import {
  readUrlHealthFromStorage,
  removeUrlHealthFromStorage,
  writeUrlHealthToStorage,
} from "../utils/storage.js";

const PROFILE_CACHE_STORAGE_KEY = "bitvid:profileCache:v1";
const PROFILE_CACHE_VERSION = 1;
const PROFILE_CACHE_TTL_MS = 10 * 60 * 1000; // 10 minutes

const SAVED_PROFILES_STORAGE_KEY = "bitvid:savedProfiles:v1";
const SAVED_PROFILES_STORAGE_VERSION = 1;

const URL_HEALTH_TTL_MS = 45 * 60 * 1000; // 45 minutes
const URL_HEALTH_TIMEOUT_RETRY_MS = 5 * 60 * 1000; // 5 minutes
export const URL_PROBE_TIMEOUT_MS = 8 * 1000; // 8 seconds
const URL_PROBE_TIMEOUT_RETRY_MS = 15 * 1000; // 15 seconds

const HEX64_REGEX = /^[0-9a-f]{64}$/i;

function sanitizeProfileString(value) {
  if (typeof value !== "string") {
    return "";
  }

  const trimmed = value.trim();
  return trimmed;
}

let savedProfiles = [];
let activeProfilePubkey = null;
const profileCache = new Map();
const urlHealthCache = new Map();
const urlHealthInFlight = new Map();

function hasSavedProfilesChanged(previousProfiles, nextProfiles) {
  if (previousProfiles === nextProfiles) {
    return false;
  }
  if (!Array.isArray(previousProfiles) || !Array.isArray(nextProfiles)) {
    return true;
  }
  if (previousProfiles.length !== nextProfiles.length) {
    return true;
  }

  for (let index = 0; index < previousProfiles.length; index += 1) {
    const prev = previousProfiles[index];
    const next = nextProfiles[index];
    if (prev === next) {
      continue;
    }
    if (!prev || !next || typeof prev !== "object" || typeof next !== "object") {
      return true;
    }

    const keys = new Set([...Object.keys(prev), ...Object.keys(next)]);
    for (const key of keys) {
      if (prev[key] !== next[key]) {
        return true;
      }
    }
  }

  return false;
}

function safeDecodeNpub(npub) {
  if (typeof npub !== "string") {
    return null;
  }

  const trimmed = npub.trim();
  if (!trimmed) {
    return null;
  }

  try {
    const decoded = window?.NostrTools?.nip19?.decode(trimmed);
    if (decoded && decoded.type === "npub" && typeof decoded.data === "string") {
      return decoded.data;
    }
  } catch (error) {
    return null;
  }

  return null;
}

function normalizeHexPubkey(pubkey) {
  if (typeof pubkey !== "string") {
    return null;
  }

  const trimmed = pubkey.trim();
  if (!trimmed) {
    return null;
  }

  if (HEX64_REGEX.test(trimmed)) {
    return trimmed.toLowerCase();
  }

  if (trimmed.startsWith("npub1")) {
    const decoded = safeDecodeNpub(trimmed);
    if (decoded && HEX64_REGEX.test(decoded)) {
      return decoded.toLowerCase();
    }
  }

  return null;
}

export function getSavedProfiles() {
  return savedProfiles;
}

export function getProfileCacheMap() {
  return profileCache;
}

export function getActiveProfilePubkey() {
  return activeProfilePubkey;
}

export function setActiveProfilePubkey(pubkey, { persist = true } = {}) {
  const normalized = normalizeHexPubkey(pubkey);
  const nextValue =
    normalized || (typeof pubkey === "string" && pubkey.trim() ? pubkey.trim() : null);
  if (activeProfilePubkey === nextValue) {
    if (persist) {
      persistSavedProfiles({ persistActive: true });
    }
    return activeProfilePubkey;
  }

  activeProfilePubkey = nextValue;
  if (persist) {
    persistSavedProfiles({ persistActive: true });
  }
  return activeProfilePubkey;
}

