"""
Link Employee → Dispatch Technician and populate technicians from active staff.
Run inside erpnext-backend-1:
  /home/frappe/frappe-bench/env/bin/python /home/frappe/frappe-bench/import_technicians.py
"""
import frappe
import os
import time
from datetime import datetime

os.chdir("/home/frappe/frappe-bench/sites")
frappe.init(site="erp.gigafibre.ca", sites_path=".")
frappe.connect()
frappe.local.flags.ignore_permissions = True
print("Connected:", frappe.local.site)

now_str = datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")

# ═══════════════════════════════════════════════════════════════
# PHASE 1: Add 'employee' Link field to Dispatch Technician
# ═══════════════════════════════════════════════════════════════
print("\n" + "="*60)
print("PHASE 1: ADD EMPLOYEE LINK FIELD")
print("="*60)

existing = frappe.db.sql("""
    SELECT fieldname FROM "tabDocField"
    WHERE parent = 'Dispatch Technician' AND fieldname = 'employee'
""")

if not existing:
    # Get max idx
    max_idx = frappe.db.sql("""
        SELECT COALESCE(MAX(idx), 0) FROM "tabDocField"
        WHERE parent = 'Dispatch Technician'
    """)[0][0]

    frappe.db.sql("""
        INSERT INTO "tabDocField" (
            name, creation, modified, modified_by, owner, docstatus, idx,
            parent, parentfield, parenttype,
            fieldname, label, fieldtype, options, reqd, read_only, hidden
        ) VALUES (
            %(name)s, %(now)s, %(now)s, 'Administrator', 'Administrator', 0, %(idx)s,
            'Dispatch Technician', 'fields', 'DocType',
            'employee', 'Employee', 'Link', 'Employee', 0, 0, 0
        )
    """, {
        "name": "dt-employee-link-{}".format(int(time.time())),
        "now": now_str,
        "idx": max_idx + 1,
    })

    # Add the column to the actual table
    try:
        frappe.db.sql("""
            ALTER TABLE "tabDispatch Technician" ADD COLUMN employee varchar(140)
        """)
    except Exception as e:
        if "already exists" in str(e).lower() or "duplicate" in str(e).lower():
            print("Column 'employee' already exists")
        else:
            raise

    frappe.db.commit()
    print("Added 'employee' Link field to Dispatch Technician")
else:
    print("'employee' field already exists on Dispatch Technician")

# ═══════════════════════════════════════════════════════════════
# PHASE 2: Clear test technicians and populate from employees
# ═══════════════════════════════════════════════════════════════
print("\n" + "="*60)
print("PHASE 2: POPULATE TECHNICIANS FROM EMPLOYEES")
print("="*60)

# Delete existing test technicians
existing_techs = frappe.db.sql('SELECT COUNT(*) FROM "tabDispatch Technician"')[0][0]
if existing_techs > 0:
    frappe.db.sql('DELETE FROM "tabDispatch Technician"')
    frappe.db.commit()
    print("Deleted {} test technicians".format(existing_techs))

# Get active employees in tech/support/sysadmin roles (Operations + Customer Service departments)
# These are the staff who do field work or dispatch-related tasks
employees = frappe.db.sql("""
    SELECT name, employee_name, employee_number, cell_number, company_email,
           department, designation, status
    FROM "tabEmployee"
    WHERE status = 'Active'
      AND department IN ('Operations - T', 'Customer Service - T', 'Management - T')
    ORDER BY name
""", as_dict=True)

print("Active dispatch-eligible employees: {}".format(len(employees)))

counter = 0
for emp in employees:
    counter += 1
    tech_id = "TECH-{}".format(emp["employee_number"])
    tech_name = tech_id  # document name

    frappe.db.sql("""
        INSERT INTO "tabDispatch Technician" (
            name, creation, modified, modified_by, owner, docstatus, idx,
            technician_id, full_name, phone, email, status, employee
        ) VALUES (
            %(name)s, %(now)s, %(now)s, 'Administrator', 'Administrator', 0, 0,
            %(tech_id)s, %(full_name)s, %(phone)s, %(email)s, 'Disponible', %(employee)s
        )
    """, {
        "name": tech_name,
        "now": now_str,
        "tech_id": tech_id,
        "full_name": emp["employee_name"],
        "phone": emp["cell_number"],
        "email": emp["company_email"],
        "employee": emp["name"],
    })

frappe.db.commit()
print("Created {} Dispatch Technicians".format(counter))

# ═══════════════════════════════════════════════════════════════
# PHASE 3: VERIFY
# ═══════════════════════════════════════════════════════════════
print("\n" + "="*60)
print("PHASE 3: VERIFY")
print("="*60)

techs = frappe.db.sql("""
    SELECT name, technician_id, full_name, phone, email, employee
    FROM "tabDispatch Technician"
    ORDER BY name
""", as_dict=True)

print("Total Dispatch Technicians: {}".format(len(techs)))
for t in techs:
    print("  {} → {} phone={} email={} emp={}".format(
        t["technician_id"], t["full_name"],
        t["phone"] or "-", t["email"] or "-", t["employee"]))

# Clear cache
frappe.clear_cache()
print("\nCache cleared — Dispatch Technician doctype updated")