-- FR24 External data schema
-- Phase 2, Step 1: Airport schedule (Yandex.Rasp + OpenSky)

CREATE SCHEMA IF NOT EXISTS fr24_ext;

-- Airport schedule (merged from Yandex + OpenSky)
CREATE TABLE IF NOT EXISTS fr24_ext.schedule (
    schedule_id     BIGSERIAL PRIMARY KEY,
    flight_date     DATE NOT NULL,
    airport_iata    CHAR(3) NOT NULL,
    direction       VARCHAR(10) NOT NULL CHECK (direction IN ('arrival', 'departure')),
    flight_number   VARCHAR(10) NOT NULL,
    airline_iata    CHAR(2),
    airline_name    VARCHAR(100),
    origin_iata     CHAR(3),
    destination_iata CHAR(3),
    aircraft_type   VARCHAR(10),
    scheduled_at    TIMESTAMPTZ NOT NULL,
    estimated_at    TIMESTAMPTZ,
    actual_at       TIMESTAMPTZ,
    status          VARCHAR(20) DEFAULT 'scheduled'
                        CHECK (status IN ('scheduled', 'delayed', 'cancelled', 'departed', 'arrived')),
    icao24          CHAR(6),
    source          VARCHAR(20) NOT NULL CHECK (source IN ('yandex', 'opensky', 'merged')),
    fetched_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    UNIQUE (flight_number, airport_iata, scheduled_at, direction)
);

CREATE INDEX IF NOT EXISTS idx_schedule_date     ON fr24_ext.schedule (flight_date);
CREATE INDEX IF NOT EXISTS idx_schedule_airport  ON fr24_ext.schedule (airport_iata);
CREATE INDEX IF NOT EXISTS idx_schedule_flight   ON fr24_ext.schedule (flight_number);
CREATE INDEX IF NOT EXISTS idx_schedule_time     ON fr24_ext.schedule (scheduled_at);
CREATE INDEX IF NOT EXISTS idx_schedule_dir      ON fr24_ext.schedule (direction);
CREATE INDEX IF NOT EXISTS idx_schedule_status   ON fr24_ext.schedule (status);

-- Load state / backfill cursor
CREATE TABLE IF NOT EXISTS fr24_ext.load_state (
    state_key   VARCHAR(50) PRIMARY KEY,
    state_value JSONB NOT NULL,
    updated_at  TIMESTAMPTZ NOT NULL DEFAULT now()
);

COMMENT ON TABLE fr24_ext.schedule    IS 'Airport schedule from Yandex.Rasp + OpenSky, T-1 mode';
COMMENT ON TABLE fr24_ext.load_state  IS 'Backfill cursor and load progress tracking';