export function mutateSavedProfiles(mutator, { persist = true, persistActive = true } = {}) {
  if (typeof mutator !== "function") {
    return { changed: false, profiles: getSavedProfiles() };
  }

  const draft = savedProfiles.slice();
  const result = mutator(draft);
  const nextProfiles = Array.isArray(result) ? result : draft;
  const changed = hasSavedProfilesChanged(savedProfiles, nextProfiles);

  if (changed) {
    savedProfiles = nextProfiles;
    if (persist) {
      persistSavedProfiles({ persistActive });
    }
  } else if (persist && persistActive === false) {
    persistSavedProfiles({ persistActive: false });
  }

  return { changed, profiles: getSavedProfiles() };
}

export function setSavedProfiles(nextProfiles, options) {
  return mutateSavedProfiles(
    () => (Array.isArray(nextProfiles) ? nextProfiles.slice() : []),
    options
  );
}

export function readSavedProfilesPayloadFromStorage() {
  if (typeof localStorage === "undefined") {
    return null;
  }

  const raw = localStorage.getItem(SAVED_PROFILES_STORAGE_KEY);
  if (!raw) {
    return null;
  }

  try {
    const parsed = JSON.parse(raw);
    if (!parsed || typeof parsed !== "object") {
      return null;
    }
    return parsed;
  } catch (error) {
    console.warn(
      "[cache.readSavedProfilesPayloadFromStorage] Failed to parse payload:",
      error
    );
    return null;
  }
}

function writeSavedProfilesPayloadToStorage(payload) {
  if (typeof localStorage === "undefined") {
    return;
  }

  try {
    localStorage.setItem(SAVED_PROFILES_STORAGE_KEY, JSON.stringify(payload));
  } catch (error) {
    const isQuotaError =
      error &&
      (error.name === "QuotaExceededError" ||
        error.name === "NS_ERROR_DOM_QUOTA_REACHED" ||
        error.code === 22 ||
        error.code === 1014);
    if (isQuotaError) {
      console.warn(
        "[cache.writeSavedProfilesPayloadToStorage] Storage quota exceeded; keeping in-memory copy only.",
        error
      );
    } else {
      console.warn(
        "[cache.writeSavedProfilesPayloadToStorage] Failed to persist saved profiles:",
        error
      );
    }
  }
}

export function persistSavedProfiles({ persistActive = true } = {}) {
  if (typeof localStorage === "undefined") {
    return;
  }

  if (!savedProfiles.length && !activeProfilePubkey) {
    try {
      localStorage.removeItem(SAVED_PROFILES_STORAGE_KEY);
    } catch (error) {
      console.warn(
        "[cache.persistSavedProfiles] Failed to remove empty payload:",
        error
      );
    }
    return;
  }

  let activePubkeyToPersist = activeProfilePubkey || null;
  if (!persistActive) {
    const storedPayload = readSavedProfilesPayloadFromStorage();
    if (storedPayload && typeof storedPayload === "object") {
      const candidate =
        typeof storedPayload.activePubkey === "string"
          ? storedPayload.activePubkey
          : typeof storedPayload.activePubKey === "string"
          ? storedPayload.activePubKey
          : null;
      const normalizedStored = normalizeHexPubkey(candidate);
      if (normalizedStored) {
        activePubkeyToPersist = normalizedStored;
      } else if (candidate === null) {
        activePubkeyToPersist = null;
      }
    }
  }

  const payload = {
    version: SAVED_PROFILES_STORAGE_VERSION,
    entries: savedProfiles.map((entry) => ({
      pubkey: entry.pubkey,
      npub:
        typeof entry.npub === "string" && entry.npub.trim() ? entry.npub.trim() : null,
      name: typeof entry.name === "string" ? entry.name : "",
      picture: typeof entry.picture === "string" ? entry.picture : "",
      authType: entry.authType === "nsec" ? "nsec" : "nip07",
    })),
    activePubkey: activePubkeyToPersist,
  };

  writeSavedProfilesPayloadToStorage(payload);
}

export function loadSavedProfilesFromStorage() {
  savedProfiles = [];
  activeProfilePubkey = null;

