CREATE TABLE IF NOT EXISTS customers (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS projects (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    customer_id BIGINT NOT NULL,
    name VARCHAR(255) NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT fk_projects_customer
        FOREIGN KEY (customer_id) REFERENCES customers(id)
        ON DELETE RESTRICT ON UPDATE CASCADE
);

CREATE TABLE IF NOT EXISTS locations (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    customer_id BIGINT NOT NULL,
    name VARCHAR(255) NOT NULL,
    kind VARCHAR(64) NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT fk_locations_customer
        FOREIGN KEY (customer_id) REFERENCES customers(id)
        ON DELETE RESTRICT ON UPDATE CASCADE
);

CREATE TABLE IF NOT EXISTS lots (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    code VARCHAR(255) NOT NULL,
    description TEXT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY uniq_lots_code (code)
);

CREATE TABLE IF NOT EXISTS assets (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    project_id BIGINT NOT NULL,
    location_id BIGINT NULL,
    name VARCHAR(255) NOT NULL,
    vendor VARCHAR(255) NULL,
    model VARCHAR(255) NULL,
    vendor_serial VARCHAR(255) NOT NULL,
    asset_tag VARCHAR(255) NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT fk_assets_project
        FOREIGN KEY (project_id) REFERENCES projects(id)
        ON DELETE RESTRICT ON UPDATE CASCADE,
    CONSTRAINT fk_assets_location
        FOREIGN KEY (location_id) REFERENCES locations(id)
        ON DELETE SET NULL ON UPDATE CASCADE
);

CREATE TABLE IF NOT EXISTS components (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    lot_id BIGINT NULL,
    vendor VARCHAR(255) NULL,
    model VARCHAR(255) NULL,
    vendor_serial VARCHAR(255) NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT fk_components_lot
        FOREIGN KEY (lot_id) REFERENCES lots(id)
        ON DELETE SET NULL ON UPDATE CASCADE
);

CREATE TABLE IF NOT EXISTS installations (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    asset_id BIGINT NOT NULL,
    component_id BIGINT NOT NULL,
    installed_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    removed_at TIMESTAMP NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    CONSTRAINT fk_installations_asset
        FOREIGN KEY (asset_id) REFERENCES assets(id)
        ON DELETE RESTRICT ON UPDATE CASCADE,
    CONSTRAINT fk_installations_component
        FOREIGN KEY (component_id) REFERENCES components(id)
        ON DELETE RESTRICT ON UPDATE CASCADE
);

CREATE INDEX idx_assets_vendor_serial ON assets(vendor_serial);
CREATE INDEX idx_components_vendor_serial ON components(vendor_serial);
CREATE INDEX idx_installations_component_removed ON installations(component_id, removed_at);

CREATE INDEX idx_projects_customer ON projects(customer_id);
CREATE INDEX idx_assets_project ON assets(project_id);
CREATE INDEX idx_assets_location ON assets(location_id);
CREATE INDEX idx_components_lot ON components(lot_id);