//  This Source Code Form is subject to the terms of
//  the Mozilla Public License, v. 2.0. If a copy of the
//  MPL was not distributed with this file, You can
//  obtain one at https://mozilla.org/MPL/2.0/.

use anyhow::{anyhow, Result};
use std::path::{Path, PathBuf};

use super::{Repository, RepositoryConfig, RepositoryVersion, PublisherInfo, RepositoryInfo, PackageInfo, PackageContents};

/// Repository implementation that uses a REST API
pub struct RestBackend {
    pub uri: String,
    pub config: RepositoryConfig,
    pub local_cache_path: Option<PathBuf>,
}

impl Repository for RestBackend {
    /// Create a new repository at the specified URI
    fn create<P: AsRef<Path>>(uri: P, version: RepositoryVersion) -> Result<Self> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to create the repository
        
        let uri_str = uri.as_ref().to_string_lossy().to_string();
        
        // Create the repository configuration
        let config = RepositoryConfig {
            version,
            ..Default::default()
        };
        
        // Create the repository structure
        let repo = RestBackend {
            uri: uri_str,
            config,
            local_cache_path: None,
        };
        
        // In a real implementation, we would make a REST API call to create the repository structure
        
        Ok(repo)
    }
    
    /// Open an existing repository
    fn open<P: AsRef<Path>>(uri: P) -> Result<Self> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to get the repository configuration
        
        let uri_str = uri.as_ref().to_string_lossy().to_string();
        
        // In a real implementation, we would fetch the repository configuration from the REST API
        // For now, we'll just create a default configuration
        let config = RepositoryConfig::default();
        
        Ok(RestBackend {
            uri: uri_str,
            config,
            local_cache_path: None,
        })
    }
    
    /// Save the repository configuration
    fn save_config(&self) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to save the repository configuration
        
        // For now, just return Ok
        Ok(())
    }
    
    /// Add a publisher to the repository
    fn add_publisher(&mut self, publisher: &str) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to add the publisher
        
        if !self.config.publishers.contains(&publisher.to_string()) {
            self.config.publishers.push(publisher.to_string());
            
            // In a real implementation, we would make a REST API call to create publisher-specific resources
            
            // Save the updated configuration
            self.save_config()?;
        }
        
        Ok(())
    }
    
    /// Remove a publisher from the repository
    fn remove_publisher(&mut self, publisher: &str, dry_run: bool) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to remove the publisher
        
        if let Some(pos) = self.config.publishers.iter().position(|p| p == publisher) {
            if !dry_run {
                self.config.publishers.remove(pos);
                
                // In a real implementation, we would make a REST API call to remove publisher-specific resources
                
                // Save the updated configuration
                self.save_config()?;
            }
        }
        
        Ok(())
    }
    
    /// Get repository information
    fn get_info(&self) -> Result<RepositoryInfo> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to get repository information
        
        let mut publishers = Vec::new();
        
        for publisher_name in &self.config.publishers {
            // In a real implementation, we would get this information from the REST API
            let package_count = 0;
            let status = "online".to_string();
            let updated = "2025-07-21T18:46:00.000000Z".to_string();
            
            // Create a PublisherInfo struct and add it to the list
            publishers.push(PublisherInfo {
                name: publisher_name.clone(),
                package_count,
                status,
                updated,
            });
        }
        
        // Create and return a RepositoryInfo struct
        Ok(RepositoryInfo { publishers })
    }
    
    /// Set a repository property
    fn set_property(&mut self, property: &str, value: &str) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to set the property
        
        self.config.properties.insert(property.to_string(), value.to_string());
        self.save_config()?;
        
        Ok(())
    }
    
    /// Set a publisher property
    fn set_publisher_property(&mut self, publisher: &str, property: &str, value: &str) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to set the publisher property
        
        // Check if the publisher exists
        if !self.config.publishers.contains(&publisher.to_string()) {
            return Err(anyhow!("Publisher does not exist: {}", publisher));
        }
        
        // Create the property key in the format "publisher/property"
        let key = format!("{}/{}", publisher, property);
        
        // Set the property
        self.config.properties.insert(key, value.to_string());
        
        // Save the updated configuration
        self.save_config()?;
        
        Ok(())
    }
    
    /// List packages in the repository
    fn list_packages(&self, publisher: Option<&str>, pattern: Option<&str>) -> Result<Vec<PackageInfo>> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to list packages
        
        let mut packages = Vec::new();
        
        // Filter publishers if specified
        let publishers = if let Some(pub_name) = publisher {
            if !self.config.publishers.contains(&pub_name.to_string()) {
                return Err(anyhow!("Publisher does not exist: {}", pub_name));
            }
            vec![pub_name.to_string()]
        } else {
            self.config.publishers.clone()
        };
        
        // For each publisher, list packages
        for pub_name in publishers {
            // In a real implementation, we would make a REST API call to get package information
            // The API call would return a list of packages with their names, versions, and other metadata
            // We would then parse this information and create PackageInfo structs
            
            // For now, we return an empty list since we don't want to return placeholder data
            // and we don't have a real API to call
            
