package repository

import (
	"errors"
	"time"

	"git.huangwc.com/pig/pig-farm-controller/internal/infra/models"
	"gorm.io/gorm"
)

// PlanExecutionLogListOptions 定义了查询计划执行日志时的可选参数
type PlanExecutionLogListOptions struct {
	PlanID    *uint
	Status    *models.ExecutionStatus
	StartTime *time.Time // 基于 created_at 字段
	EndTime   *time.Time // 基于 created_at 字段
	OrderBy   string     // 例如 "created_at asc"
}

// TaskExecutionLogListOptions 定义了查询任务执行日志时的可选参数
type TaskExecutionLogListOptions struct {
	PlanExecutionLogID *uint
	TaskID             *int
	Status             *models.ExecutionStatus
	StartTime          *time.Time // 基于 created_at 字段
	EndTime            *time.Time // 基于 created_at 字段
	OrderBy            string     // 例如 "created_at asc"
}

// ExecutionLogRepository 定义了与执行日志交互的接口。
type ExecutionLogRepository interface {
	// --- Existing methods ---
	UpdateTaskExecutionLogStatusByIDs(logIDs []uint, status models.ExecutionStatus) error
	UpdateTaskExecutionLogStatus(logID uint, status models.ExecutionStatus) error
	CreateTaskExecutionLog(log *models.TaskExecutionLog) error
	CreatePlanExecutionLog(log *models.PlanExecutionLog) error
	UpdatePlanExecutionLog(log *models.PlanExecutionLog) error
	CreateTaskExecutionLogsInBatch(logs []*models.TaskExecutionLog) error
	UpdateTaskExecutionLog(log *models.TaskExecutionLog) error
	FindTaskExecutionLogByID(id uint) (*models.TaskExecutionLog, error)
	// UpdatePlanExecutionLogStatus 更新计划执行日志的状态
	UpdatePlanExecutionLogStatus(logID uint, status models.ExecutionStatus) error

	// UpdatePlanExecutionLogsStatusByIDs 批量更新计划执行日志的状态
	UpdatePlanExecutionLogsStatusByIDs(logIDs []uint, status models.ExecutionStatus) error

	// FindIncompletePlanExecutionLogs 查找所有未完成的计划执行日志
	FindIncompletePlanExecutionLogs() ([]models.PlanExecutionLog, error)
	// FindInProgressPlanExecutionLogByPlanID 根据 PlanID 查找正在进行的计划执行日志
	FindInProgressPlanExecutionLogByPlanID(planID uint) (*models.PlanExecutionLog, error)
	// FindIncompleteTaskExecutionLogsByPlanLogID 根据计划日志ID查找所有未完成的任务日志
	FindIncompleteTaskExecutionLogsByPlanLogID(planLogID uint) ([]models.TaskExecutionLog, error)

	// FailAllIncompletePlanExecutionLogs 将所有状态为 ExecutionStatusStarted 和 ExecutionStatusWaiting 的计划状态都修改为 ExecutionStatusFailed
	FailAllIncompletePlanExecutionLogs() error
	// CancelAllIncompleteTaskExecutionLogs 将所有状态为 ExecutionStatusStarted 和 ExecutionStatusWaiting 的任务状态修改为 ExecutionStatusCancelled
	CancelAllIncompleteTaskExecutionLogs() error

	// FindPlanExecutionLogByID 根据ID查找计划执行日志
	FindPlanExecutionLogByID(id uint) (*models.PlanExecutionLog, error)

	// CountIncompleteTasksByPlanLogID 计算一个计划执行中未完成的任务数量
	CountIncompleteTasksByPlanLogID(planLogID uint) (int64, error)

	// FailPlanExecution 将指定的计划执行标记为失败
	FailPlanExecution(planLogID uint, errorMessage string) error

	// CancelIncompleteTasksByPlanLogID 取消一个计划执行中的所有未完成任务
	CancelIncompleteTasksByPlanLogID(planLogID uint, reason string) error

