package repository_test

import (
	"errors"
	"fmt"
	"testing"
	"time"

	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
	"git.huangwc.com/pig/pig-farm-controller/internal/infra/repository"
	"github.com/stretchr/testify/assert"
	"gorm.io/gorm"
)

// createTestPlan 是一个辅助函数，用于创建测试计划。
func createTestPlan(name, description string, execType models.PlanExecutionType, contentType models.PlanContentType) models.Plan {
	return models.Plan{
		Name:          name,
		Description:   description,
		ExecutionType: execType,
		ContentType:   contentType,
	}
}

// TestListBasicPlans 测试 ListBasicPlans 方法，确保它能正确返回所有计划的基本信息。
func TestListBasicPlans(t *testing.T) {
	tests := []struct {
		name          string
		setupPlans    []models.Plan
		expectedCount int
		expectedError error
	}{
		{
			name:          "数据库中没有计划",
			setupPlans:    []models.Plan{},
			expectedCount: 0,
			expectedError: nil,
		},
		{
			name: "数据库中有多个计划",
			setupPlans: []models.Plan{
				createTestPlan("计划 A", "描述 A", models.PlanExecutionTypeAutomatic, models.PlanContentTypeTasks),
				createTestPlan("计划 B", "描述 B", models.PlanExecutionTypeManual, models.PlanContentTypeSubPlans),
			},
			expectedCount: 2,
			expectedError: nil,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			db := setupTestDB(t)
			repo := repository.NewGormPlanRepository(db)

			for i := range tt.setupPlans {
				err := db.Create(&tt.setupPlans[i]).Error
				assert.NoError(t, err, "插入设置计划失败")
			}

			plans, err := repo.ListBasicPlans()

			if tt.expectedError != nil {
				assert.Error(t, err)
				assert.True(t, errors.Is(err, tt.expectedError))
			} else {
				assert.NoError(t, err)
				assert.Len(t, plans, tt.expectedCount)
				if tt.expectedCount > 0 {
					// 验证返回的计划是否包含预期的ID
					var actualIDs []uint
					for _, p := range plans {
						actualIDs = append(actualIDs, p.ID)
						assert.Empty(t, p.SubPlans, "ListBasicPlans 不应加载子计划")
						assert.Empty(t, p.Tasks, "ListBasicPlans 不应加载任务")
					}
					for _, setupPlan := range tt.setupPlans {
						assert.Contains(t, actualIDs, setupPlan.ID, "返回的计划应包含设置计划的ID")
					}
				}
			}
		})
	}
}

// TestGetBasicPlanByID 测试 GetBasicPlanByID 方法，确保它能根据ID正确返回计划的基本信息。
func TestGetBasicPlanByID(t *testing.T) {
	tests := []struct {
		name          string
		setupPlan     models.Plan
		idToFetch     uint
		expectFound   bool
		expectedError error
	}{
		{
			name:        "通过ID找到计划",
			setupPlan:   createTestPlan("计划 C", "描述 C", models.PlanExecutionTypeAutomatic, models.PlanContentTypeTasks),
			idToFetch:   0, // 创建后设置
			expectFound: true,
		},
		{
			name:          "通过ID未找到计划",
			setupPlan:     models.Plan{}, // 此情况下无需设置计划
			idToFetch:     999,
			expectFound:   false,
			expectedError: gorm.ErrRecordNotFound,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			db := setupTestDB(t)
			repo := repository.NewGormPlanRepository(db)

			if tt.setupPlan.Name != "" { // 仅在有效设置时创建计划
				err := db.Create(&tt.setupPlan).Error
				assert.NoError(t, err, "插入设置计划失败")
				tt.idToFetch = tt.setupPlan.ID // 使用数据库生成的ID
			}

			fetchedPlan, err := repo.GetBasicPlanByID(tt.idToFetch)

			if tt.expectedError != nil {
				assert.Error(t, err)
				assert.True(t, errors.Is(err, tt.expectedError), "预期错误类型不匹配")
				assert.Nil(t, fetchedPlan)
			} else {
				assert.NoError(t, err)
				assert.NotNil(t, fetchedPlan)
				assert.Equal(t, tt.setupPlan.Name, fetchedPlan.Name)
				assert.Equal(t, tt.setupPlan.Description, fetchedPlan.Description)
				assert.Equal(t, tt.setupPlan.ExecutionType, fetchedPlan.ExecutionType)
				assert.Equal(t, tt.setupPlan.ContentType, fetchedPlan.ContentType)
				assert.Empty(t, fetchedPlan.SubPlans, "GetBasicPlanByID 不应加载子计划")
				assert.Empty(t, fetchedPlan.Tasks, "GetBasicPlanByID 不应加载任务")
			}
		})
	}
}

