package controller

import (
	"bytes"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"gitlab.com/mbugroup/lti-api.git/internal/common/exportprogress"
	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	approvalDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/approvals/dto"
	"gitlab.com/mbugroup/lti-api.git/internal/modules/expenses/dto"
	service "gitlab.com/mbugroup/lti-api.git/internal/modules/expenses/services"
	validation "gitlab.com/mbugroup/lti-api.git/internal/modules/expenses/validations"
	locationDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/locations/dto"
	supplierDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/master/suppliers/dto"
	approvalutils "gitlab.com/mbugroup/lti-api.git/internal/utils/approvals"

	"github.com/gofiber/fiber/v2"
	"github.com/xuri/excelize/v2"
)

type expenseServiceStub struct {
	getAllCalls []validation.Query
}

var _ service.ExpenseService = (*expenseServiceStub)(nil)

func (s *expenseServiceStub) GetAll(_ *fiber.Ctx, params *validation.Query) ([]dto.ExpenseListDTO, int64, error) {
	callCopy := *params
	s.getAllCalls = append(s.getAllCalls, callCopy)

	switch params.Page {
	case 1:
		return []dto.ExpenseListDTO{
			buildExpenseListForControllerTest("EXP-00001"),
			buildExpenseListForControllerTest("EXP-00002"),
		}, 3, nil
	case 2:
		return []dto.ExpenseListDTO{
			buildExpenseListForControllerTest("EXP-00003"),
		}, 3, nil
	default:
		return []dto.ExpenseListDTO{}, 3, nil
	}
}

func (s *expenseServiceStub) GetOne(_ *fiber.Ctx, _ uint) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) CreateOne(_ *fiber.Ctx, _ *validation.Create) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) UpdateOne(_ *fiber.Ctx, _ *validation.Update, _ uint) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) DeleteOne(_ *fiber.Ctx, _ uint64) error {
	return nil
}

func (s *expenseServiceStub) CreateRealization(_ *fiber.Ctx, _ uint, _ *validation.CreateRealization) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) CompleteExpense(_ *fiber.Ctx, _ uint, _ *string) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) UpdateRealization(_ *fiber.Ctx, _ uint, _ *validation.UpdateRealization) (*dto.ExpenseDetailDTO, error) {
	return &dto.ExpenseDetailDTO{}, nil
}

func (s *expenseServiceStub) DeleteDocument(_ *fiber.Ctx, _ uint, _ uint64, _ bool) error {
	return nil
}

func (s *expenseServiceStub) Approval(_ *fiber.Ctx, _ *validation.ApprovalRequest, _ string) ([]dto.ExpenseDetailDTO, error) {
	return nil, nil
}

func (s *expenseServiceStub) BulkApproveToStatus(_ *fiber.Ctx, _ *validation.BulkApprovalRequest, _ approvalutils.ApprovalStep) ([]dto.ExpenseDetailDTO, error) {
	return nil, nil
}

func (s *expenseServiceStub) GetProgressRows(_ *fiber.Ctx, _ *exportprogress.Query) ([]exportprogress.Row, error) {
	return nil, nil
}

func TestExpenseControllerGetAllExportAllIgnoresRequestLimit(t *testing.T) {
	app := fiber.New()
	stub := &expenseServiceStub{}
	ctrl := NewExpenseController(stub)
	app.Get("/expenses", ctrl.GetAll)

	req := httptest.NewRequest(
		http.MethodGet,
		"/expenses?export=excel&type=all&page=9&limit=1&search=operasional",
		nil,
	)
	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("unexpected app.Test error: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != fiber.StatusOK {
		t.Fatalf("expected status 200, got %d", resp.StatusCode)
	}

	contentType := resp.Header.Get("Content-Type")
	if !strings.Contains(contentType, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet") {
		t.Fatalf("unexpected content-type: %s", contentType)
	}

