CREATE DATABASE IF NOT EXISTS otb_billing
  CHARACTER SET utf8mb4
  COLLATE utf8mb4_unicode_ci;

USE otb_billing;

SET FOREIGN_KEY_CHECKS=0;

DROP TABLE IF EXISTS audit_log;
DROP TABLE IF EXISTS payments;
DROP TABLE IF EXISTS invoice_items;
DROP TABLE IF EXISTS invoices;
DROP TABLE IF EXISTS services;
DROP TABLE IF EXISTS clients;

SET FOREIGN_KEY_CHECKS=1;

CREATE TABLE clients (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    client_code VARCHAR(50) NOT NULL,
    company_name VARCHAR(255) NOT NULL,
    contact_name VARCHAR(255) DEFAULT NULL,
    email VARCHAR(255) DEFAULT NULL,
    phone VARCHAR(50) DEFAULT NULL,
    status ENUM('lead','active','inactive','suspended') NOT NULL DEFAULT 'active',
    notes TEXT DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uq_clients_client_code (client_code),
    KEY idx_clients_company_name (company_name),
    KEY idx_clients_status (status)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE services (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    client_id INT UNSIGNED NOT NULL,
    service_code VARCHAR(50) NOT NULL,
    service_name VARCHAR(255) NOT NULL,
    service_type ENUM('hosting','rpc','explorer','node','ipfs','consulting','other') NOT NULL DEFAULT 'other',
    billing_cycle ENUM('one_time','monthly','quarterly','yearly','manual') NOT NULL DEFAULT 'monthly',
    status ENUM('pending','active','suspended','cancelled') NOT NULL DEFAULT 'pending',
    currency_code VARCHAR(16) NOT NULL DEFAULT 'CAD',
    recurring_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    start_date DATE DEFAULT NULL,
    end_date DATE DEFAULT NULL,
    description TEXT DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uq_services_service_code (service_code),
    KEY idx_services_client_id (client_id),
    KEY idx_services_status (status),
    CONSTRAINT fk_services_client
        FOREIGN KEY (client_id) REFERENCES clients(id)
        ON DELETE RESTRICT
        ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE invoices (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    client_id INT UNSIGNED NOT NULL,
    service_id INT UNSIGNED DEFAULT NULL,
    invoice_number VARCHAR(50) NOT NULL,
    currency_code VARCHAR(16) NOT NULL DEFAULT 'CAD',
    subtotal_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    tax_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    total_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    amount_paid DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    status ENUM('draft','pending','paid','partial','overdue','cancelled') NOT NULL DEFAULT 'draft',
    issued_at DATETIME DEFAULT NULL,
    due_at DATETIME DEFAULT NULL,
    paid_at DATETIME DEFAULT NULL,
    notes TEXT DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uq_invoices_invoice_number (invoice_number),
    KEY idx_invoices_client_id (client_id),
    KEY idx_invoices_service_id (service_id),
    KEY idx_invoices_status (status),
    KEY idx_invoices_due_at (due_at),
    CONSTRAINT fk_invoices_client
        FOREIGN KEY (client_id) REFERENCES clients(id)
        ON DELETE RESTRICT
        ON UPDATE CASCADE,
    CONSTRAINT fk_invoices_service
        FOREIGN KEY (service_id) REFERENCES services(id)
        ON DELETE SET NULL
        ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE invoice_items (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    invoice_id INT UNSIGNED NOT NULL,
    line_number INT UNSIGNED NOT NULL DEFAULT 1,
    item_type ENUM('service','setup','credit','discount','manual','other') NOT NULL DEFAULT 'service',
    description VARCHAR(255) NOT NULL,
    quantity DECIMAL(18,4) NOT NULL DEFAULT 1.0000,
    unit_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    line_total DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    currency_code VARCHAR(16) NOT NULL DEFAULT 'CAD',
    service_id INT UNSIGNED DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    KEY idx_invoice_items_invoice_id (invoice_id),
    KEY idx_invoice_items_service_id (service_id),
    CONSTRAINT fk_invoice_items_invoice
        FOREIGN KEY (invoice_id) REFERENCES invoices(id)
        ON DELETE CASCADE
        ON UPDATE CASCADE,
    CONSTRAINT fk_invoice_items_service
        FOREIGN KEY (service_id) REFERENCES services(id)
        ON DELETE SET NULL
        ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE payments (
    id INT UNSIGNED NOT NULL AUTO_INCREMENT,
    invoice_id INT UNSIGNED NOT NULL,
    client_id INT UNSIGNED NOT NULL,
    payment_method ENUM(
        'square',
        'etransfer',
        'crypto_etho',
        'crypto_egaz',
        'crypto_alt',
        'cash',
        'other'
    ) NOT NULL,
    payment_currency VARCHAR(16) NOT NULL,
    payment_amount DECIMAL(18,8) NOT NULL DEFAULT 0.00000000,
    cad_value_at_payment DECIMAL(18,8) DEFAULT NULL,
    exchange_rate_note VARCHAR(255) DEFAULT NULL,
    reference VARCHAR(255) DEFAULT NULL,
    sender_name VARCHAR(255) DEFAULT NULL,
    txid VARCHAR(255) DEFAULT NULL,
    wallet_address VARCHAR(255) DEFAULT NULL,
    confirmations INT UNSIGNED DEFAULT NULL,
    confirmation_required INT UNSIGNED DEFAULT NULL,
    payment_status ENUM('pending','confirmed','failed','reversed') NOT NULL DEFAULT 'confirmed',
    received_at DATETIME DEFAULT NULL,
    notes TEXT DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    KEY idx_payments_invoice_id (invoice_id),
    KEY idx_payments_client_id (client_id),
    KEY idx_payments_method (payment_method),
    KEY idx_payments_status (payment_status),
    KEY idx_payments_txid (txid),
    CONSTRAINT fk_payments_invoice
        FOREIGN KEY (invoice_id) REFERENCES invoices(id)
        ON DELETE RESTRICT
        ON UPDATE CASCADE,
    CONSTRAINT fk_payments_client
        FOREIGN KEY (client_id) REFERENCES clients(id)
        ON DELETE RESTRICT
        ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE audit_log (
    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    entity_type ENUM('client','service','invoice','payment','system') NOT NULL,
    entity_id INT UNSIGNED DEFAULT NULL,
    action VARCHAR(100) NOT NULL,
    actor VARCHAR(100) NOT NULL DEFAULT 'system',
    details TEXT DEFAULT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    KEY idx_audit_entity (entity_type, entity_id),
    KEY idx_audit_action (action),
    KEY idx_audit_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;