const euro = (value) => `€${Number(value).toFixed(2)}`;

const SECTION_META = {
  "cost-floor": {
    eyebrow: "Economic Observatory · Cost Floor",
    title: "Operator liquidity",
    lede: (data) =>
      `Period ${data.period}. Minimum viable economics: platform cost, margin, and liquidity burn from ledgers.`,
  },
  "value-range": {
    eyebrow: "Economic Observatory · Value Range",
    title: "Customer value bands",
    lede: (data) =>
      `Period ${data.period}. Segment-level willingness-to-pay hypotheses above the cost floor.`,
  },
  "market-price": {
    eyebrow: "Economic Observatory · Market Price",
    title: "Competitive context",
    lede: (data) =>
      `Reviewed ${data.market_price.last_reviewed ?? "—"}. Evidence about alternatives, capabilities, and public pricing.`,
  },
};

let currentData = null;
let activeSection = "cost-floor";

function normalizeData(data) {
  const snapshot = data.snapshot ?? {};
  const active = (data.pricing_models ?? []).find((model) => model.status === "active");

  if (!data.cost_floor) {
    data.cost_floor = {
      cost_per_member: snapshot.cost_per_member ?? "0",
      monthly_total_platform_cost: snapshot.monthly_total_platform_cost ?? "0",
      active_price: active?.access_fee_amount ?? snapshot.monthly_revenue ?? "0",
      active_model_name: active?.name ?? null,
    };
  }

  if (!data.value_range) {
    data.value_range = {
      current_price_eur: active?.access_fee_amount ?? snapshot.monthly_revenue ?? "0",
      aggregate_low_eur: active?.access_fee_amount ?? "0",
      aggregate_high_eur: active?.access_fee_amount ?? "0",
      cost_per_member_eur: snapshot.cost_per_member ?? "0",
      segments: [],
      value_drivers: [],
      notes: "Value range data unavailable — restart observatory.server to load the latest API.",
    };
  }

  if (!data.market_price) {
    data.market_price = {
      alternative_count: 0,
      priced_alternative_count: 0,
      market_low_eur: null,
      market_high_eur: null,
      last_reviewed: null,
      alternatives: [],
      notes: "Market signals unavailable — restart observatory.server to load the latest API.",
    };
  }

  return data;
}

async function loadDashboard(period) {
  const query = period ? `?period=${encodeURIComponent(period)}` : "";
  const response = await fetch(`/api/dashboard${query}`);
  if (!response.ok) throw new Error("Failed to load dashboard");
  return response.json();
}

function setBadge(el, status) {
  el.textContent = status;
  el.active = status === "generating" || status === "neutral";
  el.draft = status === "burning";
}

function setSection(sectionId) {
  activeSection = sectionId;
  document.querySelectorAll(".obs-panel").forEach((panel) => {
    const active = panel.dataset.section === sectionId;
    panel.hidden = !active;
    panel.classList.toggle("obs-panel--active", active);
  });
  document.querySelectorAll("wn-sidebar-item[data-section]").forEach((item) => {
    item.active = item.dataset.section === sectionId;
  });

  const meta = SECTION_META[sectionId];
  const header = document.getElementById("page-header");
  header.eyebrow = meta.eyebrow;
  header.title = meta.title;
  if (currentData) {
    header.lede = meta.lede(currentData);
  }

  const badge = document.getElementById("liquidity-badge");
  badge.style.display = sectionId === "cost-floor" ? "" : "none";
}

function bindNavigation() {
  document.querySelectorAll("wn-sidebar-item[data-section]").forEach((item) => {
    item.addEventListener("click", () => setSection(item.dataset.section));
  });
}

function renderCostFloor(data) {
  const { snapshot, liquidity } = data;
  const cards = [
    {
      label: "Remaining budget",
      value: euro(liquidity.remaining_budget),
      sub: `${liquidity.months_tracked} months tracked`,
    },
    {
      label: "Period net liquidity",
      value: euro(snapshot.period_net_liquidity),
      sub: snapshot.liquidity_status,
    },
    {
      label: "Cost per member",
      value: euro(data.cost_floor.cost_per_member),
      sub: `Platform ${euro(data.cost_floor.monthly_total_platform_cost)} / mo`,
    },
    {
      label: "Gross margin",
      value: euro(snapshot.gross_margin),
      sub: `${snapshot.gross_margin_pct}% of gross revenue`,
    },
    {
      label: "Infrastructure / month",
      value: euro(snapshot.monthly_infrastructure_cost),
      sub: `Processing ${euro(snapshot.monthly_payment_processing_cost)}`,
    },
    {
      label: "Active price",
      value: euro(data.cost_floor.active_price),
      sub: data.cost_floor.active_model_name ?? "—",
    },
  ];

  document.getElementById("metric-grid").innerHTML = cards
    .map(
      (card) => `
      <wn-card size="sm">
        <wn-eyebrow slot="header">${card.label}</wn-eyebrow>
        <div class="obs-metric__value">${card.value}</div>
        <span slot="footer">${card.sub}</span>
      </wn-card>`
    )
    .join("");

