package plc

import (
	"context"
	"errors"
	"sync"
)

// mockClient 模拟西门子 PLC：下发成功即认为写入寄存器，完成信号由外部置位。
type mockClient struct {
	ack  bool
	sent string
	mu   sync.RWMutex
	// dockPallet 模拟接驳台是否有托盘：默认全部无托盘；联调时可用 SetDockPallet 置位
	dockPallet map[string]bool
}

func newMockClient() *mockClient {
	return &mockClient{dockPallet: map[string]bool{}}
}

// SetDockPallet 手动设置某接驳台是否有托盘（供联调/测试用）
func (m *mockClient) SetDockPallet(dockCode string, has bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.dockPallet[dockCode] = has
}

func (m *mockClient) SendProcessCode(_ context.Context, combination string) ([]int, error) {
	codes := parseCombination(combination)
	m.sent = combination
	m.ack = false
	return codes, nil
}

func (m *mockClient) QueryDone(_ context.Context) (bool, error) {
	if m.sent == "" {
		return false, errors.New("no process sent")
	}
	// 模拟：假设 PLC 已完成，30 秒后返回完成信号
	return m.ack, nil
}

func (m *mockClient) AckDone(_ context.Context, ok bool) {
	m.ack = ok
}

func (m *mockClient) QueryDockPallet(_ context.Context, dockCode string) (bool, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	return m.dockPallet[dockCode], nil
}