import html
import math
from urllib.parse import quote, urlencode

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

from ..auth import require_user
from ..config import (
    DEFAULT_APPFACTORY_HOST,
    DEFAULT_GITEA_ORG,
    DELETE_APP_SCRIPT,
    DEPLOY_SCRIPT,
    GENERATE_COMPOSE_SCRIPT,
    NEW_APP_SCRIPT,
    read_env_value,
)
from ..db.apps import get_app, get_app_deployments, get_apps, update_app_resources
from ..db.audit import log_audit_event
from ..db.jobs import create_job, get_jobs, has_active_deploy_job
from ..routes.deployments import render_status_pill
from ..shell import run_command
from ..templates.layout import page, render_result

router = APIRouter()
DEFAULT_PAGE_SIZE = 20


@router.get("/")
def portal_home(user=Depends(require_user)):
    return RedirectResponse(url="/portal/operations", status_code=303)


@router.get("/apps", response_class=HTMLResponse)
def apps_page(
    request: Request,
    q: str = Query(""),
    status: str = Query(""),
    page_number: int = Query(1, alias="page", ge=1),
    user=Depends(require_user),
):
    apps = get_apps()
    query = q.strip()
    selected_status = status.strip()
    if query:
        apps = [
            item for item in apps
            if query.lower() in (item.get("id", "") or "").lower()
            or query.lower() in (item.get("name", "") or "").lower()
        ]
    if selected_status:
        apps = [item for item in apps if (item.get("status", "") or "") == selected_status]
    status_values = sorted({item.get("status", "") for item in get_apps() if item.get("status")})
    total_apps = len(apps)
    total_pages = max(1, math.ceil(total_apps / DEFAULT_PAGE_SIZE))
    if page_number > total_pages:
        page_number = total_pages
    offset = (page_number - 1) * DEFAULT_PAGE_SIZE
    apps = apps[offset : offset + DEFAULT_PAGE_SIZE]

    gitea_url = read_env_value("GITEA_URL", "")
    gitea_org = read_env_value("GITEA_ORG", DEFAULT_GITEA_ORG)
    host = read_env_value("APPFACTORY_HOST", DEFAULT_APPFACTORY_HOST)

    rows = ""

    for item in apps:
        app_id = html.escape(item.get("id", ""))
        app_url_id = quote(item.get("id", ""), safe="")
        status = html.escape(item.get("status", ""))
        docs = html.escape(item.get("docs", f"/apps/{app_id}/docs"))
        memory = item.get("memory", "")
        cpus = item.get("cpus", "")

        http_clone = html.escape(f"git clone {gitea_url}/{gitea_org}/{app_id}.git")
        ssh_clone = html.escape(f"git clone ssh://git@{host}:2222/{gitea_org}/{app_id}.git")

        memory_options = ""
        for value, label in [
            ("", "Výchozí"),
            ("256m", "256 MB - malá služba"),
            ("512m", "512 MB - běžná služba"),
            ("1g", "1 GB - větší služba"),
            ("2g", "2 GB - náročná služba"),
        ]:
            selected = "selected" if memory == value else ""
            memory_options += f'<option value="{value}" {selected}>{label}</option>'

        cpu_options = ""
        for value, label in [
            ("", "Výchozí"),
            ("0.25", "0,25 CPU - velmi malá služba"),
            ("0.50", "0,50 CPU - běžná služba"),
            ("1.00", "1 CPU - celé jádro"),
            ("2.00", "2 CPU - náročná služba"),
        ]:
            selected = "selected" if cpus == value else ""
            cpu_options += f'<option value="{value}" {selected}>{label}</option>'

        rows += f"""
        <tr>
            <td>
                <strong>{app_id}</strong><br>
                <span class="muted">/apps/{app_id}</span>
            </td>
            <td><span class="pill">{status}</span></td>
            <td><a href="{docs}">Swagger</a></td>
            <td>
                <form method="post" action="/portal/update-resources">
                    <input type="hidden" name="app_id" value="{app_id}">
                    <div class="inline-form">
                        <select name="memory">{memory_options}</select>
                        <select name="cpus">{cpu_options}</select>
                        <button type="submit">Použít</button>
                    </div>
                    <div class="resource-help">
                        Paměť je limit RAM. CPU určuje maximální podíl výpočetního výkonu.
                        Příklad: 0,50 = polovina jádra, 1,00 = celé jádro.
                    </div>
                </form>
            </td>
            <td>
                <details>
                    <summary>Příkazy pro klonování</summary>
                    <label class="muted">HTTP</label>
                    <div class="cmd-row">
                        <input readonly value="{http_clone}" id="http-{app_id}">
                        <button type="button" onclick="return copyText(this)">Kopírovat</button>
                    </div>

