from __future__ import annotations

from collections import defaultdict

from .config import DATASET_TYPE, GeneratorConfig
from .models import DatasetBundle, stable_id

MATERIAL_GROUPS = (
    "STEEL_PLATE", "SECTION_STEEL", "PIPE", "VALVE", "PUMP", "CABLE",
    "ELECTRICAL", "HVAC", "PAINT", "WELDING", "OUTFITTING", "MACHINERY",
)


def _material_identity(index: int) -> tuple[str, str]:
    code = f"MAT-SYN-{index:05d}"
    return code, stable_id("material", code, prefix="MAT")


def generate_materials(bundle: DatasetBundle, config: GeneratorConfig) -> DatasetBundle:
    p = config.profile
    materials: list[dict] = []
    inventory: list[dict] = []
    allocations: list[dict] = []
    substitutes: list[dict] = []
    receipts: list[dict] = []
    projects = [stable_id("project", code, prefix="PRJ") for code in config.project_codes]
    for index in range(1, p.material_count + 1):
        code, material_id = _material_identity(index)
        group = MATERIAL_GROUPS[(index - 1) % len(MATERIAL_GROUPS)]
        bucket = (index - 1) % 20
        if bucket < 5:
            sourcing = "MAKE"
        elif bucket < 15:
            sourcing = "BUY"
        elif bucket < 18:
            sourcing = "OUTSOURCE"
        elif bucket == 18:
            sourcing = "OWNER_SUPPLIED"
        else:
            sourcing = "BUY"
        fulfillment = ("STOCK", "TRANSFER", "PLANNED_RECEIPT", "NEW_SUPPLY")[(index - 1) % 4]
        if index % 97 == 0:
            fulfillment = "DESIGN_PENDING"
        routing_id = None
        if sourcing == "MAKE":
            routing_no = ((index - 1) % p.routing_count) + 1
            routing_code = f"RT-SYN-{routing_no:04d}"
            routing_id = stable_id("routing", routing_code, prefix="RTG")
        supplier_id = None
        if sourcing in {"BUY", "OUTSOURCE"}:
            supplier_no = ((index - 1) % p.supplier_count) + 1
            supplier_code = f"SUP-SYN-{supplier_no:03d}"
            supplier_id = stable_id("supplier", supplier_code, prefix="SUP")
        materials.append({
            "materialId": material_id,
            "materialCode": code,
            "name": f"{group}-模拟物料-{index:05d}",
            "materialGroup": group,
            "sourcingMode": sourcing,
            "fulfillmentMode": fulfillment,
            "unit": "KG" if group in {"STEEL_PLATE", "SECTION_STEEL", "PIPE"} else "EA",
            "unitWeightKg": round(0.5 + (index % 240) * 0.75, 3),
            "leadTimeDays": 0 if sourcing == "MAKE" else 10 + index % 90,
            "safetyStock": index % 7,
            "moq": 1 + index % 20,
            "orderMultiple": 1 + index % 10,
            "yieldRate": round(0.94 + (index % 6) * 0.01, 3),
            "scrapRate": round(0.01 + (index % 4) * 0.005, 3),
            "routingId": routing_id,
            "primarySupplierId": supplier_id,
            "designStatus": "PENDING" if fulfillment == "DESIGN_PENDING" else "RELEASED",
            "datasetType": DATASET_TYPE,
        })
        if index % 5 != 0:
            warehouse_no = ((index - 1) % 8) + 1
            warehouse_code = f"WH-SYN-{warehouse_no:03d}"
            inventory_id = stable_id("inventory", material_id, warehouse_code, prefix="INV")
            quantity = round(2 + (index * 17) % 20, 3)
            inventory.append({
                "inventoryId": inventory_id,
                "materialId": material_id,
                "warehouseId": stable_id("warehouse", warehouse_code, prefix="WH"),
                "batchNo": f"BATCH-SYN-{index:06d}",
                "quantity": quantity,
                "qualityStatus": "RELEASED" if index % 23 else "HOLD",
                "projectRestricted": bool(index % 11 == 0),
                "expiryDate": None if group not in {"PAINT", "WELDING"} else f"2027-{(index % 12)+1:02d}-28",
            })
            if index % 3 == 0:
                project_id = projects[(index - 1) % len(projects)]
                allocations.append({
                    "allocationId": stable_id("allocation", inventory_id, project_id, prefix="ALLOC"),
                    "inventoryId": inventory_id,
                    "projectId": project_id,
                    "quantity": round(quantity * 0.25, 3),
                    "releaseAllowed": bool(index % 6 == 0),
                })
        if index > 1 and index % 20 == 0:
            _, substitute_id = _material_identity(index - 1)
            substitutes.append({
                "substituteId": stable_id("substitute", material_id, substitute_id, prefix="SUB"),
                "materialId": material_id,
                "substituteMaterialId": substitute_id,
                "conversionFactor": 1.0,
                "approved": True,
            })
        if supplier_id and index % 4 == 0:
            receipts.append({
                "plannedReceiptId": stable_id("receipt", material_id, index, prefix="PRC"),
                "materialId": material_id,
                "supplierId": supplier_id,
                "quantity": 30 + index % 300,
                "availableDate": (config.planning_base_date.replace(day=1)).isoformat(),
                "trusted": bool(index % 12 != 0),
                "status": "CONFIRMED" if index % 12 != 0 else "UNCONFIRMED",
            })
    bundle.set_rows("materials", materials)
    bundle.set_rows("inventory", inventory)
    bundle.set_rows("inventory-allocations", allocations)
    bundle.set_rows("substitutes", substitutes)
    bundle.set_rows("planned-receipts", receipts)
    bundle.artifacts["materialClassification"] = dict(
        sorted(defaultdict(int, {mode: sum(1 for row in materials if row["sourcingMode"] == mode) for mode in {row["sourcingMode"] for row in materials}}).items())
    )
    return bundle