# Department & Complaint Hierarchy Migration - Full Technical Handoff

## Overview

PX360 is a hospital patient experience management system (Django + SQLite). We are migrating from a **3-level legacy hierarchy** (Location → MainSection → SubSection) to a **new hierarchy** (Department → Section → Sub-Section) with proper org structure, role-based contact persons, and department-centric complaint routing.

The legacy models are **not deleted** — they are renamed with `Legacy*` prefix and `db_table` preserved. The new `Department` model has 7 role-holder FKs (all FK to `Staff`), and complaints/inquiries/observations can be routed to departments with mandatory champion or manager validation.

---

## Current State

| Metric | Value |
|---|---|
| Total complaints | 2,160 |
| Complaints with `department_id` set | 2,151 (99.6%) |
| Complaints with `legacy_subsection_id` | 2,150 |
| Complaints without any department | 9 |
| Total departments (new) | 66 |
| Total sections (OrgSubSection) | 152 |
| Total sub-sections (OrgSubSubSection) | 17 |
| LegacyHierarchyMapping rows | 88 |

---

## Database Schema

### New Models (created via migrations 0001-0006)

#### `organizations_department` (UUID PK, 30 columns)
```python
class Department(models.Model):
    # Location fields
    hospital        = FK(Hospital, CASCADE, related_name="departments")
    area            = CharField(100)          # High-level area
    main_section    = CharField(200)          # Main section name
    name            = CharField(200)
    name_en         = CharField(200, blank=True)
    name_ar         = CharField(200, blank=True)
    code            = CharField(100, db_index=True)
    category        = CharField(30, choices=DepartmentCategory, db_index=True)
    parent          = FK(self, SET_NULL, null=True)
    location_type   = CharField(20)           # OP, IP, ER, GENERAL
    sub_location    = CharField(200)
    floor           = CharField(50)

    # Role holders (all FK to Staff)
    manager         = FK(accounts.User, SET_NULL, null=True)
    champion        = FK(Staff, SET_NULL, null=True, related_name="champion_departments")
    manager_1st     = FK(Staff, SET_NULL, null=True, related_name="dept_manager_1st")
    manager_2nd     = FK(Staff, SET_NULL, null=True, related_name="dept_manager_2nd")
    manager_3rd     = FK(Staff, SET_NULL, null=True, related_name="dept_manager_3rd")
    deputy_manager  = FK(Staff, SET_NULL, null=True, related_name="dept_deputy_manager")
    supervisor      = FK(Staff, SET_NULL, null=True, related_name="dept_supervisor")
    deputy_supervisor = FK(Staff, SET_NULL, null=True, related_name="dept_deputy_supervisor")

    # Contact / legacy
    champion_email  = EmailField(200, blank=True)
    old_name_en     = CharField(200, blank=True)  # Legacy English name from Excel
    old_name_ar     = CharField(200, blank=True)  # Legacy Arabic name from Excel
    phone           = CharField(20, blank=True)
    email           = EmailField(blank=True)
    location        = CharField(200, blank=True)   # Free text (NOT a FK)
    status          = CharField(20, default="active")

    ROLE_FIELDS = [
        ("champion", "Champion"),
        ("manager_1st", "1st Manager"),
        ("manager_2nd", "2nd Manager"),
        ("manager_3rd", "3rd Manager"),
        ("deputy_manager", "Deputy Manager"),
        ("supervisor", "Supervisor"),
        ("deputy_supervisor", "Deputy Supervisor"),
    ]

    def get_role_holders(self):
        """Returns list of dicts: {staff, staff_id, name, email, role_field, role_label}"""

    def is_valid_contact_person(self, staff_id):
        """Validates a staff_id against all 7 role FKs. Returns holder dict or None."""
```

#### `organizations_orgsubsection` (UUID PK, 152 rows)
```python
class OrgSubSection(models.Model):
    department      = FK(Department, CASCADE, related_name="org_subsections")
    name_en         = CharField(200)
    name_ar         = CharField(200, blank=True)
    code            = CharField(100, blank=True)
    location_type   = CharField(20)
    sub_location    = CharField(200)
    floor           = CharField(50)
    point_of_contact = FK(Staff, SET_NULL, null=True)
    old_name_en     = CharField(200, blank=True)
    old_name_ar     = CharField(200, blank=True)
    status          = CharField(20, default="active")

    class Meta:
        unique_together = [("department", "code")]
```

