// Command artemis drives an Android phone over ADB wireless.
//
// This is the Phase 2 surface: act primitives on the command line. The Hub's
// HTTP action API arrives in Phase 6 and reuses these packages.
package main

import (
	"fmt"
	"os"
	"strconv"
	"time"

	"gitea.lab.audasmedia.com.au/sam/artemis_control/internal/adb"
	"gitea.lab.audasmedia.com.au/sam/artemis_control/internal/ui"
)

const usage = `artemis — drive the phone's screen over ADB wireless

usage: artemis <command> [args]

connection
  connect [host]        connect to the phone (scans ports if host given)
  devices               list adb devices
  wake                  wake the screen

reading
  dump                  print visible text nodes with bounds
  find <text>           print matching elements (no tap)
  fg                    print the foreground package

acting
  launch <package>      launch an app and wait for it to be foreground
  tap <text>            find element by text, tap its centre (FR-4)
  type <text>           type into the focused field
  swipe <x1> <y1> <x2> <y2> [ms]
  scroll <up|down>      scroll the current list
  back                  press back
  home                  press home

proof
  demo                  Phase 2 DoD: launch an app, tap a named element

environment
  ARTEMIS_PHONE         phone tailscale IP (default 100.101.49.17)
  ARTEMIS_ADB_SERIAL    pin a specific adb serial
  ARTEMIS_ADB           path to the adb binary (default: PATH)
`

func main() {
	if len(os.Args) < 2 {
		fmt.Fprint(os.Stderr, usage)
		os.Exit(2)
	}
	cmd := os.Args[1]
	args := os.Args[2:]

	r := adb.New(os.Getenv("ARTEMIS_ADB_SERIAL"))

	var err error
	switch cmd {
	case "connect":
		err = cmdConnect(r, args)
	case "devices":
		err = cmdDevices(r)
	case "wake":
		err = cmdWake(r)
	case "dump":
		err = cmdDump(r)
	case "find":
		err = cmdFind(r, args)
	case "fg":
		err = cmdFG(r)
	case "launch":
		err = cmdLaunch(r, args)
	case "tap":
		err = cmdTap(r, args)
	case "type":
		err = cmdType(r, args)
	case "swipe":
		err = cmdSwipe(r, args)
	case "scroll":
		err = cmdScroll(r, args)
	case "back":
		err = ensurePhone(r, func() error { return ui.Back(r) })
	case "home":
		err = ensurePhone(r, func() error { return ui.Home(r) })
	case "demo":
		err = cmdDemo(r)
	case "-h", "--help", "help":
		fmt.Print(usage)
		return
	default:
		err = fmt.Errorf("unknown command %q\n\n%s", cmd, usage)
	}

	if err != nil {
		fmt.Fprintf(os.Stderr, "artemis: %v\n", err)
		os.Exit(1)
	}
}

func phoneHost() string {
	if h := os.Getenv("ARTEMIS_PHONE"); h != "" {
		return h
	}
	return "100.101.49.17"
}

// ensurePhone makes sure we have a live serial before running fn.
func ensurePhone(r *adb.Runner, fn func() error) error {
	if r.Serial != "" && r.DeviceOnline(r.Serial) {
		return fn()
	}
	serial, err := r.ConnectAuto(phoneHost())
	if err != nil {
		return fmt.Errorf("phone is not reachable: %w", err)
	}
	fmt.Printf("connected to %s\n", serial)
	return fn()
}

func cmdConnect(r *adb.Runner, args []string) error {
	if len(args) > 0 {
		msg, err := r.Connect(args[0])
		if msg != "" {
			fmt.Println(msg)
		}
		return err
	}
	serial, err := r.ConnectAuto(phoneHost())
	if err != nil {
		return err
	}
	fmt.Printf("connected to %s\n", serial)
	return nil
}

func cmdDevices(r *adb.Runner) error {
	devices, err := r.Devices()
	if err != nil {
		return err
	}
	if len(devices) == 0 {
		fmt.Println("no devices")
		return nil
	}
	for _, d := range devices {
		fmt.Printf("%s\t%s\tmodel=%s device=%s\n", d.Serial, d.State, d.Model, d.Device)
	}
	return nil
}

func cmdWake(r *adb.Runner) error {
	return ensurePhone(r, func() error {
		if err := ui.Wake(r); err != nil {
			return err
		}
		fmt.Println("screen awake")
		return nil
	})
}

func cmdDump(r *adb.Runner) error {
	return ensurePhone(r, func() error {
		if err := ui.Wake(r); err != nil {
			return err
		}
		h, err := ui.Dump(r)
		if err != nil {
			return err
		}
		nodes := h.TextNodes()
		fmt.Printf("%d text nodes\n", len(nodes))
		for _, n := range nodes {
			label := n.Text
			if label == "" {
				label = n.ContentDesc
			}
			fmt.Printf("[%s] %s   bounds=%s\n", shortClass(n.Class), label, n.Bounds)
		}
		return nil
	})
}

