//! Repo connections — per-workspace binding of a repo provider (GitHub /
//! Gitea / GitLab) to the app_connections credential that holds its PAT.
//! Also stores the pull config: which owner to scope to, and (for self-
//! hosted providers) the base URL.
//!
//! The row's `id` is what shows up as `connection_id` on repos and in the
//! /api/repos/connections endpoints. The app_connections back-ref is
//! separate so tearing down the credential (revoke, rotate) doesn't
//! silently break the visible connection — deleting the app_connection
//! cascades here and blows away the repos too.

use cm_domain::WorkspaceId;
use sqlx::PgPool;
use time::OffsetDateTime;
use uuid::Uuid;

use crate::DbError;

pub struct RepoConnection {
    pub id: Uuid,
    pub workspace_id: Uuid,
    pub app_connection_id: Uuid,
    pub provider: String,
    pub owner: Option<String>,
    pub base_url: Option<String>,
    pub label: String,
    pub last_synced_at: Option<OffsetDateTime>,
    pub last_sync_error: Option<String>,
    pub created_at: OffsetDateTime,
    pub updated_at: OffsetDateTime,
}

pub struct NewRepoConnection<'a> {
    pub workspace_id: WorkspaceId,
    pub app_connection_id: Uuid,
    pub provider: &'a str,
    pub owner: Option<&'a str>,
    pub base_url: Option<&'a str>,
    pub label: &'a str,
}

pub async fn insert(pool: &PgPool, input: NewRepoConnection<'_>) -> Result<Uuid, DbError> {
    let id = Uuid::now_v7();
    sqlx::query!(
        "INSERT INTO repo_connections
            (id, workspace_id, app_connection_id, provider, owner, base_url, label)
         VALUES ($1, $2, $3, $4, $5, $6, $7)",
        id,
        input.workspace_id.as_uuid(),
        input.app_connection_id,
        input.provider,
        input.owner,
        input.base_url,
        input.label,
    )
    .execute(pool)
    .await?;
    Ok(id)
}

pub async fn list_for_workspace(
    pool: &PgPool,
    workspace_id: WorkspaceId,
) -> Result<Vec<RepoConnection>, DbError> {
    let rows = sqlx::query!(
        "SELECT id, workspace_id, app_connection_id, provider, owner, base_url,
                label, last_synced_at, last_sync_error, created_at, updated_at
           FROM repo_connections
          WHERE workspace_id = $1
          ORDER BY created_at DESC",
        workspace_id.as_uuid(),
    )
    .fetch_all(pool)
    .await?;
    Ok(rows
        .into_iter()
        .map(|r| RepoConnection {
            id: r.id,
            workspace_id: r.workspace_id,
            app_connection_id: r.app_connection_id,
            provider: r.provider,
            owner: r.owner,
            base_url: r.base_url,
            label: r.label,
            last_synced_at: r.last_synced_at,
            last_sync_error: r.last_sync_error,
            created_at: r.created_at,
            updated_at: r.updated_at,
        })
        .collect())
}

pub async fn get(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
) -> Result<RepoConnection, DbError> {
    let r = sqlx::query!(
        "SELECT id, workspace_id, app_connection_id, provider, owner, base_url,
                label, last_synced_at, last_sync_error, created_at, updated_at
           FROM repo_connections
          WHERE id = $1 AND workspace_id = $2",
        id,
        workspace_id.as_uuid(),
    )
    .fetch_optional(pool)
    .await?
    .ok_or(DbError::NotFound)?;
    Ok(RepoConnection {
        id: r.id,
        workspace_id: r.workspace_id,
        app_connection_id: r.app_connection_id,
        provider: r.provider,
        owner: r.owner,
        base_url: r.base_url,
        label: r.label,
        last_synced_at: r.last_synced_at,
        last_sync_error: r.last_sync_error,
        created_at: r.created_at,
        updated_at: r.updated_at,
    })
}

/// Patch the mutable metadata of a connection. Any `None` field is left
/// untouched. Rotating the underlying PAT is a separate flow (delete + re-
/// create through the wizard) — the connection row doesn't own the credential.
pub async fn update(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
    owner: Option<Option<&str>>,
    base_url: Option<Option<&str>>,
    label: Option<&str>,
) -> Result<bool, DbError> {
    // COALESCE lets us pass a sentinel per-field: NULL means "leave alone",
    // anything else means "set to this". `owner` and `base_url` need the
    // second-nested Option so we can distinguish clear-to-null from no-op.
    let owner_set = owner.is_some();
    let owner_val = owner.and_then(|v| v.map(str::to_owned));
    let base_url_set = base_url.is_some();
    let base_url_val = base_url.and_then(|v| v.map(str::to_owned));
    let label_val = label.map(str::to_owned);
    let res = sqlx::query!(
        "UPDATE repo_connections
            SET owner    = CASE WHEN $3 THEN $4 ELSE owner    END,
                base_url = CASE WHEN $5 THEN $6 ELSE base_url END,
                label    = COALESCE($7, label),
                updated_at = now()
          WHERE id = $1 AND workspace_id = $2",
        id,
        workspace_id.as_uuid(),
        owner_set,
        owner_val,
        base_url_set,
        base_url_val,
        label_val,
    )
    .execute(pool)
    .await?;
    Ok(res.rows_affected() == 1)
}

pub async fn delete(pool: &PgPool, id: Uuid, workspace_id: WorkspaceId) -> Result<bool, DbError> {
    let res = sqlx::query!(
        "DELETE FROM repo_connections WHERE id = $1 AND workspace_id = $2",
        id,
        workspace_id.as_uuid(),
    )
    .execute(pool)
    .await?;
    Ok(res.rows_affected() == 1)
}

/// Called after a sync run; timestamps the row and stores the error (or
/// clears it on success).
pub async fn mark_synced(pool: &PgPool, id: Uuid, error: Option<&str>) -> Result<(), DbError> {
    sqlx::query!(
        "UPDATE repo_connections
            SET last_synced_at = now(),
                last_sync_error = $2,
                updated_at = now()
          WHERE id = $1",
        id,
        error,
    )
    .execute(pool)
    .await?;
    Ok(())
}