	// --- New methods ---
	ListPlanExecutionLogs(opts PlanExecutionLogListOptions, page, pageSize int) ([]models.PlanExecutionLog, int64, error)
	ListTaskExecutionLogs(opts TaskExecutionLogListOptions, page, pageSize int) ([]models.TaskExecutionLog, int64, error)
}

// gormExecutionLogRepository 是使用 GORM 的具体实现。
type gormExecutionLogRepository struct {
	db *gorm.DB
}

// NewGormExecutionLogRepository 创建一个新的执行日志仓库。
func NewGormExecutionLogRepository(db *gorm.DB) ExecutionLogRepository {
	return &gormExecutionLogRepository{db: db}
}

// ListPlanExecutionLogs 实现了分页和过滤查询计划执行日志的功能
func (r *gormExecutionLogRepository) ListPlanExecutionLogs(opts PlanExecutionLogListOptions, page, pageSize int) ([]models.PlanExecutionLog, int64, error) {
	if page <= 0 || pageSize <= 0 {
		return nil, 0, ErrInvalidPagination
	}

	var results []models.PlanExecutionLog
	var total int64

	query := r.db.Model(&models.PlanExecutionLog{})

	if opts.PlanID != nil {
		query = query.Where("plan_id = ?", *opts.PlanID)
	}
	if opts.Status != nil {
		query = query.Where("status = ?", *opts.Status)
	}
	if opts.StartTime != nil {
		query = query.Where("created_at >= ?", *opts.StartTime)
	}
	if opts.EndTime != nil {
		query = query.Where("created_at <= ?", *opts.EndTime)
	}

	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	orderBy := "created_at DESC"
	if opts.OrderBy != "" {
		orderBy = opts.OrderBy
	}
	query = query.Order(orderBy)

	offset := (page - 1) * pageSize
	err := query.Limit(pageSize).Offset(offset).Find(&results).Error

	return results, total, err
}

// ListTaskExecutionLogs 实现了分页和过滤查询任务执行日志的功能
func (r *gormExecutionLogRepository) ListTaskExecutionLogs(opts TaskExecutionLogListOptions, page, pageSize int) ([]models.TaskExecutionLog, int64, error) {
	if page <= 0 || pageSize <= 0 {
		return nil, 0, ErrInvalidPagination
	}

	var results []models.TaskExecutionLog
	var total int64

	query := r.db.Model(&models.TaskExecutionLog{})

	if opts.PlanExecutionLogID != nil {
		query = query.Where("plan_execution_log_id = ?", *opts.PlanExecutionLogID)
	}
	if opts.TaskID != nil {
		query = query.Where("task_id = ?", *opts.TaskID)
	}
	if opts.Status != nil {
		query = query.Where("status = ?", *opts.Status)
	}
	if opts.StartTime != nil {
		query = query.Where("created_at >= ?", *opts.StartTime)
	}
	if opts.EndTime != nil {
		query = query.Where("created_at <= ?", *opts.EndTime)
	}

	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	orderBy := "created_at DESC"
	if opts.OrderBy != "" {
		orderBy = opts.OrderBy
	}
	// 预加载关联的Task信息
	query = query.Order(orderBy).Preload("Task")

	offset := (page - 1) * pageSize
	err := query.Limit(pageSize).Offset(offset).Find(&results).Error

	return results, total, err
}

// --- Existing method implementations ---

func (r *gormExecutionLogRepository) UpdateTaskExecutionLogStatusByIDs(logIDs []uint, status models.ExecutionStatus) error {
	if len(logIDs) == 0 {
		return nil
	}
	return r.db.Model(&models.TaskExecutionLog{}).Where("id IN ?", logIDs).Update("status", status).Error
}

func (r *gormExecutionLogRepository) UpdateTaskExecutionLogStatus(logID uint, status models.ExecutionStatus) error {
	return r.db.Model(&models.TaskExecutionLog{}).Where("id = ?", logID).Update("status", status).Error
}

func (r *gormExecutionLogRepository) CreateTaskExecutionLog(log *models.TaskExecutionLog) error {
	return r.db.Create(log).Error
}

