"""
Export supervision notes and CPD logs to .docx format.
"""
from datetime import date
from io import BytesIO

HAS_DOCX = False
try:
    from docx import Document
    from docx.shared import Pt, RGBColor, Inches
    from docx.enum.text import WD_ALIGN_PARAGRAPH
    HAS_DOCX = True
except ImportError:
    pass


def build_supervision_docx(note_text: str, nurse_name: str = "") -> bytes | None:
    """Build a formatted .docx supervision note."""
    if not HAS_DOCX:
        return None

    doc = Document()

    # Header
    header_para = doc.add_paragraph()
    header_para.alignment = WD_ALIGN_PARAGRAPH.CENTER
    run = header_para.add_run("Professional Nurse Advocate Assistant")
    run.bold = True
    run.font.size = Pt(16)
    run.font.color.rgb = RGBColor(0x1a, 0x24, 0x60)  # brand navy

    sub = doc.add_paragraph()
    sub.alignment = WD_ALIGN_PARAGRAPH.CENTER
    sub.add_run("A-EQUIP Model Supervision Note").italic = True

    doc.add_paragraph()

    # Metadata
    meta = doc.add_paragraph()
    meta.add_run(f"Date: ").bold = True
    meta.add_run(date.today().strftime("%d %B %Y"))

    if nurse_name:
        nurse_p = doc.add_paragraph()
        nurse_p.add_run("Name: ").bold = True
        nurse_p.add_run(nurse_name)

    doc.add_paragraph()

    # Note content — parse markdown-ish headings
    for line in note_text.split("\n"):
        line = line.strip()
        if not line:
            doc.add_paragraph()
            continue

        if line.startswith("## "):
            h = doc.add_heading(line[3:], level=2)
            for run in h.runs:
                run.font.color.rgb = RGBColor(0x1a, 0x24, 0x60)
        elif line.startswith("### "):
            h = doc.add_heading(line[4:], level=3)
            for run in h.runs:
                run.font.color.rgb = RGBColor(0x0d, 0x94, 0x88)  # teal
        elif line.startswith("**") and line.endswith("**"):
            p = doc.add_paragraph()
            p.add_run(line.strip("**")).bold = True
        elif line.startswith("- "):
            doc.add_paragraph(line[2:], style="List Bullet")
        else:
            doc.add_paragraph(line)

    # Footer
    doc.add_paragraph()
    footer = doc.add_paragraph()
    footer.alignment = WD_ALIGN_PARAGRAPH.CENTER
    footer_run = footer.add_run(
        "Contains public sector information licensed under the Open Government Licence v3.0 — NHS England.\n"
        "This tool supports but does not replace clinical judgment or formal supervision documentation."
    )
    footer_run.font.size = Pt(8)
    footer_run.font.color.rgb = RGBColor(0x6b, 0x72, 0x80)
    footer_run.italic = True

    buf = BytesIO()
    doc.save(buf)
    return buf.getvalue()


def build_cpd_docx(note_text: str, nurse_name: str = "", hours: float = 1.0) -> bytes | None:
    """Build NMC revalidation CPD record."""
    if not HAS_DOCX:
        return None

    doc = Document()

    header_para = doc.add_paragraph()
    header_para.alignment = WD_ALIGN_PARAGRAPH.CENTER
    run = header_para.add_run("NMC Revalidation — CPD Record")
    run.bold = True
    run.font.size = Pt(16)
    run.font.color.rgb = RGBColor(0x1a, 0x24, 0x60)

    doc.add_paragraph()

    fields = [
        ("Date", date.today().strftime("%d %B %Y")),
        ("Name", nurse_name or "___________________"),
        ("NMC PIN", "___________________"),
        ("Activity Type", "Restorative Clinical Supervision (A-EQUIP Model)"),
        ("Hours", f"{hours:.1f}"),
        ("Method", "1:1 Supervision with AI-assisted preparation/reflection"),
        ("NMC Standards",
         "Platform 1 (Accountable professional), Platform 6 (Safety & quality)"),
    ]

    for label, value in fields:
        p = doc.add_paragraph()
        p.add_run(f"{label}: ").bold = True
        p.add_run(value)

    doc.add_paragraph()
    doc.add_heading("Supervision Summary", level=2)

    for line in note_text.split("\n"):
        line = line.strip()
        if not line:
            continue
        if line.startswith("### "):
            doc.add_heading(line[4:], level=3)
        elif line.startswith("- "):
            doc.add_paragraph(line[2:], style="List Bullet")
        elif not line.startswith("## ") and not line.startswith("**Date"):
            doc.add_paragraph(line)

    doc.add_paragraph()
    sig_p = doc.add_paragraph()
    sig_p.add_run("Nurse signature: ").bold = True
    sig_p.add_run("_________________________")

    conf_p = doc.add_paragraph()
    conf_p.add_run("Confirming PNA/Supervisor: ").bold = True
    conf_p.add_run("_________________________")

    doc.add_paragraph()
    footer = doc.add_paragraph()
    footer.alignment = WD_ALIGN_PARAGRAPH.CENTER
    fr = footer.add_run(
        "Contains public sector information licensed under the Open Government Licence v3.0 — NHS England."
    )
    fr.font.size = Pt(8)
    fr.italic = True

    buf = BytesIO()
    doc.save(buf)
    return buf.getvalue()