApp(t, audioOK, 200<<20)
	for _, path := range []string{"/uploads/not-a-uuid", "/uploads/not-a-uuid/status", "/uploads/not-a-uuid/chat", "/uploads/%00/status", "/uploads/1/status"} {
		t.Run(path, func(t *testing.T) {
			rec := do(t, app, get(path))

			assert.Equal(t, http.StatusNotFound, rec.Code)
		})
	}
}

func TestUploadPost_ATitleWithControlCharactersOrInvalidUTF8IsCleanedNotA500(t *testing.T) {
	tests := []struct{ name, title, filename string }{
		{"a NUL in the title", "Sprint\x00review", "a.m4a"},
		{"invalid UTF-8 in the title", "Sprint \xff\xfe review", "a.m4a"},
		{"a newline in the title", "Sprint\nreview", "a.m4a"},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			app, sub := newUploadApp(t, audioOK, 200<<20)

			rec := do(t, app, uploadReq(t, tt.title, tt.filename, []byte("synthetic audio bytes")))

			require.Equal(t, http.StatusSeeOther, rec.Code, "bad bytes in a cosmetic title must not fail the upload: %s", body(t, rec))
			require.Len(t, sub.jobs, 1)
			var title string
			require.NoError(t, rawPool(t).QueryRow(context.Background(), `SELECT title FROM uploaded_transcripts WHERE id = $1`, sub.jobs[0].UploadID).Scan(&title))
			assert.NotContains(t, title, "\x00")
			assert.NotContains(t, title, "\n")
			assert.True(t, len(title) > 0, "a title is still shown")
		})
	}
}

func TestUploadPost_AMalformedMultipartHeaderIsA400AndItsTextIsNotLogged(t *testing.T) {
	// A control byte in the part's file name makes the multipart body malformed. It is the
	// sender's to fix, and the parser's error quotes the header, which carries the name.
	app, sub := newUploadApp(t, audioOK, 200<<20)
	buf := &lockedBuf{}
	app.Log = slog.New(slog.NewTextHandler(buf, nil))

	rec := do(t, app, uploadReq(t, "", "zebrakaka\x00weekly.m4a", []byte("x")))

	assert.Equal(t, http.StatusBadRequest, rec.Code)
	assert.Empty(t, sub.jobs)
	assert.NotContains(t, buf.String(), "zebrakaka", "a file name is private content")
}

func TestUploadPost_ABodyCutOffInsideTheFilePartIsA400NotA500(t *testing.T) {
	app, sub := newUploadApp(t, audioOK, 200<<20)
	req := uploadReq(t, "t", "a.m4a", bytes.Repeat([]byte("a"), 4096))
	raw, err := io.ReadAll(req.Body)
	require.NoError(t, err)
	req.Body = io.NopCloser(bytes.NewReader(raw[:len(raw)-2000])) // the sender hung up mid-file
	buf := &lockedBuf{}
	app.Log = slog.New(slog.NewTextHandler(buf, nil))

	rec := do(t, app, req)

	assert.Equal(t, http.StatusBadRequest, rec.Code, "a connection that drops mid-upload is the sender's to retry, not a server fault")
	assert.Empty(t, sub.jobs)
	assert.NotContains(t, buf.String(), "level=ERROR")
}

func TestUploadPost_BidirectionalControlCharactersAreStrippedFromATitle(t *testing.T) {
	// U+202E reverses the text that follows it, so a title could render reversed on its
	// owner's own page (second adversarial review).
	app, sub := newUploadApp(t, audioOK, 200<<20)

	rec := do(t, app, uploadReq(t, "Sprint \u202Ereview \u2066x\u2069 \u200Fok", "a.m4a", []byte("x")))

	require.Equal(t, http.StatusSeeOther, rec.Code)
	var title string
	require.NoError(t, rawPool(t).QueryRow(context.Background(), `SELECT title FROM uploaded_transcripts WHERE id = $1`, sub.jobs[0].UploadID).Scan(&title))
	for _, r := range []string{"\u202E", "\u2066", "\u2069", "\u200F"} {
		assert.NotContains(t, title, r)
	}
	assert.Contains(t, title, "Sprint")
	assert.Contains(t, title, "review")
}

func TestUploadPost_SwedishLettersAndEmojiSurviveTheTitleCleaning(t *testing.T) {
	app, sub := newUploadApp(t, audioOK, 200<<20)

	// Includes a ZWJ sequence (woman + ZWJ + laptop) and a ZWNJ: joiners are not direction controls.
	rec := do(t, app, uploadReq(t, "Möte åäö 🎙️ 👩\u200d💻 a\u200cb", "a.m4a", []byte("x")))

	require.Equal(t, http.StatusSeeOther, rec.Code)
	var title string
	require.NoError(t, rawPool(t).QueryRow(context.Background(), `SELECT title FROM uploaded_transcripts WHERE id = $1`, sub.jobs[0].UploadID).Scan(&title))
	assert.Equal(t, "Möte åäö 🎙️ 👩\u200d💻 a\u200cb", title, "joiners and variation selectors belong to the text")
}