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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package mime

import (
        "reflect"
        "testing"
)

func TestConsumeToken(t *testing.T) {
        tests := [...][3]string{
                {"foo bar", "foo", " bar"},
                {"bar", "bar", ""},
                {"", "", ""},
                {" foo", "", " foo"},
        }
        for _, test := range tests {
                token, rest := consumeToken(test[0])
                expectedToken := test[1]
                expectedRest := test[2]
                if token != expectedToken {
                        t.Errorf("expected to consume token '%s', not '%s' from '%s'",
                                expectedToken, token, test[0])
                } else if rest != expectedRest {
                        t.Errorf("expected to have left '%s', not '%s' after reading token '%s' from '%s'",
                                expectedRest, rest, token, test[0])
                }
        }
}

func TestConsumeValue(t *testing.T) {
        tests := [...][3]string{
                {"foo bar", "foo", " bar"},
                {"bar", "bar", ""},
                {" bar ", "", " bar "},
                {`"My value"end`, "My value", "end"},
                {`"My value" end`, "My value", " end"},
                {`"\\" rest`, "\\", " rest"},
                {`"My \" value"end`, "My \" value", "end"},
                {`"\" rest`, "", `"\" rest`},
        }
        for _, test := range tests {
                value, rest := consumeValue(test[0])
                expectedValue := test[1]
                expectedRest := test[2]
                if value != expectedValue {
                        t.Errorf("expected to consume value [%s], not [%s] from [%s]",
                                expectedValue, value, test[0])
                } else if rest != expectedRest {
                        t.Errorf("expected to have left [%s], not [%s] after reading value [%s] from [%s]",
                                expectedRest, rest, value, test[0])
                }
        }
}

func TestConsumeMediaParam(t *testing.T) {
        tests := [...][4]string{
                {" ; foo=bar", "foo", "bar", ""},
                {"; foo=bar", "foo", "bar", ""},
                {";foo=bar", "foo", "bar", ""},
                {";FOO=bar", "foo", "bar", ""},
                {`;foo="bar"`, "foo", "bar", ""},
                {`;foo="bar"; `, "foo", "bar", "; "},
                {`;foo="bar"; foo=baz`, "foo", "bar", "; foo=baz"},
                {` ; boundary=----CUT;`, "boundary", "----CUT", ";"},
                {` ; key=value;  blah="value";name="foo" `, "key", "value", `;  blah="value";name="foo" `},
                {`;  blah="value";name="foo" `, "blah", "value", `;name="foo" `},
                {`;name="foo" `, "name", "foo", ` `},
        }
        for _, test := range tests {
                param, value, rest := consumeMediaParam(test[0])
                expectedParam := test[1]
                expectedValue := test[2]
                expectedRest := test[3]
                if param != expectedParam {
                        t.Errorf("expected to consume param [%s], not [%s] from [%s]",
                                expectedParam, param, test[0])
                } else if value != expectedValue {
                        t.Errorf("expected to consume value [%s], not [%s] from [%s]",
                                expectedValue, value, test[0])
                } else if rest != expectedRest {
                        t.Errorf("expected to have left [%s], not [%s] after reading [%s/%s] from [%s]",
                                expectedRest, rest, param, value, test[0])
                }
        }
}

type mediaTypeTest struct {
        in string
        t  string
        p  map[string]string
}

func TestParseMediaType(t *testing.T) {
        // Convenience map initializer
        m := func(s ...string) map[string]string {
                sm := make(map[string]string)
                for i := 0; i < len(s); i += 2 {
                        sm[s[i]] = s[i+1]
                }
                return sm
        }

        nameFoo := map[string]string{"name": "foo"}
        tests := []mediaTypeTest{
                {`form-data; name="foo"`, "form-data", nameFoo},
                {` form-data ; name=foo`, "form-data", nameFoo},
                {`FORM-DATA;name="foo"`, "form-data", nameFoo},
                {` FORM-DATA ; name="foo"`, "form-data", nameFoo},
                {` FORM-DATA ; name="foo"`, "form-data", nameFoo},

                {`form-data; key=value;  blah="value";name="foo" `,
                        "form-data",
                        m("key", "value", "blah", "value", "name", "foo")},

                {`foo; key=val1; key=the-key-appears-again-which-is-bogus`,
                        "", m()},

                // From RFC 2231:
                {`application/x-stuff; title*=us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A`,
                        "application/x-stuff",
                        m("title", "This is ***fun***")},

                {`message/external-body; access-type=URL; ` +
                        `URL*0="ftp://";` +
                        `URL*1="cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar"`,
                        "message/external-body",
                        m("access-type", "URL",
                                "url", "ftp://cs.utk.edu/pub/moore/bulk-mailer/bulk-mailer.tar")},

                {`application/x-stuff; ` +
                        `title*0*=us-ascii'en'This%20is%20even%20more%20; ` +
                        `title*1*=%2A%2A%2Afun%2A%2A%2A%20; ` +
                        `title*2="isn't it!"`,
                        "application/x-stuff",
                        m("title", "This is even more ***fun*** isn't it!")},

