package dao

import (
	"context"
	"fmt"
	"time"

	"model-gateway/consts/public"
	"model-gateway/model/entity"

	"gitea.com/red-future/common/db/gfdb"
	"github.com/gogf/gf/v2/database/gdb"
	"github.com/gogf/gf/v2/os/gtime"
	"github.com/gogf/gf/v2/util/gconv"
)

var Task = &taskDao{}

type taskDao struct{}

func (d *taskDao) Insert(ctx context.Context, t *entity.AsynchTask) (id int64, err error) {
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).Data(t).Insert()
	if err != nil {
		return 0, err
	}
	return r.LastInsertId()
}

func (d *taskDao) GetByTaskID(ctx context.Context, taskID string) (t *entity.AsynchTask, err error) {
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.TaskID, taskID).
		One()
	if err != nil {
		return nil, err
	}
	if r.IsEmpty() {
		return nil, nil
	}
	err = r.Struct(&t)
	return
}

// ListByTaskIDs 批量查询任务（会受 gfdb 的租户 Hook 影响，只返回当前租户数据）
func (d *taskDao) ListByTaskIDs(ctx context.Context, taskIDs []string) (list []*entity.AsynchTask, err error) {
	if len(taskIDs) == 0 {
		return nil, nil
	}
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		WhereIn(entity.AsynchTaskCol.TaskID, taskIDs).
		All()
	if err != nil {
		return nil, err
	}
	err = r.Structs(&list)
	return
}

// MarkDownloadedByID 将成功任务标记为已下载(state=4)，并写入过期时间
func (d *taskDao) MarkDownloadedByID(ctx context.Context, id int64, expireAt *gtime.Time) error {
	data := gdb.Map{
		entity.AsynchTaskCol.State:    4,
		entity.AsynchTaskCol.ExpireAt: expireAt,
		entity.AsynchTaskCol.Updater:  "",
	}
	_, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.Id, id).
		Where(entity.AsynchTaskCol.State, 2).
		Data(data).
		Update()
	return err
}

func (d *taskDao) UpdateRunning(ctx context.Context, id int64) error {
	now := gtime.Now()
	data := gdb.Map{
		entity.AsynchTaskCol.State:     1,
		entity.AsynchTaskCol.StartedAt: now,
		entity.AsynchTaskCol.Updater:   "",
	}
	_, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.Id, id).
		Data(data).
		Update()
	return err
}

func (d *taskDao) UpdateSuccess(ctx context.Context, id int64, ossFile, fileType string, fileSize int64, expireAt *gtime.Time) error {
	now := gtime.Now()
	data := gdb.Map{
		entity.AsynchTaskCol.State:      2,
		entity.AsynchTaskCol.OssFile:    ossFile,
		entity.AsynchTaskCol.FileType:   fileType,
		entity.AsynchTaskCol.FileSize:   fileSize,
		entity.AsynchTaskCol.ErrorMsg:   "",
		entity.AsynchTaskCol.FinishedAt: now,
		entity.AsynchTaskCol.ExpireAt:   expireAt,
		entity.AsynchTaskCol.Updater:    "",
	}
	_, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.Id, id).
		Data(data).
		Update()
	return err
}

func (d *taskDao) UpdateFailed(ctx context.Context, id int64, errorMsg string) error {
	now := gtime.Now()
	data := gdb.Map{
		entity.AsynchTaskCol.State:      3,
		entity.AsynchTaskCol.ErrorMsg:   errorMsg,
		entity.AsynchTaskCol.FinishedAt: now,
		entity.AsynchTaskCol.Updater:    "",
	}
	_, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.Id, id).
		Data(data).
		Update()
	return err
}

func (d *taskDao) SoftDeleteByTaskID(ctx context.Context, taskID string) (rows int64, err error) {
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.TaskID, taskID).
		Delete()
	if err != nil {
		return 0, err
	}
	return r.RowsAffected()
}

// CountActiveByModel 统计某模型排队中/执行中的任务数，用于 queue_limit 限制（近似值）
func (d *taskDao) CountActiveByModel(ctx context.Context, modelName string) (int64, error) {
	n, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.ModelName, modelName).
		WhereIn(entity.AsynchTaskCol.State, []int{0, 1}).
		Count()
	return int64(n), err
}

