use async_trait::async_trait;

use crate::governed::command_trait::*;
use crate::governed::session::{GovernedSession, Governed};

pub struct PipelineCommand;

#[async_trait]
impl ShellCommand for PipelineCommand {
    fn name(&self) -> &str { "pipeline" }
    fn aliases(&self) -> Vec<&str> { vec!["pl"] }
    fn tier(&self) -> CommandTier { CommandTier::Engineer }
    fn required_scope(&self) -> RequiredScope {
        // Base command is read-only; subcommands like "trigger" require elevation.
        RequiredScope::ReadOnly
    }
    fn description(&self) -> &str { "Pipeline management (list, show, trigger)" }
    fn usage(&self) -> &str { "pipeline <list|show|trigger> [args...]" }

    async fn execute(
        &self,
        args: &[String],
        session: &mut GovernedSession,
    ) -> Result<CommandOutput, CommandError> {
        let subcommand = args.first().map(|s| s.as_str()).unwrap_or("list");

        match subcommand {
            "list" | "ls" => {
                let lines = vec![
                    OutputLine::Table {
                        headers: vec![
                            "RUN ID".to_string(),
                            "PIPELINE".to_string(),
                            "STATUS".to_string(),
                            "BRANCH".to_string(),
                        ],
                        rows: vec![
                            vec!["(no runs loaded)".to_string(), "-".to_string(), "-".to_string(), "-".to_string()],
                        ],
                    },
                ];
                Ok(CommandOutput { lines })
            }
            "show" => {
                let run_id = args.get(1).ok_or_else(|| {
                    CommandError::InvalidArgs("Usage: pipeline show <run_id>".to_string())
                })?;
                Ok(CommandOutput::text(format!(
                    "Pipeline run: {} (stub: not connected to runner-controller)",
                    run_id
                )))
            }
            "trigger" => {
                if session.tenant_context().is_none() {
                    return Err(CommandError::NoTenantContext);
                }
                // Trigger requires elevation.
                Err(CommandError::ElevationRequired {
                    registry: "pipeline".to_string(),
                    verb: "trigger".to_string(),
                })
            }
            _ => Err(CommandError::InvalidArgs(format!(
                "Unknown subcommand: {}. Use: list, show, trigger",
                subcommand
            ))),
        }
    }
}