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use crate::configuration_provider::ConfigurationProvider;
use crate::value::number::Number;
use crate::value::Value;
use std::collections::HashMap;
use std::fs;
use std::io;
use std::path::{Path, PathBuf};
use thiserror::Error;

#[derive(Debug)]
pub struct YamlProvider(Value);

#[derive(Error, Debug)]
pub enum CreateYamlProviderFromFileError {
    /// Failed to read file
    ///
    /// Example: File is missing
    #[error("Failed to read configuration file [file_path = `{file_path}`]")]
    FailedToReadFile {
        file_path: PathBuf,
        #[source]
        error: io::Error,
    },

    /// Failed to parse file
    ///
    /// Example: Invalid formatting
    #[error("Failed to parse configuration file [file_path = `{file_path}`]")]
    FailedToDeserialize {
        file_path: PathBuf,
        #[source]
        error: serde_yaml::Error,
    },

    /// Invalid configuration
    ///
    /// Example: Key is not a string
    #[error("Invalid configuration [file_path = `{file_path}`]")]
    InvalidConfiguration {
        file_path: PathBuf,
        #[source]
        error: InvalidConfigurationError,
    },
}

#[derive(Error, Debug)]
pub enum CreateYamlProviderFromStringError {
    /// Failed to parse file
    #[error("Failed to parse config")]
    FailedToDeserialize(#[from] serde_yaml::Error),

    /// Invalid configuration
    ///
    /// Example: Key is not a string
    #[error("Invalid configuration")]
    InvalidConfiguration(#[from] InvalidConfigurationError),
}

#[derive(Error, Debug)]
pub enum InvalidConfigurationError {
    #[error("Key is not a string")]
    KeyIsNotAString,

    #[error("Tags not supported")]
    TagsNotSupported,

    #[error("Internal error")]
    InternalError,
}

impl YamlProvider {
    pub fn from_str(config: &str) -> Result<Self, CreateYamlProviderFromStringError> {
        let value = serde_yaml::from_str::<serde_yaml::value::Value>(config)?;

        Ok(YamlProvider(map_yaml_value_into_value(value)?))
    }

    pub fn from_path(file_path: impl AsRef<Path>) -> Result<Self, CreateYamlProviderFromFileError> {
        let configuration = match fs::read_to_string(file_path.as_ref()) {
            Ok(v) => v,
            Err(error) => {
                let fp = file_path.as_ref().to_path_buf();
                return Err(CreateYamlProviderFromFileError::FailedToReadFile {
                    file_path: fp.canonicalize().unwrap_or(fp),
                    error,
                });
            }
        };

        Self::from_str(&configuration).map_err(|err| {
            let file_path = file_path.as_ref().to_path_buf();

            match err {
                CreateYamlProviderFromStringError::FailedToDeserialize(error) => {
                    CreateYamlProviderFromFileError::FailedToDeserialize { file_path, error }
                }
                CreateYamlProviderFromStringError::InvalidConfiguration(error) => {
                    CreateYamlProviderFromFileError::InvalidConfiguration { file_path, error }
                }
            }
        })
    }
}

impl ConfigurationProvider for YamlProvider {
    fn provide(&self) -> Value {
        self.0.clone()
    }
}

fn map_yaml_value_into_value(
    value: serde_yaml::value::Value,
) -> Result<Value, InvalidConfigurationError> {
    match value {
        serde_yaml::Value::Null => Ok(Value::None),
        serde_yaml::Value::Bool(bool) => Ok(Value::Bool(bool)),
        serde_yaml::Value::Number(number) => {
            if let Some(number) = number.as_i64() {
                return Ok(Value::Number(Number::Integer(number)));
            }

            if let Some(number) = number.as_u64() {
                return Ok(Value::Number(Number::UInteger(number)));
            }

            if let Some(number) = number.as_f64() {
                return Ok(Value::Number(Number::Float(number)));
            }

            Err(InvalidConfigurationError::InternalError)
        }
        serde_yaml::Value::String(string) => Ok(Value::String(string)),
        serde_yaml::Value::Sequence(seq) => Ok(Value::Array(
            seq.into_iter()
                .map(map_yaml_value_into_value)
                .collect::<Result<Vec<_>, InvalidConfigurationError>>()?,
        )),
        serde_yaml::Value::Mapping(map) => map
            .into_iter()
            .map(|(k, v)| {
                let key = match k {
                    serde_yaml::Value::String(string) => string,
                    _ => return Err(InvalidConfigurationError::KeyIsNotAString),
                };

                Ok((key, map_yaml_value_into_value(v)?))
            })
            .collect::<Result<HashMap<String, Value>, InvalidConfigurationError>>()
            .map(Value::Map),
        serde_yaml::Value::Tagged(_) => {
            return Err(InvalidConfigurationError::TagsNotSupported);
        }
    }
}