refactor: modify upload section

src/components/project-selection-section.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useRef } from 'react';
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Label } from '@/components/ui/label';
@@ -17,12 +17,23 @@ import { Project, Package as PackageType, Chainage, SessionContext } from '@/typ
 import { cn } from '@/lib/utils';
 
 type ProjectSelectionSectionProps = {
-  onSelectionComplete: (session: SessionContext) => void;
+  onSelectionComplete?: (session: SessionContext) => void;
+  onSelectionChange?: (session: SessionContext | null) => void;
+  asStep?: boolean;
+  hideButton?: boolean;
 };
 
-export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectionSectionProps) {
+let globalProjectsCache: Project[] | null = null;
+let projectsPromise: Promise<Project[]> | null = null;
+
+export function ProjectSelectionSection({ 
+  onSelectionComplete, 
+  onSelectionChange,
+  asStep = false,
+  hideButton = false
+}: ProjectSelectionSectionProps) {
   // Data states
-  const [projects, setProjects] = useState<Project[]>([]);
+  const [projects, setProjects] = useState<Project[]>(globalProjectsCache || []);
   const [packages, setPackages] = useState<PackageType[]>([]);
   const [chainages, setChainages] = useState<Chainage[]>([]);
 
@@ -32,7 +43,7 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
   const [selectedChainage, setSelectedChainage] = useState<Chainage | null>(null);
 
   // Loading states
-  const [loadingProjects, setLoadingProjects] = useState(true);
+  const [loadingProjects, setLoadingProjects] = useState(!globalProjectsCache);
   const [loadingPackages, setLoadingPackages] = useState(false);
   const [loadingChainages, setLoadingChainages] = useState(false);
 
@@ -41,20 +52,48 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
 
   // Load projects on mount
   useEffect(() => {
+    let isMounted = true;
+    
     const loadProjects = async () => {
+      // Use cache if we already have it
+      if (globalProjectsCache) {
+        if (isMounted) {
+          setProjects(globalProjectsCache);
+          setLoadingProjects(false);
+        }
+        return;
+      }
+
+      // If a fetch is already in flight, reuse that promise
+      if (!projectsPromise) {
+        projectsPromise = projectService.getProjects().then(data => {
+          globalProjectsCache = data.items;
+          return data.items;
+        }).catch(err => {
+          projectsPromise = null; // Reset on error to allow retry
+          throw err;
+        });
+      }
+
       try {
         setLoadingProjects(true);
-        setError(null);
-        const data = await projectService.getProjects();
-        setProjects(data.items);
+        const data = await projectsPromise;
+        if (isMounted) {
+          setProjects(data);
+        }
       } catch (err) {
-        console.error('Failed to load projects:', err);
-        setError('Failed to load projects. Please check if the backend is running.');
+        if (isMounted) {
+          setError('Failed to load projects. Please check connection.');
+        }
       } finally {
-        setLoadingProjects(false);
+        if (isMounted) {
+          setLoadingProjects(false);
+        }
       }
     };
+
     loadProjects();
+    return () => { isMounted = false; };
   }, []);
 
   // Load packages when project changes
@@ -65,6 +104,7 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
       return;
     }
 
+    let isMounted = true;
     const loadPackages = async () => {
       try {
         setLoadingPackages(true);
@@ -73,15 +113,22 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
         setSelectedChainage(null);
         setChainages([]);
         const data = await packageService.getPackagesByProject(selectedProject.id);
-        setPackages(data.items);
+        if (isMounted) {
+          setPackages(data.items);
+        }
       } catch (err) {
-        console.error('Failed to load packages:', err);
-        setError('Failed to load packages for the selected project.');
+        if (isMounted) {
+          console.error('Failed to load packages:', err);
+          setError('Failed to load packages for the selected project.');
+        }
       } finally {
-        setLoadingPackages(false);
+        if (isMounted) {
+          setLoadingPackages(false);
+        }
       }
     };
     loadPackages();
+    return () => { isMounted = false; };
   }, [selectedProject]);
 
   // Load chainages when package changes
@@ -92,21 +139,29 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
       return;
     }
 
