"""程序化字段映射单元测试。

测试 _programmatic_map_fields 和 _sanitize_field_name
的确定性替换行为，以及 validate_element_count 校验。
"""

from __future__ import annotations

import pytest
from agent.nodes import _programmatic_map_fields, _sanitize_field_name
from agent.jrxml_windower import count_elements, validate_element_count

# ── 最小 JRXML 模板（含占位字段）────────────────────────────────────

JRXML_WITH_PLACEHOLDERS = """<?xml version="1.0" encoding="UTF-8"?>
<jasperReport name="test" pageWidth="595" pageHeight="842">
    <field name="field_1" class="java.lang.String"/>
    <field name="field_2" class="java.math.BigDecimal"/>
    <field name="field_3" class="java.lang.String"/>
    <queryString><![CDATA[SELECT * FROM t]]></queryString>
    <title>
        <band height="50">
            <staticText>
                <reportElement x="0" y="0" width="100" height="20"/>
                <text><![CDATA[$F{field_1}]]></text>
            </staticText>
            <textField>
                <reportElement x="100" y="0" width="80" height="20"/>
                <textFieldExpression><![CDATA[$F{field_2}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="200" y="0" width="80" height="20"/>
                <textFieldExpression><![CDATA[$F{field_3}]]></textFieldExpression>
            </textField>
        </band>
    </title>
    <detail>
        <band height="30">
            <textField>
                <reportElement x="0" y="0" width="100" height="20"/>
                <textFieldExpression><![CDATA[$F{field_1} + " " + $F{field_2}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
</jasperReport>"""


# ── _sanitize_field_name 测试 ────────────────────────────────────────

class TestSanitizeFieldName:
    def test_ascii_name_passes_through(self):
        assert _sanitize_field_name("customer_name") == "customer_name"

    def test_uppercase_lowered(self):
        assert _sanitize_field_name("CustomerName") == "customername"

    def test_spaces_replaced(self):
        assert _sanitize_field_name("customer name") == "customer_name"

    def test_chinese_characters_escaped(self):
        result = _sanitize_field_name("发票代码")
        assert "发票" not in result
        assert "u53d1_" in result
        assert "u7968_" in result

    def test_mixed_ascii_chinese(self):
        result = _sanitize_field_name("发票_code")
        assert "_code" in result
        assert "u53d1_" in result

    def test_empty_returns_unnamed(self):
        assert _sanitize_field_name("") == "unnamed_field"

    def test_all_special_chars_returns_unnamed(self):
        assert _sanitize_field_name("!!!") == "unnamed_field"

    def test_leading_digit_prefixed(self):
        result = _sanitize_field_name("123abc")
        assert result == "f_123abc"

    def test_consecutive_underscores_collapsed(self):
        result = _sanitize_field_name("a__b___c")
        assert result == "a_b_c"

    def test_japanese_characters_escaped(self):
        result = _sanitize_field_name("請求書")
        assert "請求" not in result


# ── _programmatic_map_fields 测试 ────────────────────────────────────

class TestProgrammaticMapFields:
    def test_replaces_field_declarations(self):
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
            {"field_name": "invoice_date"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert 'field name="customer_name"' in result
        assert 'field name="total_amount"' in result
        assert 'field name="invoice_date"' in result
        assert 'field name="field_1"' not in result

    def test_replaces_field_references(self):
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
            {"field_name": "invoice_date"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert "$F{field_1}" not in result
        assert "$F{customer_name}" in result
        assert "$F{total_amount}" in result
        assert "$F{invoice_date}" in result

    def test_preserves_element_count(self):
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
            {"field_name": "invoice_date"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        orig = count_elements(JRXML_WITH_PLACEHOLDERS)
        mod = count_elements(result)
        assert orig == mod, f"Elements: {orig} -> {mod}"

    def test_preserves_coordinates(self):
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
            {"field_name": "invoice_date"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert 'x="0"' in result
        assert 'x="100"' in result
        assert 'x="200"' in result
        assert 'y="0"' in result
        assert 'width="100"' in result
        assert 'height="20"' in result

    def test_partial_fields_preserved(self):
        """当 OCR 字段少于占位字段时，多余占位字段保留。"""
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert 'field name="field_3"' in result
        assert "$F{field_3}" in result

    def test_empty_field_name_skipped(self):
        """空 field_name 的 OCR 字段不触发替换。"""
        ocr = [
            {"field_name": ""},
            {"field_name": "total_amount"},
            {"field_name": ""},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert '$F{field_1}' in result
        assert '$F{total_amount}' in result
        assert '$F{field_3}' in result

    def test_no_ocr_fields_no_change(self):
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, [])
        assert result == JRXML_WITH_PLACEHOLDERS

    def test_chinese_field_names_sanitized(self):
        ocr = [
            {"field_name": "发票代码"},
            {"field_name": "发票号码"},
            {"field_name": "金额"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert "发票代码" not in result

    def test_validate_element_count_passes(self):
        ocr = [
            {"field_name": "customer_name"},
            {"field_name": "total_amount"},
            {"field_name": "invoice_date"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        validation = validate_element_count(
            JRXML_WITH_PLACEHOLDERS, result, "map_fields"
        )
        assert validation["ok"] is True
        assert validation["modified"] == validation["original"]

    def test_expression_with_multiple_fields(self):
        """包含多个 $F{} 的表达式正确替换。"""
        ocr = [
            {"field_name": "unit_price"},
            {"field_name": "quantity"},
        ]
        result = _programmatic_map_fields(JRXML_WITH_PLACEHOLDERS, ocr)
        assert '$F{unit_price}' in result
        assert '$F{quantity}' in result
        assert '$F{field_1}' not in result
        assert '$F{field_2}' not in result