use std::collections::HashMap;
use crate::{
    storage::Secret,
    sync::{ConflictInfo, SyncMetadata},
    error::Result,
};



pub async fn detect_conflicts(
    local_secrets: &HashMap<String, Secret>,
    remote_metadata: &SyncMetadata,
) -> Result<Vec<ConflictInfo>> {
    let mut conflicts = Vec::new();
    
    // Simple conflict detection based on version comparison
    for (key, secret) in local_secrets {
        if secret.metadata.version != remote_metadata.sync_version {
            let parts: Vec<&str> = key.split(':').collect();
            if parts.len() >= 4 {
                conflicts.push(ConflictInfo {
                    secret_key: parts[3].to_string(),
                    namespace: parts[2].to_string(),
                    local_version: secret.metadata.version,
                    remote_version: remote_metadata.sync_version,
                    conflict_type: "ModifiedBoth".to_string(),
                });
            }
        }
    }
    
    Ok(conflicts)
}

#[derive(Debug)]
pub enum ConflictResolution {
    UseLocal,
    UseRemote,
    Merge,
    Skip,
}

pub struct ConflictResolver;

impl ConflictResolver {
    pub fn resolve_conflict(
        local_secret: &Secret,
        remote_secret: &Secret,
        strategy: ConflictResolution,
    ) -> Result<Secret> {
        match strategy {
            ConflictResolution::UseLocal => Ok(local_secret.clone()),
            ConflictResolution::UseRemote => Ok(remote_secret.clone()),
            ConflictResolution::Merge => {
                // Simple merge: use newer timestamp
                if local_secret.metadata.updated_at > remote_secret.metadata.updated_at {
                    Ok(local_secret.clone())
                } else {
                    Ok(remote_secret.clone())
                }
            }
            ConflictResolution::Skip => Ok(local_secret.clone()),
        }
    }

    pub fn auto_resolve_conflicts(
        conflicts: &[ConflictInfo],
        strategy: AutoResolveStrategy,
    ) -> Result<Vec<(ConflictInfo, ConflictResolution)>> {
        let mut resolutions = Vec::new();
        
        for conflict in conflicts {
            let resolution = match strategy {
                AutoResolveStrategy::PreferLocal => ConflictResolution::UseLocal,
                AutoResolveStrategy::PreferRemote => ConflictResolution::UseRemote,
                AutoResolveStrategy::PreferNewer => ConflictResolution::Merge,
                AutoResolveStrategy::Manual => ConflictResolution::Skip,
            };
            resolutions.push((conflict.clone(), resolution));
        }
        
        Ok(resolutions)
    }
}

#[derive(Debug)]
pub enum AutoResolveStrategy {
    PreferLocal,
    PreferRemote,
    PreferNewer,
    Manual,
}