"""
Reusable cover-page generator for transcript and summary DOCX files.

Configuration (env):
- COVER_PAGE_ENABLED: "true"/"false" (default: false)
- COVER_PAGE_ORGANIZATION: e.g., "A.P.Strom"
- COVER_PAGE_TITLE_PREFIX: e.g., "TRANSCRIPT" or "SUMMARY"
- COVER_PAGE_LOGO_URL: optional URL
- COVER_PAGE_LOGO_PATH: optional local path
"""

import os
from typing import Optional
from docx import Document
from docx.shared import Pt, Inches
from docx.enum.text import WD_ALIGN_PARAGRAPH
from docx.oxml import OxmlElement
from docx.oxml.ns import qn


def _add_page_break(doc: Document):
    """Insert a page break paragraph."""
    p = doc.add_paragraph()
    pPr = p._p.get_or_add_pPr()
    # Clear spacing/tabs
    for child in list(pPr):
        tag = child.tag.split("}")[-1] if "}" in child.tag else child.tag
        if tag in ("tabs", "spacing", "ind"):
            pPr.remove(child)
    page_break = OxmlElement("w:pageBreak")
    page_break.set("{http://schemas.openxmlformats.org/wordprocessingml/2006/main}val", "1")
    pPr.append(page_break)


def add_cover_page(
    doc: Document,
    title: str,
    subtitle: Optional[str] = None,
    metadata: Optional[dict] = None,
    include_logo: bool = False,
):
    """
    Insert a cover page at the current cursor position.

    - title: e.g., "TRANSCRIPT" or "SUMMARY"
    - subtitle: e.g., "Meeting of 16 June 2026"
    - metadata: optional dict with keys like:
        - "Organization"
        - "Date"
        - "Prepared by"
        - "Reference"
    """

    org = (os.getenv("COVER_PAGE_ORGANIZATION") or "").strip() or metadata.get("Organization") if metadata else None
    date = (metadata.get("Date") if metadata else None) or ""
    prepared_by = (metadata.get("Prepared by") if metadata else None) or ""
    reference = (metadata.get("Reference") if metadata else None) or ""

    # Title
    p = doc.add_paragraph()
    p.alignment = WD_ALIGN_PARAGRAPH.CENTER
    p.paragraph_format.space_after = Pt(6)
    run = p.add_run(title.upper())
    run.bold = True
    run.font.name = "Courier"
    run.font.size = Pt(18)

    # Subtitle
    if subtitle:
        p = doc.add_paragraph()
        p.alignment = WD_ALIGN_PARAGRAPH.CENTER
        p.paragraph_format.space_after = Pt(12)
        run = p.add_run(subtitle)
        run.font.name = "Courier"
        run.font.size = Pt(14)

    # Optional logo placeholder (text-only for now; can be extended)
    if include_logo:
        logo_url = (os.getenv("COVER_PAGE_LOGO_URL") or "").strip()
        logo_path = (os.getenv("COVER_PAGE_LOGO_PATH") or "").strip()
        # For now, just reserve space; image insertion can be added later.
        p = doc.add_paragraph()
        p.alignment = WD_ALIGN_PARAGRAPH.CENTER
        p.paragraph_format.space_after = Pt(12)

    # Metadata lines
    if org or date or prepared_by or reference:
        p = doc.add_paragraph()
        p.alignment = WD_ALIGN_PARAGRAPH.CENTER
        p.paragraph_format.space_after = Pt(4)
        if org:
            r = p.add_run(org)
            r.font.name = "Courier"
            r.font.size = Pt(12)
        if date:
            if org:
                p.add_run("\n")
            r = p.add_run(date)
            r.font.name = "Courier"
            r.font.size = Pt(12)

        if prepared_by or reference:
            p = doc.add_paragraph()
            p.alignment = WD_ALIGN_PARAGRAPH.CENTER
            p.paragraph_format.space_after = Pt(4)
            if prepared_by:
                r = p.add_run(f"Prepared by: {prepared_by}")
                r.font.name = "Courier"
                r.font.size = Pt(11)
            if reference:
                if prepared_by:
                    p.add_run("\n")
                r = p.add_run(f"Reference: {reference}")
                r.font.name = "Courier"
                r.font.size = Pt(11)

    # Page break after cover page
    _add_page_break(doc)