import disnake
from disnake.ext import commands, tasks
import json
import asyncio
import os
from datetime import datetime, timezone
try:
    from zoneinfo import ZoneInfo
except ImportError:
    from backports.zoneinfo import ZoneInfo
from typing import Optional, Dict, Any

PARIS_TZ = ZoneInfo("Europe/Paris")
DATE_FORMAT = "%d/%m/%Y %H:%M"

ABSENCE_SETTINGS_FILE = "data/absence_settings.json"
ABSENCE_DATA_FILE = "data/absences.json"
file_lock = asyncio.Lock()

def load_settings(guild_id: int) -> dict:
    """Charge les paramètres d'absence pour un serveur"""
    if not os.path.exists(ABSENCE_SETTINGS_FILE):
        return {}
    try:
        with open(ABSENCE_SETTINGS_FILE, "r", encoding='utf-8') as f:
            return json.load(f).get(str(guild_id), {})
    except (json.JSONDecodeError, FileNotFoundError):
        return {}

def save_settings(guild_id: int, settings: dict) -> None:
    """Sauvegarde les paramètres d'absence"""
    data = {}
    if os.path.exists(ABSENCE_SETTINGS_FILE):
        try:
            with open(ABSENCE_SETTINGS_FILE, "r", encoding='utf-8') as f:
                data = json.load(f)
        except (json.JSONDecodeError, FileNotFoundError):
            pass
    
    data[str(guild_id)] = settings
    os.makedirs(os.path.dirname(ABSENCE_SETTINGS_FILE), exist_ok=True)
    with open(ABSENCE_SETTINGS_FILE, "w", encoding='utf-8') as f:
        json.dump(data, f, indent=4, ensure_ascii=False)

async def load_absences() -> dict:
    """Charge toutes les absences (tous serveurs confondus)"""
    async with file_lock:
        if not os.path.exists(ABSENCE_DATA_FILE):
            return {}
        try:
            with open(ABSENCE_DATA_FILE, "r", encoding='utf-8') as f:
                return json.load(f)
        except (json.JSONDecodeError, FileNotFoundError):
            return {}

async def save_absences(data: dict) -> None:
    """Sauvegarde toutes les absences"""
    async with file_lock:
        os.makedirs(os.path.dirname(ABSENCE_DATA_FILE), exist_ok=True)
        temp_file = ABSENCE_DATA_FILE + ".tmp"
        with open(temp_file, "w", encoding='utf-8') as f:
            json.dump(data, f, indent=4, ensure_ascii=False)
        os.replace(temp_file, ABSENCE_DATA_FILE)

def get_guild_absences(all_absences: dict, guild_id: int) -> dict:
    """Filtre les absences pour un serveur spécifique"""
    return all_absences.get(str(guild_id), {})

def update_guild_absences(all_absences: dict, guild_id: int, guild_data: dict) -> dict:
    """Met à jour les absences pour un serveur spécifique"""
    all_absences[str(guild_id)] = guild_data
    return all_absences

def get_paris_now():
    """Récupère l'heure actuelle à Paris"""
    return datetime.now(PARIS_TZ)

def parse_date(date_str: Optional[str]):
    """Parse une date au format JJ/MM/AAAA HH:MM en timezone Paris"""
    if not date_str:
        raise ValueError("Date vide")
    return datetime.strptime(date_str, DATE_FORMAT).replace(tzinfo=PARIS_TZ)

# --- MODALS & VIEWS ---

class AbsenceModal(disnake.ui.Modal):
    def __init__(self, superieur: Optional[disnake.Member] = None):
        super().__init__(title="Déclarer une Absence Staff", components=[self.motif, self.date_debut, self.date_fin])
        self.superieur = superieur

