use anyhow::{Context, Result};
use gaol::profile::{AddressPattern, Operation, OperationSupport, PathPattern, Profile};
use log::{debug, info, warn};
use rusqlite::{params, Connection};
use serde::{Deserialize, Serialize};
use std::path::PathBuf;
use crate::sandbox::executor::{SerializedOperation, SerializedProfile};

/// Represents a sandbox profile from the database
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SandboxProfile {
    pub id: Option<i64>,
    pub name: String,
    pub description: Option<String>,
    pub is_active: bool,
    pub is_default: bool,
    pub created_at: String,
    pub updated_at: String,
}

/// Represents a sandbox rule from the database
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct SandboxRule {
    pub id: Option<i64>,
    pub profile_id: i64,
    pub operation_type: String,
    pub pattern_type: String,
    pub pattern_value: String,
    pub enabled: bool,
    pub platform_support: Option<String>,
    pub created_at: String,
}

/// Result of building a profile
pub struct ProfileBuildResult {
    pub profile: Profile,
    pub serialized: SerializedProfile,
}

/// Builder for creating gaol profiles from database configuration
pub struct ProfileBuilder {
    project_path: PathBuf,
    home_dir: PathBuf,
}

impl ProfileBuilder {
    /// Create a new profile builder
    pub fn new(project_path: PathBuf) -> Result<Self> {
        let home_dir = dirs::home_dir()
            .context("Could not determine home directory")?;
        
        Ok(Self {
            project_path,
            home_dir,
        })
    }
    
    /// Build a gaol Profile from database rules filtered by agent permissions
    pub fn build_agent_profile(&self, rules: Vec<SandboxRule>, sandbox_enabled: bool, enable_file_read: bool, enable_file_write: bool, enable_network: bool) -> Result<ProfileBuildResult> {
        // If sandbox is completely disabled, return an empty profile
        if !sandbox_enabled {
            return Ok(ProfileBuildResult {
                profile: Profile::new(vec![]).map_err(|_| anyhow::anyhow!("Failed to create empty profile"))?,
                serialized: SerializedProfile { operations: vec![] },
            });
        }
        
        let mut filtered_rules = Vec::new();
        
        for rule in rules {
            if !rule.enabled {
                continue;
            }
            
            // Filter rules based on agent permissions
            let include_rule = match rule.operation_type.as_str() {
                "file_read_all" | "file_read_metadata" => enable_file_read,
                "network_outbound" => enable_network,
                "system_info_read" => true, // Always allow system info reading
                _ => true // Include unknown rule types by default
            };
            
            if include_rule {
                filtered_rules.push(rule);
            }
        }
        
        // Always ensure project path access if file reading is enabled
        if enable_file_read {
            let has_project_access = filtered_rules.iter().any(|rule| {
                rule.operation_type == "file_read_all" && 
                rule.pattern_type == "subpath" &&
                rule.pattern_value.contains("{{PROJECT_PATH}}")
            });
            
            if !has_project_access {
                // Add a default project access rule
                filtered_rules.push(SandboxRule {
                    id: None,
                    profile_id: 0,
                    operation_type: "file_read_all".to_string(),
                    pattern_type: "subpath".to_string(),
                    pattern_value: "{{PROJECT_PATH}}".to_string(),
                    enabled: true,
                    platform_support: None,
                    created_at: String::new(),
                });
            }
        }
        
        self.build_profile_with_serialization(filtered_rules)
    }
    
    /// Build a gaol Profile from database rules
    pub fn build_profile(&self, rules: Vec<SandboxRule>) -> Result<Profile> {
        let result = self.build_profile_with_serialization(rules)?;
        Ok(result.profile)
    }
    
    /// Build a gaol Profile from database rules and return serialized operations
    pub fn build_profile_with_serialization(&self, rules: Vec<SandboxRule>) -> Result<ProfileBuildResult> {
        let mut operations = Vec::new();
        let mut serialized_operations = Vec::new();
        
        for rule in rules {
            if !rule.enabled {
                continue;
            }
            
