use std::path::PathBuf;

use reqwest::Url;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct DADKTask {
    /// 包名
    pub name: String,
    /// 版本
    pub version: String,
    /// 包的描述
    pub description: String,
    /// 任务类型
    pub task_type: TaskType,
    /// 依赖的包
    pub depends: Vec<Dependency>,
    /// 构建配置
    pub build: BuildConfig,
    /// 安装配置
    pub install: InstallConfig,
}

impl DADKTask {
    pub fn new(
        name: String,
        version: String,
        description: String,
        task_type: TaskType,
        depends: Vec<Dependency>,
        build: BuildConfig,
        install: InstallConfig,
    ) -> Self {
        Self {
            name,
            version,
            description,
            task_type,
            depends,
            build,
            install,
        }
    }

    pub fn validate(&self) -> Result<(), String> {
        if self.name.is_empty() {
            return Err("name is empty".to_string());
        }
        if self.version.is_empty() {
            return Err("version is empty".to_string());
        }
        self.task_type.validate()?;
        self.build.validate()?;
        self.install.validate()?;

        return Ok(());
    }
}

/// @brief 构建配置
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BuildConfig {
    /// 构建命令
    pub build_command: String,
}

impl BuildConfig {
    pub fn new(build_command: String) -> Self {
        Self { build_command }
    }

    pub fn validate(&self) -> Result<(), String> {
        return Ok(());
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct InstallConfig {
    /// 安装到DragonOS内的目录
    pub in_dragonos_path: PathBuf,
    /// 安装命令
    pub install_command: String,
}

impl InstallConfig {
    pub fn new(in_dragonos_path: PathBuf, install_command: String) -> Self {
        Self {
            in_dragonos_path,
            install_command,
        }
    }

    pub fn validate(&self) -> Result<(), String> {
        return Ok(());
    }
}

/// @brief 依赖项
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Dependency {
    pub name: String,
    pub version: String,
}

/// # 任务类型
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum TaskType {
    /// 从源码构建
    BuildFromSource(CodeSource),
    /// 从预编译包安装
    InstallFromPrebuilt(PrebuiltSource),
}

impl TaskType {
    pub fn validate(&self) -> Result<(), String> {
        match self {
            TaskType::BuildFromSource(source) => source.validate(),
            TaskType::InstallFromPrebuilt(source) => source.validate(),
        }
    }
}

/// # 代码源
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum CodeSource {
    /// 从Git仓库获取
    Git(GitSource),
    /// 从本地目录获取
    Local(LocalSource),
    /// 从在线压缩包获取
    Archive(ArchiveSource),
}

impl CodeSource {
    pub fn validate(&self) -> Result<(), String> {
        match self {
            CodeSource::Git(source) => source.validate(),
            CodeSource::Local(source) => source.validate(Some(false)),
            CodeSource::Archive(source) => source.validate(),
        }
    }
}

/// # 预编译包源
#[derive(Debug, Clone, Serialize, Deserialize)]
pub enum PrebuiltSource {
    /// 从在线压缩包获取
    Archive(ArchiveSource),
    /// 从本地目录/文件获取
    Local(LocalSource),
}

impl PrebuiltSource {
    pub fn validate(&self) -> Result<(), String> {
        match self {
            PrebuiltSource::Archive(source) => source.validate(),
            PrebuiltSource::Local(source) => source.validate(None),
        }
    }
}

/// # Git源
///
/// 从Git仓库获取源码
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct GitSource {
    /// Git仓库地址
    url: String,
    /// 分支
    branch: String,
    /// 特定的提交的hash值（可选，如果为空，则拉取最新提交）
    revision: Option<String>,
}

impl GitSource {
    pub fn new(url: String, branch: String, revision: Option<String>) -> Self {
        Self {
            url,
            branch,
            revision,
        }
    }

    /// # 验证参数合法性
    ///
    /// 仅进行形式校验，不会检查Git仓库是否存在，以及分支是否存在、是否有权限访问等
    pub fn validate(&self) -> Result<(), String> {
        if self.url.is_empty() {
            return Err("url is empty".to_string());
        }
        if self.branch.is_empty() {
            return Err("branch is empty".to_string());
        }
        return Ok(());
    }
}

/// # 本地源
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LocalSource {
    /// 本地目录/文件的路径
    path: PathBuf,
}

impl LocalSource {
    pub fn new(path: PathBuf) -> Self {
        Self { path }
    }

    pub fn validate(&self, expect_file: Option<bool>) -> Result<(), String> {
        if !self.path.exists() {
            return Err(format!("path {:?} not exists", self.path));
        }

        if let Some(expect_file) = expect_file {
            if expect_file && !self.path.is_file() {
                return Err(format!("path {:?} is not a file", self.path));
            }

            if !expect_file && !self.path.is_dir() {
                return Err(format!("path {:?} is not a directory", self.path));
            }
        }

        return Ok(());
    }
}

/// # 在线压缩包源
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ArchiveSource {
    /// 压缩包的URL
    url: String,
}

impl ArchiveSource {
    pub fn new(url: String) -> Self {
        Self { url }
    }

    pub fn validate(&self) -> Result<(), String> {
        if self.url.is_empty() {
            return Err("url is empty".to_string());
        }

        // 判断是一个网址
        if let Ok(url) = Url::parse(&self.url) {
            if url.scheme() != "http" && url.scheme() != "https" {
                return Err(format!("url {:?} is not a http/https url", self.url));
            }
        } else {
            return Err(format!("url {:?} is not a valid url", self.url));
        }
        return Ok(());
    }
}