                    <label class="muted">SSH</label>
                    <div class="cmd-row">
                        <input readonly value="{ssh_clone}" id="ssh-{app_id}">
                        <button type="button" onclick="return copyText(this)">Kopírovat</button>
                    </div>
                </details>
            </td>
            <td>
                <p><a class="btn" href="/portal/apps/{app_url_id}">Detail</a></p>
                <p><a class="btn btn-secondary" href="/portal/deployments?app_id={app_url_id}">Nasazení</a></p>
                <form method="post" action="/portal/apps/{app_url_id}/redeploy" onsubmit="return confirm('Spustit nové nasazení služby {app_id}?');">
                    <button type="submit" class="btn-secondary">Nasadit znovu</button>
                </form>
                <form method="post" action="/portal/delete-app" onsubmit="return confirm('Smazat {app_id}? Tím se odstraní kontejner, image, workspace, záznam v katalogu a Gitea repozitář.');">
                    <input type="hidden" name="app_id" value="{app_id}">
                    <button type="submit" class="danger">Smazat</button>
                </form>
            </td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="6">Zatím nejsou nasazené žádné služby.</td></tr>'
    status_options = ['<option value="">Všechny stavy</option>']
    for value in status_values:
        selected = " selected" if selected_status == value else ""
        escaped_value = html.escape(value)
        status_options.append(f'<option value="{escaped_value}"{selected}>{escaped_value}</option>')
    first_item = offset + 1 if total_apps else 0
    last_item = min(offset + len(apps), total_apps)

    def page_url(page: int) -> str:
        params = {"page": page}
        if query:
            params["q"] = query
        if selected_status:
            params["status"] = selected_status
        return f"/portal/apps?{urlencode(params)}"

    previous_link = (
        f'<a class="btn btn-secondary" href="{page_url(page_number - 1)}">Předchozí</a>'
        if page_number > 1
        else ""
    )
    next_link = (
        f'<a class="btn btn-secondary" href="{page_url(page_number + 1)}">Další</a>'
        if page_number < total_pages
        else ""
    )
    pagination = ""
    if total_pages > 1:
        pagination = f"""
            <div class="pagination">
                <span>Zobrazeno {first_item}-{last_item} z {total_apps}</span>
                <div class="pagination-actions">
                    {previous_link}
                    <span class="page-indicator">Strana {page_number} / {total_pages}</span>
                    {next_link}
                </div>
            </div>
        """

    return page(
        "Služby",
        f"""
        <div class="grid">
            <div class="card">
                <h2>Služby</h2>
                <p class="muted">Vytváření, nasazení, klonování, nastavení prostředků a mazání služeb.</p>
            </div>
            <div class="card">
                <h2>Zálohy</h2>
                <p class="muted">Vytváření záloh a kopírování příkazů pro obnovu. Obnova je záměrně ruční a chráněná.</p>
                <a class="btn" href="/portal/backups">Spravovat zálohy</a>
            </div>
            <div class="card">
                <h2>Nasazení</h2>
                <p class="muted">Historie posledních běhů nasazení, stavů a výstupů z deploy procesu.</p>
                <a class="btn" href="/portal/deployments">Zobrazit nasazení</a>
            </div>
        </div>

        <div class="card">
            <h2>Nasazené služby</h2>
            <p><a class="btn" href="/portal/new-app">+ Nová služba</a></p>
            <form method="get" action="/portal/apps" class="filter-form">
                <input name="q" value="{html.escape(query)}" placeholder="Název nebo ID služby">
                <select name="status">{"".join(status_options)}</select>
                <input type="hidden" name="page" value="1">
                <button type="submit">Filtrovat</button>
                <a class="btn btn-secondary" href="/portal/apps">Reset</a>
            </form>
            {pagination}
            <table>
                <tr>
                    <th>Služba</th>
                    <th>Status</th>
                    <th>Dokumentace</th>
                    <th>Prostředky</th>
                    <th>Git</th>
                    <th>Akce</th>
                </tr>
                {rows}
            </table>
            {pagination}
        </div>
        """,
        user=user,
    )