            // Check platform support
            if !self.is_rule_supported_on_platform(&rule) {
                debug!("Skipping rule {} - not supported on current platform", rule.operation_type);
                continue;
            }
            
            match self.build_operation_with_serialization(&rule) {
                Ok(Some((op, serialized))) => {
                    // Check if operation is supported on current platform
                    if matches!(op.support(), gaol::profile::OperationSupportLevel::CanBeAllowed) {
                        operations.push(op);
                        serialized_operations.push(serialized);
                    } else {
                        warn!("Operation {:?} not supported at desired level on current platform", rule.operation_type);
                    }
                },
                Ok(None) => {
                    debug!("Skipping unsupported operation type: {}", rule.operation_type);
                },
                Err(e) => {
                    warn!("Failed to build operation for rule {}: {}", rule.id.unwrap_or(0), e);
                }
            }
        }
        
        // Ensure project path access is included
        let has_project_access = serialized_operations.iter().any(|op| {
            matches!(op, SerializedOperation::FileReadAll { path, is_subpath: true } if path == &self.project_path)
        });
        
        if !has_project_access {
            operations.push(Operation::FileReadAll(PathPattern::Subpath(self.project_path.clone())));
            serialized_operations.push(SerializedOperation::FileReadAll {
                path: self.project_path.clone(),
                is_subpath: true,
            });
        }
        
        // Create the profile
        let profile = Profile::new(operations)
            .map_err(|_| anyhow::anyhow!("Failed to create sandbox profile - some operations may not be supported on this platform"))?;
        
        Ok(ProfileBuildResult {
            profile,
            serialized: SerializedProfile {
                operations: serialized_operations,
            },
        })
    }
    
    /// Build a gaol Operation from a database rule
    fn build_operation(&self, rule: &SandboxRule) -> Result<Option<Operation>> {
        match self.build_operation_with_serialization(rule) {
            Ok(Some((op, _))) => Ok(Some(op)),
            Ok(None) => Ok(None),
            Err(e) => Err(e),
        }
    }
    
    /// Build a gaol Operation and its serialized form from a database rule
    fn build_operation_with_serialization(&self, rule: &SandboxRule) -> Result<Option<(Operation, SerializedOperation)>> {
        match rule.operation_type.as_str() {
            "file_read_all" => {
                let (pattern, path, is_subpath) = self.build_path_pattern_with_info(&rule.pattern_type, &rule.pattern_value)?;
                Ok(Some((
                    Operation::FileReadAll(pattern),
                    SerializedOperation::FileReadAll { path, is_subpath }
                )))
            },
            "file_read_metadata" => {
                let (pattern, path, is_subpath) = self.build_path_pattern_with_info(&rule.pattern_type, &rule.pattern_value)?;
                Ok(Some((
                    Operation::FileReadMetadata(pattern),
                    SerializedOperation::FileReadMetadata { path, is_subpath }
                )))
            },
            "network_outbound" => {
                let (pattern, serialized) = self.build_address_pattern_with_serialization(&rule.pattern_type, &rule.pattern_value)?;
                Ok(Some((Operation::NetworkOutbound(pattern), serialized)))
            },
            "system_info_read" => {
                Ok(Some((
                    Operation::SystemInfoRead,
                    SerializedOperation::SystemInfoRead
                )))
            },
            _ => Ok(None)
        }
    }
    
    /// Build a PathPattern from pattern type and value
    fn build_path_pattern(&self, pattern_type: &str, pattern_value: &str) -> Result<PathPattern> {
        let (pattern, _, _) = self.build_path_pattern_with_info(pattern_type, pattern_value)?;
        Ok(pattern)
    }
    
    /// Build a PathPattern and return additional info for serialization
    fn build_path_pattern_with_info(&self, pattern_type: &str, pattern_value: &str) -> Result<(PathPattern, PathBuf, bool)> {
        // Replace template variables
        let expanded_value = pattern_value
            .replace("{{PROJECT_PATH}}", &self.project_path.to_string_lossy())
            .replace("{{HOME}}", &self.home_dir.to_string_lossy());
        
        let path = PathBuf::from(expanded_value);
        
        match pattern_type {
            "literal" => Ok((PathPattern::Literal(path.clone()), path, false)),
            "subpath" => Ok((PathPattern::Subpath(path.clone()), path, true)),
            _ => Err(anyhow::anyhow!("Unknown path pattern type: {}", pattern_type))
        }
    }
    
    /// Build an AddressPattern from pattern type and value
    fn build_address_pattern(&self, pattern_type: &str, pattern_value: &str) -> Result<AddressPattern> {
        let (pattern, _) = self.build_address_pattern_with_serialization(pattern_type, pattern_value)?;
        Ok(pattern)
    }
    