#### `organizations_orgsubsubsection` (UUID PK, 17 rows)
```python
class OrgSubSubSection(models.Model):
    subsection      = FK(OrgSubSection, CASCADE, related_name="sub_subsections")
    name_en         = CharField(200)
    name_ar         = CharField(200, blank=True)
    code            = CharField(100, blank=True)
    status          = CharField(20, default="active")

    class Meta:
        unique_together = [("subsection", "code")]
```

#### `organizations_legacyhierarchymapping` (UUID PK, 88 rows)
```python
class LegacyHierarchyMapping(models.Model):
    old_location_ar      = CharField(200, db_index=True)
    old_main_section_ar  = CharField(200, db_index=True)
    old_subsection_ar    = CharField(200, db_index=True)
    old_location_en      = CharField(200, blank=True)
    old_main_section_en  = CharField(200, blank=True)
    old_subsection_en    = CharField(200, blank=True)
    main_section         = FK(Department, SET_NULL, null=True)       # Maps to Department
    subsection           = FK(OrgSubSection, SET_NULL, null=True)
    sub_subsection       = FK(OrgSubSubSection, SET_NULL, null=True)

    class Meta:
        unique_together = [("old_location_ar", "old_main_section_ar", "old_subsection_ar")]
```

### Legacy Models (renamed, db_table preserved, backward-compat aliases)

```python
class LegacyLocation(models.Model):       # db_table = "organizations_location"
    id = models.IntegerField(primary_key=True)
    name_ar, name_en
    ACTIVE_IDS = [48, 49, 82, 110]

class LegacyMainSection(models.Model):    # db_table = "organizations_mainsection"
    id = models.IntegerField(primary_key=True)
    name_ar, name_en

class LegacySubSection(models.Model):     # db_table = "organizations_subsection"
    internal_id = models.IntegerField(primary_key=True)
    name_ar, name_en
    location = FK(LegacyLocation)
    main_section = FK(LegacyMainSection)
```

### Complaint Model Hierarchy Fields

```python
class Complaint(models.Model):
    # NEW hierarchy
    department      = FK(Department, SET_NULL, null=True, related_name="complaints")
    section         = FK(OrgSubSection, PROTECT, null=True, related_name="complaints")
    sub_subsection  = FK(OrgSubSubSection, PROTECT, null=True, related_name="complaints")

    # LEGACY FKs (kept for backward compatibility)
    legacy_location      = FK(LegacyLocation, PROTECT, null=True, related_name="complaints")
    legacy_main_section  = FK(LegacyMainSection, PROTECT, null=True, related_name="complaints")
    legacy_subsection    = FK(LegacySubSection, PROTECT, null=True, related_name="complaints")

    # Raw text (for mapping/audit)
    old_location_raw     = CharField(200, blank=True, db_index=True)
    old_main_section_raw = CharField(200, blank=True, db_index=True)
    old_subsection_raw   = CharField(200, blank=True, db_index=True)
```

Inquiry and Observation models have the same pattern of new + legacy + raw fields.

---

## URL Structure

### New hierarchy dropdown APIs (in `apps/organizations/urls.py`)
```
/dropdowns/departments-by-category/?category=<cat>  → api_departments_by_category
/dropdowns/sections/<uuid:department_id>/            → api_sections_by_department
/dropdowns/sub-subsections/<uuid:section_id>/        → api_sub_subsections_by_section
```

### Role management
```
/department-contacts/<uuid:dept_id>/  → api_department_contacts  (GET, returns role holders JSON)
/set-role/                             → set_department_role      (POST, sets/clears a role on dept)
```

### Complaint send/escalate (AJAX endpoints)
```
/complaints/<uuid:pk>/send-to/      → complaint_send_to      (POST)
/complaints/<uuid:pk>/escalate/     → complaint_escalate     (POST)
/complaints/<uuid:pk>/send-to-department/ → complaint_send_to (POST, same endpoint)
/inquiries/<uuid:pk>/escalate/      → inquiry_escalate       (POST)
/inquiries/<uuid:pk>/send-to/       → inquiry_send_to        (POST)
/observations/<uuid:pk>/escalate/   → observation_escalate   (POST)
/observations/<uuid:pk>/send-to/    → observation_send_to    (POST)
```

