import html
import json
from urllib.parse import quote

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

from app.auth import require_user
from app.db.audit import log_audit_event
from app.db.jobs import cancel_job, get_job, get_job_logs, get_job_stats, get_jobs, retry_failed_job
from app.routes.deployments import calculate_duration, render_status_pill
from app.templates.layout import page

router = APIRouter()

LIVE_STATUSES = {"queued", "running", "cancelled_requested"}
JOB_STATUSES = {"queued", "running", "cancelled_requested", "cancelled", "success", "failed"}
JOB_FILTER_STATUSES = ("queued", "running", "success", "failed", "cancelled")
JOB_FILTER_TYPES = ("deploy_app", "deploy_core_service")


def render_job_status(status: str | None) -> str:
    status_value = status or ""
    normalized = status_value.lower()
    if normalized not in JOB_STATUSES:
        return render_status_pill(status)

    if normalized == "success":
        class_name = "pill pill-success"
    elif normalized in {"queued", "running", "cancelled_requested"}:
        class_name = "pill pill-warning"
    elif normalized in {"failed", "cancelled"}:
        class_name = "pill pill-danger"
    else:
        class_name = "pill pill-muted"

    return f'<span class="{class_name}">{html.escape(status_value)}</span>'


def pretty_json(value: str | None) -> str:
    if not value:
        return "{}"

    try:
        return json.dumps(json.loads(value), ensure_ascii=False, indent=2, sort_keys=True)
    except (TypeError, ValueError):
        return value


def render_options(values: tuple[str, ...], selected: str, empty_label: str) -> str:
    options = [f'<option value="">{html.escape(empty_label)}</option>']
    for value in values:
        selected_attr = " selected" if selected == value else ""
        escaped_value = html.escape(value)
        options.append(f'<option value="{escaped_value}"{selected_attr}>{escaped_value}</option>')
    return "".join(options)


@router.get("/jobs", response_class=HTMLResponse)
def jobs_page(
    request: Request,
    status: str = Query(""),
    job_type: str = Query("", alias="type"),
    target: str = Query(""),
    user=Depends(require_user),
):
    selected_status = status.strip().lower()
    selected_type = job_type.strip()
    selected_target = target.strip()
    if selected_status not in JOB_FILTER_STATUSES:
        selected_status = ""
    if selected_type not in JOB_FILTER_TYPES:
        selected_type = ""

    jobs = get_jobs(
        status=selected_status or None,
        job_type=selected_type or None,
        target=selected_target or None,
    )
    stats = get_job_stats()
    refresh = "<script>setTimeout(() => window.location.reload(), 5000);</script>" if any(
        (job.get("status") or "").lower() in LIVE_STATUSES for job in jobs
    ) else ""

    rows = ""
    for job in jobs:
        job_id = html.escape(str(job.get("id", "")))
        status = render_job_status(job.get("status"))
        source = html.escape(job.get("source", "") or "")
        target_type = html.escape(job.get("target_type", "") or "")
        target_id = html.escape(job.get("target_id", "") or "")
        job_type = html.escape(job.get("type", "") or "")
        created_by = html.escape(job.get("created_by_display_name") or job.get("created_by_username") or "")
        created_at = html.escape(job.get("created_at", "") or "")
        started_at = html.escape(job.get("started_at", "") or "")
        finished_at = html.escape(job.get("finished_at", "") or "")
        row_class = ' class="running-row"' if (job.get("status") or "").lower() == "running" else ""

        rows += f"""
        <tr{row_class}>
            <td>
                <strong><a href="/portal/jobs/{job_id}">#{job_id}</a></strong><br>
                <span class="muted">{job_type}</span>
            </td>
            <td>{status}</td>
            <td>{source}</td>
            <td>{target_type}: <strong>{target_id}</strong></td>
            <td>{created_by}</td>
            <td>{created_at}</td>
            <td>{started_at}</td>
            <td>{finished_at}</td>
            <td class="actions-cell"><a class="btn" href="/portal/jobs/{job_id}">Detail</a></td>
        </tr>
        """

