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use itertools::Itertools;
use openvet_common::rust::CrateName;
use rusqlite::Connection;
use semver::Version;
use serde::{Deserialize, Serialize};
use std::marker::PhantomData;
#[cfg(test)]
use test_strategy::Arbitrary;
use thiserror::Error;

#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[serde(from = "i64")]
pub struct Reference<T> {
    value: i64,
    target: PhantomData<T>,
}

impl<T> Reference<T> {
    pub fn new(value: i64) -> Self {
        Self {
            value,
            target: PhantomData,
        }
    }
}

impl<T> From<i64> for Reference<T> {
    fn from(value: i64) -> Self {
        Self::new(value)
    }
}

#[derive(Error, Debug)]
pub enum InsertError {
    #[error(transparent)]
    Encoding(#[from] serde_rusqlite::Error),
    #[error(transparent)]
    Database(#[from] rusqlite::Error),
}

pub trait Insert: Serialize {
    fn table(&self) -> &str;

    fn insert_or_ignore(&self, connection: &Connection) -> Result<i64, InsertError> {
        let params = serde_rusqlite::to_params_named(self)?;
        let table = self.table();
        let columns = params
            .to_slice()
            .iter()
            .map(|(name, _)| &name[1..])
            .join(", ");
        let names = params
            .to_slice()
            .iter()
            .map(|(name, _)| self.column(name).unwrap_or(name))
            .join(", ");
        let query = format!("INSERT OR IGNORE INTO {table}({columns}) VALUES ({names})");
        connection.execute(&query, &*params.to_slice())?;
        Ok(0)
    }

    fn insert_or_update(&self, connection: &Connection) -> Result<i64, InsertError> {
        let params = serde_rusqlite::to_params_named(self)?;
        let table = self.table();
        let columns = params
            .to_slice()
            .iter()
            .map(|(name, _)| &name[1..])
            .join(", ");
        let names = params
            .to_slice()
            .iter()
            .map(|(name, _)| self.column(name).unwrap_or(name))
            .join(", ");
        let query = format!("INSERT OR UPDATE INTO {table}({columns}) VALUES ({names})");
        connection.execute(&query, &*params.to_slice())?;
        Ok(0)
    }

    fn insert(&self, connection: &Connection) -> Result<i64, InsertError> {
        let params = serde_rusqlite::to_params_named(self)?;
        let table = self.table();
        let columns = params
            .to_slice()
            .iter()
            .map(|(name, _)| &name[1..])
            .join(", ");
        let names = params
            .to_slice()
            .iter()
            .map(|(name, _)| self.column(name).unwrap_or(name))
            .join(", ");
        let query = format!("INSERT INTO {table}({columns}) VALUES ({names})");
        connection.execute(&query, &*params.to_slice())?;
        Ok(0)
    }

    fn column(&self, name: &str) -> Option<&str> {
        None
    }
}

#[derive(Serialize, Deserialize)]
pub struct RustCrateRow {
    id: Reference<Self>,
    #[serde(rename = "crate")]
    krate: CrateName,
}

#[derive(Serialize, Deserialize, Debug, PartialOrd, Ord, PartialEq, Eq)]
#[cfg_attr(test, derive(Arbitrary))]
pub struct InsertRustCrate {
    pub name: CrateName,
}

impl Insert for InsertRustCrate {
    fn table(&self) -> &str {
        "rust_crates"
    }
}

#[derive(Serialize, Deserialize)]
pub struct RustCrateVersionRow {
    pub id: Reference<Self>,
    #[serde(rename = "crate")]
    pub krate: CrateName,
    pub version: Version,
    pub files: Option<String>,
}

#[derive(Serialize, Deserialize, Debug)]
#[cfg_attr(test, derive(Arbitrary))]
pub struct InsertRustCrateVersion {
    #[serde(rename = "crate")]
    pub krate: CrateName,
    #[cfg_attr(test, strategy(openvet_common::proptest::version()))]
    pub version: Version,
}

impl Insert for InsertRustCrateVersion {
    fn table(&self) -> &str {
        "rust_crate_versions"
    }

    fn column(&self, name: &str) -> Option<&str> {
        match name {
            ":crate" => Some("(SELECT id FROM rust_crates WHERE name = :crate)"),
            _ => None,
        }
    }
}