### Legacy dropdown APIs (still active, used by internal forms)
```
/dropdowns/locations/                     → api_locations
/ajax/main-sections/?location=<id>       → ajax_main_sections
/ajax/subsections/?location=<id>&main_section=<id> → ajax_subsections
```

---

## Key Code Files

### Models
| File | Content |
|---|---|
| `apps/organizations/models.py:151-279` | Department model (30 fields, ROLE_FIELDS, get_role_holders, is_valid_contact_person) |
| `apps/organizations/models.py:697-726` | OrgSubSection model |
| `apps/organizations/models.py:729-747` | OrgSubSubSection model |
| `apps/organizations/models.py:750-779` | LegacyHierarchyMapping model |
| `apps/organizations/models.py:651-694` | LegacyLocation, LegacyMainSection, LegacySubSection |
| `apps/complaints/models.py:260-378` | Complaint model (department, section, sub_subsection, legacy_*_id, old_*_raw) |

### Views (UI + API)
| File | Lines | Content |
|---|---|---|
| `apps/organizations/ui_views.py:1876-2187` | `department_detail` — tabbed view with roles, complaints, inquiries, etc. |
| `apps/organizations/ui_views.py:3503-3545` | `set_department_role` — POST to set/clear one of 7 role FKs |
| `apps/organizations/views.py:838-869` | 4 new dropdown/contacts API endpoints |
| `apps/complaints/ui_views.py:294-413` | `complaint_list` — filters by `department_id` (line 398) |
| `apps/complaints/ui_views.py:954-1140` | `complaint_send_to` — validates champion/manager, contact person |
| `apps/complaints/ui_views.py:1584-1682` | `complaint_escalate` — manual escalation to specific staff |
| `apps/complaints/ui_views.py:3128-3195` | `inquiry_escalate` |
| `apps/complaints/ui_views.py:3200-3348` | `inquiry_send_to` |
| `apps/complaints/ui_views.py:6243-6296` | `government_ticket_list` — filters by `legacy_main_section_id` |
| `apps/complaints/ui_views.py:6300-6315` | `government_ticket_detail` |
| `apps/complaints/ui_views.py:6628-6659` | `government_ticket_export` |
| `apps/observations/views.py:1160-1236` | `observation_escalate` |
| `apps/observations/views.py:1241-1401` | `observation_send_to` |
| `apps/observations/views.py:1032-1155` | `observation_send_to_department` |

### Services
| File | Content |
|---|---|
| `apps/complaints/services/complaint_service.py` | `ComplaintService.send_to_department` |
| `apps/complaints/tasks.py:672-679` | `escalate_complaint_auto` — DISABLED (no-op, returns immediately) |
| `apps/complaints/tasks.py:682-867` | `_escalate_complaint_auto_original` — preserved but not dispatched |
| `apps/complaints/tasks.py:870-958` | `escalate_after_reminder` — effectively disabled |
| `apps/complaints/tasks.py:358-390` | `check_overdue_complaints` — still runs, calls disabled auto-escalate |
| `apps/observations/services.py` | `ObservationService.create_observation` — accepts section, sub_subsection |

### Forms (using legacy hierarchy — NOT yet migrated)
| File | Form Class | Fields | Lines |
|---|---|---|---|
| `apps/complaints/forms.py:58` | `PublicComplaintForm` | location, main_section, subsection (required=True) | 58-378 |
| `apps/complaints/forms.py:379` | `ComplaintForm` | location, main_section, subsection | 379-611 |
| `apps/complaints/forms.py:612` | `InquiryForm` | location, main_section, subsection (required=False) | 612-1220 |
| `apps/complaints/forms.py:1221` | `GovernmentTicketForm` | legacy_location, legacy_main_section, legacy_subsection | 1221-end |

All 4 forms use `LegacyLocation.active_locations()`, `LegacyMainSection`, `LegacySubSection` with server-side cascading in `__init__`.

