"use node";

import { action } from "./_generated/server";
import { internal } from "./_generated/api";
import { v } from "convex/values";
import { requireAuth } from "./authGuard";

/**
 * Signed-import actions.
 *
 * The same `requireAuth` pattern used for `messageActions.send`:
 * the admin signs a canonical string with their Ed25519 key so
 * the server can prove the caller controls `actorId` before any
 * ghost is created, any message is attributed to someone, or any
 * ghost is merged into a real user. Without these signatures an
 * attacker who knows the admin's userId could spoof `actorId` and
 * piggy-back on the admin's `manage_channels` permission.
 */

export const prepareGhostsAction = action({
  args: {
    actorId: v.id("userProfiles"),
    authors: v.array(
      v.object({
        discordId: v.string(),
        username: v.string(),
        displayName: v.optional(v.string()),
        avatarUrl: v.optional(v.string()),
      }),
    ),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.array(
    v.object({
      discordId: v.string(),
      userId: v.id("userProfiles"),
      created: v.boolean(),
      isGhost: v.boolean(),
    }),
  ),
  handler: async (ctx, args): Promise<any> => {
    // Signature covers the actor + count so a replayed sig can't be
    // redirected at a larger author list.
    const canonical = `prepareGhosts:${args.actorId}:${args.authors.length}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    return await ctx.runMutation(internal.importer.ensureGhostsInternal, {
      authors: args.authors,
    });
  },
});

export const importBatchAction = action({
  args: {
    actorId: v.id("userProfiles"),
    channelId: v.id("channels"),
    messages: v.array(
      v.object({
        senderId: v.id("userProfiles"),
        ciphertext: v.string(),
        nonce: v.string(),
        signature: v.string(),
        keyVersion: v.number(),
        replyTo: v.optional(v.id("messages")),
        importedCreatedAt: v.number(),
        discordMessageId: v.string(),
      }),
    ),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.object({
    inserted: v.number(),
    skipped: v.number(),
    resolved: v.array(
      v.object({
        discordMessageId: v.string(),
        messageId: v.id("messages"),
      }),
    ),
  }),
  handler: async (ctx, args): Promise<any> => {
    const canonical = `importBatch:${args.actorId}:${args.channelId}:${args.messages.length}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    return await ctx.runMutation(internal.importer.importBatchInternal, {
      actorId: args.actorId,
      channelId: args.channelId,
      messages: args.messages,
    });
  },
});

/**
 * Merge a ghost into a real user. Paged so any ghost size is
 * supported — the client polls this in a loop until `done: true`,
 * accumulating the rewritten count, then calls `finalizeMerge`.
 */
export const mergeGhostPageAction = action({
  args: {
    actorId: v.id("userProfiles"),
    ghostUserId: v.id("userProfiles"),
    targetUserId: v.id("userProfiles"),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.object({ rewritten: v.number(), done: v.boolean() }),
  handler: async (ctx, args): Promise<any> => {
    const canonical = `mergeGhostPage:${args.actorId}:${args.ghostUserId}:${args.targetUserId}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    return await ctx.runMutation(internal.importer.mergeGhostPageInternal, {
      actorId: args.actorId,
      ghostUserId: args.ghostUserId,
      targetUserId: args.targetUserId,
    });
  },
});

/**
 * Repair-mode helper: delete a specific set of imported messages
 * by Discord snowflake. The runner calls this right before it
 * re-inserts the same rows (with their attachments) under normal
 * import flow. Capped at 100 ids per call to match the internal
 * mutation's `DELETE_BY_DISCORD_PAGE`.
 */
export const deleteImportedByDiscordIdsAction = action({
  args: {
    actorId: v.id("userProfiles"),
    channelId: v.id("channels"),
    discordMessageIds: v.array(v.string()),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.object({ deleted: v.number() }),
  handler: async (ctx, args): Promise<{ deleted: number }> => {
    const canonical = `deleteImportedByDiscordIds:${args.actorId}:${args.channelId}:${args.discordMessageIds.length}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    return await ctx.runMutation(
      internal.importer.deleteImportedByDiscordIdsInternal,
      {
        actorId: args.actorId,
        channelId: args.channelId,
        discordMessageIds: args.discordMessageIds,
      },
    );
  },
});

/**
 * Wipe every imported message in a channel. Paged so any volume
 * succeeds — the action loops over `clearChannelImportsPageInternal`
 * until it reports `done`, then writes a single audit entry. Used
 * by the Import tab's per-channel "Clear imports" button so a
 * partial earlier run can be wiped + re-imported cleanly.
 */
export const clearChannelImportsAction = action({
  args: {
    actorId: v.id("userProfiles"),
    channelId: v.id("channels"),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.object({ deleted: v.number() }),
  handler: async (ctx, args): Promise<{ deleted: number }> => {
    const canonical = `clearChannelImports:${args.actorId}:${args.channelId}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    let total = 0;
    for (;;) {
      const page: { deleted: number; done: boolean } = await ctx.runMutation(
        internal.importer.clearChannelImportsPageInternal,
        { actorId: args.actorId, channelId: args.channelId },
      );
      total += page.deleted;
      if (page.done) break;
    }
    await ctx.runMutation(internal.importer.finalizeClearImportsInternal, {
      actorId: args.actorId,
      channelId: args.channelId,
      totalDeleted: total,
    });
    return { deleted: total };
  },
});

export const finalizeMergeAction = action({
  args: {
    actorId: v.id("userProfiles"),
    ghostUserId: v.id("userProfiles"),
    targetUserId: v.id("userProfiles"),
    totalRewritten: v.number(),
    authTimestamp: v.number(),
    authSignature: v.string(),
  },
  returns: v.null(),
  handler: async (ctx, args): Promise<null> => {
    const canonical = `finalizeMerge:${args.actorId}:${args.ghostUserId}:${args.targetUserId}:${args.authTimestamp}`;
    await requireAuth(
      ctx,
      args.actorId,
      args.authTimestamp,
      args.authSignature,
      canonical,
    );
    await ctx.runMutation(internal.importer.finalizeMergeInternal, {
      actorId: args.actorId,
      ghostUserId: args.ghostUserId,
      targetUserId: args.targetUserId,
      totalRewritten: args.totalRewritten,
    });
    return null;
  },
});