+    let isMounted = true;
     const loadChainages = async () => {
       try {
         setLoadingChainages(true);
         setError(null);
         setSelectedChainage(null);
         const data = await chainageService.getChainagesByPackage(selectedPackage.id);
-        setChainages(data.items);
+        if (isMounted) {
+          setChainages(data.items);
+        }
       } catch (err) {
-        console.error('Failed to load chainages:', err);
-        setError('Failed to load chainages for the selected package.');
+        if (isMounted) {
+          console.error('Failed to load chainages:', err);
+          setError('Failed to load chainages for the selected package.');
+        }
       } finally {
-        setLoadingChainages(false);
+        if (isMounted) {
+          setLoadingChainages(false);
+        }
       }
     };
     loadChainages();
+    return () => { isMounted = false; };
   }, [selectedPackage]);
 
   const handleProjectChange = (projectId: string) => {
@@ -124,8 +179,38 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
     setSelectedChainage(chainage);
   };
 
+  // Cache the last reported state to prevent infinite loops
+  const lastReportedIdRef = useRef<string | null>(null);
+
+  // Handle change reporting
+  useEffect(() => {
+    if (onSelectionChange) {
+      const currentIds = selectedProject && selectedPackage && selectedChainage 
+        ? `${selectedProject.id}-${selectedPackage.id}-${selectedChainage.id}`
+        : null;
+
+      if (currentIds !== lastReportedIdRef.current) {
+        lastReportedIdRef.current = currentIds;
+        
+        if (selectedProject && selectedPackage && selectedChainage) {
+          onSelectionChange({
+            projectId: selectedProject.id,
+            projectName: selectedProject.name,
+            packageId: selectedPackage.id,
+            packageName: selectedPackage.name,
+            chainageId: selectedChainage.id,
+            chainageName: selectedChainage.segment_name,
+            chainageDirection: selectedChainage.direction,
+          });
+        } else {
+          onSelectionChange(null);
+        }
+      }
+    }
+  }, [selectedProject, selectedPackage, selectedChainage, onSelectionChange]);
+
   const handleProceed = () => {
-    if (selectedProject && selectedPackage && selectedChainage) {
+    if (selectedProject && selectedPackage && selectedChainage && onSelectionComplete) {
       onSelectionComplete({
         projectId: selectedProject.id,
         projectName: selectedProject.name,
@@ -148,6 +233,167 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
     return 'pending';
   };
 
