-- +goose Up
-- +goose StatementBegin

-- DHCP (Kea) — globale Singleton-Settings (node-lokal, wie dns_settings/
-- ntp_settings: ob DIESE Node DHCP betreibt). Subnets/Reservierungen sind
-- geteilte Config und werden repliziert.
CREATE TABLE IF NOT EXISTS dhcp_settings (
    id             INTEGER     PRIMARY KEY DEFAULT 1,
    enabled        BOOLEAN     NOT NULL DEFAULT false,
    default_lease  INTEGER     NOT NULL DEFAULT 3600,
    max_lease      INTEGER     NOT NULL DEFAULT 7200,
    domain_name    TEXT        NOT NULL DEFAULT '',
    dns_servers    TEXT        NOT NULL DEFAULT '',
    created_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT dhcp_settings_singleton CHECK (id = 1)
);
INSERT INTO dhcp_settings (id) VALUES (1) ON CONFLICT DO NOTHING;

-- Subnets: an ein Interface per NAME gebunden (nicht per node-lokaler FK,
-- damit die Replikation nicht an divergierenden interface_id bricht).
CREATE TABLE IF NOT EXISTS dhcp_subnets (
    id             BIGSERIAL   PRIMARY KEY,
    name           TEXT        NOT NULL,
    interface_name TEXT        NOT NULL,
    subnet_cidr    TEXT        NOT NULL,
    pool_start     TEXT        NOT NULL DEFAULT '',
    pool_end       TEXT        NOT NULL DEFAULT '',
    gateway        TEXT        NOT NULL DEFAULT '',
    dns_servers    TEXT        NOT NULL DEFAULT '',
    lease_time     INTEGER,
    active         BOOLEAN     NOT NULL DEFAULT true,
    description    TEXT        NOT NULL DEFAULT '',
    created_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at     TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT dhcp_subnets_name_unique UNIQUE (name)
);

CREATE TABLE IF NOT EXISTS dhcp_reservations (
    id          BIGSERIAL   PRIMARY KEY,
    subnet_id   BIGINT      NOT NULL REFERENCES dhcp_subnets(id) ON DELETE CASCADE,
    name        TEXT        NOT NULL DEFAULT '',
    mac_address TEXT        NOT NULL,
    ip_address  TEXT        NOT NULL,
    hostname    TEXT        NOT NULL DEFAULT '',
    active      BOOLEAN     NOT NULL DEFAULT true,
    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT dhcp_reservations_subnet_mac_unique UNIQUE (subnet_id, mac_address)
);
CREATE INDEX IF NOT EXISTS idx_dhcp_reservations_subnet ON dhcp_reservations(subnet_id);

-- +goose StatementEnd

-- +goose Down
-- +goose StatementBegin

DROP TABLE IF EXISTS dhcp_reservations;
DROP TABLE IF EXISTS dhcp_subnets;
DROP TABLE IF EXISTS dhcp_settings;

-- +goose StatementEnd