"""Flask web application for managing monitored accounts and viewing collected data."""

import os
import logging
from datetime import datetime, timezone

from flask import Flask, render_template, request, redirect, url_for, flash, jsonify
from sqlalchemy import func, desc

from app.db import (
    init_db,
    get_session,
    MonitoredAccount,
    Status,
    Mention,
    CollectionLog,
)
from app.mastodon_api import lookup_account, MastodonAPIError

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

app = Flask(__name__)
app.secret_key = os.environ.get("FLASK_SECRET_KEY", "dev-secret-key")


# Template filters
@app.template_filter('format_number')
def format_number(value):
    """Format number with commas."""
    try:
        return f"{int(value):,}"
    except (ValueError, TypeError):
        return value


@app.template_filter('time_ago')
def time_ago(dt):
    """Convert datetime to time ago string."""
    if not dt:
        return "Never"
    from datetime import datetime, timezone
    now = datetime.now(timezone.utc)
    if dt.tzinfo is None:
        dt = dt.replace(tzinfo=timezone.utc)
    diff = now - dt

    seconds = diff.total_seconds()
    if seconds < 60:
        return "just now"
    elif seconds < 3600:
        mins = int(seconds / 60)
        return f"{mins}m ago"
    elif seconds < 86400:
        hours = int(seconds / 3600)
        return f"{hours}h ago"
    elif seconds < 604800:
        days = int(seconds / 86400)
        return f"{days}d ago"
    else:
        weeks = int(seconds / 604800)
        return f"{weeks}w ago"


@app.template_filter('truncate_text')
def truncate_text(text, length=200):
    """Truncate text to specified length."""
    if not text:
        return ""
    from bs4 import BeautifulSoup
    # Strip HTML tags first
    text = BeautifulSoup(text, 'html.parser').get_text()
    if len(text) <= length:
        return text
    return text[:length] + "..."


@app.template_filter('encode_uri')
def encode_uri(uri):
    """URL encode a URI for use in query parameters."""
    from urllib.parse import quote
    return quote(str(uri), safe='')


# Initialize database on startup
with app.app_context():
    init_db()


@app.route("/")
def index():
    """Dashboard overview."""
    session = get_session()
    try:
        accounts = session.query(MonitoredAccount).order_by(MonitoredAccount.instance, MonitoredAccount.username).all()
        total_statuses = session.query(func.count(Status.id)).scalar() or 0
        total_posts = session.query(func.count(Status.id)).filter(Status.status_type == "post").scalar() or 0
        total_replies = session.query(func.count(Status.id)).filter(Status.status_type == "reply").scalar() or 0
        total_mentions = session.query(func.count(Status.id)).filter(Status.status_type == "mention").scalar() or 0
        total_reblogs = session.query(func.count(Status.id)).filter(Status.status_type == "reblog").scalar() or 0

        # Per-account stats
        account_stats = []
        for acct in accounts:
            count = session.query(func.count(Status.id)).filter(Status.account_db_id == acct.id).scalar() or 0
            last_log = (
                session.query(CollectionLog)
                .filter_by(account_db_id=acct.id)
                .order_by(desc(CollectionLog.started_at))
                .first()
            )
            account_stats.append({
                "account": acct,
                "status_count": count,
                "last_log": last_log,
            })

        # Recent collection logs
        recent_logs = (
            session.query(CollectionLog)
            .order_by(desc(CollectionLog.started_at))
            .limit(20)
            .all()
        )

        return render_template(
            "index.html",
            account_stats=account_stats,
            total_statuses=total_statuses,
            total_posts=total_posts,
            total_replies=total_replies,
            total_mentions=total_mentions,
            total_reblogs=total_reblogs,
            recent_logs=recent_logs,
        )
    finally:
        session.close()


@app.route("/accounts")
def accounts_list():
    """List all monitored accounts."""
    session = get_session()
    try:
        accounts = session.query(MonitoredAccount).order_by(MonitoredAccount.instance, MonitoredAccount.username).all()
        return render_template("accounts.html", accounts=accounts)
    finally:
        session.close()


