"""Add stock transfers (Create Stock Transfer form).

Revision ID: 021_stock_transfers
Revises: 020_warehouse_form_fields
Create Date: 2026-08-09
"""

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op

revision: str = "021_stock_transfers"
down_revision: Union[str, None] = "020_warehouse_form_fields"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "stock_transfers",
        sa.Column("id", sa.String(length=36), primary_key=True),
        sa.Column("company_id", sa.String(length=36), nullable=False),
        sa.Column("transfer_number", sa.String(length=50), nullable=False),
        sa.Column("transfer_date", sa.Date(), nullable=False),
        sa.Column("expected_delivery_date", sa.Date(), nullable=False),
        sa.Column("priority", sa.String(length=20), nullable=False, server_default="normal"),
        sa.Column("reason", sa.String(length=40), nullable=False),
        sa.Column("reference", sa.String(length=100), nullable=True),
        sa.Column("notes", sa.String(length=500), nullable=True),
        sa.Column("from_warehouse_id", sa.String(length=36), nullable=False),
        sa.Column("to_warehouse_id", sa.String(length=36), nullable=False),
        sa.Column("status", sa.String(length=20), nullable=False, server_default="draft"),
        sa.Column("total_items", sa.Integer(), nullable=False, server_default="0"),
        sa.Column(
            "total_quantity",
            sa.Numeric(18, 4),
            nullable=False,
            server_default="0.0000",
        ),
        sa.Column(
            "total_transfer_value",
            sa.Numeric(18, 2),
            nullable=False,
            server_default="0.00",
        ),
        sa.Column("created_by", sa.String(length=36), nullable=True),
        sa.Column("submitted_at", sa.DateTime(), nullable=True),
        sa.Column("approved_at", sa.DateTime(), nullable=True),
        sa.Column("picked_at", sa.DateTime(), nullable=True),
        sa.Column("shipped_at", sa.DateTime(), nullable=True),
        sa.Column("received_at", sa.DateTime(), nullable=True),
        sa.Column("completed_at", sa.DateTime(), nullable=True),
        sa.Column("cancelled_at", sa.DateTime(), nullable=True),
        sa.Column("created_at", sa.DateTime(), nullable=False),
        sa.Column("updated_at", sa.DateTime(), nullable=False),
        sa.ForeignKeyConstraint(["company_id"], ["companies.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(
            ["from_warehouse_id"], ["warehouses.id"], ondelete="RESTRICT"
        ),
        sa.ForeignKeyConstraint(
            ["to_warehouse_id"], ["warehouses.id"], ondelete="RESTRICT"
        ),
        sa.UniqueConstraint(
            "company_id", "transfer_number", name="uq_stock_transfer_company_number"
        ),
    )
    op.create_index("ix_stock_transfers_company_id", "stock_transfers", ["company_id"])
    op.create_index("ix_stock_transfers_status", "stock_transfers", ["status"])
    op.create_index(
        "ix_stock_transfers_from_warehouse_id",
        "stock_transfers",
        ["from_warehouse_id"],
    )
    op.create_index(
        "ix_stock_transfers_to_warehouse_id",
        "stock_transfers",
        ["to_warehouse_id"],
    )

    op.create_table(
        "stock_transfer_lines",
        sa.Column("id", sa.String(length=36), primary_key=True),
        sa.Column("stock_transfer_id", sa.String(length=36), nullable=False),
        sa.Column("line_number", sa.Integer(), nullable=False),
        sa.Column("item_id", sa.String(length=36), nullable=False),
        sa.Column(
            "available_qty",
            sa.Numeric(18, 4),
            nullable=False,
            server_default="0.0000",
        ),
        sa.Column("transfer_qty", sa.Numeric(18, 4), nullable=False),
        sa.Column("base_unit_id", sa.String(length=36), nullable=True),
        sa.Column("batch_lot_no", sa.String(length=100), nullable=True),
        sa.Column(
            "unit_cost",
            sa.Numeric(18, 4),
            nullable=False,
            server_default="0.0000",
        ),
        sa.Column(
            "line_value",
            sa.Numeric(18, 2),
            nullable=False,
            server_default="0.00",
        ),
        sa.ForeignKeyConstraint(
            ["stock_transfer_id"], ["stock_transfers.id"], ondelete="CASCADE"
        ),
        sa.ForeignKeyConstraint(["item_id"], ["items.id"], ondelete="RESTRICT"),
        sa.ForeignKeyConstraint(["base_unit_id"], ["base_units.id"], ondelete="SET NULL"),
    )
    op.create_index(
        "ix_stock_transfer_lines_transfer_id",
        "stock_transfer_lines",
        ["stock_transfer_id"],
    )
    op.create_index(
        "ix_stock_transfer_lines_item_id",
        "stock_transfer_lines",
        ["item_id"],
    )
    op.create_index(
        "ix_stock_transfer_lines_base_unit_id",
        "stock_transfer_lines",
        ["base_unit_id"],
    )


def downgrade() -> None:
    op.drop_index("ix_stock_transfer_lines_base_unit_id", table_name="stock_transfer_lines")
    op.drop_index("ix_stock_transfer_lines_item_id", table_name="stock_transfer_lines")
    op.drop_index("ix_stock_transfer_lines_transfer_id", table_name="stock_transfer_lines")
    op.drop_table("stock_transfer_lines")
    op.drop_index("ix_stock_transfers_to_warehouse_id", table_name="stock_transfers")
    op.drop_index("ix_stock_transfers_from_warehouse_id", table_name="stock_transfers")
    op.drop_index("ix_stock_transfers_status", table_name="stock_transfers")
    op.drop_index("ix_stock_transfers_company_id", table_name="stock_transfers")
    op.drop_table("stock_transfers")