package repository

import (
	"context"

	"gorm.io/gorm"

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

// AgentBotRepo implements GORM repository for AgentBot.
// Reference: Chatwoot app/models/agent_bot.rb
type AgentBotRepo struct {
	db *gorm.DB
}

// NewAgentBotRepo creates a new AgentBot repository.
func NewAgentBotRepo(db *gorm.DB) *AgentBotRepo {
	return &AgentBotRepo{db: db}
}

// GetByID retrieves an agent_bot by primary key (alias for FindByID).
func (r *AgentBotRepo) GetByID(ctx context.Context, id uint) (*model.AgentBot, error) {
	return r.FindByID(ctx, id)
}

// FindByID retrieves an agent_bot by primary key, preloading Inboxes.
func (r *AgentBotRepo) FindByID(ctx context.Context, id uint) (*model.AgentBot, error) {
	var bot model.AgentBot
	err := r.db.WithContext(ctx).Preload("Inboxes").First(&bot, id).Error
	if err != nil {
		return nil, err
	}
	return &bot, nil
}

// FindByAccount retrieves all agent_bots for an account with pagination.
func (r *AgentBotRepo) FindByAccount(ctx context.Context, accountID uint, offset, limit int) ([]model.AgentBot, int64, error) {
	var bots []model.AgentBot
	var total int64

	q := r.db.WithContext(ctx).Where("account_id = ?", accountID)
	if err := q.Model(&model.AgentBot{}).Count(&total).Error; err != nil {
		return nil, 0, err
	}

	err := q.Offset(offset).Limit(limit).
		Order("id ASC").Find(&bots).Error
	return bots, total, err
}

// FindByAccountID retrieves all agent_bots for an account (alias matching service expectations).
func (r *AgentBotRepo) FindByAccountID(ctx context.Context, accountID uint) ([]model.AgentBot, error) {
	bots, _, err := r.FindByAccount(ctx, accountID, 0, 1000)
	return bots, err
}

// Create creates a new agent_bot.
func (r *AgentBotRepo) Create(ctx context.Context, bot *model.AgentBot) error {
	return r.db.WithContext(ctx).Create(bot).Error
}

// CreateWithToken creates a new agent_bot with an access token already set.
// The token is assigned to the bot's AccessToken field before persisting.
func (r *AgentBotRepo) CreateWithToken(ctx context.Context, bot *model.AgentBot, token string) error {
	bot.AccessToken = token
	return r.db.WithContext(ctx).Create(bot).Error
}

// Update updates an existing agent_bot.
func (r *AgentBotRepo) Update(ctx context.Context, bot *model.AgentBot) error {
	return r.db.WithContext(ctx).Save(bot).Error
}

// UpdateAccessToken updates only the access token field for an agent_bot.
func (r *AgentBotRepo) UpdateAccessToken(ctx context.Context, id uint, token string) error {
	return r.db.WithContext(ctx).Model(&model.AgentBot{}).Where("id = ?", id).
		Update("access_token", token).Error
}

// Delete deletes an agent_bot by ID.
func (r *AgentBotRepo) Delete(ctx context.Context, id uint) error {
	return r.db.WithContext(ctx).Delete(&model.AgentBot{}, id).Error
}

// FindAccessible retrieves agent_bots accessible to an account (account_id = nil OR account_id = given).
// Reference: Chatwoot AgentBot.scope :accessible_to(account) — includes global bots + account bots.
func (r *AgentBotRepo) FindAccessible(ctx context.Context, accountID uint) ([]model.AgentBot, error) {
	var bots []model.AgentBot
	err := r.db.WithContext(ctx).
		Where("account_id IS NULL OR account_id = ?", accountID).
		Order("id ASC").
		Find(&bots).Error
	return bots, err
}

// FindAccessiblePaginated retrieves accessible agent_bots with pagination.
func (r *AgentBotRepo) FindAccessiblePaginated(ctx context.Context, accountID uint, offset, limit int) ([]model.AgentBot, int64, error) {
	var bots []model.AgentBot
	var total int64

	q := r.db.WithContext(ctx).Where("account_id IS NULL OR account_id = ?", accountID)
	if err := q.Model(&model.AgentBot{}).Count(&total).Error; err != nil {
		return nil, 0, err
	}

	err := q.Offset(offset).Limit(limit).
		Order("id ASC").Find(&bots).Error
	return bots, total, err
}