mod completer;

use crate::cli::completer::{
    ShellCompletion, agent_completer, macro_completer, model_completer, rag_completer,
    role_completer, secrets_completer, session_completer,
};
use crate::config::{AssetCategory, InstallFilter};
use anyhow::{Context, Result};
use clap::ValueHint;
use clap::{Parser, crate_authors, crate_description, crate_version};
use clap_complete::ArgValueCompleter;
use is_terminal::IsTerminal;
use std::io::{Read, stdin};

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None)]
#[command(
	name = "loki",
	author = crate_authors!(),
	version = crate_version!(),
	about = crate_description!(),
	help_template = "\
{before-help}{name} {version}
{author-with-newline}
{about-with-newline}
{usage-heading} {usage}

{all-args}{after-help}
"
)]
pub struct Cli {
    /// Select a LLM model
    #[arg(short, long, add = ArgValueCompleter::new(model_completer))]
    pub model: Option<String>,
    /// Use the system prompt
    #[arg(long)]
    pub prompt: Option<String>,
    /// Select a role
    #[arg(short, long, add = ArgValueCompleter::new(role_completer))]
    pub role: Option<String>,
    /// Start or join a session
    #[arg(short = 's', long, add = ArgValueCompleter::new(session_completer))]
    pub session: Option<Option<String>>,
    /// Ensure the session is empty
    #[arg(long)]
    pub empty_session: bool,
    /// Ensure the new conversation is saved to the session
    #[arg(long)]
    pub save_session: bool,
    /// Start an agent
    #[arg(short = 'a', long, add = ArgValueCompleter::new(agent_completer))]
    pub agent: Option<String>,
    /// Set agent variables
    #[arg(long, value_names = ["NAME", "VALUE"], num_args = 2)]
    pub agent_variable: Vec<String>,
    /// Start a RAG
    #[arg(long, add = ArgValueCompleter::new(rag_completer))]
    pub rag: Option<String>,
    /// Rebuild the RAG to sync document changes
    #[arg(long)]
    pub rebuild_rag: bool,
    /// Execute a macro
    #[arg(long = "macro", value_name = "MACRO", add = ArgValueCompleter::new(macro_completer))]
    pub macro_name: Option<String>,
    /// Execute commands in natural language
    #[arg(short = 'e', long)]
    pub execute: bool,
    /// Output code only
    #[arg(short = 'c', long)]
    pub code: bool,
    /// Include files, directories, or URLs
    #[arg(short = 'f', long, value_name = "FILE|URL", value_hint = ValueHint::AnyPath)]
    pub file: Vec<String>,
    /// Turn off stream mode
    #[arg(short = 'S', long)]
    pub no_stream: bool,
    /// Display the message without sending it
    #[arg(long)]
    pub dry_run: bool,
    /// Display information
    #[arg(long)]
    pub info: bool,
    /// Build all configured Bash tool scripts
    #[arg(long)]
    pub build_tools: bool,
    /// Reinstall bundled assets, overwriting any local changes
    #[arg(long, value_name = "CATEGORY", value_enum)]
    pub install: Option<AssetCategory>,
    /// Install assets from a remote git repository (URL may be suffixed with #<ref>)
    #[arg(long, value_name = "GIT_URL")]
    pub install_from: Option<String>,
    /// Restrict --install-from to a single asset category
    #[arg(long, value_name = "CATEGORY", value_enum, requires = "install_from")]
    pub filter: Option<InstallFilter>,
    /// Overwrite all conflicts without prompting (used with --install-from)
    #[arg(long, requires = "install_from")]
    pub install_force: bool,
    /// Sync models updates
    #[arg(long)]
    pub sync_models: bool,
    /// List all available chat models
    #[arg(long)]
    pub list_models: bool,
    /// List all roles
    #[arg(long)]
    pub list_roles: bool,
    /// List all sessions
    #[arg(long)]
    pub list_sessions: bool,
    /// List all agents
    #[arg(long)]
    pub list_agents: bool,
    /// List all RAGs
    #[arg(long)]
    pub list_rags: bool,
    /// List all macros
    #[arg(long)]
    pub list_macros: bool,
    /// Input text
    #[arg(trailing_var_arg = true)]
    text: Vec<String>,
    /// Tail logs
    #[arg(long)]
    pub tail_logs: bool,
    /// Disable colored log output
    #[arg(long, requires = "tail_logs")]
    pub disable_log_colors: bool,
    /// Add a secret to the Loki vault
    #[arg(long, value_name = "SECRET_NAME", exclusive = true)]
    pub add_secret: Option<String>,
    /// Decrypt a secret from the Loki vault and print the plaintext
    #[arg(long, value_name = "SECRET_NAME", exclusive = true, add = ArgValueCompleter::new(secrets_completer))]
    pub get_secret: Option<String>,
    /// Update an existing secret in the Loki vault
    #[arg(long, value_name = "SECRET_NAME", exclusive = true, add = ArgValueCompleter::new(secrets_completer))]
    pub update_secret: Option<String>,
    /// Delete a secret from the Loki vault
    #[arg(long, value_name = "SECRET_NAME", exclusive = true, add = ArgValueCompleter::new(secrets_completer))]
    pub delete_secret: Option<String>,
    /// List all secrets stored in the Loki vault
    #[arg(long, exclusive = true)]
    pub list_secrets: bool,
    /// Authenticate with an LLM provider using OAuth (e.g., --authenticate client_name)
    #[arg(long, exclusive = true, value_name = "CLIENT_NAME")]
    pub authenticate: Option<Option<String>>,
    /// Generate static shell completion scripts
    #[arg(long, value_name = "SHELL", value_enum)]
    pub completions: Option<ShellCompletion>,
    /// Update Loki to the latest release, or to a specific version
    #[arg(long, value_name = "VERSION")]
    pub update: Option<Option<String>>,
    /// With --update, update even if Loki was installed via a package manager
    #[arg(long, requires = "update")]
    pub force: bool,
}

