package solutions.tretter.mindmachine.session

import solutions.tretter.mindmachine.domain.SessionConfig
import solutions.tretter.mindmachine.domain.SessionMode
import solutions.tretter.mindmachine.domain.SessionPreset
import kotlin.math.roundToInt

/**
 * Lightweight model for the current (non-timeline) setup sliders.
 *
 * Note: Dana's spec introduces a full timeline editor; this model is just to keep
 * the existing SetupScreen compiling while we wire the dedicated editor screen.
 */

data class TimelineModel(
    val preset: SessionPreset,
    val durationSeconds: Int,
    val parameters: List<Parameter>
) {

    data class Parameter(
        val id: String,
        val name: String,
        val description: String,
        val min: Float,
        val max: Float,
        val defaultValue: Float,
        val value: Float,
        val units: String = ""
    )

    companion object {
        fun createForPreset(preset: SessionPreset, durationSeconds: Int): TimelineModel {
            val flashSec = preset.flashIntervalMs.toFloat() / 1000f
            val params = listOf(
                Parameter(
                    id = "flash_interval",
                    name = "Flash Interval",
                    description = "Time between flashes in the visual pattern",
                    min = 0.05f,
                    max = 2.0f,
                    defaultValue = flashSec,
                    value = flashSec,
                    units = "s"
                ),
                Parameter(
                    id = "carrier_frequency",
                    name = "Carrier Frequency",
                    description = "Base audio frequency for binaural beats",
                    min = 80f,
                    max = 400f,
                    defaultValue = preset.carrierFrequencyHz,
                    value = preset.carrierFrequencyHz,
                    units = "Hz"
                ),
                Parameter(
                    id = "binaural_difference",
                    name = "Binaural Difference",
                    description = "Frequency difference between left/right audio channels",
                    min = 0.5f,
                    max = 20f,
                    defaultValue = preset.binauralDifferenceHz,
                    value = preset.binauralDifferenceHz,
                    units = "Hz"
                )
            )
            return TimelineModel(preset = preset, durationSeconds = durationSeconds, parameters = params)
        }
    }

    fun updateParameterValue(id: String, newValue: Float): TimelineModel {
        return copy(parameters = parameters.map { if (it.id == id) it.copy(value = newValue) else it })
    }

    fun toSessionConfig(mode: SessionMode): SessionConfig {
        val flashIntervalMs = ((parameters.firstOrNull { it.id == "flash_interval" }?.value
            ?: (preset.flashIntervalMs.toFloat() / 1000f)) * 1000f).roundToInt()
        val carrier = parameters.firstOrNull { it.id == "carrier_frequency" }?.value ?: preset.carrierFrequencyHz
        val diff = parameters.firstOrNull { it.id == "binaural_difference" }?.value ?: preset.binauralDifferenceHz

        return SessionConfig(
            presetId = preset.id,
            durationSec = durationSeconds,
            mode = mode,
            visualPatternType = preset.visualPatternType,
            flashIntervalMs = flashIntervalMs,
            intensityPercent = preset.intensityPercent,
            carrierFrequencyHz = carrier,
            binauralDifferenceHz = diff
        )
    }
}