    motif = disnake.ui.TextInput(
        label="Motif de l'absence",
        style=disnake.TextInputStyle.paragraph,
        placeholder="Ex: Vacances, Raisons personnelles, Travail...",
        required=True,
        max_length=500
    )
    date_debut = disnake.ui.TextInput(
        label="Début (JJ/MM/AAAA HH:MM)",
        placeholder="Ex: 15/05/2024 08:00",
        min_length=16,
        max_length=16,
        required=True
    )
    date_fin = disnake.ui.TextInput(
        label="Fin (JJ/MM/AAAA HH:MM)",
        placeholder="Ex: 20/05/2024 18:00",
        min_length=16,
        max_length=16,
        required=True
    )

    async def callback(self, interaction: disnake.ModalInteraction):
        try:
            val_debut = interaction.text_values.get(self.date_debut.custom_id) or self.date_debut.value
            val_fin = interaction.text_values.get(self.date_fin.custom_id) or self.date_fin.value
            
            debut = parse_date(val_debut)
            fin = parse_date(val_fin)
        except (ValueError, TypeError) as e:
            return await interaction.response.send_message(f"❌ Format de date invalide ou manquant. Utilise le format: `{DATE_FORMAT.replace('%d', 'JJ').replace('%m', 'MM').replace('%Y', 'AAAA').replace('%H', 'HH').replace('%M', 'MM')}`", ephemeral=True)

        if debut > fin:
            return await interaction.response.send_message("❌ La date de début doit précéder la date de fin.", ephemeral=True)

        # Vérification si déjà absent
        all_abs = await load_absences()
        guild_abs = get_guild_absences(all_abs, interaction.guild.id)
        
        if str(interaction.user.id) in guild_abs:
            return await interaction.response.send_message("❌ Tu as déjà déclaré une absence sur ce serveur.", ephemeral=True)

        settings = load_settings(interaction.guild.id)
        channel_id = settings.get("absence_channel_id")
        
        if not channel_id:
            return await interaction.response.send_message("❌ Le salon d'absence n'est pas configuré sur ce serveur. Contacte un administrateur.", ephemeral=True)

        channel = interaction.guild.get_channel(int(channel_id))
        if not channel:
            return await interaction.response.send_message("❌ Salon d'absence introuvable. Vérifie la configuration.", ephemeral=True)

        duree_delta = fin - debut
        duree_jours = duree_delta.days
        duree_heures = duree_delta.seconds // 3600
        
        duree_str = f"{duree_jours}j {duree_heures}h" if duree_jours > 0 else f"{duree_heures}h"
        
        now = get_paris_now()
        etat = "à venir" if debut > now else "en cours"

        # Message dans le salon
        absence_message = await channel.send(
            f"# ABSENCE STAFF :\n"
            f"- **Pseudo Discord** : {interaction.user.mention}\n"
            f"- **Durée prévue** : {duree_str}\n"
            f"- **Débute le** : {self.date_debut.value} (Paris)\n"
            f"- **Termine le** : {self.date_fin.value} (Paris)\n"
            f"- **Motif** : {self.motif.value}\n"
            f"- **Mention du supérieur hiérarchique** : {self.superieur.mention if self.superieur else 'Aucun'}"
        )

        # Enregistrement
        guild_abs[str(interaction.user.id)] = {
            "pseudo": interaction.user.name,
            "debut": self.date_debut.value,
            "fin": self.date_fin.value,
            "motif": self.motif.value,
            "superieur": self.superieur.mention if self.superieur else "Aucun",
            "message_id": absence_message.id,
            "etat": etat
        }
        
        all_abs = update_guild_absences(all_abs, interaction.guild.id, guild_abs)
        await save_absences(all_abs)

        # Attribution du rôle si déjà en cours
        if etat == "en cours":
            role_id = settings.get("absence_role_id")
            if role_id:
                role = interaction.guild.get_role(int(role_id))
                if role:
                    try:
                        await interaction.user.add_roles(role, reason="Début d'absence staff")
                    except: pass

        await interaction.response.send_message("✅ Absence enregistrée avec succès !", ephemeral=True)

class AbsenceConfigView(disnake.ui.View):
    def __init__(self, guild_id: int):
        super().__init__(timeout=60)
        self.guild_id = guild_id