### Templates — Migrated to New Hierarchy
| Template | What Changed |
|---|---|
| `templates/complaints/public_complaint_form.html` | Category → Department → Section → Sub-Section cascade (JS via new APIs) |
| `templates/core/public_submit.html` | 4 forms: complaint, observation, inquiry, appreciation — all switched to new hierarchy |
| `templates/components/send_to_modal.html` | Shared modal with contact person dropdown (calls `api_department_contacts`) |
| `templates/organizations/department_detail.html` | Roles tab with `#roleModal`, all 7 role fields |

### Templates — Still Using Old Hierarchy
| Template | Fields Displayed |
|---|---|
| `templates/complaints/complaint_form.html` | location, main_section, subsection (via ajax_* endpoints) |
| `templates/complaints/inquiry_form.html` | location, main_section, subsection |
| `templates/complaints/government_ticket_form.html` | location, main_section, subsection |
| `templates/complaints/government_ticket_list.html:166` | `ticket.legacy_main_section.name_en` |
| `templates/complaints/government_ticket_detail.html:128-136` | legacy_location, legacy_main_section, legacy_subsection |
| `templates/complaints/complaint_detail.html` | Displays legacy_* fields |
| `templates/complaints/complaint_pdf.html` | Displays legacy_* fields |

### Dashboard/Analytics Services — Still Using Old Hierarchy
| File | Lines | Issue |
|---|---|---|
| `apps/dashboard/services/complaint_monthly_service.py:54` | `select_related(..., "location", "main_section", ...)` | Uses `location` FK |
| `apps/dashboard/services/complaint_quarterly_service.py:238-255` | `_compute_location_breakdown()` | IP/OP/ER based on `location__name_en` string matching |
| `apps/dashboard/services/complaint_quarterly_service.py:593-626` | `get_chart_data()` | `c.location.name_en` |
| `apps/dashboard/services/complaint_monthly_export.py:204` | Export row | `c.location.name` |
| `apps/analytics/services/kpi_service.py:948-978` | `_create_location_breakdowns()` | Queries both `location` and `main_section` FKs |
| `apps/analytics/services/kpi_service.py:1540` | AI analysis | `select_related(..., "location", "main_section", ...)` |
| `apps/analytics/services/kpi_service.py:1621-1624` | Location counts | `c.location.name_en` |

### Management Commands
| File | Content |
|---|---|
| `apps/organizations/management/commands/import_departments_excel.py` (286 lines) | Excel import: matches by `hospital+name_en`, creates Dept/OrgSubSection/OrgSubSubSection/LegacyHierarchyMapping. Dry-run support. |
| `apps/organizations/management/commands/backfill_department_hierarchy.py` (284 lines) | 5-level cascade matching: manual override → LegacyHierarchyMapping → exact name → normalized → contains. 136-entry MANUAL_MAP dict. |

---

## What's Been Completed

1. **Schema reconciliation**: DB tables/columns created via raw SQL (all old Django migration records deleted, all new migration files faked-applied). 3 new tables, 100+ new columns.

2. **Legacy FK backfill on complaints**: `legacy_location_id`, `legacy_main_section_id`, `legacy_subsection_id` populated from old `location_id`, `main_section_id`, `subsection_id` for all 2,160 complaints. Raw text values (`old_*_raw`) also populated.

3. **Excel import**: 66 departments, 152 sections, 17 sub-sections, 88 legacy hierarchy mappings created.

4. **Backfill command**: 2,151/2,160 complaints now have `department_id` set (99.6%).

5. **Patient-facing complaint form**: Switched from Location→MainSection→SubSection to Category→Department→Section→SubSection.

6. **Public submit forms (4 forms)**: All switched to new hierarchy cascade.

7. **Observation service**: Updated to accept section/sub_subsection params.

8. **Send-to-department**: Validates champion or manager_1st exists, validates contact person against 7 role FKs.

9. **Contact person selection**: When sending to department, user picks from role holders. Champion pre-selected if available.

10. **Department detail**: Roles tab with single reusable modal for all 7 roles.

11. **Manual escalation**: Implemented for complaint, inquiry, and observation. Auto-escalation disabled (code preserved).