	disposition := resp.Header.Get("Content-Disposition")
	if !strings.Contains(disposition, "expenses_all_") {
		t.Fatalf("unexpected content-disposition: %s", disposition)
	}

	if len(stub.getAllCalls) != 2 {
		t.Fatalf("expected 2 GetAll calls, got %d", len(stub.getAllCalls))
	}

	firstCall := stub.getAllCalls[0]
	secondCall := stub.getAllCalls[1]
	if firstCall.Page != 1 || secondCall.Page != 2 {
		t.Fatalf("expected internal paging page 1 and 2, got %d and %d", firstCall.Page, secondCall.Page)
	}
	if firstCall.Limit != expenseExcelExportFetchLimit || secondCall.Limit != expenseExcelExportFetchLimit {
		t.Fatalf("expected internal limit %d, got %d and %d", expenseExcelExportFetchLimit, firstCall.Limit, secondCall.Limit)
	}
	if firstCall.Search != "operasional" {
		t.Fatalf("expected search filter to be forwarded, got %q", firstCall.Search)
	}

	payload, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatalf("failed to read excel payload: %v", err)
	}
	file, err := excelize.OpenReader(bytes.NewReader(payload))
	if err != nil {
		t.Fatalf("failed to parse excel payload: %v", err)
	}
	defer file.Close()

	if got, _ := file.GetCellValue(expenseExportSheetName, "A1"); got != "No" {
		t.Fatalf("expected A1 header to be No, got %q", got)
	}
	if got, _ := file.GetCellValue(expenseExportSheetName, "C2"); got != "EXP-00001" {
		t.Fatalf("expected first row reference EXP-00001, got %q", got)
	}
}

func TestExpenseControllerGetAllKeepsPaginationValidationForNonExportAll(t *testing.T) {
	app := fiber.New()
	stub := &expenseServiceStub{}
	ctrl := NewExpenseController(stub)
	app.Get("/expenses", ctrl.GetAll)

	req := httptest.NewRequest(http.MethodGet, "/expenses?page=1&limit=0", nil)
	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("unexpected app.Test error: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != fiber.StatusBadRequest {
		t.Fatalf("expected status 400, got %d", resp.StatusCode)
	}
}

func TestExpenseControllerGetAllProgressExportUnchanged(t *testing.T) {
	app := fiber.New()
	stub := &expenseServiceStub{}
	ctrl := NewExpenseController(stub)
	app.Get("/expenses", ctrl.GetAll)

	req := httptest.NewRequest(
		http.MethodGet,
		"/expenses?export=excel&type=progress&start_date=2026-04-01&end_date=2026-04-22&limit=0",
		nil,
	)
	resp, err := app.Test(req)
	if err != nil {
		t.Fatalf("unexpected app.Test error: %v", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != fiber.StatusOK {
		t.Fatalf("expected status 200, got %d", resp.StatusCode)
	}
	if len(stub.getAllCalls) != 0 {
		t.Fatalf("expected list GetAll not to be called for progress export, got %d calls", len(stub.getAllCalls))
	}
}

func buildExpenseListForControllerTest(referenceNumber string) dto.ExpenseListDTO {
	approvedAction := string(entity.ApprovalActionApproved)

	return dto.ExpenseListDTO{
		ExpenseBaseDTO: dto.ExpenseBaseDTO{
			ReferenceNumber: referenceNumber,
			PoNumber:        "PO-" + strings.TrimPrefix(referenceNumber, "EXP-"),
			TransactionDate: time.Date(2026, time.April, 22, 0, 0, 0, 0, time.UTC),
			Category:        "BOP",
			Supplier: &supplierDTO.SupplierRelationDTO{
				Name: "Supplier A",
			},
			Location: &locationDTO.LocationRelationDTO{
				Name: "Farm A",
			},
		},
		GrandTotal: 1500000,
		LatestApproval: &approvalDTO.ApprovalRelationDTO{
			StepName: "Finance",
			Action:   &approvedAction,
		},
	}
}