"""
Generate the FCC Form 499-A Reseller Certification Attestation.

Produces a DOCX that a filer sends to its reseller customer for the
reseller's authorized officer to sign.  The signed attestation
establishes that the purchased service is being resold into a
telecommunications or interconnected VoIP offering, and that USF
contribution is flowing (per 2026 Form 499-A Section IV.C.4).

The sample certification text is reproduced verbatim from
``site/src/lib/fcc_constants.ts::RESELLER_CERTIFICATION_SAMPLE_TEXT``
and mirrored in the constant ``RESELLER_CERTIFICATION_SAMPLE_TEXT``
below.  If upstream source text changes, update both locations.

Usage:
    from scripts.document_gen.templates.reseller_cert_attestation_generator import (
        generate_reseller_cert_attestation,
    )
    path = generate_reseller_cert_attestation(
        output_path="/tmp/reseller_cert.docx",
        filer_legal_name="Acme Telco LLC",
        filer_filer_id_499="812345",
        reseller_legal_name="Beta Reseller Corp",
        reseller_filer_id_499="812999",
        reporting_year=2025,
    )
"""
from __future__ import annotations

import logging
from datetime import datetime
from pathlib import Path
from typing import Optional

LOG = logging.getLogger("document_gen.reseller_cert_attestation")

try:
    from docx import Document
    from docx.shared import Pt, Inches, RGBColor
    from docx.enum.text import WD_ALIGN_PARAGRAPH
except ImportError:
    LOG.warning("python-docx not installed — reseller cert attestation unavailable")
    Document = None  # type: ignore[assignment,misc]

_NAVY = RGBColor(0x1A, 0x27, 0x44) if Document else None

# Verbatim from site/src/lib/fcc_constants.ts (RESELLER_CERTIFICATION_SAMPLE_TEXT).
RESELLER_CERTIFICATION_SAMPLE_TEXT = (
    "I certify under penalty of perjury that the company is purchasing "
    "service(s) for resale, at least in part, and that the company is "
    "incorporating the purchased services into its own offerings which "
    "are, at least in part, assessable U.S. telecommunications or "
    "interconnected Voice over Internet Protocol services. I also "
    "certify under penalty of perjury that the company either directly "
    "contributes or has a reasonable expectation that another entity in "
    "the downstream chain of resellers directly contributes to the "
    "federal universal service support mechanisms on the assessable "
    "portion of revenues from offerings that incorporate the purchased "
    "services."
)


def _sp(p, after=6, before=0):
    p.paragraph_format.space_after = Pt(after)
    if before:
        p.paragraph_format.space_before = Pt(before)


def _h(doc, text):
    p = doc.add_paragraph(); r = p.add_run(text)
    r.font.size = Pt(12); r.bold = True; r.font.color.rgb = _NAVY
    _sp(p, after=4, before=8)


def _b(doc, text, bold=False, size=10):
    p = doc.add_paragraph(); p.alignment = WD_ALIGN_PARAGRAPH.LEFT
    r = p.add_run(text); r.font.size = Pt(size); r.bold = bold
    _sp(p, after=6)


def generate_reseller_cert_attestation(
    output_path: str,
    filer_legal_name: str,
    filer_filer_id_499: str,
    reseller_legal_name: str,
    reseller_filer_id_499: str = "",
    reporting_year: int = 0,
    effective_date: str = "",
    filer_contact_name: str = "",
    filer_contact_email: str = "",
    filer_contact_phone: str = "",
    **_: dict,
) -> Optional[str]:
    """
    Produce the Reseller Certification Attestation DOCX for signature
    by the reseller's authorized officer.
    """
    if Document is None:
        LOG.error("python-docx not installed")
        return None

    if reporting_year == 0:
        reporting_year = datetime.now().year
    effective = effective_date or datetime.now().strftime("%B %d, %Y")

    doc = Document()
    for s in doc.sections:
        s.top_margin = Inches(1); s.bottom_margin = Inches(1)
        s.left_margin = Inches(1.25); s.right_margin = Inches(1.25)

