"""add skill tags, user_skill_bindings, user_workloads tables

Revision ID: add_skill_tables
Revises: add_projects_and_signal_links
Create Date: 2024-02-24

"""
from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.dialects import sqlite

# revision identifiers, used by Alembic.
revision = 'add_skill_tables'
down_revision = 'add_projects_001'
branch_labels = None
depends_on = None


def get_uuid_column():
    """Return UUID column appropriate for database."""
    import os
    if "sqlite" in os.getenv("DATABASE_URL", ""):
        return sa.CHAR(36)
    return UUID(as_uuid=True)


def upgrade():
    uuid_col = get_uuid_column()

    op.create_table(
        'skill_tags',
        sa.Column('id', uuid_col, primary_key=True),
        sa.Column('tenant_id', sa.String(50), nullable=False, index=True),
        sa.Column('name', sa.String(100), nullable=False, index=True),
        sa.Column('slug', sa.String(80), nullable=False, index=True),
        sa.Column('category', sa.String(50), nullable=True),
        sa.Column('description', sa.Text(), nullable=True),
        sa.Column('is_system', sa.Boolean(), default=False),
        sa.Column('sort_order', sa.Integer(), default=0),
        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()),
    )

    op.create_table(
        'user_skill_bindings',
        sa.Column('id', uuid_col, primary_key=True),
        sa.Column('tenant_id', sa.String(50), nullable=False, index=True),
        sa.Column('user_id', uuid_col, sa.ForeignKey('users.id'), nullable=False, index=True),
        sa.Column('skill_tag_id', uuid_col, sa.ForeignKey('skill_tags.id'), nullable=False, index=True),
        sa.Column('proficiency', sa.Integer(), default=50),
        sa.Column('level', sa.String(20), default='intermediate'),
        sa.Column('years_experience', sa.Float(), nullable=True),
        sa.Column('last_used_at', 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()),
    )

    op.create_table(
        'user_workloads',
        sa.Column('id', uuid_col, primary_key=True),
        sa.Column('tenant_id', sa.String(50), nullable=False, index=True),
        sa.Column('user_id', uuid_col, sa.ForeignKey('users.id'), nullable=False, index=True),
        sa.Column('total_tasks', sa.Integer(), default=0),
        sa.Column('completed_tasks', sa.Integer(), default=0),
        sa.Column('in_progress_tasks', sa.Integer(), default=0),
        sa.Column('estimated_hours', sa.Float(), default=0.0),
        sa.Column('completed_hours', sa.Float(), default=0.0),
        sa.Column('workload_rate', sa.Float(), default=0.0),
        sa.Column('period_start', sa.DateTime(), nullable=False),
        sa.Column('period_end', sa.DateTime(), nullable=False),
        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()),
    )


def downgrade():
    op.drop_table('user_workloads')
    op.drop_table('user_skill_bindings')
    op.drop_table('skill_tags')