"""
routes/deckbuilder.py
=====================
Deck builder endpoints:
  POST   /api/decks
  GET    /api/decks
  GET    /api/decks/{deck_id}
  PUT    /api/decks/{deck_id}
  DELETE /api/decks/{deck_id}
  DELETE /api/decks
  GET    /api/decks/{deck_id}/cards
  POST   /api/decks/{deck_id}/cards
  DELETE /api/decks/{deck_id}/cards/{card_id}
  PATCH  /api/decks/{deck_id}/cards/{card_id}
  GET    /api/decks/{deck_id}/analysis
  GET    /api/decks/{deck_id}/recommended-from-collection
  GET    /api/decks/{deck_id}/edh-recs
  POST   /api/decks/{deck_id}/bulk-add
  POST   /api/decks/{deck_id}/bulk-add-recommended
  POST   /api/decks/{deck_id}/export-to-sim
  POST   /api/decks/{deck_id}/import
  POST   /api/decks/import-new
"""
from __future__ import annotations

import json
import os
import re
import time
from datetime import datetime
from pathlib import Path
from typing import Optional
from urllib.request import urlopen, Request
from urllib.parse import quote

from fastapi import APIRouter, HTTPException, Request as FastAPIRequest
from fastapi.responses import JSONResponse

from models.state import CFG
from models.requests import (
    CreateDeckRequest, UpdateDeckRequest, AddDeckCardRequest,
    PatchDeckCardRequest, BulkAddRequest, BulkAddRecommendedRequest,
)
from services.card_analysis import _detect_card_roles
from services.database import _get_db_conn, _row_to_dict, _add_image_url
from services.deck_service import (
    _get_deck_or_404, _compute_deck_analysis, _check_ratio_limit,
    _classify_card_type, _classify_card_category, _to_edhrec_slug, _TYPE_TARGETS,
    _save_profile_to_dck,
)
from services.import_helpers import (
    _fetch_edhrec_average, _parse_text_decklist,
    _edhrec_cache_get, _edhrec_cache_set,
)
from services.logging import log_collect, log_deckgen
from services.scryfall import (
    _API_HEADERS, _enrich_from_scryfall, _fetch_scryfall_api, _scryfall_rate_limit,
)

router = APIRouter(tags=["deckbuilder"])


@router.post("/api/decks")
async def create_deck(req: CreateDeckRequest):
    """Create a new deck."""
    conn = _get_db_conn()
    color_identity_json = json.dumps(req.color_identity or [])
    cur = conn.execute(
        """
        INSERT INTO decks (name, commander_scryfall_id, commander_name, color_identity, strategy_tag)
        VALUES (?, ?, ?, ?, ?)
        """,
        (
            req.name,
            req.commander_scryfall_id or "",
            req.commander_name or "",
            color_identity_json,
            req.strategy_tag or "",
        )
    )
    conn.commit()
    deck_id = cur.lastrowid
    return _get_deck_or_404(deck_id)


@router.get("/api/decks")
async def list_decks_db():
    """List all decks with card counts."""
    conn = _get_db_conn()
    rows = conn.execute(
        """
        SELECT d.*,
               COALESCE(SUM(dc.quantity), 0) AS total_cards,
               COUNT(dc.id) AS card_slots
        FROM decks d
        LEFT JOIN deck_cards dc ON dc.deck_id = d.id
        GROUP BY d.id
        ORDER BY d.updated_at DESC
        """
    ).fetchall()
    decks = []
    for row in rows:
        d = dict(row)
        try:
            d["color_identity"] = json.loads(d.get("color_identity", "[]"))
        except Exception:
            d["color_identity"] = []
        decks.append(d)
    return {"decks": decks}


@router.get("/api/decks/{deck_id}")
async def get_deck(deck_id: int):
    """Get full deck info with composition summary."""
    deck = _get_deck_or_404(deck_id)
    conn = _get_db_conn()
    card_rows = conn.execute(
        "SELECT * FROM deck_cards WHERE deck_id = ? ORDER BY is_commander DESC, card_name ASC",
        (deck_id,)
    ).fetchall()
    deck["cards"] = [dict(r) for r in card_rows]
    deck["total_cards"] = sum(r["quantity"] for r in card_rows)
    deck["card_slots"] = len(card_rows)
    analysis = _compute_deck_analysis(deck_id)
    deck["composition"] = analysis["counts_by_type"]
    return deck


