// Package bbc is the BBC iPlayer app module: clear DASH/HLS captured through
// transparent MITM (UK VPN stays on). Only the manifest URL is required — no
// Widevine keys for the mobile-phone-main mediaset streams we capture.
package bbc

import (
	"flag"
	"fmt"
	"os"
	"time"

	"drmdecryption/adb"
	appreg "drmdecryption/app"
	"drmdecryption/capture"
	"drmdecryption/modules/provider"
	"drmdecryption/mpd"
	"drmdecryption/uiflow"
)

func init() {
	appreg.Register(Name, New)
	appreg.RegisterFlags(bindFlags)
}

func bindFlags(fs *flag.FlagSet) {
	fs.StringVar(&flags.packageName, Name+".package", "", "override "+Name+" android package id")
	fs.StringVar(&flags.caHash, Name+".ca-hash", "", "override "+Name+" MITM CA subject hash")
	fs.StringVar(&flags.proxyBin, Name+".proxy-bin", "", "override "+Name+" on-device MITM binary")
}

// App is the BBC iPlayer plugin.
type App struct {
	*provider.Base
	cfg Config
}

// New constructs the plugin from module.yaml + flags + env.
func New() (appreg.App, error) {
	cfg, res, err := loadConfig()
	if err != nil {
		return nil, err
	}
	labels := make(map[string]string, len(cfg.Channels))
	for id, ch := range cfg.Channels {
		labels[id] = ch.Label
	}
	return &App{Base: provider.New(Name, cfg.Common, labels, res), cfg: cfg}, nil
}

// KeyMode none: mobile streams are clear (CDN signed URLs); no wvkey.
func (a *App) KeyMode() string { return "none" }

// CaptureHints: only the MPD/HLS master from mediaselector is required.
func (a *App) CaptureHints() capture.Hints {
	return a.Hints("mpd")
}

// UseTransparentMITM: NordVPN UK conflicts with Wi‑Fi http_proxy.
func (a *App) UseTransparentMITM() bool { return true }

// MPDRewriter: passthrough — no rewrite needed for clear BBC DASH.
func (a *App) MPDRewriter() mpd.Rewriter { return mpd.Passthrough{} }

// Channels lists configured live targets.
func (a *App) Channels() []appreg.Channel {
	out := make([]appreg.Channel, 0, len(a.cfg.Channels))
	for _, id := range a.ChannelIDs() {
		out = append(out, appreg.Channel{ID: id, Label: a.Label(id)})
	}
	return out
}

// Launch cold-starts iPlayer.
func (a *App) Launch(c *adb.Client) error {
	c.EnsureAwake()
	fmt.Printf("[*] Launching %s (%s)…\n", Name, a.Package())
	c.ForceStop(a.Package())
	time.Sleep(400 * time.Millisecond)
	if err := uiflow.MonkeyLaunch(c, a.Package()); err != nil {
		return err
	}
	time.Sleep(time.Duration(a.cfg.Timeouts.LaunchSettle))
	c.DismissShadeIfFocused()
	if err := uiflow.WaitUI(c, a.CacheDir(), uiflow.Match{
		DescContains:     a.cfg.UI.LaunchDescContains,
		ResourceContains: a.cfg.UI.LaunchResourceContains,
	}, time.Duration(a.cfg.Timeouts.LaunchWaitUI)); err != nil {
		fmt.Fprintf(os.Stderr, "[!] launch UI wait: %v — continue and play manually\n", err)
	}
	return nil
}

// AutoPlay: best-effort; iPlayer UI varies — operator can play by hand.
func (a *App) AutoPlay(c *adb.Client, channel string) error {
	id, err := a.Resolve(channel)
	if err != nil {
		return err
	}
	ch := a.cfg.Channels[id]
	fmt.Printf("[*] Auto-play %s — open Live and start playback on the phone…\n", a.Label(id))
	if ch.VPID != "" {
		fmt.Printf("    expected mediaselector vpid ≈ %s\n", ch.VPID)
	}
	c.DismissShadeIfFocused()
	if len(ch.PlayDesc) == 0 && len(ch.ChipDesc) == 0 {
		return fmt.Errorf("no UI selectors for %s — play manually on the phone", id)
	}
	if len(ch.ChipDesc) > 0 {
		if err := uiflow.TapUI(c, a.CacheDir(), uiflow.Match{DescRE: ch.ChipDesc}, 20*time.Second); err != nil {
			return fmt.Errorf("channel chip: %w", err)
		}
		time.Sleep(2 * time.Second)
	}
	if len(ch.PlayDesc) > 0 {
		if err := uiflow.TapUI(c, a.CacheDir(), uiflow.Match{DescRE: ch.PlayDesc}, 15*time.Second); err != nil {
			return fmt.Errorf("play: %w", err)
		}
	}
	return uiflow.WaitPlayback(c, a.CacheDir(), a.Package(), uiflow.PlaybackOpts{
		Timeout: time.Duration(a.cfg.Timeouts.Playback),
	})
}

// StreamDefaults for clear live DASH.
func (a *App) VideoSelect() string  { return "res=1280x720:for=best" }
func (a *App) AudioSelect() string  { return "lang=en:for=best" }
func (a *App) RewriterName() string { return "none" }
func (a *App) LiveWaitSeconds() int { return 2 }
func (a *App) TSReadyBytes() int64  { return 256 << 10 }