zig-core 0.10.0

use std::path::{Path, PathBuf};

use serde::Serialize;

use crate::error::ZigError;
use crate::run::resolve_workflow_path;
use crate::workflow::model::Workflow;
use crate::workflow::parser;

/// Summary information about a discovered workflow file.
#[derive(Debug, Clone, Serialize)]
pub struct WorkflowInfo {
    pub name: String,
    pub description: String,
    pub step_count: usize,
    pub path: String,
    /// `true` when this workflow is a local override of a same-named global workflow.
    #[serde(skip_serializing_if = "std::ops::Not::not")]
    pub is_local: bool,
}

/// Return structured data about all discovered workflows.
///
/// Discovery order:
/// 1. Local project `.zig/workflows/` (walk up to git root)
/// 2. Global `~/.zig/workflows/`
///
/// When a local workflow has the same filename as a global one, the local
/// workflow takes precedence and is marked with `is_local = true`.
pub fn get_workflow_list() -> Result<Vec<WorkflowInfo>, ZigError> {
    let mut local_entries: Vec<PathBuf> = Vec::new();

    if let Some(local_dir) = crate::paths::cwd_workflows_dir() {
        collect_workflow_files(&local_dir, &mut local_entries);
        local_entries.sort();
    }

    // Track which filenames are provided locally so we can detect overrides.
    let local_filenames: Vec<_> = local_entries
        .iter()
        .filter_map(|p| p.file_name().map(|n| n.to_os_string()))
        .collect();

    let mut global_entries: Vec<PathBuf> = Vec::new();
    let mut overridden_filenames: Vec<std::ffi::OsString> = Vec::new();

    if let Some(global_dir) = crate::paths::global_workflows_dir() {
        let mut global_all = Vec::new();
        collect_workflow_files(&global_dir, &mut global_all);
        for f in global_all {
            if local_filenames
                .iter()
                .any(|ln| Some(ln.as_os_str()) == f.file_name())
            {
                overridden_filenames.push(f.file_name().unwrap().to_os_string());
            } else {
                global_entries.push(f);
            }
        }
        global_entries.sort();
    }

    let mut infos = Vec::new();

    for path in &local_entries {
        let display = crate::paths::collapse_home(&path.display().to_string());
        let is_override = path
            .file_name()
            .is_some_and(|n| overridden_filenames.iter().any(|o| o == n));
        match parser::parse_file(path) {
            Ok(wf) => {
                infos.push(WorkflowInfo {
                    name: wf.workflow.name,
                    description: wf.workflow.description,
                    step_count: wf.steps.len(),
                    path: display,
                    is_local: is_override,
                });
            }
            Err(_) => {
                infos.push(WorkflowInfo {
                    name: "(parse error)".to_string(),
                    description: String::new(),
                    step_count: 0,
                    path: display,
                    is_local: is_override,
                });
            }
        }
    }

    for path in &global_entries {
        let display = crate::paths::collapse_home(&path.display().to_string());
        match parser::parse_file(path) {
            Ok(wf) => {
                infos.push(WorkflowInfo {
                    name: wf.workflow.name,
                    description: wf.workflow.description,
                    step_count: wf.steps.len(),
                    path: display,
                    is_local: false,
                });
            }
            Err(_) => {
                infos.push(WorkflowInfo {
                    name: "(parse error)".to_string(),
                    description: String::new(),
                    step_count: 0,
                    path: display,
                    is_local: false,
                });
            }
        }
    }

    Ok(infos)
}

/// Return the parsed workflow for a given workflow name or path.
pub fn get_workflow_detail(workflow: &str) -> Result<Workflow, ZigError> {
    let path = resolve_workflow_path(workflow)?;
    parser::parse_file(&path)
}

/// List all `.zwf`/`.zwfz` workflow files found in the current directory,
/// `./workflows/`, and the global `~/.zig/workflows/` directory.
pub fn list_workflows() -> Result<(), ZigError> {
    let infos = get_workflow_list()?;

    if infos.is_empty() {
        println!("No workflows found.");
        println!("Hint: create one with `zig workflow create <name>`");
        return Ok(());
    }

    // Determine terminal width, default to 100 if unavailable.
    let term_width = terminal_width().unwrap_or(100);

    let name_w = infos
        .iter()
        .map(|r| {
            if r.is_local {
                r.name.len() + 2
            } else {
                r.name.len()
            }
        })
        .max()
        .unwrap_or(0)
        .max(4);
    let steps_w = infos
        .iter()
        .map(|r| format_steps(r.step_count).len())
        .max()
        .unwrap_or(0)
        .max(5);

