"""add_translation_logs_table

Revision ID: g2b3c4d5e6f7
Revises: f1a2b3c4d5e6
Create Date: 2025-12-12 10:00:00.000000

Add translation_logs table to track translation API usage and costs.
"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = 'g2b3c4d5e6f7'
down_revision: Union[str, None] = 'f1a2b3c4d5e6'
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    """Create tool_ocr_translation_logs table."""
    op.create_table(
        'tool_ocr_translation_logs',
        sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
        sa.Column('user_id', sa.Integer(), nullable=False, comment='Foreign key to users table'),
        sa.Column('task_id', sa.String(length=255), nullable=False, comment='Task UUID that was translated'),
        sa.Column('target_lang', sa.String(length=10), nullable=False, comment='Target language code'),
        sa.Column('source_lang', sa.String(length=10), nullable=True, comment='Source language code'),
        sa.Column('input_tokens', sa.Integer(), nullable=False, server_default='0', comment='Number of input tokens used'),
        sa.Column('output_tokens', sa.Integer(), nullable=False, server_default='0', comment='Number of output tokens generated'),
        sa.Column('total_tokens', sa.Integer(), nullable=False, server_default='0', comment='Total tokens (input + output)'),
        sa.Column('total_elements', sa.Integer(), nullable=False, server_default='0', comment='Total elements in document'),
        sa.Column('translated_elements', sa.Integer(), nullable=False, server_default='0', comment='Number of elements translated'),
        sa.Column('total_characters', sa.Integer(), nullable=False, server_default='0', comment='Total characters translated'),
        sa.Column('estimated_cost', sa.Float(), nullable=False, server_default='0.0', comment='Estimated cost in USD'),
        sa.Column('processing_time_seconds', sa.Float(), nullable=False, server_default='0.0', comment='Translation processing time'),
        sa.Column('provider', sa.String(length=50), nullable=False, server_default='dify', comment='Translation provider'),
        sa.Column('created_at', sa.DateTime(), nullable=False, server_default=sa.text('CURRENT_TIMESTAMP')),
        sa.ForeignKeyConstraint(['user_id'], ['tool_ocr_users.id'], ondelete='CASCADE'),
        sa.PrimaryKeyConstraint('id')
    )
    op.create_index(op.f('ix_tool_ocr_translation_logs_id'), 'tool_ocr_translation_logs', ['id'], unique=False)
    op.create_index(op.f('ix_tool_ocr_translation_logs_user_id'), 'tool_ocr_translation_logs', ['user_id'], unique=False)
    op.create_index(op.f('ix_tool_ocr_translation_logs_task_id'), 'tool_ocr_translation_logs', ['task_id'], unique=False)
    op.create_index(op.f('ix_tool_ocr_translation_logs_target_lang'), 'tool_ocr_translation_logs', ['target_lang'], unique=False)
    op.create_index(op.f('ix_tool_ocr_translation_logs_created_at'), 'tool_ocr_translation_logs', ['created_at'], unique=False)


def downgrade() -> None:
    """Drop tool_ocr_translation_logs table."""
    op.drop_index(op.f('ix_tool_ocr_translation_logs_created_at'), table_name='tool_ocr_translation_logs')
    op.drop_index(op.f('ix_tool_ocr_translation_logs_target_lang'), table_name='tool_ocr_translation_logs')
    op.drop_index(op.f('ix_tool_ocr_translation_logs_task_id'), table_name='tool_ocr_translation_logs')
    op.drop_index(op.f('ix_tool_ocr_translation_logs_user_id'), table_name='tool_ocr_translation_logs')
    op.drop_index(op.f('ix_tool_ocr_translation_logs_id'), table_name='tool_ocr_translation_logs')
    op.drop_table('tool_ocr_translation_logs')