impl Cli {
    pub fn text(&self) -> Result<Option<String>> {
        let mut stdin_text = String::new();
        if !stdin().is_terminal() {
            let _ = stdin()
                .read_to_string(&mut stdin_text)
                .context("Invalid stdin pipe")?;
        };
        match self.text.is_empty() {
            true => {
                if stdin_text.is_empty() {
                    Ok(None)
                } else {
                    Ok(Some(stdin_text))
                }
            }
            false => {
                if self.macro_name.is_some() {
                    let text = self
                        .text
                        .iter()
                        .map(|v| shell_words::quote(v))
                        .collect::<Vec<_>>()
                        .join(" ");
                    if stdin_text.is_empty() {
                        Ok(Some(text))
                    } else {
                        Ok(Some(format!("{text} -- {stdin_text}")))
                    }
                } else {
                    let text = self.text.join(" ");
                    if stdin_text.is_empty() {
                        Ok(Some(text))
                    } else {
                        Ok(Some(format!("{text}\n{stdin_text}")))
                    }
                }
            }
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use clap::Parser;

    fn parse(args: &[&str]) -> Cli {
        let mut full_args = vec!["loki"];
        full_args.extend_from_slice(args);
        Cli::try_parse_from(full_args).unwrap()
    }

    #[test]
    fn parse_no_args_defaults() {
        let cli = parse(&[]);
        assert!(cli.model.is_none());
        assert!(cli.role.is_none());
        assert!(cli.session.is_none());
        assert!(cli.agent.is_none());
        assert!(!cli.execute);
        assert!(!cli.code);
        assert!(!cli.no_stream);
        assert!(!cli.dry_run);
        assert!(!cli.info);
        assert!(!cli.build_tools);
        assert!(cli.file.is_empty());
        assert!(cli.text.is_empty());
    }

    #[test]
    fn parse_model_flag() {
        let cli = parse(&["--model", "gpt-4o"]);
        assert_eq!(cli.model, Some("gpt-4o".to_string()));
    }

    #[test]
    fn parse_model_short_flag() {
        let cli = parse(&["-m", "gpt-4o"]);
        assert_eq!(cli.model, Some("gpt-4o".to_string()));
    }

    #[test]
    fn parse_role_flag() {
        let cli = parse(&["--role", "coder"]);
        assert_eq!(cli.role, Some("coder".to_string()));
    }

    #[test]
    fn parse_session_with_name() {
        let cli = parse(&["--session", "my-session"]);
        assert_eq!(cli.session, Some(Some("my-session".to_string())));
    }

    #[test]
    fn parse_agent_flag() {
        let cli = parse(&["--agent", "sisyphus"]);
        assert_eq!(cli.agent, Some("sisyphus".to_string()));
    }

    #[test]
    fn parse_agent_short_flag() {
        let cli = parse(&["-a", "sisyphus"]);
        assert_eq!(cli.agent, Some("sisyphus".to_string()));
    }

    #[test]
    fn parse_execute_flag() {
        let cli = parse(&["-e", "list files"]);
        assert!(cli.execute);
    }

    #[test]
    fn parse_code_flag() {
        let cli = parse(&["-c", "hello world"]);
        assert!(cli.code);
    }

    #[test]
    fn parse_no_stream_flag() {
        let cli = parse(&["-S", "test"]);
        assert!(cli.no_stream);
    }

    #[test]
    fn parse_dry_run_flag() {
        let cli = parse(&["--dry-run", "test"]);
        assert!(cli.dry_run);
    }

    #[test]
    fn parse_info_flag() {
        let cli = parse(&["--info"]);
        assert!(cli.info);
    }

