"""TSSBOT slash commands.

TSSBOT's first slash commands, mirroring SREBOT's resolve + autocomplete UX:

* ``/set-team``     — set this server's team (writes TEAMS.json)
* ``/log-team``     — subscribe a team's matches to this channel (autolog)
* ``/log-player``   — subscribe a player's matches to this channel (autolog)
* ``/set-player``   — link your Discord account to a WT player (shared PLAYERS.json)
* ``/player-stats`` — TSS career stats for a player (defaults to your linked account)

Config commands (set/log) require Manage Server. All commands honor the shared
discord-user blacklist.
"""
from __future__ import annotations

import json
import logging
import time
from pathlib import Path
from typing import List

import discord
from discord import app_commands
from discord.ext import commands

from . import preferences, storage
from shared_store import check_user_blacklist, get_linked_uid, save_player_link

log = logging.getLogger("tssbot.commands")

FOOTER = "ᓚᘏᗢ"

_NEWS_JSON = Path(__file__).resolve().parent / "NEWS.json"


# ---------------------------------------------------------------------------
# Checks
# ---------------------------------------------------------------------------

def not_blacklisted():
    """App-command check rejecting blacklisted Discord users (shared BLACKLIST.json)."""
    async def predicate(interaction: discord.Interaction) -> bool:
        blocked, reason = check_user_blacklist(interaction.user.id)
        if blocked:
            raise app_commands.CheckFailure(reason or "You are blacklisted from using this bot.")
        return True
    return app_commands.check(predicate)


# ---------------------------------------------------------------------------
# Autocomplete
# ---------------------------------------------------------------------------

async def team_autocomplete(interaction: discord.Interaction, current: str) -> List[app_commands.Choice[str]]:
    try:
        rows = await storage.search_teams(current, 25)
    except Exception:
        return []
    choices = []
    for r in rows:
        label = (r.get("long_name") or str(r["team_id"]))[:100]
        choices.append(app_commands.Choice(name=label, value=str(r["team_id"])))
    return choices


async def player_autocomplete(interaction: discord.Interaction, current: str) -> List[app_commands.Choice[str]]:
    try:
        rows = await storage.search_players(current, 25)
    except Exception:
        return []
    return [app_commands.Choice(name=r["nick"][:100], value=r["nick"][:100]) for r in rows]


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _too_many_msg(candidates: List[dict]) -> str:
    preview = ", ".join(f"`{c['nick']}`" for c in candidates[:10])
    return (
        "Multiple players match — pick a more specific name (use the autocomplete):\n"
        f"{preview}"
    )


# ---------------------------------------------------------------------------
# Cog
# ---------------------------------------------------------------------------

class TssCommands(commands.Cog):
    """Container for TSSBOT's application commands."""

    def __init__(self, bot: commands.Bot):
        self.bot = bot

    async def cog_app_command_error(self, interaction: discord.Interaction, error: app_commands.AppCommandError):
        if isinstance(error, app_commands.CheckFailure):
            msg = str(error) or "You can't use this command."
            if interaction.response.is_done():
                await interaction.followup.send(msg, ephemeral=True)
            else:
                await interaction.response.send_message(msg, ephemeral=True)
            return
        log.error("app command error: %s", error)
        try:
            if interaction.response.is_done():
                await interaction.followup.send(f"Something went wrong: {error}", ephemeral=True)
            else:
                await interaction.response.send_message(f"Something went wrong: {error}", ephemeral=True)
        except discord.HTTPException:
            pass

