use super::types::DockerManager;
use crate::DuckError;
use crate::container::path_utils::{PathProcessor, PathUtilsError};
use anyhow::Result;
use docker_compose_types as dct;
use std::path::Path;
use tracing::{debug, info, warn};

/// 挂载信息结构体
#[derive(Debug, Clone)]
pub struct MountInfo {
    pub service_name: String,
    pub container_path: String,
    pub host_path: Option<String>,
    pub is_bind_mount: bool,
}

impl DockerManager {
    /// 确保所有宿主机挂载目录存在
    pub async fn ensure_host_volumes_exist(&self) -> Result<()> {
        info!("🔍 Checking and creating host mount directories...");

        let compose_config = self.load_compose_config()?;
        let mount_directories = self.extract_mount_directories(&compose_config)?;

        if mount_directories.is_empty() {
            info!("✅ No host mount directories need to be created");
            return Ok(());
        }

        info!("📁 Found {} mount directories to verify", mount_directories.len());

        for mount_info in mount_directories {
            if let Some(host_path) = &mount_info.host_path {
                if mount_info.is_bind_mount {
                    self.create_host_directory_if_not_exists(host_path)?;
                }
            }
        }

        info!("✅ Host mount directory verification completed");
        Ok(())
    }

    /// 从compose配置中提取挂载目录信息
    pub fn extract_mount_directories(&self, compose: &dct::Compose) -> Result<Vec<MountInfo>> {
        let mut mount_infos = Vec::new();

        for (service_name, service_opt) in &compose.services.0 {
            if let Some(service) = service_opt {
                let volumes = &service.volumes;
                for volume in volumes {
                    if let Some(mount_info) = self.parse_volume_spec(service_name, volume) {
                        mount_infos.push(mount_info);
                    }
                }
            }
        }

        Ok(mount_infos)
    }

    /// 解析单个volume规范
    fn parse_volume_spec(&self, service_name: &str, volume: &dct::Volumes) -> Option<MountInfo> {
        match volume {
            dct::Volumes::Simple(volume_str) => {
                let parts: Vec<&str> = volume_str.split(':').collect();

                match parts.len() {
                    2 | 3 => {
                        // 格式: host_path:container_path 或 host_path:container_path:mode
                        let host_path = parts[0];
                        let container_path = parts[1];

                        let is_bind = self.is_bind_mount_path(host_path);

                        if is_bind {
                            // 规范化路径（返回 Result）
                            let normalized_host_path = match self.normalize_path(host_path) {
                                Ok(path) => path,
                                Err(e) => {
                                    warn!("Path normalization failed: {}", e);
                                    return None;
                                }
                            };

                            // 将相对路径转换为相对于compose文件所在目录的绝对路径
                            let host_path_buf = std::path::PathBuf::from(&normalized_host_path);
                            let absolute_host_path = if host_path_buf.is_absolute() {
                                normalized_host_path
                            } else {
                                match self.get_working_directory() {
                                    Some(compose_dir) => compose_dir
                                        .join(&normalized_host_path)
                                        .to_string_lossy()
                                        .to_string(),
                                    None => {
                                        return None;
                                    }
                                }
                            };
                            Some(MountInfo {
                                service_name: service_name.to_string(),
                                container_path: container_path.to_string(),
                                host_path: Some(absolute_host_path),
                                is_bind_mount: true,
                            })
                        } else {
                            None
                        }
                    }
                    _ => None,
                }
            }
            dct::Volumes::Advanced(volume_def) => {
                // 处理高级volume定义
                if let Some(source) = &volume_def.source {
                    let is_bind = self.is_bind_mount_path(source);

                    if is_bind {
                        let container_path = &volume_def.target;
                        // 规范化路径（返回 Result）
                        let normalized_source = match self.normalize_path(source) {
                            Ok(path) => path,
                            Err(e) => {
                                warn!("Path normalization failed: {}", e);
                                return None;
                            }
                        };

                        // 将相对路径转换为相对于compose文件所在目录的绝对路径
                        let source_path_buf = std::path::PathBuf::from(&normalized_source);
                        let absolute_host_path = if source_path_buf.is_absolute() {
                            normalized_source
                        } else {
                            match self.get_working_directory() {
                                Some(compose_dir) => compose_dir
                                    .join(&normalized_source)
                                    .to_string_lossy()
                                    .to_string(),
                                None => {
                                    return None;
                                }
                            }
                        };
                        return Some(MountInfo {
                            service_name: service_name.to_string(),
                            container_path: container_path.to_string(),
                            host_path: Some(absolute_host_path),
                            is_bind_mount: true,
                        });
                    }
                }
                None
            }
        }
    }

    /// 规范化路径（使用新的路径处理器）
    fn normalize_path(&self, path: &str) -> Result<String, PathUtilsError> {
        let path_processor = PathProcessor::new(
            self.runtime_env.host_os.clone(),
            self.runtime_env.path_format.clone(),
        );
        path_processor.normalize_path(path)
    }

    /// 判断是否为bind mount路径（使用新的路径处理器）
    fn is_bind_mount_path(&self, path: &str) -> bool {
        let path_processor = PathProcessor::new(
            self.runtime_env.host_os.clone(),
            self.runtime_env.path_format.clone(),
        );
        path_processor.is_bind_mount_path(path)
    }

    /// 创建宿主机目录（如果不存在）
    fn create_host_directory_if_not_exists(&self, path_str: &str) -> Result<()> {
        let path = Path::new(path_str);

        if path.exists() {
            if path.is_dir() {
                debug!("✅ Directory already exists: {}", path.display());
                return Ok(());
            } else {
                debug!("✅ File already exists: {}", path.display());
                return Ok(());
            }
        }

        // 检查路径是否有扩展名，可能是文件路径
        let is_likely_file = path.extension().is_some();

        let dir_to_create = if is_likely_file {
            // 如果是文件路径，创建父目录
            path.parent()
        } else {
            // 如果是目录路径，创建该目录
            Some(path)
        };

        if let Some(dir_path) = dir_to_create {
            match std::fs::create_dir_all(dir_path) {
                Ok(_) => {
                    info!("📂 Creating directory: {}", dir_path.display());
                    Ok(())
                }
                Err(e) => {
                    let error_msg = format!("Failed to create directory {}: {}", dir_path.display(), e);
                    warn!("❌ {}", error_msg);
                    Err(DuckError::Docker(error_msg).into())
                }
            }
        } else {
            Ok(())
        }
    }
}