@router.put("/api/decks/{deck_id}")
async def update_deck(deck_id: int, req: UpdateDeckRequest):
    """Update deck metadata."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()

    updates = {}
    if req.name is not None:
        updates["name"] = req.name
    if req.commander_scryfall_id is not None:
        updates["commander_scryfall_id"] = req.commander_scryfall_id
    if req.commander_name is not None:
        updates["commander_name"] = req.commander_name
    if req.color_identity is not None:
        updates["color_identity"] = json.dumps(req.color_identity)
    if req.strategy_tag is not None:
        updates["strategy_tag"] = req.strategy_tag

    if not updates:
        return _get_deck_or_404(deck_id)

    updates["updated_at"] = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")
    set_clause = ", ".join(f"{k} = ?" for k in updates)
    conn.execute(f"UPDATE decks SET {set_clause} WHERE id = ?", list(updates.values()) + [deck_id])
    conn.commit()
    return _get_deck_or_404(deck_id)


@router.delete("/api/decks/{deck_id}")
async def delete_deck(deck_id: int):
    """Delete a deck and all its cards (cascade)."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()
    conn.execute("DELETE FROM deck_cards WHERE deck_id = ?", (deck_id,))
    conn.execute("DELETE FROM decks WHERE id = ?", (deck_id,))
    conn.commit()
    return {"deleted": True, "deck_id": deck_id}


@router.delete("/api/decks")
async def delete_all_decks():
    """Delete ALL decks and their cards."""
    conn = _get_db_conn()
    conn.execute("DELETE FROM deck_cards")
    count = conn.execute("SELECT COUNT(*) FROM decks").fetchone()[0]
    conn.execute("DELETE FROM decks")
    conn.commit()
    return {"deleted": True, "count": count}


# ── 2.2 Deck Card Manipulation ───────────────────────────────

@router.get("/api/decks/{deck_id}/cards")
async def get_deck_cards(deck_id: int):
    """Get all cards in a deck with joined collection and card_records data."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()
    rows = conn.execute(
        """
        SELECT
            dc.id, dc.deck_id, dc.scryfall_id, dc.card_name, dc.quantity,
            dc.is_commander, dc.role_tag,
            COALESCE(ce.type_line, cr.type_line, '') as type_line,
            COALESCE(ce.cmc, cr.cmc, 0) as cmc,
            COALESCE(ce.mana_cost, '') as mana_cost,
            COALESCE(ce.color_identity, cr.color_identity, '[]') as color_identity,
            COALESCE(ce.oracle_text, cr.oracle_text, '') as oracle_text,
            COALESCE(ce.keywords, cr.keywords, '[]') as keywords,
            ce.tcg_price, ce.quantity AS owned_qty, ce.is_legendary,
            ce.salt_score, ce.is_game_changer
        FROM deck_cards dc
        LEFT JOIN (
            SELECT scryfall_id, type_line, cmc, mana_cost, color_identity,
                   oracle_text, keywords, tcg_price, quantity, is_legendary,
                   salt_score, is_game_changer
            FROM collection_entries
            GROUP BY scryfall_id
        ) ce ON ce.scryfall_id = dc.scryfall_id
        LEFT JOIN (
            SELECT name, type_line, cmc, color_identity, oracle_text, keywords
            FROM card_records
            GROUP BY name
        ) cr ON cr.name = dc.card_name
        WHERE dc.deck_id = ?
        ORDER BY dc.is_commander DESC, dc.card_name ASC
        """,
        (deck_id,)
    ).fetchall()
    cards = []
    for row in rows:
        d = dict(row)
        for f in ("color_identity", "keywords"):
            if isinstance(d.get(f), str):
                try:
                    d[f] = json.loads(d[f])
                except Exception:
                    d[f] = []
        d["image_url"] = (
            f"https://api.scryfall.com/cards/{d['scryfall_id']}?format=image&version=normal"
            if d.get("scryfall_id") else None
        )
        d["card_type"] = _classify_card_type(d.get("type_line", ""))
        d["card_category"] = _classify_card_category(d.get("type_line", ""), d.get("oracle_text", ""))
        cards.append(d)
    return {"cards": cards, "total": len(cards)}


@router.post("/api/decks/{deck_id}/cards")
async def add_deck_card(deck_id: int, req: AddDeckCardRequest):
    """Add or update a card in the deck."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()

    ce_row = conn.execute(
        "SELECT name FROM collection_entries WHERE scryfall_id = ? LIMIT 1",
        (req.scryfall_id,)
    ).fetchone()
    card_name = ce_row["name"] if ce_row else (req.card_name or "")