    /// Build an AddressPattern and its serialized form
    fn build_address_pattern_with_serialization(&self, pattern_type: &str, pattern_value: &str) -> Result<(AddressPattern, SerializedOperation)> {
        match pattern_type {
            "all" => Ok((
                AddressPattern::All,
                SerializedOperation::NetworkOutbound { pattern: "all".to_string() }
            )),
            "tcp" => {
                let port = pattern_value.parse::<u16>()
                    .context("Invalid TCP port number")?;
                Ok((
                    AddressPattern::Tcp(port),
                    SerializedOperation::NetworkTcp { port }
                ))
            },
            "local_socket" => {
                let path = PathBuf::from(pattern_value);
                Ok((
                    AddressPattern::LocalSocket(path.clone()),
                    SerializedOperation::NetworkLocalSocket { path }
                ))
            },
            _ => Err(anyhow::anyhow!("Unknown address pattern type: {}", pattern_type))
        }
    }
    
    /// Check if a rule is supported on the current platform
    fn is_rule_supported_on_platform(&self, rule: &SandboxRule) -> bool {
        if let Some(platforms_json) = &rule.platform_support {
            if let Ok(platforms) = serde_json::from_str::<Vec<String>>(platforms_json) {
                let current_os = std::env::consts::OS;
                return platforms.contains(&current_os.to_string());
            }
        }
        // If no platform support specified, assume it's supported
        true
    }
}

/// Load a sandbox profile by ID
pub fn load_profile(conn: &Connection, profile_id: i64) -> Result<SandboxProfile> {
    conn.query_row(
        "SELECT id, name, description, is_active, is_default, created_at, updated_at 
         FROM sandbox_profiles WHERE id = ?1",
        params![profile_id],
        |row| {
            Ok(SandboxProfile {
                id: Some(row.get(0)?),
                name: row.get(1)?,
                description: row.get(2)?,
                is_active: row.get(3)?,
                is_default: row.get(4)?,
                created_at: row.get(5)?,
                updated_at: row.get(6)?,
            })
        }
    )
    .context("Failed to load sandbox profile")
}

/// Load the default sandbox profile
pub fn load_default_profile(conn: &Connection) -> Result<SandboxProfile> {
    conn.query_row(
        "SELECT id, name, description, is_active, is_default, created_at, updated_at 
         FROM sandbox_profiles WHERE is_default = 1",
        [],
        |row| {
            Ok(SandboxProfile {
                id: Some(row.get(0)?),
                name: row.get(1)?,
                description: row.get(2)?,
                is_active: row.get(3)?,
                is_default: row.get(4)?,
                created_at: row.get(5)?,
                updated_at: row.get(6)?,
            })
        }
    )
    .context("Failed to load default sandbox profile")
}

/// Load rules for a sandbox profile
pub fn load_profile_rules(conn: &Connection, profile_id: i64) -> Result<Vec<SandboxRule>> {
    let mut stmt = conn.prepare(
        "SELECT id, profile_id, operation_type, pattern_type, pattern_value, enabled, platform_support, created_at 
         FROM sandbox_rules WHERE profile_id = ?1 AND enabled = 1"
    )?;
    
    let rules = stmt.query_map(params![profile_id], |row| {
        Ok(SandboxRule {
            id: Some(row.get(0)?),
            profile_id: row.get(1)?,
            operation_type: row.get(2)?,
            pattern_type: row.get(3)?,
            pattern_value: row.get(4)?,
            enabled: row.get(5)?,
            platform_support: row.get(6)?,
            created_at: row.get(7)?,
        })
    })?
    .collect::<Result<Vec<_>, _>>()?;
    
    Ok(rules)
}

/// Get or create the gaol Profile for execution
pub fn get_gaol_profile(conn: &Connection, profile_id: Option<i64>, project_path: PathBuf) -> Result<Profile> {
    // Load the profile
    let profile = if let Some(id) = profile_id {
        load_profile(conn, id)?
    } else {
        load_default_profile(conn)?
    };
    
    info!("Using sandbox profile: {}", profile.name);
    
    // Load the rules
    let rules = load_profile_rules(conn, profile.id.unwrap())?;
    info!("Loaded {} sandbox rules", rules.len());
    
    // Build the gaol profile
    let builder = ProfileBuilder::new(project_path)?;
    builder.build_profile(rules)
}