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app/Models/ApprovalStep.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ApprovalStep extends Model
+{
+    /** @use HasFactory<\Database\Factories\ApprovalStepFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'workflow_id',
+        'order',
+        'name',
+        'role',
+    ];
+
+    public function workflow(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalWorkflow::class, 'workflow_id');
+    }
+
+    public function approvals(): HasMany
+    {
+        return $this->hasMany(TravelRequestApproval::class);
+    }
+}

app/Models/ApprovalWorkflow.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class ApprovalWorkflow extends Model
+{
+    /** @use HasFactory<\Database\Factories\ApprovalWorkflowFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'description',
+        'is_active',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+        ];
+    }
+
+    public function steps(): HasMany
+    {
+        return $this->hasMany(ApprovalStep::class, 'workflow_id')->orderBy('order');
+    }
+
+    public function travelRequests(): HasMany
+    {
+        return $this->hasMany(TravelRequest::class, 'workflow_id');
+    }
+}

app/Models/EmergencyContact.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class EmergencyContact extends Model
+{
+    /** @use HasFactory<\Database\Factories\EmergencyContactFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'full_name',
+        'phone_number',
+        'relationship',
+    ];
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+}

app/Models/TravelCostCode.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TravelCostCode extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelCostCodeFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'travel_request_id',
+        'business_unit',
+        'project_grant',
+        'account_code',
+        'class_code',
+    ];
+
+    public function travelRequest(): BelongsTo
+    {
+        return $this->belongsTo(TravelRequest::class);
+    }
+}

app/Models/TravelJourney.php

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+<?php
+
+namespace App\Models;
+
+use App\Enums\JourneyMethod;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TravelJourney extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelJourneyFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'travel_request_id',
+        'origin',
+        'destination',
+        'date',
+        'time',
+        'method',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'method' => JourneyMethod::class,
+            'date' => 'date',
+        ];
+    }
+
+    public function travelRequest(): BelongsTo
+    {
+        return $this->belongsTo(TravelRequest::class);
+    }
+}

app/Models/TravelRequest.php

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+<?php
+
+namespace App\Models;
+
+use App\Enums\EventType;
+use App\Enums\GeneralType;
+use App\Enums\TravelStatus;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class TravelRequest extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelRequestFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'user_id',
+        'workflow_id',
+        'status',
+        'reason_summary',
+        'event_type',
+        'general_type',
+        'needs_accommodation',
+        'needs_car_hire',
+        'vehicle_policy_acknowledged',
+        'business_days',
+        'private_days',
+        'additional_notes',
+        'submitted_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => TravelStatus::class,
+            'event_type' => EventType::class,
+            'general_type' => GeneralType::class,
+            'needs_accommodation' => 'boolean',
+            'needs_car_hire' => 'boolean',
+            'vehicle_policy_acknowledged' => 'boolean',
+            'submitted_at' => 'datetime',
+        ];
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function workflow(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalWorkflow::class, 'workflow_id');
+    }
+
+    public function journeys(): HasMany
+    {
+        return $this->hasMany(TravelJourney::class);
+    }
+
+    public function costCodes(): HasMany
+    {
+        return $this->hasMany(TravelCostCode::class);
+    }
+
+    public function approvals(): HasMany
+    {
+        return $this->hasMany(TravelRequestApproval::class);
+    }
+}

app/Models/TravelRequestApproval.php

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+<?php
+
+namespace App\Models;
+
+use App\Enums\ApprovalStatus;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class TravelRequestApproval extends Model
+{
+    /** @use HasFactory<\Database\Factories\TravelRequestApprovalFactory> */
+    use HasFactory;
+
+    protected $fillable = [
+        'travel_request_id',
+        'approval_step_id',
+        'approver_id',
+        'status',
+        'comments',
+        'acted_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'status' => ApprovalStatus::class,
+            'acted_at' => 'datetime',
+        ];
+    }
+
+    public function travelRequest(): BelongsTo
+    {
+        return $this->belongsTo(TravelRequest::class);
+    }
+
+    public function step(): BelongsTo
+    {
+        return $this->belongsTo(ApprovalStep::class, 'approval_step_id');
+    }
+
+    public function approver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'approver_id');
+    }
+}

app/Models/User.php

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+<?php
+
+namespace App\Models;
+
+use Filament\Models\Contracts\FilamentUser;
+use Filament\Panel;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+use Illuminate\Support\Str;
+use LdapRecord\Laravel\Auth\AuthenticatesWithLdap;
+use LdapRecord\Laravel\Auth\HasLdapUser;
+use LdapRecord\Laravel\Auth\LdapAuthenticatable;
+use Spatie\Permission\Traits\HasRoles;
+
+class User extends Authenticatable implements FilamentUser, LdapAuthenticatable
+{
+    /** @use HasFactory<\Database\Factories\UserFactory> */
+    use HasFactory, Notifiable, HasRoles, AuthenticatesWithLdap, HasLdapUser;
+
+    /**
+     * @var list<string>
+     */
+    protected $fillable = [
+        'name',
+        'email',
+        'password',
+        'username',
+        'phone',
+        'department',
+        'title',
+        'ldap_guid',
+        'ldap_domain',
+    ];
+
+    /**
+     * @var list<string>
+     */
+    protected $hidden = [
+        'password',
+        'remember_token',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'email_verified_at' => 'datetime',
+            'password' => 'hashed',
+        ];
+    }
+
+    public function initials(): string
+    {
+        return Str::of($this->name)
+            ->explode(' ')
+            ->take(2)
+            ->map(fn ($word) => Str::substr($word, 0, 1))
+            ->implode('');
+    }
+
+    public function canAccessPanel(Panel $panel): bool
+    {
+        return $this->hasRole('administrator');
+    }
+
+    public function emergencyContacts(): HasMany
+    {
+        return $this->hasMany(EmergencyContact::class);
+    }
+
+    public function travelRequests(): HasMany
+    {
+        return $this->hasMany(TravelRequest::class);
+    }
+}