    # Ensure card_records has type_line for this card (Scryfall lookup if missing)
    if card_name:
        existing_cr = conn.execute(
            "SELECT type_line FROM card_records WHERE name = ? LIMIT 1", (card_name,)
        ).fetchone()
        if not existing_cr or not existing_cr["type_line"]:
            enriched = _enrich_from_scryfall(card_name)
            if enriched and enriched.get("type_line"):
                conn.execute(
                    "INSERT OR IGNORE INTO card_records (name, type_line, oracle_text, cmc) VALUES (?,?,?,?)",
                    (card_name, enriched["type_line"], enriched.get("oracle_text", ""), enriched.get("cmc", 0))
                )
                conn.commit()

    existing = conn.execute(
        "SELECT id, quantity FROM deck_cards WHERE deck_id = ? AND scryfall_id = ?",
        (deck_id, req.scryfall_id)
    ).fetchone()

    if existing:
        new_qty = existing["quantity"] + (req.quantity or 1)
        conn.execute(
            "UPDATE deck_cards SET quantity = ?, role_tag = ?, is_commander = ? WHERE id = ?",
            (new_qty, req.role_tag or "", req.is_commander or 0, existing["id"])
        )
        conn.commit()
        row = conn.execute("SELECT * FROM deck_cards WHERE id = ?", (existing["id"],)).fetchone()
    else:
        cur = conn.execute(
            """
            INSERT INTO deck_cards (deck_id, scryfall_id, card_name, quantity, is_commander, role_tag)
            VALUES (?, ?, ?, ?, ?, ?)
            """,
            (
                deck_id, req.scryfall_id, card_name,
                req.quantity or 1,
                req.is_commander or 0,
                req.role_tag or ""
            )
        )
        conn.commit()
        row = conn.execute("SELECT * FROM deck_cards WHERE id = ?", (cur.lastrowid,)).fetchone()

    conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
    conn.commit()
    return dict(row)


@router.delete("/api/decks/{deck_id}/cards/{card_id}")
async def remove_deck_card(deck_id: int, card_id: int):
    """Remove a card from a deck."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()
    row = conn.execute(
        "SELECT id FROM deck_cards WHERE id = ? AND deck_id = ?", (card_id, deck_id)
    ).fetchone()
    if not row:
        raise HTTPException(404, f"Card slot {card_id} not found in deck {deck_id}")
    conn.execute("DELETE FROM deck_cards WHERE id = ?", (card_id,))
    conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
    conn.commit()
    return {"deleted": True, "card_id": card_id, "deck_id": deck_id}


@router.patch("/api/decks/{deck_id}/cards/{card_id}")
async def patch_deck_card(deck_id: int, card_id: int, req: PatchDeckCardRequest):
    """Update quantity or role_tag for a card in a deck."""
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()
    row = conn.execute(
        "SELECT * FROM deck_cards WHERE id = ? AND deck_id = ?", (card_id, deck_id)
    ).fetchone()
    if not row:
        raise HTTPException(404, f"Card slot {card_id} not found in deck {deck_id}")

    updates = {}
    if req.quantity is not None:
        if req.quantity < 1:
            raise HTTPException(400, "quantity must be >= 1")
        updates["quantity"] = req.quantity
    if req.role_tag is not None:
        updates["role_tag"] = req.role_tag

    if updates:
        set_clause = ", ".join(f"{k} = ?" for k in updates)
        conn.execute(
            f"UPDATE deck_cards SET {set_clause} WHERE id = ?",
            list(updates.values()) + [card_id]
        )
        conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
        conn.commit()

    updated = conn.execute("SELECT * FROM deck_cards WHERE id = ?", (card_id,)).fetchone()
    return dict(updated)


# ── 2.3 Deck Analysis ────────────────────────────────────────────

@router.get("/api/decks/{deck_id}/analysis")
async def deck_analysis(deck_id: int):
    """Analyze deck composition — type counts, mana curve, color pips, roles, targets, deltas."""
    _get_deck_or_404(deck_id)
    return _compute_deck_analysis(deck_id)


# ── 2.5 Recommendations from Collection ───────────────────────

@router.get("/api/decks/{deck_id}/recommended-from-collection")
async def recommend_from_collection(deck_id: int, max_results: int = 20, roles: Optional[str] = None):
    """
    Recommend cards from the user's collection for a deck.
    Finds shortfalls, then scores owned cards by how well they fit.
    """
    deck = _get_deck_or_404(deck_id)
    deck_color_identity = deck.get("color_identity", [])
    conn = _get_db_conn()

    analysis = _compute_deck_analysis(deck_id)
    deltas = analysis.get("deltas", {})
    counts_by_type = analysis["counts_by_type"]

    shortfall_types = set()
    for t, delta in deltas.items():
        lo, hi = _TYPE_TARGETS.get(t, [0, 0])
        if counts_by_type.get(t, 0) < lo:
            shortfall_types.add(t)

    in_deck_ids = set(
        r["scryfall_id"] for r in
        conn.execute("SELECT scryfall_id FROM deck_cards WHERE deck_id = ?", (deck_id,)).fetchall()
    )

    role_filter = [r.strip() for r in roles.split(",") if r.strip()] if roles else []

    coll_rows = conn.execute(
        "SELECT * FROM collection_entries WHERE quantity > 0"
    ).fetchall()

