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// Copyright 2016 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

#![allow(dead_code)]

use std; // To refer to std::result::Result.

use std::collections::BTreeSet;

use rusqlite;

use edn;

use core_traits::{
    Attribute,
    ValueType,
};

use db_traits::errors::{
    DbError,
};
use query_algebrizer_traits::errors::{
    AlgebrizerError,
};
use query_projector_traits::errors::{
    ProjectorError,
};
use query_pull_traits::errors::{
    PullError,
};
use sql_traits::errors::{
    SQLError,
};

#[cfg(feature = "syncable")]
use tolstoy_traits::errors::{
    TolstoyError,
};

pub type Result<T> = std::result::Result<T, MentatError>;

#[derive(Debug, Fail)]
pub enum MentatError {
    #[fail(display = "bad uuid {}", _0)]
    BadUuid(String),

    #[fail(display = "path {} already exists", _0)]
    PathAlreadyExists(String),

    #[fail(display = "variables {:?} unbound at query execution time", _0)]
    UnboundVariables(BTreeSet<String>),

    #[fail(display = "invalid argument name: '{}'", _0)]
    InvalidArgumentName(String),

    #[fail(display = "unknown attribute: '{}'", _0)]
    UnknownAttribute(String),

    #[fail(display = "invalid vocabulary version")]
    InvalidVocabularyVersion,

    #[fail(display = "vocabulary {}/version {} already has attribute {}, and the requested definition differs", _0, _1, _2)]
    ConflictingAttributeDefinitions(String, u32, String, Attribute, Attribute),

    #[fail(display = "existing vocabulary {} too new: wanted version {}, got version {}", _0, _1, _2)]
    ExistingVocabularyTooNew(String, u32, u32),

    #[fail(display = "core schema: wanted version {}, got version {:?}", _0, _1)]
    UnexpectedCoreSchema(u32, Option<u32>),

    #[fail(display = "Lost the transact() race!")]
    UnexpectedLostTransactRace,

    #[fail(display = "missing core attribute {}", _0)]
    MissingCoreVocabulary(edn::query::Keyword),

    #[fail(display = "schema changed since query was prepared")]
    PreparedQuerySchemaMismatch,

    #[fail(display = "provided value of type {} doesn't match attribute value type {}", _0, _1)]
    ValueTypeMismatch(ValueType, ValueType),

    #[fail(display = "{}", _0)]
    IoError(#[cause] std::io::Error),

    /// We're just not done yet.  Message that the feature is recognized but not yet
    /// implemented.
    #[fail(display = "not yet implemented: {}", _0)]
    NotYetImplemented(String),

    // It would be better to capture the underlying `rusqlite::Error`, but that type doesn't
    // implement many useful traits, including `Clone`, `Eq`, and `PartialEq`.
    #[fail(display = "SQL error: {}", _0)]
    RusqliteError(String),

    #[fail(display = "{}", _0)]
    EdnParseError(#[cause] edn::ParseError),

    #[fail(display = "{}", _0)]
    DbError(#[cause] DbError),

    #[fail(display = "{}", _0)]
    AlgebrizerError(#[cause] AlgebrizerError),

    #[fail(display = "{}", _0)]
    ProjectorError(#[cause] ProjectorError),

    #[fail(display = "{}", _0)]
    PullError(#[cause] PullError),

    #[fail(display = "{}", _0)]
    SQLError(#[cause] SQLError),

    #[cfg(feature = "syncable")]
    #[fail(display = "{}", _0)]
    TolstoyError(#[cause] TolstoyError),
}

impl From<std::io::Error> for MentatError {
    fn from(error: std::io::Error) -> MentatError {
        MentatError::IoError(error)
    }
}

impl From<rusqlite::Error> for MentatError {
    fn from(error: rusqlite::Error) -> MentatError {
        MentatError::RusqliteError(error.to_string())
    }
}

impl From<edn::ParseError> for MentatError {
    fn from(error: edn::ParseError) -> MentatError {
        MentatError::EdnParseError(error)
    }
}

impl From<DbError> for MentatError {
    fn from(error: DbError) -> MentatError {
        MentatError::DbError(error)
    }
}

impl From<AlgebrizerError> for MentatError {
    fn from(error: AlgebrizerError) -> MentatError {
        MentatError::AlgebrizerError(error)
    }
}

impl From<ProjectorError> for MentatError {
    fn from(error: ProjectorError) -> MentatError {
        MentatError::ProjectorError(error)
    }
}

impl From<PullError> for MentatError {
    fn from(error: PullError) -> MentatError {
        MentatError::PullError(error)
    }
}

impl From<SQLError> for MentatError {
    fn from(error: SQLError) -> MentatError {
        MentatError::SQLError(error)
    }
}

#[cfg(feature = "syncable")]
impl From<TolstoyError> for MentatError {
    fn from(error: TolstoyError) -> MentatError {
        MentatError::TolstoyError(error)
    }
}