import json
from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, Table, TableStyle

def export_json(payload, path):
    with open(path, "w", encoding="utf-8") as f:
        json.dump(payload, f, ensure_ascii=False, indent=2)
    return path

def export_pdf(payload, path):
    doc = SimpleDocTemplate(path, pagesize=A4)
    styles = getSampleStyleSheet()
    story = []
    story.append(Paragraph("<b>Car Analysis Advisor Report</b>", styles["Title"]))
    story.append(Spacer(1, 8))
    story.append(Paragraph(f"<b>Region:</b> {payload['pricing']['region']} | <b>Currency:</b> {payload['pricing']['currency']}", styles["Normal"]))
    story.append(Spacer(1, 8))
    story.append(Paragraph(f"<b>Model:</b> {payload['vehicle']['model']} | <b>Color:</b> {payload['vehicle']['color']['name']} ({payload['vehicle']['color']['hex']})", styles["Normal"]))
    story.append(Spacer(1, 10))
    story.append(Paragraph("<b>Issues & Solutions</b>", styles["Heading2"]))
    data = [["Issue","Solution","Labor (hrs)","Labor","Parts","Line Total"]]
    for it in payload["pricing"]["items"]:
        parts_cost = f"{payload['pricing']['currency']} {it['parts_cost']:.2f}"
        data.append([it["issue"].replace('_',' '), it["solution"], f"{it['labor_hours']:.2f}",
                     f"{payload['pricing']['currency']} {it['labor_cost']:.2f}", parts_cost,
                     f"{payload['pricing']['currency']} {it['line_total']:.2f}"])
    table = Table(data, hAlign="LEFT", colWidths=[90,220,70,70,70,80])
    table.setStyle(TableStyle([
        ('BACKGROUND',(0,0),(-1,0),colors.darkblue),
        ('TEXTCOLOR',(0,0),(-1,0),colors.whitesmoke),
        ('GRID',(0,0),(-1,-1),0.25,colors.grey),
        ('ALIGN',(2,1),(-1,-1),'CENTER')
    ]))
    story.append(table)
    story.append(Spacer(1, 8))
    story.append(Paragraph(f"<b>Subtotal:</b> {payload['pricing']['currency']} {payload['pricing']['subtotal']:.2f}", styles["Normal"]))
    story.append(Paragraph(f"<b>Tax:</b> {payload['pricing']['currency']} {payload['pricing']['tax']:.2f}", styles["Normal"]))
    story.append(Paragraph(f"<b>Grand Total:</b> {payload['pricing']['currency']} {payload['pricing']['grand_total']:.2f}", styles["Heading3"]))
    doc.build(story)
    return path