    # ── /set-team ──────────────────────────────────────────────────────────
    @app_commands.command(name="set-team", description="Set this server's team")
    @app_commands.describe(team="TSS team name or ID")
    @app_commands.autocomplete(team=team_autocomplete)
    @app_commands.checks.has_permissions(manage_guild=True)
    @not_blacklisted()
    async def set_team(self, interaction: discord.Interaction, team: str):
        await interaction.response.defer(ephemeral=True)
        if interaction.guild_id is None:
            return await interaction.followup.send("This command must be used in a server.", ephemeral=True)
        resolved = await storage.resolve_team(team)
        if not resolved:
            return await interaction.followup.send(f"Could not find a team matching **{team}**.", ephemeral=True)
        name = resolved.get("long_name") or str(resolved["team_id"])
        preferences.set_guild_team(interaction.guild_id, int(resolved["team_id"]), name)
        await interaction.followup.send(
            f"✅ This server's team is now **{name}** (id `{resolved['team_id']}`).", ephemeral=True
        )

    # ── /log-team ──────────────────────────────────────────────────────────
    @app_commands.command(name="log-team", description="Send a team's matches to this channel")
    @app_commands.describe(team="TSS team name or ID")
    @app_commands.autocomplete(team=team_autocomplete)
    @app_commands.checks.has_permissions(manage_guild=True)
    @not_blacklisted()
    async def log_team(self, interaction: discord.Interaction, team: str):
        await interaction.response.defer(ephemeral=True)
        if interaction.guild_id is None or interaction.channel_id is None:
            return await interaction.followup.send("This command must be used in a server channel.", ephemeral=True)
        resolved = await storage.resolve_team(team)
        if not resolved:
            return await interaction.followup.send(f"Could not find a team matching **{team}**.", ephemeral=True)
        name = resolved.get("long_name") or str(resolved["team_id"])
        preferences.upsert_log_entry(
            interaction.guild_id, int(resolved["team_id"]), "tss-team", name, interaction.channel_id
        )
        await interaction.followup.send(
            f"✅ Logging **{name}**'s matches to <#{interaction.channel_id}>.", ephemeral=True
        )

    # ── /set-player ────────────────────────────────────────────────────────
    @app_commands.command(name="set-player", description="Link your Discord account to a War Thunder player")
    @app_commands.describe(player="Player username")
    @app_commands.autocomplete(player=player_autocomplete)
    @not_blacklisted()
    async def set_player(self, interaction: discord.Interaction, player: str):
        await interaction.response.defer(ephemeral=True)
        candidates = await storage.resolve_players(player)
        if not candidates:
            return await interaction.followup.send(f"No players found matching **{player}**.", ephemeral=True)
        if len(candidates) > 1:
            return await interaction.followup.send(_too_many_msg(candidates), ephemeral=True)
        uid, nick = str(candidates[0]["uid"]), candidates[0]["nick"]
        save_player_link(interaction.user.id, uid)
        await interaction.followup.send(
            f"✅ Linked your Discord account to **{nick}** (UID `{uid}`).\n"
            "`/player-stats` with no argument will now default to this account.",
            ephemeral=True,
        )

    # ── /player-stats ──────────────────────────────────────────────────────
    @app_commands.command(name="player-stats", description="View TSS career stats for a player")
    @app_commands.describe(player="Player username (defaults to your linked account)")
    @app_commands.autocomplete(player=player_autocomplete)
    @not_blacklisted()
    async def player_stats(self, interaction: discord.Interaction, player: str = ""):
        await interaction.response.defer()
        if player:
            candidates = await storage.resolve_players(player)
            if not candidates:
                return await interaction.followup.send(f"No players found matching **{player}**.", ephemeral=True)
            if len(candidates) > 1:
                return await interaction.followup.send(_too_many_msg(candidates), ephemeral=True)
            uid = str(candidates[0]["uid"])
        else:
            uid = get_linked_uid(interaction.user.id) or ""
            if not uid:
                return await interaction.followup.send(
                    "Provide a player, or link your account first with `/set-player`.", ephemeral=True
                )

        career = await storage.player_career(uid)
        if not career:
            return await interaction.followup.send("No TSS games on record for that player.", ephemeral=True)

