package main

import (
	"context"
	"fmt"
	"os"
	"os/signal"
	"runtime"
	"sort"
	"strings"
	"syscall"
	"text/tabwriter"

	"github.com/lwoodard/rtsp-streamer/internal/config"
	"github.com/lwoodard/rtsp-streamer/internal/daemon"
	"github.com/lwoodard/rtsp-streamer/internal/ipc"
	"github.com/lwoodard/rtsp-streamer/internal/protect"
	"github.com/lwoodard/rtsp-streamer/internal/tui"
	"github.com/lwoodard/rtsp-streamer/internal/viewmap"
	"github.com/spf13/cobra"
)

// versionCmd prints detailed build and runtime info.
func versionCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "version",
		Short: "Print version, git commit, and build info",
		Run: func(cmd *cobra.Command, _ []string) {
			fmt.Printf("rtsp-streamer %s\n", version)
			fmt.Printf("  commit:   %s\n", commit)
			fmt.Printf("  built:    %s\n", date)
			fmt.Printf("  go:       %s\n", runtime.Version())
			fmt.Printf("  platform: %s/%s\n", runtime.GOOS, runtime.GOARCH)
		},
	}
}

// daemonCmd runs the video wall. This is what systemd (via sway) launches.
func daemonCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "daemon",
		Short: "Run the video wall (launched by the kiosk session)",
		RunE: func(cmd *cobra.Command, _ []string) error {
			log, ring := newDaemonLogger()
			d, err := daemon.New(cfgPath, log, ring)
			if err != nil {
				return err
			}
			ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
			defer stop()

			// SIGHUP triggers a config reload via the control socket path is
			// unnecessary here; the daemon reloads on start and on demand.
			return d.Run(ctx)
		},
	}
}

// discoverCmd queries UniFi Protect and merges cameras into the config.
func discoverCmd() *cobra.Command {
	var enableRTSP string
	var asJSON bool
	c := &cobra.Command{
		Use:   "discover",
		Short: "Discover cameras from UniFi Protect and update the config",
		RunE: func(cmd *cobra.Command, _ []string) error {
			// --json reports what discovery found and writes nothing, so the
			// opentui configurator can preview the merge before saving.
			if asJSON {
				return discoverJSON(enableRTSP)
			}
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			if cfg.Controller.Host == "" {
				return fmt.Errorf("controller.host is not set; edit %s or run `rtsp-streamer config init`", cfgPath)
			}
			pw := cfg.Controller.ResolvePassword()
			if pw == "" {
				return fmt.Errorf("no controller password (set controller.password or the env var in controller.password_env)")
			}
			cl, err := protect.New(cfg.Controller.Host, cfg.Controller.RTSPPort, cfg.Controller.VerifyTLS)
			if err != nil {
				return err
			}
			ctx := context.Background()
			if err := cl.Login(ctx, cfg.Controller.Username, pw); err != nil {
				return err
			}
			cams, err := cl.Cameras(ctx)
			if err != nil {
				return err
			}

			// Qualities to ensure RTSP-enabled, e.g. --enable-rtsp=high,low
			var wantEnable []string
			for _, q := range strings.Split(enableRTSP, ",") {
				if q = strings.TrimSpace(strings.ToLower(q)); q != "" {
					wantEnable = append(wantEnable, q)
				}
			}

			added, updated, skipped := 0, 0, 0
			for i := range cams {
				cam := &cams[i]
				for _, q := range wantEnable {
					target := cam.ChannelByPreference(q)
					if target == nil {
						continue
					}
					if !target.RTSPEnabled || target.RTSPAlias == "" {
						alias, err := cl.EnableRTSP(ctx, cam.ID, target.ID)
						if err != nil {
							fmt.Fprintf(os.Stderr, "  ! %s: enable %q failed: %v\n", cam.Name, q, err)
							continue
						}
						target.RTSPEnabled, target.RTSPAlias = true, alias
						fmt.Printf("  + enabled %s on %s\n", q, cam.Name)
					}
				}
				// Record every enabled channel as a selectable quality.
				streams := map[string]string{}
				for _, ch := range cam.Channels {
					if ch.RTSPEnabled && ch.RTSPAlias != "" {
						streams[strings.ToLower(ch.Name)] = cl.StreamURL(ch.RTSPAlias)
					}
				}
				if len(streams) == 0 {
					fmt.Fprintf(os.Stderr, "  ! %s: no RTSP-enabled channel (try --enable-rtsp=high,low)\n", cam.Name)
					skipped++
					continue
				}
				entry := findByID(cfg, cam.ID)
				if entry == nil {
					entry = cfg.CameraByName(cam.Name)
				}
				if entry == nil {
					cfg.Cameras = append(cfg.Cameras, config.Camera{})
					entry = &cfg.Cameras[len(cfg.Cameras)-1]
					added++
				} else {
					updated++
				}
				entry.ID, entry.Name, entry.Streams, entry.RTSP = cam.ID, cam.Name, streams, ""
				fmt.Printf("  ✓ %-24s [%s]\n", cam.Name, strings.Join(availQual(streams), ","))
			}
			if err := config.Save(cfgPath, cfg); err != nil {
				return err
			}
			fmt.Printf("\nDiscovered %d cameras (%d added, %d updated, %d skipped). Saved to %s\n",
				len(cams), added, updated, skipped, cfgPath)
			return nil
		},
	}
	c.Flags().StringVar(&enableRTSP, "enable-rtsp", "", "comma-separated channels to enable in Protect and record, e.g. high,low")
	c.Flags().BoolVar(&asJSON, "json", false, "print results as JSON without saving the config")
	return c
}