    if not rows:
        rows = '<tr><td colspan="9">Zatím nejsou evidované žádné joby.</td></tr>'

    status_options = render_options(JOB_FILTER_STATUSES, selected_status, "Všechny statusy")
    type_options = render_options(JOB_FILTER_TYPES, selected_type, "Všechny typy")
    target_value = html.escape(selected_target)

    return page(
        "Joby",
        f"""
        {refresh}
        <div class="card">
            <h2>Joby</h2>
            <p class="muted">Fronta portálových a webhook úloh připravená pro centrální worker.</p>
        </div>

        <div class="stats-grid">
            <div class="stat-card stat-warning"><span>Queued</span><strong>{stats.get("queued") or 0}</strong></div>
            <div class="stat-card stat-warning"><span>Running</span><strong>{stats.get("running") or 0}</strong></div>
            <div class="stat-card stat-danger"><span>Failed</span><strong>{stats.get("failed") or 0}</strong></div>
            <div class="stat-card stat-success"><span>Success</span><strong>{stats.get("success") or 0}</strong></div>
        </div>

        <div class="card">
            <h2>Filtry</h2>
            <form method="get" action="/portal/jobs" class="filter-form">
                <select name="status">{status_options}</select>
                <select name="type">{type_options}</select>
                <input name="target" value="{target_value}" placeholder="Target">
                <button type="submit">Filtrovat</button>
                <a class="btn btn-secondary" href="/portal/jobs">Reset</a>
            </form>
        </div>

        <div class="card">
            <h2>Fronta</h2>
            <table>
                <tr>
                    <th>ID</th>
                    <th>Status</th>
                    <th>Source</th>
                    <th>Target</th>
                    <th>Created by</th>
                    <th>Created at</th>
                    <th>Started at</th>
                    <th>Finished at</th>
                    <th>Akce</th>
                </tr>
                {rows}
            </table>
        </div>
        """,
        user=user,
    )


@router.get("/jobs/{job_id}", response_class=HTMLResponse)
def job_detail_page(job_id: int, request: Request, user=Depends(require_user)):
    job = get_job(job_id)
    if not job:
        raise HTTPException(status_code=404, detail="Job not found")

    status_value = (job.get("status") or "").lower()
    refresh = "<script>setTimeout(() => window.location.reload(), 5000);</script>" if status_value in LIVE_STATUSES else ""
    title = f"Job #{html.escape(str(job.get('id', job_id)))}"
    status = render_job_status(job.get("status"))
    target_type = job.get("target_type", "") or ""
    target_id = job.get("target_id", "") or ""
    target_id_html = html.escape(target_id)
    target_url = f"/portal/apps/{quote(target_id, safe='')}" if target_type == "app" else "/portal/jobs"
    duration = html.escape(calculate_duration(job.get("started_at"), job.get("finished_at")))
    payload = html.escape(pretty_json(job.get("payload_json")))
    result = html.escape(pretty_json(job.get("result_json")))
    error_text = html.escape(job.get("error_text", "") or "")
    actions = ""
    if status_value == "failed":
        actions += f"""
                <form method="post" action="/portal/jobs/{html.escape(str(job_id))}/retry" onsubmit="return confirm('Retry job #{html.escape(str(job_id))}?');">
                    <button type="submit">Retry Job</button>
                </form>
        """
    if status_value in {"queued", "running"}:
        actions += f"""
                <form method="post" action="/portal/jobs/{html.escape(str(job_id))}/cancel" onsubmit="return confirm('Cancel job #{html.escape(str(job_id))}?');">
                    <button type="submit" class="danger">Cancel Job</button>
                </form>
        """
    if actions:
        actions = f"""
            <div class="inline-form">
                {actions}
            </div>
        """

