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/platformRepo.js

@@ -0,0 +1,85 @@
+const { pool } = require("../modules/database")
+const { DefaultError } = require("../errors/errors")
+
+async function findPlatformsByStation(stationId) {
+    try {
+        const sql = "SELECT * FROM platforms WHERE stationId = ?"
+        return await pool.query(sql, [stationId])
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function findPlatformById(platformId) {
+    try {
+        const sql = "SELECT * FROM platforms WHERE id = ?"
+        const rows = await pool.query(sql, [platformId])
+        return rows[0] || null
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+// cœur de la validation : quai le plus proche desservant CETTE ligne
+async function findNearestPlatformForLine(lineId, latitude, longitude, radiusM) {
+    try {
+        const sql = `
+            SELECT p.*, ST_Distance_Sphere(p.location, ST_SRID(POINT(?, ?), 4326)) AS distance
+            FROM platforms p
+            JOIN platform_lines pl ON pl.platformId = p.id
+            WHERE pl.lineId = ?
+            HAVING distance <= ?
+            ORDER BY distance
+            LIMIT 1
+        `
+        const rows = await pool.query(sql, [longitude, latitude, lineId, radiusM])
+        return rows[0] || null
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function createPlatform(stationId, name, direction, latitude, longitude, isPRM, hasElevator) {
+    try {
+        const sql = `
+            INSERT INTO platforms (stationId, name, direction, latitude, longitude, isPRM, hasElevator)
+            VALUES (?, ?, ?, ?, ?, ?, ?)
+        `
+        const rows = await pool.query(sql, [
+            stationId, name, direction, latitude, longitude,
+            longitude, latitude, isPRM, hasElevator
+        ])
+        return rows.insertId
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function updatePlatformAccessibility(platformId, isPRM, hasElevator) {
+    try {
+        const sql = "UPDATE platforms SET isPRM = ?, hasElevator = ? WHERE id = ?"
+        const rows = await pool.query(sql, [isPRM, hasElevator, platformId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+async function deletePlatform(platformId) {
+    try {
+        const sql = "DELETE FROM platforms WHERE id = ?"
+        const rows = await pool.query(sql, [platformId])
+        return rows.affectedRows > 0
+    } catch (error) {
+        throw new DefaultError(500, "Internal Server Error", error)
+    }
+}
+
+module.exports = {
+    findPlatformsByStation,
+    findPlatformById,
+    findNearestPlatformForLine,
+    createPlatform,
+    updatePlatformAccessibility,
+    deletePlatform
+}