    @disnake.ui.button(label="Définir le Salon", style=disnake.ButtonStyle.primary, emoji="📁")
    async def set_channel(self, button: disnake.ui.Button, interaction: disnake.Interaction):
        await interaction.response.send_message("Mentionne le salon ici (ou envoie son ID) :", ephemeral=True)
        
        def check(m):
            return m.author == interaction.user and m.channel == interaction.channel

        try:
            msg = await interaction.bot.wait_for('message', check=check, timeout=30)
            channel = None
            if msg.channel_mentions:
                channel = msg.channel_mentions[0]
            elif msg.content.isdigit():
                channel = interaction.guild.get_channel(int(msg.content))
            
            if not channel:
                return await interaction.followup.send("❌ Salon invalide.", ephemeral=True)

            settings = load_settings(self.guild_id)
            settings["absence_channel_id"] = channel.id
            save_settings(self.guild_id, settings)
            await interaction.followup.send(f"✅ Salon d'absence configuré sur {channel.mention}", ephemeral=True)
            try: await msg.delete()
            except: pass
        except asyncio.TimeoutError:
            await interaction.followup.send("❌ Temps écoulé.", ephemeral=True)

    @disnake.ui.button(label="Définir le Rôle", style=disnake.ButtonStyle.primary, emoji="🎭")
    async def set_role(self, button: disnake.ui.Button, interaction: disnake.Interaction):
        await interaction.response.send_message("Mentionne le rôle ici (ou envoie son ID) :", ephemeral=True)
        
        def check(m):
            return m.author == interaction.user and m.channel == interaction.channel

        try:
            msg = await interaction.bot.wait_for('message', check=check, timeout=30)
            role = None
            if msg.role_mentions:
                role = msg.role_mentions[0]
            elif msg.content.isdigit():
                role = interaction.guild.get_role(int(msg.content))
            
            if not role:
                return await interaction.followup.send("❌ Rôle invalide.", ephemeral=True)

            settings = load_settings(self.guild_id)
            settings["absence_role_id"] = role.id
            save_settings(self.guild_id, settings)
            await interaction.followup.send(f"✅ Rôle d'absence configuré sur **{role.name}**", ephemeral=True)
            try: await msg.delete()
            except: pass
        except asyncio.TimeoutError:
            await interaction.followup.send("❌ Temps écoulé.", ephemeral=True)

class Absence(commands.Cog):
    def __init__(self, bot):
        self.bot = bot
        self.check_absences.start()

    @commands.slash_command(name="absence", description="Déclarer une absence staff")
    async def absence(self, interaction: disnake.ApplicationCommandInteraction, 
                      superieur: Optional[disnake.Member] = commands.Param(None, description="Le supérieur hiérarchique à prévenir")):
        """Déclare une absence via un formulaire"""
        await interaction.response.send_modal(AbsenceModal(superieur))

    @commands.slash_command(name="absence_config", description="Configurer le système d'absence (Admin)")
    @commands.has_permissions(administrator=True)
    async def absence_config(self, interaction: disnake.ApplicationCommandInteraction):
        """Ouvre le panneau de configuration des absences"""
        settings = load_settings(interaction.guild.id)
        
        embed = disnake.Embed(
            title="⚙️ Configuration des Absences Staff",
            description="Utilisez les boutons ci-dessous pour configurer le système.",
            color=disnake.Color.blue()
        )
        
        channel_id = settings.get("absence_channel_id")
        role_id = settings.get("absence_role_id")
        
        embed.add_field(
            name="📁 Salon d'affichage",
            value=f"<#{channel_id}>" if channel_id else "❌ Non configuré",
            inline=True
        )
        embed.add_field(
            name="🎭 Rôle d'absence",
            value=f"<@&{role_id}>" if role_id else "❌ Non configuré",
            inline=True
        )
        
        await interaction.response.send_message(embed=embed, view=AbsenceConfigView(interaction.guild.id), ephemeral=True)

    async def strike_absence_message(self, guild: disnake.Guild, channel_id: int, message_id: int):
        """Modifie le message d'absence pour le barrer au lieu de le supprimer"""
        channel = guild.get_channel(channel_id)
        if not channel:
            try:
                channel = await guild.fetch_channel(channel_id)
            except:
                return
        
