import json
from argparse import ArgumentParser
from io import BytesIO
from typing import Any

from locust import HttpUser, events, task
from locust.env import Environment
from PIL import Image

byte_image = BytesIO()


@events.init_command_line_parser.add_listener
def _(parser: ArgumentParser) -> None:
    parser.add_argument("--tag-model", type=str, default="microsoft/resnet-50")
    parser.add_argument("--clip-model", type=str, default="ViT-B-32::openai")
    parser.add_argument("--face-model", type=str, default="buffalo_l")
    parser.add_argument(
        "--tag-min-score",
        type=int,
        default=0.0,
        help="Returns all tags at or above this score. The default returns all tags.",
    )
    parser.add_argument(
        "--face-min-score",
        type=int,
        default=0.034,
        help=(
            "Returns all faces at or above this score. The default returns 1 face per request; "
            "setting this to 0 blows up the number of faces to the thousands."
        ),
    )
    parser.add_argument("--image-size", type=int, default=1000)


@events.test_start.add_listener
def on_test_start(environment: Environment, **kwargs: Any) -> None:
    global byte_image
    assert environment.parsed_options is not None
    image = Image.new("RGB", (environment.parsed_options.image_size, environment.parsed_options.image_size))
    byte_image = BytesIO()
    image.save(byte_image, format="jpeg")


class InferenceLoadTest(HttpUser):
    abstract: bool = True
    host = "http://127.0.0.1:3003"
    data: bytes
    headers: dict[str, str] = {"Content-Type": "image/jpg"}

    # re-use the image across all instances in a process
    def on_start(self) -> None:
        global byte_image
        self.data = byte_image.getvalue()


class ClassificationFormDataLoadTest(InferenceLoadTest):
    @task
    def classify(self) -> None:
        data = [
            ("modelName", self.environment.parsed_options.clip_model),
            ("modelType", "clip"),
            ("options", json.dumps({"minScore": self.environment.parsed_options.tag_min_score})),
        ]
        files = {"image": self.data}
        self.client.post("/predict", data=data, files=files)


class CLIPTextFormDataLoadTest(InferenceLoadTest):
    @task
    def encode_text(self) -> None:
        data = [
            ("modelName", self.environment.parsed_options.clip_model),
            ("modelType", "clip"),
            ("options", json.dumps({"mode": "text"})),
            ("text", "test search query"),
        ]
        self.client.post("/predict", data=data)


class CLIPVisionFormDataLoadTest(InferenceLoadTest):
    @task
    def encode_image(self) -> None:
        data = [
            ("modelName", self.environment.parsed_options.clip_model),
            ("modelType", "clip"),
            ("options", json.dumps({"mode": "vision"})),
        ]
        files = {"image": self.data}
        self.client.post("/predict", data=data, files=files)


class RecognitionFormDataLoadTest(InferenceLoadTest):
    @task
    def recognize(self) -> None:
        data = [
            ("modelName", self.environment.parsed_options.face_model),
            ("modelType", "facial-recognition"),
            ("options", json.dumps({"minScore": self.environment.parsed_options.face_min_score})),
        ]
        files = {"image": self.data}

        self.client.post("/predict", data=data, files=files)