"""Add system_settings table

Revision ID: 002_system_settings
Revises: 001_initial
Create Date: 2026-04-02
"""
from alembic import op
import sqlalchemy as sa

revision = "002_system_settings"
down_revision = "001_initial"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "system_settings",
        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
        sa.Column("key", sa.String(100), unique=True, nullable=False, index=True),
        sa.Column("value", sa.Text, nullable=False, server_default=""),
        sa.Column("description", sa.String(255)),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
    )

    # Seed default settings
    op.execute("""
        INSERT INTO system_settings (key, value, description) VALUES
        ('platform_name', '天普零碳园区智慧能源管理平台', '平台名称'),
        ('data_retention_days', '365', '数据保留天数'),
        ('alarm_auto_resolve_minutes', '30', '告警自动解除时间(分钟)'),
        ('simulator_interval_seconds', '15', '模拟器采集间隔(秒)'),
        ('notification_email_enabled', 'false', '是否启用邮件通知'),
        ('notification_email_smtp', '', 'SMTP服务器地址'),
        ('report_auto_schedule_enabled', 'false', '是否启用自动报表'),
        ('timezone', 'Asia/Shanghai', '系统时区')
    """)


def downgrade() -> None:
    op.drop_table("system_settings")