package store

import (
	"context"
	"time"
)

// 全平台任务观测（管理端「运行观测」页）。系统级口径：跨租户看所有任务，
// 故走 WithoutTenant 旁路租户插件 + raw Table 查询（同 RecentRuns 手动控制过滤）。

// AdminTaskRow 是管理端任务流一行：任务 + 租户名 + 提交人邮箱 + 评测分级（LEFT JOIN）。
type AdminTaskRow struct {
	TaskID      string    `json:"task_id"`
	TenantID    string    `json:"tenant_id"`
	TenantName  string    `json:"tenant_name"`
	Owner       string    `json:"owner"`
	OwnerEmail  string    `json:"owner_email"`
	Status      string    `json:"status"`
	Detail      string    `json:"detail"`
	Topic       string    `json:"topic"`
	At          time.Time `json:"at"`
	EvalLevel   string    `json:"eval_level"`
	EvalOverall float64   `json:"eval_overall"`
}

// AllTasks 全平台任务流（管理端观测；可按状态/租户过滤）。倒序，翻页。
// status 空=全部；tenantID 空=全租户。
func (p *Postgres) AllTasks(ctx context.Context, status, tenantID string, limit int) []AdminTaskRow {
	if p.db == nil {
		return nil
	}
	if limit <= 0 || limit > 200 {
		limit = 50
	}
	ctx = WithoutTenant(ctx) // 系统级：看所有租户的任务
	q := p.db.WithContext(ctx).Table("sundynix_task as t").
		Select("t.task_id, t.tenant_id, t.owner, t.status, t.detail, t.created_at as at, " +
			"coalesce(tn.name,'') as tenant_name, coalesce(u.email,'') as owner_email, " +
			"coalesce(e.level,'') as eval_level, coalesce(e.overall,0) as eval_overall, " +
			"coalesce(t.graph->>'topic','') as topic").
		Joins("left join sundynix_tenant tn on tn.id = t.tenant_id").
		Joins("left join sundynix_user u on u.id = t.owner").
		Joins("left join sundynix_eval e on e.task_id = t.task_id").
		Where("t.deleted_at is null")
	if status != "" {
		q = q.Where("t.status = ?", status)
	}
	if tenantID != "" {
		q = q.Where("t.tenant_id = ?", tenantID)
	}
	var out []AdminTaskRow
	q.Order("t.created_at desc").Limit(limit).Scan(&out)
	return out
}

// TaskStatusCounts 全平台任务按状态计数（观测页的筛选标签 + 分布）。
func (p *Postgres) TaskStatusCounts(ctx context.Context) map[string]int64 {
	out := map[string]int64{}
	if p.db == nil {
		return out
	}
	ctx = WithoutTenant(ctx)
	var rows []struct {
		Status string
		N      int64
	}
	p.db.WithContext(ctx).Table("sundynix_task").
		Select("status, count(*) as n").
		Where("deleted_at is null").
		Group("status").Scan(&rows)
	for _, r := range rows {
		out[r.Status] = r.N
	}
	return out
}