// Upload view (US05-05): preflight a scope, confirm exactly what will be sent,
// watch the batch run, and resolve whatever the uploader left uncertain.
//
// Two rules shape this file. First, nothing here decides what is safe: blockers,
// the preflight token, and the retry policy all come from the server, and an action
// the server would refuse is not offered at all. Second, the API key never reaches
// the browser — preflight reports only that one is configured, and every command
// preview arrives redacted — so nothing in this view may reconstruct, store, or
// route a secret.
import { api } from "./api.js";
import { el, errorBanner, setActiveNav } from "./dom.js";
import { subscribeJob } from "./events.js";
import { navigate } from "./router.js";

// Result of the last command issued from this tab, and the activity of the last
// upload job. Deliberately not persisted: after a reload the page must show what
// the server says happened, not what this page remembers.
let outcome = null;
let activity = [];

let render = () => {};
export function setUploadsRender(fn) {
  render = fn;
}

// Report outcomes (services/upload_reports.py) in the words the operator uses.
const OUTCOME_LABEL = [
  ["uploaded", "new"],
  ["upgraded", "upgraded"],
  ["duplicate", "duplicate"],
  ["skipped", "skipped"],
  ["failed", "failed"],
  ["unknown", "uncertain"],
];

export async function renderUploads(root, params = {}) {
  setActiveNav("uploads");
  const albums = parseAlbums(params.albums);
  const allowPartial = params.partial === "1";

  let preflight, listed;
  try {
    [preflight, listed] = await Promise.all([
      api.uploadPreflight({ albums, allow_partial: allowPartial }),
      api.listUploadBatches(),
    ]);
  } catch (error) {
    root.replaceChildren(errorBanner(`Failed to load uploads: ${error.message}`));
    return;
  }

  const batches = listed.batches;
  const selectedId = params.batch || (batches.length ? batches[batches.length - 1].id : null);
  let batch = null;
  let history = [];
  if (selectedId) {
    try {
      const [detail, verifications] = await Promise.all([
        api.getUploadBatch(selectedId),
        api.uploadVerifications(selectedId),
      ]);
      batch = detail;
      history = verifications.verifications;
    } catch (error) {
      root.replaceChildren(errorBanner(`Failed to load upload batch: ${error.message}`));
      return;
    }
  }

  root.replaceChildren(
    ...[
      el("h1", {}, "Upload"),
      configurationCard(preflight),
      preflightBlockers(preflight),
      scopeSection(preflight, params, albums, allowPartial),
      confirmBlock(preflight, params, allowPartial),
      outcomeBanner(),
      activityLog(),
      batchList(batches, selectedId),
      batch ? batchDetail(batch, history) : null,
    ].filter(Boolean)
  );
}

// Album names can contain commas, so each one is escaped before the URL joins them.
function parseAlbums(value) {
  if (!value) return null;
  const names = value.split(",").filter(Boolean).map(decodeURIComponent);
  return names.length ? names : null;
}

function albumsParam(names) {
  return names.map(encodeURIComponent).join(",");
}

// ── configuration ────────────────────────────────────────────────────────────
// What the upload is aimed at, in the only form the browser is ever given: the
// server URL, whether a key exists, and the uploader's version.
function configurationCard(preflight) {
  const credentials = preflight.credentials;
  const uploader = preflight.uploader;
  return el(
    "div",
    { class: "card", "data-testid": "upload-config" },
    el("h2", {}, "Configuration"),
    el(
      "dl",
      {},
      el("dt", {}, "Immich server"),
      el("dd", { "data-testid": "config-server" }, credentials.server_url || "not configured"),
      el("dt", {}, "API key"),
      // Presence, never the value — and never a length or prefix either.
      el(
        "dd",
        { "data-testid": "config-key" },
        credentials.api_key_configured ? "configured (never shown)" : "missing"
      ),
      el("dt", {}, "Reachable"),
      el(
        "dd",
        { "data-testid": "config-reachable" },
        preflight.server.reachable ? "yes" : `no — ${preflight.server.detail || "unknown"}`
      ),
      el("dt", {}, "Uploader"),
      el(
        "dd",
        { "data-testid": "config-uploader" },
        uploader.installed ? uploader.version || "installed" : `${uploader.binary} is not installed`
      )
    )
  );
}

function preflightBlockers(preflight) {
  if (!preflight.blockers.length) return null;
  return el(
    "div",
    { class: "alert", role: "alert", "data-testid": "preflight-blockers" },
    el("strong", {}, "This scope cannot be uploaded yet"),
    el(
      "ul",
      {},
      ...preflight.blockers.map((blocker) =>
        el(
          "li",
          { "data-testid": "preflight-blocker", "data-code": blocker.code },
          `${blocker.code}: ${blocker.message}`
        )
      )
    )
  );
}

