-- ============================================================================
-- TRADING SCHEMA - Tabla: paper_balances
-- ============================================================================
-- Balances virtuales para paper trading
-- Permite a usuarios practicar sin riesgo real
-- ============================================================================

CREATE TABLE IF NOT EXISTS trading.paper_balances (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

    -- Usuario
    user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,

    -- Asset y balance
    asset VARCHAR(10) NOT NULL DEFAULT 'USDT',
    total DECIMAL(20, 8) NOT NULL DEFAULT 10000.00,
    available DECIMAL(20, 8) NOT NULL DEFAULT 10000.00,
    locked DECIMAL(20, 8) NOT NULL DEFAULT 0,

    -- Tracking
    initial_balance DECIMAL(20, 8) NOT NULL DEFAULT 10000.00,
    total_deposits DECIMAL(20, 8) NOT NULL DEFAULT 0,
    total_withdrawals DECIMAL(20, 8) NOT NULL DEFAULT 0,
    total_pnl DECIMAL(20, 8) NOT NULL DEFAULT 0,

    -- Reset tracking
    last_reset_at TIMESTAMPTZ,
    reset_count INTEGER NOT NULL DEFAULT 0,

    -- Timestamps
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

    -- Constraints
    CONSTRAINT uq_paper_balances_user_asset UNIQUE(user_id, asset),
    CONSTRAINT chk_balance_consistency CHECK (total = available + locked),
    CONSTRAINT chk_balance_non_negative CHECK (total >= 0 AND available >= 0 AND locked >= 0),
    CONSTRAINT chk_initial_positive CHECK (initial_balance > 0)
);

-- Indices
CREATE INDEX idx_paper_balances_user ON trading.paper_balances(user_id);
CREATE INDEX idx_paper_balances_asset ON trading.paper_balances(asset);

-- Comentarios
COMMENT ON TABLE trading.paper_balances IS 'Balances virtuales para paper trading - cada usuario tiene balance por asset';
COMMENT ON COLUMN trading.paper_balances.total IS 'Balance total = available + locked';
COMMENT ON COLUMN trading.paper_balances.available IS 'Balance disponible para nuevas ordenes';
COMMENT ON COLUMN trading.paper_balances.locked IS 'Balance bloqueado en ordenes abiertas';
COMMENT ON COLUMN trading.paper_balances.initial_balance IS 'Balance inicial (default $10,000 USDT)';
COMMENT ON COLUMN trading.paper_balances.reset_count IS 'Numero de veces que el usuario ha reseteado su balance';