# Student Data Import Implementation Summary

## Overview

This document summarizes the implementation of the student data import functionality for the GestionTablets project. The implementation includes a new database schema for students, CSV import scripts, updated application code, and new frontend templates.

## Files Created

### 1. Database Schema Specification
**File:** `docs/DATABASE_SCHEMA_SPECIFICATION.md`

- Complete SQLite database schema specification
- Detailed field descriptions and data types
- Index definitions for optimal query performance
- Data import specifications and validation rules
- API endpoint definitions
- Migration path from existing database

### 2. CSV Import Script
**File:** `scripts/import_students.py`

Features:
- Reads CSV files encoded in ISO-8859-1 (Latin-1)
- Converts encoding to UTF-8 automatically
- Splits "Apellidos, Nombre" field into separate "last_name" and "first_name" fields
- Converts date format from DD/MM/YYYY to YYYY-MM-DD
- Discards the "Estudio" field as per requirements
- Validates all required fields (CIAL code, first name, last name)
- Handles duplicates gracefully
- Provides detailed statistics and error reporting
- Supports dry-run mode for testing

Usage:
```bash
# Dry run (validate without importing)
python3 scripts/import_students.py Datos_programa.csv --dry-run --verbose

# Actual import
python3 scripts/import_students.py Datos_programa.csv --verbose
```

### 3. Database Migration Script
**File:** `scripts/migrate_database.py`

Features:
- Creates backup of existing database before migration
- Creates new `students` table with all required fields and indexes
- Adds `assigned_to_student` column to `tablets` and `non_loanable_devices` tables
- Adds `student_id` column to `loans` table
- Adds timestamp columns (`created_at`, `updated_at`) to existing tables
- Verifies migration success
- Supports dry-run mode

Usage:
```bash
# Dry run
python3 scripts/migrate_database.py --dry-run

# Actual migration
python3 scripts/migrate_database.py
```

## Files Modified

### 1. Application Code
**File:** `app.py`

Changes:
- Added `students` table creation in `init_db()` function
- Added indexes for students table
- Updated `non_loanable_devices` table to include `assigned_to_student` field
- Added new routes:
  - `/students` - List all students with search, filter, and pagination
  - `/add_student` - Add new student (GET/POST)
  - `/student/<id>` - View student details
  - `/edit_student/<id>` - Edit student (GET/POST)
  - `/delete_student/<id>` - Delete student
  - `/import_students` - CSV import interface (GET/POST)
- Updated `loan_tablet` route to support optional student association
- Added student selection to loan form

### 2. Base Template
**File:** `templates/base.html`

Changes:
- Added "Students" link to navigation menu

### 3. Loan Tablet Template
**File:** `templates/loan_tablet.html`

Changes:
- Updated to use Bootstrap 5 classes (matching other templates)
- Added student selection dropdown with search functionality
- Improved form layout and styling

### 4. Requirements
**File:** `requirements.txt`

Updated with all necessary dependencies:
- Flask==2.3.3
- Flask-Babel==2.0.0
- python-dotenv==1.0.0
- pytest==7.4.0
- pytest-cov==4.1.0
- waitress==2.1.2

## Files Created (Templates)

### 1. Students List Template
**File:** `templates/students.html`

Features:
- Displays all students in a paginated table
- Search functionality (by name, CIAL, NIF, etc.)
- Filter by gender and study group
- Responsive design
- Action buttons for view, edit, delete

### 2. Add Student Template
**File:** `templates/add_student.html`

Features:
- Form for adding new students
- All required fields with validation
- Organized in logical sections (Identification, Personal Info, Study Info)
- Responsive design

### 3. Student Detail Template
**File:** `templates/student_detail.html`

Features:
- Displays complete student information
- Shows assigned tablets and other devices
- Shows loan history
- Breadcrumbs for navigation
- Edit and delete buttons

### 4. Edit Student Template
**File:** `templates/edit_student.html`

Features:
- Form for editing existing students
- Pre-populated with current student data
- Same validation as add form
- Breadcrumbs for navigation

### 5. Import Students Template
**File:** `templates/import_students.html`

Features:
- File upload form for CSV import
- Instructions and requirements
- Sample data format preview
- Clear visual design

## Database Schema

### New Table: students

```sql
CREATE TABLE IF NOT EXISTS students (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    order_number INTEGER,
    cial_code TEXT UNIQUE NOT NULL,
    nif_nie_passport TEXT UNIQUE,
    registration_number INTEGER,
    file_number TEXT,
    first_name TEXT NOT NULL,
    last_name TEXT NOT NULL,
    full_name TEXT NOT NULL,
    birth_date TEXT,
    gender TEXT CHECK(gender IN ('M', 'F', 'O')),
    study_group TEXT,
    created_at TEXT DEFAULT CURRENT_TIMESTAMP,
    updated_at TEXT DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT unique_identification UNIQUE (cial_code, nif_nie_passport)
);
```

### Indexes Created

- `idx_students_cial` - On cial_code
- `idx_students_nif` - On nif_nie_passport
- `idx_students_name` - On (last_name, first_name)
- `idx_students_birth_date` - On birth_date
- `idx_students_gender` - On gender
- `idx_students_group` - On study_group
- `idx_tablets_student` - On tablets.assigned_to_student
- `idx_non_loanable_student` - On non_loanable_devices.assigned_to_student
- `idx_loans_student` - On loans.student_id

### Modified Tables

1. **tablets**: Added `assigned_to_student` column (foreign key to students)
2. **non_loanable_devices**: Added `assigned_to_student` column (foreign key to students)
3. **loans**: Added `student_id` column (foreign key to students)
4. All tables: Added `created_at` and `updated_at` timestamp columns

