"""
Shell Generator - One-click Linux shell script generator
Single-file Flask app + dedicated generator modules.
"""
import os
import io
import zipfile
import datetime
import subprocess
from pathlib import Path
from flask import (Flask, render_template, request, jsonify, Response,
                   send_file, abort, redirect, url_for, session, flash)

# Import all generator modules so they self-register via @register
from generators import (  # noqa: F401
    list_generators, get_generator, get_categories,
    category_labels, category_icons,
)
from generators.middleware import *  # noqa: F401  (registers)
from generators.runtimes import *    # noqa: F401
from generators.systemd_svc import *  # noqa: F401
from generators.system import *      # noqa: F401
from generators.network import *     # noqa: F401
from generators.databases import *   # noqa: F401
from generators.monitoring import *  # noqa: F401

BASE_DIR = Path(__file__).parent
app = Flask(__name__, instance_path=str(BASE_DIR / "instance"))
app.config["SECRET_KEY"] = os.environ.get("SHELLGEN_SECRET", "shell-gen-default-secret-change-me")
app.config["JSON_AS_ASCII"] = False


# ----------------------------- Routes -----------------------------

@app.route("/")
def index():
    return render_template(
        "index.html",
        categories=get_categories(),
        category_labels=category_labels,
        category_icons=category_icons,
        total=len(list_generators()),
    )


@app.route("/gen/<generator_id>")
def generator_page(generator_id):
    gen = get_generator(generator_id)
    if gen is None:
        abort(404, f"Unknown generator: {generator_id}")
    return render_template(
        "generator.html",
        gen=gen,
        category_labels=category_labels,
        category_icons=category_icons,
        all_cats=get_categories(),
    )


@app.route("/api/preview", methods=["POST"])
def api_preview():
    """Generate script preview without running anything."""
    data = request.get_json(silent=True) or {}
    gen_id = data.get("generator")
    params = data.get("params", {})
    gen = get_generator(gen_id) if gen_id else None
    if gen is None:
        return jsonify({"ok": False, "error": f"Unknown generator: {gen_id}"}), 400
    try:
        script = gen.render(params)
    except Exception as e:
        return jsonify({"ok": False, "error": f"{type(e).__name__}: {e}"}), 400
    return jsonify({
        "ok": True,
        "script": script,
        "title": gen.title,
        "description": gen.description,
        "warnings": gen.warnings,
        "post_steps": gen.post_steps,
        "verify_steps": gen.verify_steps,
    })


@app.route("/api/download", methods=["POST"])
def api_download():
    data = request.get_json(silent=True) or {}
    gen_id = data.get("generator")
    params = data.get("params", {})
    gen = get_generator(gen_id) if gen_id else None
    if gen is None:
        return jsonify({"ok": False, "error": f"Unknown generator: {gen_id}"}), 400
    try:
        script = gen.render(params)
    except Exception as e:
        return jsonify({"ok": False, "error": f"{type(e).__name__}: {e}"}), 400
    fname = f"{gen_id}.sh"
    headers = {"Content-Disposition": f'attachment; filename="{fname}"'}
    return Response(script, mimetype="text/x-shellscript", headers=headers)


@app.route("/api/bundle", methods=["POST"])
def api_bundle():
    """Bundle multiple generators into a single zip of .sh files."""
    data = request.get_json(silent=True) or {}
    items = data.get("items", [])
    buf = io.BytesIO()
    with zipfile.ZipFile(buf, "w", zipfile.ZIP_DEFLATED) as z:
        for entry in items:
            gid = entry.get("generator")
            params = entry.get("params", {})
            gen = get_generator(gid)
            if gen is None:
                continue
            try:
                script = gen.render(params)
            except Exception as e:
                script = f"#!/usr/bin/env bash\necho 'ERROR generating {gid}: {e}'\nexit 1\n"
            z.writestr(f"{gid}.sh", script)
        # Master installer
        master = ["#!/usr/bin/env bash", "set -e", "# Auto-generated by shell-gen"]
        for entry in items:
            gid = entry.get("generator")
            if get_generator(gid) is None:
                continue
            master.append(f'echo "===> {gid}"')
            master.append(f"bash \"$(dirname \"$0\")/{gid}.sh\"")
        z.writestr("install-all.sh", "\n".join(master) + "\n")
    buf.seek(0)
    return send_file(buf, mimetype="application/zip", as_attachment=True,
                     download_name=f"shell-gen-bundle-{datetime.datetime.now():%Y%m%d-%H%M%S}.zip")


@app.route("/api/categories")
def api_categories():
    out = []
    for cat in get_categories():
        gens = [g for g in list_generators().values() if g.category == cat]
        out.append({
            "id": cat,
            "label": category_labels.get(cat, cat),
            "icon": category_icons.get(cat, "📦"),
            "items": [g.summary() for g in gens],
        })
    return jsonify({"ok": True, "categories": out})


@app.route("/healthz")
def healthz():
    return jsonify({"ok": True, "generators": len(list_generators())})


if __name__ == "__main__":
    os.makedirs(app.instance_path, exist_ok=True)
    with app.app_context():
        # Touch a db-less startup log
        pass
    port = int(os.environ.get("PORT", 5099))
    app.run(host="0.0.0.0", port=port, debug=False)