package repository

import (
	"context"

	"gorm.io/gorm"

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

// AssignmentPolicyRepo implements GORM repository for AssignmentPolicy.
// Reference: Chatwoot app/models/assignment_policy.rb
type AssignmentPolicyRepo struct {
	db *gorm.DB
}

// NewAssignmentPolicyRepo creates a new AssignmentPolicy repository.
func NewAssignmentPolicyRepo(db *gorm.DB) *AssignmentPolicyRepo {
	return &AssignmentPolicyRepo{db: db}
}

// Create creates a new assignment policy.
func (r *AssignmentPolicyRepo) Create(ctx context.Context, policy *model.AssignmentPolicy) error {
	return r.db.WithContext(ctx).Create(policy).Error
}

// FindByID retrieves an assignment policy by primary key.
func (r *AssignmentPolicyRepo) FindByID(ctx context.Context, id uint) (*model.AssignmentPolicy, error) {
	var policy model.AssignmentPolicy
	if err := r.db.WithContext(ctx).First(&policy, id).Error; err != nil {
		return nil, err
	}
	return &policy, nil
}

// GetByID retrieves an assignment policy by primary key (alias for FindByID matching service expectations).
func (r *AssignmentPolicyRepo) GetByID(ctx context.Context, id uint) (*model.AssignmentPolicy, error) {
	return r.FindByID(ctx, id)
}

// FindByAccount retrieves all assignment policies for an account.
func (r *AssignmentPolicyRepo) FindByAccount(ctx context.Context, accountID uint) ([]model.AssignmentPolicy, error) {
	var policies []model.AssignmentPolicy
	if err := r.db.WithContext(ctx).
		Where("account_id = ?", accountID).
		Order("id ASC").
		Find(&policies).Error; err != nil {
		return nil, err
	}
	return policies, nil

}

// FindByAccountAndID retrieves an account-scoped assignment policy.
func (r *AssignmentPolicyRepo) FindByAccountAndID(ctx context.Context, accountID, id uint) (*model.AssignmentPolicy, error) {
	var policy model.AssignmentPolicy
	if err := r.db.WithContext(ctx).
		Where("account_id = ? AND id = ?", accountID, id).
		First(&policy).Error; err != nil {
		return nil, err
	}
	return &policy, nil
}

// Update updates an assignment policy.
func (r *AssignmentPolicyRepo) Update(ctx context.Context, policy *model.AssignmentPolicy) error {
	return r.db.WithContext(ctx).Save(policy).Error
}

// Delete soft-deletes an assignment policy.
func (r *AssignmentPolicyRepo) Delete(ctx context.Context, id uint) error {
	return r.db.WithContext(ctx).Delete(&model.AssignmentPolicy{}, id).Error

}

// CountAssignedInboxes returns how many inboxes use an assignment policy.
func (r *AssignmentPolicyRepo) CountAssignedInboxes(ctx context.Context, policyID uint) (int64, error) {
	var count int64
	err := r.db.WithContext(ctx).
		Model(&model.InboxAssignmentPolicy{}).
		Where("assignment_policy_id = ?", policyID).
		Count(&count).Error
	return count, err
}

// InboxAssignmentPolicyRepo implements GORM repository for InboxAssignmentPolicy.
// Reference: Chatwoot app/models/inbox_assignment_policy.rb
type InboxAssignmentPolicyRepo struct {
	db *gorm.DB
}

// NewInboxAssignmentPolicyRepo creates a new InboxAssignmentPolicy repository.
func NewInboxAssignmentPolicyRepo(db *gorm.DB) *InboxAssignmentPolicyRepo {
	return &InboxAssignmentPolicyRepo{db: db}
}

// Create creates a new inbox assignment policy.
func (r *InboxAssignmentPolicyRepo) Create(ctx context.Context, policy *model.InboxAssignmentPolicy) error {
	return r.db.WithContext(ctx).Create(policy).Error
}