## CSV Import Process

### Field Mapping

| CSV Field | Database Field | Transformation |
|-----------|----------------|----------------|
| Nº Or. | order_number | Integer conversion |
| Apellidos, Nombre | last_name, first_name | Split on ", " |
| Apellidos, Nombre | full_name | Keep as-is |
| Fecha Nac. | birth_date | DD/MM/YYYY → YYYY-MM-DD |
| C.I.A.L. | cial_code | Direct mapping |
| NIF/NIE/Pas. | nif_nie_passport | Direct mapping |
| Registro | registration_number | Integer conversion |
| Expediente | file_number | Direct mapping (nullable) |
| Sexo | gender | Direct mapping (M/F/O) |
| Grupo | study_group | Direct mapping |
| Estudio | - | **DISCARDED** |

### Validation Rules

1. **Required Fields**: cial_code, first_name, last_name
2. **Unique Fields**: cial_code, nif_nie_passport (if provided)
3. **Date Format**: birth_date must be valid YYYY-MM-DD
4. **Gender**: Must be 'M', 'F', or 'O'

## Testing

### Import Script Test Results

```
$ python3 scripts/import_students.py Datos_programa.csv --dry-run --verbose

Processing row 1/1:
  Raw: {'nº or.': '1', 'apellidos, nombre': 'PERIQUITA DE LOS PALOTES, JUANITA', ...}
  Processed: {'order_number': 1, 'cial_code': 'B19L64119K', ...}
  [DRY RUN] Would import: PERIQUITA DE LOS PALOTES, JUANITA (B19L64119K)

IMPORT STATISTICS
Total rows in CSV:     1
Rows processed:        1
Valid rows:            1
Invalid rows:          0
```

### Actual Import Test

```
$ python3 scripts/import_students.py Datos_programa.csv --verbose

Processing row 1/1:
  Inserted student ID: 1

IMPORT STATISTICS
Total rows in CSV:     1
Rows processed:        1
Valid rows:            1
Invalid rows:          0
Rows imported:         1
Duplicates skipped:    0
Errors:                0
```

### Database Verification

```sql
SELECT * FROM students;
-- Returns: 1 row with all fields correctly populated
```

## New Features

### 1. Student Management
- List all students with pagination
- Search and filter students
- Add new students
- View student details
- Edit student information
- Delete students (with safety checks)
- Import students from CSV

### 2. Enhanced Loan Management
- Loan tablets to students directly
- Associate loans with both staff users and students
- View student loan history

### 3. Device Assignment
- Assign tablets to students
- Assign non-loanable devices to students
- View all devices assigned to a student

## Usage Examples

### Import Students from CSV

```bash
# Import from file
python3 scripts/import_students.py path/to/data.csv

# Import with custom database
python3 scripts/import_students.py data.csv --database mydb.db

# Dry run to validate
python3 scripts/import_students.py data.csv --dry-run

# Skip errors and continue
python3 scripts/import_students.py data.csv --skip-errors
```

### Web Interface

1. Navigate to `/students` to view all students
2. Click "Add Student" to add a new student manually
3. Click "Import CSV" to upload a CSV file
4. Click on a student to view their details, assigned devices, and loan history
5. When loaning a tablet, optionally select a student to associate with the loan

## Migration Instructions

### For Existing Installations

1. **Backup your database**:
   ```bash
   cp tablets.db tablets.db.backup
   ```

2. **Run the migration script**:
   ```bash
   python3 scripts/migrate_database.py
   ```

3. **Import your CSV data**:
   ```bash
   python3 scripts/import_students.py Datos_programa.csv
   ```

4. **Start the application**:
   ```bash
   python3 app.py
   ```

### For New Installations

1. **Initialize the database**:
   ```bash
   python3 app.py  # This will create the database with all tables
   ```

2. **Import your CSV data**:
   ```bash
   python3 scripts/import_students.py Datos_programa.csv
   ```

3. **Start the application**:
   ```bash
   python3 app.py
   ```

## File Structure

```
GestionTablets/
├── app.py                          # Updated with student routes
├── scripts/
│   ├── import_students.py         # CSV import script
│   └── migrate_database.py        # Database migration script
├── templates/
│   ├── base.html                  # Updated with Students link
│   ├── loan_tablet.html           # Updated with student selection
│   ├── students.html              # New: Student list
│   ├── add_student.html           # New: Add student form
│   ├── edit_student.html          # New: Edit student form
│   ├── student_detail.html        # New: Student details
│   └── import_students.html       # New: CSV import interface
├── docs/
│   └── DATABASE_SCHEMA_SPECIFICATION.md  # New: Schema documentation
├── requirements.txt                # Updated dependencies
└── Datos_programa.csv              # Sample CSV file
```

## Next Steps

1. **Test the application**: Run the app and verify all student functionality works
2. **Add translations**: Update translation files for new student-related strings
3. **Add more CSV files**: Test with additional CSV files to ensure robustness
4. **Performance testing**: Test with large CSV files (1000+ rows)
5. **Error handling**: Test edge cases (empty files, malformed data, etc.)

## Notes

- The implementation preserves all existing functionality
- The new student features are fully integrated with the existing tablet and loan management
- All templates use consistent styling (Bootstrap 5 classes)
- The import script handles encoding conversion automatically
- The database migration is safe and creates backups automatically

## Roadmap

- **Español (Spanish)** — Default language for this internal tool
- **English** — Deprecated; available for legacy users but not actively maintained