  const initial = Number(liquidity.initial_budget);
  const remaining = Number(liquidity.remaining_budget);
  const pct = Math.max(0, Math.min(100, (remaining / initial) * 100));
  const banner = document.getElementById("budget-banner");
  document.getElementById("budget-fill").style.width = `${pct}%`;
  document.getElementById("budget-caption").textContent =
    remaining >= 0 ? "Within allocated budget" : "Over allocated budget";
  banner.variant = remaining < initial * 0.25 ? "warn" : "info";

  document.getElementById("budget-stats").innerHTML = [
    ["Initial budget", euro(initial)],
    ["Cumulative member payments (net)", euro(liquidity.cumulative_member_payments)],
    ["Cumulative infrastructure", euro(liquidity.cumulative_infrastructure_cost)],
    ["Cumulative processing", euro(liquidity.cumulative_payment_processing_cost)],
  ]
    .map(
      ([label, value]) => `
      <wn-field-row label="${label}" narrow>
        <span class="wn-field-row__value">${value}</span>
      </wn-field-row>`
    )
    .join("");

  const max = Math.max(...data.history.map((row) => Math.abs(Number(row.net_liquidity))), 1);
  document.getElementById("liquidity-chart").innerHTML = data.history
    .map((row) => {
      const value = Number(row.net_liquidity);
      const width = (Math.abs(value) / max) * 50;
      const barClass = value < 0 ? "obs-liquidity-row__bar--neg" : "obs-liquidity-row__bar--pos";
      const valueClass = value < 0 ? "obs-liquidity-row__value--neg" : "";
      return `
        <div class="obs-liquidity-row">
          <div class="obs-liquidity-row__period">${row.period}</div>
          <div class="obs-liquidity-row__bar-wrap">
            <div class="obs-liquidity-row__bar ${barClass}" style="width:${width}%"></div>
          </div>
          <div class="obs-liquidity-row__value ${valueClass}">${euro(value)}</div>
        </div>`;
    })
    .join("");

  const domains = data.infrastructure.domains?.domains ?? [];
  const servers = data.infrastructure.virtual_servers?.servers ?? [];
  const stripe = data.infrastructure.stripe?.membership ?? {};
  const payout = data.infrastructure.stripe?.payout_account ?? "payout";
  const infraItems = [
    ...domains.map(
      (d) =>
        `<wn-field-row label="${d.name}" narrow><span class="wn-field-row__value">${d.monthly_eur} EUR/mo · ${d.tld}</span></wn-field-row>`
    ),
    ...servers.map(
      (s) =>
        `<wn-field-row label="${s.name}" narrow><span class="wn-field-row__value">${s.monthly_eur} EUR/mo · since ${s.started}</span></wn-field-row>`
    ),
    `<wn-field-row label="Stripe · ${stripe.member_username ?? "member"}" narrow><span class="wn-field-row__value">${stripe.gross_monthly_eur} gross · ${stripe.fee_monthly_eur} fee · ${stripe.net_payout_monthly_eur} net to ${payout}</span></wn-field-row>`,
  ];
  document.getElementById("infra-stack").innerHTML = `<div class="obs-infra-list">${infraItems.join("")}</div>`;

  document.getElementById("history-body").innerHTML = data.history
    .map(
      (row) => `
      <tr>
        <td class="mono">${row.period}</td>
        <td class="mono">${row.active_members}</td>
        <td class="obs-num mono">${euro(row.gross_revenue)}</td>
        <td class="obs-num mono">${euro(row.infrastructure_cost)}</td>
        <td class="obs-num mono">${euro(row.payment_processing_cost)}</td>
        <td class="obs-num mono">${euro(row.net_liquidity)}</td>
      </tr>`
    )
    .join("");

  document.getElementById("pricing-body").innerHTML = data.pricing_models
    .map(
      (model) => `
      <tr>
        <td class="mono">${model.id}</td>
        <td>${model.name}</td>
        <td class="mono">${model.model_type}</td>
        <td><wn-tag>${model.status}</wn-tag></td>
      </tr>`
    )
    .join("");

  setBadge(document.getElementById("liquidity-badge"), snapshot.liquidity_status);
}

function renderValueRangeBand(low, high, current) {
  const min = Number(low);
  const max = Number(high);
  const cur = Number(current);
  const span = Math.max(max - min, 0.01);
  const curPct = Math.max(0, Math.min(100, ((cur - min) / span) * 100));
  return `
    <div class="obs-range">
      <div class="obs-range__labels">
        <span class="mono">${euro(min)}</span>
        <span class="mono obs-range__current">${euro(cur)} now</span>
        <span class="mono">${euro(max)}</span>
      </div>
      <div class="obs-range__track">
        <div class="obs-range__fill" style="width:${curPct}%"></div>
        <div class="obs-range__marker" style="left:${curPct}%"></div>
      </div>
    </div>`;
}

