import { DEFAULT_ACCOUNT_ID, normalizeAccountId } from "../../routing/session-key.js";
import {
  listSlackAccountIds,
  type ResolvedSlackAccount,
  resolveDefaultSlackAccountId,
  resolveSlackAccount,
} from "../../slack/accounts.js";
import { probeSlack } from "../../slack/probe.js";
import { sendMessageSlack } from "../../slack/send.js";
import { getChatChannelMeta } from "../registry.js";
import {
  deleteAccountFromConfigSection,
  setAccountEnabledInConfigSection,
} from "./config-helpers.js";
import { resolveSlackGroupRequireMention } from "./group-mentions.js";
import { formatPairingApproveHint } from "./helpers.js";
import { normalizeSlackMessagingTarget } from "./normalize-target.js";
import { slackOnboardingAdapter } from "./onboarding/slack.js";
import { PAIRING_APPROVED_MESSAGE } from "./pairing-message.js";
import {
  applyAccountNameToChannelSection,
  migrateBaseNameToDefaultAccount,
} from "./setup-helpers.js";
import { createSlackActions } from "./slack.actions.js";
import type { ChannelPlugin } from "./types.js";

const meta = getChatChannelMeta("slack");

export const slackPlugin: ChannelPlugin<ResolvedSlackAccount> = {
  id: "slack",
  meta: {
    ...meta,
  },
  onboarding: slackOnboardingAdapter,
  pairing: {
    idLabel: "slackUserId",
    normalizeAllowEntry: (entry) => entry.replace(/^(slack|user):/i, ""),
    notifyApproval: async ({ id }) => {
      await sendMessageSlack(`user:${id}`, PAIRING_APPROVED_MESSAGE);
    },
  },
  capabilities: {
    chatTypes: ["direct", "channel", "thread"],
    reactions: true,
    threads: true,
    media: true,
    nativeCommands: true,
  },
  streaming: {
    blockStreamingCoalesceDefaults: { minChars: 1500, idleMs: 1000 },
  },
  reload: { configPrefixes: ["channels.slack"] },
  config: {
    listAccountIds: (cfg) => listSlackAccountIds(cfg),
    resolveAccount: (cfg, accountId) => resolveSlackAccount({ cfg, accountId }),
    defaultAccountId: (cfg) => resolveDefaultSlackAccountId(cfg),
    setAccountEnabled: ({ cfg, accountId, enabled }) =>
      setAccountEnabledInConfigSection({
        cfg,
        sectionKey: "slack",
        accountId,
        enabled,
        allowTopLevel: true,
      }),
    deleteAccount: ({ cfg, accountId }) =>
      deleteAccountFromConfigSection({
        cfg,
        sectionKey: "slack",
        accountId,
        clearBaseFields: ["botToken", "appToken", "name"],
      }),
    isConfigured: (account) => Boolean(account.botToken && account.appToken),
    describeAccount: (account) => ({
      accountId: account.accountId,
      name: account.name,
      enabled: account.enabled,
      configured: Boolean(account.botToken && account.appToken),
      botTokenSource: account.botTokenSource,
      appTokenSource: account.appTokenSource,
    }),
    resolveAllowFrom: ({ cfg, accountId }) =>
      (resolveSlackAccount({ cfg, accountId }).dm?.allowFrom ?? []).map((entry) => String(entry)),
    formatAllowFrom: ({ allowFrom }) =>
      allowFrom
        .map((entry) => String(entry).trim())
        .filter(Boolean)
        .map((entry) => entry.toLowerCase()),
  },
  security: {
    resolveDmPolicy: ({ cfg, accountId, account }) => {
      const resolvedAccountId = accountId ?? account.accountId ?? DEFAULT_ACCOUNT_ID;
      const useAccountPath = Boolean(cfg.channels?.slack?.accounts?.[resolvedAccountId]);
      const allowFromPath = useAccountPath
        ? `channels.slack.accounts.${resolvedAccountId}.dm.`
        : "channels.slack.dm.";
      return {
        policy: account.dm?.policy ?? "pairing",
        allowFrom: account.dm?.allowFrom ?? [],
        allowFromPath,
        approveHint: formatPairingApproveHint("slack"),
        normalizeEntry: (raw) => raw.replace(/^(slack|user):/i, ""),
      };
    },
    collectWarnings: ({ account }) => {
      const groupPolicy = account.config.groupPolicy ?? "allowlist";
      if (groupPolicy !== "open") return [];
      const channelAllowlistConfigured =
        Boolean(account.config.channels) && Object.keys(account.config.channels ?? {}).length > 0;
      if (channelAllowlistConfigured) {
        return [
          `- Slack channels: groupPolicy="open" allows any channel not explicitly denied to trigger (mention-gated). Set channels.slack.groupPolicy="allowlist" and configure channels.slack.channels.`,
        ];
      }
      return [
        `- Slack channels: groupPolicy="open" with no channel allowlist; any channel can trigger (mention-gated). Set channels.slack.groupPolicy="allowlist" and configure channels.slack.channels.`,
      ];
    },
  },
  groups: {
    resolveRequireMention: resolveSlackGroupRequireMention,
  },
  threading: {
    resolveReplyToMode: ({ cfg, accountId }) =>
      resolveSlackAccount({ cfg, accountId }).replyToMode ?? "off",
    allowTagsWhenOff: true,
    buildToolContext: ({ cfg, accountId, context, hasRepliedRef }) => {
      const configuredReplyToMode = resolveSlackAccount({ cfg, accountId }).replyToMode ?? "off";
      const effectiveReplyToMode = context.ThreadLabel ? "all" : configuredReplyToMode;
      return {
        currentChannelId: context.To?.startsWith("channel:")
          ? context.To.slice("channel:".length)
          : undefined,
        currentThreadTs: context.ReplyToId,
        replyToMode: effectiveReplyToMode,
        hasRepliedRef,
      };
    },
  },
  messaging: {
    normalizeTarget: normalizeSlackMessagingTarget,
  },
  actions: createSlackActions(meta.id),
  setup: {