    scored = []
    for row in coll_rows:
        card = _row_to_dict(row)
        card_id = card.get("scryfall_id", "")

        if card_id in in_deck_ids:
            continue

        card_ci = card.get("color_identity", [])
        if isinstance(card_ci, str):
            try:
                card_ci = json.loads(card_ci)
            except Exception:
                card_ci = []
        if deck_color_identity and card_ci:
            if not all(c in deck_color_identity for c in card_ci):
                continue

        type_line = card.get("type_line", "")
        oracle_text = card.get("oracle_text", "")
        keywords = card.get("keywords", [])
        card_type = _classify_card_type(type_line)
        card_roles = _detect_card_roles(oracle_text, type_line, keywords)

        if role_filter and not any(r in card_roles for r in role_filter):
            continue

        score = 0
        if card_type in shortfall_types:
            score += 3
        for r in card_roles:
            if r in ("Ramp", "Draw", "Removal", "BoardWipe"):
                score += 2
            else:
                score += 1
        cmc = float(card.get("cmc", 0))
        if cmc <= 3:
            score += 1

        scored.append({
            "id": card.get("id"),
            "scryfall_id": card_id,
            "name": card.get("name"),
            "type_line": type_line,
            "card_type": card_type,
            "cmc": cmc,
            "color_identity": card_ci,
            "owned_qty": card.get("quantity", 0),
            "roles": card_roles,
            "score": score,
            "image_url": f"https://api.scryfall.com/cards/{card_id}?format=image&version=normal" if card_id else None,
        })

    scored.sort(key=lambda x: x["score"], reverse=True)

    grouped = {}
    for card in scored[:max_results]:
        ct = card["card_type"]
        grouped.setdefault(ct, []).append(card)

    return {
        "shortfall_types": list(shortfall_types),
        "role_filter": role_filter,
        "grouped": grouped,
        "total": len(scored[:max_results]),
    }


# ── 2.6 EDHREC-style Recommendations ────────────────────────

@router.get("/api/decks/{deck_id}/edh-recs")
async def deck_edh_recs(deck_id: int, only_owned: bool = False, max_results: int = 30):
    """
    Fetch EDHREC average deck recommendations for this deck's commander.
    Cross-references with collection for owned status.
    """
    deck = _get_deck_or_404(deck_id)
    commander_name = deck.get("commander_name", "")
    if not commander_name:
        raise HTTPException(400, "Deck has no commander_name set. Update the deck first.")

    cache_key = f"edhrec:avg:{_to_edhrec_slug(commander_name)}"
    cached_profile = _edhrec_cache_get(cache_key)
    if cached_profile is None:
        try:
            cached_profile = _fetch_edhrec_average(commander_name)
            _edhrec_cache_set(cache_key, cached_profile)
        except Exception as e:
            raise HTTPException(502, f"Failed to fetch EDHREC data for '{commander_name}': {str(e)}")

    edhrec_profile = cached_profile
    mainboard = edhrec_profile.get("mainboard", {})

    conn = _get_db_conn()

    in_deck_names = set(
        r["card_name"].lower() for r in
        conn.execute("SELECT card_name FROM deck_cards WHERE deck_id = ?", (deck_id,)).fetchall()
    )

    coll_rows = conn.execute(
        "SELECT name, quantity, scryfall_id FROM collection_entries"
    ).fetchall()
    coll_map = {}
    for r in coll_rows:
        key = r["name"].lower()
        existing = coll_map.get(key)
        if not existing or r["quantity"] > existing["qty"]:
            coll_map[key] = {"owned": True, "qty": r["quantity"], "scryfall_id": r["scryfall_id"]}

    coll_details = {}
    for r in conn.execute("SELECT name, type_line, oracle_text, keywords, scryfall_id FROM collection_entries").fetchall():
        key = r["name"].lower()
        if key not in coll_details:
            coll_details[key] = dict(r)

    results = []
    for card_name in mainboard:
        name_lower = card_name.lower()
        if name_lower in in_deck_names:
            continue

        owned_info = coll_map.get(name_lower, {"owned": False, "qty": 0, "scryfall_id": ""})

        if only_owned and not owned_info["owned"]:
            continue

        details = coll_details.get(name_lower, {})
        type_line = details.get("type_line", "")
        oracle_text = details.get("oracle_text", "")
        keywords = details.get("keywords", "[]")
        card_roles = _detect_card_roles(oracle_text, type_line, keywords)
        scryfall_id = owned_info.get("scryfall_id") or details.get("scryfall_id", "")

        results.append({
            "name": card_name,
            "type_line": type_line,
            "role": card_roles[0] if card_roles else "Other",
            "roles": card_roles,
            "inclusion_pct": None,
            "synergy_score": None,
            "owned": owned_info["owned"],
            "owned_qty": owned_info["qty"],
            "scryfall_id": scryfall_id,
            "image_url": f"https://api.scryfall.com/cards/{scryfall_id}?format=image&version=normal" if scryfall_id else None,
        })

    return {
        "commander": commander_name,
        "source": "EDHREC Average",
        "total": len(results[:max_results]),
        "recommendations": results[:max_results],
    }


