from __future__ import annotations

import os
from typing import Any

import requests
from fastapi import FastAPI, File, Form, HTTPException, UploadFile
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from requests_oauthlib import OAuth1


class PortalFornecedorSuccessResponse(BaseModel):
    success: bool = True
    message: str
    processInstanceId: str = ""
    content: dict[str, Any]


class PortalFornecedorErrorDetail(BaseModel):
    message: str | None = None


def env(name: str, default: str = "") -> str:
    value = os.getenv(name, default).strip()
    if not value:
        raise RuntimeError(f"Missing environment variable: {name}")
    return value


app = FastAPI(title="Portal Fornecedor Proxy")

app.add_middleware(
    CORSMiddleware,
    allow_origins=os.getenv("PORTAL_FORNECEDOR_CORS_ORIGINS", "*").split(","),
    allow_credentials=False,
    allow_methods=["POST", "OPTIONS", "GET"],
    allow_headers=["*"],
)


@app.get("/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


@app.post(
    "/api/public/portalfornecedor/enviar",
    response_model=PortalFornecedorSuccessResponse,
    responses={
        400: {"model": PortalFornecedorErrorDetail},
        401: {"model": PortalFornecedorErrorDetail},
        500: {"model": PortalFornecedorErrorDetail},
    },
)
async def enviar(
    arquivo: UploadFile = File(...),
    targetState: int = Form(5),
    comment: str = Form("Envio via portal fornecedor"),
    data_abertura: str = Form(...),
    emitido_por: str = Form(...),
    entidade_responsavel: str = Form(...),
    tipo_cadastro: str = Form(...),
    emailSolicitante: str = Form(""),
    cpf: str = Form(...),
    tipo_documento: str = Form(""),
    numero_documento: str = Form(...),
    valor: str = Form(""),
    justificativa: str = Form(...),
) -> PortalFornecedorSuccessResponse:
    file_name = arquivo.filename or "anexo"
    file_mime = arquivo.content_type or "application/octet-stream"
    file_bytes = await arquivo.read()

    if not file_bytes:
        raise HTTPException(status_code=400, detail={"message": "Arquivo obrigatorio."})

    auth = build_auth()
    upload_binary(file_name, file_bytes, auth)
    document_id = create_document(file_name, file_mime, auth)

    process_payload = {
        "targetState": targetState,
        "comment": comment,
        "formFields": {
            "data_abertura": data_abertura,
            "emitido_por": emitido_por,
            "entidade_responsavel": entidade_responsavel,
            "tipo_cadastro": tipo_cadastro,
            "emailSolicitante": emailSolicitante,
            "cpf": cpf,
            "tipo_documento": tipo_documento,
            "numero_documento": numero_documento,
            "valor": valor,
            "justificativa": justificativa,
            "anexo_documento_id": str(document_id),
            "anexo_documento_nome": file_name,
            "anexo_documento_mime": file_mime,
        },
    }

    response = requests.post(
        process_start_endpoint(),
        json=process_payload,
        auth=auth,
        headers={"Accept": "application/json"},
        timeout=30,
    )

    if not response.ok:
        raise HTTPException(status_code=response.status_code, detail=safe_json(response))

    data = safe_json(response)

    return PortalFornecedorSuccessResponse(
        success=True,
        message="Solicitacao enviada com sucesso.",
        processInstanceId=extract_process_instance_id(data),
        content=data,
    )


def build_auth() -> OAuth1:
    return OAuth1(
        client_key=env("PORTAL_FORNECEDOR_CLIENT_KEY"),
        client_secret=env("PORTAL_FORNECEDOR_CLIENT_SECRET"),
        resource_owner_key=env("PORTAL_FORNECEDOR_RESOURCE_OWNER_KEY"),
        resource_owner_secret=env("PORTAL_FORNECEDOR_RESOURCE_OWNER_SECRET"),
        signature_method="HMAC-SHA1",
    )


def base_url() -> str:
    return env("PORTAL_FORNECEDOR_BASE_URL").rstrip("/")


def process_start_endpoint() -> str:
    process_id = env("PORTAL_FORNECEDOR_PROCESS_ID", "FlowEssentials_LancamentodeDocumento")
    return f"{base_url()}/process-management/api/v2/processes/{process_id}/start"


def upload_binary(file_name: str, file_bytes: bytes, auth: OAuth1) -> None:
    response = requests.post(
        f"{base_url()}/api/public/2.0/contentfiles/upload/",
        params={"fileName": file_name},
        data=file_bytes,
        auth=auth,
        headers={
            "Content-Type": "application/octet-stream",
            "Accept": "application/json",
        },
        timeout=30,
    )

    if not response.ok:
        raise HTTPException(status_code=response.status_code, detail=safe_json(response))


def create_document(file_name: str, mime_type: str, auth: OAuth1) -> str:
    payload = {
        "companyId": env("PORTAL_FORNECEDOR_COMPANY_ID", "1"),
        "description": file_name,
        "parentId": int(env("PORTAL_FORNECEDOR_PARENT_FOLDER_ID", "10")),
        "immutable": True,
        "isPrivate": False,
        "downloadEnabled": True,
        "attachments": [{"fileName": file_name}],
        "additionalComments": mime_type,
    }

    response = requests.post(
        f"{base_url()}/api/public/ecm/document/createDocument",
        json=payload,
        auth=auth,
        headers={"Accept": "application/json"},
        timeout=30,
    )

    if not response.ok:
        raise HTTPException(status_code=response.status_code, detail=safe_json(response))

    data = safe_json(response)
    content = data.get("content", {}) if isinstance(data, dict) else {}
    document_id = content.get("id") or content.get("documentId")

    if not document_id:
        raise HTTPException(status_code=500, detail={"message": "Fluig nao retornou documentId do anexo."})

    return str(document_id)


def safe_json(response: requests.Response) -> Any:
    try:
        return response.json()
    except Exception:
        return {"message": response.text}


def extract_process_instance_id(data: Any) -> str:
    if not isinstance(data, dict):
        return ""
    if data.get("processInstanceId"):
        return str(data["processInstanceId"])

    content = data.get("content")
    if isinstance(content, dict):
        if content.get("processInstanceId"):
            return str(content["processInstanceId"])
        if content.get("processInstanceid"):
            return str(content["processInstanceid"])
        if content.get("requestNumber"):
            return str(content["requestNumber"])

    return ""