// CreatePlanExecutionLog 为一次计划执行创建一条新的日志条目。
func (r *gormExecutionLogRepository) CreatePlanExecutionLog(log *models.PlanExecutionLog) error {
	return r.db.Create(log).Error
}

// UpdatePlanExecutionLog 使用 Updates 方法更新一个计划执行日志。
// GORM 的 Updates 传入 struct 时，只会更新非零值字段。
// 在这里，我们期望传入的对象一定包含一个有效的 ID。
func (r *gormExecutionLogRepository) UpdatePlanExecutionLog(log *models.PlanExecutionLog) error {
	return r.db.Updates(log).Error
}

// CreateTaskExecutionLogsInBatch 在一次数据库调用中创建多个任务执行日志条目。
// 这是“预写日志”步骤的关键。
func (r *gormExecutionLogRepository) CreateTaskExecutionLogsInBatch(logs []*models.TaskExecutionLog) error {
	if len(logs) == 0 {
		return nil
	}
	// GORM 的 CreateTx 传入一个切片指针会执行批量插入。
	return r.db.Create(&logs).Error
}

// UpdateTaskExecutionLog 使用 Updates 方法更新一个任务执行日志。
// GORM 的 Updates 传入 struct 时，只会更新非零值字段。
// 这种方式代码更直观，上层服务可以直接修改模型对象后进行保存。
func (r *gormExecutionLogRepository) UpdateTaskExecutionLog(log *models.TaskExecutionLog) error {
	return r.db.Updates(log).Error
}

// FindTaskExecutionLogByID 根据 ID 查找单个任务执行日志。
// 它会预加载关联的 Task 信息。
func (r *gormExecutionLogRepository) FindTaskExecutionLogByID(id uint) (*models.TaskExecutionLog, error) {
	var log models.TaskExecutionLog
	// 使用 Preload("Task") 来确保关联的任务信息被一并加载
	err := r.db.Preload("Task").First(&log, id).Error
	if err != nil {
		return nil, err
	}
	return &log, nil
}

// UpdatePlanExecutionLogStatus 更新计划执行日志的状态
func (r *gormExecutionLogRepository) UpdatePlanExecutionLogStatus(logID uint, status models.ExecutionStatus) error {
	return r.db.Model(&models.PlanExecutionLog{}).Where("id = ?", logID).Update("status", status).Error
}

// UpdatePlanExecutionLogsStatusByIDs 批量更新计划执行日志的状态
func (r *gormExecutionLogRepository) UpdatePlanExecutionLogsStatusByIDs(logIDs []uint, status models.ExecutionStatus) error {
	if len(logIDs) == 0 {
		return nil
	}
	return r.db.Model(&models.PlanExecutionLog{}).Where("id IN ?", logIDs).Update("status", status).Error
}

// FindIncompletePlanExecutionLogs 查找所有未完成的计划执行日志
func (r *gormExecutionLogRepository) FindIncompletePlanExecutionLogs() ([]models.PlanExecutionLog, error) {
	var logs []models.PlanExecutionLog
	err := r.db.Where("status = ? OR status = ?", models.ExecutionStatusStarted, models.ExecutionStatusWaiting).Find(&logs).Error
	return logs, err
}

// FindInProgressPlanExecutionLogByPlanID 根据 PlanID 查找正在进行的计划执行日志
func (r *gormExecutionLogRepository) FindInProgressPlanExecutionLogByPlanID(planID uint) (*models.PlanExecutionLog, error) {
	var log models.PlanExecutionLog
	err := r.db.Where("plan_id = ? AND status = ?", planID, models.ExecutionStatusStarted).First(&log).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			// 未找到不是一个需要上报的错误，代表计划当前没有在运行
			return nil, nil
		}
		// 其他数据库错误
		return nil, err
	}
	return &log, nil
}

