import test from "node:test";
import assert from "node:assert/strict";

import {
  DEFAULT_STEP,
  FINE_STEP,
  SCRUB_DEAD_ZONE,
  SCRUB_PIXELS_PER_STEP,
  clampHighlight,
  clampStrength,
  commonFolderPrefix,
  filterLoras,
  groupByFolder,
  highlightedName,
  isScrubbing,
  moveHighlight,
  moveRow,
  newRow,
  normalizeRows,
  parseRows,
  roundStrength,
  scrubValue,
  serializeRows,
  setStrength,
  strengthOutOfRange,
  summarizeRows,
  toggleAllRows,
  toggleAllState,
  toggleTrigger,
} from "../js/shared/lora_stack.mjs";

test("strengths clamp to the UI range and round to two decimals", () => {
  assert.equal(clampStrength(50), 10);
  assert.equal(clampStrength(-50), -10);
  assert.equal(clampStrength("nonsense"), 0);
  assert.equal(roundStrength(0.12345), 0.12);
});

test("normalizeRows heals partial rows and round-trips through serialize/parse", () => {
  const rows = normalizeRows([
    { name: "styles/ink.safetensors", strength: 0.8 },
    { bogus: true },
    "not an object",
  ]);
  assert.equal(rows.length, 3);
  assert.equal(rows[0].strength_clip, 0.8, "clip strength defaults to model strength");
  assert.equal(rows[0].enabled, true);
  assert.equal(rows[1].name, "");
  const back = parseRows(serializeRows(rows));
  assert.deepEqual(back, rows);
  assert.deepEqual(parseRows("not json"), []);
});

test("row ids survive normalization so external references stay stable", () => {
  const row = newRow();
  const [kept] = normalizeRows([{ ...row, name: "a.safetensors" }]);
  assert.equal(kept.id, row.id);
});

test("moveRow reorders within bounds and ignores impossible moves", () => {
  const rows = normalizeRows([{ name: "a" }, { name: "b" }, { name: "c" }]);
  const moved = moveRow(rows, 2, -1);
  assert.deepEqual(moved.map((r) => r.name), ["a", "c", "b"]);
  assert.equal(moveRow(rows, 0, -1), rows);
  assert.equal(moveRow(rows, 2, 1), rows);
});

test("setStrength mirrors to clip only while linked", () => {
  const rows = normalizeRows([{ name: "a", strength: 1 }]);
  const linked = setStrength(rows, 0, 0.4, true);
  assert.equal(linked[0].strength_clip, 0.4);
  const split = setStrength(rows, 0, 0.4, false);
  assert.equal(split[0].strength_clip, 1);
});

test("scrubbing is inert inside the dead zone, then steps with distance", () => {
  assert.equal(scrubValue(1, SCRUB_DEAD_ZONE), 1);
  assert.equal(scrubValue(1, -SCRUB_DEAD_ZONE), 1);
  const oneStep = scrubValue(1, SCRUB_DEAD_ZONE + SCRUB_PIXELS_PER_STEP);
  assert.equal(oneStep, roundStrength(1 + DEFAULT_STEP));
  const fine = scrubValue(1, SCRUB_DEAD_ZONE + SCRUB_PIXELS_PER_STEP, true);
  assert.equal(fine, roundStrength(1 + FINE_STEP));
  assert.equal(scrubValue(9.99, 10_000), 10, "scrub clamps at the range edge");
  assert.equal(scrubValue(-9.99, -10_000), -10);
});

test("scrubbing honors a custom coarse step but Shift stays fine", () => {
  const travel = SCRUB_DEAD_ZONE + SCRUB_PIXELS_PER_STEP;
  assert.equal(scrubValue(1, travel, false, 0.25), roundStrength(1.25));
  assert.equal(scrubValue(1, travel, true, 0.25), roundStrength(1 + FINE_STEP));
  assert.equal(scrubValue(1, travel, false, 0), roundStrength(1 + DEFAULT_STEP),
    "junk steps fall back to the default");
});

test("a mostly-vertical drag is not a scrub", () => {
  assert.equal(isScrubbing(10, 4), true);
  assert.equal(isScrubbing(4, 10), false);
  assert.equal(isScrubbing(SCRUB_DEAD_ZONE, 0), false);
});

test("picker filter is a case-insensitive substring over the full list", () => {
  const names = ["styles/InkWash.safetensors", "faces/portrait.safetensors"];
  assert.deepEqual(filterLoras(names, "ink"), ["styles/InkWash.safetensors"]);
  assert.deepEqual(filterLoras(names, "  "), names);
  assert.deepEqual(filterLoras(names, "zzz"), []);
});

test("highlight wraps with arrows, clamps when the list shrinks, resolves names", () => {
  assert.equal(moveHighlight(-1, 1, 3), 0, "first ArrowDown lands on the first item");
  assert.equal(moveHighlight(-1, -1, 3), 2, "first ArrowUp lands on the last item");
  assert.equal(moveHighlight(2, 1, 3), 0, "wraps past the end");
  assert.equal(moveHighlight(0, -1, 3), 2, "wraps past the start");
  assert.equal(moveHighlight(0, 1, 0), -1, "empty list has no highlight");
  assert.equal(clampHighlight(5, 3), 2);
  assert.equal(clampHighlight(-1, 3), 0);
  assert.equal(highlightedName(["a", "b"], 1), "b");
  assert.equal(highlightedName(["a", "b"], -1), null);
});

test("trigger chips toggle in and out preserving order", () => {
  let triggers = toggleTrigger("", "ink wash");
  triggers = toggleTrigger(triggers, "brush");
  assert.equal(triggers, "ink wash, brush");
  triggers = toggleTrigger(triggers, "Ink Wash");
  assert.equal(triggers, "brush", "toggle-off matches case-insensitively");
});

