from __future__ import annotations

from types import SimpleNamespace
from unittest.mock import patch

from django.test import TestCase, override_settings
from rest_framework.test import APIClient

from plant.models import Plant

from .growth_simulation import paginate_growth_stages, run_growth_simulation


@override_settings(ROOT_URLCONF="crop_simulation.urls")
class PlantGrowthSimulationApiTests(TestCase):
    def setUp(self):
        self.client = APIClient()
        self.plant = Plant.objects.create(
            name="گوجه‌فرنگی",
            growth_profile={
                "base_temperature": 10,
                "required_gdd_for_maturity": 1200,
                "current_cumulative_gdd": 50,
            },
        )
        self.weather = [
            {
                "DAY": "2026-04-01",
                "LAT": 35.7,
                "LON": 51.4,
                "TMIN": 12,
                "TMAX": 24,
                "RAIN": 0.0,
                "ET0": 0.32,
            },
            {
                "DAY": "2026-04-02",
                "LAT": 35.7,
                "LON": 51.4,
                "TMIN": 13,
                "TMAX": 25,
                "RAIN": 0.0,
                "ET0": 0.34,
            },
            {
                "DAY": "2026-04-03",
                "LAT": 35.7,
                "LON": 51.4,
                "TMIN": 14,
                "TMAX": 27,
                "RAIN": 1.0,
                "ET0": 0.36,
            },
        ]

    def test_run_growth_simulation_returns_stage_timeline(self):
        result = run_growth_simulation(
            {
                "plant_name": self.plant.name,
                "dynamic_parameters": ["DVS", "LAI", "TAGP"],
                "weather": self.weather,
                "soil_parameters": {"SMFCF": 0.34, "SMW": 0.14, "RDMSOL": 120.0},
                "site_parameters": {"WAV": 40.0},
                "page_size": 2,
            }
        )

        self.assertEqual(result["plant_name"], self.plant.name)
        self.assertGreaterEqual(result["daily_records_count"], 3)
        self.assertTrue(result["stage_timeline"])
        self.assertEqual(result["pagination"]["page_size"], 2)

    @patch("crop_simulation.views.run_growth_simulation_task.delay")
    def test_queue_api_returns_task_id(self, mock_delay):
        mock_delay.return_value = SimpleNamespace(id="growth-task-1")

        response = self.client.post(
            "/growth/",
            data={
                "plant_name": self.plant.name,
                "dynamic_parameters": ["DVS", "LAI"],
                "weather": self.weather,
            },
            format="json",
        )

        self.assertEqual(response.status_code, 202)
        self.assertEqual(response.json()["data"]["task_id"], "growth-task-1")

    @patch("crop_simulation.views._get_async_result")
    def test_status_api_returns_paginated_stages(self, mock_get_async_result):
        stage_timeline = [
            {
                "order": 1,
                "stage_code": "establishment",
                "stage_name": "استقرار",
                "start_date": "2026-04-01",
                "end_date": "2026-04-02",
                "days_count": 2,
                "metrics": {"DVS": {"start": 0.1, "end": 0.2, "min": 0.1, "max": 0.2, "avg": 0.15}},
            },
            {
                "order": 2,
                "stage_code": "vegetative",
                "stage_name": "رشد رویشی",
                "start_date": "2026-04-03",
                "end_date": "2026-04-05",
                "days_count": 3,
                "metrics": {"DVS": {"start": 0.3, "end": 0.8, "min": 0.3, "max": 0.8, "avg": 0.55}},
            },
            {
                "order": 3,
                "stage_code": "flowering",
                "stage_name": "گلدهی",
                "start_date": "2026-04-06",
                "end_date": "2026-04-07",
                "days_count": 2,
                "metrics": {"DVS": {"start": 1.0, "end": 1.2, "min": 1.0, "max": 1.2, "avg": 1.1}},
            },
        ]
        mock_get_async_result.return_value = SimpleNamespace(
            state="SUCCESS",
            result={
                "plant_name": self.plant.name,
                "dynamic_parameters": ["DVS"],
                "engine": "growth_projection",
                "model_name": "growth_projection_v1",
                "scenario_id": None,
                "simulation_warning": None,
                "summary_metrics": {},
                "stage_timeline": stage_timeline,
                "stages_page": stage_timeline[:1],
                "pagination": paginate_growth_stages(stage_timeline, page=1, page_size=1)["pagination"],
                "daily_records_count": 7,
                "default_page_size": 1,
            },
        )

        response = self.client.get("/growth/growth-task-1/status/?page=2&page_size=1")

        self.assertEqual(response.status_code, 200)
        payload = response.json()["data"]["result"]
        self.assertEqual(payload["pagination"]["page"], 2)
        self.assertEqual(len(payload["stages_page"]), 1)
        self.assertEqual(payload["stages_page"][0]["stage_code"], "vegetative")