File size: 4,665 Bytes
7ff7119 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | """compare_documents tool — compare two (or auto-detected three) documents.
Behavior:
1. If the two documents are part of an invoice + delivery_note + purchase_order
triplet, automatically locates the third and runs ``three_way_match()``.
2. Otherwise runs ``compare_two_documents()`` on the matching fields.
Uses ``validation/compare.py`` for the underlying 4-pass item matching,
apples-to-apples amount comparison, and tolerance tiers.
"""
from __future__ import annotations
from langchain_core.tools import tool
from tools.context import ChatToolContext
from validation.compare import compare_two_documents, three_way_match
def _format_report(result, header: str, sources: list[str]) -> str:
"""ComparisonResult → user-friendly text."""
lines = [
f"Total: {result.total_checks} checks, "
f"{result.ok_count} OK, {result.warning_count} warnings, "
f"{result.critical_count} critical, {result.missing_count} missing",
]
for m in result.matches:
if m.severity != "ok":
lines.append(f" [{m.severity.upper()}] {m.message}")
if result.ok_count == result.total_checks:
lines.append(" All checks passed.")
body = "\n".join(lines)
src = f"[Source: {', '.join(sources)}]"
return f"{header}\n{body}\n\n{src}"
def build_compare_documents_tool(ctx: ChatToolContext):
@tool
def compare_documents(filename_a: str, filename_b: str) -> str:
"""Compare the extracted data of two documents.
Compares amounts, line items, and dates and reports discrepancies.
If the two documents are part of an invoice + delivery_note +
purchase_order triplet, automatically locates the third document
and runs three-way matching.
Args:
filename_a: filename of the first document
filename_b: filename of the second document
"""
pd_a = ctx.get_document(filename_a)
pd_b = ctx.get_document(filename_b)
if pd_a is None or pd_b is None:
missing = []
if pd_a is None:
missing.append(filename_a)
if pd_b is None:
missing.append(filename_b)
return f"Not found: {', '.join(missing)}. Available: {ctx.list_filenames()}"
a_raw = pd_a.extracted.raw if pd_a.extracted else {}
b_raw = pd_b.extracted.raw if pd_b.extracted else {}
type_a = pd_a.classification.doc_type if pd_a.classification else ""
type_b = pd_b.classification.doc_type if pd_b.classification else ""
types_set = {type_a, type_b}
# If two of {invoice, delivery_note, purchase_order}, find the third
triplet_types = {"invoice", "delivery_note", "purchase_order"}
if types_set <= triplet_types and len(types_set) == 2:
needed = triplet_types - types_set
needed_type = needed.pop()
third_filenames = [
fn for fn in ctx.list_filenames()
if (pd := ctx.get_document(fn)) is not None
and pd.classification is not None
and pd.classification.doc_type == needed_type
]
if third_filenames:
pd_third = ctx.get_document(third_filenames[0])
if pd_third is not None and pd_third.extracted is not None:
docs_by_type = {
type_a: a_raw,
type_b: b_raw,
needed_type: pd_third.extracted.raw,
}
result = three_way_match(
invoice=docs_by_type["invoice"],
delivery_note=docs_by_type["delivery_note"],
purchase_order=docs_by_type["purchase_order"],
)
return _format_report(
result,
header=(
f"Three-way matching: invoice + delivery_note + purchase_order "
f"({filename_a}, {filename_b}, {third_filenames[0]})"
),
sources=[filename_a, filename_b, third_filenames[0]],
)
# Otherwise plain 2-doc compare on union of fields
all_fields = list(set(a_raw.keys()) | set(b_raw.keys()))
all_fields = [f for f in all_fields if not f.startswith("_")]
result = compare_two_documents(a_raw, b_raw, all_fields)
return _format_report(
result,
header=f"Compare: {filename_a} vs {filename_b}",
sources=[filename_a, filename_b],
)
return compare_documents
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