  if (typeof localStorage === "undefined") {
    return { profiles: getSavedProfiles(), activePubkey: activeProfilePubkey };
  }

  const raw = localStorage.getItem(SAVED_PROFILES_STORAGE_KEY);
  if (!raw) {
    return { profiles: getSavedProfiles(), activePubkey: activeProfilePubkey };
  }

  let needsRewrite = false;
  try {
    const parsed = JSON.parse(raw);
    if (parsed && typeof parsed === "object" && parsed.version === SAVED_PROFILES_STORAGE_VERSION) {
      const entries = Array.isArray(parsed.entries) ? parsed.entries : [];
      const seenPubkeys = new Set();
      for (const candidate of entries) {
        if (!candidate || typeof candidate !== "object") {
          continue;
        }

        const normalizedPubkey = normalizeHexPubkey(candidate.pubkey);
        if (!normalizedPubkey || seenPubkeys.has(normalizedPubkey)) {
          needsRewrite = true;
          continue;
        }

        seenPubkeys.add(normalizedPubkey);
        const storedAuthType = candidate.authType === "nsec" ? "nsec" : "nip07";
        const npub =
          typeof candidate.npub === "string" && candidate.npub.trim()
            ? candidate.npub.trim()
            : null;

        const entry = {
          pubkey: normalizedPubkey,
          npub,
          name: typeof candidate.name === "string" ? candidate.name : "",
          picture: typeof candidate.picture === "string" ? candidate.picture : "",
          authType: storedAuthType,
        };

        if (
          typeof candidate.npub === "string" && candidate.npub.trim() !== candidate.npub
        ) {
          needsRewrite = true;
        }

        if (entry.npub && typeof candidate.npub !== "string" && entry.npub !== candidate.npub) {
          needsRewrite = true;
        }

        savedProfiles.push(entry);
      }

      const activeCandidate =
        typeof parsed.activePubkey === "string"
          ? parsed.activePubkey
          : typeof parsed.activePubKey === "string"
          ? parsed.activePubKey
          : null;
      const normalizedActive = normalizeHexPubkey(activeCandidate);
      if (normalizedActive && seenPubkeys.has(normalizedActive)) {
        activeProfilePubkey = normalizedActive;
      } else if (activeCandidate) {
        needsRewrite = true;
      }
    } else if (raw) {
      needsRewrite = true;
    }
  } catch (error) {
    console.warn("[cache.loadSavedProfilesFromStorage] Failed to parse payload:", error);
    needsRewrite = true;
  }

  if (!activeProfilePubkey && savedProfiles.length) {
    activeProfilePubkey = savedProfiles[0].pubkey;
    needsRewrite = true;
  }

  if (needsRewrite) {
    persistSavedProfiles();
  }

  return { profiles: getSavedProfiles(), activePubkey: activeProfilePubkey };
}

export function syncSavedProfileFromCache(pubkey, { persist = false } = {}) {
  const normalized = normalizeHexPubkey(pubkey);
  if (!normalized) {
    return false;
  }

  const cacheEntry = profileCache.get(normalized);
  if (!cacheEntry || typeof cacheEntry !== "object") {
    return false;
  }

  let updated = false;
  mutateSavedProfiles((profiles) => {
    const next = profiles.slice();
    const index = next.findIndex((entry) => entry && entry.pubkey === normalized);
    if (index < 0) {
      return profiles;
    }

    const existing = next[index] || {};
    const profile = cacheEntry.profile || {};
    const nextEntry = {
      ...existing,
      name: profile.name || existing.name || "",
      picture: profile.picture || existing.picture || "",
    };

    if (
      existing.name === nextEntry.name &&
      existing.picture === nextEntry.picture
    ) {
      return profiles;
    }

    next[index] = nextEntry;
    updated = true;
    return next;
  }, { persist, persistActive: false });

  return updated;
}

export function loadProfileCacheFromStorage() {
  if (typeof localStorage === "undefined") {
    return;
  }

  const now = Date.now();
  const raw = localStorage.getItem(PROFILE_CACHE_STORAGE_KEY);
  if (!raw) {
    return;
  }

