main.py

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import Optional
class NoteCreate(BaseModel):
    title: str           # required
    content: str         # required
    is_important: bool = False
class NoteUpdate(BaseModel):
    title: Optional[str] = None      
    content: Optional[str] = None
    is_important: Optional[bool] = None  
notes_ls = []
counter = 1   
app = FastAPI()

@app.get("/")
def landing_msg():
    return{"msg": "Welcome to Notes Application. "}

@app.get("/notes")
def get_all_notes(keyword: str = None):
    match_notes = []
    if keyword is not None:
        for note in notes_ls:
            if keyword.lower() in note["title"].lower():
                match_notes.append(note)
        if match_notes:
            return match_notes
        else:
            raise HTTPException(status_code=404, detail="Note does not exist. ")
    else:
        return{"TotalNotes": len(notes_ls), "Notes": notes_ls}

@app.get("/notes/important")
def get_note_by_imp():
    imp_notes = []
    for note in notes_ls:
        if note["is_important"] == True:
            imp_notes.append(note)
    if imp_notes:
        return imp_notes    
    else:
        raise HTTPException(status_code=404, detail="Note not found")

@app.get("/notes/{note_id}")
def get_note_by_id(note_id: int):
    for note in notes_ls:
        if note["id"] == note_id:
            return{"title": note['title'], "Details": note['content']}
    raise HTTPException(status_code=404, detail="Note not found")

@app.delete("/notes/{note_id}")
def del_note_by_id(note_id: int):
    for note in notes_ls:
        if note["id"] == note_id:
            notes_ls.remove(note)
            return{"msg": "Note Deleted Successfully. "}
    raise HTTPException(status_code=404, detail="Note not Exist. ")

@app.post("/notes")
def create_notes(note: NoteCreate):
    global counter
    title = note.title.strip()
    content = note.content.strip()
    if not title or not content:
        raise HTTPException(status_code=422, detail="Title and content cannot be empty")
    new_note = {"id": counter, "title": title, "content": content, "is_important": note.is_important}
    notes_ls.append(new_note)
    counter += 1
    return {"message": "Note created!", "note": new_note}
@app.put("/notes/{note_id}")
def update_note(note_id: int, note: NoteUpdate):
    for reqnote in notes_ls:
        if reqnote["id"] == note_id:
            if note.title is not None or note.content is not None or note.is_important is not None:
                if note.title is not None:
                    reqnote["title"] = note.title
                if note.content is not None:
                    reqnote["content"] = note.content
                if note.is_important is not None:
                    reqnote["is_important"] = note.is_important
                return{"msg": "Note is Updated Successfully. "}
            else:
                raise HTTPException(status_code=422, detail="Details are missing. ")
    raise HTTPException(status_code=404, detail="Note does not exist. ")