"""Initial schema

Revision ID: 2023_11_24_initial
Revises: 
Create Date: 2023-11-24

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.sql import func
import enum


# revision identifiers, used by Alembic.
revision = '2023_11_24_initial'
down_revision = None
branch_labels = None
depends_on = None


class MovementType(str, enum.Enum):
    PURCHASE = "purchase"
    SALE = "sale"
    ADJUSTMENT = "adjustment"
    RETURN = "return"
    INITIAL = "initial"


def upgrade() -> None:
    # Create user table
    op.create_table(
        'user',
        sa.Column('id', sa.String(), primary_key=True, index=True),
        sa.Column('email', sa.String(), unique=True, index=True, nullable=False),
        sa.Column('username', sa.String(), unique=True, index=True, nullable=False),
        sa.Column('hashed_password', sa.String(), nullable=False),
        sa.Column('full_name', sa.String(), nullable=True),
        sa.Column('is_active', sa.Boolean(), default=True),
        sa.Column('is_superuser', sa.Boolean(), default=False),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )
    
    # Create category table
    op.create_table(
        'category',
        sa.Column('id', sa.String(), primary_key=True, index=True),
        sa.Column('name', sa.String(), index=True, nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )
    
    # Create supplier table
    op.create_table(
        'supplier',
        sa.Column('id', sa.String(), primary_key=True, index=True),
        sa.Column('name', sa.String(), index=True, nullable=False),
        sa.Column('contact_name', sa.String(), nullable=True),
        sa.Column('email', sa.String(), nullable=True),
        sa.Column('phone', sa.String(), nullable=True),
        sa.Column('address', sa.Text(), nullable=True),
        sa.Column('notes', sa.Text(), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )
    
    # Create product table
    op.create_table(
        'product',
        sa.Column('id', sa.String(), primary_key=True, index=True),
        sa.Column('name', sa.String(), index=True, nullable=False),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('sku', sa.String(), unique=True, index=True, nullable=False),
        sa.Column('barcode', sa.String(), unique=True, nullable=True),
        sa.Column('category_id', sa.String(), sa.ForeignKey("category.id"), nullable=True),
        sa.Column('supplier_id', sa.String(), sa.ForeignKey("supplier.id"), nullable=True),
        sa.Column('cost_price', sa.Float(), nullable=False, default=0.0),
        sa.Column('selling_price', sa.Float(), nullable=False, default=0.0),
        sa.Column('current_stock', sa.Integer(), nullable=False, default=0),
        sa.Column('reorder_level', sa.Integer(), nullable=False, default=0),
        sa.Column('is_active', sa.Boolean(), default=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )
    
    # Create stock_movement table
    op.create_table(
        'stockmovement',
        sa.Column('id', sa.String(), primary_key=True, index=True),
        sa.Column('product_id', sa.String(), sa.ForeignKey("product.id"), nullable=False),
        sa.Column('quantity', sa.Integer(), nullable=False),
        sa.Column('unit_price', sa.Float(), nullable=True),
        sa.Column('movement_type', sa.Enum(MovementType), nullable=False),
        sa.Column('reference', sa.String(), nullable=True),
        sa.Column('notes', sa.Text(), nullable=True),
        sa.Column('created_by', sa.String(), sa.ForeignKey("user.id"), nullable=True),
        sa.Column('created_at', sa.DateTime(timezone=True), server_default=func.now()),
        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
    )
    
    # Create indexes
    op.create_index(op.f('ix_product_name'), 'product', ['name'], unique=False)
    op.create_index(op.f('ix_product_sku'), 'product', ['sku'], unique=True)
    op.create_index(op.f('ix_category_name'), 'category', ['name'], unique=False)
    op.create_index(op.f('ix_supplier_name'), 'supplier', ['name'], unique=False)
    op.create_index(op.f('ix_user_email'), 'user', ['email'], unique=True)
    op.create_index(op.f('ix_user_username'), 'user', ['username'], unique=True)


def downgrade() -> None:
    # Drop tables in reverse order of creation
    op.drop_table('stockmovement')
    op.drop_table('product')
    op.drop_table('supplier')
    op.drop_table('category')
    op.drop_table('user')