package tgapi

import (
	"encoding/json"
	"io"
	"mime"
	"mime/multipart"
	"reflect"
	"strings"
	"testing"
)

func TestRich103RoundTrip(t *testing.T) {
	for _, tc := range []struct {
		name, data string
		want       any
	}{
		{"inline button", `{"blocks":[{"type":"paragraph","text":{"type":"button","button":{"text":["Go",{"type":"custom_emoji","custom_emoji_id":"123","alternative_text":"!"}],"switch_inline_query":""}}}]}`, RichBlockWrap{}},
		{"button row", `{"blocks":[{"type":"buttons","align":"right","buttons":[{"text":"Go","switch_inline_query_current_chat":""},{"text":"Choose","switch_inline_query_chosen_chat":{"query":"x","allow_user_chats":true}}]}]}`, RichBlockButtons{}},
		{"expandable quote", `{"blocks":[{"type":"expandable_blockquote","text":{"type":"bold","text":"quote"},"credit":"source"}]}`, RichBlockExpandableBlockQuotation{}},
		{"document", `{"blocks":[{"type":"document","document":{"file_id":"file","file_unique_id":"unique","file_name":"notes.txt"},"caption":{"text":"Notes","credit":"Author"}}]}`, RichBlockDocument{}},
		{"compact table", `{"blocks":[{"type":"table","cells":[],"is_compact":true}]}`, RichBlockTable{}},
	} {
		t.Run(tc.name, func(t *testing.T) {
			msg, err := UnmarshalRichMessage([]byte(tc.data))
			if err != nil {
				t.Fatal(err)
			}
			if reflect.TypeOf(msg.Blocks[0]) != reflect.TypeOf(tc.want) {
				t.Fatalf("got %T", msg.Blocks[0])
			}
			data, err := json.Marshal(msg)
			if err != nil {
				t.Fatal(err)
			}
			// Compare the second decode to avoid unrelated omitted zero-value media fields.
			again, err := UnmarshalRichMessage(data)
			if err != nil {
				t.Fatal(err)
			}
			if !reflect.DeepEqual(msg, again) {
				t.Fatalf("round trip lost data: %s", data)
			}
			if strings.Contains(tc.data, `"switch_inline_query":""`) && !strings.Contains(string(data), `"switch_inline_query":""`) {
				t.Fatalf("lost empty query: %s", data)
			}
		})
	}
}

func TestRichButtonActionsRoundTrip(t *testing.T) {
	for _, action := range []string{
		`"url":"https://example.com"`, `"callback_data":"callback","style":"link"`,
		`"web_app":{"url":"https://example.com"}`, `"login_url":{"url":"https://example.com","forward_text":"Forward","request_write_access":true}`,
		`"switch_inline_query":""`, `"switch_inline_query_current_chat":""`,
		`"switch_inline_query_chosen_chat":{"allow_user_chats":true}`, `"copy_text":{"text":"Copy"}`, `"disabled":{}`,
	} {
		raw := `{"text":"Button",` + action + `}`
		var button RichMessageButton
		if err := json.Unmarshal([]byte(raw), &button); err != nil {
			t.Fatal(err)
		}
		encoded, err := json.Marshal(button)
		if err != nil {
			t.Fatal(err)
		}
		var expected, actual any
		if err := json.Unmarshal([]byte(raw), &expected); err != nil {
			t.Fatal(err)
		}
		if err := json.Unmarshal(encoded, &actual); err != nil {
			t.Fatal(err)
		}
		if !reflect.DeepEqual(expected, actual) {
			t.Fatalf("wire fields changed: %s -> %s", raw, encoded)
		}
		var again RichMessageButton
		if err := json.Unmarshal(encoded, &again); err != nil {
			t.Fatal(err)
		}
		if !reflect.DeepEqual(button, again) {
			t.Fatalf("action lost: %s", encoded)
		}
		if button.Text != RichTextPlain("Button") {
			t.Fatalf("label lost: %#v", button)
		}
	}
}

func TestRich103Malformed(t *testing.T) {
	for _, raw := range []string{
		`{"type":"button","button":{"text":null,"disabled":{}}}`,
	} {
		if _, err := UnmarshalRichText([]byte(raw)); err == nil {
			t.Fatalf("accepted %s", raw)
		}
	}
	for _, raw := range []string{
		`{"type":"buttons","buttons":[{"text":null,"disabled":{}}]}`,
		`{"type":"document","document":42}`,
	} {
		if _, err := UnmarshalRichBlock([]byte(raw)); err == nil {
			t.Fatalf("accepted %s", raw)
		}
	}
	raw := `"x"`
	for range 70 {
		raw = `{"type":"button","button":{"text":` + raw + `,"disabled":{}}}`
	}
	if _, err := UnmarshalRichText([]byte(raw)); err == nil {
		t.Fatal("accepted excessive nesting")
	}
}

func TestRichDocumentMultipart(t *testing.T) {
	params := SendRichMessage{ChatID: 42, RichMessage: InputRichMessage{
		HTML:  `<tg-document src="tg://document?id=notes"></tg-document>`,
		Media: []InputRichMessageMedia{{ID: "notes", Media: InputMedia{Type: InputMediaTypeDocument, Media: "attach://notes"}}},
	}}
	body, contentType := prepareMultipartStream([]UploaderFile{NewUploaderFile("notes.txt", []byte("hello")).SetAttachName("notes")}, params)
	defer func() { _ = body.Close() }()
	_, attrs, err := mime.ParseMediaType(contentType)
	if err != nil {
		t.Fatal(err)
	}
	reader := multipart.NewReader(body, attrs["boundary"])
	gotFile, gotMessage := false, false
	for {
		part, err := reader.NextPart()
		if err == io.EOF {
			break
		}
		if err != nil {
			t.Fatal(err)
		}
		data, err := io.ReadAll(part)
		if err != nil {
			t.Fatal(err)
		}
		switch part.FormName() {
		case "notes":
			gotFile = true
			if part.FileName() != "notes.txt" || string(data) != "hello" {
				t.Fatalf("bad file part: %s", data)
			}
		case "rich_message":
			gotMessage = true
			if !strings.Contains(string(data), `"media":"attach://notes"`) || !strings.Contains(string(data), `"type":"document"`) {
				t.Fatalf("bad rich payload: %s", data)
			}
		}
	}
	if !gotFile || !gotMessage {
		t.Fatal("missing multipart parts")
	}
}