package com.test.payment.models;

import java.util.List;

/**
 * The database schema as code — executed statement-by-statement at startup by
 * DatabaseSchemaInitializer (replaces the old classpath schema.sql).
 */
public final class DatabaseSchema {

    private DatabaseSchema() {
    }

    public static final List<String> STATEMENTS = List.of(
            """
            CREATE TABLE IF NOT EXISTS provider_tokens (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                provider VARCHAR(20) NOT NULL,
                access_token VARCHAR(512) NOT NULL,
                expires_at TIMESTAMP NOT NULL,
                created_at TIMESTAMP NOT NULL
            )
            """,
            """
            CREATE TABLE IF NOT EXISTS payment_initiations (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                provider VARCHAR(20) NOT NULL,
                phone_number VARCHAR(15) NOT NULL,
                amount DECIMAL(10,2) NOT NULL,
                account_reference VARCHAR(50),
                transaction_desc VARCHAR(100),
                status VARCHAR(20) NOT NULL,
                created_at TIMESTAMP NOT NULL,
                updated_at TIMESTAMP
            )
            """,
            """
            CREATE INDEX IF NOT EXISTS idx_initiations_status_created
                ON payment_initiations (status, created_at)
            """,
            // One response per initiation (UNIQUE on initiation_id enforces the 1:1 link).
            // provider_reference is the ID used for callbacks/status checks
            // (M-Pesa CheckoutRequestID, Airtel transaction id, MTN X-Reference-Id).
            """
            CREATE TABLE IF NOT EXISTS payment_responses (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                initiation_id BIGINT NOT NULL UNIQUE,
                provider VARCHAR(20) NOT NULL,
                provider_reference VARCHAR(100) UNIQUE,
                secondary_reference VARCHAR(100),
                response_code VARCHAR(30),
                response_description VARCHAR(255),
                customer_message VARCHAR(255),
                created_at TIMESTAMP NOT NULL,
                CONSTRAINT fk_response_initiation FOREIGN KEY (initiation_id) REFERENCES payment_initiations (id)
            )
            """,
            // One callback per initiation (UNIQUE on initiation_id enforces the 1:1 link)
            """
            CREATE TABLE IF NOT EXISTS payment_callbacks (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                initiation_id BIGINT NOT NULL UNIQUE,
                provider VARCHAR(20) NOT NULL,
                provider_reference VARCHAR(100),
                result_code VARCHAR(30),
                result_desc VARCHAR(255),
                receipt_number VARCHAR(50),
                amount DECIMAL(10,2),
                phone_number VARCHAR(15),
                transaction_date VARCHAR(20),
                raw_payload CLOB,
                created_at TIMESTAMP NOT NULL,
                CONSTRAINT fk_callback_initiation FOREIGN KEY (initiation_id) REFERENCES payment_initiations (id)
            )
            """,
            // Consolidated transaction record, written when an initiation reaches a
            // terminal state (SUCCESS/FAILED). UNIQUE initiation_id: one per initiation.
            """
            CREATE TABLE IF NOT EXISTS transactions (
                id BIGINT AUTO_INCREMENT PRIMARY KEY,
                initiation_id BIGINT NOT NULL UNIQUE,
                provider VARCHAR(20) NOT NULL,
                provider_reference VARCHAR(100),
                secondary_reference VARCHAR(100),
                phone_number VARCHAR(15),
                amount DECIMAL(10,2),
                account_reference VARCHAR(50),
                status VARCHAR(20) NOT NULL,
                result_code VARCHAR(30),
                result_desc VARCHAR(255),
                receipt_number VARCHAR(50),
                transaction_date VARCHAR(20),
                resolved_by VARCHAR(20),
                created_at TIMESTAMP NOT NULL,
                updated_at TIMESTAMP,
                CONSTRAINT fk_transaction_initiation FOREIGN KEY (initiation_id) REFERENCES payment_initiations (id)
            )
            """
    );
}