// List 任务分页查询（受 gfdb 租户 Hook 影响）
func (d *taskDao) List(ctx context.Context, pageNum, pageSize int, modelNameLike, taskIDLike string, state *int) (list []*entity.AsynchTask, total int64, err error) {
	m := gfdb.DB(ctx).Model(ctx, public.TableNameTask).Where("deleted_at IS NULL")
	if modelNameLike != "" {
		m = m.WhereLike(entity.AsynchTaskCol.ModelName, "%"+modelNameLike+"%")
	}
	if taskIDLike != "" {
		m = m.WhereLike(entity.AsynchTaskCol.TaskID, "%"+taskIDLike+"%")
	}
	if state != nil {
		m = m.Where(entity.AsynchTaskCol.State, *state)
	}
	m = m.OrderDesc(entity.AsynchTaskCol.CreatedAt)
	if pageNum > 0 && pageSize > 0 {
		m = m.Page(pageNum, pageSize)
	}
	r, totalInt, err := m.AllAndCount(false)
	if err != nil {
		return nil, 0, err
	}
	total = gconv.Int64(totalInt)
	err = r.Structs(&list)
	return
}

// ClaimPending 抢占 pending 任务（state=0），并在同一事务中更新为 running（state=1）
// 使用 PostgreSQL: FOR UPDATE SKIP LOCKED 避免多 worker 重复消费
func (d *taskDao) ClaimPending(ctx context.Context, batchSize int) (tasks []*entity.AsynchTask, err error) {
	if batchSize <= 0 {
		batchSize = 1
	}
	err = gfdb.DB(ctx).Transaction(ctx, func(ctx context.Context, tx gdb.TX) error {
		sql := fmt.Sprintf(
			`SELECT id, tenant_id, model_name, task_id, input_ref, request_payload
			   FROM %s
			  WHERE deleted_at IS NULL AND state = 0
			  ORDER BY created_at ASC
			  LIMIT %d
			  FOR UPDATE SKIP LOCKED`,
			public.TableNameTask,
			batchSize,
		)
		r, err := tx.GetAll(sql)
		if err != nil {
			return err
		}
		if r.IsEmpty() {
			tasks = nil
			return nil
		}
		if err := r.Structs(&tasks); err != nil {
			return err
		}
		// 更新为 running
		now := time.Now()
		for _, t := range tasks {
			// tx.Model 不走 gfdb Hook，这里手动更新必要字段
			_, err = tx.Exec(
				fmt.Sprintf(`UPDATE %s SET state=1, started_at=?, updated_at=? WHERE id=?`, public.TableNameTask),
				now, now, t.Id,
			)
			if err != nil {
				return err
			}
		}
		return nil
	})
	return
}

// ListExpiredSuccess 获取已成功且过期的任务
func (d *taskDao) ListExpiredSuccess(ctx context.Context, limit int) (list []*entity.AsynchTask, err error) {
	if limit <= 0 {
		limit = 100
	}
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		Where(entity.AsynchTaskCol.State, 2).
		Where(entity.AsynchTaskCol.ExpireAt+" IS NOT NULL").
		Where(entity.AsynchTaskCol.ExpireAt+" < ?", gtime.Now()).
		Limit(limit).
		All()
	if err != nil {
		return nil, err
	}
	err = r.Structs(&list)
	return
}

// ListTimeoutTasks 获取超时的排队/执行中任务
func (d *taskDao) ListTimeoutTasks(ctx context.Context, timeout time.Duration, limit int) (list []*entity.AsynchTask, err error) {
	if limit <= 0 {
		limit = 100
	}
	deadline := gtime.New(time.Now().Add(-timeout))
	r, err := gfdb.DB(ctx).Model(ctx, public.TableNameTask).
		WhereIn(entity.AsynchTaskCol.State, []int{0, 1}).
		Where(entity.AsynchTaskCol.UpdatedAt+" < ?", deadline).
		Limit(limit).
		All()
	if err != nil {
		return nil, err
	}
	err = r.Structs(&list)
	return
}

// DebugPing 用于启动时检测数据库连通性（可选）
func (d *taskDao) DebugPing(ctx context.Context) error {
	_, err := gfdb.DB(ctx).GetAll(ctx, "SELECT 1")
	return err
}