12. **Dropdown APIs**: 3 new endpoints for department→section→subsection cascade, contacts API.

---

## What Remains (Not Yet Migrated)

### Critical
1. **Government ticket list view** (`ui_views.py:6265`): Filters by `legacy_main_section_id`. Should filter by `department`.
2. **Dashboard quarterly IP/OP/ER** (`complaint_quarterly_service.py:238-255`): Uses `location__name_en` string matching. Should derive from `department.location_type`.
3. **Dashboard monthly export** (`complaint_monthly_export.py:204`): Uses `c.location.name`. Should use department.
4. **KPI service** (`kpi_service.py:948-978`): Queries both `location` and `main_section` FKs.

### Medium
5. **Internal staff forms**: `complaint_form.html`, `inquiry_form.html`, `government_ticket_form.html` — still use old Location→MainSection→SubSection cascade with `ajax_main_sections`/`ajax_subsections` endpoints.
6. **31 departments without category**: Need category values assigned from the Excel data.

### Low
7. **Detail templates**: `complaint_detail.html`, `complaint_pdf.html`, `inquiry_detail.html`, `government_ticket_detail.html` — still display `legacy_*` fields.
8. **Stop writing legacy FKs**: New complaints could stop writing `legacy_*` FKs (or auto-populate from `department`).

---

## Key Design Decisions

- **Contact person = one of 7 department role holders** (champion, manager_1st-3rd, deputy_manager, supervisor, deputy_supervisor). Champion pre-selected if available.
- **Department cannot receive complaint without champion OR manager_1st**.
- **Auto-escalation disabled** but code preserved for future use.
- **Legacy models kept** with backward-compat aliases and preserved `db_table`.
- **Old API endpoints kept functional** for internal staff forms (gradual migration).
- **Import matches by `hospital+name_en`** to preserve existing Department IDs (critical for complaint FK integrity).
- **Hardcoded `MANUAL_MAP`** dict maps 136 legacy subsection PKs to department name strings for unmappable cases.
- **DB schema applied via raw SQL**, not Django migrations (production DB reconciliation).

---

## API Endpoints (New Hierarchy)

```
GET /organizations/dropdowns/departments-by-category/?category=medical
  → Returns: [{"id": "uuid", "name_en": "Internal Medicine", ...}, ...]

GET /organizations/dropdowns/sections/<uuid:department_id>/
  → Returns: [{"id": "uuid", "name_en": "Cardiology", ...}, ...]

GET /organizations/dropdowns/sub-subsections/<uuid:section_id>/
  → Returns: [{"id": "uuid", "name_en": "ECG Lab", ...}, ...]

GET /organizations/department-contacts/<uuid:dept_id>/
  → Returns: [{"staff_id": "uuid", "name": "Dr. X", "email": "...", "role_field": "champion", "role_label": "Champion"}, ...]

POST /organizations/set-role/
  Body: {department_id, role_field, staff_id (optional)}
  → Sets/clears a role FK on Department
```

---

## Migration Status

```
organizations
 [X] 0001_initial
 [X] 0002_rename_respondent_to_champion
 [X] 0003_alter_department_champion
 [X] 0004_legacylocation_legacymainsection_and_more
 [X] 0005_alter_legacylocation_table_and_more
 [X] 0006_alter_department_code_alter_orgsubsection_code_and_more
```

All migrations faked. DB schema in sync. Run with `--skip-checks` flag.

---

## 136-Entry Manual Mapping (MANUAL_MAP in backfill command)

The backfill command contains a hardcoded dict mapping 136 `LegacySubSection.internal_id` values to `Department.name_en` strings. These are legacy subsections that could not be automatically mapped via `LegacyHierarchyMapping` or name matching. Key distributions:

- Internal Medicine: ~14 entries
- Surgeries: ~11 entries
- Outpatient Department: ~10 entries
- Nursing Department: ~16 entries
- Emergency Department: ~6 entries
- Inpatient Department: ~7 entries
- Medical Ancillary Services: ~10 entries
- Others (Pediatric, Critical Care, OB/GYN, Pharmacy, IT, Security, Finance, etc.): 1-3 each