@app.route("/accounts/add", methods=["POST"])
def accounts_add():
    """Add a new account to monitor."""
    handle = request.form.get("handle", "").strip().lstrip("@")
    if "@" not in handle:
        flash("Invalid handle format. Use @user@instance.social", "error")
        return redirect(url_for("accounts_list"))

    username, instance = handle.split("@", 1)
    if not username or not instance:
        flash("Invalid handle format. Use @user@instance.social", "error")
        return redirect(url_for("accounts_list"))

    session = get_session()
    try:
        existing = session.query(MonitoredAccount).filter_by(username=username, instance=instance).first()
        if existing:
            if not existing.is_active:
                existing.is_active = True
                session.commit()
                flash(f"Re-activated {existing.handle}", "success")
            else:
                flash(f"{existing.handle} is already being monitored", "info")
            return redirect(url_for("accounts_list"))

        # Try to resolve the account first
        try:
            data = lookup_account(instance, username)
            acct = MonitoredAccount(
                username=username,
                instance=instance,
                account_id=data["id"],
                display_name=data.get("display_name", ""),
                avatar_url=data.get("avatar", ""),
                note=data.get("note", ""),
                is_active=True,
            )
        except MastodonAPIError as e:
            logger.warning("Could not resolve account @%s@%s: %s — adding anyway", username, instance, e)
            acct = MonitoredAccount(
                username=username,
                instance=instance,
                is_active=True,
            )

        session.add(acct)
        session.commit()
        flash(f"Added {acct.handle} to monitoring list", "success")
        return redirect(url_for("accounts_list"))

    finally:
        session.close()


@app.route("/accounts/<int:account_id>/toggle", methods=["POST"])
def accounts_toggle(account_id):
    """Toggle an account's active status."""
    session = get_session()
    try:
        acct = session.query(MonitoredAccount).get(account_id)
        if acct:
            acct.is_active = not acct.is_active
            session.commit()
            state = "activated" if acct.is_active else "paused"
            flash(f"{state.capitalize()} monitoring for {acct.handle}", "success")
        return redirect(url_for("accounts_list"))
    finally:
        session.close()


@app.route("/accounts/<int:account_id>/delete", methods=["POST"])
def accounts_delete(account_id):
    """Delete an account and all its collected data."""
    session = get_session()
    try:
        acct = session.query(MonitoredAccount).get(account_id)
        if acct:
            handle = acct.handle
            # Delete associated statuses (cascades to mentions, media, tags)
            session.query(Status).filter_by(account_db_id=acct.id).delete()
            session.query(CollectionLog).filter_by(account_db_id=acct.id).delete()
            session.delete(acct)
            session.commit()
            flash(f"Deleted {handle} and all collected data", "success")
        return redirect(url_for("accounts_list"))
    finally:
        session.close()


@app.route("/statuses")
def statuses_list():
    """Browse collected statuses with filters."""
    session = get_session()
    try:
        page = request.args.get("page", 1, type=int)
        per_page = request.args.get("per_page", 50, type=int)
        account_id = request.args.get("account_id", type=int)
        status_type = request.args.get("type", "")
        search = request.args.get("q", "").strip()

        query = session.query(Status).join(MonitoredAccount)

        if account_id:
            query = query.filter(Status.account_db_id == account_id)
        if status_type:
            query = query.filter(Status.status_type == status_type)
        if search:
            query = query.filter(Status.text_content.ilike(f"%{search}%"))

        total = query.count()
        statuses = (
            query.order_by(desc(Status.created_at))
            .offset((page - 1) * per_page)
            .limit(per_page)
            .all()
        )

        accounts = session.query(MonitoredAccount).order_by(MonitoredAccount.username).all()
        total_pages = max(1, (total + per_page - 1) // per_page)

        return render_template(
            "statuses.html",
            statuses=statuses,
            accounts=accounts,
            page=page,
            per_page=per_page,
            total=total,
            total_pages=total_pages,
            current_account_id=account_id,
            current_type=status_type,
            search=search,
        )
    finally:
        session.close()


@app.route("/statuses/<int:status_db_id>")
def status_detail(status_db_id):
    """View a single status with all details."""
    session = get_session()
    try:
        status = session.query(Status).get(status_db_id)
        if not status:
            flash("Status not found", "error")
            return redirect(url_for("statuses_list"))
        return render_template("status_detail.html", status=status)
    finally:
        session.close()