// ── scope ────────────────────────────────────────────────────────────────────
function scopeSection(preflight, params, albums, allowPartial) {
  const selected = new Set(albums || preflight.albums.map((album) => album.album));

  function toggle(name, checked) {
    const next = new Set(selected);
    if (checked) next.add(name);
    else next.delete(name);
    // An empty selection means "everything" again, which is also what an absent
    // parameter means — there is no way to preflight nothing.
    navigate("/uploads", { ...params, albums: albumsParam([...next]), batch: params.batch });
  }

  const rows = preflight.albums.map((album) =>
    el(
      "tr",
      { "data-testid": "album-row", "data-album": album.album },
      el(
        "td",
        {},
        el("input", {
          type: "checkbox",
          "data-testid": "album-selected",
          "aria-label": `Include ${album.album}`,
          checked: selected.has(album.album) ? "checked" : false,
          onchange: (event) => toggle(album.album, event.target.checked),
        })
      ),
      el("td", { "data-testid": "album-name" }, album.album),
      // What Immich will call it, which is not always what the folder is called here.
      el("td", { "data-testid": "album-immich-name" }, album.album_name),
      el("td", { class: "path", "data-testid": "album-folder" }, album.folder),
      el("td", { "data-testid": "album-eligible" }, String(album.eligible_count)),
      el("td", { "data-testid": "album-blocked" }, String(album.blocked_count)),
      el(
        "td",
        {},
        el("span", { class: `badge ${album.state}`, "data-testid": "album-state" }, album.state),
        ...album.blockers.map((blocker) =>
          el(
            "div",
            { class: "blocker", "data-testid": "album-blocker", "data-code": blocker.code },
            blocker.message
          )
        )
      ),
      // The exact invocation, as the server built it. Shown so the upload holds no
      // surprises; the key is masked at the source, not here.
      el("td", { class: "path", "data-testid": "album-command" }, album.command_preview.join(" "))
    )
  );

  const totals = preflight.totals;
  return el(
    "div",
    { "data-testid": "upload-scope" },
    el("h2", {}, "Scope"),
    el(
      "div",
      { class: "decision-bar" },
      el("span", { class: "badge", "data-testid": "total-albums" }, `${totals.albums} album(s)`),
      el("span", { class: "badge", "data-testid": "total-eligible" }, `${totals.eligible} ready`),
      totals.blocked
        ? el(
            "span",
            { class: "badge attention", "data-testid": "total-blocked" },
            `${totals.blocked} blocked`
          )
        : null,
      el(
        "label",
        {},
        el("input", {
          type: "checkbox",
          "data-testid": "allow-partial",
          checked: allowPartial ? "checked" : false,
          onchange: (event) =>
            navigate("/uploads", { ...params, partial: event.target.checked ? "1" : "" }),
        }),
        " Upload ready photos and leave the blocked ones behind"
      )
    ),
    rows.length
      ? el(
          "table",
          { class: "grid", "data-testid": "albums" },
          el(
            "thead",
            {},
            el(
              "tr",
              {},
              ...["", "Album", "Immich album", "Folder", "Ready", "Blocked", "State", "Command"].map(
                (label) => el("th", { scope: "col" }, label)
              )
            )
          ),
          el("tbody", {}, ...rows)
        )
      : el("p", { class: "muted", "data-testid": "no-albums" }, "No album is ready to upload.")
  );
}

