use std::{

    collections::HashMap,

    path::{Path, PathBuf},

    sync::Arc,

};

#[cfg(feature = "async-std")]

use async_fs as fs;

#[cfg(feature = "async-std")]

use async_lock::{Mutex, RwLock};

#[cfg(feature = "async-std")]

use futures_lite::AsyncReadExt;

#[cfg(feature = "tokio")]

use tokio::{

    fs,

    io::AsyncReadExt,

    sync::{Mutex, RwLock},

};

use crate::{

    AsAttributes, Key, Secret,

    file::{Error, InvalidItemError, LockedItem, LockedKeyring, UnlockedItem, api},

};

/// Definition for batch item creation: (label, attributes, secret, replace)

pub type ItemDefinition = (String, HashMap<String, String>, Secret, bool);

/// File backed keyring.

#[derive(Debug)]

pub struct UnlockedKeyring {

    pub(super) keyring: Arc<RwLock<api::Keyring>>,

    pub(super) path: Option<PathBuf>,

    /// Times are stored before reading the file to detect

    /// file changes before writing

    pub(super) mtime: Mutex<Option<std::time::SystemTime>>,

    pub(super) key: Mutex<Option<Arc<Key>>>,

    pub(super) secret: Mutex<Option<Arc<Secret>>>,

}

impl UnlockedKeyring {

    /// Load from a keyring file.

    ///

    /// # Arguments

    ///

    /// * `path` - The path to the file backend.

    /// * `secret` - The service key, usually retrieved from the Secrets portal.

    ///   Pass `None` for unencrypted keyrings.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret), fields(path = ?path.as_ref())))]

    }

    /// Load and unlock a keyring with an already-derived key.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(key), fields(path = ?path.as_ref())))]

    }

    /// Load from a keyring file without validating the secret.

    ///

    /// # Arguments

    ///

    /// * `path` - The path to the file backend.

    /// * `secret` - The service key, usually retrieved from the Secrets portal.

    ///

    /// # Safety

    ///

    /// This method skips validation and doesn't verify that the secret can

    /// decrypt all items in the keyring. Use only for recovery scenarios where

    /// you need to access a partially corrupted keyring. The keyring may

    /// contain items that cannot be decrypted with the provided secret, and

    /// writing new items may use a different secret than existing items.

    #[allow(unsafe_code)]

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret), fields(path = ?path.as_ref())))]

        path: impl AsRef<Path>,

        secret: Secret,

    ) -> Result<Self, Error> {

    }

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret), fields(path = ?path.as_ref(), validate_items = validate_items)))]

        path: impl AsRef<Path>,

        secret: Option<Secret>,

        validate_items: bool,

    ) -> Result<Self, Error> {

        #[cfg(feature = "tracing")]

        tracing::debug!("Trying to load keyring file at {:?}", path.as_ref());

                unsafe {

                }

            }

        }

    }

    /// Creates a temporary backend, that is never stored on disk.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret)))]

        })

    }

    /// Creates a temporary unencrypted backend, that is never stored on disk.

        })

    }

    /// Load a v0 (legacy gnome-keyring) file and migrate it to v1 format.

    ///

    /// The migrated keyring will be written to `target_path` when

    /// [`write()`](Self::write) is called.

    ///

    /// # Arguments

    ///

    /// * `source` - Path to the legacy v0 keyring file.

    /// * `target_path` - Where the v1 keyring should be stored.

    /// * `secret` - The encryption secret, or `None` for unencrypted keyrings.

    pub async fn load_from_v0(

        source: impl AsRef<Path>,

        target_path: impl Into<PathBuf>,

        secret: Option<Secret>,

    ) -> Result<Self, Error> {

    }

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(file, secret), fields(path = ?path.as_ref())))]

        file: &mut fs::File,

        path: impl AsRef<Path>,

        secret: Option<Secret>,

    ) -> Result<Self, Error> {

            }),

            // Plain legacy keyrings don't have the binary file header

            {

            }

        }

    }

        content: &[u8],

        path: impl AsRef<Path>,

        secret: Option<Secret>,

    ) -> Result<Self, Error> {

        #[cfg(feature = "tracing")]

        tracing::debug!("Migrating from legacy keyring format");

        #[cfg(feature = "tracing")]

        let _migrate_span =

            tracing::debug_span!("migrate_items", item_count = decrypted_items.len());

        }

        })

    }

    /// Helper for opening/creating keyrings with explicit paths.