// FindByID retrieves an inbox assignment policy by primary key.
func (r *InboxAssignmentPolicyRepo) FindByID(ctx context.Context, id uint) (*model.InboxAssignmentPolicy, error) {
	var policy model.InboxAssignmentPolicy
	if err := r.db.WithContext(ctx).First(&policy, id).Error; err != nil {
		return nil, err
	}
	return &policy, nil
}

// FindByInbox retrieves the active assignment policy override for an inbox.
func (r *InboxAssignmentPolicyRepo) FindByInbox(ctx context.Context, accountID, inboxID uint) (*model.InboxAssignmentPolicy, error) {
	var policy model.InboxAssignmentPolicy
	if err := r.db.WithContext(ctx).
		Joins("JOIN assignment_policies ON assignment_policies.id = inbox_assignment_policies.assignment_policy_id").
		Where("assignment_policies.account_id = ? AND inbox_assignment_policies.inbox_id = ?", accountID, inboxID).
		First(&policy).Error; err != nil {
		return nil, err
	}
	return &policy, nil
}

// FindPolicyByInbox retrieves the assignment policy associated with an inbox.
func (r *InboxAssignmentPolicyRepo) FindPolicyByInbox(ctx context.Context, accountID, inboxID uint) (*model.AssignmentPolicy, error) {
	var policy model.AssignmentPolicy
	if err := r.db.WithContext(ctx).
		Joins("JOIN inbox_assignment_policies ON inbox_assignment_policies.assignment_policy_id = assignment_policies.id").
		Where("assignment_policies.account_id = ? AND inbox_assignment_policies.inbox_id = ?", accountID, inboxID).
		First(&policy).Error; err != nil {
		return nil, err
	}
	return &policy, nil
}

// FindInboxesByPolicy retrieves inboxes linked to an account-scoped policy.
func (r *InboxAssignmentPolicyRepo) FindInboxesByPolicy(ctx context.Context, accountID, policyID uint) ([]model.Inbox, error) {
	var inboxes []model.Inbox
	err := r.db.WithContext(ctx).
		Joins("JOIN inbox_assignment_policies ON inbox_assignment_policies.inbox_id = inboxes.id").
		Joins("JOIN assignment_policies ON assignment_policies.id = inbox_assignment_policies.assignment_policy_id").
		Where("assignment_policies.account_id = ? AND assignment_policies.id = ?", accountID, policyID).
		Order("inboxes.id ASC").
		Find(&inboxes).Error
	return inboxes, err
}

// ReplaceForInbox attaches one policy to an inbox, replacing an old association.
func (r *InboxAssignmentPolicyRepo) ReplaceForInbox(ctx context.Context, inboxID, policyID uint) (*model.InboxAssignmentPolicy, error) {
	var policy model.InboxAssignmentPolicy
	err := r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := tx.Where("inbox_id = ?", inboxID).Delete(&model.InboxAssignmentPolicy{}).Error; err != nil {
			return err
		}
		policy = model.InboxAssignmentPolicy{InboxID: inboxID, AssignmentPolicyID: policyID}
		return tx.Create(&policy).Error
	})
	if err != nil {
		return nil, err
	}
	return &policy, nil
}

// DeleteByInbox removes an inbox assignment policy association.
func (r *InboxAssignmentPolicyRepo) DeleteByInbox(ctx context.Context, inboxID uint) error {
	return r.db.WithContext(ctx).
		Where("inbox_id = ?", inboxID).
		Delete(&model.InboxAssignmentPolicy{}).Error
}

// Update updates an inbox assignment policy.
func (r *InboxAssignmentPolicyRepo) Update(ctx context.Context, policy *model.InboxAssignmentPolicy) error {
	return r.db.WithContext(ctx).Save(policy).Error
}

// Delete soft-deletes an inbox assignment policy.
func (r *InboxAssignmentPolicyRepo) Delete(ctx context.Context, id uint) error {
	return r.db.WithContext(ctx).Delete(&model.InboxAssignmentPolicy{}, id).Error
}