mod conn;
pub mod entities;
mod migrator;

use sea_orm::{
    ActiveModelTrait, ColumnTrait, ConnectOptions, Database, DatabaseConnection, DeleteResult,
    DeriveActiveEnum, EntityTrait, EnumIter, InsertResult, ModelTrait, NotSet, PaginatorTrait,
    QueryFilter, QueryOrder, Set,
};
use sea_orm_migration::MigratorTrait;
use serde::{Deserialize, Serialize};

pub use entities::{prelude::*, *};
use migrator::Migrator;

type Result<T> = std::result::Result<T, sea_orm::DbErr>;

#[derive(EnumIter, DeriveActiveEnum, Serialize, Deserialize, PartialEq, Eq, Clone, Debug)]
#[sea_orm(rs_type = "String", db_type = "String(Some(6))")]
pub enum PackageDepend {
    #[sea_orm(string_value = "depend")]
    Depend,
    #[sea_orm(string_value = "make")]
    Make,
    #[sea_orm(string_value = "check")]
    Check,
    #[sea_orm(string_value = "opt")]
    Opt,
}

#[derive(Serialize)]
pub struct FullPackage {
    #[serde(flatten)]
    entry: package::Model,
    licenses: Vec<String>,
    groups: Vec<String>,
    replaces: Vec<String>,
    provides: Vec<String>,
    depends: Vec<(PackageDepend, String)>,
    files: Vec<String>,
}

#[derive(Clone, Debug)]
pub struct RieterDb {
    pub conn: DatabaseConnection,
}

impl RieterDb {
    pub async fn connect<C: Into<ConnectOptions>>(opt: C) -> Result<Self> {
        let db = Database::connect(opt).await?;

        Migrator::up(&db, None).await?;

        Ok(Self { conn: db })
    }

    pub async fn repos(&self, per_page: u64, page: u64) -> Result<(u64, Vec<repo::Model>)> {
        let paginator = Repo::find()
            .order_by_asc(repo::Column::Id)
            .paginate(&self.conn, per_page);
        let repos = paginator.fetch_page(page).await?;
        let total_pages = paginator.num_pages().await?;

        Ok((total_pages, repos))
    }

    pub async fn repo(&self, id: i32) -> Result<Option<repo::Model>> {
        repo::Entity::find_by_id(id).one(&self.conn).await
    }

    pub async fn repo_by_name(&self, name: &str) -> Result<Option<repo::Model>> {
        Repo::find()
            .filter(repo::Column::Name.eq(name))
            .one(&self.conn)
            .await
    }

    pub async fn insert_repo(
        &self,
        name: &str,
        description: Option<&str>,
    ) -> Result<InsertResult<repo::ActiveModel>> {
        let model = repo::ActiveModel {
            id: NotSet,
            name: Set(String::from(name)),
            description: Set(description.map(String::from)),
        };

        Repo::insert(model).exec(&self.conn).await
    }

    pub async fn packages(&self, per_page: u64, page: u64) -> Result<(u64, Vec<package::Model>)> {
        let paginator = Package::find()
            .order_by_asc(package::Column::Id)
            .paginate(&self.conn, per_page);
        let packages = paginator.fetch_page(page).await?;
        let total_pages = paginator.num_pages().await?;

        Ok((total_pages, packages))
    }

    pub async fn package(&self, id: i32) -> Result<Option<package::Model>> {
        package::Entity::find_by_id(id).one(&self.conn).await
    }

    pub async fn package_by_fields(
        &self,
        repo_id: i32,
        name: &str,
        version: Option<&str>,
        arch: &str,
    ) -> Result<Option<package::Model>> {
        let mut query = Package::find()
            .filter(package::Column::RepoId.eq(repo_id))
            .filter(package::Column::Name.eq(name))
            .filter(package::Column::Arch.eq(arch));

        if let Some(version) = version {
            query = query.filter(package::Column::Version.eq(version));
        }

        query.one(&self.conn).await
    }

    pub async fn delete_packages_with_arch(
        &self,
        repo_id: i32,
        arch: &str,
    ) -> Result<DeleteResult> {
        Package::delete_many()
            .filter(package::Column::RepoId.eq(repo_id))
            .filter(package::Column::Arch.eq(arch))
            .exec(&self.conn)
            .await
    }