+  const content = (
+    <>
+      {/* Error Display */}
+      {error && (
+        <div className="p-4 rounded-md bg-destructive/10 border border-destructive/20 text-destructive text-sm mb-6">
+          {error}
+        </div>
+      )}
+
+      <div className="grid grid-cols-1 md:grid-cols-3 gap-6 mb-8">
+        {/* Project Dropdown */}
+        <div className="space-y-2">
+          <Label htmlFor="project" className="text-sm font-semibold">
+            Project
+          </Label>
+          <Select
+            value={selectedProject?.id || ''}
+            onValueChange={handleProjectChange}
+            disabled={loadingProjects}
+          >
+            <SelectTrigger id="project" className="h-11">
+              {loadingProjects ? (
+                <div className="flex items-center gap-2">
+                  <Loader2 className="h-4 w-4 animate-spin" />
+                  <span>Loading...</span>
+                </div>
+              ) : (
+                <SelectValue placeholder="Select project" />
+              )}
+            </SelectTrigger>
+            <SelectContent>
+              {projects.map((project) => (
+                <SelectItem key={project.id} value={project.id}>
+                  {project.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+
+        {/* Package Dropdown */}
+        <div className="space-y-2">
+          <Label htmlFor="package" className="text-sm font-semibold">
+            Package
+          </Label>
+          <Select
+            value={selectedPackage?.id || ''}
+            onValueChange={handlePackageChange}
+            disabled={!selectedProject || loadingPackages}
+          >
+            <SelectTrigger id="package" className="h-11">
+              {loadingPackages ? (
+                <div className="flex items-center gap-2">
+                  <Loader2 className="h-4 w-4 animate-spin" />
+                  <span>Loading...</span>
+                </div>
+              ) : (
+                <SelectValue
+                  placeholder={selectedProject ? 'Select package' : 'Select project first'}
+                />
+              )}
+            </SelectTrigger>
+            <SelectContent>
+              {packages.map((pkg) => (
+                <SelectItem key={pkg.id} value={pkg.id}>
+                  {pkg.name}
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+
+        {/* Chainage Dropdown */}
+        <div className="space-y-2">
+          <Label htmlFor="chainage" className="text-sm font-semibold">
+            Chainage
+          </Label>
+          <Select
+            value={selectedChainage?.id || ''}
+            onValueChange={handleChainageChange}
+            disabled={!selectedPackage || loadingChainages}
+          >
+            <SelectTrigger id="chainage" className="h-11">
+              {loadingChainages ? (
+                <div className="flex items-center gap-2">
+                  <Loader2 className="h-4 w-4 animate-spin" />
+                  <span>Loading...</span>
+                </div>
+              ) : (
+                <SelectValue
+                  placeholder={selectedPackage ? 'Select chainage' : 'Select package first'}
+                />
+              )}
+            </SelectTrigger>
+            <SelectContent>
+              {chainages.map((chn) => (
+                <SelectItem key={chn.id} value={chn.id}>
+                  <div className="flex flex-col gap-0.5 py-0.5">
+                    <span className="font-semibold text-sm">{chn.segment_name}</span>
+                    <div className="flex items-center gap-2 text-[10px] text-muted-foreground font-medium">
+                      <span>{chn.chainage_start_km}-{chn.chainage_end_km} km</span>
+                      <span className="h-2.5 w-px bg-border" />
+                      <span className="flex items-center gap-1 uppercase">
+                        {chn.direction === 'UP' ? (
+                          <ArrowUp className="h-2.5 w-2.5" />
+                        ) : (
+                          <ArrowDown className="h-2.5 w-2.5" />
+                        )}
+                        {chn.direction}
+                      </span>
+                    </div>
+                  </div>
+                </SelectItem>
+              ))}
+            </SelectContent>
+          </Select>
+        </div>
+      </div>
+
+      {/* Selected Summary - Only if not asStep or if specifically desired */}
+      {!asStep && isComplete && (
+        <div className="px-4 py-3 rounded-md bg-secondary/50 border text-sm mb-8">
+          <div className="flex items-center gap-2 flex-wrap text-muted-foreground">
+            <span className="font-semibold text-foreground">Selection:</span>
+            <span className="text-foreground">{selectedProject?.name}</span>
+            <span>/</span>
+            <span className="text-foreground">{selectedPackage?.name}</span>
+            <span>/</span>
+            <span className="text-foreground flex items-center gap-1.5">
+              {selectedChainage?.segment_name}
+              <span className="inline-flex items-center gap-1 px-1.5 py-0.5 rounded bg-muted text-[10px] font-bold uppercase border">
+                {selectedChainage?.direction === 'UP' ? (
+                  <ArrowUp className="h-2.5 w-2.5" />
+                ) : (
+                  <ArrowDown className="h-2.5 w-2.5" />
+                )}
+                {selectedChainage?.direction}
+              </span>
+            </span>
+          </div>
+        </div>
+      )}
+
+      {/* Proceed Button */}
+      {!hideButton && (
+        <Button
+          onClick={handleProceed}
+          disabled={!isComplete}
+          className="w-full h-14 text-base font-bold uppercase tracking-wider"
+          size="lg"
+        >
+          {isComplete ? 'Proceed to Upload' : 'Select all fields to proceed'}
+        </Button>
+      )}
+    </>
+  );
+
+  if (asStep) {
+    return content;
+  }
+
   return (
     <Card className="overflow-hidden">
       <CardHeader className="pb-6">
@@ -203,157 +449,8 @@ export function ProjectSelectionSection({ onSelectionComplete }: ProjectSelectio
         </div>
       </CardHeader>
 