@app.route("/api/stats")
def api_stats():
    """JSON API endpoint for stats (useful for your analysis pipeline)."""
    session = get_session()
    try:
        stats = {
            "total_statuses": session.query(func.count(Status.id)).scalar() or 0,
            "by_type": {},
            "accounts": [],
        }
        for stype in ["post", "reply", "mention", "reblog"]:
            stats["by_type"][stype] = (
                session.query(func.count(Status.id)).filter(Status.status_type == stype).scalar() or 0
            )

        accounts = session.query(MonitoredAccount).filter_by(is_active=True).all()
        for acct in accounts:
            count = session.query(func.count(Status.id)).filter(Status.account_db_id == acct.id).scalar() or 0
            stats["accounts"].append({
                "handle": acct.handle,
                "status_count": count,
                "last_collected": acct.last_collected_at.isoformat() if acct.last_collected_at else None,
            })

        return jsonify(stats)
    finally:
        session.close()


@app.route("/api/statuses")
def api_statuses():
    """JSON API endpoint for statuses (for your analysis pipeline)."""
    session = get_session()
    try:
        page = request.args.get("page", 1, type=int)
        per_page = min(request.args.get("per_page", 100, type=int), 500)
        account_id = request.args.get("account_id", type=int)
        status_type = request.args.get("type", "")
        since = request.args.get("since", "")  # ISO datetime

        query = session.query(Status)

        if account_id:
            query = query.filter(Status.account_db_id == account_id)
        if status_type:
            query = query.filter(Status.status_type == status_type)
        if since:
            query = query.filter(Status.created_at >= since)

        total = query.count()
        statuses = (
            query.order_by(desc(Status.created_at))
            .offset((page - 1) * per_page)
            .limit(per_page)
            .all()
        )

        return jsonify({
            "total": total,
            "page": page,
            "per_page": per_page,
            "statuses": [
                {
                    "id": s.id,
                    "status_id": s.status_id,
                    "account": s.account.handle,
                    "url": s.url,
                    "content": s.content,
                    "text_content": s.text_content,
                    "visibility": s.visibility,
                    "created_at": s.created_at.isoformat() if s.created_at else None,
                    "language": s.language,
                    "status_type": s.status_type,
                    "in_reply_to_id": s.in_reply_to_id,
                    "replies_count": s.replies_count,
                    "reblogs_count": s.reblogs_count,
                    "favourites_count": s.favourites_count,
                    "mentions": [
                        {"acct": m.mentioned_acct, "url": m.mentioned_url}
                        for m in s.mentions
                    ],
                    "tags": [t.name for t in s.tags],
                }
                for s in statuses
            ],
        })
    finally:
        session.close()


@app.route("/export")
def export_csv():
    """Export statuses as CSV for analysis."""
    from io import StringIO
    import csv

    session = get_session()
    try:
        account_id = request.args.get("account_id", type=int)
        status_type = request.args.get("type", "")

        query = session.query(Status).join(MonitoredAccount)
        if account_id:
            query = query.filter(Status.account_db_id == account_id)
        if status_type:
            query = query.filter(Status.status_type == status_type)

        statuses = query.order_by(desc(Status.created_at)).all()

        output = StringIO()
        writer = csv.writer(output)
        writer.writerow([
            "id", "account", "status_type", "created_at", "url",
            "text_content", "language", "visibility", "in_reply_to_id",
            "replies_count", "reblogs_count", "favourites_count",
            "mentions", "tags", "sensitive", "spoiler_text",
        ])

        for s in statuses:
            mentions_str = "; ".join(m.mentioned_acct for m in s.mentions)
            tags_str = "; ".join(t.name for t in s.tags)
            writer.writerow([
                s.status_id, s.account.handle, s.status_type,
                s.created_at.isoformat() if s.created_at else "",
                s.url, s.text_content, s.language, s.visibility,
                s.in_reply_to_id, s.replies_count, s.reblogs_count,
                s.favourites_count, mentions_str, tags_str,
                s.sensitive, s.spoiler_text,
            ])

        from flask import Response
        return Response(
            output.getvalue(),
            mimetype="text/csv",
            headers={"Content-Disposition": "attachment; filename=mastodon_statuses.csv"},
        )
    finally:
        session.close()


