-- Migration: 013_CreditNotes.sql
-- Description: Credit notes for reversing/correcting invoices
-- Date: 2026-01-18

-- Credit note read models
CREATE TABLE IF NOT EXISTS credit_note_read_models (
    aggregate_id VARCHAR(255) PRIMARY KEY,
    company_id VARCHAR(255) NOT NULL,
    fiscal_year_id VARCHAR(255),
    customer_id VARCHAR(255) NOT NULL,
    customer_name VARCHAR(255) NOT NULL,
    credit_note_number VARCHAR(50) NOT NULL,
    original_invoice_id VARCHAR(255),
    original_invoice_number VARCHAR(50),
    credit_note_date DATE NOT NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'Draft',

    -- Amounts
    amount_ex_vat DECIMAL(18, 2) NOT NULL DEFAULT 0,
    amount_vat DECIMAL(18, 2) NOT NULL DEFAULT 0,
    amount_total DECIMAL(18, 2) NOT NULL DEFAULT 0,
    amount_applied DECIMAL(18, 2) NOT NULL DEFAULT 0,
    amount_remaining DECIMAL(18, 2) NOT NULL DEFAULT 0,

    -- Lines stored as JSONB for flexibility
    lines JSONB NOT NULL DEFAULT '[]'::jsonb,

    -- Ledger integration
    ledger_transaction_id VARCHAR(255),

    -- Audit fields
    reason TEXT,
    issued_at TIMESTAMP WITH TIME ZONE,
    voided_at TIMESTAMP WITH TIME ZONE,
    voided_reason TEXT,

    -- EventFlow fields
    create_time TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    update_time TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    last_aggregate_sequence_number BIGINT NOT NULL DEFAULT 0
);

-- Indexes for common queries
CREATE INDEX IF NOT EXISTS idx_credit_note_read_models_company_id
    ON credit_note_read_models(company_id);

CREATE INDEX IF NOT EXISTS idx_credit_note_read_models_customer_id
    ON credit_note_read_models(customer_id);

CREATE INDEX IF NOT EXISTS idx_credit_note_read_models_status
    ON credit_note_read_models(status);

CREATE INDEX IF NOT EXISTS idx_credit_note_read_models_original_invoice
    ON credit_note_read_models(original_invoice_id);

CREATE INDEX IF NOT EXISTS idx_credit_note_read_models_date
    ON credit_note_read_models(credit_note_date);

-- Unique constraint: credit note number must be unique per company
CREATE UNIQUE INDEX IF NOT EXISTS idx_credit_note_read_models_number_unique
    ON credit_note_read_models(company_id, credit_note_number);

-- Credit note applications (when credit is applied to invoices)
CREATE TABLE IF NOT EXISTS credit_note_applications (
    id TEXT PRIMARY KEY,
    company_id VARCHAR(255) NOT NULL,
    credit_note_id VARCHAR(255) NOT NULL,
    invoice_id VARCHAR(255) NOT NULL,
    amount DECIMAL(18, 2) NOT NULL,
    applied_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    applied_by VARCHAR(255) NOT NULL,
    ledger_transaction_id VARCHAR(255),

    CONSTRAINT fk_credit_note_applications_credit_note
        FOREIGN KEY (credit_note_id) REFERENCES credit_note_read_models(aggregate_id),
    CONSTRAINT fk_credit_note_applications_invoice
        FOREIGN KEY (invoice_id) REFERENCES invoice_read_models(aggregate_id)
);

CREATE INDEX IF NOT EXISTS idx_credit_note_applications_credit_note
    ON credit_note_applications(credit_note_id);

CREATE INDEX IF NOT EXISTS idx_credit_note_applications_invoice
    ON credit_note_applications(invoice_id);