import html
from pathlib import Path

from fastapi import APIRouter, Depends, Form, Request
from fastapi.responses import HTMLResponse, RedirectResponse

from ..auth import require_user
from ..backups import is_backup_path, list_backups
from ..config import BACKUP_SCRIPT
from ..db.audit import log_audit_event
from ..shell import run_command
from ..templates.layout import page, render_result

router = APIRouter()


@router.get("/backups", response_class=HTMLResponse)
def backups_page(request: Request, user=Depends(require_user)):
    rows = ""

    for path in list_backups():
        size_mb = path.stat().st_size / 1024 / 1024
        backup_name = html.escape(path.name)
        backup_path = html.escape(str(path), quote=True)

        restore_cmd = html.escape(
            f"sudo /home/jiri/workspace/appfactory-tools/scripts/restore-appfactory.sh --force {path}",
            quote=True,
        )

        rows += f"""
        <tr class="backup-row">
            <td>
                <strong>{backup_name}</strong><br>
                <span class="muted">{size_mb:.2f} MB</span>
            </td>
            <td>
                <div class="copy-row">
                    <input readonly value="{backup_path}">
                    <button type="button" class="copy-button" data-copy-value="{backup_path}" onclick="copyText(this)">Kopírovat</button>
                </div>
            </td>
            <td>
                <div class="copy-row">
                    <input readonly value="{restore_cmd}">
                    <button type="button" class="copy-button" data-copy-value="{restore_cmd}" onclick="copyText(this)">Kopírovat</button>
                </div>
                <form method="post" action="/portal/backups/restore-trigger">
                    <input type="hidden" name="backup_path" value="{backup_path}">
                    <button type="submit" class="btn-secondary">Evidovat obnovu</button>
                </form>
                <div class="muted">Obnova je nebezpečná a musí se spustit ručně přes SSH.</div>
            </td>
            <td class="actions-cell">
                <form method="post" action="/portal/backups/delete" onsubmit="return confirm('Smazat zálohu {backup_name}?');">
                    <input type="hidden" name="backup_path" value="{backup_path}">
                    <button type="submit" class="danger">Smazat</button>
                </form>
            </td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="4">Nebyly nalezeny žádné zálohy.</td></tr>'

    return page(
        "Zálohy",
        f"""
        <div class="card">
            <h2>Správa záloh</h2>
            <p class="muted">
                Zálohy neobsahují samotný adresář se zálohami.
                Obnova starší zálohy by neměla smazat novější soubory .tar.gz.
                Obnova zůstává ruční, aby nedošlo k nechtěnému přepsání dat.
            </p>

            <form method="post" action="/portal/backups/create">
                <button type="submit">Vytvořit zálohu</button>
            </form>
        </div>

        <div class="card">
            <h2>Dostupné zálohy</h2>
            <table>
                <tr>
                    <th>Záloha</th>
                    <th>Cesta</th>
                    <th>Příkaz pro obnovu</th>
                    <th>Akce</th>
                </tr>
                {rows}
            </table>
        </div>
        """,
        user=user,
    )


@router.post("/backups/create", response_class=HTMLResponse)
def create_backup(user=Depends(require_user)):
    result = run_command([BACKUP_SCRIPT])
    status = "OK" if result.returncode == 0 else "FAILED"
    log_audit_event(
        user,
        action="backup_create",
        target_type="backup",
        metadata={
            "status": status,
            "returncode": result.returncode,
        },
    )

    return render_result(
        title=f"Vytvoření zálohy: {status}",
        back_url="/portal/backups",
        sections=[("Výstup", result.stdout), ("Chyba", result.stderr)],
        user=user,
    )


@router.post("/backups/delete")
def delete_backup(backup_path: str = Form(...), user=Depends(require_user)):
    target = Path(backup_path)

    if not is_backup_path(target):
        return HTMLResponse("Neplatná cesta k záloze", status_code=400)

    target = target.resolve()
    if target.exists():
        target.unlink()

    return RedirectResponse(url="/portal/backups", status_code=303)


@router.post("/backups/restore-trigger")
def restore_trigger(backup_path: str = Form(...), user=Depends(require_user)):
    target = Path(backup_path)

    if not is_backup_path(target):
        return HTMLResponse("Neplatná cesta k záloze", status_code=400)

    log_audit_event(
        user,
        action="restore_trigger",
        target_type="backup",
        target_id=target.name,
        metadata={
            "backup_path": str(target),
        },
    )

    return RedirectResponse(url="/portal/backups", status_code=303)