// models/task.go
package models

import (
	"context"
	"fmt"
	"go-policy-service/config"
	"time"

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

var db *gorm.DB

type Task struct {
	gorm.Model
	Params    string `gorm:"type:text"`
	Status    string `gorm:"type:varchar(20)"`
	Result    string `gorm:"type:text"`
	Attempts  int    `gorm:"default:0"`
	NextTryAt time.Time
}

type ProcessedData struct {
	gorm.Model
	TaskID uint
	Data   string `gorm:"type:text"`
}

func InitDB(cfg *config.Config) error {
	dsn := getDSN(cfg)
	conn, err := gorm.Open(mysql.Open(dsn), &gorm.Config{})
	if err != nil {
		return err
	}

	db = conn
	// 自动迁移表结构
	if err := db.AutoMigrate(&Task{}, &ProcessedData{}); err != nil {
		return err
	}
	return nil
}

func getDSN(cfg *config.Config) string {
	return fmt.Sprintf("%s:%s@tcp(%s:%d)/%s?charset=utf8mb4",
		cfg.DBUser,
		cfg.DBPassword,
		cfg.DBHost,
		cfg.DBPort,
		cfg.DBName)
}

func GetPendingTasks(ctx context.Context, limit int) ([]Task, error) {
	var tasks []Task
	result := db.WithContext(ctx).
		Where("status = ? AND next_try_at <= ?", "pending", time.Now()).
		Limit(limit).
		Find(&tasks)
	return tasks, result.Error
}

func SaveProcessedData(ctx context.Context, data *ProcessedData) error {
	return db.WithContext(ctx).Create(data).Error
}

func UpdateTaskStatus(ctx context.Context, taskID uint, status string, attempts int) error {
	return db.WithContext(ctx).
		Model(&Task{}).
		Where("id = ?", taskID).
		Updates(map[string]interface{}{
			"status":      status,
			"attempts":    attempts,
			"next_try_at": time.Now().Add(5 * time.Minute),
		}).Error
}