# ── 2.7 Bulk Add Operations ────────────────────────────────

def _check_ratio_limit(deck_id: int, card_type: str, count_to_add: int = 1) -> bool:
    """
    Return True if adding count_to_add cards of card_type stays within target max.
    """
    analysis = _compute_deck_analysis(deck_id)
    current = analysis["counts_by_type"].get(card_type, 0)
    target_max = _TYPE_TARGETS.get(card_type, [0, 9999])[1]
    return (current + count_to_add) <= target_max


@router.post("/api/decks/{deck_id}/bulk-add")
async def bulk_add_cards(deck_id: int, req: BulkAddRequest):
    """
    Bulk-add cards to a deck by scryfall_id.
    If respect_ratios, skips cards of a type when the target max is already reached.
    """
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()

    added = 0
    skipped = 0
    details = []

    for card_entry in req.cards:
        scryfall_id = str(card_entry.get("scryfall_id", "")).strip()
        quantity = int(card_entry.get("quantity", 1))
        if not scryfall_id:
            skipped += 1
            details.append({"scryfall_id": scryfall_id, "status": "skipped", "reason": "missing scryfall_id"})
            continue

        ce_row = conn.execute(
            "SELECT name, type_line, oracle_text, keywords FROM collection_entries WHERE scryfall_id = ? LIMIT 1",
            (scryfall_id,)
        ).fetchone()
        card_name = ce_row["name"] if ce_row else ""
        type_line = ce_row["type_line"] if ce_row else ""
        card_type = _classify_card_type(type_line)

        if req.respect_ratios and not _check_ratio_limit(deck_id, card_type, quantity):
            skipped += 1
            details.append({
                "scryfall_id": scryfall_id,
                "name": card_name,
                "card_type": card_type,
                "status": "skipped",
                "reason": f"Type '{card_type}' at or above target max",
            })
            continue

        existing = conn.execute(
            "SELECT id, quantity FROM deck_cards WHERE deck_id = ? AND scryfall_id = ?",
            (deck_id, scryfall_id)
        ).fetchone()

        if existing:
            conn.execute(
                "UPDATE deck_cards SET quantity = ? WHERE id = ?",
                (existing["quantity"] + quantity, existing["id"])
            )
        else:
            conn.execute(
                "INSERT INTO deck_cards (deck_id, scryfall_id, card_name, quantity) VALUES (?, ?, ?, ?)",
                (deck_id, scryfall_id, card_name, quantity)
            )
        conn.commit()
        added += 1
        details.append({"scryfall_id": scryfall_id, "name": card_name, "card_type": card_type, "status": "added", "quantity": quantity})

    conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
    conn.commit()

    analysis = _compute_deck_analysis(deck_id)
    return {"added": added, "skipped": skipped, "details": details, "analysis": analysis}


@router.post("/api/decks/{deck_id}/bulk-add-recommended")
async def bulk_add_recommended(deck_id: int, req: BulkAddRecommendedRequest):
    """
    Fetch recommendations from 'collection' or 'edhrec', filter, and bulk-add to deck.
    """
    _get_deck_or_404(deck_id)
    conn = _get_db_conn()

    source = (req.source or "collection").lower()
    type_filter = [t.strip() for t in req.types] if req.types else []
    role_filter = [r.strip() for r in req.roles] if req.roles else []

    candidates = []

    if source == "collection":
        deck = _get_deck_or_404(deck_id)
        deck_color_identity = deck.get("color_identity", [])
        analysis = _compute_deck_analysis(deck_id)
        counts_by_type = analysis["counts_by_type"]
        shortfall_types = {t for t, (lo, _) in _TYPE_TARGETS.items() if counts_by_type.get(t, 0) < lo}

        in_deck_ids = set(
            r["scryfall_id"] for r in
            conn.execute("SELECT scryfall_id FROM deck_cards WHERE deck_id = ?", (deck_id,)).fetchall()
        )
        coll_rows = conn.execute("SELECT * FROM collection_entries WHERE quantity > 0").fetchall()
        for row in coll_rows:
            card = _row_to_dict(row)
            cid = card.get("scryfall_id", "")
            if cid in in_deck_ids:
                continue
            card_ci = card.get("color_identity", [])
            if isinstance(card_ci, str):
                try:
                    card_ci = json.loads(card_ci)
                except Exception:
                    card_ci = []
            if deck_color_identity and card_ci:
                if not all(c in deck_color_identity for c in card_ci):
                    continue
            tl = card.get("type_line", "")
            ct = _classify_card_type(tl)
            card_roles = _detect_card_roles(card.get("oracle_text", ""), tl, card.get("keywords", []))
            if type_filter and ct not in type_filter:
                continue
            if role_filter and not any(r in card_roles for r in role_filter):
                continue
            candidates.append({"scryfall_id": cid, "card_type": ct, "quantity": 1})