    ///

    /// Handles v0 -> v1 migration automatically.

        v1_path: PathBuf,

        v0_path: PathBuf,

        secret: Option<Secret>,

    ) -> Result<Self, Error> {

            #[cfg(feature = "tracing")]

            tracing::debug!("Loading v1 keyring file");

        }

            #[cfg(feature = "tracing")]

            tracing::debug!("Trying to load keyring file at {:?}", v0_path);

            }

        } else {

            #[cfg(feature = "tracing")]

            tracing::debug!("Creating new keyring");

            })

        }

    }

    /// Open a keyring with given name from the default directory.

    ///

    /// This function will automatically migrate the keyring to the

    /// latest format.

    ///

    /// # Arguments

    ///

    /// * `name` - The name of the keyring.

    /// * `secret` - The service key, usually retrieved from the Secrets portal.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret)))]

    }

    /// Open a named current-format keyring with an already-derived key.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(key)))]

    }

    /// Open or create a keyring at a specific data directory.

    ///

    /// This is useful for tests and cases where you want explicit control over

    /// where keyrings are stored, avoiding the default XDG_DATA_HOME location.

    ///

    /// This function will automatically migrate the keyring to the latest

    /// format.

    ///

    /// # Arguments

    ///

    /// * `data_dir` - Base data directory (keyrings stored in

    ///   `data_dir/keyrings/v1/`)

    /// * `name` - The name of the keyring.

    /// * `secret` - The service key, usually retrieved from the Secrets portal.

    ///

    /// # Example

    ///

    /// ```no_run

    /// # use oo7::{Secret, file::UnlockedKeyring};

    /// # async fn example() -> Result<(), Box<dyn std::error::Error>> {

    /// let temp_dir = tempfile::tempdir()?;

    /// let keyring = UnlockedKeyring::open_at(

    ///     temp_dir.path(),

    ///     "test-keyring",

    ///     Some(Secret::from("password")),

    /// )

    /// .await?;

    /// keyring

    ///     .create_item("item", &[("attr", "value")], Secret::text("secret"), false)

    ///     .await?;

    /// keyring.write().await?; // Writes to temp_dir/keyrings/v1/test-keyring.keyring

    /// //

    /// # Ok(())

    /// # }

    /// ```

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(secret), fields(data_dir = ?data_dir.as_ref())))]

        data_dir: impl AsRef<Path>,

        name: &str,

        secret: Option<Secret>,

    ) -> Result<Self, Error> {

    }

    /// Open a named current-format keyring at a specific data directory with

    /// an already-derived key.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(key), fields(data_dir = ?data_dir.as_ref())))]

        data_dir: impl AsRef<Path>,

        name: &str,

        key: Key,

    ) -> Result<Self, Error> {

    }

    /// Lock the keyring.

        LockedKeyring {

        }

    }

    /// Lock an item using the keyring's key.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, item)))]

    }

    /// Unlock an item using the keyring's key.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, item)))]

    }

    /// Get the encryption key for this keyring.

    ///

    /// Returns `None` for unencrypted keyrings.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

    }

    /// Return the associated file if any.

    }

    /// Get the modification timestamp

    }

    /// Retrieve the number of items

    ///

    /// This function will not trigger a key derivation and can therefore be

    /// faster than [`items().len()`](Self::items).

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

    }

    /// Retrieve all items including those that cannot be decrypted.

    ///

    /// Returns a [`Vec`] where each element is either an [`UnlockedItem`] or an

    /// [`InvalidItemError`] for items that failed to decrypt.

    ///

    /// Use this method when you need to know about or handle decryption

    /// failures. For most use cases, [`items()`](Self::items) is more

    /// convenient as it only returns successfully decrypted items.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

        #[cfg(feature = "tracing")]

        let _span = tracing::debug_span!("decrypt_all", total_items = keyring.items.len());

            .items

                    )

                })

            })

    }

    /// Retrieve the list of available [`UnlockedItem`]s.

    ///

    /// Items that cannot be decrypted are silently skipped. Use

    /// [`all_items()`](Self::all_items) if you need access to decryption

    /// errors.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

    }

    /// Search items matching the attributes.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, attributes)))]

        &self,

        attributes: &impl AsAttributes,

    ) -> Result<Vec<UnlockedItem>, Error> {

        #[cfg(feature = "tracing")]

        tracing::debug!("Found {} matching items", results.len());

    }

    /// Find the first item matching the attributes.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, attributes)))]

        &self,

        attributes: &impl AsAttributes,

    ) -> Result<Option<UnlockedItem>, Error> {

    }

    /// Find the index in the list of items of the first item matching the

    /// attributes.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, attributes)))]

        &self,

        attributes: &impl AsAttributes,

    ) -> Result<Option<usize>, Error> {

    }

    /// Delete an item.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, attributes)))]

        #[cfg(feature = "tracing")]

        let items_before = { self.keyring.read().await.items.len() };

        {

        };

        #[cfg(feature = "tracing")]

        {

            let items_after = self.keyring.read().await.items.len();

            let deleted_count = items_before.saturating_sub(items_after);

            tracing::info!("Deleted {} items", deleted_count);

        }

    }

    /// Create a new item

    ///

    /// # Arguments

    ///

    /// * `label` - A user visible label of the item.

