package com.goi.erp.controller;

import com.goi.erp.common.permission.PermissionChecker;
import com.goi.erp.common.permission.PermissionSet;
import com.goi.erp.dto.CustomerRequestDto;
import com.goi.erp.dto.CustomerResponseDto;
import com.goi.erp.service.CustomerService;
import com.goi.erp.token.PermissionAuthenticationToken;

import lombok.RequiredArgsConstructor;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.domain.Page;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.*;

import java.util.UUID;

@RestController
@RequestMapping("/customer")
@RequiredArgsConstructor
public class CustomerController {
	@Value("${pagination.default-page:0}")
	private int defaultPage;

	@Value("${pagination.default-size:20}")
	private int defaultSize;

	@Value("${pagination.max-size:100}")
	private int maxSize;

    private final CustomerService customerService;

    // CREATE
    @PostMapping
    public ResponseEntity<CustomerResponseDto> createCustomer(@RequestBody CustomerRequestDto requestDto) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canCreateCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}

        CustomerResponseDto responseDto = customerService.createCustomer(requestDto);
        return new ResponseEntity<>(responseDto, HttpStatus.CREATED);
    }

    // READ ALL
    @GetMapping
    public ResponseEntity<Page<CustomerResponseDto>> getAllCustomers(
		@RequestParam(required = false) Integer page,
        @RequestParam(required = false) Integer size
    ) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canReadCRMAll(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
        
        //
        int p = (page == null) ? defaultPage : page;
        int s = (size == null) ? defaultSize : size;
        if (s > maxSize) s = maxSize;
        
        //
        return ResponseEntity.ok(customerService.getAllCustomers(p, s));
    }

    // READ ONE
    @GetMapping("/uuid/{uuid}")
    public ResponseEntity<CustomerResponseDto> getCustomer(@PathVariable UUID uuid) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canReadCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
        
        return ResponseEntity.ok(customerService.getCustomerByUuid(uuid));
    }

    // UPDATE
    @PatchMapping("/uuid/{uuid}")
    public ResponseEntity<CustomerResponseDto> updateCustomer(
            @PathVariable UUID uuid,
            @RequestBody CustomerRequestDto requestDto) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canUpdateCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
        
        return ResponseEntity.ok(customerService.updateCustomer(uuid, requestDto));
    }

    // DELETE
    @DeleteMapping("/uuid/{uuid}")
    public ResponseEntity<Void> deleteCustomer(@PathVariable UUID uuid) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canDeleteCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
        
        customerService.deleteCustomer(uuid);
        return ResponseEntity.noContent().build();
    }
    
    // from MIS
    @GetMapping("/no/{cusNo}")
    public ResponseEntity<CustomerResponseDto> getCustomer(@PathVariable String cusNo) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canDeleteCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
    	
		//
        CustomerResponseDto customer = customerService.getCustomerByNo(cusNo);
        return ResponseEntity.ok(customer);
    }

    @PatchMapping("/no/{cusNo}")
    public ResponseEntity<CustomerResponseDto> updateCustomer(@PathVariable String cusNo,
                                                              @RequestBody CustomerRequestDto dto) {
    	// 권한 체크
    	PermissionAuthenticationToken auth = (PermissionAuthenticationToken) SecurityContextHolder.getContext().getAuthentication();

		if (auth == null || auth.getPermissionSet() == null) {
		    throw new AccessDeniedException("Permission information is missing");
		}

		PermissionSet permissionSet = auth.getPermissionSet();
		if (!PermissionChecker.canDeleteCRM(permissionSet)) {
		    throw new AccessDeniedException("You do not have permission to read all CRM data");
		}
    	
		//
		CustomerResponseDto updated = customerService.updateCustomerByNo(cusNo, dto);
        return ResponseEntity.ok(updated);
    }
}