    elif source == "edhrec":
        deck = _get_deck_or_404(deck_id)
        commander_name = deck.get("commander_name", "")
        if not commander_name:
            raise HTTPException(400, "Deck has no commander_name set")
        try:
            edhrec_profile = _fetch_edhrec_average(commander_name)
        except Exception as e:
            raise HTTPException(502, f"EDHREC fetch failed: {e}")
        mainboard = edhrec_profile.get("mainboard", {})
        in_deck_names = set(
            r["card_name"].lower() for r in
            conn.execute("SELECT card_name FROM deck_cards WHERE deck_id = ?", (deck_id,)).fetchall()
        )
        coll_rows = conn.execute("SELECT name, scryfall_id, type_line, oracle_text, keywords, quantity FROM collection_entries").fetchall()
        coll_map = {r["name"].lower(): dict(r) for r in coll_rows}

        for card_name in mainboard:
            name_lower = card_name.lower()
            if name_lower in in_deck_names:
                continue
            coll_info = coll_map.get(name_lower)
            if req.only_owned and not coll_info:
                continue
            if not coll_info:
                continue
            scryfall_id = coll_info.get("scryfall_id", "")
            if not scryfall_id:
                continue
            tl = coll_info.get("type_line", "")
            ct = _classify_card_type(tl)
            card_roles = _detect_card_roles(coll_info.get("oracle_text", ""), tl, coll_info.get("keywords", []))
            if type_filter and ct not in type_filter:
                continue
            if role_filter and not any(r in card_roles for r in role_filter):
                continue
            candidates.append({"scryfall_id": scryfall_id, "card_type": ct, "quantity": 1})
    else:
        raise HTTPException(400, f"Unknown source '{source}'. Use 'collection' or 'edhrec'.")

    added = 0
    skipped = 0
    details = []

    for c in candidates:
        scryfall_id = c["scryfall_id"]
        card_type = c["card_type"]
        quantity = c["quantity"]

        if req.respect_ratios and not _check_ratio_limit(deck_id, card_type, quantity):
            skipped += 1
            details.append({"scryfall_id": scryfall_id, "card_type": card_type, "status": "skipped", "reason": "ratio limit"})
            continue

        ce_row = conn.execute(
            "SELECT name FROM collection_entries WHERE scryfall_id = ? LIMIT 1", (scryfall_id,)
        ).fetchone()
        card_name = ce_row["name"] if ce_row else ""

        existing = conn.execute(
            "SELECT id, quantity FROM deck_cards WHERE deck_id = ? AND scryfall_id = ?",
            (deck_id, scryfall_id)
        ).fetchone()
        if existing:
            conn.execute(
                "UPDATE deck_cards SET quantity = ? WHERE id = ?",
                (existing["quantity"] + quantity, existing["id"])
            )
        else:
            conn.execute(
                "INSERT INTO deck_cards (deck_id, scryfall_id, card_name, quantity) VALUES (?, ?, ?, ?)",
                (deck_id, scryfall_id, card_name, quantity)
            )
        conn.commit()
        added += 1
        details.append({"scryfall_id": scryfall_id, "name": card_name, "card_type": card_type, "status": "added"})

    conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
    conn.commit()

    analysis = _compute_deck_analysis(deck_id)
    return {"added": added, "skipped": skipped, "details": details, "analysis": analysis}


# ── 2.9 Simulation Export ───────────────────────────────────

@router.post("/api/decks/{deck_id}/export-to-sim")
async def export_deck_to_sim(deck_id: int):
    """
    Export a deck to Forge .dck format and save to the Forge decks directory.
    Returns the deck name for use in simulations.
    """
    deck = _get_deck_or_404(deck_id)
    conn = _get_db_conn()

    card_rows = conn.execute(
        "SELECT card_name, quantity, is_commander FROM deck_cards WHERE deck_id = ? ORDER BY is_commander DESC, card_name ASC",
        (deck_id,)
    ).fetchall()

    if not card_rows:
        raise HTTPException(400, "Deck has no cards to export")

    lines = ["[metadata]"]
    deck_name = deck.get("name", f"Deck {deck_id}")
    lines.append(f"Name={deck_name}")
    lines.append("Deck Type=Commander")
    lines.append("")

    commanders = [r for r in card_rows if r["is_commander"]]
    mainboard = [r for r in card_rows if not r["is_commander"]]