// loginClient loads controller creds and returns a logged-in Protect client.
func loginClient(cfg *config.Config) (*protect.Client, context.Context, error) {
	if cfg.Controller.Host == "" {
		return nil, nil, fmt.Errorf("controller.host is not set")
	}
	pw := cfg.Controller.ResolvePassword()
	if pw == "" {
		return nil, nil, fmt.Errorf("no controller password (set controller.password or password_env)")
	}
	cl, err := protect.New(cfg.Controller.Host, cfg.Controller.RTSPPort, cfg.Controller.VerifyTLS)
	if err != nil {
		return nil, nil, err
	}
	ctx := context.Background()
	if err := cl.Login(ctx, cfg.Controller.Username, pw); err != nil {
		return nil, nil, err
	}
	return cl, ctx, nil
}

// viewsCmd lists or imports UniFi Protect live views as layouts.
func viewsCmd() *cobra.Command {
	c := &cobra.Command{Use: "views", Short: "List or import UniFi Protect live views"}

	ls := &cobra.Command{
		Use:   "ls",
		Short: "List the controller's saved live views",
		RunE: func(cmd *cobra.Command, _ []string) error {
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			cl, ctx, err := loginClient(cfg)
			if err != nil {
				return err
			}
			views, _, err := cl.LiveViews(ctx)
			if err != nil {
				return err
			}
			w := tabwriter.NewWriter(os.Stdout, 0, 2, 2, ' ', 0)
			fmt.Fprintln(w, "VIEW\tSLOTS\tLAYOUT")
			for _, v := range views {
				fmt.Fprintf(w, "%s\t%d\t%d\n", v.Name, len(v.Slots), v.Layout)
			}
			return w.Flush()
		},
	}

	dump := &cobra.Command{
		Use:   "dump",
		Short: "Print the raw live-view JSON (for mapping asymmetric layouts)",
		RunE: func(cmd *cobra.Command, _ []string) error {
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			cl, ctx, err := loginClient(cfg)
			if err != nil {
				return err
			}
			_, raw, err := cl.LiveViews(ctx)
			if err != nil {
				return err
			}
			fmt.Println(string(raw))
			return nil
		},
	}

	var importAll bool
	imp := &cobra.Command{
		Use:   "import [view-name]",
		Short: "Import a live view (or --all) as a layout, cameras and grid",
		RunE: func(cmd *cobra.Command, args []string) error {
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			cl, ctx, err := loginClient(cfg)
			if err != nil {
				return err
			}
			views, _, err := cl.LiveViews(ctx)
			if err != nil {
				return err
			}
			idToName := map[string]string{}
			for _, cam := range cfg.Cameras {
				if cam.ID != "" {
					idToName[cam.ID] = cam.Name
				}
			}
			imported := 0
			for _, v := range views {
				if !importAll && (len(args) == 0 || !strings.EqualFold(v.Name, args[0])) {
					continue
				}
				layout, warns := viewmap.LayoutFromView(v, idToName)
				for _, wmsg := range warns {
					fmt.Fprintf(os.Stderr, "  ! %s: %s\n", v.Name, wmsg)
				}
				if len(layout.Tiles) == 0 {
					fmt.Fprintf(os.Stderr, "  ! %s: no mappable cameras (run discover first), skipped\n", v.Name)
					continue
				}
				upsertLayout(cfg, layout)
				fmt.Printf("  ✓ imported %q as layout %q (%s, %d cameras)\n", v.Name, layout.Name, layout.Grid, len(layout.Tiles))
				imported++
			}
			if imported == 0 {
				return fmt.Errorf("no views imported (name not found? use `views ls`, or --all)")
			}
			if err := config.Save(cfgPath, cfg); err != nil {
				return err
			}
			fmt.Printf("\nImported %d view(s). Saved to %s\n", imported, cfgPath)
			return nil
		},
	}
	imp.Flags().BoolVar(&importAll, "all", false, "import every live view")

	c.AddCommand(ls, dump, imp)
	return c
}

// upsertLayout replaces a layout of the same name or appends it.
func upsertLayout(cfg *config.Config, l config.Layout) {
	for i := range cfg.Layouts {
		if cfg.Layouts[i].Name == l.Name {
			cfg.Layouts[i] = l
			return
		}
	}
	cfg.Layouts = append(cfg.Layouts, l)
}