        teams = await storage.player_teams(uid)
        battles = career.get("battles") or 0
        wins = career.get("wins") or 0
        losses = career.get("losses") or 0
        win_rate = f"{(wins / battles * 100):.1f}%" if battles else "0.0%"
        deaths = career.get("deaths") or 0
        kills = (career.get("ground_kills") or 0) + (career.get("air_kills") or 0)
        kd = f"{(kills / deaths):.2f}" if deaths else f"{kills}"

        embed = discord.Embed(
            title=f"{career['nick']} — TSS career",
            color=discord.Color.orange(),
        )
        embed.add_field(name="Battles", value=str(battles), inline=True)
        embed.add_field(name="Win rate", value=f"{win_rate} ({wins}W / {losses}L)", inline=True)
        embed.add_field(name="K/D", value=f"{kd} ({kills} kills / {deaths} deaths)", inline=True)
        embed.add_field(
            name="Ground / Air kills",
            value=f"{career.get('ground_kills') or 0} / {career.get('air_kills') or 0}",
            inline=True,
        )
        embed.add_field(name="Assists", value=str(career.get("assists") or 0), inline=True)
        embed.add_field(name="Captures", value=str(career.get("captures") or 0), inline=True)
        if teams:
            top = teams[:5]
            embed.add_field(
                name="Teams seen with",
                value="\n".join(
                    f"`{(tm.get('team_name') or '?')}` — {tm.get('games') or 0} games" for tm in top
                ),
                inline=False,
            )
        embed.set_footer(text=FOOTER)
        await interaction.followup.send(embed=embed)

    # ── /news ──────────────────────────────────────────────────────────────
    @app_commands.command(name="news", description="View the latest TSSBOT news and announcements")
    @not_blacklisted()
    async def news(self, interaction: discord.Interaction):
        await interaction.response.defer()
        all_entries = []
        if _NEWS_JSON.exists():
            try:
                with open(_NEWS_JSON, "r", encoding="utf-8") as f:
                    all_entries = json.load(f)
            except (json.JSONDecodeError, OSError):
                all_entries = []
        now_ts = int(time.time())
        entries = [
            e for e in all_entries
            if isinstance(e, dict) and now_ts < e.get("expires", float("inf"))
        ]
        if not entries:
            await interaction.followup.send(
                embed=discord.Embed(
                    title="No news",
                    description="There are no announcements right now.",
                    color=discord.Color.orange(),
                ),
                ephemeral=True,
            )
            return
        embeds = [
            discord.Embed(
                title=item.get("title", "Announcement"),
                description=item.get("body", ""),
                color=discord.Color.orange(),
            )
            for item in entries[:10]
        ]
        embeds[-1].set_footer(text=FOOTER)
        await interaction.followup.send(embeds=embeds)

    # ── /help ──────────────────────────────────────────────────────────────
    @app_commands.command(name="help", description="List TSSBOT commands and what they do")
    @not_blacklisted()
    async def help_cmd(self, interaction: discord.Interaction):
        embed = discord.Embed(
            title="TSSBOT commands",
            description="Live TSS team & player stats, plus match autologging.",
            color=discord.Color.orange(),
        )
        embed.add_field(
            name="Stats",
            value=(
                "`/player-stats [player]` — TSS career stats for a player "
                "(defaults to your linked account)\n"
                "`/set-player <player>` — link your Discord account to a WT player"
            ),
            inline=False,
        )
        embed.add_field(
            name="Autologging — Manage Server",
            value=(
                "`/set-team <team>` — set this server's team\n"
                "`/log-team <team>` — post a team's matches to this channel"
            ),
            inline=False,
        )
        embed.add_field(
            name="Info",
            value="`/news` — latest announcements\n`/help` — this message",
            inline=False,
        )
        embed.set_footer(text=FOOTER)
        await interaction.response.send_message(embed=embed)


async def setup_commands(bot: commands.Bot) -> None:
    """Register the TSS command cog on the bot."""
    await bot.add_cog(TssCommands(bot))