"""
Refractor cog — /refractor status slash command.

Displays a team's refractor progress: formula value vs next threshold
with a progress bar, paginated 10 cards per page.

Depends on WP-07 (evolution/cards API endpoint).
"""

import logging
from typing import Optional

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

from api_calls import db_get
from helpers.main import get_team_by_owner

logger = logging.getLogger("discord_app")

PAGE_SIZE = 10

TIER_NAMES = {
    0: "Base Chrome",
    1: "Refractor",
    2: "Gold Refractor",
    3: "Superfractor",
    4: "Superfractor",
}

FORMULA_LABELS = {
    "batter": "PA+TB×2",
    "sp": "IP+K",
    "rp": "IP+K",
}


def render_progress_bar(current: int, threshold: int, width: int = 10) -> str:
    """
    Render a fixed-width ASCII progress bar.

    Examples:
        render_progress_bar(120, 149) -> '[========--]'
        render_progress_bar(0, 100)   -> '[----------]'
        render_progress_bar(100, 100) -> '[==========]'
    """
    if threshold <= 0:
        filled = width
    else:
        ratio = min(current / threshold, 1.0)
        filled = round(ratio * width)
    empty = width - filled
    return f"[{'=' * filled}{'-' * empty}]"


def format_refractor_entry(card_state: dict) -> str:
    """
    Format a single card state dict as a display string.

    Expected keys: player_name, card_type, current_tier, formula_value,
    next_threshold (None if fully evolved).

    Output example:
        **Mike Trout** (Refractor)
        [========--] 120/149 (PA+TB×2) — T1 → T2
    """
    player_name = card_state.get("player_name", "Unknown")
    card_type = card_state.get("card_type", "batter")
    current_tier = card_state.get("current_tier", 0)
    formula_value = card_state.get("formula_value", 0)
    next_threshold = card_state.get("next_threshold")

    tier_label = TIER_NAMES.get(current_tier, f"T{current_tier}")
    formula_label = FORMULA_LABELS.get(card_type, card_type)

    if current_tier >= 4 or next_threshold is None:
        bar = "[==========]"
        detail = "FULLY EVOLVED ★"
    else:
        bar = render_progress_bar(formula_value, next_threshold)
        detail = f"{formula_value}/{next_threshold} ({formula_label}) — T{current_tier} → T{current_tier + 1}"

    first_line = f"**{player_name}** ({tier_label})"
    second_line = f"{bar} {detail}"
    return f"{first_line}\n{second_line}"


def apply_close_filter(card_states: list) -> list:
    """
    Return only cards within 80% of their next tier threshold.

    Fully evolved cards (T4 or no next_threshold) are excluded.
    """
    result = []
    for state in card_states:
        current_tier = state.get("current_tier", 0)
        formula_value = state.get("formula_value", 0)
        next_threshold = state.get("next_threshold")
        if current_tier >= 4 or not next_threshold:
            continue
        if formula_value >= 0.8 * next_threshold:
            result.append(state)
    return result


def paginate(items: list, page: int, page_size: int = PAGE_SIZE) -> tuple:
    """
    Slice items for the given 1-indexed page.

    Returns (page_items, total_pages). Page is clamped to valid range.
    """
    total_pages = max(1, (len(items) + page_size - 1) // page_size)
    page = max(1, min(page, total_pages))
    start = (page - 1) * page_size
    return items[start : start + page_size], total_pages


class Refractor(commands.Cog):
    """Refractor progress tracking slash commands."""

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

    refractor_group = app_commands.Group(
        name="refractor", description="Refractor tracking commands"
    )

    @refractor_group.command(
        name="status", description="Show your team's refractor progress"
    )
    @app_commands.describe(
        card_type="Card type filter (batter, sp, rp)",
        season="Season number (default: current)",
        tier="Filter by current tier (0-4)",
        progress='Use "close" to show cards within 80% of their next tier',
        page="Page number (default: 1, 10 cards per page)",
    )
    async def refractor_status(
        self,
        interaction: discord.Interaction,
        card_type: Optional[str] = None,
        season: Optional[int] = None,
        tier: Optional[int] = None,
        progress: Optional[str] = None,
        page: int = 1,
    ):
        """Show a paginated view of the invoking user's team refractor progress."""
        await interaction.response.defer(ephemeral=True)

        team = await get_team_by_owner(interaction.user.id)
        if not team:
            await interaction.edit_original_response(
                content="You don't have a team. Sign up with /newteam first."
            )
            return

        params = [("team_id", team["id"])]
        if card_type:
            params.append(("card_type", card_type))
        if season is not None:
            params.append(("season", season))
        if tier is not None:
            params.append(("tier", tier))

        data = await db_get("evolution/cards", params=params)
        if not data:
            await interaction.edit_original_response(
                content="No refractor data found for your team."
            )
            return

        items = data if isinstance(data, list) else data.get("cards", [])
        if not items:
            await interaction.edit_original_response(
                content="No refractor data found for your team."
            )
            return

        if progress == "close":
            items = apply_close_filter(items)
            if not items:
                await interaction.edit_original_response(
                    content="No cards are currently close to a tier advancement."
                )
                return

        page_items, total_pages = paginate(items, page)
        lines = [format_refractor_entry(state) for state in page_items]

        embed = discord.Embed(
            title=f"{team['sname']} Refractor Status",
            description="\n\n".join(lines),
            color=0x6F42C1,
        )
        embed.set_footer(text=f"Page {page}/{total_pages} · {len(items)} card(s) total")

        await interaction.edit_original_response(embed=embed)


async def setup(bot):
    await bot.add_cog(Refractor(bot))