/**
 * API Route Template
 *
 * Usage: Copy this file to create new API routes
 * 1. Replace TEMPLATE_NAME with your route name
 * 2. Implement your route handlers (GET, POST, PUT, DELETE)
 * 3. Add proper validation and error handling
 */

import { NextRequest, NextResponse } from 'next/server'
import { z } from 'zod'
import { authMiddleware } from '@/lib/auth-middleware'

// Request validation schemas
const GetRequestSchema = z.object({
  // Define query parameters
  page: z.string().optional().default('1').transform(Number),
  limit: z.string().optional().default('10').transform(Number),
  search: z.string().optional(),
})

const PostRequestSchema = z.object({
  // Define request body structure
  name: z.string().min(1, 'Name is required'),
  description: z.string().optional(),
  tags: z.array(z.string()).optional(),
})

const PutRequestSchema = z.object({
  // Define update request body
  id: z.string().min(1, 'ID is required'),
  name: z.string().min(1, 'Name is required').optional(),
  description: z.string().optional(),
})

// Type definitions
type GetParams = z.infer<typeof GetRequestSchema>
type PostBody = z.infer<typeof PostRequestSchema>
type PutBody = z.infer<typeof PutRequestSchema>

/**
 * GET /api/template-route
 * Retrieve items with pagination and filtering
 */
export async function GET(request: NextRequest) {
  try {
    // Authentication check (remove if public endpoint)
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Parse and validate query parameters
    const { searchParams } = new URL(request.url)
    const rawParams = Object.fromEntries(searchParams.entries())
    const params = GetRequestSchema.parse(rawParams)

    // Implement your business logic here
    const { page, limit, search } = params

    // Example: Database query
    // const items = await db.collection.find({
    //   ...(search && { name: { $regex: search, $options: 'i' } }),
    // })
    // .skip((page - 1) * limit)
    // .limit(limit)
    // .toArray();

    // Mock response
    const items = [
      { id: '1', name: 'Example Item 1', description: 'Description 1' },
      { id: '2', name: 'Example Item 2', description: 'Description 2' },
    ]

    return NextResponse.json({
      success: true,
      data: {
        items,
        pagination: {
          page,
          limit,
          total: items.length,
          totalPages: Math.ceil(items.length / limit),
        },
      },
    })
  } catch (error) {
    console.error('GET /api/template-route error:', error)

    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: 'Invalid query parameters', details: error.issues },
        { status: 400 }
      )
    }

    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}

/**
 * POST /api/template-route
 * Create a new item
 */
export async function POST(request: NextRequest) {
  try {
    // Authentication check
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Parse and validate request body
    const rawBody = await request.json()
    const body = PostRequestSchema.parse(rawBody)

    // Implement your business logic here
    const { name, description, tags } = body

    // Example: Database insertion
    // const newItem = await db.collection.insertOne({
    //   name,
    //   description,
    //   tags,
    //   createdBy: user.id,
    //   createdAt: new Date(),
    // });

    // Mock response
    const newItem = {
      id: 'new-item-id',
      name,
      description,
      tags,
      createdBy: user.id,
      createdAt: new Date().toISOString(),
    }

    return NextResponse.json(
      {
        success: true,
        data: newItem,
      },
      { status: 201 }
    )
  } catch (error) {
    console.error('POST /api/template-route error:', error)

    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: 'Invalid request body', details: error.issues },
        { status: 400 }
      )
    }

    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}

/**
 * PUT /api/template-route
 * Update an existing item
 */
export async function PUT(request: NextRequest) {
  try {
    // Authentication check
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    // Parse and validate request body
    const rawBody = await request.json()
    const body = PutRequestSchema.parse(rawBody)

    // Implement your business logic here
    const { id, name, description } = body

    // Example: Database update
    // const updatedItem = await db.collection.findOneAndUpdate(
    //   { _id: id, createdBy: user.id }, // Ensure user owns the item
    //   {
    //     $set: {
    //       ...(name && { name }),
    //       ...(description && { description }),
    //       updatedAt: new Date(),
    //     }
    //   },
    //   { returnDocument: 'after' }
    // );

    // if (!updatedItem.value) {
    //   return NextResponse.json(
    //     { error: 'Item not found or unauthorized' },
    //     { status: 404 }
    //   );
    // }

    // Mock response
    const updatedItem = {
      id,
      name: name || 'Existing Name',
      description: description || 'Existing Description',
      updatedAt: new Date().toISOString(),
    }

    return NextResponse.json({
      success: true,
      data: updatedItem,
    })
  } catch (error) {
    console.error('PUT /api/template-route error:', error)

    if (error instanceof z.ZodError) {
      return NextResponse.json(
        { error: 'Invalid request body', details: error.issues },
        { status: 400 }
      )
    }

    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}

/**
 * DELETE /api/template-route/[id]
 * Delete an item
 */
export async function DELETE(request: NextRequest, { params }: { params: { id: string } }) {
  try {
    // Authentication check
    const user = await authMiddleware(request)
    if (!user) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    const { id } = params

    if (!id) {
      return NextResponse.json({ error: 'ID is required' }, { status: 400 })
    }

    // Implement your business logic here
    // Example: Database deletion
    // const deletedItem = await db.collection.findOneAndDelete({
    //   _id: id,
    //   createdBy: user.id, // Ensure user owns the item
    // });

    // if (!deletedItem.value) {
    //   return NextResponse.json(
    //     { error: 'Item not found or unauthorized' },
    //     { status: 404 }
    //   );
    // }

    return NextResponse.json({
      success: true,
      message: 'Item deleted successfully',
    })
  } catch (error) {
    console.error('DELETE /api/template-route error:', error)

    return NextResponse.json({ error: 'Internal server error' }, { status: 500 })
  }
}

/**
 * Common Response Types:
 *
 * Success Response:
 * {
 *   success: true,
 *   data: any,
 *   message?: string
 * }
 *
 * Error Response:
 * {
 *   error: string,
 *   details?: any,
 *   code?: string
 * }
 *
 * Pagination Response:
 * {
 *   success: true,
 *   data: {
 *     items: any[],
 *     pagination: {
 *       page: number,
 *       limit: number,
 *       total: number,
 *       totalPages: number
 *     }
 *   }
 * }
 */