  try {
    const parsed = JSON.parse(raw);
    if (!parsed || typeof parsed !== "object") {
      return;
    }

    if (parsed.version !== PROFILE_CACHE_VERSION) {
      return;
    }

    const entries = parsed.entries;
    if (!entries || typeof entries !== "object") {
      return;
    }

    for (const [pubkey, entry] of Object.entries(entries)) {
      if (!pubkey || !entry || typeof entry !== "object") {
        continue;
      }

      const timestamp = typeof entry.timestamp === "number" ? entry.timestamp : 0;
      if (!timestamp || now - timestamp > PROFILE_CACHE_TTL_MS) {
        continue;
      }

      const profile = entry.profile;
      if (!profile || typeof profile !== "object") {
        continue;
      }

      const normalized = {
        name: profile.name || profile.display_name || "Unknown",
        picture: profile.picture || "assets/svg/default-profile.svg",
      };

      const about = sanitizeProfileString(profile.about || profile.aboutMe);
      if (about) {
        normalized.about = about;
      }

      const website = sanitizeProfileString(profile.website || profile.url);
      if (website) {
        normalized.website = website;
      }

      const banner = sanitizeProfileString(profile.banner || profile.header);
      if (banner) {
        normalized.banner = banner;
      }

      const lud16 = sanitizeProfileString(profile.lud16);
      if (lud16) {
        normalized.lud16 = lud16;
      }

      const lud06 = sanitizeProfileString(profile.lud06);
      if (lud06) {
        normalized.lud06 = lud06;
      }

      const lightningCandidates = [
        sanitizeProfileString(profile.lightningAddress),
        lud16,
        lud06,
      ].filter(Boolean);
      if (lightningCandidates.length) {
        normalized.lightningAddress = lightningCandidates[0];
      }

      profileCache.set(pubkey, {
        profile: normalized,
        timestamp,
      });
    }
  } catch (error) {
    console.warn("[cache.loadProfileCacheFromStorage] Failed to parse payload:", error);
  }
}

export function persistProfileCacheToStorage() {
  if (typeof localStorage === "undefined") {
    return;
  }

  const now = Date.now();
  const entries = {};

  for (const [pubkey, entry] of profileCache.entries()) {
    if (!entry || typeof entry !== "object") {
      continue;
    }

    const timestamp = typeof entry.timestamp === "number" ? entry.timestamp : 0;
    if (!timestamp || now - timestamp > PROFILE_CACHE_TTL_MS) {
      profileCache.delete(pubkey);
      continue;
    }

    entries[pubkey] = {
      profile: entry.profile,
      timestamp,
    };
  }

  const payload = {
    version: PROFILE_CACHE_VERSION,
    savedAt: now,
    entries,
  };

  if (Object.keys(entries).length === 0) {
    try {
      localStorage.removeItem(PROFILE_CACHE_STORAGE_KEY);
    } catch (error) {
      console.warn(
        "[cache.persistProfileCacheToStorage] Failed to clear storage:",
        error
      );
    }
    return;
  }

  try {
    localStorage.setItem(PROFILE_CACHE_STORAGE_KEY, JSON.stringify(payload));
  } catch (error) {
    console.warn("[cache.persistProfileCacheToStorage] Failed to persist cache:", error);
  }
}

export function getProfileCacheEntry(pubkey) {
  const normalized = normalizeHexPubkey(pubkey);
  if (!normalized) {
    return null;
  }

  const entry = profileCache.get(normalized);
  if (!entry) {
    return null;
  }

  const timestamp = typeof entry.timestamp === "number" ? entry.timestamp : 0;
  if (!timestamp || Date.now() - timestamp > PROFILE_CACHE_TTL_MS) {
    profileCache.delete(normalized);
    persistProfileCacheToStorage();
    return null;
  }

  return entry;
}

export function setProfileCacheEntry(pubkey, profile, { persist = true } = {}) {
  const normalizedPubkey = normalizeHexPubkey(pubkey);
  if (!normalizedPubkey || !profile) {
    return null;
  }