---

## File Tree Summary

```
apps/
├── organizations/
│   ├── models.py                          # Department, OrgSubSection, OrgSubSubSection, LegacyHierarchyMapping, Legacy*
│   ├── views.py                           # 4 new dropdown/contacts APIs + legacy ajax_* endpoints
│   ├── ui_views.py                        # department_detail, set_department_role
│   ├── urls.py                            # All URL patterns
│   ├── serializers.py                     # DepartmentSerializer, OrgSubSectionSerializer, OrgSubSubSectionSerializer
│   ├── management/commands/
│   │   ├── import_departments_excel.py    # Excel import (286 lines)
│   │   └── backfill_department_hierarchy.py # Backfill with MANUAL_MAP (284 lines)
│   └── migrations/
│       ├── 0001_initial.py
│       ├── 0002_rename_respondent_to_champion.py
│       ├── 0003_alter_department_champion.py
│       ├── 0004_legacylocation_legacymainsection_and_more.py
│       ├── 0005_alter_legacylocation_table_and_more.py
│       └── 0006_alter_department_code_alter_orgsubsection_code_and_more.py
├── complaints/
│   ├── models.py                          # Complaint (104 columns), with department, section, sub_subsection, legacy_*
│   ├── forms.py                           # PublicComplaintForm, ComplaintForm, InquiryForm, GovernmentTicketForm (legacy cascade)
│   ├── ui_views.py                        # complaint_list, complaint_detail, complaint_send_to, complaint_escalate, inquiry_escalate, government_ticket_*
│   ├── services/complaint_service.py      # ComplaintService.send_to_department
│   └── tasks.py                           # Auto-escalation disabled, check_overdue still active
├── observations/
│   ├── views.py                           # observation_escalate, observation_send_to
│   └── services.py                        # create_observation (accepts section, sub_subsection)
├── dashboard/services/
│   ├── complaint_monthly_service.py       # Uses location, main_section FK
│   ├── complaint_quarterly_service.py     # IP/OP/ER via location__name_en string matching
│   └── complaint_monthly_export.py        # Exports c.location.name
├── analytics/services/
│   └── kpi_service.py                     # Queries location + main_section FKs
└── core/views.py                          # public_inquiry_submit, public_observation_submit

templates/
├── complaints/
│   ├── public_complaint_form.html         # MIGRATED: Category→Department→Section→SubSection
│   ├── complaint_form.html                # NOT MIGRATED: Still uses old Location→MainSection→SubSection
│   ├── inquiry_form.html                  # NOT MIGRATED: Still uses old hierarchy
│   ├── government_ticket_form.html        # NOT MIGRATED: Still uses old hierarchy
│   ├── government_ticket_list.html        # NOT MIGRATED: Displays legacy_main_section.name_en
│   ├── government_ticket_detail.html      # NOT MIGRATED: Displays legacy_* fields
│   ├── complaint_detail.html              # NOT MIGRATED: Displays legacy_* fields
│   ├── complaint_pdf.html                 # NOT MIGRATED: Displays legacy_* fields
│   └── inquiry_detail.html                # NOT MIGRATED: Displays legacy_* fields
├── core/
│   └── public_submit.html                 # MIGRATED: 4 forms switched to new hierarchy
├── components/
│   └── send_to_modal.html                # MIGRATED: Contact person dropdown from role holders
└── organizations/
    └── department_detail.html             # MIGRATED: Roles tab with #roleModal

DB: db.sqlite3 (production copy)
```

---

## Troubleshooting

### If `showmigrations` shows pending migrations
```bash
python manage.py showmigrations --skip-checks --list
```

### If new tables are missing
Tables must be created manually (not via Django migrations):
```python
# Check if tables exist
from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name LIKE 'organizations_%'")
```

### If backfill shows 0 candidates
Check that `legacy_subsection_id` is set on complaints. Run the legacy FK backfill first.

### If import doesn't match existing departments
The import matches by `hospital + name_en`. Check the Excel column headers match what the command expects.

### System check errors
There are 4 pre-existing system check errors from `accounts.User.groups` vs `auth.User.groups` reverse accessor clash. These are NOT related to the hierarchy migration.