/*
Copyright 2025-2026 linux.do

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package model

import (
	"context"
	"fmt"
	"time"

	"github.com/linux-do/credit/internal/db"
	"github.com/linux-do/credit/internal/db/idgen"
	"gorm.io/gorm"
)

// TaskExecutionStatus 任务执行状态
type TaskExecutionStatus string

const (
	TaskExecutionStatusPending   TaskExecutionStatus = "pending"
	TaskExecutionStatusRunning   TaskExecutionStatus = "running"
	TaskExecutionStatusSucceeded TaskExecutionStatus = "succeeded"
	TaskExecutionStatusFailed    TaskExecutionStatus = "failed"
)

// TaskExecution 任务执行记录
type TaskExecution struct {
	ID           uint64              `json:"id,string" gorm:"primaryKey"`
	TaskID       string              `json:"task_id" gorm:"size:128;uniqueIndex;not null"`
	TaskType     string              `json:"task_type" gorm:"size:64;index;not null"`
	TaskName     string              `json:"task_name" gorm:"size:128"`
	Status       TaskExecutionStatus `json:"status" gorm:"size:32;index;not null"`
	Retryable    bool                `json:"retryable" gorm:"not null;default:false"`
	MaxRetry     int                 `json:"max_retry" gorm:"not null;default:0"`
	RetryCount   int                 `json:"retry_count" gorm:"not null;default:0"`
	Log          string              `json:"log" gorm:"type:text"`
	ErrorMessage string              `json:"error_message" gorm:"type:text"`
	Result       string              `json:"result" gorm:"type:text"`
	StartedAt    *time.Time          `json:"started_at" gorm:"index"`
	FinishedAt   *time.Time          `json:"finished_at"`
	Duration     int64               `json:"duration" gorm:"comment:耗时毫秒"`
	Payload      string              `json:"payload" gorm:"type:text"`
	TriggeredBy  string              `json:"triggered_by" gorm:"size:32;not null;default:system"`
	CreatedAt    time.Time           `json:"created_at" gorm:"autoCreateTime;index"`
	UpdatedAt    time.Time           `json:"updated_at" gorm:"autoUpdateTime"`
}

// TableName 表名
func (TaskExecution) TableName() string {
	return "task_executions"
}

// CreateTaskExecution 创建任务执行记录
func CreateTaskExecution(ctx context.Context, execution *TaskExecution) error {
	execution.ID = idgen.NextUint64ID()
	return db.DB(ctx).Create(execution).Error
}

// UpdateTaskExecution 更新任务执行记录
func UpdateTaskExecution(ctx context.Context, execution *TaskExecution) error {
	return db.DB(ctx).Save(execution).Error
}

// GetTaskExecutionByTaskID 根据 TaskID 获取执行记录
func GetTaskExecutionByTaskID(ctx context.Context, taskID string) (*TaskExecution, error) {
	var execution TaskExecution
	if err := db.DB(ctx).Where("task_id = ?", taskID).First(&execution).Error; err != nil {
		return nil, err
	}
	return &execution, nil
}

// GetTaskExecutionByID 根据 ID 获取执行记录
func GetTaskExecutionByID(ctx context.Context, id uint64) (*TaskExecution, error) {
	var execution TaskExecution
	if err := db.DB(ctx).Where("id = ?", id).First(&execution).Error; err != nil {
		return nil, err
	}
	return &execution, nil
}

// AppendTaskExecutionLog 追加日志到执行记录
func AppendTaskExecutionLog(ctx context.Context, taskID string, logLine string) error {
	now := time.Now().Format("15:04:05")
	line := fmt.Sprintf("[%s] %s\n", now, logLine)
	return db.DB(ctx).Model(&TaskExecution{}).
		Where("task_id = ?", taskID).
		Update("log", gorm.Expr("COALESCE(log, '') || ?", line)).Error
}

// ListTaskExecutionsRequest 查询任务执行记录列表请求
type ListTaskExecutionsRequest struct {
	Status   string `form:"status"`
	TaskType string `form:"task_type"`
	Page     int    `form:"page"`
	PageSize int    `form:"page_size"`
}

// ListTaskExecutions 分页查询任务执行记录
func ListTaskExecutions(ctx context.Context, req ListTaskExecutionsRequest) ([]TaskExecution, int64, error) {
	if req.Page <= 0 {
		req.Page = 1
	}
	if req.PageSize <= 0 {
		req.PageSize = 20
	}

	query := db.DB(ctx).Model(&TaskExecution{})

	if req.Status != "" {
		query = query.Where("status = ?", req.Status)
	}
	if req.TaskType != "" {
		query = query.Where("task_type = ?", req.TaskType)
	}

	var total int64
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	var executions []TaskExecution
	offset := (req.Page - 1) * req.PageSize
	if err := query.Order("id DESC").Offset(offset).Limit(req.PageSize).Find(&executions).Error; err != nil {
		return nil, 0, err
	}

	return executions, total, nil
}