// TestGetPlanByID 测试 GetPlanByID 方法，确保它能根据ID正确返回计划的完整信息，包括关联数据。
func TestGetPlanByID(t *testing.T) {
	type testCase struct {
		name          string
		setupData     func(db *gorm.DB) // 用于在测试前插入数据
		planID        uint
		expectedPlan  *models.Plan
		expectedError string
	}

	testCases := []testCase{
		{
			name: "PlanNotFound",
			setupData: func(db *gorm.DB) {
				// 不插入任何数据
			},
			planID:        999,
			expectedPlan:  nil,
			expectedError: "record not found",
		},
		{
			name: "PlanWithTasks",
			setupData: func(db *gorm.DB) {
				// 使用硬编码的ID创建计划，使测试可预测
				plan := models.Plan{
					Model:       gorm.Model{ID: 1},
					Name:        "Plan A",
					ContentType: models.PlanContentTypeTasks,
				}
				db.Create(&plan)
				// 创建任务，它们的ID将由数据库自动生成
				db.Create(&models.Task{PlanID: 1, Name: "Task 2", ExecutionOrder: 1})
				db.Create(&models.Task{PlanID: 1, Name: "Task 1", ExecutionOrder: 2})
			},
			planID: 1,
			expectedPlan: &models.Plan{
				Model:       gorm.Model{ID: 1},
				Name:        "Plan A",
				ContentType: models.PlanContentTypeTasks,
				Tasks: []models.Task{
					// 期望按 "order" 字段升序排序
					{PlanID: 1, Name: "Task 2", ExecutionOrder: 1},
					{PlanID: 1, Name: "Task 1", ExecutionOrder: 2},
				},
			},
			expectedError: "",
		},
		{
			name: "PlanWithMultiLevelSubPlans",
			setupData: func(db *gorm.DB) {
				// 创建一个三层结构的计划
				db.Create(&models.Plan{Model: gorm.Model{ID: 20}, Name: "Grandparent Plan", ContentType: models.PlanContentTypeSubPlans})
				db.Create(&models.Plan{Model: gorm.Model{ID: 21}, Name: "Parent Plan", ContentType: models.PlanContentTypeSubPlans})
				db.Create(&models.Plan{Model: gorm.Model{ID: 22}, Name: "Child Plan With Tasks", ContentType: models.PlanContentTypeTasks})
				db.Create(&models.Task{PlanID: 22, Name: "Grandchild's Task", ExecutionOrder: 1})

