-- =============================================================
-- R__059_vw_operating_mode.sql
-- EMS Platform – views pro provozní režimy a heartbeat
-- Repeatable migration
-- =============================================================

-- Aktuální EMS provozní režim per lokalita (PostgREST / UI)
CREATE OR REPLACE VIEW ems.vw_operating_mode AS
SELECT
    s.id                            AS site_id,
    s.code                          AS site_code,
    m.mode_code                     AS active_mode,
    d.name                          AS mode_name,
    d.description                   AS mode_description,
    d.is_autonomous,
    m.activated_at,
    m.activated_by,
    m.valid_until,
    m.previous_mode,
    m.notes                         AS mode_notes
FROM ems.site s
LEFT JOIN ems.site_operating_mode m ON m.site_id = s.id
LEFT JOIN ems.operating_mode_def d ON d.code = m.mode_code
WHERE s.active = true;

COMMENT ON VIEW ems.vw_operating_mode IS
'Aktuální provozní režim EMS per aktivní lokalita (bez telemetrie/heartbeat).';

-- Aktuální stav všech lokalit (pro dashboard a PostgREST)
CREATE OR REPLACE VIEW ems.vw_site_status AS
SELECT
    s.id                            AS site_id,
    s.code                          AS site_code,
    s.name                          AS site_name,
    m.mode_code                     AS active_mode,
    d.name                          AS mode_name,
    d.description                   AS mode_description,
    d.is_autonomous,
    m.activated_at,
    m.activated_by,
    m.valid_until,
    m.previous_mode,
    m.notes                         AS mode_notes,
    -- Heartbeat
    hb.last_seen                    AS ems_last_seen,
    hb.status                       AS ems_status,
    EXTRACT(EPOCH FROM (now() - hb.last_seen))::INT AS ems_age_seconds,
    -- Varování pokud EMS dlouho nepingoval
    CASE
        WHEN hb.last_seen IS NULL                              THEN 'never_seen'
        WHEN now() - hb.last_seen > INTERVAL '5 minutes'      THEN 'stale'
        WHEN now() - hb.last_seen > INTERVAL '2 minutes'      THEN 'delayed'
        ELSE 'ok'
    END                             AS ems_heartbeat_status,
    -- Aktuální telemetrie (snapshot)
    li.pv_power_w,
    li.battery_soc_percent,
    li.battery_power_w,
    li.grid_power_w,
    li.load_power_w,
    li.measured_at                  AS telemetry_at
FROM ems.site s
LEFT JOIN ems.site_operating_mode m    ON m.site_id = s.id
LEFT JOIN ems.operating_mode_def d     ON d.code = m.mode_code
LEFT JOIN ems.site_heartbeat hb        ON hb.site_id = s.id
LEFT JOIN ems.vw_latest_inverter li    ON li.site_id = s.id
WHERE s.active = true;

COMMENT ON VIEW ems.vw_site_status IS
'Kompletní stavový přehled lokality: aktivní režim, heartbeat EMS, aktuální telemetrie.
Primární view pro dashboard a health check endpoint. Jeden řádek na aktivní lokalitu.
ems_heartbeat_status slouží pro EMS vlastní alerting – Loxone watchdog tuto tabulku nečte,
sleduje HTTP pulzy přímo (viz docs/loxone-integration.md).';

-- ============================================================

-- Log přepnutí režimů (pro UI historii)
CREATE OR REPLACE VIEW ems.vw_mode_log_recent AS
SELECT
    l.id,
    l.site_id,
    s.code          AS site_code,
    l.mode_code,
    d.name          AS mode_name,
    l.activated_at,
    l.deactivated_at,
    EXTRACT(EPOCH FROM COALESCE(l.deactivated_at, now()) - l.activated_at)::INT AS duration_sec,
    l.activated_by,
    l.notes
FROM ems.site_operating_mode_log l
JOIN ems.site s ON s.id = l.site_id
JOIN ems.operating_mode_def d ON d.code = l.mode_code
WHERE l.activated_at >= now() - INTERVAL '7 days'
ORDER BY l.activated_at DESC;

COMMENT ON VIEW ems.vw_mode_log_recent IS
'Posledních 7 dní přepnutí provozních režimů. Slouží pro audit log v UI.';