# core/file_builder.py
from pathlib import Path
from io import BytesIO
from datetime import datetime
from docx import Document
from docx.shared import Inches, Pt, RGBColor
from docx.enum.text import WD_ALIGN_PARAGRAPH
import openpyxl
from openpyxl.styles import Font, PatternFill, Alignment, Border, Side

DOCS_DIR = Path("data/docs")
DOCS_DIR.mkdir(parents=True, exist_ok=True)

def build_docx(title: str, content: str, images: list[bytes] = None) -> Path | None:
    doc = Document()
    
    # Configuración básica
    section = doc.sections[0]
    section.top_margin = section.bottom_margin = Inches(1)
    section.left_margin = section.right_margin = Inches(1.2)
    
    # Título
    p = doc.add_heading(title, 0)
    p.alignment = WD_ALIGN_PARAGRAPH.CENTER
    if p.runs:
        run = p.runs[0]
        run.font.color.rgb = RGBColor(0x1a, 0x56, 0xdb)
    
    # Fecha
    doc.add_paragraph(f"Generado por Mission Control AI — {datetime.now().strftime('%B %d, %Y')}", style='Italic')
    doc.add_paragraph()
    
    # Procesar contenido markdown-like
    lines = content.splitlines()
    current_p = None
    
    for line in lines:
        line = line.strip()
        if not line:
            continue
        if line.startswith('## '):
            doc.add_heading(line[3:], level=1)
        elif line.startswith('### '):
            doc.add_heading(line[4:], level=2)
        elif line.startswith('- ') or line.startswith('* '):
            p = doc.add_paragraph(line[2:], style='List Bullet')
        else:
            if current_p is None:
                current_p = doc.add_paragraph()
            current_p.add_run(line + " ")
    
    # Insertar imágenes si existen
    if images:
        for img_bytes in images:
            try:
                doc.add_picture(BytesIO(img_bytes), width=Inches(5))
                last_p = doc.paragraphs[-1]
                last_p.alignment = WD_ALIGN_PARAGRAPH.CENTER
            except:
                pass
    
    # Pie de página
    p = doc.add_paragraph("— Generado por Mission Control AI —")
    p.alignment = WD_ALIGN_PARAGRAPH.CENTER
    if p.runs:
        p.runs[0].italic = True
        p.runs[0].font.size = Pt(9)
        p.runs[0].font.color.rgb = RGBColor(0x6b, 0x72, 0x80)
    
    # Guardar
    safe_title = "".join(c for c in title if c.isalnum() or c in " -_")[:40]
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    filename = DOCS_DIR / f"{safe_title}_{timestamp}.docx"
    
    doc.save(filename)
    return filename