    /// * `attributes` - A map of key/value attributes, used to find the item

    ///   later.

    /// * `secret` - The secret to store.

    /// * `replace` - Whether to replace the value if the `attributes` matches

    ///   an existing `secret`.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, secret, attributes), fields(replace = replace)))]

        &self,

        label: &str,

        attributes: &impl AsAttributes,

        secret: impl Into<Secret>,

        replace: bool,

    ) -> Result<UnlockedItem, Error> {

            }

        };

                #[cfg(feature = "tracing")]

                tracing::error!("Failed to write keyring after item creation");

            }

            Ok(_) => {

                #[cfg(feature = "tracing")]

                tracing::info!("Successfully created item");

            }

        }

    }

    /// Replaces item at the given index.

    ///

    /// The `index` refers to the index of the [`Vec`] returned by

    /// [`items()`](Self::items). If the index does not exist, the functions

    /// returns an error.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, item), fields(index = index)))]

        {

            } else {

            }

        }

    }

    /// Deletes item at the given index.

    ///

    /// The `index` refers to the index of the [`Vec`] returned by

    /// [`items()`](Self::items). If the index does not exist, the functions

    /// returns an error.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self), fields(index = index)))]

        {

            } else {

            }

        }

    }

    /// Create multiple items in a single operation to avoid re-writing the file

    /// multiple times.

    ///

    /// This is more efficient than calling `create_item()` multiple times.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, items), fields(item_count = items.len())))]

        #[cfg(feature = "tracing")]

        let _span = tracing::debug_span!("bulk_create", items_to_create = items.len());

            }

        }

        #[cfg(feature = "tracing")]

        tracing::debug!("Writing keyring back to the file");

            // Update mtime after successful write

            }

        }

    }

    /// Write the changes to the keyring file.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

        {

            }

        };

        };

        }

    }

    /// Return key, derive and store it first if not initialized.

    ///

    /// Returns `None` when no secret is set (unencrypted keyring).

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

        {

            }

        }

        };

            #[cfg(feature = "async-std")]

            let key = blocking::unblock(move || {

                async_io::block_on(async { keyring.read().await.derive_key(&secret) })

            })

            .await?;

            #[cfg(feature = "tokio")]

            let key = {

                tokio::task::spawn_blocking(move || keyring.blocking_read().derive_key(&secret))

                    .await

                    .unwrap()?

            };

        }

    }

    /// Change keyring secret

    ///

    /// # Arguments

    ///

    /// * `secret` - The new secret to store.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, secret)))]

        #[cfg(feature = "tracing")]

        let _decrypt_span =

            tracing::debug_span!("decrypt_for_reencrypt", total_items = keyring.items.len());

        }

        #[cfg(feature = "tracing")]

        tracing::debug!("Updating secret and resetting key");

        // Unset the old key

        // Reset Keyring content before setting the new key

        // Set new key

        #[cfg(feature = "tracing")]

        let _reencrypt_span = tracing::debug_span!("reencrypt", total_items = items.len());

        }

    }

    /// Validate that a secret can decrypt the items in this keyring.

    ///

    /// For empty keyrings, this always returns `true` since there are no items

    /// to validate against.

    ///

    /// # Arguments

    ///

    /// * `secret` - The secret to validate.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self, secret)))]

    }

    }

    /// Delete any item that cannot be decrypted with the key associated to the

    /// keyring.

    ///

    /// This can only happen if an item was created using

    /// [`Self::load_unchecked`] or prior to 0.4 where we didn't validate

    /// the secret when using [`Self::load`] or modified externally.

    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]

        #[cfg(feature = "tracing")]

        let _span = tracing::debug_span!("identify_broken", total_items = keyring.items.len());

            }

        }

        #[cfg(feature = "tracing")]

        tracing::info!("Found {} broken items to delete", n_broken_items);

        #[cfg(feature = "tracing")]

        let _remove_span = tracing::debug_span!("remove_broken", broken_count = n_broken_items);

        }

    }

}