// 澶栧３璁剧疆鎸佷箙鍖?(W-CFG-01~03): %APPDATA%\com.iboard.app\shell-config.json
// - 涓庡墠绔处鍙?鏈嶅姟绔棤鍏? 绂荤嚎鍙敤;
// - 瀛楁缂哄け/鎹熷潖鏃跺洖閫€榛樿鍊?(serde(default) + 瀹芥澗鍔犺浇);
// - 鍐欏叆閲囩敤 涓存椂鏂囦欢 + 鏇挎崲 鐨勫師瀛愯涔夈€?
use serde::{Deserialize, Serialize};
use std::path::Path;

pub const FILE_NAME: &str = "shell-config.json";

/// 璁捐鍩哄噯灏哄 (绉诲姩绔竷灞€鍙ｅ緞): 绐楀彛姣斾緥閿佹涓?405:720
pub const DESIGN_WIDTH: f64 = 405.0;
pub const DESIGN_HEIGHT: f64 = 720.0;
/// 窗口宽度可配置范围 (逻辑像素); 高度由比例推导, 不接受单独配置
pub const WIDTH_MIN: f64 = 242.0;
pub const WIDTH_MAX: f64 = 620.0;

/// 鎸夐攣瀹氭瘮渚嬬敱瀹藉害鎺ㄥ楂樺害 (鍞竴灏哄鍏ュ彛)
pub fn height_for_width(width: f64) -> f64 {
    let w = width.clamp(WIDTH_MIN, WIDTH_MAX);
    (w * DESIGN_HEIGHT / DESIGN_WIDTH).round()
}

/// 鍚搁檮杈?(W-SNP-01: 鍥涜竟)
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
#[serde(rename_all = "lowercase")]
pub enum Edge {
    #[default]
    Left,
    Right,
    Top,
    Bottom,
}

impl Edge {
    pub fn css(&self) -> &'static str {
        match self {
            Edge::Left => "left",
            Edge::Right => "right",
            Edge::Top => "top",
            Edge::Bottom => "bottom",
        }
    }
}

/// 涓荤獥鍙ｈ蹇?(W-WIN-07): 灏哄涓洪€昏緫鍍忕礌 (DPI 绋冲畾), 浣嶇疆涓虹墿鐞嗗儚绱?(鍔犺浇鏃舵牎楠屽す鍙?
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(default)]
pub struct WindowCfg {
    pub width: f64,
    pub height: f64,
    pub x: Option<i32>,
    pub y: Option<i32>,
}

impl Default for WindowCfg {
    fn default() -> Self {
        // 323x574 = 405:720 姣斾緥 (0.797x of 405x720, 2026-10-26 鏀惧ぇ 12%)
        Self { width: 323.0, height: height_for_width(323.0), x: None, y: None }
    }
}

/// 鎮诞鐞冨仠闈?(W-SNP-02/12): 杈?+ 娌胯竟浣嶇疆 (鎮诞鐞冧腑蹇? 鐗╃悊鍍忕礌)
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(default)]
pub struct DockCfg {
    pub edge: Edge,
    pub offset: i32,
}

impl Default for DockCfg {
    fn default() -> Self {
        Self { edge: Edge::Left, offset: 360 }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(default)]
pub struct ShellConfig {
    /// 鍚搁檮鎬诲紑鍏?(W-SNP-09, 榛樿寮€鍚?
    pub snap_enabled: bool,
    pub window: WindowCfg,
    pub dock: DockCfg,
    /// 绐楀彛瀹藉害 (閫昏緫鍍忕礌) 鈥斺€?**鍞竴灏哄閰嶇疆椤?*銆?    /// 楂樺害鎸?405:720 閿佸畾姣斾緥鑷姩鎺ㄥ, 鏃犻渶涔熸棤娉曞崟鐙厤缃?
    /// 鐣欑┖鏃跺洖钀藉埌 window.width銆?    #[serde(default)]
    pub window_width: Option<f64>,
    /// 閰嶇疆缁撴瀯鐗堟湰: 0 = 鏃х増 (绐楀彛灏哄鎸?405x720 鍙ｅ緞淇濆瓨),
    /// 1 = 鏁翠綋缂╁皬 30% (288 鍙ｅ緞), 2 = 鏀惧ぇ 12% (323 鍙ｅ緞) + 鍗曞€煎搴﹂厤缃€?    /// load 鏃跺仛涓€娆℃€ц縼绉汇€?    /// 娉ㄦ剰蹇呴』鐢ㄥ瓧娈电骇 serde(default) (u8 鈫?0): 瀹瑰櫒绾?default 浼氬彇
    /// ShellConfig::default() 鐨?2, 鏃ч厤缃枃浠跺氨姘歌繙涓嶈縼绉讳簡銆?    #[serde(default)]
    pub cfg_version: u8,
}

