import json
from datetime import datetime

from alembic import op
import sqlalchemy as sa
from sqlalchemy import column, func, table
from sqlalchemy.orm import Session

revision = 'bbec86de37c4'
down_revision = '278bcfb487d3'
branch_labels = None
depends_on = None


def upgrade():
    op.create_table('country',
                    sa.Column('country_code', sa.String(length=2), nullable=False),
                    sa.Column('risk_level_override', sa.Integer(), nullable=True),
                    sa.Column('id', sa.Integer(), nullable=False),
                    sa.Column('description', sa.String(length=255), nullable=False),
                    sa.Column('added', sa.DateTime(), nullable=False),
                    sa.Column('updated', sa.DateTime(), nullable=False),
                    sa.Column('destroyed', sa.DateTime(), nullable=True),
                    sa.PrimaryKeyConstraint('id', name=op.f('pk_country'))
                    )
    op.create_table('deprecation',
                    sa.Column('id', sa.Integer(), nullable=False),
                    sa.Column('resource_type', sa.String(length=50), nullable=True),
                    sa.Column('resource_id', sa.Integer(), nullable=True),
                    sa.Column('deprecated_at', sa.DateTime(), nullable=False),
                    sa.Column('reason', sa.String(), nullable=False),
                    sa.Column('meta', sa.JSON()),
                    sa.PrimaryKeyConstraint('id', name=op.f('pk_deprecation'))
                    )
    op.create_table('country_origin',
                    sa.Column('country_id', sa.Integer(), nullable=False),
                    sa.Column('origin_id', sa.Integer(), nullable=False),
                    sa.ForeignKeyConstraint(['country_id'], ['country.id'],
                                            name=op.f('fk_country_origin_country_id_country')),
                    sa.ForeignKeyConstraint(['origin_id'], ['origin.id'],
                                            name=op.f('fk_country_origin_origin_id_origin')),
                    sa.PrimaryKeyConstraint('country_id', 'origin_id', name=op.f('pk_country_origin'))
                    )
    with op.batch_alter_table('origin', schema=None) as batch_op:
        batch_op.add_column(sa.Column('risk_level_override', sa.Integer(), nullable=True))

    countries = json.load(open("migrations/countries.json"))

    country_table = table(
        'country',
        column('id', sa.Integer),
        column('country_code', sa.String),
        column('description', sa.String),
        column('risk_level_override', sa.Integer),
        column('added', sa.DateTime),
        column('updated', sa.DateTime),
    )

    # Iterate through each country and insert it using the 'country_table' definition
    for country in countries:
        op.execute(
            country_table.insert().values(
                country_code=country['Code'],
                description=country['Name'],
                risk_level_override=None,  # Assuming risk level override is initially None
                added=func.now(),
                updated=func.now()
            )
        )

    deprecation_table = table('deprecation',
                              column('id', sa.Integer),
                              column('resource_type', sa.String),
                              column('resource_id', sa.Integer),
                              column('deprecated_at', sa.DateTime),
                              column('reason', sa.String)
                              )

    bind = op.get_bind()
    session = Session(bind=bind)

    resource_tables = ['proxy', 'bridge']

    for table_name in resource_tables:
        # Query the existing deprecations
        results = session.execute(
            sa.select(
                column('id'),
                column('deprecated'),
                column('deprecation_reason')
            ).select_from(table(table_name))
        )

        # Iterate over each row and create a corresponding entry in the Deprecation table
        for id_, deprecated, reason in results:
            if deprecated is not None:  # Only migrate if there's a deprecation date
                if isinstance(deprecated, str):
                    deprecated = datetime.strptime(deprecated, "%Y-%m-%d %H:%M:%S.%f")
                op.execute(
                    deprecation_table.insert().values(
                        resource_type=table_name.title(),  # The class name is used, not the table name
                        resource_id=id_,
                        deprecated_at=deprecated,
                        reason=reason
                    )
                )

    session.commit()


def downgrade():
    # ### commands auto generated by Alembic - please adjust! ###
    with op.batch_alter_table('origin', schema=None) as batch_op:
        batch_op.drop_column('risk_level_override')

    op.drop_table('country_origin')
    op.drop_table('deprecation')
    op.drop_table('country')
    # ### end Alembic commands ###