@router.get("/apps/{app_id}", response_class=HTMLResponse)
def app_detail(app_id: str, request: Request, user=Depends(require_user)):
    app = get_app(app_id)
    if not app:
        raise HTTPException(status_code=404, detail="App not found")

    escaped_app_id = html.escape(app.get("id", ""))
    app_url_id = quote(app.get("id", ""), safe="")
    name = html.escape(app.get("name", "") or "")
    language = html.escape(app.get("language", "") or "")
    version = html.escape(app.get("version", "") or "")
    status = html.escape(app.get("status", "") or "")
    memory = html.escape(app.get("memory", "") or "")
    cpus = html.escape(app.get("cpus", "") or "")
    updated_at = html.escape(app.get("updated_at", "") or "")

    rows = ""
    for deployment in get_app_deployments(app.get("id", ""), limit=10):
        deployment_id = html.escape(str(deployment.get("id", "")))
        started_at = html.escape(deployment.get("started_at", "") or "")
        triggered_by = html.escape(
            deployment.get("triggered_by_display_name")
            or deployment.get("triggered_by_username")
            or ""
        )
        rows += f"""
        <tr>
            <td><a href="/portal/deployments/{deployment_id}">#{deployment_id}</a></td>
            <td>{render_status_pill(deployment.get("status"))}</td>
            <td>{started_at}</td>
            <td>{triggered_by}</td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="4">Zatím nejsou evidovaná žádná nasazení této služby.</td></tr>'

    job_rows = ""
    for job in get_jobs(limit=100, target=app.get("id", "")):
        if job.get("target_type") != "app" or job.get("target_id") != app.get("id", ""):
            continue

        job_id = html.escape(str(job.get("id", "")))
        job_rows += f"""
        <tr>
            <td><a href="/portal/jobs/{job_id}">#{job_id}</a></td>
            <td>{render_status_pill(job.get("status"))}</td>
            <td>{html.escape(job.get("type", "") or "")}</td>
            <td>{html.escape(job.get("created_at", "") or "")}</td>
        </tr>
        """

    if not job_rows:
        job_rows = '<tr><td colspan="4">Zatím nejsou evidované žádné úlohy této služby.</td></tr>'

    return page(
        f"Služba {escaped_app_id}",
        f"""
        <div class="card">
            <h2>{escaped_app_id}</h2>
            <p class="muted">{name}</p>
            <p>
                <a class="btn" href="/portal/apps">&larr; Zpět na služby</a>
                <a class="btn btn-secondary" href="/portal/deployments?app_id={app_url_id}">Nasazení služby</a>
                <a class="btn btn-secondary" href="/portal/jobs?target={app_url_id}">Úlohy služby</a>
            </p>
            <form method="post" action="/portal/apps/{app_url_id}/redeploy" onsubmit="return confirm('Spustit nové nasazení služby {escaped_app_id}?');">
                <button type="submit">Nasadit znovu</button>
            </form>
        </div>

        <div class="card">
            <h2>Souhrn</h2>
            <table>
                <tr><th>ID</th><td>{escaped_app_id}</td></tr>
                <tr><th>Název</th><td>{name}</td></tr>
                <tr><th>Jazyk</th><td>{language}</td></tr>
                <tr><th>Verze</th><td>{version}</td></tr>
                <tr><th>Status</th><td><span class="pill">{status}</span></td></tr>
                <tr><th>Paměť</th><td>{memory}</td></tr>
                <tr><th>CPU</th><td>{cpus}</td></tr>
                <tr><th>Upraveno</th><td>{updated_at}</td></tr>
                <tr><th>Logy</th><td><a href="/portal/jobs?target={app_url_id}">Zobrazit úlohy a logy</a></td></tr>
            </table>
        </div>

        <div class="card">
            <h2>Historie nasazení</h2>
            <table>
                <tr>
                    <th>ID</th>
                    <th>Status</th>
                    <th>Čas</th>
                    <th>Spustil</th>
                </tr>
                {rows}
            </table>
        </div>

        <div class="card">
            <h2>Historie úloh</h2>
            <table>
                <tr>
                    <th>ID</th>
                    <th>Status</th>
                    <th>Typ</th>
                    <th>Vytvořeno</th>
                </tr>
                {job_rows}
            </table>
        </div>
        """,
        user=user,
    )


@router.post("/apps/{app_id}/redeploy")
def redeploy_app(app_id: str, user=Depends(require_user)):
    app = get_app(app_id)
    if not app:
        raise HTTPException(status_code=404, detail="App not found")

    active_job = has_active_deploy_job("app", app_id)
    if active_job:
        return RedirectResponse(url=f"/portal/jobs/{active_job['id']}", status_code=303)

    job_id = create_job(
        job_type="deploy_app",
        target_type="app",
        target_id=app_id,
        payload={},
        user=user,
        source="portal",
    )
    log_audit_event(
        user,
        action="app.redeploy.queued",
        target_type="app",
        target_id=app_id,
        metadata={"job_id": job_id},
    )

    return RedirectResponse(url=f"/portal/jobs/{job_id}", status_code=303)