-      <CardContent className="space-y-8">
-        {/* Error Display */}
-        {error && (
-          <div className="p-4 rounded-md bg-destructive/10 border border-destructive/20 text-destructive text-sm">
-            {error}
-          </div>
-        )}
-
-        <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
-          {/* Project Dropdown */}
-          <div className="space-y-2">
-            <Label htmlFor="project" className="text-sm font-semibold">
-              Project
-            </Label>
-            <Select
-              value={selectedProject?.id || ''}
-              onValueChange={handleProjectChange}
-              disabled={loadingProjects}
-            >
-              <SelectTrigger id="project" className="h-11">
-                {loadingProjects ? (
-                  <div className="flex items-center gap-2">
-                    <Loader2 className="h-4 w-4 animate-spin" />
-                    <span>Loading...</span>
-                  </div>
-                ) : (
-                  <SelectValue placeholder="Select project" />
-                )}
-              </SelectTrigger>
-              <SelectContent>
-                {projects.map((project) => (
-                  <SelectItem key={project.id} value={project.id}>
-                    {project.name}
-                  </SelectItem>
-                ))}
-              </SelectContent>
-            </Select>
-          </div>
-
-          {/* Package Dropdown */}
-          <div className="space-y-2">
-            <Label htmlFor="package" className="text-sm font-semibold">
-              Package
-            </Label>
-            <Select
-              value={selectedPackage?.id || ''}
-              onValueChange={handlePackageChange}
-              disabled={!selectedProject || loadingPackages}
-            >
-              <SelectTrigger id="package" className="h-11">
-                {loadingPackages ? (
-                  <div className="flex items-center gap-2">
-                    <Loader2 className="h-4 w-4 animate-spin" />
-                    <span>Loading...</span>
-                  </div>
-                ) : (
-                  <SelectValue
-                    placeholder={selectedProject ? 'Select package' : 'Select project first'}
-                  />
-                )}
-              </SelectTrigger>
-              <SelectContent>
-                {packages.map((pkg) => (
-                  <SelectItem key={pkg.id} value={pkg.id}>
-                    {pkg.name}
-                  </SelectItem>
-                ))}
-              </SelectContent>
-            </Select>
-          </div>
-
-          {/* Chainage Dropdown */}
-          <div className="space-y-2">
-            <Label htmlFor="chainage" className="text-sm font-semibold">
-              Chainage
-            </Label>
-            <Select
-              value={selectedChainage?.id || ''}
-              onValueChange={handleChainageChange}
-              disabled={!selectedPackage || loadingChainages}
-            >
-              <SelectTrigger id="chainage" className="h-11">
-                {loadingChainages ? (
-                  <div className="flex items-center gap-2">
-                    <Loader2 className="h-4 w-4 animate-spin" />
-                    <span>Loading...</span>
-                  </div>
-                ) : (
-                  <SelectValue
-                    placeholder={selectedPackage ? 'Select chainage' : 'Select package first'}
-                  />
-                )}
-              </SelectTrigger>
-              <SelectContent>
-                {chainages.map((chn) => (
-                  <SelectItem key={chn.id} value={chn.id}>
-                    <div className="flex flex-col gap-0.5 py-0.5">
-                      <span className="font-semibold text-sm">{chn.segment_name}</span>
-                      <div className="flex items-center gap-2 text-[10px] text-muted-foreground font-medium">
-                        <span>{chn.chainage_start_km}-{chn.chainage_end_km} km</span>
-                        <span className="h-2.5 w-px bg-border" />
-                        <span className="flex items-center gap-1 uppercase">
-                          {chn.direction === 'UP' ? (
-                            <ArrowUp className="h-2.5 w-2.5" />
-                          ) : (
-                            <ArrowDown className="h-2.5 w-2.5" />
-                          )}
-                          {chn.direction}
-                        </span>
-                      </div>
-                    </div>
-                  </SelectItem>
-                ))}
-              </SelectContent>
-            </Select>
-          </div>
-        </div>
-
-        {/* Selected Summary */}
-        {isComplete && (
-          <div className="px-4 py-3 rounded-md bg-secondary/50 border text-sm">
-            <div className="flex items-center gap-2 flex-wrap text-muted-foreground">
-              <span className="font-semibold text-foreground">Selection:</span>
-              <span className="text-foreground">{selectedProject?.name}</span>
-              <span>/</span>
-              <span className="text-foreground">{selectedPackage?.name}</span>
-              <span>/</span>
-              <span className="text-foreground flex items-center gap-1.5">
-                {selectedChainage?.segment_name}
-                <span className="inline-flex items-center gap-1 px-1.5 py-0.5 rounded bg-muted text-[10px] font-bold uppercase border">
-                  {selectedChainage?.direction === 'UP' ? (
-                    <ArrowUp className="h-2.5 w-2.5" />
-                  ) : (
-                    <ArrowDown className="h-2.5 w-2.5" />
-                  )}
-                  {selectedChainage?.direction}
-                </span>
-              </span>
-            </div>
-          </div>
-        )}
-
-        {/* Proceed Button */}
-        <Button
-          onClick={handleProceed}
-          disabled={!isComplete}
-          className="w-full h-12 text-base font-bold uppercase tracking-wide"
-          size="lg"
-        >
-          {isComplete ? 'Proceed to Upload' : 'Select all fields to proceed'}
-        </Button>
+      <CardContent className="pt-0">
+        {content}
       </CardContent>
     </Card>
   );