-- Migration 171: Supplier invoice v2 lifecycle (status, approval, split payments, event log)
-- Created: 2026-04-12

ALTER TABLE supplier_invoices
ADD COLUMN IF NOT EXISTS workflow_status_v2 VARCHAR(20),
ADD COLUMN IF NOT EXISTS rejected_by VARCHAR(255),
ADD COLUMN IF NOT EXISTS rejected_at TIMESTAMP,
ADD COLUMN IF NOT EXISTS rejection_reason TEXT,
ADD COLUMN IF NOT EXISTS payment_method VARCHAR(100);

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1
        FROM pg_constraint
        WHERE conname = 'chk_supplier_invoices_workflow_status_v2'
    ) THEN
        ALTER TABLE supplier_invoices
        ADD CONSTRAINT chk_supplier_invoices_workflow_status_v2
        CHECK (workflow_status_v2 IN ('modtaget', 'godkendt', 'betalt', 'afvist'));
    END IF;
END $$;

-- Backfill v2 statuses from legacy status values.
UPDATE supplier_invoices
SET workflow_status_v2 = CASE
    WHEN status IN ('approved', 'sent_to_economic') THEN 'godkendt'
    WHEN status = 'paid' THEN 'betalt'
    WHEN status IN ('cancelled', 'credited', 'rejected') THEN 'afvist'
    ELSE 'modtaget'
END
WHERE workflow_status_v2 IS NULL;

ALTER TABLE supplier_invoices
ALTER COLUMN workflow_status_v2 SET DEFAULT 'modtaget';

ALTER TABLE supplier_invoices
ALTER COLUMN workflow_status_v2 SET NOT NULL;

CREATE INDEX IF NOT EXISTS idx_supplier_invoices_workflow_status_v2
ON supplier_invoices(workflow_status_v2);

-- Split payments on supplier invoices.
CREATE TABLE IF NOT EXISTS supplier_invoice_payments (
    id SERIAL PRIMARY KEY,
    supplier_invoice_id INTEGER NOT NULL REFERENCES supplier_invoices(id) ON DELETE CASCADE,
    payment_date DATE NOT NULL,
    amount DECIMAL(15, 2) NOT NULL CHECK (amount > 0),
    currency VARCHAR(10) NOT NULL DEFAULT 'DKK',
    payment_method VARCHAR(100),
    payment_reference VARCHAR(100),
    notes TEXT,
    paid_by VARCHAR(255),
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_supplier_invoice_payments_invoice_id
ON supplier_invoice_payments(supplier_invoice_id);

CREATE INDEX IF NOT EXISTS idx_supplier_invoice_payments_date
ON supplier_invoice_payments(payment_date);

-- Event log / outbox-style table for later webhook activation.
CREATE TABLE IF NOT EXISTS supplier_invoice_events (
    id BIGSERIAL PRIMARY KEY,
    supplier_invoice_id INTEGER NOT NULL REFERENCES supplier_invoices(id) ON DELETE CASCADE,
    event_type VARCHAR(60) NOT NULL,
    from_status VARCHAR(20),
    to_status VARCHAR(20),
    payload_json JSONB NOT NULL DEFAULT '{}'::jsonb,
    webhook_status VARCHAR(20) NOT NULL DEFAULT 'pending',
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    processed_at TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_supplier_invoice_events_invoice_id
ON supplier_invoice_events(supplier_invoice_id);

CREATE INDEX IF NOT EXISTS idx_supplier_invoice_events_webhook_status
ON supplier_invoice_events(webhook_status);

COMMENT ON COLUMN supplier_invoices.workflow_status_v2 IS 'v2 lifecycle: modtaget, godkendt, betalt, afvist';
COMMENT ON TABLE supplier_invoice_payments IS 'Partial/split payments for supplier invoices';
COMMENT ON TABLE supplier_invoice_events IS 'Supplier invoice event log prepared for future webhook/outbox processing';