-- Фаза 2B: Геопространственные запросы (ВЫСОКИЙ ПРИОРИТЕТ)
-- PostGIS запросы для поиска заявок по геолокации

-- ============================================================================
-- Поиск заявок рядом с точкой
-- ============================================================================

-- name: FindRequestsNearby :many
SELECT
    r.id,
    r.title,
    r.description,
    r.address,
    r.city,
    r.urgency,
    r.status,
    r.created_at,
    r.desired_completion_date,
    ST_Y(r.location::geometry) as latitude,
    ST_X(r.location::geometry) as longitude,
    ST_Distance(
        r.location,
        ST_SetSRID(ST_MakePoint($1, $2), 4326)::geography
    ) as distance_meters,
    rt.name as request_type_name,
    rt.icon as request_type_icon,
    (u.first_name || ' ' || u.last_name) as requester_name
FROM requests r
JOIN request_types rt ON rt.id = r.request_type_id
JOIN users u ON u.id = r.requester_id
WHERE r.deleted_at IS NULL
    AND r.status::text = ANY($3::text[])
    AND ST_DWithin(
        r.location,
        ST_SetSRID(ST_MakePoint($1, $2), 4326)::geography,
        $4
    )
ORDER BY distance_meters
LIMIT $5 OFFSET $6;

-- ============================================================================
-- Поиск заявок в прямоугольной области (для карты)
-- ============================================================================

-- name: FindRequestsInBounds :many
SELECT
    r.id,
    r.title,
    r.urgency,
    r.status,
    r.created_at,
    ST_Y(r.location::geometry) as latitude,
    ST_X(r.location::geometry) as longitude,
    rt.icon as request_type_icon,
    rt.name as request_type_name
FROM requests r
JOIN request_types rt ON rt.id = r.request_type_id
WHERE r.deleted_at IS NULL
    AND r.status::text = ANY($1::text[])
    AND ST_Within(
        r.location::geometry,
        ST_MakeEnvelope($2, $3, $4, $5, 4326)
    )
ORDER BY r.created_at DESC
LIMIT 200;

-- ============================================================================
-- Подсчет заявок поблизости
-- ============================================================================

-- name: CountRequestsNearby :one
SELECT COUNT(*) FROM requests r
WHERE r.deleted_at IS NULL
    AND r.status = $3
    AND ST_DWithin(
        r.location,
        ST_SetSRID(ST_MakePoint($1, $2), 4326)::geography,
        $4
    );

-- ============================================================================
-- Поиск волонтеров рядом с заявкой
-- ============================================================================

-- name: FindVolunteersNearRequest :many
SELECT
    u.id,
    (u.first_name || ' ' || u.last_name) as full_name,
    u.avatar_url,
    u.volunteer_rating,
    u.completed_requests_count,
    ST_Y(u.location::geometry) as latitude,
    ST_X(u.location::geometry) as longitude,
    ST_Distance(
        u.location,
        (SELECT req.location FROM requests req WHERE req.id = $1)
    ) as distance_meters
FROM users u
JOIN user_roles ur ON ur.user_id = u.id
JOIN roles r ON r.id = ur.role_id
WHERE r.name = 'volunteer'
    AND u.deleted_at IS NULL
    AND u.is_blocked = FALSE
    AND u.location IS NOT NULL
    AND ST_DWithin(
        u.location,
        (SELECT req.location FROM requests req WHERE req.id = $1),
        $2
    )
ORDER BY distance_meters
LIMIT $3;

-- ============================================================================
-- Поиск ближайших заявок для волонтера
-- ============================================================================

-- name: FindNearestRequestsForVolunteer :many
SELECT
    r.id,
    r.title,
    r.description,
    r.urgency,
    r.status,
    r.created_at,
    ST_Y(r.location::geometry) as latitude,
    ST_X(r.location::geometry) as longitude,
    ST_Distance(
        r.location,
        (SELECT u.location FROM users u WHERE u.id = $1)
    ) as distance_meters,
    rt.name as request_type_name,
    rt.icon as request_type_icon
FROM requests r
JOIN request_types rt ON rt.id = r.request_type_id
WHERE r.deleted_at IS NULL
    AND r.status = 'approved'
    AND r.assigned_volunteer_id IS NULL
    AND ST_DWithin(
        r.location,
        (SELECT u.location FROM users u WHERE u.id = $1),
        $2
    )
ORDER BY
    CASE r.urgency
        WHEN 'urgent' THEN 1
        WHEN 'high' THEN 2
        WHEN 'medium' THEN 3
        ELSE 4
    END,
    distance_meters
LIMIT $3;