    pub async fn insert_package(
        &self,
        repo_id: i32,
        pkg: crate::repo::package::Package,
    ) -> Result<()> {
        let info = pkg.info;

        let model = package::ActiveModel {
            id: NotSet,
            repo_id: Set(repo_id),
            base: Set(info.base),
            name: Set(info.name),
            version: Set(info.version),
            arch: Set(info.arch),
            size: Set(info.size),
            c_size: Set(info.csize),
            description: Set(info.description),
            url: Set(info.url),
            build_date: Set(info.build_date),
            packager: Set(info.packager),
            pgp_sig: Set(info.pgpsig),
            pgp_sig_size: Set(info.pgpsigsize),
            sha256_sum: Set(info.sha256sum),
        };

        let pkg_entry = model.insert(&self.conn).await?;

        // Insert all the related tables
        PackageLicense::insert_many(info.licenses.iter().map(|s| package_license::ActiveModel {
            package_id: Set(pkg_entry.id),
            value: Set(s.to_string()),
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        PackageGroup::insert_many(info.groups.iter().map(|s| package_group::ActiveModel {
            package_id: Set(pkg_entry.id),
            value: Set(s.to_string()),
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        PackageReplaces::insert_many(info.replaces.iter().map(|s| package_replaces::ActiveModel {
            package_id: Set(pkg_entry.id),
            value: Set(s.to_string()),
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        PackageConflicts::insert_many(info.conflicts.iter().map(|s| {
            package_conflicts::ActiveModel {
                package_id: Set(pkg_entry.id),
                value: Set(s.to_string()),
            }
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        PackageProvides::insert_many(info.provides.iter().map(|s| package_provides::ActiveModel {
            package_id: Set(pkg_entry.id),
            value: Set(s.to_string()),
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        PackageFile::insert_many(pkg.files.iter().map(|s| package_file::ActiveModel {
            package_id: Set(pkg_entry.id),
            value: Set(s.display().to_string()),
        }))
        .on_empty_do_nothing()
        .exec(self)
        .await?;

        let deps = info
            .depends
            .iter()
            .map(|d| (PackageDepend::Depend, d))
            .chain(info.makedepends.iter().map(|d| (PackageDepend::Make, d)))
            .chain(info.checkdepends.iter().map(|d| (PackageDepend::Check, d)))
            .chain(info.optdepends.iter().map(|d| (PackageDepend::Opt, d)))
            .map(|(t, s)| package_depends::ActiveModel {
                package_id: Set(pkg_entry.id),
                r#type: Set(t),
                value: Set(s.to_string()),
            });

        PackageDepends::insert_many(deps)
            .on_empty_do_nothing()
            .exec(self)
            .await?;

        Ok(())
    }

    pub async fn full_package(&self, id: i32) -> Result<Option<FullPackage>> {
        if let Some(entry) = self.package(id).await? {
            let licenses = entry
                .find_related(PackageLicense)
                .all(self)
                .await?
                .into_iter()
                .map(|e| e.value)
                .collect();
            let groups = entry
                .find_related(PackageGroup)
                .all(self)
                .await?
                .into_iter()
                .map(|e| e.value)
                .collect();
            let replaces = entry
                .find_related(PackageReplaces)
                .all(self)
                .await?
                .into_iter()
                .map(|e| e.value)
                .collect();
            let provides = entry
                .find_related(PackageProvides)
                .all(self)
                .await?
                .into_iter()
                .map(|e| e.value)
                .collect();
            let depends = entry
                .find_related(PackageDepends)
                .all(self)
                .await?
                .into_iter()
                .map(|e| (e.r#type, e.value))
                .collect();
            let files = entry
                .find_related(PackageFile)
                .all(self)
                .await?
                .into_iter()
                .map(|e| e.value)
                .collect();

            Ok(Some(FullPackage {
                entry,
                licenses,
                groups,
                replaces,
                provides,
                depends,
                files,
            }))
        } else {
            Ok(None)
        }
    }
}