    log_blocks = ""
    for log in get_job_logs(job_id):
        stream = html.escape(log.get("stream", "") or "system")
        created_at = html.escape(log.get("created_at", "") or "")
        message = html.escape(log.get("message", "") or "")
        class_name = "log-stderr" if stream == "stderr" else "log-stdout"
        log_blocks += f"""
        <div class="job-log-entry">
            <div class="muted">{created_at} · {stream}</div>
            <pre class="log-viewer {class_name}">{message}</pre>
        </div>
        """

    if not log_blocks:
        log_blocks = '<p class="muted">Zatím nejsou uložené žádné logy.</p>'

    return page(
        title,
        f"""
        {refresh}
        <div class="card">
            <h2>{title}</h2>
            <p>
                <a class="btn" href="/portal/jobs">&larr; Zpět na joby</a>
                <a class="btn btn-secondary" href="{target_url}">Detail targetu</a>
            </p>
            {actions}
        </div>

        <div class="card">
            <h2>Souhrn</h2>
            <table>
                <tr><th>Typ</th><td>{html.escape(job.get("type", "") or "")}</td></tr>
                <tr><th>Status</th><td>{status}</td></tr>
                <tr><th>Source</th><td>{html.escape(job.get("source", "") or "")}</td></tr>
                <tr><th>Target</th><td>{html.escape(target_type)}: {target_id_html}</td></tr>
                <tr><th>Created by</th><td>{html.escape(job.get("created_by_display_name") or job.get("created_by_username") or "")}</td></tr>
                <tr><th>Created at</th><td>{html.escape(job.get("created_at", "") or "")}</td></tr>
                <tr><th>Started at</th><td>{html.escape(job.get("started_at", "") or "")}</td></tr>
                <tr><th>Finished at</th><td>{html.escape(job.get("finished_at", "") or "")}</td></tr>
                <tr><th>Duration</th><td>{duration}</td></tr>
                <tr><th>Worker</th><td>{html.escape(job.get("worker_id", "") or "")}</td></tr>
            </table>
        </div>

        <div class="grid">
            <div class="card">
                <h2>Payload</h2>
                <pre class="log-viewer log-stdout">{payload}</pre>
            </div>
            <div class="card">
                <h2>Result / error</h2>
                <pre class="log-viewer log-stdout">{result}</pre>
                <pre class="log-viewer log-stderr">{error_text}</pre>
            </div>
        </div>

        <div class="card">
            <h2>Logy</h2>
            {log_blocks}
        </div>
        """,
        user=user,
    )


@router.post("/jobs/{job_id}/retry")
def retry_job_action(job_id: int, user=Depends(require_user)):
    job = get_job(job_id)
    if not job:
        raise HTTPException(status_code=404, detail="Job not found")
    if (job.get("status") or "").lower() != "failed":
        raise HTTPException(status_code=400, detail="Only failed jobs can be retried")

    new_job_id = retry_failed_job(job_id, user)
    if not new_job_id:
        raise HTTPException(status_code=409, detail="Job can no longer be retried")

    log_audit_event(
        user,
        action="job.retry",
        target_type="job",
        target_id=job_id,
        metadata={"new_job_id": new_job_id},
    )

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


@router.post("/jobs/{job_id}/cancel")
def cancel_job_action(job_id: int, user=Depends(require_user)):
    job = get_job(job_id)
    if not job:
        raise HTTPException(status_code=404, detail="Job not found")

    status_value = (job.get("status") or "").lower()
    if status_value not in {"queued", "running"}:
        raise HTTPException(status_code=400, detail="Only queued or running jobs can be cancelled")

    result = cancel_job(job_id)
    if not result:
        raise HTTPException(status_code=409, detail="Job can no longer be cancelled")

    log_audit_event(
        user,
        action="job.cancel",
        target_type="job",
        target_id=job_id,
        metadata=result,
    )

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