impl Default for ShellConfig {
    fn default() -> Self {
        Self {
            snap_enabled: true,
            window: WindowCfg::default(),
            dock: DockCfg::default(),
            window_width: Some(WindowCfg::default().width),
            cfg_version: 2,
        }
    }
}

/// 杩佺Щ鍓嶇殑绐楀彛瀹藉害 (鏃у彛寰?, 渚?load 浣跨敤
impl WindowCfg {
    /// 搴旂敤閿佸畾姣斾緥: 瀹藉害澶瑰彇鍒板悎娉曡寖鍥? 楂樺害鐢卞搴︽帹瀵?(蹇界暐瀛樼洏楂樺害)
    pub(crate) fn normalize(&mut self) {
        self.width = self.width.clamp(WIDTH_MIN, WIDTH_MAX);
        self.height = height_for_width(self.width);
    }
}

impl ShellConfig {
    pub fn load(dir: &Path) -> ShellConfig {
        let path = dir.join(FILE_NAME);
        let mut cfg = match std::fs::read_to_string(&path) {
            Ok(text) => match serde_json::from_str::<ShellConfig>(&text) {
                Ok(cfg) => cfg,
                Err(_) => ShellConfig::default(), // 鍐欏潖 JSON 鈫?榛樿鍊?(W-CFG-03)
            },
            Err(_) => ShellConfig::default(),
        };
        // 一次性迁移
        if cfg.cfg_version < 1 {
            // v0 (405 鍙ｅ緞) 鈫?v1: 鏁翠綋缂╁皬 30%
            cfg.window.width = (cfg.window.width * 0.7).max(216.0);
            cfg.window.height = (cfg.window.height * 0.7).max(384.0);
            cfg.cfg_version = 1;
        }
        if cfg.cfg_version < 2 {
            // v1 (288 口径) -> v2: 放大 12% (323 口径), 引入单值宽度配置
            cfg.window.width = (cfg.window.width * 1.12).max(WIDTH_MIN);
            cfg.window.height = height_for_width(cfg.window.width);
            cfg.cfg_version = 2;
        }
        // 鍗曞€煎搴︿紭鍏? 楂樺害涓€寰嬫寜閿佸畾姣斾緥鎺ㄥ (蹇界暐瀛樼洏楂樺害)
        if let Some(w) = cfg.window_width {
            cfg.window.width = w;
        }
        cfg.window.normalize();
        cfg.window_width = Some(cfg.window.width);
        cfg.save(dir);
        cfg
    }

    pub fn save(&self, dir: &Path) {
        let path = dir.join(FILE_NAME);
        let tmp = dir.join(format!("{FILE_NAME}.tmp"));
        let text = match serde_json::to_string_pretty(self) {
            Ok(t) => t,
            Err(_) => return,
        };
        if std::fs::write(&tmp, text).is_ok() {
            // Windows 上 rename 不能覆盖已存在文件, 先移除
            let _ = std::fs::remove_file(&path);
            let _ = std::fs::rename(&tmp, &path);
        }
        // 鍐欏け璐ヤ繚鎸侀潤榛?(W-CFG-04): 杩愯涓殑澶栧３涓嶅彈褰卞搷
    }
}