from contextlib import AbstractContextManager
from datetime import datetime
from typing import Optional
from urllib.parse import urljoin

import sqlalchemy
from selenium.webdriver import Firefox
from selenium.webdriver.common.by import By
from selenium.webdriver.firefox.options import Options

from .models import Resource, ResourceFlow, Factory, Recipe
from .provider import RecipeProvider
from ..helper import prompt


class SatisfactoryPlus(RecipeProvider, AbstractContextManager):
    _browser: Optional[Firefox] = None

    def __init__(self, debug: bool = False):
        super().__init__()
        self.debug = debug

    def _init_browser(self) -> Firefox:
        if self._browser is None:
            firefox_options = Options()
            firefox_options.add_argument("--width=1600")
            firefox_options.add_argument("--height=1015")
            if not self.debug:
                firefox_options.add_argument("--headless")
            self._browser = Firefox(options=firefox_options)
            self._browser.implicitly_wait(5)
        return self._browser

    def _browser_cleanup(self):
        if not self.debug and self._browser is not None:
            self._browser.quit()

    def _normalize_url(self, href: str) -> str:
        return urljoin(base=self._init_browser().current_url, url=href)

    def __enter__(self):
        return self

    def __exit__(self, __exc_type, __exc_value, __traceback):
        self._browser_cleanup()

    def search_for_resource(self, session: sqlalchemy.Session, search: str) -> tuple[Resource, bool] | None:
        browser = self._init_browser()
        browser.get("https://wiki.kyrium.space/")
        search_bar = browser.find_element(By.CSS_SELECTOR, "nav input[placeholder='Search for an item...']")
        search_bar.click()
        search_bar.send_keys(search)
        search_button = browser.find_element(By.CSS_SELECTOR, "nav button[type='submit']")
        search_button.click()
        choices = browser.find_elements(By.CSS_SELECTOR, "body > div > .container:nth-child(1) a.items-center")
        if not choices:
            print("No wiki entries found for this result")
            return None

        elif len(choices) > 1:
            default_choice = 1
            options: dict[int, str] = {}
            for idx in range(len(choices)):
                recipe_choice = choices[idx]
                name = recipe_choice.find_element(By.TAG_NAME, "img").get_attribute("alt")
                options[idx + 1] = name
                if name.casefold() == search.casefold():
                    default_choice = idx + 1
            user_choice = prompt(options=options, text="Chose a recipe to continue…", default=default_choice)
            if user_choice is None:
                return None
            link_html_elem = choices[user_choice - 1]
        else:
            link_html_elem = choices[0]

        alt_resource_label = link_html_elem.find_element(By.TAG_NAME, "img").get_attribute("alt")
        resource = session.scalars(Resource.by_label(alt_resource_label)).one_or_none()
        if resource:
            return resource, True
        else:
            resource_fetch_url = self._normalize_url(href=link_html_elem.get_attribute("href"))
            return Resource(label=alt_resource_label, wiki_url=resource_fetch_url), False

    def update_resource_recipes(self, session: sqlalchemy.Session, resource: Resource) -> Resource:
        assert resource.wiki_url, "Resource wiki url not set"
        browser = self._init_browser()
        browser.get(resource.wiki_url)
        browser.find_element(By.CSS_SELECTOR, "button[id$='tab-0']").click()
        recipes_html_elems = browser.find_elements(By.CSS_SELECTOR, "div[id$='tabpanel-0'] > div > div")
        resources: dict[str, Resource] = {}
        new_resources: list[Resource] = []

        for recipe_idx in range(len(recipes_html_elems)):
            recipe_html_elem = recipes_html_elems[recipe_idx]
            factory_html_elem = recipe_html_elem.find_element(By.CSS_SELECTOR, ".flex-col > span > a")
            factory_label = factory_html_elem.text.strip()
            factory_url = urljoin(base=browser.current_url, url=factory_html_elem.get_attribute("href"))

            def extract_resource_flow(html_elem):
                resource_img = html_elem.find_element(By.TAG_NAME, "img")
                resource_label = resource_img.get_attribute("alt").strip()
                assert resource_label, "resource label is missing"
                if resource_label in resources:
                    res = resources[resource_label]
                else:
                    res = session.scalars(Resource.by_label(resource_label)).one_or_none()
                    if not res:
                        wiki_url = self._normalize_url(
                            href=html_elem.find_element(By.TAG_NAME, "a").get_attribute("href"),
                        )
                        res = Resource(label=resource_label, wiki_url=wiki_url)
                        new_resources.append(res)
                    resources[resource_label] = res
                amount = html_elem.find_element(By.CSS_SELECTOR, ".text-xs:nth-child(2)").text.strip()
                time = html_elem.find_element(By.CSS_SELECTOR, ".text-xs:nth-child(3)").text.strip()
                return ResourceFlow(resource=res, amount=amount, time=time)

            ingredient_html_elems = recipe_html_elem.find_elements(
                By.CSS_SELECTOR, f".flex-row > div:nth-child(1) > div:has(> a)"
            )
            ingredients: list[ResourceFlow] = []
            for ingredient_idx in range(len(ingredient_html_elems)):
                resource_flow = extract_resource_flow(ingredient_html_elems[ingredient_idx])
                ingredients.append(resource_flow)
            result_html_elems = recipe_html_elem.find_elements(
                By.CSS_SELECTOR, f".flex-row > div:nth-child(3) > div:has(> a)"
            )
            results: list[ResourceFlow] = []
            for result_idx in range(len(result_html_elems)):
                resource_flow = extract_resource_flow(result_html_elems[result_idx])
                results.append(resource_flow)

            with session.no_autoflush:
                # re-use existing Factory or create new
                factory = session.scalars(Factory.by_label(factory_label)).one_or_none()
                if not factory:
                    factory = Factory(label=factory_label, wiki_url=factory_url)
                    session.add(factory)

                session.add_all(new_resources)
                session.add_all(ingredients)
                session.add_all(results)
                session.add(Recipe(factory=factory, ingredients=ingredients, results=results))
                session.flush()

        # refresh by label, because id might not be set
        updated_resource = session.scalars(Resource.by_label(resource.label)).one()
        updated_resource.recipes_populated_at = datetime.utcnow()
        session.flush()
        return updated_resource