    #[test]
    fn parse_list_flags() {
        assert!(parse(&["--list-models"]).list_models);
        assert!(parse(&["--list-roles"]).list_roles);
        assert!(parse(&["--list-sessions"]).list_sessions);
        assert!(parse(&["--list-agents"]).list_agents);
        assert!(parse(&["--list-rags"]).list_rags);
        assert!(parse(&["--list-macros"]).list_macros);
    }

    #[test]
    fn parse_file_flag_single() {
        let cli = parse(&["-f", "file.txt", "question"]);
        assert_eq!(cli.file, vec!["file.txt"]);
    }

    #[test]
    fn parse_file_flag_multiple() {
        let cli = parse(&["-f", "a.txt", "-f", "b.txt", "question"]);
        assert_eq!(cli.file, vec!["a.txt", "b.txt"]);
    }

    #[test]
    fn parse_trailing_text() {
        let cli = parse(&["hello", "world"]);
        assert_eq!(cli.text, vec!["hello", "world"]);
    }

    #[test]
    fn parse_prompt_flag() {
        let cli = parse(&["--prompt", "be a pirate"]);
        assert_eq!(cli.prompt, Some("be a pirate".to_string()));
    }

    #[test]
    fn parse_empty_session_flag() {
        let cli = parse(&["--session", "s", "--empty-session"]);
        assert!(cli.empty_session);
    }

    #[test]
    fn parse_save_session_flag() {
        let cli = parse(&["--session", "s", "--save-session"]);
        assert!(cli.save_session);
    }

    #[test]
    fn parse_build_tools_flag() {
        let cli = parse(&["--build-tools"]);
        assert!(cli.build_tools);
    }

    #[test]
    fn parse_sync_models_flag() {
        let cli = parse(&["--sync-models"]);
        assert!(cli.sync_models);
    }

    #[test]
    fn parse_model_with_role() {
        let cli = parse(&["-m", "gpt-4o", "-r", "coder"]);
        assert_eq!(cli.model, Some("gpt-4o".to_string()));
        assert_eq!(cli.role, Some("coder".to_string()));
    }

    #[test]
    fn parse_agent_with_file_and_text() {
        let cli = parse(&["-a", "sisyphus", "-f", "code.rs", "explain", "this"]);
        assert_eq!(cli.agent, Some("sisyphus".to_string()));
        assert_eq!(cli.file, vec!["code.rs"]);
        assert_eq!(cli.text, vec!["explain", "this"]);
    }

    #[test]
    fn parse_role_with_session() {
        let cli = parse(&["-r", "coder", "-s", "dev-session"]);
        assert_eq!(cli.role, Some("coder".to_string()));
        assert_eq!(cli.session, Some(Some("dev-session".to_string())));
    }

    #[test]
    fn cli_text_returns_none_when_no_text_no_stdin() {
        let cli = parse(&[]);
        assert!(cli.text().unwrap().is_none());
    }

    #[test]
    fn cli_text_joins_trailing_args() {
        let cli = parse(&["hello", "world"]);
        assert_eq!(cli.text().unwrap(), Some("hello world".to_string()));
    }

    #[test]
    fn parse_add_secret_flag() {
        let cli = parse(&["--add-secret", "MY_KEY"]);
        assert_eq!(cli.add_secret, Some("MY_KEY".to_string()));
    }

    #[test]
    fn parse_get_secret_flag() {
        let cli = parse(&["--get-secret", "MY_KEY"]);
        assert_eq!(cli.get_secret, Some("MY_KEY".to_string()));
    }

    #[test]
    fn parse_list_secrets_flag() {
        let cli = parse(&["--list-secrets"]);
        assert!(cli.list_secrets);
    }

    #[test]
    fn parse_rag_flag() {
        let cli = parse(&["--rag", "my-rag"]);
        assert_eq!(cli.rag, Some("my-rag".to_string()));
    }

    #[test]
    fn parse_macro_flag() {
        let cli = parse(&["--macro", "my-macro"]);
        assert_eq!(cli.macro_name, Some("my-macro".to_string()));
    }

    #[test]
    fn parse_update_flag_no_value() {
        let cli = parse(&["--update"]);

        assert_eq!(cli.update, Some(None));
    }

    #[test]
    fn parse_update_flag_with_version() {
        let cli = parse(&["--update", "v0.4.0"]);

        assert_eq!(cli.update, Some(Some("v0.4.0".to_string())));
    }

    #[test]
    fn parse_update_with_force() {
        let cli = parse(&["--update", "--force"]);

        assert_eq!(cli.update, Some(None));
        assert!(cli.force);
    }

    #[test]
    fn parse_force_without_update_fails() {
        assert!(Cli::try_parse_from(["loki", "--force"]).is_err());
    }
}
