import html

from fastapi import APIRouter, Depends, 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 create_job
from app.db.migration_readiness import PREFLIGHT_SCRIPT, get_latest_preflight_job, summarize_readiness
from app.routes.jobs import render_job_status
from app.templates.layout import page

router = APIRouter()


def render_readiness_pill(ready: bool) -> str:
    if ready:
        return '<span class="pill pill-success">READY</span>'
    return '<span class="pill pill-danger">NOT READY</span>'


@router.get("/migration-readiness", response_class=HTMLResponse)
def migration_readiness_page(request: Request, user=Depends(require_user)):
    latest_job = get_latest_preflight_job()
    summary = summarize_readiness(latest_job)
    job = summary["job"]

    log_audit_event(
        user,
        action="migration_readiness.viewed",
        target_type="migration_readiness",
        target_id=PREFLIGHT_SCRIPT,
        metadata={"job_id": job.get("id") if job else None},
    )

    job_rows = '<tr><td colspan="2">Zatím není uložený žádný výsledek preflight kontroly.</td></tr>'
    if job:
        job_id = html.escape(str(job.get("id", "")))
        job_rows = f"""
            <tr><th>Úloha</th><td><a href="/portal/jobs/{job_id}">#{job_id}</a></td></tr>
            <tr><th>Stav úlohy</th><td>{render_job_status(job.get("status"))}</td></tr>
            <tr><th>Vytvořeno</th><td>{html.escape(job.get("created_at", "") or "")}</td></tr>
            <tr><th>Spuštěno</th><td>{html.escape(job.get("started_at", "") or "")}</td></tr>
            <tr><th>Dokončeno</th><td>{html.escape(job.get("finished_at", "") or "")}</td></tr>
            <tr><th>Worker</th><td>{html.escape(job.get("worker_id", "") or "")}</td></tr>
        """

    raw_output = html.escape(summary.get("raw_output") or "")
    if not raw_output:
        raw_output = "Zatím není uložený žádný log výstup."

    return page(
        "Migration Readiness",
        f"""
        <div class="card">
            <h2>Migration Readiness</h2>
            <p class="muted">Poslední výsledek maintenance skriptu {html.escape(PREFLIGHT_SCRIPT)} uložený v databázi. Stav vychází pouze z výstupu skriptu.</p>
            <form method="post" action="/portal/migration-readiness/run">
                <button type="submit">Spustit preflight kontrolu</button>
            </form>
        </div>

        <div class="stats-grid">
            <div class="stat-card {"stat-success" if summary["ready"] else "stat-danger"}"><span>Stav</span><strong>{render_readiness_pill(summary["ready"])}</strong></div>
            <div class="stat-card stat-success"><span>OK</span><strong>{html.escape(str(summary["ok_count"]))}</strong></div>
            <div class="stat-card stat-warning"><span>WARN</span><strong>{html.escape(str(summary["warn_count"]))}</strong></div>
            <div class="stat-card stat-danger"><span>FAIL</span><strong>{html.escape(str(summary["fail_count"]))}</strong></div>
        </div>

        <div class="card">
            <h2>Poslední úloha</h2>
            <table>
                {job_rows}
            </table>
        </div>

        <div class="card">
            <h2>Raw log výstup</h2>
            <pre class="log-viewer log-stdout">{raw_output}</pre>
        </div>
        """,
        user=user,
    )


@router.post("/migration-readiness/run")
def run_migration_readiness(user=Depends(require_user)):
    job_id = create_job(
        job_type="run_script",
        target_type="maintenance_script",
        target_id=PREFLIGHT_SCRIPT,
        payload={"script_name": PREFLIGHT_SCRIPT},
        user=user,
        source="portal_manual",
    )
    return RedirectResponse(url=f"/portal/jobs/{job_id}", status_code=303)