//! The `repositories` and `pushes` tables.

use super::{now_ms, Pool};

use hub_api::Visibility;

use sqlx::FromRow;

#[derive(Clone, Debug, FromRow)]

pub struct RepoRow {

    pub id: i64,

    pub owner: String,

    pub name: String,

    pub description: String,

    pub default_bookmark: String,

    pub visibility: String,

    pub created_ms: i64,

    pub updated_ms: i64,

    #[sqlx(default)]

    pub git_mirror: bool,

    #[sqlx(default)]

    pub git_mirror_state: String,

    /// The repository this one was forked from (migration 0009).

    #[sqlx(default)]

    pub forked_from: Option<i64>,

    /// Space-separated topics (migration 0010).

    #[sqlx(default)]

    pub topics: String,

    /// Counts for the tabs; filled by `get` only.

    #[sqlx(default)]

    pub open_issues: i64,

    #[sqlx(default)]

    pub open_proposals: i64,

}

impl RepoRow {

    pub fn visibility(&self) -> Visibility {

        Visibility::parse(&self.visibility).unwrap_or(Visibility::Private)

    }

    pub fn topic_list(&self) -> Vec<&str> {

        self.topics.split_whitespace().collect()

    }

    pub fn slug(&self) -> String {

        format!("{}/{}", self.owner, self.name)

    }

}

#[derive(Clone, Debug, FromRow)]

pub struct PushRow {

    pub id: i64,

    pub at_ms: i64,

    pub reference: String,

    pub ok: bool,

    pub reason: String,

    pub old_state: String,

    pub new_state: String,

    pub heads: i64,

    pub changes: i64,

    pub pusher: String,

}

/// One reference's outcome in a push, as the protocol backend reports it.

#[derive(Clone, Debug)]

pub struct PushOutcome {

    pub reference: String,

    pub ok: bool,

    pub reason: String,

    pub old_state: String,

    pub new_state: String,

    pub heads: i64,

    pub changes: i64,

}

pub async fn list(pool: &Pool) -> sqlx::Result<Vec<RepoRow>> {

    sqlx::query_as("SELECT * FROM repositories ORDER BY updated_ms DESC, owner, name").fetch_all(pool).await

}

pub async fn get_by_id(pool: &Pool, id: i64) -> sqlx::Result<Option<RepoRow>> {

    sqlx::query_as("SELECT * FROM repositories WHERE id = ?").bind(id).fetch_optional(pool).await

}

pub async fn list_by_owner(pool: &Pool, owner: &str) -> sqlx::Result<Vec<RepoRow>> {

    sqlx::query_as("SELECT * FROM repositories WHERE owner = ? ORDER BY updated_ms DESC, name").bind(owner).fetch_all(pool).await

}

/// One repository, with its open issue and proposal counts for the tabs.

pub async fn get(pool: &Pool, owner: &str, name: &str) -> sqlx::Result<Option<RepoRow>> {

    sqlx::query_as(

        "SELECT r.*, \

           (SELECT COUNT(*) FROM issues i WHERE i.repo_id = r.id AND i.state = 'open') AS open_issues, \

           (SELECT COUNT(*) FROM proposals p WHERE p.repo_id = r.id AND p.state IN ('open', 'draft')) AS open_proposals \

         FROM repositories r WHERE r.owner = ? AND r.name = ?",

    )

    .bind(owner)

    .bind(name)

    .fetch_optional(pool)

    .await

}

pub async fn create(pool: &Pool, owner: &str, name: &str, description: &str, visibility: Visibility) -> sqlx::Result<RepoRow> {

    let now = now_ms();

    sqlx::query_as(

        "INSERT INTO repositories (owner, name, description, visibility, created_ms, updated_ms) VALUES (?, ?, ?, ?, ?, ?) RETURNING *",

    )

    .bind(owner)

    .bind(name)

    .bind(description)

    .bind(visibility.as_str())

    .bind(now)

    .bind(now)

    .fetch_one(pool)

    .await

}

pub async fn delete(pool: &Pool, id: i64) -> sqlx::Result<()> {

    sqlx::query("DELETE FROM repositories WHERE id = ?").bind(id).execute(pool).await?;

    Ok(())

}

pub async fn set_description(pool: &Pool, id: i64, description: &str) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET description = ? WHERE id = ?").bind(description).bind(id).execute(pool).await?;

    Ok(())

}

pub async fn set_default_bookmark(pool: &Pool, id: i64, bookmark: &str) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET default_bookmark = ? WHERE id = ?").bind(bookmark).bind(id).execute(pool).await?;

    Ok(())

}

pub async fn set_visibility(pool: &Pool, id: i64, visibility: Visibility) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET visibility = ? WHERE id = ?").bind(visibility.as_str()).bind(id).execute(pool).await?;

    Ok(())

}

/// Record a push's per-reference results and bump the repository's activity.

pub async fn record_push(pool: &Pool, id: i64, pusher: Option<(i64, &str)>, results: &[PushOutcome]) -> sqlx::Result<()> {

    let now = now_ms();

    let mut tx = pool.begin().await?;

    for r in results {

        sqlx::query("INSERT INTO pushes (repo_id, at_ms, reference, ok, reason, old_state, new_state, heads, changes, account_id, pusher) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)")

            .bind(id)

            .bind(now)

            .bind(&r.reference)

            .bind(r.ok)

            .bind(&r.reason)

            .bind(&r.old_state)

            .bind(&r.new_state)

            .bind(r.heads)

            .bind(r.changes)

            .bind(pusher.map(|p| p.0).filter(|id| *id > 0))

            .bind(pusher.map(|p| p.1).unwrap_or(""))

            .execute(&mut *tx)

            .await?;

    }

    if results.iter().any(|r| r.ok) {

        sqlx::query("UPDATE repositories SET updated_ms = ? WHERE id = ?").bind(now).bind(id).execute(&mut *tx).await?;

    }

    tx.commit().await

}

pub async fn pushes(pool: &Pool, id: i64, limit: i64) -> sqlx::Result<Vec<PushRow>> {

    sqlx::query_as("SELECT id, at_ms, reference, ok, reason, old_state, new_state, heads, changes, pusher FROM pushes WHERE repo_id = ? ORDER BY at_ms DESC, id DESC LIMIT ?")