				// 创建关联关系
				db.Create(&models.SubPlan{ParentPlanID: 20, ChildPlanID: 21, ExecutionOrder: 1})
				db.Create(&models.SubPlan{ParentPlanID: 21, ChildPlanID: 22, ExecutionOrder: 1})
			},
			planID: 20,
			expectedPlan: &models.Plan{
				Model:       gorm.Model{ID: 20},
				Name:        "Grandparent Plan",
				ContentType: models.PlanContentTypeSubPlans,
				SubPlans: []models.SubPlan{
					{
						ParentPlanID:   20,
						ChildPlanID:    21,
						ExecutionOrder: 1,
						ChildPlan: &models.Plan{
							Model:       gorm.Model{ID: 21},
							Name:        "Parent Plan",
							ContentType: models.PlanContentTypeSubPlans,
							SubPlans: []models.SubPlan{
								{
									ParentPlanID:   21,
									ChildPlanID:    22,
									ExecutionOrder: 1,
									ChildPlan: &models.Plan{
										Model:       gorm.Model{ID: 22},
										Name:        "Child Plan With Tasks",
										ContentType: models.PlanContentTypeTasks,
										Tasks: []models.Task{
											{PlanID: 22, Name: "Grandchild's Task", ExecutionOrder: 1},
										},
									},
								},
							},
						},
					},
				},
			},
			expectedError: "",
		},
		{
			name: "UnknownContentType",
			setupData: func(db *gorm.DB) {
				db.Create(&models.Plan{
					Model:       gorm.Model{ID: 30},
					Name:        "Unknown Type Plan",
					ContentType: "INVALID_TYPE",
				})
			},
			planID:        30,
			expectedPlan:  nil,
			expectedError: fmt.Sprintf("未知的计划内容类型: INVALID_TYPE; 计划ID: 30"),
		},
		// 新增场景：测试空的关联数据
		{
			name: "PlanWithTasksType_ButNoTasks",
			setupData: func(db *gorm.DB) {
				db.Create(&models.Plan{
					Model:       gorm.Model{ID: 50},
					Name:        "Plan with empty tasks",
					ContentType: models.PlanContentTypeTasks,
				})
			},
			planID: 50,
			expectedPlan: &models.Plan{
				Model:       gorm.Model{ID: 50},
				Name:        "Plan with empty tasks",
				ContentType: models.PlanContentTypeTasks,
				Tasks:       []models.Task{}, // 期望一个空的切片
			},
			expectedError: "",
		},
		// 新增场景：测试复杂的同级排序
		{
			name: "PlanWithSubPlans_ComplexSorting",
			setupData: func(db *gorm.DB) {
				db.Create(&models.Plan{Model: gorm.Model{ID: 60}, Name: "Main Plan For Sorting", ContentType: models.PlanContentTypeSubPlans})
				db.Create(&models.Plan{Model: gorm.Model{ID: 61}, Name: "SubPlan C", ContentType: models.PlanContentTypeTasks})
				db.Create(&models.Plan{Model: gorm.Model{ID: 62}, Name: "SubPlan A", ContentType: models.PlanContentTypeTasks})
				db.Create(&models.Plan{Model: gorm.Model{ID: 63}, Name: "SubPlan B", ContentType: models.PlanContentTypeTasks})
				// 故意打乱顺序插入
				db.Create(&models.SubPlan{ParentPlanID: 60, ChildPlanID: 61, ExecutionOrder: 3})
				db.Create(&models.SubPlan{ParentPlanID: 60, ChildPlanID: 62, ExecutionOrder: 1})
				db.Create(&models.SubPlan{ParentPlanID: 60, ChildPlanID: 63, ExecutionOrder: 2})
			},
			planID: 60,
			expectedPlan: &models.Plan{
				Model:       gorm.Model{ID: 60},
				Name:        "Main Plan For Sorting",
				ContentType: models.PlanContentTypeSubPlans,
				SubPlans: []models.SubPlan{
					{ParentPlanID: 60, ChildPlanID: 62, ExecutionOrder: 1, ChildPlan: &models.Plan{Model: gorm.Model{ID: 62}, Name: "SubPlan A", ContentType: models.PlanContentTypeTasks, Tasks: []models.Task{}}},
					{ParentPlanID: 60, ChildPlanID: 63, ExecutionOrder: 2, ChildPlan: &models.Plan{Model: gorm.Model{ID: 63}, Name: "SubPlan B", ContentType: models.PlanContentTypeTasks, Tasks: []models.Task{}}},
					{ParentPlanID: 60, ChildPlanID: 61, ExecutionOrder: 3, ChildPlan: &models.Plan{Model: gorm.Model{ID: 61}, Name: "SubPlan C", ContentType: models.PlanContentTypeTasks, Tasks: []models.Task{}}},
				},
			},
			expectedError: "",
		},
		// 新增场景：测试混合内容的子计划树
		{
			name: "PlanWithSubPlans_MixedContentTypes",
			setupData: func(db *gorm.DB) {
				db.Create(&models.Plan{Model: gorm.Model{ID: 70}, Name: "Mixed Main Plan", ContentType: models.PlanContentTypeSubPlans})
				db.Create(&models.Plan{Model: gorm.Model{ID: 71}, Name: "Child with SubPlans", ContentType: models.PlanContentTypeSubPlans})
				db.Create(&models.Plan{Model: gorm.Model{ID: 72}, Name: "Grandchild with Tasks", ContentType: models.PlanContentTypeTasks})
				db.Create(&models.Task{PlanID: 72, Name: "Grandchild's Task", ExecutionOrder: 1})
				db.Create(&models.Plan{Model: gorm.Model{ID: 73}, Name: "Child with Tasks", ContentType: models.PlanContentTypeTasks})
				db.Create(&models.Task{PlanID: 73, Name: "Child's Task", ExecutionOrder: 1})

