"use server";
import { revalidatePath } from "next/cache";
import { setAppSetting, type AppSettings, type WhisperJavSettings, APP_SETTINGS_DEFAULTS } from "@/lib/db/appSettings";

export async function setBoolSetting(
  key: "fadeTransitions" | "purgeFilesOnDelete" | "useRecycleBin",
  value: boolean,
) {
  setAppSetting(key, value);
  revalidatePath("/");
}

export async function setTranscodeMode(value: "off" | "always" | "auto-predicate" | "auto-runtime") {
  if (value !== "off" && value !== "always" && value !== "auto-predicate" && value !== "auto-runtime") return;
  setAppSetting("transcodeMode", value);
  revalidatePath("/");
}

export async function setNumberSetting(
  key: "fadeDurationMs" | "trashRetentionDays" | "gridColumns" | "gridColumnsPortrait" | "supersededRetentionDays" | "coverPageSize",
  value: number,
) {
  if (!Number.isFinite(value)) return;
  if (key === "gridColumns" && (value < 2 || value > 4)) return;
  if (key === "gridColumnsPortrait" && (value < 4 || value > 10)) return;
  if (key === "trashRetentionDays" && value < 0) return;
  if (key === "supersededRetentionDays" && value < 0) return;
  if (key === "coverPageSize" && (value < 25 || value > 500)) return;
  setAppSetting(key, value);
  revalidatePath("/");
}

const HEX_RE = /^#[0-9a-fA-F]{6}$/;
export async function setColorSetting(
  key: "accentPrimary" | "accentSecondary",
  value: string,
) {
  const normalized = value === "" ? "" : value.toLowerCase();
  if (normalized !== "" && !HEX_RE.test(normalized)) return;
  setAppSetting(key, normalized);
  revalidatePath("/");
}

export async function setPaginationMode(value: "url" | "scroll") {
  if (value !== "url" && value !== "scroll") return;
  setAppSetting("paginationMode", value);
  revalidatePath("/");
}

export async function setSettingsLayout(value: "sidebar" | "three-column") {
  if (value !== "sidebar" && value !== "three-column") return;
  setAppSetting("settingsLayout", value);
  revalidatePath("/");
}

export async function setVideoLibraryPath(value: string) {
  setAppSetting("videoLibraryPath", value.trim());
  revalidatePath("/");
}

export async function setPartSuffixPatterns(values: string[]) {
  // Trim, drop blanks, preserve order. Validation of token grammar
  // (e.g. `{N}`, `{L}`) happens client-side; storage accepts whatever
  // the user typed so a malformed pattern doesn't silently disappear.
  const cleaned = (values ?? []).map((v) => (v ?? "").trim()).filter(Boolean);
  setAppSetting("partSuffixPatterns", cleaned);
  // Reclassify on the next video scan; trigger a rescan so the change
  // takes effect without a manual refresh.
  try {
    const { rescanVideoIndex } = await import("@/lib/video");
    await rescanVideoIndex();
  } catch (e) {
    console.error("[settings] failed to rescan video index after pattern change:", e);
  }
  revalidatePath("/");
}

export async function setWhisperJavSettings(values: Partial<WhisperJavSettings>) {
  const sanitized: WhisperJavSettings = {
    ...APP_SETTINGS_DEFAULTS.whisperjav,
    ...values,
    cliPath: typeof values.cliPath === "string" ? values.cliPath.trim() : APP_SETTINGS_DEFAULTS.whisperjav.cliPath,
  };
  // Validate enum members so a bad client payload can't poison the row.
  const QUALITIES: WhisperJavSettings["quality"][] = ["fast", "balanced", "qwen"];
  const SOURCE_LANGS: WhisperJavSettings["sourceLanguage"][] = ["japanese", "korean", "chinese", "english"];
  const OUTPUT_MODES: WhisperJavSettings["outputMode"][] = ["native", "direct-to-english"];
  const SENSITIVITIES: WhisperJavSettings["sensitivity"][] = ["conservative", "balanced", "aggressive"];
  const LOCATIONS: WhisperJavSettings["outputLocation"][] = ["beside-video", "data-folder"];
  if (!QUALITIES.includes(sanitized.quality)) sanitized.quality = "balanced";
  if (!SOURCE_LANGS.includes(sanitized.sourceLanguage)) sanitized.sourceLanguage = "japanese";
  if (!OUTPUT_MODES.includes(sanitized.outputMode)) sanitized.outputMode = "native";
  if (!SENSITIVITIES.includes(sanitized.sensitivity)) sanitized.sensitivity = "balanced";
  if (!LOCATIONS.includes(sanitized.outputLocation)) sanitized.outputLocation = "beside-video";
  sanitized.noSignature = sanitized.noSignature !== false;
  const retention = Number(sanitized.retentionDays);
  sanitized.retentionDays = Number.isFinite(retention) && retention >= 0 ? Math.floor(retention) : 30;
  setAppSetting("whisperjav", sanitized);
  revalidatePath("/");
}

export async function setSubtitleCacheLimitMb(value: number) {
  if (!Number.isFinite(value) || value < 0) return;
  setAppSetting("subtitleCacheLimitMb", Math.floor(value));
  revalidatePath("/");
}

export async function setSubtitleExtraPaths(values: string[]) {
  const seen = new Set<string>();
  const cleaned: string[] = [];
  for (const v of values) {
    const t = (v ?? "").trim();
    if (!t) continue;
    const key = t.toLowerCase();
    if (seen.has(key)) continue;
    seen.add(key);
    cleaned.push(t);
  }
  setAppSetting("subtitleExtraPaths", cleaned);
  revalidatePath("/");
}

export async function setVideoExtraPaths(values: string[]) {
  // Trim, drop blanks, dedupe (case-insensitive on Windows-friendly compare).
  const seen = new Set<string>();
  const cleaned: string[] = [];
  for (const v of values) {
    const t = (v ?? "").trim();
    if (!t) continue;
    const key = t.toLowerCase();
    if (seen.has(key)) continue;
    seen.add(key);
    cleaned.push(t);
  }
  setAppSetting("videoExtraPaths", cleaned);
  revalidatePath("/");
}

export type WritableBoolKey = Parameters<typeof setBoolSetting>[0];
export type WritableNumberKey = Parameters<typeof setNumberSetting>[0];
export type WritableColorKey = Parameters<typeof setColorSetting>[0];
export type WritableSettings = Pick<AppSettings, WritableBoolKey | WritableNumberKey | WritableColorKey>;