added solve endpoint, as well as types for request object usaged as well as validation

app/main.py

@@ -1,7 +1,67 @@
 from fastapi import FastAPI, __version__
+from pydantic import BaseModel
+from typing import Set, List, Optional, Dict
 
 app = FastAPI()
 
+class MetaData(BaseModel):
+  key: str
+  value: str
+  field_id: Optional[int]
+  option_id: Optional[int]
+
+class Item(BaseModel):
+  id: int
+  metadata: List[MetaData]
+
+class Constraint(BaseModel):
+  key: str
+  value: str
+  field_id: Optional[int]
+  option_id: Optional[int]
+  minimum: int
+  maximum: int
+
+class IRTModel(BaseModel):
+  a_param: float
+  b_param: float
+  c_param: float
+  model: str
+
+class Targets(BaseModel):
+  neg_2_5: int
+  neg_1_5: int
+  neg_0_5: int
+  _0_5: int
+  _1: int
+
+class ObjectiveFunction(BaseModel):
+  # minimizing tif/tcc target value is only option currently
+  # as we add more we can build this out to be more dynamic
+  # likely with models representing each objective function type
+  tif_targets: Targets
+  tcc_targets: Targets
+  weight: Dict = {'tif': 1, 'tcc': 1}
+
+class AdvancedOptions(BaseModel):
+  # will supported currently
+  linearity_check: bool
+  show_progress: bool
+  max_solution_time: Optional[int]
+  brand_bound_tolerance: Optional[float]
+  max_forms: Optional[int]
+  precision: Optional[float]
+  extra_param_range: Optional[List[Dict]]
+
+class SolverContent(BaseModel):
+  items: List[Item]
+  constraints: List[Constraint]
+  irt_model: IRTModel
+  objective_fuction: ObjectiveFunction
+  total_form_items: int
+  advanced_options: Optional[List[AdvancedOptions]]
+  engine: str
+
 @app.get("/")
 async def root():
   return {"message": "Welcome to Measures LOFT solver service. v0.1"}
@@ -13,10 +73,14 @@ async def health():
     "git_repo": "https://github.com/yardstick/measure-solver",
     "server": "OK",
     "fastapi version": __version__,
-    "app version": "0.1.0"
+    "app version": "0.1.1"
   }
   return content
 
 @app.get('/readycheck')
 async def ready():
   return 'OK'  # just means we're on air
+
+@app.post('/solve/')
+async def solve(solver_content: SolverContent):
+  return solver_content