from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from app.database import get_db
from app.models.match import Match, MatchPlayer, MatchStage, MatchStatus, MatchType
from app.models.player import Player
from app.services import matchmaking
from pydantic import BaseModel
from typing import Optional, List

router = APIRouter(prefix="/matches", tags=["matches"])


class CreateMatchRequest(BaseModel):
    title: str
    stage: str = "open"
    match_type: str = "doubles"
    creator_player_id: int
    elo_tolerance: float = 200


class JoinMatchRequest(BaseModel):
    player_id: int
    team: int


class ScoreUpdateRequest(BaseModel):
    team1_score: int
    team2_score: int


def match_to_dict(match: Match, db: Session) -> dict:
    players = db.query(MatchPlayer).filter(MatchPlayer.match_id == match.id).all()
    team1 = []
    team2 = []
    for mp in players:
        p = db.query(Player).filter(Player.id == mp.player_id).first()
        if p:
            pdata = {
                "id": p.id,
                "name": p.name,
                "elo": round(p.elo_rating, 1),
                "avatar_color": p.avatar_color,
                "elo_change": mp.elo_change,
            }
            if mp.team == 1:
                team1.append(pdata)
            else:
                team2.append(pdata)

    return {
        "id": match.id,
        "title": match.title,
        "stage": match.stage.value,
        "match_type": match.match_type.value,
        "status": match.status.value,
        "team1": team1,
        "team2": team2,
        "team1_score": match.team1_score,
        "team2_score": match.team2_score,
        "max_players": match.max_players,
        "current_players": len(players),
        "min_elo": match.min_elo,
        "max_elo": match.max_elo,
        "court_id": match.court_id,
        "court_name": match.court.name if match.court else None,
        "started_at": match.started_at.isoformat() if match.started_at else None,
        "ended_at": match.ended_at.isoformat() if match.ended_at else None,
        "created_at": match.created_at.isoformat() if match.created_at else None,
    }


@router.get("/")
def get_matches(status: Optional[str] = None, stage: Optional[str] = None, db: Session = Depends(get_db)):
    query = db.query(Match)
    if status:
        query = query.filter(Match.status == status)
    if stage:
        query = query.filter(Match.stage == stage)
    matches = query.order_by(Match.created_at.desc()).limit(50).all()
    return [match_to_dict(m, db) for m in matches]


@router.get("/lobby")
def get_lobby(db: Session = Depends(get_db)):
    matches = matchmaking.get_lobby_matches(db)
    return [match_to_dict(m, db) for m in matches]


@router.get("/active")
def get_active_matches(db: Session = Depends(get_db)):
    matches = db.query(Match).filter(Match.status == MatchStatus.IN_PROGRESS).all()
    return [match_to_dict(m, db) for m in matches]


@router.get("/{match_id}")
def get_match(match_id: int, db: Session = Depends(get_db)):
    match = db.query(Match).filter(Match.id == match_id).first()
    if not match:
        raise HTTPException(status_code=404, detail="Match not found")
    return match_to_dict(match, db)


@router.post("/")
def create_match(req: CreateMatchRequest, db: Session = Depends(get_db)):
    player = db.query(Player).filter(Player.id == req.creator_player_id).first()
    if not player:
        raise HTTPException(status_code=404, detail="Player not found")

    match_type = MatchType.DOUBLES if req.match_type == "doubles" else MatchType.SINGLES

    if req.stage == "open":
        match = matchmaking.create_open_match(db, req.title, match_type)
    elif req.stage == "skill_based":
        match = matchmaking.create_skill_match(db, req.title, player.elo_rating, match_type, req.elo_tolerance)
    else:
        raise HTTPException(status_code=400, detail="Invalid stage. Use 'open' or 'skill_based'")

    # Auto-join creator to team 1
    matchmaking.join_match(db, match.id, player.id, 1)
    return match_to_dict(match, db)


@router.post("/{match_id}/join")
def join_match(match_id: int, req: JoinMatchRequest, db: Session = Depends(get_db)):
    result = matchmaking.join_match(db, match_id, req.player_id, req.team)
    if not result:
        raise HTTPException(status_code=400, detail="Cannot join match (full, ELO constraint, or already joined)")

    match = db.query(Match).filter(Match.id == match_id).first()
    return match_to_dict(match, db)


@router.post("/{match_id}/start")
def start_match(match_id: int, db: Session = Depends(get_db)):
    match = matchmaking.start_match(db, match_id)
    if not match:
        raise HTTPException(status_code=400, detail="Cannot start match (not enough players or already started)")
    return match_to_dict(match, db)


@router.post("/{match_id}/score")
def update_score(match_id: int, req: ScoreUpdateRequest, db: Session = Depends(get_db)):
    match = db.query(Match).filter(Match.id == match_id).first()
    if not match:
        raise HTTPException(status_code=404, detail="Match not found")
    if match.status != MatchStatus.IN_PROGRESS:
        raise HTTPException(status_code=400, detail="Match not in progress")

    match.team1_score = req.team1_score
    match.team2_score = req.team2_score
    db.commit()
    return match_to_dict(match, db)


@router.post("/{match_id}/complete")
def complete_match(match_id: int, req: ScoreUpdateRequest, db: Session = Depends(get_db)):
    match = matchmaking.complete_match(db, match_id, req.team1_score, req.team2_score)
    if not match:
        raise HTTPException(status_code=400, detail="Cannot complete match")
    return match_to_dict(match, db)