import random
import urllib.parse

import requests

from edmond.plugin import Plugin

BASE_URL = "https://taxref.mnhn.fr/api"


class TaxrefPlugin(Plugin):

    REQUIRED_CONFIGS = [
        "commands", "not_found_reply", "reply", "ambiguous_reply",
        "unnamed_species"
    ]

    def __init__(self, bot):
        super().__init__(bot)

    def on_pubmsg(self, event):
        if not self.should_handle_command(event.arguments[0]):
            return False

        # "taxref"
        if self.command.ident == self.config["commands"][0]:
            self.search_by_name(self.command.content, event.target)
        # "scientifize"
        if self.command.ident == self.config["commands"][1]:
            self.find_scientific_name(self.command.content, event.target)
        return True

    def search_by_name(self, name, target):
        """Get species data from a scientific name.

        Try to disambiguate the results by focusing on species only and their
        scientific name.
        """
        name = name.lower()
        enc_name = urllib.parse.quote(name)
        url = (
            f"{BASE_URL}/taxa/search?scientificNames={enc_name}"
            "&page=1&size=100"
        )
        response = requests.get(url)
        if response.status_code != 200:
            self.signal_failure(target)
            return
        data = response.json()
        items = data.get("_embedded", {}).get("taxa", [])

        if not items:
            self.bot.say(target, self.config["not_found_reply"])
            return

        if len(items) == 1:
            # Only one result: use it.
            item_to_use = items[0]
        else:
            # More than one result: if the results contain a corresponding
            # species, use it, else return names for sub-species etc.
            species_items = []
            for item in items:
                if item["rankId"] == "ES":
                    species_items.append(item)
            num_species = len(species_items)
            self.bot.log_d(f"{num_species} species.")
            if num_species == 1:
                item_to_use = species_items[0]
            else:
                # If there are several species, check if one of them has the
                # exact same name; else show an ambiguous reply.
                species_with_same_name = [
                    item for item in species_items
                    if item["scientificName"].lower() == name
                ]
                if len(species_with_same_name) != 1:
                    reply = self.get_ambiguous_reply(species_items)
                    self.bot.say(target, reply)
                    return
                item_to_use = species_with_same_name[0]

        unnamed = self.config["unnamed_species"]
        reply = self.config["reply"].format(
            sci_name=item_to_use["scientificName"],
            fr_name=item_to_use["frenchVernacularName"] or unnamed,
            family=item_to_use["familyName"],
            cd_nom=item_to_use["id"],
            cd_ref=item_to_use["referenceId"],
        )
        self.bot.say(target, reply)

        if (images_reply := self.get_images_reply(item_to_use)):
            self.bot.say(target, images_reply)

    def get_ambiguous_reply(self, items):
        """Show a reply with potential species."""
        reply = self.config["ambiguous_reply"]
        append = ""
        if len(items) > 5:
            append = f"… (+{len(items)})"
            items = items[:5]
        reply += ", ".join(item["scientificName"] for item in items)
        if append:
            reply += append
        return reply

    def get_images_reply(self, item):
        """If there are media available, return one in a message.

        Return a string with an URL to an image if one is available, or an
        None if no image could be found or we encountered an error.
        """
        m_url = item.get("_links", {}).get("media", {}).get("href")
        if not m_url:
            return None

        response = requests.get(m_url)
        if response.status_code != 200:
            return None
        media_data = response.json()
        items = media_data.get("_embedded", {}).get("media", [])
        if not items:
            return None

        random_item = random.choice(items)
        media_href = random_item.get("_links", {}).get("file", {}).get("href")
        if not media_href:
            return None
        return "📷 " + media_href

    def find_scientific_name(self, name, target):
        """Find a corresponding scientific name for a vernacular name."""
        name = name.lower()
        enc_name = urllib.parse.quote(name)
        url = (
            f"{BASE_URL}/taxa/search?frenchVernacularNames={enc_name}"
            "&page=1&size=100"
        )
        response = requests.get(url)
        if response.status_code != 200:
            self.signal_failure(target)
            return
        data = response.json()
        items = data.get("_embedded", {}).get("taxa", [])

        if not items:
            self.bot.say(target, self.config["not_found_reply"])
            return

        if len(items) == 1:
            # Only one result: use it.
            reply = items[0].get("scientificName")
        else:
            # More than one result? For simplicity sake, use the shrlok plugin
            # if available or just show an ambiguous response.
            if (shrlok := self.bot.get_plugin("shrlok")):
                text = "\n".join(
                    f"{i['frenchVernacularName']} → {i['scientificName']}"
                    for i in items
                ) + "\n"
                reply = shrlok.post_text(text)
            else:
                reply = self.get_ambiguous_reply(items)

        self.bot.say(target, reply)