  const normalized = {
    name: profile.name || profile.display_name || "Unknown",
    picture: profile.picture || "assets/svg/default-profile.svg",
  };

  const about = sanitizeProfileString(profile.about || profile.aboutMe);
  if (about) {
    normalized.about = about;
  }

  const website = sanitizeProfileString(profile.website || profile.url);
  if (website) {
    normalized.website = website;
  }

  const banner = sanitizeProfileString(profile.banner || profile.header);
  if (banner) {
    normalized.banner = banner;
  }

  const lud16 = sanitizeProfileString(profile.lud16);
  if (lud16) {
    normalized.lud16 = lud16;
  }

  const lud06 = sanitizeProfileString(profile.lud06);
  if (lud06) {
    normalized.lud06 = lud06;
  }

  const lightningCandidates = [
    sanitizeProfileString(profile.lightningAddress),
    lud16,
    lud06,
  ].filter(Boolean);
  if (lightningCandidates.length) {
    normalized.lightningAddress = lightningCandidates[0];
  }

  const entry = {
    profile: normalized,
    timestamp: Date.now(),
  };

  profileCache.set(normalizedPubkey, entry);
  if (persist) {
    persistProfileCacheToStorage();
  }

  return entry;
}

function buildUrlProbeKey(url, options = {}) {
  const trimmed = typeof url === "string" ? url : "";
  const mode = options?.confirmPlayable ? "playable" : "basic";
  return `${trimmed}::${mode}`;
}

function isUrlHealthEntryFresh(entry, url) {
  if (!entry || typeof entry !== "object") {
    return false;
  }

  const now = Date.now();
  if (typeof entry.expiresAt !== "number" || entry.expiresAt <= now) {
    return false;
  }

  if (url && entry.url && entry.url !== url) {
    return false;
  }

  return true;
}

export function getCachedUrlHealth(eventId, url) {
  if (!eventId) {
    return null;
  }

  const entry = urlHealthCache.get(eventId);
  if (isUrlHealthEntryFresh(entry, url)) {
    return entry;
  }

  if (entry) {
    urlHealthCache.delete(eventId);
  }

  const stored = readUrlHealthFromStorage(eventId);
  if (!isUrlHealthEntryFresh(stored, url)) {
    if (stored) {
      removeUrlHealthFromStorage(eventId);
    }
    return null;
  }

  urlHealthCache.set(eventId, stored);
  return stored;
}

export function storeUrlHealth(eventId, url, result, ttlMs = URL_HEALTH_TTL_MS) {
  if (!eventId) {
    return null;
  }

  const ttl = typeof ttlMs === "number" && ttlMs > 0 ? ttlMs : URL_HEALTH_TTL_MS;
  const now = Date.now();
  const entry = {
    status: result?.status || "checking",
    message: result?.message || "Checking hosted URL…",
    url: url || result?.url || "",
    expiresAt: now + ttl,
    lastCheckedAt: now,
  };
  urlHealthCache.set(eventId, entry);
  writeUrlHealthToStorage(eventId, entry);
  return entry;
}

export function setInFlightUrlProbe(eventId, url, promise, options = {}) {
  if (!eventId || !promise) {
    return;
  }

  const key = buildUrlProbeKey(url, options);
  urlHealthInFlight.set(eventId, { promise, key });
  promise.finally(() => {
    const current = urlHealthInFlight.get(eventId);
    if (current && current.promise === promise) {
      urlHealthInFlight.delete(eventId);
    }
  });
}

export function getInFlightUrlProbe(eventId, url, options = {}) {
  if (!eventId) {
    return null;
  }

  const entry = urlHealthInFlight.get(eventId);
  if (!entry) {
    return null;
  }

  const key = buildUrlProbeKey(url, options);
  if (entry.key && entry.key !== key) {
    return null;
  }

  return entry.promise;
}

export const urlHealthConstants = {
  URL_HEALTH_TTL_MS,
  URL_HEALTH_TIMEOUT_RETRY_MS,
  URL_PROBE_TIMEOUT_RETRY_MS,
};