package store

import (
	"context"
	"time"
)

// TenantInitializationResult reports how many missing defaults were created.
// Existing tenant customizations are deliberately left untouched.
type TenantInitializationResult struct {
	WorkbenchApps    int64
	AttendanceRules  int64
	AttendanceShifts int64
	MailboxConfigs   int64
	FeedbackConfigs  int64
}

// InitializeTenantDefaults creates the minimum workbench data required by a tenant.
// Tenant-scoped unique indexes make this operation safe to retry.
func (s *Store) InitializeTenantDefaults(ctx context.Context) (*TenantInitializationResult, error) {
	tx, err := s.db.BeginTxx(ctx, nil)
	if err != nil {
		return nil, err
	}
	defer func() { _ = tx.Rollback() }()

	now := time.Now().UTC().Round(time.Millisecond)
	tenantID := s.tenant()
	result := &TenantInitializationResult{}

	apps := []struct {
		code, name, route string
		sort              int
	}{
		{code: "attendance", name: "打卡", route: "/attendance", sort: 10},
		{code: "monthly_reports", name: "月报", route: "/reports/monthly", sort: 20},
		{code: "daily_reports", name: "日报", route: "/reports/daily", sort: 30},
		{code: "organization", name: "部门框架", route: "/organization", sort: 40},
		{code: "executive_mailbox", name: "举报信箱", route: "/executive-mailbox", sort: 50},
		{code: "meetings", name: "会议通知", route: "/meetings", sort: 60},
		{code: "meeting_notes", name: "会议笔记", route: "/meeting-notes", sort: 70},
	}
	for _, app := range apps {
		res, execErr := tx.ExecContext(ctx, `INSERT INTO im_workbench_apps
			(tenant_id,code,name,icon_file_id,route,sort_order,unread_key,enabled,permission,created_at,updated_at)
			SELECT ?,?,?,?,?,?,?,?,?,?,?
			WHERE NOT EXISTS (
				SELECT 1 FROM im_workbench_apps WHERE tenant_id=? AND code=?
			)`,
			tenantID, app.code, app.name, "", app.route, app.sort, "", 1, "enabled", now, now,
			tenantID, app.code)
		if execErr != nil {
			return nil, execErr
		}
		rows, _ := res.RowsAffected()
		result.WorkbenchApps += rows
	}

	res, err := tx.ExecContext(ctx, `INSERT INTO im_attendance_rules
		(tenant_id,rule_id,name,workday,location_required,wifi_required,allow_outside_checkin,appeal_allowed,effective_from,effective_to,state,created_at,updated_at)
		SELECT ?,?,?,?,?,?,?,?,CURDATE(),NULL,'active',?,?
		WHERE NOT EXISTS (
			SELECT 1 FROM im_attendance_rules WHERE tenant_id=? AND rule_id=?
		)`,
		tenantID, "att_rule_default", "默认考勤规则", "1,2,3,4,5", 0, 0, 1, 1, now, now,
		tenantID, "att_rule_default")
	if err != nil {
		return nil, err
	}
	result.AttendanceRules, _ = res.RowsAffected()

	res, err = tx.ExecContext(ctx, `INSERT INTO im_attendance_shifts
		(tenant_id,shift_id,rule_id,name,work_start,work_end,checkin_start,checkout_end,state,sort_order,created_at,updated_at)
		SELECT ?,?,?,?,?,?,?,?,?,?,?,?
		WHERE NOT EXISTS (
			SELECT 1 FROM im_attendance_shifts WHERE tenant_id=? AND shift_id=?
		)`,
		tenantID, "shift_default", "att_rule_default", "默认班次", "09:00:00", "18:00:00", "08:00:00", "19:00:00", "active", 10, now, now,
		tenantID, "shift_default")
	if err != nil {
		return nil, err
	}
	result.AttendanceShifts, _ = res.RowsAffected()

	res, err = tx.ExecContext(ctx, `INSERT INTO im_mailbox_config
		(tenant_id,enabled,allow_anonymous,required_fields,max_length,attachment_policy,notice_title,notice_content,notice_updated_at,created_at,updated_at)
		SELECT ?,1,1,?,5000,?,'总经理信箱','请如实填写诉求。',?,?,?
		WHERE NOT EXISTS (
			SELECT 1 FROM im_mailbox_config WHERE tenant_id=?
		)`,
		tenantID, `["subject","content"]`, `{"max_files":5,"purpose":"executive_mailbox"}`, now, now, now,
		tenantID)
	if err != nil {
		return nil, err
	}
	result.MailboxConfigs, _ = res.RowsAffected()

	res, err = tx.ExecContext(ctx, `INSERT INTO im_feedback_config
		(tenant_id,categories,max_length,attachment_policy,allow_contact,diagnostics_notice,created_at,updated_at)
		SELECT ?,?,2000,?,1,'',?,?
		WHERE NOT EXISTS (
			SELECT 1 FROM im_feedback_config WHERE tenant_id=?
		)`,
		tenantID, `["bug","suggestion","complaint","other"]`, `{"max_files":5,"purpose":"feedback"}`, now, now,
		tenantID)
	if err != nil {
		return nil, err
	}
	result.FeedbackConfigs, _ = res.RowsAffected()

	if err = tx.Commit(); err != nil {
		return nil, err
	}
	return result, nil
}