// FindIncompleteTaskExecutionLogsByPlanLogID 根据计划日志ID查找所有未完成的任务日志
func (r *gormExecutionLogRepository) FindIncompleteTaskExecutionLogsByPlanLogID(planLogID uint) ([]models.TaskExecutionLog, error) {
	var logs []models.TaskExecutionLog
	err := r.db.Where("plan_execution_log_id = ? AND (status = ? OR status = ?)",
		planLogID, models.ExecutionStatusWaiting, models.ExecutionStatusStarted).Find(&logs).Error
	return logs, err
}

// FailAllIncompletePlanExecutionLogs 将所有状态为 ExecutionStatusStarted 和 ExecutionStatusWaiting 的计划状态都修改为 ExecutionStatusFailed
func (r *gormExecutionLogRepository) FailAllIncompletePlanExecutionLogs() error {
	return r.db.Model(&models.PlanExecutionLog{}).
		Where("status IN (?, ?)", models.ExecutionStatusStarted, models.ExecutionStatusWaiting).
		Updates(map[string]interface{}{"status": models.ExecutionStatusFailed, "ended_at": time.Now(), "error": "系统中断"}).Error
}

// CancelAllIncompleteTaskExecutionLogs 将所有状态为 ExecutionStatusStarted 和 ExecutionStatusWaiting 的任务状态修改为 ExecutionStatusCancelled
func (r *gormExecutionLogRepository) CancelAllIncompleteTaskExecutionLogs() error {
	return r.db.Model(&models.TaskExecutionLog{}).
		Where("status IN (?, ?)", models.ExecutionStatusStarted, models.ExecutionStatusWaiting).
		Updates(map[string]interface{}{"status": models.ExecutionStatusCancelled, "ended_at": time.Now(), "output": "系统中断"}).Error
}

// FindPlanExecutionLogByID 根据ID查找计划执行日志
func (r *gormExecutionLogRepository) FindPlanExecutionLogByID(id uint) (*models.PlanExecutionLog, error) {
	var log models.PlanExecutionLog
	err := r.db.First(&log, id).Error
	if err != nil {
		return nil, err
	}
	return &log, nil
}

// CountIncompleteTasksByPlanLogID 计算一个计划执行中未完成的任务数量
func (r *gormExecutionLogRepository) CountIncompleteTasksByPlanLogID(planLogID uint) (int64, error) {
	var count int64
	err := r.db.Model(&models.TaskExecutionLog{}).
		Where("plan_execution_log_id = ? AND status IN (?, ?)",
			planLogID, models.ExecutionStatusWaiting, models.ExecutionStatusStarted).
		Count(&count).Error
	return count, err
}

// FailPlanExecution 将指定的计划执行标记为失败
func (r *gormExecutionLogRepository) FailPlanExecution(planLogID uint, errorMessage string) error {
	return r.db.Model(&models.PlanExecutionLog{}).
		Where("id = ?", planLogID).
		Updates(map[string]interface{}{
			"status":   models.ExecutionStatusFailed,
			"error":    errorMessage,
			"ended_at": time.Now(),
		}).Error
}

// CancelIncompleteTasksByPlanLogID 取消一个计划执行中的所有未完成任务
func (r *gormExecutionLogRepository) CancelIncompleteTasksByPlanLogID(planLogID uint, reason string) error {
	return r.db.Model(&models.TaskExecutionLog{}).
		Where("plan_execution_log_id = ? AND status IN (?, ?)",
			planLogID, models.ExecutionStatusWaiting, models.ExecutionStatusStarted).
		Updates(map[string]interface{}{
			"status":   models.ExecutionStatusCancelled,
			"output":   reason,
			"ended_at": time.Now(),
		}).Error
}