CREATE TABLE business_partners (
    id BIGINT NOT NULL AUTO_INCREMENT,
    legal_name VARCHAR(200) NOT NULL,
    unified_credit_code VARCHAR(50) NULL,
    contact_name VARCHAR(100) NULL,
    contact_phone VARCHAR(50) NULL,
    address VARCHAR(500) NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uk_business_partners_credit_code (unified_credit_code)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE organization_partners (
    id BIGINT NOT NULL AUTO_INCREMENT,
    organization_id BIGINT NOT NULL,
    business_partner_id BIGINT NOT NULL,
    partner_code VARCHAR(50) NOT NULL,
    is_supplier BOOLEAN NOT NULL DEFAULT FALSE,
    is_customer BOOLEAN NOT NULL DEFAULT FALSE,
    supplier_status VARCHAR(20) NULL,
    customer_status VARCHAR(20) NULL,
    settlement_currency CHAR(3) NULL,
    payment_terms VARCHAR(200) NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    UNIQUE KEY uk_organization_partners_org_partner (organization_id, business_partner_id),
    UNIQUE KEY uk_organization_partners_org_code (organization_id, partner_code),
    CONSTRAINT fk_organization_partners_org FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE RESTRICT,
    CONSTRAINT fk_organization_partners_partner FOREIGN KEY (business_partner_id) REFERENCES business_partners(id) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE material_suppliers (
    id BIGINT NOT NULL AUTO_INCREMENT,
    organization_id BIGINT NOT NULL,
    material_id BIGINT NOT NULL,
    organization_partner_id BIGINT NOT NULL,
    price DECIMAL(20,6) NOT NULL,
    currency CHAR(3) NOT NULL,
    minimum_order_quantity DECIMAL(20,6) NOT NULL DEFAULT 0,
    lead_time_days INT NOT NULL DEFAULT 0,
    is_preferred BOOLEAN NOT NULL DEFAULT FALSE,
    effective_from DATE NOT NULL,
    effective_to DATE NULL,
    status VARCHAR(20) NOT NULL DEFAULT 'active',
    PRIMARY KEY (id),
    KEY idx_material_suppliers_material (organization_id, material_id),
    CONSTRAINT fk_material_suppliers_org FOREIGN KEY (organization_id) REFERENCES organizations(id) ON DELETE RESTRICT,
    CONSTRAINT fk_material_suppliers_material FOREIGN KEY (material_id) REFERENCES materials(id) ON DELETE RESTRICT,
    CONSTRAINT fk_material_suppliers_partner FOREIGN KEY (organization_partner_id) REFERENCES organization_partners(id) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;