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app.py
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app.py
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from pathlib import Path
from fastapi.staticfiles import StaticFiles
from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
from fastapi_htmx import htmx, htmx_init
from jinja2 import Template
import logging
from calc import get_selectbox_block_numbers
from pydantic import BaseModel
class BlockType(BaseModel):
id: int
type: str = "empty"
model: str = "block_model"
css_class: str = "block-default empty"
hx: str = ""
# TODO
# - add blockgrid to session state
# - add blockgrid to database
# - extend BLOCK_HX to include all possible hx attributes
# - fix refresh() method
BLOCKGRID_COLUMNS = 10
BLOCKGRID_ROWS = 6
NUM_BLOCKS = BLOCKGRID_COLUMNS * BLOCKGRID_ROWS
MODELS = ["amplifier", "filter-bp", "filter-hp",
"filter-lp", "mixer", "oscillator"]
BLOCK_HX = {
"default": "",
"empty": "hx-get=/blockgrid/{{id}}/select hx-swap=outerHTML hx-target=#block-grid",
"select": "hx-post=/blockgrid/{{id}}/select/{{component}} hx-swap=outerHTML hx-target=#block-grid",
"component": "",
}
EVENTS = {
"page_loaded": "page loaded",
"block_selected": "selection of an empty block to place a component",
"component_added": "add a component to selected block",
"component_selected": "selection of a component to edit properties",
"component_update": "update of a components properties",
"component_deleted": "delete a component from a block",
}
logging.basicConfig(level=logging.DEBUG)
app = FastAPI()
app.mount("/static", StaticFiles(directory="static"), name="static")
htmx_init(templates=Jinja2Templates(directory=Path("static") / "templates"))
class Block(BlockType):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.update_to_empty()
def render(self):
return self.model_dump()
@staticmethod
def get_model(model: str):
with open(Path("static") / "fig" / f"{model}.svg", "r") as f:
return f.read()
@staticmethod
def get_hx(hxtype, parameters):
template = Template(BLOCK_HX[hxtype])
return template.render(parameters)
@staticmethod
def get_css_class(new_class):
if new_class != "block-default":
return f"block-default {new_class}"
else:
return new_class
def update_to_empty(self):
self.type = "empty"
self.model = "block_model"
self.css_class = "block-default empty"
self.hx = self.get_hx("empty", parameters={"id": self.id})
def update_to_component(self, model: str):
self.model = self.get_model(model)
self.type = "component"
self.css_class = self.get_css_class(model)
self.hx = self.get_hx(
"component", parameters={"id": self.id, "component": model}
)
def update_to_select(self, clicked_block_id: int, model: str):
self.type = "select"
self.css_class = "block-select"
self.model = self.get_model(model)
self.hx = self.get_hx(
"select", parameters={"id": clicked_block_id, "component": model}
)
def update_from_block(self, block: BlockType):
self.type = block.type
self.model = block.model
self.css_class = block.css_class
self.hx = block.hx
class BlockGridMemory(BaseModel):
id: str
blocks: list[Block]
events: list[dict]
_listeners: list = []
def __post_init__(self):
for block in self.blocks:
block.update_to_empty()
def add_listener(self, listener):
self._listeners.append(listener)
def update_memory(self, event):
self.events.append(event)
logging.debug(f"event: {event}")
# Update memory based on the event
# Notify listeners of the change
for listener in self._listeners:
listener.on_memory_update(event)
def get_events(self):
return self.events
class BlockGrid(BaseModel):
id: str = "block-grid"
blocks: list[Block] = []
def __iter__(self) -> iter:
return iter(self.blocks)
def render(self) -> list[dict]:
return [block.render() for block in self.blocks]
def refresh_blocks_from(self, blocks: list[Block]) -> None:
for block in blocks:
self.blocks[block.id].update_from_block(block)
class PageAction:
def __init__(self, event_type: str, parameters: dict):
self.event_type = event_type
self.parameters = parameters
def emit(self, memory: BlockGridMemory) -> None:
memory.update_memory(self.get_event_data())
def get_event_data(self) -> dict:
return {"event_type": self.event_type, **self.parameters}
class BlockSelectedListener:
def __init__(self, memory):
self.memory = memory
def on_memory_update(self, event_data) -> None:
if event_data["event_type"] == "block_selected":
block_id = event_data["block_id"]
# Perform actions for block selection
select_box = self.get_blocks_to_mark(block_id)
# Emit an event to notify memory
self.memory.update_memory(
{
"event_type": "selectbox_created",
"block_id": block_id,
"select_box": select_box,
}
)
@staticmethod
def get_blocks_to_mark(clicked_block_id: int) -> list[Block]:
select_box = []
block_ids_to_mark = get_selectbox_block_numbers(
clicked_block_id, BLOCKGRID_COLUMNS, len(MODELS)
)
for i, mark in enumerate(block_ids_to_mark):
if i < len(MODELS):
marked_block = Block(id=mark)
marked_block.update_to_select(clicked_block_id, MODELS[i])
select_box.append(marked_block)
return select_box
class ComponentAddedListener:
def __init__(self, memory):
self.memory = memory
def on_memory_update(self, event_data):
if event_data["event_type"] == "component_added":
block_id = event_data["block_id"]
component = event_data["component"]
# Perform actions for component creation
memory = BlockGridMemory(
id="block-grid-memory", blocks=[Block(id=i) for i in range(NUM_BLOCKS)], events=[]
)
logging.debug(f"sample block 5: {memory.blocks[5]}")
grid = BlockGrid(id="block-grid", blocks=memory.blocks)
logging.debug(f"sample block 5: {grid.blocks[5]}")
block_selected_listener = BlockSelectedListener(memory)
component_added_listener = ComponentAddedListener(memory)
memory.add_listener(block_selected_listener)
memory.add_listener(component_added_listener)
# HTML Constructors
def construct_blockgrid(grid: BlockGrid):
return {
"blockgrid": grid.render(),
}
def construct_index(grid):
return {
**construct_blockgrid(grid),
}
# Routes/Endpoints/Views
@app.get("/", response_class=HTMLResponse)
@htmx("index", "index")
async def root_page(request: Request):
PageAction("page_loaded", {}).emit(memory)
return construct_index(grid)
@app.get("/blockgrid", response_class=HTMLResponse)
@htmx("blockgrid")
async def get_blockgrid(request: Request):
PageAction("page_loaded", {}).emit(memory)
return construct_blockgrid(grid)
@app.get("/blockgrid/{block_id}/select", response_class=HTMLResponse)
@htmx("blockgrid", "index")
async def select_block(request: Request, block_id: int):
PageAction("block_selected", {"block_id": block_id}).emit(memory)
return construct_blockgrid(grid)
@app.post("/blockgrid/{block_id}/select/{component}", response_class=HTMLResponse)
@htmx("blockgrid", "index")
async def component_select(request: Request, block_id: int, component: str):
PageAction("component_added", {"block_id": block_id, "component": component}).emit(
memory
)
return construct_blockgrid(grid)
@app.get("/events")
def get_event_data(request: Request) -> list:
return memory.events
if __name__ == "__main__":
import uvicorn
uvicorn.run("app:app", host="localhost", port=3002,
log_level="debug", reload=True)