"""Initial schema

Revision ID: 001
Revises:
Create Date: 2025-01-24

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql

revision: str = '001'
down_revision: Union[str, None] = None
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Sources table
    op.create_table(
        'sources',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('name', sa.String(255), nullable=False),
        sa.Column('platform', sa.String(50), nullable=False),
        sa.Column('url', sa.Text(), nullable=False),
        sa.Column('enabled', sa.Boolean(), default=True),
        sa.Column('priority', sa.Integer(), default=0),
        sa.Column('check_interval', sa.Integer(), default=28800),
        sa.Column('last_check', sa.DateTime(), nullable=True),
        sa.Column('last_success', sa.DateTime(), nullable=True),
        sa.Column('error_count', sa.Integer(), default=0),
        sa.Column('metadata', postgresql.JSONB(), default={}),
        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('platform', 'url', name='uq_source_platform_url')
    )
    op.create_index('ix_sources_platform', 'sources', ['platform'])

    # Downloads table
    op.create_table(
        'downloads',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('source_id', sa.Integer(), nullable=True),
        sa.Column('url', sa.Text(), nullable=False),
        sa.Column('status', sa.String(20), default='pending'),
        sa.Column('error_type', sa.String(50), nullable=True),
        sa.Column('error_message', sa.Text(), nullable=True),
        sa.Column('file_count', sa.Integer(), default=0),
        sa.Column('total_size', sa.BigInteger(), nullable=True),
        sa.Column('started_at', sa.DateTime(), nullable=True),
        sa.Column('completed_at', sa.DateTime(), nullable=True),
        sa.Column('metadata', postgresql.JSONB(), default={}),
        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('id'),
        sa.ForeignKeyConstraint(['source_id'], ['sources.id'], ondelete='SET NULL')
    )
    op.create_index('ix_downloads_status', 'downloads', ['status'])
    op.create_index('ix_downloads_source_id', 'downloads', ['source_id'])

    # Content items table
    op.create_table(
        'content_items',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('source_id', sa.Integer(), nullable=False),
        sa.Column('download_id', sa.Integer(), nullable=True),
        sa.Column('external_id', sa.String(255), nullable=True),
        sa.Column('title', sa.String(500), nullable=True),
        sa.Column('content_type', sa.String(50), default='other'),
        sa.Column('file_path', sa.String(500), nullable=True),
        sa.Column('file_size', sa.BigInteger(), nullable=True),
        sa.Column('thumbnail_path', sa.String(500), nullable=True),
        sa.Column('published_at', sa.DateTime(), nullable=True),
        sa.Column('discovered_at', sa.DateTime(), server_default=sa.func.now()),
        sa.Column('metadata', postgresql.JSONB(), default={}),
        sa.PrimaryKeyConstraint('id'),
        sa.ForeignKeyConstraint(['source_id'], ['sources.id'], ondelete='CASCADE'),
        sa.ForeignKeyConstraint(['download_id'], ['downloads.id'], ondelete='SET NULL'),
        sa.UniqueConstraint('source_id', 'external_id', name='uq_content_source_external')
    )
    op.create_index('ix_content_items_source_id', 'content_items', ['source_id'])
    op.create_index('ix_content_items_discovered_at', 'content_items', ['discovered_at'])

    # Credentials table
    op.create_table(
        'credentials',
        sa.Column('id', sa.Integer(), nullable=False),
        sa.Column('platform', sa.String(50), nullable=False),
        sa.Column('credential_type', sa.String(20), nullable=False),
        sa.Column('data', sa.LargeBinary(), nullable=False),
        sa.Column('expires_at', sa.DateTime(), nullable=True),
        sa.Column('last_verified', sa.DateTime(), nullable=True),
        sa.Column('created_at', sa.DateTime(), server_default=sa.func.now()),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('id'),
        sa.UniqueConstraint('platform', name='uq_credential_platform')
    )
    op.create_index('ix_credentials_platform', 'credentials', ['platform'])

    # Settings table
    op.create_table(
        'settings',
        sa.Column('key', sa.String(100), nullable=False),
        sa.Column('value', postgresql.JSONB(), nullable=False),
        sa.Column('updated_at', sa.DateTime(), server_default=sa.func.now(), onupdate=sa.func.now()),
        sa.PrimaryKeyConstraint('key')
    )

    # Insert default settings
    op.execute("""
        INSERT INTO settings (key, value) VALUES
        ('download.parallel_limit', '3'),
        ('download.rate_limit', '3.0'),
        ('download.retry_count', '3'),
        ('download.schedule_interval', '28800'),
        ('notification.enabled', 'false'),
        ('notification.webhook_url', 'null')
    """)


def downgrade() -> None:
    op.drop_table('settings')
    op.drop_table('credentials')
    op.drop_table('content_items')
    op.drop_table('downloads')
    op.drop_table('sources')