import type { LegacyConfigRule } from "./legacy.shared.js";

function isRecord(value: unknown): value is Record<string, unknown> {
  return Boolean(value) && typeof value === "object" && !Array.isArray(value);
}

function hasLegacyThreadBindingTtl(value: unknown): boolean {
  return isRecord(value) && Object.prototype.hasOwnProperty.call(value, "ttlHours");
}

function hasLegacyThreadBindingTtlInAccounts(value: unknown): boolean {
  if (!isRecord(value)) {
    return false;
  }
  return Object.values(value).some((entry) =>
    hasLegacyThreadBindingTtl(isRecord(entry) ? entry.threadBindings : undefined),
  );
}

function isLegacyGatewayBindHostAlias(value: unknown): boolean {
  if (typeof value !== "string") {
    return false;
  }
  const normalized = value.trim().toLowerCase();
  if (!normalized) {
    return false;
  }
  if (
    normalized === "auto" ||
    normalized === "loopback" ||
    normalized === "lan" ||
    normalized === "tailnet" ||
    normalized === "custom"
  ) {
    return false;
  }
  return (
    normalized === "0.0.0.0" ||
    normalized === "::" ||
    normalized === "[::]" ||
    normalized === "*" ||
    normalized === "127.0.0.1" ||
    normalized === "localhost" ||
    normalized === "::1" ||
    normalized === "[::1]"
  );
}

export const LEGACY_CONFIG_RULES: LegacyConfigRule[] = [
  {
    path: ["whatsapp"],
    message: "whatsapp config moved to channels.whatsapp (auto-migrated on load).",
  },
  {
    path: ["telegram"],
    message: "telegram config moved to channels.telegram (auto-migrated on load).",
  },
  {
    path: ["discord"],
    message: "discord config moved to channels.discord (auto-migrated on load).",
  },
  {
    path: ["slack"],
    message: "slack config moved to channels.slack (auto-migrated on load).",
  },
  {
    path: ["signal"],
    message: "signal config moved to channels.signal (auto-migrated on load).",
  },
  {
    path: ["imessage"],
    message: "imessage config moved to channels.imessage (auto-migrated on load).",
  },
  {
    path: ["msteams"],
    message: "msteams config moved to channels.msteams (auto-migrated on load).",
  },
  {
    path: ["session", "threadBindings"],
    message:
      "session.threadBindings.ttlHours was renamed to session.threadBindings.idleHours (auto-migrated on load).",
    match: (value) => hasLegacyThreadBindingTtl(value),
  },
  {
    path: ["channels", "discord", "threadBindings"],
    message:
      "channels.discord.threadBindings.ttlHours was renamed to channels.discord.threadBindings.idleHours (auto-migrated on load).",
    match: (value) => hasLegacyThreadBindingTtl(value),
  },
  {
    path: ["channels", "discord", "accounts"],
    message:
      "channels.discord.accounts.<id>.threadBindings.ttlHours was renamed to channels.discord.accounts.<id>.threadBindings.idleHours (auto-migrated on load).",
    match: (value) => hasLegacyThreadBindingTtlInAccounts(value),
  },
  {
    path: ["routing", "allowFrom"],
    message:
      "routing.allowFrom was removed; use channels.whatsapp.allowFrom instead (auto-migrated on load).",
  },
  {
    path: ["routing", "bindings"],
    message: "routing.bindings was moved; use top-level bindings instead (auto-migrated on load).",
  },
  {
    path: ["routing", "agents"],
    message: "routing.agents was moved; use agents.list instead (auto-migrated on load).",
  },
  {
    path: ["routing", "defaultAgentId"],
    message:
      "routing.defaultAgentId was moved; use agents.list[].default instead (auto-migrated on load).",
  },
  {
    path: ["routing", "agentToAgent"],
    message:
      "routing.agentToAgent was moved; use tools.agentToAgent instead (auto-migrated on load).",
  },
  {
    path: ["routing", "groupChat", "requireMention"],
    message:
      'routing.groupChat.requireMention was removed; use channels.whatsapp/telegram/imessage groups defaults (e.g. channels.whatsapp.groups."*".requireMention) instead (auto-migrated on load).',
  },
  {
    path: ["routing", "groupChat", "mentionPatterns"],
    message:
      "routing.groupChat.mentionPatterns was moved; use agents.list[].groupChat.mentionPatterns or messages.groupChat.mentionPatterns instead (auto-migrated on load).",
  },
  {
    path: ["routing", "queue"],
    message: "routing.queue was moved; use messages.queue instead (auto-migrated on load).",
  },
  {
    path: ["routing", "transcribeAudio"],
    message:
      "routing.transcribeAudio was moved; use tools.media.audio.models instead (auto-migrated on load).",
  },
  {
    path: ["telegram", "requireMention"],
    message:
      'telegram.requireMention was removed; use channels.telegram.groups."*".requireMention instead (auto-migrated on load).',
  },
  {
    path: ["identity"],
    message: "identity was moved; use agents.list[].identity instead (auto-migrated on load).",
  },
  {
    path: ["agent"],
    message:
      "agent.* was moved; use agents.defaults (and tools.* for tool/elevated/exec settings) instead (auto-migrated on load).",
  },
  {
    path: ["memorySearch"],
    message:
      "top-level memorySearch was moved; use agents.defaults.memorySearch instead (auto-migrated on load).",
  },
  {
    path: ["tools", "bash"],
    message: "tools.bash was removed; use tools.exec instead (auto-migrated on load).",
  },
  {
    path: ["agent", "model"],
    message:
      "agent.model string was replaced by agents.defaults.model.primary/fallbacks and agents.defaults.models (auto-migrated on load).",
    match: (value) => typeof value === "string",
  },
  {
    path: ["agent", "imageModel"],
    message:
      "agent.imageModel string was replaced by agents.defaults.imageModel.primary/fallbacks (auto-migrated on load).",
    match: (value) => typeof value === "string",
  },
  {
    path: ["agent", "allowedModels"],
    message: "agent.allowedModels was replaced by agents.defaults.models (auto-migrated on load).",
  },
  {
    path: ["agent", "modelAliases"],
    message:
      "agent.modelAliases was replaced by agents.defaults.models.*.alias (auto-migrated on load).",
  },
  {
    path: ["agent", "modelFallbacks"],
    message:
      "agent.modelFallbacks was replaced by agents.defaults.model.fallbacks (auto-migrated on load).",
  },
  {
    path: ["agent", "imageModelFallbacks"],
    message:
      "agent.imageModelFallbacks was replaced by agents.defaults.imageModel.fallbacks (auto-migrated on load).",
  },
  {
    path: ["messages", "tts", "enabled"],
    message: "messages.tts.enabled was replaced by messages.tts.auto (auto-migrated on load).",
  },
  {
    path: ["gateway", "token"],
    message: "gateway.token is ignored; use gateway.auth.token instead (auto-migrated on load).",
  },
  {
    path: ["gateway", "bind"],
    message:
      "gateway.bind host aliases (for example 0.0.0.0/localhost) are legacy; use bind modes (lan/loopback/custom/tailnet/auto) instead (auto-migrated on load).",
    match: (value) => isLegacyGatewayBindHostAlias(value),
    requireSourceLiteral: true,
  },
  {
    path: ["heartbeat"],
    message:
      "top-level heartbeat is not a valid config path; use agents.defaults.heartbeat (cadence/target/model settings) or channels.defaults.heartbeat (showOk/showAlerts/useIndicator).",
  },
];