// availQual lists the qualities present in a stream map, high to low.
func availQual(streams map[string]string) []string {
	var out []string
	for _, q := range config.Qualities {
		if streams[q] != "" {
			out = append(out, q)
		}
	}
	return out
}

func findByID(cfg *config.Config, id string) *config.Camera {
	if id == "" {
		return nil
	}
	for i := range cfg.Cameras {
		if cfg.Cameras[i].ID == id {
			return &cfg.Cameras[i]
		}
	}
	return nil
}

// layoutCmd groups layout subcommands.
func layoutCmd() *cobra.Command {
	c := &cobra.Command{Use: "layout", Short: "List or switch layouts"}

	ls := &cobra.Command{
		Use:   "ls",
		Short: "List defined layouts",
		RunE: func(cmd *cobra.Command, _ []string) error {
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			names := make([]string, 0, len(cfg.Layouts))
			for _, l := range cfg.Layouts {
				names = append(names, l.Name)
			}
			sort.Strings(names)
			for _, name := range names {
				l := cfg.LayoutByName(name)
				marker := "  "
				if l.Name == cfg.ActiveLayout {
					marker = "* "
				}
				fmt.Printf("%s%-16s %-6s %d cameras\n", marker, l.Name, l.Grid, len(l.EffectiveTiles()))
			}
			return nil
		},
	}

	set := &cobra.Command{
		Use:   "set <name>",
		Short: "Switch the active layout (live if the daemon is running)",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			name := args[0]
			// Prefer switching the live daemon; it persists the choice too.
			if resp, err := ipc.Send(ipc.Request{Cmd: "set-layout", Name: name}); err == nil {
				if !resp.OK {
					return fmt.Errorf("%s", resp.Error)
				}
				fmt.Printf("Active layout is now %q (applied live)\n", name)
				return nil
			}
			// Daemon not running: just update the config for next start.
			cfg, err := config.Load(cfgPath)
			if err != nil {
				return err
			}
			if cfg.LayoutByName(name) == nil {
				return fmt.Errorf("layout %q not found", name)
			}
			cfg.ActiveLayout = name
			if err := config.Save(cfgPath, cfg); err != nil {
				return err
			}
			fmt.Printf("Active layout set to %q (daemon not running; will apply on next start)\n", name)
			return nil
		},
	}

	c.AddCommand(ls, set)
	return c
}

// logsCmd retrieves recent daemon log lines over the control socket — the
// practical way to see why a stream is flapping on the headless kiosk.
func logsCmd() *cobra.Command {
	var n int
	c := &cobra.Command{
		Use:   "logs",
		Short: "Show recent daemon log lines (incl. mpv exit reasons)",
		RunE: func(cmd *cobra.Command, _ []string) error {
			resp, err := ipc.Send(ipc.Request{Cmd: "logs", Count: n})
			if err != nil {
				return err
			}
			if !resp.OK {
				return fmt.Errorf("%s", resp.Error)
			}
			for _, line := range resp.Logs {
				fmt.Println(line)
			}
			return nil
		},
	}
	c.Flags().IntVarP(&n, "lines", "n", 50, "show at most the most recent N lines (0 = all buffered)")
	return c
}

// restartCmd asks the running daemon to re-exec itself in place, picking up a
// freshly installed binary without a reboot or a new sway session.
func restartCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "restart",
		Short: "Restart the running daemon in place (reloads the binary; no reboot)",
		RunE: func(cmd *cobra.Command, _ []string) error {
			resp, err := ipc.Send(ipc.Request{Cmd: "restart"})
			if err != nil {
				return err
			}
			if !resp.OK {
				return fmt.Errorf("%s", resp.Error)
			}
			fmt.Println("daemon is restarting in place (picking up the installed binary)…")
			return nil
		},
	}
}