test("row summary counts only named rows", () => {
  assert.equal(summarizeRows([]), "no LoRAs");
  const rows = normalizeRows([{ name: "a" }, { name: "b", enabled: false }, { name: "" }]);
  assert.equal(summarizeRows(rows), "1 / 2 on");
});

test("master toggle reports on/off/mixed and blank rows do not vote", () => {
  const mixed = normalizeRows([{ name: "a" }, { name: "b", enabled: false }, { name: "" }]);
  assert.equal(toggleAllState(mixed), "mixed");
  assert.equal(toggleAllState(normalizeRows([{ name: "a" }, { name: "" }])), "on");
  assert.equal(toggleAllState(normalizeRows([{ name: "a", enabled: false }])), "off");
  assert.equal(toggleAllState(normalizeRows([{ name: "" }])), "off");
});

test("master toggle click: mixed and off turn all on, on turns all off", () => {
  const mixed = normalizeRows([{ name: "a" }, { name: "b", enabled: false }]);
  const allOn = toggleAllRows(mixed);
  assert.equal(toggleAllState(allOn), "on");
  const allOff = toggleAllRows(allOn);
  assert.equal(toggleAllState(allOff), "off");
  assert.equal(toggleAllState(toggleAllRows(allOff)), "on");
});

test("common folder prefix strips whole segments only, never a lone file's dir", () => {
  assert.equal(
    commonFolderPrefix(["styles/wan/a.safetensors", "styles/wan/b.safetensors"]),
    "styles/wan/"
  );
  assert.equal(commonFolderPrefix(["styles/a.safetensors", "faces/b.safetensors"]), "");
  assert.equal(commonFolderPrefix(["only/one.safetensors"]), "");
  // The shared segment is also one entry's full remaining path: stop above it.
  assert.equal(commonFolderPrefix(["styles/a.safetensors", "styles/wan/b.safetensors"]), "styles/");
});

test("folder grouping buckets by top folder in first-appearance order", () => {
  const groups = groupByFolder(["root.safetensors", "styles/a", "faces/b", "styles/c"]);
  assert.deepEqual(
    groups.map((group) => [group.folder, group.names.length]),
    [["", 1], ["styles", 2], ["faces", 1]]
  );
});

test("strength range flags only real finite bounds", () => {
  assert.equal(strengthOutOfRange(1.5, { min: 0, max: 1 }), true);
  assert.equal(strengthOutOfRange(-0.5, { min: 0, max: 1 }), true);
  assert.equal(strengthOutOfRange(0.5, { min: 0, max: 1 }), false);
  assert.equal(strengthOutOfRange(5, { min: null, max: null }), false);
  assert.equal(strengthOutOfRange(5, null), false);
  assert.equal(strengthOutOfRange(0.5, { max: 1 }), false);
});

test("templateFromRows snapshots rows without ids and trims the name", async () => {
  const { templateFromRows } = await import("../js/shared/lora_stack.mjs");
  const rows = [
    { id: "r1", name: "styles/a.safetensors", strength: 0.8, strength_clip: 0.6, enabled: true, triggers: "foo" },
  ];
  const template = templateFromRows("  My Set  ", rows);
  assert.equal(template.name, "My Set");
  assert.equal(template.rows.length, 1);
  assert.equal(template.rows[0].id, undefined);
  assert.equal(template.rows[0].strength, 0.8);
  assert.equal(templateFromRows("   ", rows), null);
});

test("applyTemplate mints fresh row ids and keeps values", async () => {
  const { applyTemplate, templateFromRows } = await import("../js/shared/lora_stack.mjs");
  const template = templateFromRows("set", [
    { name: "a", strength: 0.5, strength_clip: 0.4, enabled: false, triggers: "x, y" },
  ]);
  const rows = applyTemplate(template);
  assert.equal(rows.length, 1);
  assert.ok(rows[0].id);
  assert.equal(rows[0].strength, 0.5);
  assert.equal(rows[0].enabled, false);
  assert.equal(rows[0].triggers, "x, y");
  assert.deepEqual(applyTemplate(null), []);
});

test("upsertTemplate replaces same names case-insensitively and sorts", async () => {
  const { templateFromRows, upsertTemplate } = await import("../js/shared/lora_stack.mjs");
  const a = templateFromRows("Beta", []);
  const b = templateFromRows("alpha", []);
  let list = upsertTemplate(upsertTemplate([], a), b);
  assert.deepEqual(list.map((t) => t.name), ["alpha", "Beta"]);
  const replacement = templateFromRows("BETA", [{ name: "x" }]);
  list = upsertTemplate(list, replacement);
  assert.deepEqual(list.map((t) => t.name), ["alpha", "BETA"]);
  assert.equal(list[1].rows.length, 1);
});

test("removeTemplate and parseTemplates round-trip storage", async () => {
  const { parseTemplates, removeTemplate, templateFromRows, upsertTemplate } = await import(
    "../js/shared/lora_stack.mjs"
  );
  const list = upsertTemplate([], templateFromRows("keep", [{ name: "a" }]));
  const stored = JSON.stringify(upsertTemplate(list, templateFromRows("drop", [])));
  const loaded = parseTemplates(stored);
  assert.deepEqual(loaded.map((t) => t.name), ["drop", "keep"]);
  assert.deepEqual(removeTemplate(loaded, "DROP").map((t) => t.name), ["keep"]);
  assert.deepEqual(parseTemplates("not json"), []);
  assert.deepEqual(parseTemplates('{"name":"x"}'), []);
});