package repository

import (
	"context"

	"with_you/internal/model"

	"gorm.io/gorm"
)

// CallRepository 通话仓库接口
type CallRepository interface {
	// 通话会话操作
	CreateCall(call *model.CallSession) error
	GetCallByID(id string) (*model.CallSession, error)
	GetCallByIDWithParticipants(id string) (*model.CallSession, error)
	UpdateCall(call *model.CallSession) error
	GetActiveCallByConversationID(conversationID string) (*model.CallSession, error)
	GetActiveCallsByUserID(userID string) ([]model.CallSession, error) // 获取用户参与的活跃通话

	// 通话参与者操作
	CreateCallParticipant(participant *model.CallParticipant) error
	GetCallParticipant(callID, userID string) (*model.CallParticipant, error)
	GetCallParticipants(callID string) ([]model.CallParticipant, error)
	UpdateCallParticipant(participant *model.CallParticipant) error

	// 通话历史
	GetCallHistory(userID string, page, pageSize int) ([]model.CallSession, int64, error)

	// 事务操作
	CreateCallWithParticipants(ctx context.Context, call *model.CallSession, participants []*model.CallParticipant) error
}

// callRepository 通话仓库实现
type callRepository struct {
	db *gorm.DB
}

// NewCallRepository 创建通话仓库
func NewCallRepository(db *gorm.DB) CallRepository {
	return &callRepository{db: db}
}

// CreateCall 创建通话会话
func (r *callRepository) CreateCall(call *model.CallSession) error {
	return r.db.Create(call).Error
}

// GetCallByID 根据ID获取通话会话
func (r *callRepository) GetCallByID(id string) (*model.CallSession, error) {
	var call model.CallSession
	err := r.db.First(&call, "id = ?", id).Error
	if err != nil {
		return nil, err
	}
	return &call, nil
}

// GetCallByIDWithParticipants 根据ID获取通话会话（包含参与者）
func (r *callRepository) GetCallByIDWithParticipants(id string) (*model.CallSession, error) {
	var call model.CallSession
	err := r.db.Preload("Participants").First(&call, "id = ?", id).Error
	if err != nil {
		return nil, err
	}
	return &call, nil
}

// UpdateCall 更新通话会话
func (r *callRepository) UpdateCall(call *model.CallSession) error {
	return r.db.Save(call).Error
}

// GetActiveCallByConversationID 获取会话中的活跃通话
func (r *callRepository) GetActiveCallByConversationID(conversationID string) (*model.CallSession, error) {
	var call model.CallSession
	err := r.db.Where("conversation_id = ? AND status IN ?", conversationID, []model.CallStatus{
		model.CallStatusCalling,
		model.CallStatusConnected,
	}).First(&call).Error
	if err != nil {
		return nil, err
	}
	return &call, nil
}

// GetActiveCallsByUserID 获取用户参与的所有活跃通话
func (r *callRepository) GetActiveCallsByUserID(userID string) ([]model.CallSession, error) {
	var calls []model.CallSession

	// 子查询获取用户参与的通话ID
	subQuery := r.db.Model(&model.CallParticipant{}).
		Select("DISTINCT call_id").
		Where("user_id = ?", userID)

	err := r.db.Where("id IN (?) AND status IN ?", subQuery, []model.CallStatus{
		model.CallStatusCalling,
		model.CallStatusConnected,
	}).Preload("Participants").Find(&calls).Error
	if err != nil {
		return nil, err
	}
	return calls, nil
}

// CreateCallParticipant 创建通话参与者
func (r *callRepository) CreateCallParticipant(participant *model.CallParticipant) error {
	return r.db.Create(participant).Error
}

// GetCallParticipant 获取通话参与者
func (r *callRepository) GetCallParticipant(callID, userID string) (*model.CallParticipant, error) {
	var participant model.CallParticipant
	err := r.db.Where("call_id = ? AND user_id = ?", callID, userID).First(&participant).Error
	if err != nil {
		return nil, err
	}
	return &participant, nil
}

// GetCallParticipants 获取通话参与者列表
func (r *callRepository) GetCallParticipants(callID string) ([]model.CallParticipant, error) {
	var participants []model.CallParticipant
	err := r.db.Where("call_id = ?", callID).Find(&participants).Error
	if err != nil {
		return nil, err
	}
	return participants, nil
}

// UpdateCallParticipant 更新通话参与者
func (r *callRepository) UpdateCallParticipant(participant *model.CallParticipant) error {
	return r.db.Save(participant).Error
}

// GetCallHistory 获取用户通话历史
func (r *callRepository) GetCallHistory(userID string, page, pageSize int) ([]model.CallSession, int64, error) {
	var calls []model.CallSession
	var total int64

	// 子查询获取用户参与的通话ID
	subQuery := r.db.Model(&model.CallParticipant{}).
		Select("DISTINCT call_id").
		Where("user_id = ?", userID)

	query := r.db.Model(&model.CallSession{}).
		Where("id IN (?)", subQuery).
		Order("created_at DESC")

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

	offset := (page - 1) * pageSize
	if err := query.Preload("Participants").Offset(offset).Limit(pageSize).Find(&calls).Error; err != nil {
		return nil, 0, err
	}

	return calls, total, nil
}

// CreateCallWithParticipants 创建通话会话和参与者（事务）
func (r *callRepository) CreateCallWithParticipants(ctx context.Context, call *model.CallSession, participants []*model.CallParticipant) error {
	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := tx.Create(call).Error; err != nil {
			return err
		}
		for _, p := range participants {
			p.CallID = call.ID
			if err := tx.Create(p).Error; err != nil {
				return err
			}
		}
		return nil
	})
}