    # Title
    tp = doc.add_paragraph(); tp.alignment = WD_ALIGN_PARAGRAPH.CENTER
    t = tp.add_run("Reseller Certification Attestation")
    t.font.size = Pt(15); t.bold = True; t.font.color.rgb = _NAVY
    _sp(tp, after=2)

    sp = doc.add_paragraph(); sp.alignment = WD_ALIGN_PARAGRAPH.CENTER
    s = sp.add_run(
        f"FCC Form 499-A Section IV.C.4  \u2014  Reporting Year {reporting_year}"
    )
    s.font.size = Pt(10); s.font.color.rgb = RGBColor(0x55, 0x55, 0x55)
    _sp(sp, after=8)

    # ── 1. Parties ────────────────────────────────────────────────
    _h(doc, "1. Parties")
    _b(doc, (
        f"Filer (upstream wholesaler): {filer_legal_name}"
        + (f"  |  Filer 499 ID: {filer_filer_id_499}" if filer_filer_id_499 else "")
    ))
    _b(doc, (
        f"Reseller (purchaser): {reseller_legal_name}"
        + (f"  |  Filer 499 ID: {reseller_filer_id_499}"
           if reseller_filer_id_499 else "  |  Filer 499 ID: _______________")
    ))
    _b(doc, f"Effective Reporting Year: {reporting_year}")
    _b(doc, f"Date of Attestation: {effective}")

    # ── 2. Purpose ────────────────────────────────────────────────
    _h(doc, "2. Purpose")
    _b(doc, (
        f"Pursuant to Section IV.C.4 of the FCC Form 499-A Instructions "
        f"({reporting_year}), {filer_legal_name} is required to obtain from "
        f"{reseller_legal_name} a signed certification that the services "
        f"purchased by the reseller are being incorporated into assessable "
        f"U.S. telecommunications or interconnected Voice over Internet "
        f"Protocol offerings, and that federal universal-service "
        f"contributions are flowing on those resold services. This "
        f"Attestation satisfies that requirement."
    ))

    # ── 3. Certification Language (verbatim) ──────────────────────
    _h(doc, "3. Certification")
    _b(doc, RESELLER_CERTIFICATION_SAMPLE_TEXT)

    # ── 4. Annual Renewal Notice ──────────────────────────────────
    _h(doc, "4. Annual Renewal")
    _b(doc, (
        "This Attestation is effective for the reporting year stated "
        f"above and must be renewed annually.  {filer_legal_name} will "
        f"request an updated, signed Attestation from {reseller_legal_name} "
        f"on or about January 1 of each subsequent reporting year.  A "
        f"current signed Attestation must be on file at the time "
        f"{filer_legal_name} submits its Form 499-A for the reporting "
        f"year."
    ))

    # ── 5. Reseller Authorized Officer Signature ──────────────────
    _h(doc, "5. Signature — Reseller Authorized Officer")
    _b(doc, (
        f"By signing below, the undersigned officer of {reseller_legal_name} "
        f"certifies that he or she is an authorized officer of the company, "
        f"has personal knowledge of the matters certified above, and "
        f"executes this Attestation on behalf of the company."
    ))

    # Blank signature block
    sig = doc.add_paragraph(); sig.add_run("_" * 55).font.size = Pt(10)
    _sp(sig, after=2)

    nm = doc.add_paragraph()
    nm.add_run("Name (printed): ").font.size = Pt(10)
    nm.add_run("_" * 40).font.size = Pt(10)
    _sp(nm, after=4)

    tt = doc.add_paragraph()
    tt.add_run("Title: ").font.size = Pt(10)
    tt.add_run("_" * 48).font.size = Pt(10)
    _sp(tt, after=4)

    co = doc.add_paragraph()
    co.add_run("Company: ").font.size = Pt(10)
    co.add_run(reseller_legal_name).font.size = Pt(10)
    _sp(co, after=4)

    dt = doc.add_paragraph()
    dt.add_run("Date: ").font.size = Pt(10)
    dt.add_run("_" * 20).font.size = Pt(10)
    _sp(dt, after=10)

    # ── 6. Filer Contact (for returning the signed form) ──────────
    _h(doc, "6. Return Signed Attestation To")
    _b(doc, filer_legal_name)
    if filer_contact_name:
        _b(doc, f"Attention: {filer_contact_name}")
    if filer_contact_email:
        _b(doc, f"Email: {filer_contact_email}")
    if filer_contact_phone:
        _b(doc, f"Phone: {filer_contact_phone}")

    out = Path(output_path)
    out.parent.mkdir(parents=True, exist_ok=True)
    doc.save(str(out))
    LOG.info("Reseller Certification Attestation generated: %s", out)
    return str(out)