package com.opendance.studio.data

import android.content.Context
import androidx.core.content.edit

/**
 * 应用设置（SharedPreferences）。
 *
 * 契约 websocket-keypoints.md §3.3 的 config 字段与这里的前四项一一对应。
 */
class AppSettings(context: Context) {

    private val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)

    /** Windows 客户端主机地址 */
    var host: String
        get() = prefs.getString(KEY_HOST, DEFAULT_HOST) ?: DEFAULT_HOST
        set(value) = prefs.edit { putString(KEY_HOST, value.trim()) }

    var port: Int
        get() = prefs.getInt(KEY_PORT, DEFAULT_PORT)
        set(value) = prefs.edit { putInt(KEY_PORT, value.coerceIn(1, 65535)) }

    /** 目标帧率（契约 config.targetFps） */
    var targetFps: Int
        get() = prefs.getInt(KEY_TARGET_FPS, DEFAULT_FPS)
        set(value) = prefs.edit { putInt(KEY_TARGET_FPS, value.coerceIn(5, 60)) }

    /** 是否镜像画面（契约 flags.bit0 / config.mirror） */
    var mirror: Boolean
        get() = prefs.getBoolean(KEY_MIRROR, true)
        set(value) = prefs.edit { putBoolean(KEY_MIRROR, value) }

    /** 仅上半身模式（契约 flags.bit2） */
    var upperBodyOnly: Boolean
        get() = prefs.getBoolean(KEY_UPPER_BODY, false)
        set(value) = prefs.edit { putBoolean(KEY_UPPER_BODY, value) }

    /** 分辨率档位，取值见 [Resolutions] */
    var resolution: String
        get() = prefs.getString(KEY_RESOLUTION, Resolutions.MEDIUM) ?: Resolutions.MEDIUM
        set(value) = prefs.edit { putString(KEY_RESOLUTION, value) }

    /** 上次连接的设备名（hello 上报用） */
    var deviceLabel: String
        get() = prefs.getString(KEY_DEVICE_LABEL, "") ?: ""
        set(value) = prefs.edit { putString(KEY_DEVICE_LABEL, value) }

    /** 自动重连 */
    var autoReconnect: Boolean
        get() = prefs.getBoolean(KEY_AUTO_RECONNECT, true)
        set(value) = prefs.edit { putBoolean(KEY_AUTO_RECONNECT, value) }

    fun webSocketUrl(): String = "ws://$host:$port/pose"

    companion object {
        const val PREFS_NAME = "opendance_settings"
        const val DEFAULT_HOST = "192.0.2.100"
        const val DEFAULT_PORT = 8765
        const val DEFAULT_FPS = 30

        private const val KEY_HOST = "host"
        private const val KEY_PORT = "port"
        private const val KEY_TARGET_FPS = "target_fps"
        private const val KEY_MIRROR = "mirror"
        private const val KEY_UPPER_BODY = "upper_body_only"
        private const val KEY_RESOLUTION = "resolution"
        private const val KEY_DEVICE_LABEL = "device_label"
        private const val KEY_AUTO_RECONNECT = "auto_reconnect"
    }
}

/** 分辨率档位 —— 与契约 config.resolution 的取值格式一致 */
object Resolutions {
    const val LOW = "480x360"
    const val MEDIUM = "640x480"
    const val HIGH = "1280x720"

    val ALL = listOf(LOW, MEDIUM, HIGH)

    /** 返回 (宽, 高) */
    fun parse(value: String): Pair<Int, Int> {
        val parts = value.split("x")
        val w = parts.getOrNull(0)?.toIntOrNull() ?: 640
        val h = parts.getOrNull(1)?.toIntOrNull() ?: 480
        return w to h
    }

    fun label(value: String): String = when (value) {
        LOW -> "低（480×360，最省电）"
        HIGH -> "高（1280×720，最清晰）"
        else -> "中（640×480，推荐）"
    }
}