from typing import Dict, List
import yaml

def load_catalog(path="configs/parts_catalog.yaml"):
    with open(path,"r",encoding="utf-8") as f:
        return yaml.safe_load(f)

def load_regions(path="configs/regions.yaml"):
    with open(path,"r",encoding="utf-8") as f:
        return yaml.safe_load(f)

def price_issues(issues: List[str], region_code: str="IN-HYD", catalog=None, regions=None) -> Dict:
    catalog = catalog or load_catalog()
    regions = regions or load_regions()
    parts = catalog.get("issues", {})
    tax_rate = float(catalog.get("tax_rate", 0.18))
    region = regions["regions"][region_code]
    currency = region["currency"]
    labor_rate = float(region["labor_rate_per_hour"])
    p_mult = float(region["parts_multiplier"])
    items = []
    subtotal = 0.0
    for label in issues:
        if label == "diagnostic_inspection":
            items.append({
                "issue": label,
                "solution": "Perform comprehensive inspection to localize faults.",
                "labor_hours": 0.5,
                "labor_cost": round(0.5*labor_rate,2),
                "parts": [],
                "parts_cost": 0.0,
                "line_total": round(0.5*labor_rate,2),
                "currency": currency
            })
            subtotal += 0.5*labor_rate
            continue
        spec = parts.get(label, {"parts": [], "labor_hours": 1.0})
        hours = float(spec.get("labor_hours",1.0))
        parts_cost = sum([float(p.get("cost",0.0))*p_mult for p in spec.get("parts",[])])
        labor_cost = hours * labor_rate
        line = labor_cost + parts_cost
        solution = DEFAULT_SOLUTIONS.get(label, "Repair as per standard service procedure.")
        items.append({
            "issue": label,
            "solution": solution,
            "labor_hours": hours,
            "labor_cost": round(labor_cost,2),
            "parts": spec.get("parts",[]),
            "parts_cost": round(parts_cost,2),
            "line_total": round(line,2),
            "currency": currency
        })
        subtotal += line
    tax = round(tax_rate * subtotal,2)
    grand = round(subtotal + tax,2)
    return {"region": region_code, "currency": currency, "items": items, "subtotal": round(subtotal,2), "tax": tax, "grand_total": grand}

DEFAULT_SOLUTIONS = {
    "scratch_dent": "Panel dent repair and surface leveling; finish with primer and paint blend.",
    "paint_damage": "Prep, prime, color-match repaint, and clear coat application.",
    "cracked_windshield": "Replace windshield and seal; calibrate sensors if equipped.",
    "flat_tire": "Replace tire; balance and perform wheel alignment check.",
    "engine_leak": "Identify leak source; replace gaskets/seals; top up fluids and clean bay.",
    "brake_wear": "Replace brake pads; inspect rotors and bleed lines if required.",
    "headlight_fault": "Replace bulb/assembly; verify wiring and aim beam.",
    "battery_corrosion": "Clean terminals; replace corroded connectors; apply protective grease.",
    "rust": "Sand, treat with rust converter; prime and protect underbody.",
    "bumper_damage": "Replace or plastic-weld bumper; refit and paint as needed.",
    "diagnostic_inspection": "Full diagnostic scan and physical inspection to isolate faults."
}