# -*- coding: utf-8 -*-
# Copyright 2013 DEVSIM LLC
#
# SPDX-License-Identifier: Apache-2.0

##Title: cap1.py
##Purpose: Simple example for 1D capacitor
from devsim import (
    add_1d_contact,
    add_1d_mesh_line,
    add_1d_region,
    contact_equation,
    create_1d_mesh,
    create_device,
    edge_from_node_model,
    edge_model,
    equation,
    finalize_mesh,
    get_contact_charge,
    get_parameter,
    node_model,
    node_solution,
    set_parameter,
    solve,
)


device_info = {"device": "MyDevice"}
region_info = device_info
region_info["region"] = "MyRegion"

# print region_info
device = "MyDevice"
region = "MyRegion"

create_1d_mesh(mesh="dog")
for p, s, t in ((0.0, 0.1, "top"), (1.0, 0.1, "bot")):
    add_1d_mesh_line(mesh="dog", pos=p, ps=s, tag=t)

for t in ("top", "bot"):
    add_1d_contact(mesh="dog", name=t, material="metal", tag=t)

add_1d_region(mesh="dog", material="Si", region=region, tag1="top", tag2="bot")
finalize_mesh(mesh="dog")
create_device(mesh="dog", device=device)

# for i in get_device_list():
#  print i


set_parameter(name="Permittivity", value=(3.9 * 8.85e-14), **region_info)
set_parameter(name="ElectricCharge", value=1.6e-19, **region_info)

print((get_parameter(name="Permittivity", **region_info)))
print((get_parameter(name="ElectricCharge", **region_info)))

node_solution(name="ψ", **region_info)
edge_from_node_model(node_model="ψ", **region_info)

for n, e in (
    ("ElectricField", "(ψ@n0 - ψ@n1)*EdgeInverseLength;"),
    ("ElectricField:ψ@n0", "EdgeInverseLength;"),
    ("ElectricField:ψ@n1", "-EdgeInverseLength;"),
):
    edge_model(name=n, equation=e, **region_info)

set_parameter(name="topbias", value=1.0e-0, **region_info)
set_parameter(name="botbias", value=0.0, **region_info)

for n, e in (
    ("ψEdgeFlux", "Permittivity*ElectricField;"),
    ("ψEdgeFlux:ψ@n0", "diff(Permittivity*ElectricField, ψ@n0);"),
    ("ψEdgeFlux:ψ@n1", "-ψEdgeFlux:ψ@n0;"),
):
    edge_model(name=n, equation=e, **region_info)

equation(
    name="ψEquation",
    variable_name="ψ",
    node_model="",
    edge_model="ψEdgeFlux",
    time_node_model="",
    variable_update="default",
    **region_info,
)

conteq = "Permittivity*ElectricField;"
node_model(name="topnode_model", equation="ψ - topbias;", **region_info)
node_model(name="topnode_model:ψ", equation="1;", **region_info)
edge_model(name="contactcharge_edge_top", equation=conteq, **region_info)

node_model(name="botnode_model", equation="ψ - botbias;", **region_info)
node_model(name="botnode_model:ψ", equation="1;", **region_info)
edge_model(name="contactcharge_edge_bottom", equation=conteq, **region_info)

contact_equation(
    device=device,
    contact="top",
    name="ψEquation",
    node_model="topnode_model",
    edge_model="",
    node_charge_model="",
    edge_charge_model="contactcharge_edge_top",
    node_current_model="",
    edge_current_model="",
)

contact_equation(
    device=device,
    contact="bot",
    name="ψEquation",
    node_model="botnode_model",
    edge_model="",
    node_charge_model="",
    edge_charge_model="contactcharge_edge_bottom",
    node_current_model="",
    edge_current_model="",
)


solve(type="dc", absolute_error=1.0, relative_error=1e-10, maximum_iterations=30)

print((get_contact_charge(device=device, contact="top", equation="ψEquation")))
print((get_contact_charge(device=device, contact="bot", equation="ψEquation")))

# write_devices(file='cap1.msh', type='devsim')