                // Tests from http://greenbytes.de/tech/tc2231/
                // TODO(bradfitz): add the rest of the tests from that site.
                {`attachment; filename="f\oo.html"`,
                        "attachment",
                        m("filename", "foo.html")},
                {`attachment; filename="\"quoting\" tested.html"`,
                        "attachment",
                        m("filename", `"quoting" tested.html`)},
                {`attachment; filename="Here's a semicolon;.html"`,
                        "attachment",
                        m("filename", "Here's a semicolon;.html")},
                {`attachment; foo="\"\\";filename="foo.html"`,
                        "attachment",
                        m("foo", "\"\\", "filename", "foo.html")},
                {`attachment; filename=foo.html`,
                        "attachment",
                        m("filename", "foo.html")},
                {`attachment; filename=foo.html ;`,
                        "attachment",
                        m("filename", "foo.html")},
                {`attachment; filename='foo.html'`,
                        "attachment",
                        m("filename", "foo.html")},
                {`attachment; filename="foo-%41.html"`,
                        "attachment",
                        m("filename", "foo-%41.html")},
                {`attachment; filename="foo-%\41.html"`,
                        "attachment",
                        m("filename", "foo-%41.html")},
                {`filename=foo.html`,
                        "", m()},
                {`x=y; filename=foo.html`,
                        "", m()},
                {`"foo; filename=bar;baz"; filename=qux`,
                        "", m()},
                {`inline; attachment; filename=foo.html`,
                        "", m()},
                {`attachment; filename="foo.html".txt`,
                        "", m()},
                {`attachment; filename="bar`,
                        "", m()},
                {`attachment; creation-date="Wed, 12 Feb 1997 16:29:51 -0500"`,
                        "attachment",
                        m("creation-date", "Wed, 12 Feb 1997 16:29:51 -0500")},
                {`foobar`, "foobar", m()},
                {`attachment; filename* =UTF-8''foo-%c3%a4.html`,
                        "attachment",
                        m("filename", "foo-ä.html")},
                {`attachment; filename*=UTF-8''A-%2541.html`,
                        "attachment",
                        m("filename", "A-%41.html")},
                {`attachment; filename*0="foo."; filename*1="html"`,
                        "attachment",
                        m("filename", "foo.html")},
                {`attachment; filename*0*=UTF-8''foo-%c3%a4; filename*1=".html"`,
                        "attachment",
                        m("filename", "foo-ä.html")},
                {`attachment; filename*0="foo"; filename*01="bar"`,
                        "attachment",
                        m("filename", "foo")},
                {`attachment; filename*0="foo"; filename*2="bar"`,
                        "attachment",
                        m("filename", "foo")},
                {`attachment; filename*1="foo"; filename*2="bar"`,
                        "attachment", m()},
                {`attachment; filename*1="bar"; filename*0="foo"`,
                        "attachment",
                        m("filename", "foobar")},
                {`attachment; filename="foo-ae.html"; filename*=UTF-8''foo-%c3%a4.html`,
                        "attachment",
                        m("filename", "foo-ä.html")},
                {`attachment; filename*=UTF-8''foo-%c3%a4.html; filename="foo-ae.html"`,
                        "attachment",
                        m("filename", "foo-ä.html")},

                // Browsers also just send UTF-8 directly without RFC 2231,
                // at least when the source page is served with UTF-8.
                {`form-data; firstname="Брэд"; lastname="Фицпатрик"`,
                        "form-data",
                        m("firstname", "Брэд", "lastname", "Фицпатрик")},
        }
        for _, test := range tests {
                mt, params, err := ParseMediaType(test.in)
                if err != nil {
                        if test.t != "" {
                                t.Errorf("for input %q, unexpected error: %v", test.in, err)
                                continue
                        }
                        continue
                }
                if g, e := mt, test.t; g != e {
                        t.Errorf("for input %q, expected type %q, got %q",
                                test.in, e, g)
                        continue
                }
                if len(params) == 0 && len(test.p) == 0 {
                        continue
                }
                if !reflect.DeepEqual(params, test.p) {
                        t.Errorf("for input %q, wrong params.\n"+
                                "expected: %#v\n"+
                                "     got: %#v",
                                test.in, test.p, params)
                }
        }
}

func TestParseMediaTypeBogus(t *testing.T) {
        mt, params, err := ParseMediaType("bogus ;=========")
        if err == nil {
                t.Fatalf("expected an error parsing invalid media type; got type %q, params %#v", mt, params)
        }
        if err.Error() != "mime: invalid media parameter" {
                t.Errorf("expected invalid media parameter; got error %q", err)
        }
}

type formatTest struct {
        typ    string
        params map[string]string
        want   string
}

var formatTests = []formatTest{
        {"noslash", nil, ""},
        {"foo/BAR", nil, "foo/bar"},
        {"foo/BAR", map[string]string{"X": "Y"}, "foo/bar; x=Y"},
}

func TestFormatMediaType(t *testing.T) {
        for i, tt := range formatTests {
                got := FormatMediaType(tt.typ, tt.params)
                if got != tt.want {
                        t.Errorf("%d. FormatMediaType(%q, %v) = %q; want %q", i, tt.typ, tt.params, got, tt.want)
                }
        }
}