#include <gtest/gtest.h>

#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QTextBlock>
#include <QTextDocument>
#include <QTextFragment>

#include "panels/QuillDelta.hpp"

using namespace geopro::app;

namespace {

QJsonArray opsFromJson(const char* json) {
    return QJsonDocument::fromJson(json).array();
}

// 从 Delta ops 取第 idx 个文本 op 的 attributes（便于断言）。
QJsonObject attrsOf(const QJsonArray& ops, int idx) {
    return ops.at(idx).toObject().value(QStringLiteral("attributes")).toObject();
}

}  // namespace

// ── 反序列化（Delta → 文档）：基本行内样式落到字符格式 ──────────────────────
TEST(QuillDelta, DeltaToDocumentAppliesInlineFormats) {
    const auto ops = opsFromJson(R"([
        {"insert":"Hello","attributes":{"bold":true,"italic":true,"underline":true,
                                         "color":"#ff0000","size":"24px"}},
        {"insert":"\n"}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);

    EXPECT_EQ(doc.toPlainText(), QStringLiteral("Hello"));
    const QTextFragment frag = doc.begin().begin().fragment();
    ASSERT_TRUE(frag.isValid());
    const QTextCharFormat f = frag.charFormat();
    EXPECT_GE(f.fontWeight(), QFont::Bold);
    EXPECT_TRUE(f.fontItalic());
    EXPECT_TRUE(f.fontUnderline());
    EXPECT_EQ(f.foreground().color().name(QColor::HexRgb), QStringLiteral("#ff0000"));
    EXPECT_NEAR(f.fontPointSize(), 24.0 * 3.0 / 4.0, 0.01);  // 24px → 18pt
}

// ── 序列化（文档 → Delta）：行内样式回写 attributes ─────────────────────────
TEST(QuillDelta, DocumentToDeltaEmitsInlineAttrs) {
    QTextDocument doc;
    QTextCursor cur(&doc);
    QTextCharFormat f;
    f.setFontWeight(QFont::Bold);
    f.setForeground(QColor(QStringLiteral("#00ff00")));
    cur.insertText(QStringLiteral("World"), f);

    const QJsonArray ops = documentToDelta(doc);
    ASSERT_GE(ops.size(), 1);
    EXPECT_EQ(ops.at(0).toObject().value(QStringLiteral("insert")).toString(),
              QStringLiteral("World"));
    const QJsonObject a = attrsOf(ops, 0);
    EXPECT_TRUE(a.value(QStringLiteral("bold")).toBool());
    EXPECT_EQ(a.value(QStringLiteral("color")).toString(), QStringLiteral("#00ff00"));
}

// ── 往返：纯文本不丢、不多生成空块 ─────────────────────────────────────────
TEST(QuillDelta, RoundTripPlainTextSingleLine) {
    const auto ops = opsFromJson(R"([{"insert":"just text"},{"insert":"\n"}])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    EXPECT_EQ(doc.toPlainText(), QStringLiteral("just text"));
    EXPECT_EQ(doc.blockCount(), 1);  // 不应多出尾部空块

    const QJsonArray back = documentToDelta(doc);
    QString text;
    for (const QJsonValue& v : back)
        text += v.toObject().value(QStringLiteral("insert")).toString();
    EXPECT_EQ(text, QStringLiteral("just text\n"));
}

// ── 往返：多行 + 行内样式保持 ──────────────────────────────────────────────
TEST(QuillDelta, RoundTripMultilineWithBoldPreserved) {
    const auto ops = opsFromJson(R"([
        {"insert":"line1 "},
        {"insert":"bold","attributes":{"bold":true}},
        {"insert":"\nline2\n"}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    EXPECT_EQ(doc.toPlainText(), QStringLiteral("line1 bold\nline2"));
    EXPECT_EQ(doc.blockCount(), 2);

    // 第二趟往返稳定：重新序列化后再反序列化文本一致。
    const QJsonArray back = documentToDelta(doc);
    QTextDocument doc2;
    deltaToDocument(back, doc2);
    EXPECT_EQ(doc2.toPlainText(), QStringLiteral("line1 bold\nline2"));
    EXPECT_EQ(doc2.blockCount(), 2);
}

// ── 块级：标题落到 headingLevel 并回写 header ──────────────────────────────
TEST(QuillDelta, HeaderBlockRoundTrip) {
    const auto ops = opsFromJson(R"([
        {"insert":"Title"},
        {"insert":"\n","attributes":{"header":2}},
        {"insert":"body"},
        {"insert":"\n"}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    EXPECT_EQ(doc.begin().blockFormat().headingLevel(), 2);

    const QJsonArray back = documentToDelta(doc);
    // 找到带 header 的换行 op。
    bool found = false;
    for (const QJsonValue& v : back) {
        const QJsonObject op = v.toObject();
        if (op.value(QStringLiteral("insert")).toString() == QStringLiteral("\n") &&
            op.value(QStringLiteral("attributes")).toObject().value(QStringLiteral("header")).toInt() == 2) {
            found = true;
            break;
        }
    }
    EXPECT_TRUE(found);
}

// ── 块级：有序列表 → ListDecimal，回写 list:ordered ───────────────────────
TEST(QuillDelta, OrderedListBlockRoundTrip) {
    const auto ops = opsFromJson(R"([
        {"insert":"item"},
        {"insert":"\n","attributes":{"list":"ordered"}}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    ASSERT_NE(doc.begin().textList(), nullptr);

    const QJsonArray back = documentToDelta(doc);
    bool found = false;
    for (const QJsonValue& v : back) {
        const QJsonObject a = v.toObject().value(QStringLiteral("attributes")).toObject();
        if (a.value(QStringLiteral("list")).toString() == QStringLiteral("ordered")) {
            found = true;
            break;
        }
    }
    EXPECT_TRUE(found);
}

// ── 容错：无法识别的 attributes 降级（保留文本，不崩） ──────────────────────
TEST(QuillDelta, UnknownAttributesDegradeGracefully) {
    const auto ops = opsFromJson(R"([
        {"insert":"keepme","attributes":{"script":"super","strike":true,"link":"http://x"}},
        {"insert":"\n"}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    EXPECT_EQ(doc.toPlainText(), QStringLiteral("keepme"));
}

// ── 容错：非文本 insert（图片/嵌入对象）被丢弃，不崩 ───────────────────────
TEST(QuillDelta, NonStringInsertDropped) {
    const auto ops = opsFromJson(R"([
        {"insert":"text"},
        {"insert":{"image":"data:..."}},
        {"insert":"\n"}
    ])");
    QTextDocument doc;
    deltaToDocument(ops, doc);
    EXPECT_EQ(doc.toPlainText(), QStringLiteral("text"));
}

// ── 空 ops：空文档 ─────────────────────────────────────────────────────────
TEST(QuillDelta, EmptyOpsYieldEmptyDocument) {
    QTextDocument doc;
    deltaToDocument(QJsonArray{}, doc);
    EXPECT_TRUE(doc.toPlainText().isEmpty());
}