        try:
            msg = await channel.fetch_message(message_id)
            content = msg.content
            
            if "~~" in content: # Déjà barré
                return
                
            lines = content.split("\n")
            new_lines = []
            for line in lines:
                if line.startswith("# "):
                    # Conserver le style header mais barrer le texte
                    new_lines.append(f"# ~~{line[2:].strip()}~~ [TERMINÉ]")
                elif line.strip():
                    new_lines.append(f"~~{line}~~")
                else:
                    new_lines.append(line)
            
            await msg.edit(content="\n".join(new_lines))
        except Exception as e:
            print(f"Erreur lors du barrage du message d'absence: {e}")

    @commands.slash_command(name="fin_absence", description="Terminer son absence staff")
    async def fin_absence(self, interaction: disnake.ApplicationCommandInteraction):
        """Met fin à l'absence en cours"""
        all_abs = await load_absences()
        guild_abs = get_guild_absences(all_abs, interaction.guild.id)
        user_id = str(interaction.user.id)

        if user_id not in guild_abs:
            return await interaction.response.send_message("❌ Tu n'as pas d'absence enregistrée sur ce serveur.", ephemeral=True)

        info = guild_abs[user_id]
        message_id = info.get("message_id")
        
        settings = load_settings(interaction.guild.id)
        channel_id = settings.get("absence_channel_id")
        
        if channel_id and message_id:
            await self.strike_absence_message(interaction.guild, int(channel_id), int(message_id))

        # Retrait du rôle
        role_id = settings.get("absence_role_id")
        if role_id:
            role = interaction.guild.get_role(int(role_id))
            if role:
                try: await interaction.user.remove_roles(role, reason="Fin d'absence staff")
                except: pass

        del guild_abs[user_id]
        all_abs = update_guild_absences(all_abs, interaction.guild.id, guild_abs)
        await save_absences(all_abs)
        await interaction.response.send_message("✅ Ton absence a été retirée.", ephemeral=True)

    @commands.slash_command(name="liste_absences", description="Afficher la liste des absences staff en cours")
    async def liste_absences(self, interaction: disnake.ApplicationCommandInteraction):
        """Affiche les absences en cours sur le serveur"""
        all_abs = await load_absences()
        guild_abs = get_guild_absences(all_abs, interaction.guild.id)
        
        absences = [
            (user_id, info) for user_id, info in guild_abs.items()
            if info.get("etat") == "en cours"
        ]

        if not absences:
            return await interaction.response.send_message("Aucune absence staff en cours sur ce serveur.", ephemeral=True)

        per_page = 5
        pages = [absences[i:i + per_page] for i in range(0, len(absences), per_page)]

        def create_embed(page_index: int) -> disnake.Embed:
            embed = disnake.Embed(
                title=f"📋 Absences staff - {interaction.guild.name} ({page_index + 1}/{len(pages)})",
                color=disnake.Color.orange()
            )
            for user_id, info in pages[page_index]:
                embed.add_field(
                    name=info["pseudo"],
                    value=(
                        f"**Période** : du {info['debut']} au {info['fin']}\n"
                        f"**Motif** : {info['motif']}\n"
                        f"**Supérieur** : {info['superieur']}"
                    ),
                    inline=False
                )
            embed.set_footer(text="Gestion des absences du staff")
            return embed

        class PaginatorView(disnake.ui.View):
            def __init__(self):
                super().__init__(timeout=60)
                self.page = 0

            @disnake.ui.button(label="⬅️ Précédent", style=disnake.ButtonStyle.secondary, disabled=True)
            async def previous(self, interaction_btn: disnake.Interaction, button: disnake.ui.Button):
                self.page -= 1
                self.update_buttons()
                await interaction_btn.response.edit_message(embed=create_embed(self.page), view=self)

