from datetime import date, datetime

from sqlalchemy import select

from app.db.session import Base, SessionLocal, engine
from app.models.assumption import FreightCostRule, PackagingCostRule, ProcessCostRule
from app.models.client_access import ClientAccount, ClientFeatureAccess, ClientUser
from app.models.mix import Mix, MixIngredient
from app.models.product import Product
from app.models.raw_material import RawMaterial, RawMaterialPriceVersion


CLIENT_FEATURES = [
    ("dashboard", "Dashboard", "workspace", "Top-level operational dashboard"),
    ("raw_materials", "Raw Materials", "costing", "Maintain live material costs and versions"),
    ("mix_master", "Mix Master", "costing", "Create and maintain mix worksheets"),
    ("products", "Products", "pricing", "Review finished product pricing"),
    ("scenarios", "Scenarios", "planning", "Run scenario overrides and comparisons"),
    ("powerbi_export", "Power BI Export", "reporting", "Expose client access data to BI consumers"),
]


def seed_client_access(db):
    existing = db.scalar(select(ClientAccount.id))
    if existing is not None:
        return

    specialty = ClientAccount(
        tenant_id="hunter-premium-produce",
        name="Hunter Premium Produce",
        client_code="HPP",
        status="active",
        powerbi_workspace="hunter-premium-produce-prod",
        notes="Primary production client for the Lean 101 admin and access workflows",
    )
    loft = ClientAccount(
        tenant_id="loft-grains",
        name="Loft Grains",
        client_code="LOFT",
        status="onboarding",
        powerbi_workspace="farm-ops-sandbox",
        notes="Onboarding workspace used to test staged user enablement",
    )

    db.add_all([specialty, loft])
    db.flush()

    specialty.users.extend(
        [
            ClientUser(
                tenant_id=specialty.tenant_id,
                full_name="Amelia Hart",
                email="operator@example.com",
                role="admin",
                status="active",
                is_new_user=False,
                last_login_at=datetime(2026, 4, 24, 11, 30),
            ),
            ClientUser(
                tenant_id=specialty.tenant_id,
                full_name="Ethan Cole",
                email="ethan.cole@hunterpremiumproduce.example",
                role="operator",
                status="invited",
                is_new_user=True,
            ),
        ]
    )
    loft.users.extend(
        [
            ClientUser(
                tenant_id=loft.tenant_id,
                full_name="Ruby Singh",
                email="ruby.singh@loftgrains.example",
                role="viewer",
                status="active",
                is_new_user=False,
                last_login_at=datetime(2026, 4, 22, 9, 10),
            )
        ]
    )

    enabled_feature_map = {
        "hunter-premium-produce": {"dashboard", "raw_materials", "mix_master", "products", "scenarios", "powerbi_export"},
        "loft-grains": {"dashboard", "products", "powerbi_export"},
    }

    for client in (specialty, loft):
        enabled_keys = enabled_feature_map[client.tenant_id]
        for feature_key, feature_name, feature_group, description in CLIENT_FEATURES:
            client.features.append(
                ClientFeatureAccess(
                    tenant_id=client.tenant_id,
                    feature_key=feature_key,
                    feature_name=feature_name,
                    feature_group=feature_group,
                    description=description,
                    enabled=feature_key in enabled_keys,
                )
            )


def seed_costing_workspace(db):
    existing = db.scalar(select(RawMaterial.id))
    if existing is not None:
        return

    tenant_id = "hunter-premium-produce"

    maize = RawMaterial(tenant_id=tenant_id, name="Maize", supplier="Example Supplier", unit_of_measure="tonne", kg_per_unit=1000, status="active")
    barley = RawMaterial(tenant_id=tenant_id, name="Barley", supplier="Example Supplier", unit_of_measure="tonne", kg_per_unit=1000, status="active")
    acid_buf = RawMaterial(tenant_id=tenant_id, name="Acid Buf", supplier="Example Supplier", unit_of_measure="bag", kg_per_unit=25, status="active")

    maize.price_versions.append(RawMaterialPriceVersion(tenant_id=tenant_id, market_value=520, waste_percentage=0.02, effective_date=date(2026, 4, 1)))
    barley.price_versions.append(RawMaterialPriceVersion(tenant_id=tenant_id, market_value=470, waste_percentage=0.015, effective_date=date(2026, 4, 1)))
    acid_buf.price_versions.append(RawMaterialPriceVersion(tenant_id=tenant_id, market_value=39, waste_percentage=0.0, effective_date=date(2026, 4, 1)))

    db.add_all([maize, barley, acid_buf])
    db.flush()

    db.add_all(
        [
            ProcessCostRule(tenant_id=tenant_id, process_name="standard_bagging", grading_cost=0.055, bagging_cost=0.04, cracking_cost=0.0),
            ProcessCostRule(tenant_id=tenant_id, process_name="bulk_loadout", grading_cost=0.03, bagging_cost=0.0, cracking_cost=0.0),
            PackagingCostRule(tenant_id=tenant_id, sale_type="standard", unit_of_measure="20kg bag", own_bag=False, bag_cost=0.63),
            PackagingCostRule(tenant_id=tenant_id, sale_type="bulka", unit_of_measure="550kg bulka", own_bag=False, bag_cost=7.5),
            FreightCostRule(tenant_id=tenant_id, sale_type="standard", unit_of_measure="20kg bag", cost_per_unit=1.45),
            FreightCostRule(tenant_id=tenant_id, sale_type="bulka", unit_of_measure="550kg bulka", cost_per_unit=18.0),
        ]
    )
    db.flush()

    mix = Mix(tenant_id=tenant_id, client_name="Hunter Premium Produce", name="Hunter Orchard Blend", status="active", version=1, notes="Seed recipe for MVP")
    db.add(mix)
    db.flush()

    db.add_all(
        [
            MixIngredient(tenant_id=tenant_id, mix_id=mix.id, raw_material_id=maize.id, quantity_kg=180),
            MixIngredient(tenant_id=tenant_id, mix_id=mix.id, raw_material_id=barley.id, quantity_kg=95),
            MixIngredient(tenant_id=tenant_id, mix_id=mix.id, raw_material_id=acid_buf.id, quantity_kg=5),
        ]
    )
    db.flush()

    db.add(
        Product(
            tenant_id=tenant_id,
            client_name="Hunter Premium Produce",
            item_id="SKU-001",
            name="Hunter Orchard Blend 20kg",
            mix_id=mix.id,
            sale_type="standard",
            own_bag=False,
            unit_of_measure="20kg bag",
            items_per_pallet=50,
            bagging_process="standard_bagging",
            distributor_margin=0.225,
            wholesale_margin=0.18,
            notes="Reference product for formula parity work",
        )
    )


def seed_if_empty():
    Base.metadata.create_all(bind=engine)
    with SessionLocal() as db:
        seed_costing_workspace(db)
        seed_client_access(db)
        db.commit()


if __name__ == "__main__":
    seed_if_empty()