// ── confirmation ─────────────────────────────────────────────────────────────
function confirmBlock(preflight, params, allowPartial) {
  const ready = preflight.state === "ready";
  const totals = preflight.totals;
  const albums = preflight.albums.map((album) => album.album);
  return el(
    "div",
    { class: "card", "data-testid": "confirm" },
    el("h2", {}, "Confirm"),
    // The token is shown, not merely sent: a confirmation the user cannot see is a
    // confirmation they cannot check against the preview above.
    el(
      "p",
      { class: "muted", "data-testid": "confirm-token" },
      `Preflight ${preflight.token.slice(0, 20)}… · ${allowPartial ? "partial" : "complete"} scope`
    ),
    el(
      "p",
      { "data-testid": "upload-note" },
      "Uploading is not reversible from here: Immich decides what to do with each " +
        "file, and the app can only record what it reports. One album is sent at a " +
        "time and a running album can be stopped."
    ),
    el(
      "div",
      { class: "toolbar" },
      el(
        "button",
        {
          class: "primary",
          "data-testid": "start-upload",
          disabled: ready ? false : "disabled",
          title: ready ? false : "resolve the blockers above first",
          onclick: () =>
            run(async () => {
              const created = await api.createUploadBatches({
                albums,
                token: preflight.token,
                allow_partial: allowPartial,
              });
              // One lane: the first batch starts now, the rest wait with their own
              // start buttons rather than queueing behind a lock that would reject
              // them.
              const first = created.batches.find((batch) => !batch.retry_blockers.length);
              if (!first) return { batches: created.batches.length, started: null };
              const started = await api.startUploadBatch(first.id);
              watch(started.job.id, first.id);
              return { batches: created.batches.length, started: first.album };
            }),
        },
        `Upload ${totals.albums} album(s) · ${totals.eligible} photo(s)`
      )
    )
  );
}

// ── batches ──────────────────────────────────────────────────────────────────
function batchList(batches, selectedId) {
  if (!batches.length) {
    return el("p", { class: "muted", "data-testid": "no-batches" }, "No upload has been started yet.");
  }
  return el(
    "div",
    { "data-testid": "upload-batches" },
    el("h2", {}, "Batches"),
    el(
      "table",
      { class: "grid", "data-testid": "batches" },
      el(
        "thead",
        {},
        el(
          "tr",
          {},
          ...["Album", "State", "Evidence", "Attempts", "Photos"].map((label) =>
            el("th", { scope: "col" }, label)
          )
        )
      ),
      el(
        "tbody",
        {},
        ...batches.map((batch) =>
          el(
            "tr",
            {
              "data-testid": "batch-row",
              "data-album": batch.album,
              "aria-current": batch.id === selectedId ? "true" : false,
            },
            el(
              "td",
              {},
              el("a", { class: "link", href: `#/uploads?batch=${encodeURIComponent(batch.id)}` }, batch.album)
            ),
            el(
              "td",
              {},
              el("span", { class: `badge ${batch.state}`, "data-testid": "batch-state" }, batch.state)
            ),
            el("td", { "data-testid": "batch-outcome-state" }, batch.outcome_state || "not parsed"),
            el("td", {}, String(batch.attempt_count)),
            el("td", {}, String(batch.asset_count))
          )
        )
      )
    )
  );
}

function batchDetail(batch, history) {
  // Derived from the items, not from the batch's parsed-report summary: verifying
  // or resolving an item changes what is true without re-parsing a report, and the
  // progress line must show the current answer rather than the uploader's old one.
  const counts = {};
  for (const item of batch.items) {
    const key = item.outcome || "unknown";
    counts[key] = (counts[key] || 0) + 1;
  }
  const blockers = batch.retry_blockers;
  const uncertain = batch.outcome_state === "requires_verification" || counts.unknown > 0;

  const nodes = [
    el("h2", {}, `${batch.album} — attempt ${batch.attempt_count}`),
    el(
      "div",
      { class: "decision-bar", "data-testid": "batch-progress" },
      el("span", { class: `badge ${batch.state}`, "data-testid": "detail-state" }, batch.state),
      ...OUTCOME_LABEL.map(([key, label]) =>
        el(
          "span",
          { class: `badge ${key}`, "data-testid": `count-${label}` },
          `${label}: ${counts[key] ?? 0}`
        )
      )
    ),
  ];