				// 创建关联
				db.Create(&models.SubPlan{ParentPlanID: 70, ChildPlanID: 71, ExecutionOrder: 1}) // Main -> Child with SubPlans
				db.Create(&models.SubPlan{ParentPlanID: 70, ChildPlanID: 73, ExecutionOrder: 2}) // Main -> Child with Tasks
				db.Create(&models.SubPlan{ParentPlanID: 71, ChildPlanID: 72, ExecutionOrder: 1}) // Child with SubPlans -> Grandchild
			},
			planID: 70,
			expectedPlan: &models.Plan{
				Model:       gorm.Model{ID: 70},
				Name:        "Mixed Main Plan",
				ContentType: models.PlanContentTypeSubPlans,
				SubPlans: []models.SubPlan{
					{
						ParentPlanID: 70, ChildPlanID: 71, ExecutionOrder: 1,
						ChildPlan: &models.Plan{
							Model: gorm.Model{ID: 71}, Name: "Child with SubPlans", ContentType: models.PlanContentTypeSubPlans,
							SubPlans: []models.SubPlan{
								{ParentPlanID: 71, ChildPlanID: 72, ExecutionOrder: 1, ChildPlan: &models.Plan{
									Model: gorm.Model{ID: 72}, Name: "Grandchild with Tasks", ContentType: models.PlanContentTypeTasks,
									Tasks: []models.Task{{PlanID: 72, Name: "Grandchild's Task", ExecutionOrder: 1}},
								}},
							},
						},
					},
					{
						ParentPlanID: 70, ChildPlanID: 73, ExecutionOrder: 2,
						ChildPlan: &models.Plan{
							Model: gorm.Model{ID: 73}, Name: "Child with Tasks", ContentType: models.PlanContentTypeTasks,
							Tasks: []models.Task{{PlanID: 73, Name: "Child's Task", ExecutionOrder: 1}},
						},
					},
				},
			},
			expectedError: "",
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			db := setupTestDB(t)
			// 使用 defer 确保数据库连接在测试结束后关闭
			sqlDB, _ := db.DB()
			defer sqlDB.Close()

			tc.setupData(db)

			repo := repository.NewGormPlanRepository(db)
			plan, err := repo.GetPlanByID(tc.planID)

			if tc.expectedError != "" {
				assert.Error(t, err)
				assert.Contains(t, err.Error(), tc.expectedError)
				assert.Nil(t, plan)
			} else {
				assert.NoError(t, err)
				assert.NotNil(t, plan)

				// 在比较之前，清理实际结果和期望结果中所有不确定的、由数据库自动生成的字段
				cleanPlanForComparison(plan)
				cleanPlanForComparison(tc.expectedPlan)

				assert.Equal(t, tc.expectedPlan, plan)
			}
		})
	}
}

// cleanPlanForComparison 递归地重置 Plan 对象及其关联对象中由数据库自动生成的字段（如ID和时间戳），
// 以便在测试中断言它们与期望值相等。
func cleanPlanForComparison(p *models.Plan) {
	if p == nil {
		return
	}

	// 重置 Plan 自身的时间戳
	p.CreatedAt = time.Time{}
	p.UpdatedAt = time.Time{}
	p.DeletedAt = gorm.DeletedAt{}

	// 重置所有 Task 的自动生成字段
	for i := range p.Tasks {
		p.Tasks[i].ID = 0 // ID是自动生成的，必须重置为0才能与期望值匹配
		p.Tasks[i].CreatedAt = time.Time{}
		p.Tasks[i].UpdatedAt = time.Time{}
		p.Tasks[i].DeletedAt = gorm.DeletedAt{}
	}

	// 重置所有 SubPlan 的自动生成字段，并递归清理子计划
	for i := range p.SubPlans {
		p.SubPlans[i].ID = 0 // SubPlan 连接记录的ID也是自动生成的
		p.SubPlans[i].CreatedAt = time.Time{}
		p.SubPlans[i].UpdatedAt = time.Time{}
		p.SubPlans[i].DeletedAt = gorm.DeletedAt{}

		// 递归调用以清理嵌套的子计划
		cleanPlanForComparison(p.SubPlans[i].ChildPlan)
	}
}