@router.get("/new-app", response_class=HTMLResponse)
def new_app_form(request: Request, user=Depends(require_user)):
    return page(
        "Nová služba",
        """
        <div class="card">
            <h2>Vytvořit novou službu</h2>
            <p class="muted">Vytvoří Gitea repozitář, webhook, lokální workspace, první commit a nasadí službu.</p>

            <form method="post" action="/portal/new-app">
                <p>
                    <label>ID služby</label><br>
                    <input name="app_id" placeholder="gmail-service" required>
                </p>

                <p>
                    <label>Název služby</label><br>
                    <input name="app_name" placeholder="Gmail služba" required>
                </p>

                <p>
                    <label>Šablona</label><br>
                    <select name="template">
                        <option value="python-fastapi">Python FastAPI</option>
                    </select>
                </p>

                <button type="submit">Vytvořit službu</button>
            </form>

            <p><a href="/portal/apps">&larr; Zpět</a></p>
        </div>
        """,
        user=user,
    )


@router.post("/new-app", response_class=HTMLResponse)
def create_app(
    app_id: str = Form(...),
    app_name: str = Form(...),
    template: str = Form(...),
    user=Depends(require_user),
):
    if template != "python-fastapi":
        return HTMLResponse("Nepodporovaná šablona", status_code=400)

    create_result = run_command([NEW_APP_SCRIPT, app_id, app_name])
    deploy_result = run_command([DEPLOY_SCRIPT, app_id])

    status = "OK" if create_result.returncode == 0 and deploy_result.returncode == 0 else "FAILED"
    log_audit_event(
        user,
        action="create_app",
        target_type="app",
        target_id=app_id,
        metadata={
            "app_id": app_id,
            "app_name": app_name,
            "template": template,
            "status": status,
            "create_returncode": create_result.returncode,
            "deploy_returncode": deploy_result.returncode,
        },
    )

    return render_result(
        title=f"Vytvoření služby: {status}",
        back_url="/portal/apps",
        sections=[
            ("Výstup vytvoření", create_result.stdout),
            ("Chyba vytvoření", create_result.stderr),
            ("Výstup nasazení", deploy_result.stdout),
            ("Chyba nasazení", deploy_result.stderr),
        ],
        extra_link=f"/apps/{html.escape(app_id)}/docs",
        extra_label="Otevřít Swagger",
        user=user,
    )


@router.post("/delete-app", response_class=HTMLResponse)
def delete_app(app_id: str = Form(...), user=Depends(require_user)):
    result = run_command([DELETE_APP_SCRIPT, app_id])
    status = "OK" if result.returncode == 0 else "FAILED"
    log_audit_event(
        user,
        action="delete_app",
        target_type="app",
        target_id=app_id,
        metadata={
            "app_id": app_id,
            "status": status,
            "returncode": result.returncode,
        },
    )

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


@router.post("/update-resources", response_class=HTMLResponse)
def update_resources(
    app_id: str = Form(...),
    memory: str = Form(""),
    cpus: str = Form(""),
    user=Depends(require_user),
):
    memory = memory.strip()
    cpus = cpus.strip()

    update_app_resources(app_id, memory, cpus)

    catalog_result = run_command(["/tools/generate-catalog.sh"])
    compose_result = run_command([GENERATE_COMPOSE_SCRIPT])
    deploy_result = run_command([DEPLOY_SCRIPT, app_id])

    status = (
        "OK"
        if catalog_result.returncode == 0 and compose_result.returncode == 0 and deploy_result.returncode == 0
        else "FAILED"
    )
    log_audit_event(
        user,
        action="update_resources",
        target_type="app",
        target_id=app_id,
        metadata={
            "app_id": app_id,
            "memory": memory,
            "cpus": cpus,
            "status": status,
            "catalog_returncode": catalog_result.returncode,
            "compose_returncode": compose_result.returncode,
            "deploy_returncode": deploy_result.returncode,
        },
    )

    return render_result(
        title=f"Úprava prostředků: {status}",
        back_url="/portal/apps",
        sections=[
            ("Výstup katalogu", catalog_result.stdout),
            ("Chyba katalogu", catalog_result.stderr),
            ("Výstup compose", compose_result.stdout),
            ("Chyba compose", compose_result.stderr),
            ("Výstup nasazení", deploy_result.stdout),
            ("Chyba nasazení", deploy_result.stderr),
        ],
        user=user,
    )