  if (batch.stale_bytes) {
    nodes.push(
      el(
        "div",
        { class: "alert", role: "alert", "data-testid": "stale-bytes" },
        "Files in this batch changed after they were uploaded. Immich still holds the " +
          "bytes that were sent; re-approve the album through a fresh preflight rather " +
          "than uploading the new bytes over it."
      )
    );
  }
  if (batch.error_code) {
    nodes.push(
      el(
        "div",
        { class: "alert", role: "alert", "data-testid": "batch-error" },
        `${batch.error_code}: ${batch.error_message || ""}`
      )
    );
  }
  if (uncertain) {
    nodes.push(
      el(
        "div",
        { class: "alert", role: "alert", "data-testid": "uncertain" },
        el("strong", {}, "This upload's outcome is not fully known"),
        el(
          "p",
          {},
          "The uploader's report does not account for every file. Retrying could create " +
            "a second copy of something Immich already accepted, so verify it first: the " +
            "check asks Immich whether it holds the exact bytes that were sent."
        )
      )
    );
  }

  nodes.push(
    el(
      "div",
      { class: "toolbar" },
      // A start button exists only when the server would accept one. An uncertain
      // outcome and changed bytes therefore offer verification, never a retry.
      blockers.length
        ? el(
            "div",
            { class: "blocker", "data-testid": "retry-blocked" },
            blockers.map((blocker) => `${blocker.code}: ${blocker.message}`).join("; ")
          )
        : el(
            "button",
            {
              class: "primary",
              "data-testid": "start-batch",
              onclick: () =>
                run(async () => {
                  const started = await api.startUploadBatch(batch.id);
                  watch(started.job.id, batch.id);
                  return { started: batch.album };
                }),
            },
            batch.attempt_count ? "Run this album again" : "Upload this album"
          ),
      ["planned", "running"].includes(batch.state)
        ? el(
            "button",
            {
              "data-testid": "cancel-batch",
              onclick: () => run(() => api.cancelUploadBatch(batch.id)),
            },
            batch.state === "running" ? "Stop after the current file" : "Cancel this album"
          )
        : null,
      // Offered for anything that has run, not only for uncertain outcomes:
      // re-checking is read-only and idempotent, and it is how a file edited after
      // its upload is discovered.
      batch.attempt_count
        ? el(
            "button",
            {
              "data-testid": "verify-batch",
              onclick: () => run(() => api.verifyUploadBatch(batch.id)),
            },
            "Verify against Immich"
          )
        : null
    ),
    itemsTable(batch)
  );
  if (history.length) nodes.push(historyList(history));
  return el(
    "div",
    { class: "card", "data-testid": "batch-detail", "data-batch": batch.id },
    ...nodes
  );
}

function itemsTable(batch) {
  if (!batch.items.length) {
    return el("p", { class: "muted", "data-testid": "no-items" }, "This batch has no photos.");
  }
  return el(
    "table",
    { class: "grid", "data-testid": "items" },
    el(
      "thead",
      {},
      el(
        "tr",
        {},
        ...["Photo", "Outcome", "Evidence", "Verification", "Bytes now", "Resolve"].map((label) =>
          el("th", { scope: "col" }, label)
        )
      )
    ),
    el(
      "tbody",
      {},
      ...batch.items.map((item) =>
        el(
          "tr",
          { "data-testid": "item-row", "data-asset-id": item.asset_id },
          el("td", { class: "path", "data-testid": "item-path" }, item.path),
          el(
            "td",
            {},
            el(
              "span",
              { class: `badge ${item.outcome || ""}`, "data-testid": "item-outcome" },
              item.outcome === "uploaded" ? "new" : item.outcome || "pending"
            )
          ),
          el("td", { class: "muted", "data-testid": "item-evidence" }, item.evidence || "—"),
          el("td", { "data-testid": "item-verification" }, item.verification || "—"),
          el(
            "td",
            {},
            item.changed_after_upload
              ? el("span", { class: "badge attention", "data-testid": "item-changed" }, "changed")
              : el("span", { class: "muted" }, "unchanged")
          ),
          el("td", {}, resolveForm(batch, item))
        )
      )
    )
  );
}

