use std::fs;

use indexmap::IndexMap as HashMap;
use serde::{Deserialize, Serialize};

use crate::codegen::project_root;

pub fn get() -> Schema {
    let path = project_root().join("schema.ron");
    let text = fs::read_to_string(path).unwrap();
    let schema = ron::from_str::<Schema>(&text).unwrap();

    let schema = super::patch::patch_schema(schema);
    let schema = super::patch::patch_ty(schema);

    schema
}

#[derive(Debug, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Schema {
    pub api_version: ApiVersion,
    pub methods: Vec<Method>,
    pub tg_categories: HashMap<String, String>,
}

#[derive(Debug, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct ApiVersion {
    pub ver: String,
    pub date: String,
}

#[derive(Debug, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Method {
    pub names: (String, String, String),
    pub return_ty: Type,
    pub doc: Doc,
    pub tg_doc: String,
    pub tg_category: String,
    #[serde(default)]
    pub notes: Vec<Doc>,
    pub params: Vec<Param>,
    #[serde(default)]
    pub sibling: Option<String>,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Doc {
    pub md: String,
    #[serde(default)]
    pub md_links: HashMap<String, String>,
}

#[derive(Debug, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Param {
    pub name: String,
    pub ty: Type,
    pub descr: Doc,
}

#[allow(non_camel_case_types)]
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub enum Type {
    True,
    u8,
    u16,
    u32,
    i32,
    u64,
    i64,
    f64,
    bool,
    String,
    Option(Box<Type>),
    ArrayOf(Box<Type>),
    RawTy(String),

    Url,
    DateTime,
}

impl std::fmt::Display for Type {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Type::True => write!(f, "True"),
            Type::u8 => write!(f, "u8"),
            Type::u16 => write!(f, "u16"),
            Type::u32 => write!(f, "u32"),
            Type::i32 => write!(f, "i32"),
            Type::u64 => write!(f, "u64"),
            Type::i64 => write!(f, "i64"),
            Type::f64 => write!(f, "f64"),
            Type::bool => write!(f, "bool"),
            Type::String => write!(f, "String"),
            Type::Option(inner) => write!(f, "Option<{}>", inner),
            Type::ArrayOf(inner) => write!(f, "Vec<{}>", inner),
            Type::RawTy(raw) => f.write_str(raw),
            Type::Url => write!(f, "Url"),
            Type::DateTime => write!(f, "DateTime<Utc>"),
        }
    }
}