init

2026-03-22 12:40:33 +03:00
commit 28a5d51389
61 changed files with 6085 additions and 0 deletions
--- a/backend/app/services/price_engine.py
+++ b/backend/app/services/price_engine.py
@@ -0,0 +1,140 @@
+import logging
+from dataclasses import dataclass
+from app.services.file_parser import FileInfo
+
+logger = logging.getLogger("app.services.price_engine")
+
+TIME_RATE_PER_HOUR = 200.0  # руб/час
+SETUP_TIME_MIN = 15.0  # минуты
+TRAVEL_TIME_PER_LAYER_MIN = 0.3
+
+POST_PROCESSING_COSTS = {
+    "sanding": 300.0,
+    "painting": 500.0,
+    "threading": 200.0,
+    "acetone_smoothing": 400.0,
+}
+
+QUANTITY_DISCOUNTS = [
+    (1, 0),
+    (2, 5),
+    (6, 10),
+    (21, 15),
+    (101, 20),
+]
+
+
+@dataclass
+class PriceResult:
+    weight_grams: float
+    material_cost_rub: float
+    print_time_hours: float
+    time_cost_rub: float
+    post_processing_cost_rub: float
+    subtotal_rub: float
+    quantity: int
+    quantity_discount_percent: int
+    total_rub: float
+    estimated_days: int
+
+
+def get_quantity_discount(quantity: int) -> int:
+    discount = 0
+    for min_qty, disc in QUANTITY_DISCOUNTS:
+        if quantity >= min_qty:
+            discount = disc
+    logger.debug("Quantity discount for %d pcs: %d%%", quantity, discount)
+    return discount
+
+
+def estimate_print_time(file_info: FileInfo, layer_height_mm: float, flow_rate_mm3_s: float) -> float:
+    """Estimate print time in hours."""
+    z_height = file_info.bounding_box_mm.get("z", 10.0)
+    layers = max(z_height / layer_height_mm, 1)
+    volume_mm3 = file_info.volume_cm3 * 1000.0
+    volume_per_layer = volume_mm3 / layers
+    time_per_layer_min = volume_per_layer / flow_rate_mm3_s / 60.0
+    total_min = layers * (time_per_layer_min + TRAVEL_TIME_PER_LAYER_MIN) + SETUP_TIME_MIN
+    hours = round(total_min / 60.0, 1)
+    logger.debug("Print time estimate: z=%.1fmm, layers=%.0f, vol_per_layer=%.1fmm3, "
+                 "time_per_layer=%.2fmin, total=%.1fmin (%.1fh)",
+                 z_height, layers, volume_per_layer, time_per_layer_min, total_min, hours)
+    return hours
+
+
+def calculate_price(
+    file_info: FileInfo,
+    density_g_cm3: float,
+    price_per_gram: float,
+    flow_rate_mm3_s: float,
+    infill_percent: int = 30,
+    layer_height_mm: float = 0.2,
+    quantity: int = 1,
+    post_processing: list[str] | None = None,
+) -> PriceResult:
+    post_processing = post_processing or []
+
+    logger.info("=== Price calculation start ===")
+    logger.info("Input: volume=%.2f cm3, density=%.2f g/cm3, price_per_gram=%.1f RUB",
+                file_info.volume_cm3, density_g_cm3, price_per_gram)
+    logger.info("Params: infill=%d%%, layer=%.2fmm, qty=%d, post_processing=%s",
+                infill_percent, layer_height_mm, quantity, post_processing)
+
+    effective_volume = file_info.volume_cm3 * (infill_percent / 100.0) * 0.7 + file_info.volume_cm3 * 0.3
+    logger.debug("Effective volume: %.2f cm3 (infill-scaled: %.2f + walls: %.2f)",
+                 effective_volume,
+                 file_info.volume_cm3 * (infill_percent / 100.0) * 0.7,
+                 file_info.volume_cm3 * 0.3)
+
+    weight_g = round(effective_volume * density_g_cm3, 1)
+    material_cost = round(weight_g * price_per_gram, 2)
+    logger.debug("Weight: %.1f g, material cost: %.2f RUB", weight_g, material_cost)
+
+    print_time_h = estimate_print_time(file_info, layer_height_mm, flow_rate_mm3_s)
+    time_cost = round(print_time_h * TIME_RATE_PER_HOUR, 2)
+    logger.debug("Print time: %.1f h, time cost: %.2f RUB (rate: %.0f RUB/h)", print_time_h, time_cost, TIME_RATE_PER_HOUR)
+
+    pp_cost = 0.0
+    for pp in post_processing:
+        cost = POST_PROCESSING_COSTS.get(pp, 0)
+        logger.debug("Post-processing '%s': %.0f RUB", pp, cost)
+        pp_cost += cost
+    pp_cost = round(pp_cost, 2)
+    logger.debug("Total post-processing cost: %.2f RUB", pp_cost)
+
+    subtotal = round(material_cost + time_cost + pp_cost, 2)
+    logger.debug("Subtotal (1 pc): %.2f RUB = material(%.2f) + time(%.2f) + pp(%.2f)",
+                 subtotal, material_cost, time_cost, pp_cost)
+
+    discount_pct = get_quantity_discount(quantity)
+    total = round(subtotal * quantity * (1 - discount_pct / 100.0), 2)
+    logger.info("Total: %.2f RUB (qty=%d, discount=%d%%, subtotal_per_unit=%.2f)",
+                total, quantity, discount_pct, subtotal)
+
+    if print_time_h <= 2:
+        estimated_days = 2
+    elif print_time_h <= 8:
+        estimated_days = 3
+    else:
+        estimated_days = 5
+
+    if quantity > 10:
+        estimated_days += 2
+    if quantity > 50:
+        estimated_days += 3
+
+    logger.info("Estimated days: %d", estimated_days)
+    logger.info("=== Price calculation complete ===")
+
+    return PriceResult(
+        weight_grams=weight_g,
+        material_cost_rub=material_cost,
+        print_time_hours=print_time_h,
+        time_cost_rub=time_cost,
+        post_processing_cost_rub=pp_cost,
+        subtotal_rub=subtotal,
+        quantity=quantity,
+        quantity_discount_percent=discount_pct,
+        total_rub=total,
+        estimated_days=estimated_days,
+    )