46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
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use std::sync::Arc;
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use uuid::Uuid;
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use crate::application::dtos::geo_dto::{GeoBounds, GeoCluster};
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use crate::common::errors::DomainError;
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use crate::infrastructure::repositories::pg::FileBlobReadRepository;
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/// "Places" use case: the caller's geotagged photos aggregated into map
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/// clusters.
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///
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/// Strictly user-scoped — the repository filters `WHERE fi.user_id = $1`, so,
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/// like [`RecentService`](super::recent_service::RecentService) and the photos
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/// timeline, it needs no `AuthorizationEngine` check: the `caller_id`
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/// parameter *is* the access scope.
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pub struct PlacesService {
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file_read: Arc<FileBlobReadRepository>,
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}
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impl PlacesService {
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pub fn new(file_read: Arc<FileBlobReadRepository>) -> Self {
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Self { file_read }
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}
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/// Aggregation cell side, in degrees, for a slippy-map zoom level. The
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/// world (360°) is split into `2^zoom` tiles; we use ~4 cells per tile so
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/// clusters refine as the user zooms in. Clamped to a sane range.
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fn cell_for_zoom(zoom: u8) -> f64 {
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let z = i32::from(zoom.min(20));
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360.0 / (2_f64.powi(z) * 4.0)
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}
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/// Clustered geotagged photos for `caller_id` within `bounds`.
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pub async fn clusters(
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&self,
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caller_id: Uuid,
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bounds: GeoBounds,
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zoom: u8,
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) -> Result<Vec<GeoCluster>, DomainError> {
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let cell = Self::cell_for_zoom(zoom);
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self.file_read
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.list_geo_clusters(caller_id, bounds, cell)
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.await
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}
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}
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