// Manual resolution is evidence, not permission: the note and the author are
// required by the server, so the form collects both and offers no default.
function resolveForm(batch, item) {
  const unresolved = !item.outcome || item.outcome === "unknown" || item.verification === "inconclusive";
  if (!unresolved) return el("span", { class: "muted" }, "—");

  const outcomeSelect = el(
    "select",
    { "data-testid": "resolve-outcome", "aria-label": `Outcome for ${item.path}` },
    ...OUTCOME_LABEL.map(([key, label]) => el("option", { value: key }, label))
  );
  const evidence = el("input", {
    type: "text",
    "data-testid": "resolve-evidence",
    "aria-label": `What you checked for ${item.path}`,
    placeholder: "What did you check?",
  });
  const actor = el("input", {
    type: "text",
    "data-testid": "resolve-actor",
    "aria-label": `Who checked ${item.path}`,
    placeholder: "Who are you?",
  });
  return el(
    "div",
    { class: "toolbar" },
    outcomeSelect,
    evidence,
    actor,
    el(
      "button",
      {
        "data-testid": "resolve-item",
        onclick: () =>
          run(() =>
            api.resolveUploadItem(batch.id, {
              asset_id: item.asset_id,
              outcome: outcomeSelect.value,
              evidence: evidence.value,
              actor: actor.value,
            })
          ),
      },
      "Record"
    )
  );
}

function historyList(history) {
  return el(
    "div",
    { "data-testid": "verification-history" },
    el("h3", {}, "Verification history"),
    el(
      "ul",
      {},
      ...history.map((entry) =>
        el(
          "li",
          { "data-testid": "history-entry", "data-source": entry.source },
          `${entry.created_at || ""} · ${entry.action} · ${entry.source} · ${entry.result} → ` +
            `${entry.outcome || "unresolved"} — ${entry.evidence}` +
            (entry.actor ? ` (${entry.actor})` : "")
        )
      )
    )
  );
}

// ── running commands ─────────────────────────────────────────────────────────
async function run(action) {
  try {
    outcome = { kind: "ok", result: await action() };
  } catch (error) {
    outcome = error.status === 409 ? { kind: "conflict", error } : { kind: "error", error };
  }
  render();
}

// Live job activity. Events are appended to the log node and the running batch's
// panel is refreshed on its own tick — the uploader reports per file, not per job
// event, so waiting for the next event would leave the panel behind. Only that
// panel is rebuilt: a full re-render would re-run preflight, which re-hashes the
// library, so that happens once when the job ends.
const REFRESH_MS = 1000;

function watch(jobId, batchId) {
  activity = [`Started upload job ${jobId}`];
  const tick = setInterval(() => refreshBatch(batchId), REFRESH_MS);
  subscribeJob(jobId, {
    onEvent: (event) => {
      activity.push(`${event.type}${event.message ? ": " + event.message : ""}`);
      const log = document.querySelector('[data-testid="upload-activity"]');
      if (log) log.textContent = activity.join("\n");
    },
    onDone: () => {
      clearInterval(tick);
      activity.push("done");
      render();
    },
  });
}

async function refreshBatch(batchId) {
  const node = document.querySelector(`[data-testid="batch-detail"][data-batch="${batchId}"]`);
  if (!node) return; // the user navigated away from the running batch
  try {
    const [batch, verifications] = await Promise.all([
      api.getUploadBatch(batchId),
      api.uploadVerifications(batchId),
    ]);
    node.replaceWith(batchDetail(batch, verifications.verifications));
  } catch (_) {
    // Transient: the next tick tries again, and the job's end re-renders anyway.
  }
}

function activityLog() {
  return el(
    "pre",
    {
      class: "activity-log",
      role: "status",
      "aria-live": "polite",
      "data-testid": "upload-activity",
    },
    activity.join("\n")
  );
}

function outcomeBanner() {
  if (!outcome) return null;
  if (outcome.kind === "conflict") {
    return el(
      "div",
      { class: "alert", role: "alert", "data-testid": "conflict" },
      `The server refused this: ${outcome.error.message}. Nothing was uploaded; the ` +
        "state below is the server's current one — review it and decide again."
    );
  }
  if (outcome.kind === "error") {
    return el(
      "div",
      { class: "alert", role: "alert", "data-testid": "upload-error" },
      `Failed: ${outcome.error.message}`
    );
  }
  const result = outcome.result;
  if (result && result.batches !== undefined) {
    return el(
      "div",
      { class: "alert", role: "status", "data-testid": "upload-result" },
      `Approved ${result.batches} album batch(es).` +
        (result.started ? ` Uploading ${result.started} now.` : " Nothing could be started yet.")
    );
  }
  return el(
    "div",
    { class: "alert", role: "status", "data-testid": "upload-result" },
    "Done — the state below is the server's."
  );
}