import { tool } from "ai";
import { z } from "zod";
import type { Payload, PayloadRequest, User } from "payload";

export const generatePayloadLocalTools = (
  payload: Payload,
  req: PayloadRequest,
  allowedCollections: string[],
) => {
  const tools: Record<string, any> = {};

  for (const collectionSlug of allowedCollections) {
    const slugKey = collectionSlug.replace(/-/g, "_");

    // 1. Read (Find) Tool
    tools[`read_${slugKey}`] = tool({
      description: `Read/Find documents from the Payload CMS collection: ${collectionSlug}`,
      parameters: z.object({
        limit: z
          .number()
          .optional()
          .describe("Number of documents to return, max 100."),
        page: z.number().optional().describe("Page number for pagination."),
        // Simple string-based query for demo purposes. For a robust implementation,
        // we'd map this to Payload's where query logic using a structured Zod schema.
        query: z
          .string()
          .optional()
          .describe("Optional text to search within the collection."),
      }),
      // @ts-expect-error - AI SDK strict mode type inference bug
      execute: async ({
        limit = 10,
        page = 1,
        query,
      }: {
        limit?: number;
        page?: number;
        query?: string;
      }) => {
        const where = query ? { id: { equals: query } } : undefined; // Placeholder logic

        return await payload.find({
          collection: collectionSlug as any,
          limit: Math.min(limit, 100),
          page,
          where,
          req, // Crucial for passing the user context and respecting access control!
        });
      },
    });

    // 2. Read by ID Tool
    tools[`read_${slugKey}_by_id`] = tool({
      description: `Get a specific document by its ID from the ${collectionSlug} collection.`,
      parameters: z.object({
        id: z
          .union([z.string(), z.number()])
          .describe("The ID of the document."),
      }),
      // @ts-expect-error - AI SDK strict mode type inference bug
      execute: async ({ id }: { id: string | number }) => {
        return await payload.findByID({
          collection: collectionSlug as any,
          id,
          req, // Enforce access control
        });
      },
    });

    // 3. Create Tool
    tools[`create_${slugKey}`] = tool({
      description: `Create a new document in the ${collectionSlug} collection.`,
      parameters: z.object({
        data: z
          .record(z.any())
          .describe("A JSON object containing the data to insert."),
      }),
      // @ts-expect-error - AI SDK strict mode type inference bug
      execute: async ({ data }: { data: Record<string, any> }) => {
        return await payload.create({
          collection: collectionSlug as any,
          data,
          req, // Enforce access control
        });
      },
    });

    // 4. Update Tool
    tools[`update_${slugKey}`] = tool({
      description: `Update an existing document in the ${collectionSlug} collection.`,
      parameters: z.object({
        id: z
          .union([z.string(), z.number()])
          .describe("The ID of the document to update."),
        data: z
          .record(z.any())
          .describe("A JSON object containing the fields to update."),
      }),
      // @ts-expect-error - AI SDK strict mode type inference bug
      execute: async ({
        id,
        data,
      }: {
        id: string | number;
        data: Record<string, any>;
      }) => {
        return await payload.update({
          collection: collectionSlug as any,
          id,
          data,
          req, // Enforce access control
        });
      },
    });

    // 5. Delete Tool
    tools[`delete_${slugKey}`] = tool({
      description: `Delete a document from the ${collectionSlug} collection by ID.`,
      parameters: z.object({
        id: z
          .union([z.string(), z.number()])
          .describe("The ID of the document to delete."),
      }),
      // @ts-expect-error - AI SDK strict mode type inference bug
      execute: async ({ id }: { id: string | number }) => {
        return await payload.delete({
          collection: collectionSlug as any,
          id,
          req, // Enforce access control
        });
      },
    });
  }

  return tools;
};