    resolveAccountId: ({ accountId }) => normalizeAccountId(accountId),
    applyAccountName: ({ cfg, accountId, name }) =>
      applyAccountNameToChannelSection({
        cfg,
        channelKey: "slack",
        accountId,
        name,
      }),
    validateInput: ({ accountId, input }) => {
      if (input.useEnv && accountId !== DEFAULT_ACCOUNT_ID) {
        return "Slack env tokens can only be used for the default account.";
      }
      if (!input.useEnv && (!input.botToken || !input.appToken)) {
        return "Slack requires --bot-token and --app-token (or --use-env).";
      }
      return null;
    },
    applyAccountConfig: ({ cfg, accountId, input }) => {
      const namedConfig = applyAccountNameToChannelSection({
        cfg,
        channelKey: "slack",
        accountId,
        name: input.name,
      });
      const next =
        accountId !== DEFAULT_ACCOUNT_ID
          ? migrateBaseNameToDefaultAccount({
              cfg: namedConfig,
              channelKey: "slack",
            })
          : namedConfig;
      if (accountId === DEFAULT_ACCOUNT_ID) {
        return {
          ...next,
          channels: {
            ...next.channels,
            slack: {
              ...next.channels?.slack,
              enabled: true,
              ...(input.useEnv
                ? {}
                : {
                    ...(input.botToken ? { botToken: input.botToken } : {}),
                    ...(input.appToken ? { appToken: input.appToken } : {}),
                  }),
            },
          },
        };
      }
      return {
        ...next,
        channels: {
          ...next.channels,
          slack: {
            ...next.channels?.slack,
            enabled: true,
            accounts: {
              ...next.channels?.slack?.accounts,
              [accountId]: {
                ...next.channels?.slack?.accounts?.[accountId],
                enabled: true,
                ...(input.botToken ? { botToken: input.botToken } : {}),
                ...(input.appToken ? { appToken: input.appToken } : {}),
              },
            },
          },
        },
      };
    },
  },
  outbound: {
    deliveryMode: "direct",
    chunker: null,
    textChunkLimit: 4000,
    resolveTarget: ({ to }) => {
      const trimmed = to?.trim();
      if (!trimmed) {
        return {
          ok: false,
          error: new Error("Delivering to Slack requires --to <channelId|user:ID|channel:ID>"),
        };
      }
      return { ok: true, to: trimmed };
    },
    sendText: async ({ to, text, accountId, deps, replyToId }) => {
      const send = deps?.sendSlack ?? sendMessageSlack;
      const result = await send(to, text, {
        threadTs: replyToId ?? undefined,
        accountId: accountId ?? undefined,
      });
      return { channel: "slack", ...result };
    },
    sendMedia: async ({ to, text, mediaUrl, accountId, deps, replyToId }) => {
      const send = deps?.sendSlack ?? sendMessageSlack;
      const result = await send(to, text, {
        mediaUrl,
        threadTs: replyToId ?? undefined,
        accountId: accountId ?? undefined,
      });
      return { channel: "slack", ...result };
    },
  },
  status: {
    defaultRuntime: {
      accountId: DEFAULT_ACCOUNT_ID,
      running: false,
      lastStartAt: null,
      lastStopAt: null,
      lastError: null,
    },
    buildChannelSummary: ({ snapshot }) => ({
      configured: snapshot.configured ?? false,
      botTokenSource: snapshot.botTokenSource ?? "none",
      appTokenSource: snapshot.appTokenSource ?? "none",
      running: snapshot.running ?? false,
      lastStartAt: snapshot.lastStartAt ?? null,
      lastStopAt: snapshot.lastStopAt ?? null,
      lastError: snapshot.lastError ?? null,
      probe: snapshot.probe,
      lastProbeAt: snapshot.lastProbeAt ?? null,
    }),
    probeAccount: async ({ account, timeoutMs }) => {
      const token = account.botToken?.trim();
      if (!token) return { ok: false, error: "missing token" };
      return await probeSlack(token, timeoutMs);
    },
    buildAccountSnapshot: ({ account, runtime, probe }) => {
      const configured = Boolean(account.botToken && account.appToken);
      return {
        accountId: account.accountId,
        name: account.name,
        enabled: account.enabled,
        configured,
        botTokenSource: account.botTokenSource,
        appTokenSource: account.appTokenSource,
        running: runtime?.running ?? false,
        lastStartAt: runtime?.lastStartAt ?? null,
        lastStopAt: runtime?.lastStopAt ?? null,
        lastError: runtime?.lastError ?? null,
        probe,
        lastInboundAt: runtime?.lastInboundAt ?? null,
        lastOutboundAt: runtime?.lastOutboundAt ?? null,
      };
    },
  },
  gateway: {
    startAccount: async (ctx) => {
      const account = ctx.account;
      const botToken = account.botToken?.trim();
      const appToken = account.appToken?.trim();
      ctx.log?.info(`[${account.accountId}] starting provider`);
      // Lazy import: the monitor pulls the reply pipeline; avoid ESM init cycles.
      const { monitorSlackProvider } = await import("../../slack/index.js");
      return monitorSlackProvider({
        botToken: botToken ?? "",
        appToken: appToken ?? "",
        accountId: account.accountId,
        config: ctx.cfg,
        runtime: ctx.runtime,
        abortSignal: ctx.abortSignal,
        mediaMaxMb: account.config.mediaMaxMb,
        slashCommand: account.config.slashCommand,
      });
    },
  },
};