    // Reserve space for name, steps, separators, and a minimum path column,
    // then give the rest to description.
    let fixed = name_w + steps_w + 8; // 3 x 2-char gaps + 2 for padding
    let desc_w = if term_width > fixed + 20 {
        term_width - fixed - 20
    } else {
        30
    };
    let desc_w = desc_w.max(11);

    println!(
        "\x1b[1m{:<name_w$}\x1b[0m  {:<desc_w$}  {:<steps_w$}  PATH",
        "NAME", "DESCRIPTION", "STEPS"
    );
    println!(
        "{}  {}  {}  {}",
        "─".repeat(name_w),
        "─".repeat(desc_w),
        "─".repeat(steps_w),
        "─".repeat(4)
    );
    let has_overrides = infos.iter().any(|i| i.is_local);

    for info in &infos {
        let desc = truncate(&info.description, desc_w);
        let steps = format_steps(info.step_count);
        let name_display = if info.is_local {
            format!("{} *", info.name)
        } else {
            info.name.clone()
        };
        println!(
            "\x1b[1m{:<name_w$}\x1b[0m  {:<desc_w$}  {:<steps_w$}  {}",
            name_display, desc, steps, info.path
        );
    }

    if has_overrides {
        println!("\n* local override");
    }

    Ok(())
}

/// Show detailed information about a workflow.
pub fn show_workflow(workflow: &str) -> Result<(), ZigError> {
    let path = resolve_workflow_path(workflow)?;
    let wf = parser::parse_file(&path)?;

    println!("Name:        {}", wf.workflow.name);
    println!("Path:        {}", path.display());
    if !wf.workflow.description.is_empty() {
        println!("Description: {}", wf.workflow.description);
    }
    if !wf.workflow.tags.is_empty() {
        println!("Tags:        {}", wf.workflow.tags.join(", "));
    }
    if let Some(ref version) = wf.workflow.version {
        println!("Version:     {version}");
    }
    if let Some(ref provider) = wf.workflow.provider {
        print!("Provider:    {provider}");
        if let Some(ref model) = wf.workflow.model {
            print!(" / {model}");
        }
        println!();
    } else if let Some(ref model) = wf.workflow.model {
        println!("Model:       {model}");
    }

    if !wf.vars.is_empty() {
        println!("\nVariables:");
        let mut vars: Vec<_> = wf.vars.iter().collect();
        vars.sort_by_key(|(name, _)| (*name).clone());
        for (name, var) in &vars {
            let default = match &var.default {
                Some(v) => format!(" = {v}"),
                None => String::new(),
            };
            println!("  {name}: {}{default}", var.var_type);
            if !var.description.is_empty() {
                println!("    {}", var.description);
            }
        }
    }

    if !wf.steps.is_empty() {
        println!("\nSteps ({}):", wf.steps.len());
        for (i, step) in wf.steps.iter().enumerate() {
            print!("  {}. {}", i + 1, step.name);
            if !step.depends_on.is_empty() {
                print!(" (depends on: {})", step.depends_on.join(", "));
            }
            println!();
            if !step.description.is_empty() {
                println!("     {}", step.description);
            }
            if let Some(condition) = &step.condition {
                println!("     condition: {condition}");
            }
            if let Some(provider) = &step.provider {
                print!("     provider: {provider}");
                if let Some(model) = &step.model {
                    print!(" / {model}");
                }
                println!();
            } else if let Some(model) = &step.model {
                println!("     model: {model}");
            }
        }
    }

    Ok(())
}

/// Delete a workflow file.
pub fn delete_workflow(workflow: &str) -> Result<(), ZigError> {
    let path = resolve_workflow_path(workflow)?;
    std::fs::remove_file(&path)
        .map_err(|e| ZigError::Io(format!("failed to delete {}: {e}", path.display())))?;
    println!("deleted {}", path.display());
    Ok(())
}

/// Truncate a string to `max` characters, appending "…" if truncated.
fn truncate(s: &str, max: usize) -> String {
    if s.len() <= max {
        s.to_string()
    } else if max <= 1 {
        "…".to_string()
    } else {
        format!("{}…", &s[..max - 1])
    }
}

/// Format step count concisely.
fn format_steps(count: usize) -> String {
    if count == 1 {
        "1 step".to_string()
    } else {
        format!("{count} steps")
    }
}

/// Try to detect terminal width from the COLUMNS environment variable.
fn terminal_width() -> Option<usize> {
    std::env::var("COLUMNS").ok().and_then(|v| v.parse().ok())
}

/// Discover all `.zwf`/`.zwfz` files in a base directory and its `workflows/`
/// subdirectory.
#[cfg(test)]
fn discover_workflow_files(base: &Path) -> Vec<PathBuf> {
    let mut files = Vec::new();

    collect_workflow_files(base, &mut files);
    collect_workflow_files(&base.join("workflows"), &mut files);

    files.sort();
    files
}

/// Collect `.zwf` and `.zwfz` workflow files from a single directory into `out`.
fn collect_workflow_files(dir: &Path, out: &mut Vec<PathBuf>) {
    if let Ok(entries) = std::fs::read_dir(dir) {
        for entry in entries.flatten() {
            let path = entry.path();
            if path
                .extension()
                .is_some_and(|ext| ext == "zwf" || ext == "zwfz")
                && path.is_file()
            {
                out.push(path);
            }
        }
    }
}

#[cfg(test)]
#[path = "manage_tests.rs"]
mod tests;