use serde::Deserialize;
use std::collections::HashMap;
use std::path::Path;
use thiserror::Error as TeError;
use toml;
use wfassoc;

// region: Manifest

/// Raw user input manifest.
/// 
/// This manifest is the raw input of user.
/// Some fields may not be checked due to user invalid input.
#[derive(Debug, Deserialize)]
pub struct Manifest {
    identifier: String,
    path: String,
    clsid: String,

    name: Option<String>,
    icon: Option<String>,
    behavior: Option<String>,
    
    strs: HashMap<String, String>,
    icons: HashMap<String, String>,
    behaviors: HashMap<String, String>,
    exts: HashMap<String, ManifestExt>,
}

/// The sub-type in raw user input manifest.
#[derive(Debug, Deserialize)]
pub struct ManifestExt {
    name: String,
    icon: String,
    behavior: String,
}

// endregion

// region: Manifest Operation

/// Error occurs when parsing manifest TOML file.
#[derive(Debug, TeError)]
pub enum ParseManifestError {
    /// Io error
    #[error("IO error when reading manifest file")]
    Io(#[from] std::io::Error),
    /// Toml deserialization error
    #[error("given TOML manifest file has bad format")]
    Toml(#[from] toml::de::Error),
}

impl Manifest {
    /// Read user manifest.
    pub fn from_file(path: &Path) -> Result<Manifest, ParseManifestError> {
        let contents = std::fs::read_to_string(path)?;
        let config: Manifest = toml::from_str(&contents)?;
        Ok(config)
    }
}

/// Error occurs when parsing manifest into schema.
#[derive(Debug, TeError)]
pub enum ParseSchemaError {
    /// Error when operating with schema.
    #[error("{0}")]
    Schema(#[from] wfassoc::highlevel::SchemaError)
}

impl TryFrom<Manifest> for wfassoc::Schema {
    type Error = ParseSchemaError;

    fn try_from(value: Manifest) -> Result<Self, Self::Error> {
        let mut schema = wfassoc::Schema::new();
        
        schema.set_identifier(&value.identifier);
        schema.set_path(&value.path);
        schema.set_clsid(&value.clsid);
        schema.set_name(value.name.as_ref().map(|x| x.as_str()));
        schema.set_icon(value.icon.as_ref().map(|x| x.as_str()));
        schema.set_behavior(value.behavior.as_ref().map(|x| x.as_str()));
        for (key, value) in value.strs {
            schema.add_str(&key, &value)?;
        }
        for (key, value) in value.icons {
            schema.add_icon(&key, &value)?;
        }
        for (key, value) in value.behaviors {
            schema.add_behavior(&key, &value)?;
        }
        for (key, value) in value.exts {
            schema.add_ext(&key, &value.name, &value.icon, &value.behavior)?;
        }

        Ok(schema)
    }
}

// endregion