from __future__ import annotations

from src.domain import MAX_BYTES, MAX_CHARS, MAX_DOCS, MAX_FILES, MAX_PAGES
from src.schemas import LabDocument, ValidationReport


def validate_text(name: str, text: str, report: ValidationReport) -> None:
    if text is None:
        report.add("empty", "Text is missing.", name)
        return
    if len(text) > MAX_CHARS:
        report.add("too_large_text", f"Text exceeds {MAX_CHARS} characters.", name)
    if "\x00" in text:
        report.add("binary", "Binary content is out of scope.", name)
    lowered = text.lower()
    if "begin private key" in lowered or "aws_secret_access_key" in lowered:
        report.add("credential_rejected", "Live credentials are not accepted in the public demo.", name)


def validate_documents(documents: list[LabDocument]) -> ValidationReport:
    report = ValidationReport(ok=True)
    if not documents:
        report.add("empty", "No laboratory document is selected.", "documents")
        return report
    if len(documents) > MAX_DOCS:
        report.add("too_many_docs", f"At most {MAX_DOCS} documents are scored.", "documents")
    total = 0
    for item in documents:
        validate_text(item.doc_id, item.body, report)
        total += len(item.body.encode("utf-8", errors="replace"))
    if total > MAX_BYTES:
        report.add("too_large", f"Corpus exceeds {MAX_BYTES} bytes.", "documents")
    return report


def validate_limits(n_files: int, pages: int, chars: int, report: ValidationReport) -> None:
    if n_files > MAX_FILES:
        report.add("too_many_files", f"At most {MAX_FILES} uploads.", "uploads")
    if pages > MAX_PAGES:
        report.add("too_many_pages", f"PDFs are limited to {MAX_PAGES} pages.", "pdf")
    if chars > MAX_CHARS:
        report.add("too_large_text", f"Combined text exceeds {MAX_CHARS} characters.", "text")