function renderValueRange(data) {
  const vr = data.value_range;
  document.getElementById("value-summary").innerHTML = [
    {
      label: "Current price",
      value: euro(vr.current_price_eur),
      sub: data.cost_floor.active_model_name ?? "—",
    },
    {
      label: "Aggregate band",
      value: `${euro(vr.aggregate_low_eur)} – ${euro(vr.aggregate_high_eur)}`,
      sub: `${vr.segments.length} segments`,
    },
    {
      label: "Cost per member",
      value: euro(vr.cost_per_member_eur),
      sub: "Cost floor reference",
    },
  ]
    .map(
      (card) => `
      <wn-card size="sm">
        <wn-eyebrow slot="header">${card.label}</wn-eyebrow>
        <div class="obs-metric__value obs-metric__value--sm">${card.value}</div>
        <span slot="footer">${card.sub}</span>
      </wn-card>`
    )
    .join("");

  document.getElementById("value-range-notes").textContent = vr.notes || "";
  document.getElementById("value-segments").innerHTML = vr.segments
    .map(
      (segment) => `
      <wn-card>
        <wn-eyebrow slot="header">${segment.name}</wn-eyebrow>
        <wn-tag slot="header">${segment.confidence}</wn-tag>
        ${renderValueRangeBand(segment.low_eur, segment.high_eur, vr.current_price_eur)}
        <p class="small">${segment.evidence}</p>
        <span slot="footer">Headroom ${euro(segment.headroom_to_high_eur)}</span>
        <span slot="footer">${segment.drivers.join(" · ")}</span>
      </wn-card>`
    )
    .join("");

  document.getElementById("value-drivers").innerHTML = vr.value_drivers
    .map(
      (driver) => `
      <wn-field-row label="${driver.label}" narrow>
        <span class="wn-field-row__value">${driver.note}</span>
        <span class="wn-field-row__aside">${driver.strength}</span>
      </wn-field-row>`
    )
    .join("");
}

function renderMarketPrice(data) {
  const market = data.market_price;
  const span =
    market.market_low_eur != null && market.market_high_eur != null
      ? `${euro(market.market_low_eur)} – ${euro(market.market_high_eur)}`
      : "—";

  document.getElementById("market-summary").innerHTML = [
    {
      label: "Alternatives tracked",
      value: market.alternative_count,
      sub: `${market.priced_alternative_count} with public monthly price`,
    },
    {
      label: "Priced span",
      value: span,
      sub: `Reviewed ${market.last_reviewed ?? "—"}`,
    },
    {
      label: "Coulomb list price",
      value: euro(data.value_range.current_price_eur),
      sub: data.cost_floor.active_model_name ?? "—",
    },
  ]
    .map(
      (card) => `
      <wn-card size="sm">
        <wn-eyebrow slot="header">${card.label}</wn-eyebrow>
        <div class="obs-metric__value obs-metric__value--sm">${card.value}</div>
        <span slot="footer">${card.sub}</span>
      </wn-card>`
    )
    .join("");

  document.getElementById("market-notes").textContent = market.notes || "";
  document.getElementById("market-body").innerHTML = market.alternatives
    .map((alt) => {
      const price =
        alt.price_monthly_eur && Number(alt.price_monthly_eur) > 0
          ? euro(alt.price_monthly_eur)
          : "—";
      const features = (alt.features ?? []).join(", ");
      return `
      <tr>
        <td><strong>${alt.name}</strong><div class="small mono">${alt.id}</div></td>
        <td><wn-tag>${alt.category}</wn-tag></td>
        <td class="obs-num mono">${price}</td>
        <td><wn-stage-dot level="${alt.signal_level}">${alt.signal_level}</wn-stage-dot></td>
        <td>${features}</td>
        <td class="small">${alt.source} · ${alt.observed}<br>${alt.note}</td>
      </tr>`;
    })
    .join("");
}

function populatePeriods(history, current) {
  const select = document.getElementById("period-select");
  select.innerHTML = [...history].reverse().map(
    (row) => `<option value="${row.period}" ${row.period === current ? "selected" : ""}>${row.period}</option>`
  );
  select.value = current;
  if (!select._obsBound) {
    select.addEventListener("wn-change", async (event) => {
      const next = await loadDashboard(event.detail.value);
      render(next);
    });
    select._obsBound = true;
  }
}

async function loadDesignRefLabel() {
  try {
    const response = await fetch("/ui/vendor/whynot-design/.whynot-design-ref");
    if (!response.ok) return;
    const ref = (await response.text()).trim().slice(0, 7);
    const label = document.getElementById("design-ref-label");
    if (label && ref) label.textContent = `whynot-design @ ${ref}`;
  } catch {
    // optional footer detail
  }
}

function render(data) {
  currentData = normalizeData(data);
  document.getElementById("design-link").href = data.design_reference;
  loadDesignRefLabel();
  setSection(activeSection);
  renderCostFloor(data);
  renderValueRange(data);
  renderMarketPrice(data);
  populatePeriods(data.history, data.period);
}

bindNavigation();

loadDashboard()
  .then(render)
  .catch((error) => {
    document.body.innerHTML = `<main class="wn-main"><wn-banner variant="error" title="Load failed">${error}</wn-banner></main>`;
  });