@app.route("/analysis")
def analysis_dashboard():
    """Toxicity analysis dashboard."""
    from app.analysis_helpers import (
        get_analysis_stats,
        get_toxicity_trend,
        get_category_averages,
        get_recent_analysis_runs,
        TOXICITY_CATEGORIES,
    )
    import json

    session = get_session()
    try:
        stats = get_analysis_stats(session)
        trend = get_toxicity_trend(session, weeks=12)
        categories = get_category_averages(session)
        runs = get_recent_analysis_runs(session, limit=5)

        # Prepare chart data
        trend_json = json.dumps([
            {
                "week": r["week"].strftime("%Y-%m-%d") if r["week"] else "",
                "avg_toxicity": round(float(r["avg_toxicity"]), 4),
                "flagged_posts": int(r["flagged_posts"]),
                "flagged_mentions": int(r["flagged_mentions"]),
            }
            for r in trend
        ])

        categories_json = json.dumps({k: round(float(v), 4) for k, v in categories.items()})

        return render_template(
            "analysis.html",
            stats=stats,
            trend_json=trend_json,
            categories_json=categories_json,
            categories=TOXICITY_CATEGORIES,
            runs=runs,
        )
    finally:
        session.close()


@app.route("/analysis/flagged")
def analysis_flagged():
    """View flagged content."""
    from app.analysis_helpers import (
        get_flagged_content,
        get_accounts_for_select,
        TOXICITY_CATEGORIES,
    )

    session = get_session()
    try:
        category = request.args.get("category") or None
        account_id = request.args.get("account_id", type=int) or None
        threshold = request.args.get("threshold", 0.5, type=float)
        review_status = request.args.get("review_status") or None
        date_from = request.args.get("date_from") or None
        date_to = request.args.get("date_to") or None
        sort = request.args.get("sort", "overall")
        direction = request.args.get("dir", "desc")
        page = max(1, request.args.get("page", 1, type=int))
        per_page = 50

        items, total = get_flagged_content(
            session,
            category=category,
            account_id=account_id,
            threshold=threshold,
            review_status=review_status,
            date_from=date_from,
            date_to=date_to,
            sort=sort,
            direction=direction,
            limit=per_page,
            offset=(page - 1) * per_page,
        )
        total_pages = max(1, (total + per_page - 1) // per_page)
        accounts = get_accounts_for_select(session)

        return render_template(
            "flagged.html",
            items=items,
            total=total,
            page=page,
            total_pages=total_pages,
            accounts=accounts,
            categories=TOXICITY_CATEGORIES,
            category=category or "",
            account_id=account_id or "",
            threshold=threshold,
            review_status=review_status or "",
            date_from=date_from or "",
            date_to=date_to or "",
            sort=sort,
            direction=direction,
        )
    finally:
        session.close()


@app.route("/api/review/submit", methods=["POST"])
def api_review_submit():
    """Submit a human review for a flagged status."""
    from sqlalchemy import text

    data = request.get_json()
    logger.info(f"Review submission received: {data}")
    status_id = data.get("status_id")
    review_status = data.get("review_status")

    if not all([status_id, review_status]):
        logger.error(f"Missing fields - status_id: {status_id}, review_status: {review_status}")
        return jsonify({"error": "Missing required fields"}), 400

    if review_status not in ["correct", "incorrect", "unsure"]:
        logger.error(f"Invalid review_status: {review_status}")
        return jsonify({"error": "Invalid review_status"}), 400

    session = get_session()
    try:
        result = session.execute(text("""
            UPDATE toxicity_scores
            SET human_reviewed = true,
                review_status = :review_status,
                reviewed_at = NOW()
            WHERE status_id = :status_id
        """), {"review_status": review_status, "status_id": status_id})
        session.commit()
        logger.info(f"Review saved for status_id {status_id}: {review_status} (rows affected: {result.rowcount})")

        return jsonify({"success": True, "message": "Review submitted"}), 200
    except Exception as e:
        session.rollback()
        logger.error(f"Failed to submit review: {e}")
        return jsonify({"error": str(e)}), 500
    finally:
        session.close()


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=5000, debug=True)