// Package docker — lapisan tipis di atas Docker SDK untuk core tia.
// Bebas UI: dipakai bersama oleh TUI dan CLI (F-028).
package docker

import (
	"context"
	"fmt"
	"strings"

	"github.com/docker/docker/api/types/container"
	"github.com/docker/docker/client"
)

// Client — pembungkus Docker SDK dengan negosiasi versi API
// (mendukung Docker Engine 20.10+, PRD §9).
type Client struct {
	cli *client.Client
}

// New membaca konfigurasi dari env (DOCKER_HOST dll) atau default socket.
func New() (*Client, error) {
	cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
	if err != nil {
		return nil, fmt.Errorf("docker: create client: %w", err)
	}
	return &Client{cli: cli}, nil
}

func (c *Client) Close() error { return c.cli.Close() }

// Info — ringkasan daemon untuk dashboard, doctor, dan status bar.
type Info struct {
	ServerVersion string
	APIVersion    string
	Containers    int
	Running       int
	Images        int
	MemoryTotal   int64
	CPUs          int
}

func (c *Client) Info(ctx context.Context) (Info, error) {
	i, err := c.cli.Info(ctx)
	if err != nil {
		return Info{}, fmt.Errorf("docker: info: %w", err)
	}
	return Info{
		ServerVersion: i.ServerVersion,
		APIVersion:    c.cli.ClientVersion(), // hasil negosiasi API
		Containers:    i.Containers,
		Running:       i.ContainersRunning,
		Images:        i.Images,
		MemoryTotal:   i.MemTotal,
		CPUs:          i.NCPU,
	}, nil
}

// Ping — cek daemon hidup (dipakai doctor).
func (c *Client) Ping(ctx context.Context) error {
	if _, err := c.cli.Ping(ctx); err != nil {
		return fmt.Errorf("docker: ping: %w", err)
	}
	return nil
}

// Container — ringkasan kontainer untuk sidebar/dashboard.
type Container struct {
	ID     string
	Name   string
	Image  string
	State  string // running, exited, paused, restarting, created, dead
	Status string // "Up 2 hours (healthy)"
}

// ListContainers mengembalikan semua kontainer (termasuk yang berhenti).
func (c *Client) ListContainers(ctx context.Context) ([]Container, error) {
	list, err := c.cli.ContainerList(ctx, container.ListOptions{All: true})
	if err != nil {
		return nil, fmt.Errorf("docker: container list: %w", err)
	}
	out := make([]Container, 0, len(list))
	for _, ct := range list {
		name := ""
		if len(ct.Names) > 0 {
			name = strings.TrimPrefix(ct.Names[0], "/")
		}
		id := ct.ID
		if len(id) > 12 {
			id = id[:12]
		}
		out = append(out, Container{
			ID:     id,
			Name:   name,
			Image:  ct.Image,
			State:  ct.State,
			Status: ct.Status,
		})
	}
	return out, nil
}