"""Streamlit entrypoint — multi-page, multi-tenant admin dashboard."""
from __future__ import annotations

import datetime as _dt
import os
import time
from collections import Counter

import streamlit as st

from gh_deepagent.dashboard.api import APIError, parse_prometheus, sum_by, total
from gh_deepagent.dashboard.auth_ui import (
    is_standalone,
    render_user_badge,
    require_login,
)


st.set_page_config(
    page_title="gh-deepagent",
    page_icon="🤖",
    layout="wide",
    initial_sidebar_state="expanded",
)


# ---------- sidebar (drawn before login so the user can change the API URL) ----------
with st.sidebar:
    st.title("🤖 gh-deepagent")
    st.caption("Admin dashboard")
    base = st.text_input(
        "API base URL",
        value=st.session_state.get("api_base") or os.getenv("DEEPAGENT_API_URL", "http://localhost:8080"),
        key="api_base_input",
        help="The gh-deepagent webhook server.",
    )
    if base != st.session_state.get("api_base"):
        st.session_state["api_base"] = base
        st.session_state.pop("_backend_probed", None)
    st.session_state.setdefault("autorefresh", True)
    st.session_state["autorefresh"] = st.toggle(
        "Auto-refresh (10s)", value=st.session_state["autorefresh"]
    )

# ---------- login gate ----------
api, user = require_login()

# Sidebar widgets that depend on being logged in.
with st.sidebar:
    st.divider()
    if is_standalone():
        st.warning("🌐 Standalone mode (no backend)")
    else:
        try:
            h = api.healthz()
            if h.get("status") == "ok":
                st.success(
                    f"✅ Healthy · queue {h.get('queue_depth', '?')} · "
                    f"DLQ {h.get('dead_letter', '?')}"
                )
            else:
                st.warning(f"⚠️ Degraded · {h}")
        except APIError as e:
            st.error(f"❌ Unreachable: {e}")
render_user_badge()


# ---------- helpers ----------

def _fmt_ts(ts):
    if not ts:
        return "—"
    return _dt.datetime.fromtimestamp(float(ts)).strftime("%Y-%m-%d %H:%M:%S")


# ---------- HOME page ----------
st.title("Overview")
if user.get("is_admin"):
    _scope = "admin (sees all)"
else:
    _n = len(user.get("installation_ids") or [])
    _scope = f"{_n} installation(s)"
st.caption(f"Signed in as **{user['login']}** — {_scope}.")

if is_standalone():
    st.info(
        "🌐 **Standalone mode** — you're signed in directly against GitHub. "
        "Job / queue / cost data lives in a backend that isn't reachable from "
        "this Space. Configure `DEEPAGENT_API_URL` in the sidebar to point at "
        "your webhook, or deploy the all-in-one demo Space for a self-contained "
        "experience."
    )
    st.subheader("Your GitHub App installations")
    iids = user.get("installation_ids") or []
    if iids:
        for iid in iids[:50]:
            st.markdown(f"- installation `#{iid}`")
    else:
        st.caption(
            "You don't have access to any installation of a configured "
            "gh-deepagent GitHub App. Install one to see your scoped data here."
        )

elif user.get("is_admin"):
    try:
        metrics = parse_prometheus(api.metrics_raw())
    except APIError as e:
        st.error(f"Failed to fetch /metrics: {e}")
        st.stop()

    def _val(name: str) -> float:
        return total(metrics.get(name, []))

    k1, k2, k3, k4, k5 = st.columns(5)
    k1.metric("Queue depth", int(_val("deepagent_queue_depth")))
    dlq = int(_val("deepagent_dlq_size"))
    k2.metric("DLQ", dlq, delta="⚠️" if dlq else None,
              delta_color="inverse" if dlq else "off")
    k3.metric("In-progress", int(_val("deepagent_jobs_in_progress")))
    k4.metric("Jobs total", int(_val("deepagent_jobs_total")))
    k5.metric("LLM spend (USD)", f"${_val('deepagent_llm_cost_usd_total'):.2f}")

    st.divider()
    c1, c2 = st.columns(2)
    with c1:
        st.subheader("Jobs by status")
        by_status = sum_by(metrics.get("deepagent_jobs_total", []), "status")
        if by_status:
            st.bar_chart(by_status, horizontal=True)
        else:
            st.info("No job activity yet.")
    with c2:
        st.subheader("Sub-agent invocations")
        by_sub = sum_by(metrics.get("deepagent_subagent_calls_total", []), "subagent")
        if by_sub:
            st.bar_chart(by_sub, horizontal=True)
        else:
            st.info("No sub-agent calls yet.")

else:
    try:
        my_jobs = api.list_jobs(limit_per_install=50)
    except APIError as e:
        st.error(f"Failed to list jobs: {e}")
        st.stop()

    statuses = Counter(j["status"] for j in my_jobs)
    k1, k2, k3, k4 = st.columns(4)
    k1.metric("Recent jobs", len(my_jobs))
    k2.metric("Running", statuses.get("running", 0) + statuses.get("pending", 0))
    k3.metric("Failed", statuses.get("failed", 0) + statuses.get("dead", 0))
    k4.metric("Succeeded", statuses.get("succeeded", 0))

    st.divider()
    st.subheader("Your recent jobs")
    if not my_jobs:
        st.info("No jobs yet for your installations. Trigger one by labeling an "
                "issue with `deepagent` or commenting `/deepagent <instruction>`.")
    else:
        import pandas as _pd
        df = _pd.DataFrame([{
            "When": _fmt_ts(j.get("created_at")),
            "Repo": j["repo"],
            "Event": j["event"],
            "Status": j["status"],
            "ID": j["id"],
        } for j in my_jobs[:50]])
        st.dataframe(df, use_container_width=True, hide_index=True)
        st.caption("Open a job by copying its ID into the **Jobs** page.")


# Auto-refresh — but not in standalone mode (nothing changes, just wastes cycles).
if not is_standalone() and st.session_state.get("autorefresh"):
    time.sleep(10)
    st.rerun()