package agentapi

import (
	"context"
	"encoding/json"
	"fmt"
	"time"
)

// LineTestState mirrors the agent's GET /host/line-test (agent ≥ 0.164.0; felhom.eu R-1247): the host's weekly upload
// line test — a 10-second iperf3 upload to ep0 inside the offsite tunnel, best of three runs, as ep0's server counted
// it. Present=false: never measured (no tunnel, not yet due, or disabled). An agent before the route answers 404 (a
// *StatusError); all three mean UNKNOWN, and the controller then sets no qBittorrent limit.
type LineTestState struct {
	Present    bool    `json:"present"`
	Mbps       float64 `json:"mbps,omitempty"`
	MeasuredAt string  `json:"measured_at,omitempty"` // RFC3339 UTC
	Method     string  `json:"method,omitempty"`
}

// LineTest calls GET /host/line-test.
func (c *Client) LineTest(ctx context.Context) (LineTestState, error) {
	var out LineTestState
	body, err := c.get(ctx, "/host/line-test")
	if err != nil {
		return out, err
	}
	if err := json.Unmarshal(body, &out); err != nil {
		return out, fmt.Errorf("agentapi: decode /host/line-test: %w", err)
	}
	return out, nil
}

// MeasuredAtTime parses MeasuredAt (zero time when absent or garbled).
func (s LineTestState) MeasuredAtTime() time.Time {
	t, _ := time.Parse(time.RFC3339, s.MeasuredAt)
	return t
}