"""Add platform modules table

Revision ID: zc2m3n4o5p6q7
Revises: zb1l2m3n4o5p6
Create Date: 2026-01-26

Adds platform_modules junction table for tracking module enablement per platform:
- Auditability: Track when modules were enabled/disabled and by whom
- Configuration: Per-module settings specific to each platform
- State tracking: Explicit enabled/disabled states with timestamps

This replaces the simpler Platform.settings["enabled_modules"] JSON approach
for better auditability and query capabilities.
"""

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision = "zc2m3n4o5p6q7"
down_revision = "zb1l2m3n4o5p6"
branch_labels = None
depends_on = None


def upgrade() -> None:
    # Create platform_modules table
    op.create_table(
        "platform_modules",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column(
            "platform_id",
            sa.Integer(),
            nullable=False,
            comment="Platform this module configuration belongs to",
        ),
        sa.Column(
            "module_code",
            sa.String(50),
            nullable=False,
            comment="Module code (e.g., 'billing', 'inventory', 'orders')",
        ),
        sa.Column(
            "is_enabled",
            sa.Boolean(),
            nullable=False,
            server_default="true",
            comment="Whether this module is currently enabled for the platform",
        ),
        sa.Column(
            "enabled_at",
            sa.DateTime(timezone=True),
            nullable=True,
            comment="When the module was last enabled",
        ),
        sa.Column(
            "enabled_by_user_id",
            sa.Integer(),
            nullable=True,
            comment="User who enabled the module",
        ),
        sa.Column(
            "disabled_at",
            sa.DateTime(timezone=True),
            nullable=True,
            comment="When the module was last disabled",
        ),
        sa.Column(
            "disabled_by_user_id",
            sa.Integer(),
            nullable=True,
            comment="User who disabled the module",
        ),
        sa.Column(
            "config",
            sa.JSON(),
            nullable=False,
            server_default="{}",
            comment="Module-specific configuration for this platform",
        ),
        sa.Column(
            "created_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
        ),
        sa.Column(
            "updated_at",
            sa.DateTime(timezone=True),
            nullable=False,
            server_default=sa.func.now(),
            onupdate=sa.func.now(),
        ),
        # Primary key
        sa.PrimaryKeyConstraint("id"),
        # Foreign keys
        sa.ForeignKeyConstraint(
            ["platform_id"],
            ["platforms.id"],
            ondelete="CASCADE",
        ),
        sa.ForeignKeyConstraint(
            ["enabled_by_user_id"],
            ["users.id"],
            ondelete="SET NULL",
        ),
        sa.ForeignKeyConstraint(
            ["disabled_by_user_id"],
            ["users.id"],
            ondelete="SET NULL",
        ),
        # Unique constraint - one config per platform/module pair
        sa.UniqueConstraint("platform_id", "module_code", name="uq_platform_module"),
    )

    # Create indexes for performance
    op.create_index(
        "idx_platform_module_platform_id",
        "platform_modules",
        ["platform_id"],
    )
    op.create_index(
        "idx_platform_module_code",
        "platform_modules",
        ["module_code"],
    )
    op.create_index(
        "idx_platform_module_enabled",
        "platform_modules",
        ["platform_id", "is_enabled"],
    )


def downgrade() -> None:
    # Drop indexes
    op.drop_index("idx_platform_module_enabled", table_name="platform_modules")
    op.drop_index("idx_platform_module_code", table_name="platform_modules")
    op.drop_index("idx_platform_module_platform_id", table_name="platform_modules")

    # Drop table
    op.drop_table("platform_modules")