package service

import (
	"strings"
	"testing"

	"github.com/wmms/wmms/internal/model"
)

func TestUpdateDescriptionReportsWhatChanged(t *testing.T) {
	oldMaterial := &model.Material{ID: 7, Name: "轴承", Spec: "6205", Unit: "pcs", Status: "active"}
	newMaterial := &model.Material{ID: 7, Name: "轴承", Spec: "6205-2RS", Unit: "件", Status: "active"}

	got := updateDescription(newMaterial, oldMaterial)

	want := "修改物料：轴承（规格：6205 → 6205-2RS；单位：pcs → 件）"
	if got != want {
		t.Fatalf("want %q, got %q", want, got)
	}
}

func TestUpdateDescriptionWithoutChangesKeepsNameOnly(t *testing.T) {
	oldMaterial := &model.Material{ID: 7, Name: "轴承", Status: "active"}
	newMaterial := &model.Material{ID: 7, Name: "轴承", Status: "active"}

	got := updateDescription(newMaterial, oldMaterial)

	// 没有变化时不能留下一个空的括号
	if got != "修改物料：轴承" {
		t.Fatalf("unexpected description: %q", got)
	}
}

// 作废和恢复复用的也是 LogUpdate，状态变化必须写进描述，
// 否则日志里看不出这是一次作废，只会显示成普通的「修改物料」。
func TestUpdateDescriptionShowsStatusChange(t *testing.T) {
	oldMaterial := &model.Material{ID: 7, Name: "轴承", Status: "active"}
	newMaterial := &model.Material{ID: 7, Name: "轴承", Status: "obsolete"}

	got := updateDescription(newMaterial, oldMaterial)

	want := "修改物料：轴承（状态：启用 → 作废）"
	if got != want {
		t.Fatalf("want %q, got %q", want, got)
	}
}

func TestUpdateDescriptionMarksEmptyValues(t *testing.T) {
	oldMaterial := &model.Material{ID: 7, Name: "轴承", Spec: "", Status: "active"}
	newMaterial := &model.Material{ID: 7, Name: "轴承", Spec: "6205", Status: "active"}

	got := updateDescription(newMaterial, oldMaterial)

	want := "修改物料：轴承（规格：空 → 6205）"
	if got != want {
		t.Fatalf("want %q, got %q", want, got)
	}
}

// 图片 URL 往往很长，整条塞进描述会把其他变更挤没，所以只报「已更新」。
func TestUpdateDescriptionDoesNotInlineImageURL(t *testing.T) {
	longURL := "data:image/png;base64," + strings.Repeat("A", 500)
	oldMaterial := &model.Material{ID: 7, Name: "轴承", Status: "active"}
	newMaterial := &model.Material{ID: 7, Name: "轴承", Status: "active", MaterialImage: &longURL}

	got := updateDescription(newMaterial, oldMaterial)

	if got != "修改物料：轴承（物料图片：已更新）" {
		t.Fatalf("unexpected description: %q", got)
	}
	if strings.Contains(got, "base64") {
		t.Fatalf("image URL must not be inlined: %q", got)
	}
}

func TestUpdateDescriptionWithoutOldMaterialKeepsNameOnly(t *testing.T) {
	got := updateDescription(&model.Material{ID: 7, Name: "轴承"}, nil)

	if got != "修改物料：轴承" {
		t.Fatalf("unexpected description: %q", got)
	}
}

// 上层取「修改后」的物料失败时会传 nil 进来，nil 解引用会直接 panic。
func TestLogUpdateSkipsWhenMaterialIsMissing(t *testing.T) {
	err := NewMaterialLogService().LogUpdate(nil, &model.Material{ID: 7}, "tester")

	if err != nil {
		t.Fatalf("nil material should be a no-op, got: %v", err)
	}
}