func cmdFind(r *adb.Runner, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("usage: artemis find <text>")
	}
	return ensurePhone(r, func() error {
		h, err := ui.Dump(r)
		if err != nil {
			return err
		}
		matches := h.FindText(args[0], false)
		if len(matches) == 0 {
			return fmt.Errorf("no element matching %q", args[0])
		}
		for _, n := range matches {
			cx, cy, _ := n.Center()
			fmt.Printf("%s  centre=(%d,%d)\n", n.Label(), cx, cy)
		}
		return nil
	})
}

func cmdFG(r *adb.Runner) error {
	return ensurePhone(r, func() error {
		fg, err := ui.ForegroundPackage(r)
		if err != nil {
			return err
		}
		fmt.Println(fg)
		return nil
	})
}

func cmdLaunch(r *adb.Runner, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("usage: artemis launch <package>")
	}
	return ensurePhone(r, func() error {
		if err := ui.Wake(r); err != nil {
			return err
		}
		start := time.Now()
		if err := ui.Launch(r, args[0]); err != nil {
			return err
		}
		fmt.Printf("launched %s in %s\n", args[0], time.Since(start).Round(time.Millisecond))
		return nil
	})
}

func cmdTap(r *adb.Runner, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("usage: artemis tap <text>")
	}
	return ensurePhone(r, func() error {
		if err := ui.Wake(r); err != nil {
			return err
		}
		node, err := ui.TapText(r, args[0], false)
		if err != nil {
			return err
		}
		cx, cy, _ := node.Center()
		fmt.Printf("tapped %q at (%d,%d) — %s\n", args[0], cx, cy, node.Label())
		return nil
	})
}

func cmdType(r *adb.Runner, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("usage: artemis type <text>")
	}
	return ensurePhone(r, func() error { return ui.Type(r, args[0]) })
}

func cmdSwipe(r *adb.Runner, args []string) error {
	if len(args) < 4 || len(args) > 5 {
		return fmt.Errorf("usage: artemis swipe <x1> <y1> <x2> <y2> [ms]")
	}
	nums := make([]int, 4)
	for i, a := range args[:4] {
		v, err := strconv.Atoi(a)
		if err != nil {
			return fmt.Errorf("swipe coordinate %q is not a number", a)
		}
		nums[i] = v
	}
	ms := 300
	if len(args) == 5 {
		v, err := strconv.Atoi(args[4])
		if err != nil {
			return fmt.Errorf("swipe duration %q is not a number", args[4])
		}
		ms = v
	}
	return ensurePhone(r, func() error { return ui.Swipe(r, nums[0], nums[1], nums[2], nums[3], ms) })
}

func cmdScroll(r *adb.Runner, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("usage: artemis scroll <up|down>")
	}
	return ensurePhone(r, func() error { return ui.Scroll(r, args[0]) })
}

// cmdDemo is the Phase 2 Definition of Done, runnable on demand:
// Artemis opens a named app and taps a named element on it.
func cmdDemo(r *adb.Runner) error {
	return ensurePhone(r, func() error {
		if err := ui.Wake(r); err != nil {
			return err
		}

		fmt.Println("step 1: launch", ui.PackageSettings)
		if err := ui.Launch(r, ui.PackageSettings); err != nil {
			return err
		}

		// Launching resumes the last Settings page, so back out to the home
		// screen first to make the demo repeatable.
		const homeMarker = "Search Settings"
		for attempt := 0; attempt < 4; attempt++ {
			if _, err := ui.WaitForText(r, homeMarker, false, 3*time.Second); err == nil {
				break
			}
			if attempt == 3 {
				return fmt.Errorf("Settings home (%q) never appeared", homeMarker)
			}
			if err := ui.Back(r); err != nil {
				return err
			}
			time.Sleep(700 * time.Millisecond)
		}

		// A stable, top-level Settings entry on the Pixel 8a.
		const target = "Network and internet"
		fmt.Printf("step 2: tap %q\n", target)
		node, err := ui.TapText(r, target, false)
		if err != nil {
			return err
		}
		cx, cy, _ := node.Center()
		fmt.Printf("        tapped %s at (%d,%d)\n", node.Label(), cx, cy)

		// Prove the tap navigated: this text only exists on the target page.
		const proof = "Aeroplane mode"
		fmt.Printf("step 3: wait for %q\n", proof)
		if _, err := ui.WaitForText(r, proof, false, 10*time.Second); err != nil {
			return fmt.Errorf("tap did not open the expected page: %w", err)
		}

		fg, err := ui.ForegroundPackage(r)
		if err != nil {
			return err
		}
		fmt.Println("step 4: foreground package is", fg)
		if fg != ui.PackageSettings {
			return fmt.Errorf("expected to still be in %s after the tap, got %s", ui.PackageSettings, fg)
		}
		fmt.Println("demo OK")
		return nil
	})
}

func shortClass(class string) string {
	for i := len(class) - 1; i >= 0; i-- {
		if class[i] == '.' {
			return class[i+1:]
		}
	}
	return class
}