            // If pattern filtering is needed, it would be applied here to the results from the API
            // When implementing, use the regex crate to handle user-provided regexp patterns properly,
            // similar to the implementation in file_backend.rs
        }
        
        Ok(packages)
    }
    
    /// Show contents of packages
    fn show_contents(&self, publisher: Option<&str>, pattern: Option<&str>, action_types: Option<&[String]>) -> Result<Vec<PackageContents>> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to get package contents
        
        // Get the list of packages
        let packages = self.list_packages(publisher, pattern)?;
        
        // For each package, create a PackageContents struct
        let mut package_contents = Vec::new();
        
        for pkg_info in packages {
            // In a real implementation, we would get this information from the REST API
            
            // Format the package identifier using the FMRI
            let pkg_id = if let Some(version) = &pkg_info.fmri.version {
                format!("{}@{}", pkg_info.fmri.name, version)
            } else {
                pkg_info.fmri.name.clone()
            };
            
            // Example content for each type
            // In a real implementation, we would get this information from the REST API
            
            // Files
            let files = if action_types.is_none() || action_types.as_ref().unwrap().contains(&"file".to_string()) {
                Some(vec![
                    "/usr/bin/example".to_string(),
                    "/usr/lib/example.so".to_string(),
                ])
            } else {
                None
            };
            
            // Directories
            let directories = if action_types.is_none() || action_types.as_ref().unwrap().contains(&"dir".to_string()) {
                Some(vec![
                    "/usr/share/doc/example".to_string(),
                    "/usr/share/man/man1".to_string(),
                ])
            } else {
                None
            };
            
            // Links
            let links = if action_types.is_none() || action_types.as_ref().unwrap().contains(&"link".to_string()) {
                Some(vec![
                    "/usr/bin/example-link".to_string(),
                ])
            } else {
                None
            };
            
            // Dependencies
            let dependencies = if action_types.is_none() || action_types.as_ref().unwrap().contains(&"depend".to_string()) {
                Some(vec![
                    "pkg:/system/library@0.5.11".to_string(),
                ])
            } else {
                None
            };
            
            // Licenses
            let licenses = if action_types.is_none() || action_types.as_ref().unwrap().contains(&"license".to_string()) {
                Some(vec![
                    "/usr/share/licenses/example/LICENSE".to_string(),
                ])
            } else {
                None
            };
            
            // Add the package contents to the result
            package_contents.push(PackageContents {
                package_id: pkg_id,
                files,
                directories,
                links,
                dependencies,
                licenses,
            });
        }
        
        Ok(package_contents)
    }
    
    /// Rebuild repository metadata
    fn rebuild(&self, publisher: Option<&str>, no_catalog: bool, no_index: bool) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to rebuild metadata
        
        // Filter publishers if specified
        let publishers = if let Some(pub_name) = publisher {
            if !self.config.publishers.contains(&pub_name.to_string()) {
                return Err(anyhow!("Publisher does not exist: {}", pub_name));
            }
            vec![pub_name.to_string()]
        } else {
            self.config.publishers.clone()
        };
        
        // For each publisher, rebuild metadata
        for pub_name in publishers {
            println!("Rebuilding metadata for publisher: {}", pub_name);
            
            if !no_catalog {
                println!("Rebuilding catalog...");
                // In a real implementation, we would make a REST API call to rebuild the catalog
            }
            
            if !no_index {
                println!("Rebuilding search index...");
                // In a real implementation, we would make a REST API call to rebuild the search index
            }
        }
        
        Ok(())
    }
    
    /// Refresh repository metadata
    fn refresh(&self, publisher: Option<&str>, no_catalog: bool, no_index: bool) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to refresh metadata
        
        // Filter publishers if specified
        let publishers = if let Some(pub_name) = publisher {
            if !self.config.publishers.contains(&pub_name.to_string()) {
                return Err(anyhow!("Publisher does not exist: {}", pub_name));
            }
            vec![pub_name.to_string()]
        } else {
            self.config.publishers.clone()
        };
        
        // For each publisher, refresh metadata
        for pub_name in publishers {
            println!("Refreshing metadata for publisher: {}", pub_name);
            
            if !no_catalog {
                println!("Refreshing catalog...");
                // In a real implementation, we would make a REST API call to refresh the catalog
            }
            
            if !no_index {
                println!("Refreshing search index...");
                // In a real implementation, we would make a REST API call to refresh the search index
            }
        }
        
        Ok(())
    }
    
    /// Set the default publisher for the repository
    fn set_default_publisher(&mut self, publisher: &str) -> Result<()> {
        // This is a stub implementation
        // In a real implementation, we would make a REST API call to set the default publisher
        
        // Check if the publisher exists
        if !self.config.publishers.contains(&publisher.to_string()) {
            return Err(anyhow!("Publisher does not exist: {}", publisher));
        }
        
        // Set the default publisher
        self.config.default_publisher = Some(publisher.to_string());
        
        // Save the updated configuration
        self.save_config()?;
        
        Ok(())
    }
}

impl RestBackend {
    /// Set the local cache path
    pub fn set_local_cache_path<P: AsRef<Path>>(&mut self, path: P) -> Result<()> {
        self.local_cache_path = Some(path.as_ref().to_path_buf());
        Ok(())
    }
}