Add transport DDL, repos and transport service

Add database DDL and server-side data access/service layers for transport domain. New SQL DDL files create transport_types, lines, stations, platforms and platform_lines tables (with FKs, indexes, spatial POINT column, CHECK constraints, and triggers to populate location). New repositories implement queries and CRUD for lines, stations, platforms and platform_lines (including distance/nearest-platform and accessibility queries). A transportService aggregates repo functions and exposes high-level operations (CRUD, station/line lookups, platform-line management and nearest-platform validation).

repositories/stationRepo.js

@@ -0,0 +1,99 @@
+const { pool } = require("../modules/database")
+const { DefaultError } = require("../errors/errors")
+
+async function findAllStations() {
+    try {
+        const sql = "SELECT * FROM stations"
+        return await pool.query(sql)
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function findStationById(stationId) {
+    try {
+        const sql = "SELECT * FROM stations WHERE id = ?"
+        const rows = await pool.query(sql, [stationId])
+        return rows[0] || null
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+// distance = celle du quai le plus proche
+async function findStationsByDistance(latitude, longitude, radiusKm) {
+    try {
+        const sql = `
+            SELECT s.*, MIN(ST_Distance_Sphere(p.location, ST_SRID(POINT(?, ?), 4326))) / 1000 AS distance
+            FROM stations s
+            JOIN platforms p ON p.stationId = s.id
+            GROUP BY s.id
+            HAVING distance <= ?
+            ORDER BY distance
+        `
+        return await pool.query(sql, [longitude, latitude, radiusKm])
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+// une station est "accessible" si AU MOINS un quai l'est
+async function findAccessibleStations(latitude, longitude, radiusKm) {
+    try {
+        const sql = `
+            SELECT s.*, MIN(ST_Distance_Sphere(p.location, ST_SRID(POINT(?, ?), 4326))) / 1000 AS distance
+            FROM stations s
+            JOIN platforms p ON p.stationId = s.id
+            WHERE p.isPRM = TRUE AND p.hasElevator = TRUE
+            GROUP BY s.id
+            HAVING distance <= ?
+            ORDER BY distance
+        `
+        return await pool.query(sql, [longitude, latitude, radiusKm])
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function createStation(name, description) {
+    try {
+        const sql = "INSERT INTO stations (name, description) VALUES (?, ?)"
+        const rows = await pool.query(sql, [name, description])
+        return rows.insertId
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function updateStation(stationId, updateData) {
+    try {
+        const fields = Object.keys(updateData)
+        const values = Object.values(updateData)
+        const setClause = fields.map(f => `${f} = ?`).join(", ")
+        const sql = `UPDATE stations SET ${setClause} WHERE id = ?`
+        const rows = await pool.query(sql, [...values, stationId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function deleteStation(stationId) {
+    try {
+        const sql = "DELETE FROM stations WHERE id = ?"
+        const rows = await pool.query(sql, [stationId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+module.exports = {
+    findAllStations,
+    findStationById,
+    findStationsByDistance,
+    findAccessibleStations,
+    createStation,
+    updateStation,
+    deleteStation
+}