    lines.append("[Commander]")
    for r in commanders:
        name = r["card_name"] or "Unknown"
        qty = r["quantity"] or 1
        lines.append(f"{qty} {name}")

    lines.append("")
    lines.append("[Main]")
    for r in mainboard:
        name = r["card_name"] or "Unknown"
        qty = r["quantity"] or 1
        lines.append(f"{qty} {name}")

    content = "\n".join(lines)

    safe_name = re.sub(r"[^a-zA-Z0-9 _-]", "", deck_name).replace(" ", "_").strip()
    if not safe_name:
        safe_name = f"deck_{deck_id}"

    save_dir = (
        CFG.user_decks_dir
        or CFG.forge_decks_dir
        or os.path.join(os.path.dirname(__file__), "..", "user-decks")
    )
    os.makedirs(save_dir, exist_ok=True)

    out_path = Path(save_dir) / f"{safe_name}.dck"
    out_path.write_text(content, encoding="utf-8")
    log_deckgen.info(f"  Exported deck {deck_id} to {out_path}")

    return {
        "success": True,
        "deckName": safe_name,
        "dckFile": str(out_path),
        "totalCards": sum(r["quantity"] for r in card_rows),
        "commanderCount": len(commanders),
        "mainboardCount": len(mainboard),
    }


# ══════════════════════════════════════════════════════════════
# Deck Import Endpoint
# ══════════════════════════════════════════════════════════════


def _parse_decklist_text(text: str) -> dict:
    """
    Parse a decklist from text. Supports:
      - Forge .dck format with [Commander], [Deck], [Main] sections
      - MTGA format: 1 Card Name
      - Plain: Card Name (assumed qty 1)
      - Lines starting with // or # are comments
    Returns { 'commanders': [{'name': str, 'qty': int}], 'cards': [{'name': str, 'qty': int}] }
    """
    commanders = []
    cards = []
    section = 'main'

    for raw_line in text.splitlines():
        line = raw_line.strip()
        if not line or line.startswith('//') or line.startswith('#'):
            continue

        low = line.lower()
        if low.startswith('[commander'):
            section = 'commander'
            continue
        if low.startswith('[deck') or low.startswith('[main') or low.startswith('[mainboard'):
            section = 'main'
            continue
        if low.startswith('[sideboard') or low.startswith('[side') or low.startswith('[metadata'):
            section = 'skip'
            continue
        if low.startswith('['):
            section = 'main'
            continue

        if section == 'skip':
            continue

        m = re.match(r'^(\d+)\s*[xX]?\s+(.+)$', line)
        if m:
            qty = int(m.group(1))
            name = m.group(2).strip()
        else:
            qty = 1
            name = line

        name = re.sub(r'\s*\([A-Z0-9]+\)\s*\d*\s*$', '', name).strip()

        if not name:
            continue

        if section == 'commander':
            commanders.append({'name': name, 'qty': qty})
        else:
            cards.append({'name': name, 'qty': qty})

    return {'commanders': commanders, 'cards': cards}


@router.post('/api/decks/{deck_id}/import')
async def import_decklist(deck_id: int, request: FastAPIRequest):
    """
    Import a decklist into an existing deck. Parses text, looks up each card
    on Scryfall, and adds them to the deck.

    Body: { "text": "1 Sol Ring\n1 Cultivate..." , "clearFirst": false }
    """
    deck = _get_deck_or_404(deck_id)
    body = await request.json()
    text = body.get('text', '')
    clear_first = body.get('clearFirst', False)

    if not text.strip():
        return JSONResponse({'error': 'No decklist text provided'}, status_code=400)

    parsed = _parse_decklist_text(text)
    all_entries = []
    for c in parsed['commanders']:
        all_entries.append({**c, 'is_commander': True})
    for c in parsed['cards']:
        all_entries.append({**c, 'is_commander': False})

    if not all_entries:
        return JSONResponse({'error': 'No cards found in decklist'}, status_code=400)

    conn = _get_db_conn()

    if clear_first:
        conn.execute('DELETE FROM deck_cards WHERE deck_id = ?', (deck_id,))
        conn.commit()

    added = 0
    failed = []
    results = []

    for entry in all_entries:
        name = entry['name']
        qty = entry['qty']
        is_cmd = entry['is_commander']

        sf = _scryfall_fuzzy_lookup(name)
        if not sf:
            failed.append(name)
            results.append({'name': name, 'status': 'not_found'})
            continue

        scryfall_id = sf.get('id', '')
        resolved_name = sf.get('name', name)

        existing = conn.execute(
            'SELECT id, quantity FROM deck_cards WHERE deck_id = ? AND scryfall_id = ?',
            (deck_id, scryfall_id)
        ).fetchone()