            @disnake.ui.button(label="➡️ Suivant", style=disnake.ButtonStyle.secondary, disabled=len(pages) == 1)
            async def next(self, interaction_btn: disnake.Interaction, button: disnake.ui.Button):
                self.page += 1
                self.update_buttons()
                await interaction_btn.response.edit_message(embed=create_embed(self.page), view=self)

            def update_buttons(self):
                self.children[0].disabled = self.page == 0
                self.children[1].disabled = self.page >= len(pages) - 1

        await interaction.response.send_message(embed=create_embed(0), view=PaginatorView(), ephemeral=True)

    @tasks.loop(minutes=1)
    async def check_absences(self):
        all_abs = await load_absences()
        now = get_paris_now()
        changed = False

        for guild_id_str, guild_data in list(all_abs.items()):
            guild_id = int(guild_id_str)
            guild = self.bot.get_guild(guild_id)
            if not guild:
                try:
                    guild = await self.bot.fetch_guild(guild_id)
                except:
                    continue

            settings = load_settings(guild_id)
            role_id = settings.get("absence_role_id")
            role = guild.get_role(int(role_id)) if role_id else None
            
            to_remove = []
            for user_id_str, info in guild_data.items():
                try:
                    debut = parse_date(info["debut"])
                    fin = parse_date(info["fin"])
                except Exception as e:
                    print(f"Erreur parsing date pour {user_id_str}: {e}")
                    continue
                
                user_id = int(user_id_str)
                member = guild.get_member(user_id)
                if not member:
                    try:
                        member = await guild.fetch_member(user_id)
                    except:
                        pass
                
                etat = info.get("etat", "en cours")

                # Activation si l'heure est arrivée
                if etat == "à venir" and debut <= now:
                    print(f"Activation absence pour {info['pseudo']} ({user_id_str})")
                    info["etat"] = "en cours"
                    changed = True
                    if member and role:
                        try:
                            await member.add_roles(role, reason="Début d'absence staff")
                        except Exception as e:
                            print(f"Erreur ajout rôle absence: {e}")

                # Désactivation si l'heure est passée
                if fin < now:
                    print(f"Désactivation absence pour {info['pseudo']} ({user_id_str})")
                    if member and role:
                        try:
                            await member.remove_roles(role, reason="Fin d'absence staff")
                        except Exception as e:
                            print(f"Erreur retrait rôle absence: {e}")
                    
                    # On barre aussi le message en automatique
                    message_id = info.get("message_id")
                    channel_id = settings.get("absence_channel_id")
                    if channel_id and message_id:
                        await self.strike_absence_message(guild, int(channel_id), int(message_id))
                        
                    to_remove.append(user_id_str)
                    changed = True

            for uid in to_remove:
                guild_data.pop(uid, None)

        if changed:
            await save_absences(all_abs)

    @commands.Cog.listener()
    async def on_message(self, message):
        if message.author.bot or not message.guild:
            return

        all_abs = await load_absences()
        guild_abs = get_guild_absences(all_abs, message.guild.id)
        
        # 1. Rappel à l'auteur s'il est absent
        if str(message.author.id) in guild_abs:
            if guild_abs[str(message.author.id)].get("etat") == "en cours":
                await message.channel.send(
                    f"{message.author.mention}, tu es actuellement déclaré absent sur ce serveur. Merci de prévenir si tu es de retour !",
                    delete_after=10
                )

        # 2. Notification des mentions de staff absents
        for user_id_str, info in guild_abs.items():
            if info.get("etat") != "en cours":
                continue
                
            if f"<@{user_id_str}>" in message.content or f"<@!{user_id_str}>" in message.content:
                msg_id = info.get("message_id")
                settings = load_settings(message.guild.id)
                channel_id = settings.get("absence_channel_id")
                
                absence_url = f"https://disnake.com/channels/{message.guild.id}/{channel_id}/{msg_id}" if channel_id and msg_id else ""
                
                reply_text = f"⚠️ {message.author.mention}, cet utilisateur est actuellement absent."
                if absence_url:
                    reply_text += f"\nPlus d'infos ici : [Voir la déclaration]({absence_url})"
                
                await message.reply(reply_text, delete_after=30)

def setup(bot):
    bot.add_cog(Absence(bot))