package cmd

import (
	"fmt"
	"time"

	"github.com/charmbracelet/log"
	"github.com/onyx-and-iris/xair-cli/internal/xair"
	"github.com/spf13/cobra"
)

// headampCmd represents the headamp command
var headampCmd = &cobra.Command{
	Short: "Commands to control headamp gain and phantom power",
	Long: `Commands to control the headamp gain and phantom power settings of the XAir mixer.

You can get or set the gain level for individual headamps, as well as enable or disable phantom power.`,
	Use: "headamp",
	Run: func(cmd *cobra.Command, args []string) {
		cmd.Help()
	},
}

// headampGainCmd represents the headamp gain command
var headampGainCmd = &cobra.Command{
	Use:   "gain",
	Short: "Get or set headamp gain level",
	Long: `Get or set the gain level for a specified headamp index.
When setting gain, it will gradually increase from the current level to prevent 
sudden jumps that could cause feedback or equipment damage.

Examples:
  # Get gain level for headamp index 1
  xair-cli headamp gain 1
  # Set gain level for headamp index 1 to 3.5 dB (gradually over 5 seconds)
  xair-cli headamp gain 1 3.5
  # Set gain level for headamp index 1 to 3.5 dB over 10 seconds
  xair-cli headamp gain 1 3.5 --duration 10s`,
	Args: cobra.RangeArgs(1, 2),
	RunE: func(cmd *cobra.Command, args []string) error {
		client := ClientFromContext(cmd.Context())
		if client == nil {
			return fmt.Errorf("OSC client not found in context")
		}

		if len(args) < 1 {
			return fmt.Errorf("Please provide a headamp index")
		}

		index := mustConvToInt(args[0])

		if len(args) == 1 {
			gain, err := client.HeadAmp.Gain(index)
			if err != nil {
				return fmt.Errorf("Error getting headamp gain level: %w", err)
			}
			cmd.Printf("Headamp %d Gain: %.2f dB\n", index, gain)
			return nil
		}

		if len(args) < 2 {
			return fmt.Errorf("Please provide a gain level in dB")
		}

		targetLevel := mustConvToFloat64(args[1])

		currentGain, err := client.HeadAmp.Gain(index)
		if err != nil {
			return fmt.Errorf("Error getting current headamp gain level: %w", err)
		}

		duration, err := cmd.Flags().GetDuration("duration")
		if err != nil {
			return fmt.Errorf("Error getting duration flag: %w", err)
		}

		if currentGain == targetLevel {
			cmd.Printf("Headamp %d Gain already at %.2f dB\n", index, targetLevel)
			return nil
		}

		if err := gradualGainAdjust(client, cmd, index, currentGain, targetLevel, duration); err != nil {
			return fmt.Errorf("Error adjusting headamp gain level: %w", err)
		}

		cmd.Printf("Headamp %d Gain set to %.2f dB\n", index, targetLevel)
		return nil
	},
}

// gradualGainAdjust gradually adjusts gain from current to target over specified duration
func gradualGainAdjust(
	client *xair.Client,
	cmd *cobra.Command,
	index int,
	currentGain, targetGain float64,
	duration time.Duration,
) error {
	gainDiff := targetGain - currentGain

	stepInterval := 100 * time.Millisecond
	totalSteps := int(duration / stepInterval)

	if totalSteps < 1 {
		totalSteps = 1
		stepInterval = duration
	}

	stepIncrement := gainDiff / float64(totalSteps)

	log.Debugf("Adjusting Headamp %d gain from %.2f dB to %.2f dB over %v...\n",
		index, currentGain, targetGain, duration)

	for step := 1; step <= totalSteps; step++ {
		newGain := currentGain + (stepIncrement * float64(step))

		if step == totalSteps {
			newGain = targetGain
		}

		err := client.HeadAmp.SetGain(index, newGain)
		if err != nil {
			return err
		}

		if step%10 == 0 || step == totalSteps {
			log.Debugf("  Step %d/%d: %.2f dB\n", step, totalSteps, newGain)
		}

		if step < totalSteps {
			time.Sleep(stepInterval)
		}
	}

	return nil
}

// headampPhantomPowerCmd represents the headamp phantom power command
var headampPhantomPowerCmd = &cobra.Command{
	Use:   "phantom",
	Short: "Get or set headamp phantom power status",
	Long: `Get or set the phantom power status for a specified headamp index.
Examples:
  # Get phantom power status for headamp index 1
  xairctl headamp phantom 1
  # Enable phantom power for headamp index 1
  xairctl headamp phantom 1 on
  # Disable phantom power for headamp index 1
  xairctl headamp phantom 1 off`,
	Args: cobra.RangeArgs(1, 2),
	RunE: func(cmd *cobra.Command, args []string) error {
		client := ClientFromContext(cmd.Context())
		if client == nil {
			return fmt.Errorf("OSC client not found in context")
		}

		if len(args) < 1 {
			return fmt.Errorf("Please provide a headamp index")
		}

		index := mustConvToInt(args[0])

		if len(args) == 1 {
			enabled, err := client.HeadAmp.PhantomPower(index)
			if err != nil {
				return fmt.Errorf("Error getting headamp phantom power status: %w", err)
			}
			status := "disabled"
			if enabled {
				status = "enabled"
			}
			cmd.Printf("Headamp %d Phantom Power is %s\n", index, status)
			return nil
		}

		if len(args) < 2 {
			return fmt.Errorf("Please provide phantom power status: on or off")
		}

		var enable bool
		switch args[1] {
		case "on", "enable":
			enable = true
		case "off", "disable":
			enable = false
		default:
			return fmt.Errorf("Invalid phantom power status. Use 'on' or 'off'")
		}

		err := client.HeadAmp.SetPhantomPower(index, enable)
		if err != nil {
			return fmt.Errorf("Error setting headamp phantom power status: %w", err)
		}
		status := "disabled"
		if enable {
			status = "enabled"
		}

		cmd.Printf("Headamp %d Phantom Power %s successfully\n", index, status)
		return nil
	},
}

func init() {
	rootCmd.AddCommand(headampCmd)

	headampCmd.AddCommand(headampGainCmd)
	headampGainCmd.Flags().DurationP("duration", "d", 5*time.Second, "Duration over which to gradually adjust gain")

	headampCmd.AddCommand(headampPhantomPowerCmd)
}