        if existing:
            conn.execute(
                'UPDATE deck_cards SET quantity = ?, is_commander = ? WHERE id = ?',
                (existing['quantity'] + qty, 1 if is_cmd else existing.get('is_commander', 0), existing['id'])
            )
        else:
            conn.execute(
                'INSERT INTO deck_cards (deck_id, scryfall_id, card_name, quantity, is_commander) VALUES (?, ?, ?, ?, ?)',
                (deck_id, scryfall_id, resolved_name, qty, 1 if is_cmd else 0)
            )
        conn.commit()
        added += 1
        results.append({'name': resolved_name, 'qty': qty, 'status': 'added', 'isCommander': is_cmd})

    cmd_entries = [r for r in results if r.get('isCommander')]
    if cmd_entries:
        cmd_name = cmd_entries[0]['name']
        cmd_row = conn.execute(
            'SELECT scryfall_id FROM deck_cards WHERE deck_id = ? AND is_commander = 1 LIMIT 1',
            (deck_id,)
        ).fetchone()
        cmd_sf_id = cmd_row['scryfall_id'] if cmd_row else ''
        conn.execute(
            'UPDATE decks SET commander_name = ?, commander_scryfall_id = ?, updated_at = datetime(\'now\') WHERE id = ?',
            (cmd_name, cmd_sf_id, deck_id)
        )
    else:
        conn.execute("UPDATE decks SET updated_at = datetime('now') WHERE id = ?", (deck_id,))
    conn.commit()

    return {
        'added': added,
        'failed': len(failed),
        'failedNames': failed,
        'total': len(all_entries),
        'results': results,
    }


@router.post('/api/decks/import-new')
async def import_decklist_new(request: FastAPIRequest):
    """
    Import a decklist as a brand-new deck. Creates the deck, then imports cards.

    Body: { "text": "...", "name": "My Deck" }
    """
    body = await request.json()
    text = body.get('text', '')
    deck_name = body.get('name', '').strip()

    if not text.strip():
        return JSONResponse({'error': 'No decklist text provided'}, status_code=400)

    parsed = _parse_decklist_text(text)
    all_entries = []
    for c in parsed['commanders']:
        all_entries.append({**c, 'is_commander': True})
    for c in parsed['cards']:
        all_entries.append({**c, 'is_commander': False})

    if not all_entries:
        return JSONResponse({'error': 'No cards found in decklist'}, status_code=400)

    if not deck_name:
        cmd = parsed['commanders'][0]['name'] if parsed['commanders'] else None
        deck_name = cmd or 'Imported Deck'

    conn = _get_db_conn()
    cur = conn.execute(
        "INSERT INTO decks (name, created_at, updated_at) VALUES (?, datetime('now'), datetime('now'))",
        (deck_name,)
    )
    conn.commit()
    new_deck_id = cur.lastrowid

    first_cmd_scryfall = None
    first_cmd_name = None

    added = 0
    failed = []

    for entry in all_entries:
        name = entry['name']
        qty = entry['qty']
        is_cmd = entry['is_commander']

        sf = _scryfall_fuzzy_lookup(name)
        if not sf:
            failed.append(name)
            continue

        scryfall_id = sf.get('id', '')
        resolved_name = sf.get('name', name)

        if is_cmd and not first_cmd_scryfall:
            first_cmd_scryfall = scryfall_id
            first_cmd_name = resolved_name

        conn.execute(
            'INSERT INTO deck_cards (deck_id, scryfall_id, card_name, quantity, is_commander) VALUES (?, ?, ?, ?, ?)',
            (new_deck_id, scryfall_id, resolved_name, qty, 1 if is_cmd else 0)
        )
        conn.commit()
        added += 1

    if first_cmd_scryfall:
        conn.execute(
            'UPDATE decks SET commander_name = ?, commander_scryfall_id = ? WHERE id = ?',
            (first_cmd_name, first_cmd_scryfall, new_deck_id)
        )
        conn.commit()

    return {
        'deckId': new_deck_id,
        'deckName': deck_name,
        'added': added,
        'failed': len(failed),
        'failedNames': failed,
        'total': len(all_entries),
    }


# ══════════════════════════════════════════════════════════════
# Card Scanner Endpoint
# ══════════════════════════════════════════════════════════════

def _scryfall_fuzzy_lookup(name: str) -> Optional[dict]:
    """
    Fuzzy-search Scryfall for a card name (used by the scanner pipeline).
    Returns the raw Scryfall JSON dict, or None on failure.
    """
    _scryfall_rate_limit()
    try:
        encoded = quote(name)
        url = f"https://api.scryfall.com/cards/named?fuzzy={encoded}"
        req = Request(url, headers=_API_HEADERS)
        with urlopen(req, timeout=10) as resp:
            data = json.loads(resp.read().decode("utf-8"))
        if data.get("object") == "error":
            return None
        return data
    except Exception:
        return None