// reloadCmd tells the running daemon to re-read its config and re-apply the
// active layout. The daemon leaves streams untouched when nothing material
// changed, so this is safe to run casually.
func reloadCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "reload",
		Short: "Reload the running daemon's config and re-apply the layout",
		RunE: func(cmd *cobra.Command, _ []string) error {
			resp, err := ipc.Send(ipc.Request{Cmd: "reload"})
			if err != nil {
				return err
			}
			if !resp.OK {
				return fmt.Errorf("%s", resp.Error)
			}
			fmt.Printf("Reloaded. Active layout: %s (%d streams)\n", resp.ActiveLayout, len(resp.Slots))
			return nil
		},
	}
}

// statusCmd asks the running daemon for slot health.
func statusCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "status",
		Short: "Show the running daemon's slot health",
		RunE: func(cmd *cobra.Command, _ []string) error {
			resp, err := ipc.Send(ipc.Request{Cmd: "status"})
			if err != nil {
				return err
			}
			if !resp.OK {
				return fmt.Errorf("%s", resp.Error)
			}
			fmt.Printf("Active layout: %s\n\n", resp.ActiveLayout)
			w := tabwriter.NewWriter(os.Stdout, 0, 2, 2, ' ', 0)
			fmt.Fprintln(w, "SLOT\tCAMERA\tPID\tRUNNING\tHEALTHY")
			for _, s := range resp.Slots {
				fmt.Fprintf(w, "%d\t%s\t%d\t%v\t%v\n", s.Slot, s.Camera, s.PID, s.Running, s.Healthy)
			}
			return w.Flush()
		},
	}
}

// tuiCmd launches the interactive configurator: the opentui one by default,
// or the previous Bubble Tea implementation with --legacy. The legacy path is
// kept because on a headless Pi the TUI is the only config UI there is, and it
// needs no Bun runtime — useful if the compiled TUI is missing or misbehaves.
func tuiCmd() *cobra.Command {
	var legacy bool
	c := &cobra.Command{
		Use:     "tui",
		Aliases: []string{"config-ui"},
		Short:   "Interactive configurator (great over SSH)",
		Long: `Interactive configurator: browse cameras, place them into layout slots, pick
the active layout, discover cameras from UniFi Protect, and save — which
signals a running daemon to reload.

This runs the opentui configurator, a separate binary (rtsp-streamer-tui) built
with Bun because opentui is a TypeScript library. It is looked for at
$RTSP_STREAMER_TUI, then next to this executable, then on $PATH. Build it with
'make tui' and install it with 'make install'.

--legacy runs the previous Bubble Tea configurator instead. It is compiled into
this binary, so it needs no Bun runtime and always works — useful if the
configurator is missing or misbehaving.`,
		RunE: func(cmd *cobra.Command, _ []string) error {
			if legacy {
				return tui.Run(cfgPath)
			}
			return runTUI(cmd.Context())
		},
	}
	c.Flags().BoolVar(&legacy, "legacy", false, "use the previous Bubble Tea configurator")
	return c
}

// configCmd holds config-file utilities.
func configCmd() *cobra.Command {
	c := &cobra.Command{Use: "config", Short: "Config file helpers"}

	initCmd := &cobra.Command{
		Use:   "init",
		Short: "Write a starter config if none exists",
		RunE: func(cmd *cobra.Command, _ []string) error {
			if _, err := os.Stat(cfgPath); err == nil {
				return fmt.Errorf("config already exists at %s", cfgPath)
			}
			if err := config.Save(cfgPath, starterConfig()); err != nil {
				return err
			}
			fmt.Printf("Wrote starter config to %s\n", cfgPath)
			return nil
		},
	}

	pathCmd := &cobra.Command{
		Use:   "path",
		Short: "Print the resolved config path",
		Run:   func(cmd *cobra.Command, _ []string) { fmt.Println(cfgPath) },
	}

	editCmd := &cobra.Command{
		Use:   "validate",
		Short: "Validate the config file",
		RunE: func(cmd *cobra.Command, _ []string) error {
			if _, err := config.Load(cfgPath); err != nil {
				return err
			}
			fmt.Println("config OK")
			return nil
		},
	}

	c.AddCommand(initCmd, pathCmd, editCmd, configExportCmd(), configApplyCmd())
	return c
}

func starterConfig() *config.Config {
	c := &config.Config{
		Controller: config.Controller{
			Host:        "192.168.1.1",
			Username:    "viewer",
			PasswordEnv: "RTSP_STREAMER_PASSWORD",
			VerifyTLS:   false,
		},
		Layouts: []config.Layout{
			// Empty layouts to fill in with `rtsp-streamer tui`.
			{Name: "quad", Grid: "2x2"},
			{Name: "main-plus", Grid: "4x3"},
			{Name: "single", Grid: "1x1"},
		},
		ActiveLayout: "quad",
	}
	c.Defaults()
	return c
}