        .bind(id)

        .bind(limit)

        .fetch_all(pool)

        .await

}

/// Topics from user input: comma or space separated, lower-cased,

/// letters, digits and dashes, at most 35 characters each and 20 in all.

/// Returns the stored form or what is wrong.

pub fn parse_topics(input: &str) -> Result<String, String> {

    let mut out: Vec<String> = Vec::new();

    for t in input.split([',', ' ', '\n', '\t']).map(|t| t.trim().to_ascii_lowercase()).filter(|t| !t.is_empty()) {

        if t.len() > 35 || !t.chars().all(|c| c.is_ascii_alphanumeric() || c == '-') || t.starts_with('-') {

            return Err(format!("\"{t}\" is not a topic: use letters, digits and dashes, up to 35 characters"));

        }

        if !out.contains(&t) {

            out.push(t);

        }

    }

    if out.len() > 20 {

        return Err("At most 20 topics.".into());

    }

    Ok(out.join(" "))

}

pub async fn set_topics(pool: &Pool, id: i64, topics: &str) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET topics = ? WHERE id = ?").bind(topics).bind(id).execute(pool).await?;

    Ok(())

}

/// Star or unstar; returns whether it is now starred.

pub async fn toggle_star(pool: &Pool, account_id: i64, repo_id: i64) -> sqlx::Result<bool> {

    let gone = sqlx::query("DELETE FROM stars WHERE account_id = ? AND repo_id = ?").bind(account_id).bind(repo_id).execute(pool).await?;

    if gone.rows_affected() > 0 {

        return Ok(false);

    }

    sqlx::query("INSERT INTO stars (account_id, repo_id, at_ms) VALUES (?, ?, ?)")

        .bind(account_id)

        .bind(repo_id)

        .bind(now_ms())

        .execute(pool)

        .await?;

    Ok(true)

}

pub async fn starred(pool: &Pool, account_id: i64, repo_id: i64) -> sqlx::Result<bool> {

    let n: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM stars WHERE account_id = ? AND repo_id = ?")

        .bind(account_id)

        .bind(repo_id)

        .fetch_one(pool)

        .await?;

    Ok(n > 0)

}

/// Stars and watchers of one repository.

pub async fn counts(pool: &Pool, repo_id: i64) -> sqlx::Result<(i64, i64)> {

    let stars: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM stars WHERE repo_id = ?").bind(repo_id).fetch_one(pool).await?;

    let watchers: i64 = sqlx::query_scalar("SELECT COUNT(*) FROM watches WHERE repo_id = ?").bind(repo_id).fetch_one(pool).await?;

    Ok((stars, watchers))

}

/// Star counts of every starred repository.

pub async fn star_counts(pool: &Pool) -> sqlx::Result<std::collections::HashMap<i64, i64>> {

    let rows: Vec<(i64, i64)> = sqlx::query_as("SELECT repo_id, COUNT(*) FROM stars GROUP BY repo_id").fetch_all(pool).await?;

    Ok(rows.into_iter().collect())

}

/// Record that `id` is a fork of `from`.

pub async fn set_forked_from(pool: &Pool, id: i64, from: i64) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET forked_from = ? WHERE id = ?").bind(from).bind(id).execute(pool).await?;

    Ok(())

}

/// The forks of `id`, newest activity first.

pub async fn forks_of(pool: &Pool, id: i64) -> sqlx::Result<Vec<RepoRow>> {

    sqlx::query_as("SELECT * FROM repositories WHERE forked_from = ? ORDER BY updated_ms DESC").bind(id).fetch_all(pool).await

}

pub async fn set_git_mirror(pool: &Pool, id: i64, on: bool) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET git_mirror = ? WHERE id = ?").bind(on).bind(id).execute(pool).await?;

    Ok(())

}

pub async fn set_git_mirror_state(pool: &Pool, id: i64, state: &str) -> sqlx::Result<()> {

    sqlx::query("UPDATE repositories SET git_mirror_state = ? WHERE id = ?").bind(state).bind(id).execute(pool).await?;

    Ok(())

}

#[cfg(test)]

mod topic_tests {

    use super::parse_topics;

    #[test]

    fn topics_are_normalised_and_checked() {

        assert_eq!(parse_topics("Rust, vcs  retro-computing,rust").unwrap(), "rust vcs retro-computing");

        assert_eq!(parse_topics("").unwrap(), "");

        assert!(parse_topics("c++").is_err());

        assert!(parse_topics("-lead").is_err());

        assert!(parse_topics(&"x".repeat(36)).is_err());

        assert!(parse_topics(&(0..21).map(|i| format!("t{i}")).collect::<Vec<_>>().join(" ")).is_err());

    }

}