use anyhow::Result;
use colored::Colorize;

pub fn init_project(root: &str, out: &str) -> Result<()> {
    println!("{}", "Initializing archdoc project...".cyan().bold());

    let out_path = std::path::Path::new(out);
    std::fs::create_dir_all(out_path)?;
    std::fs::create_dir_all(out_path.join("modules"))?;
    std::fs::create_dir_all(out_path.join("files"))?;

    let layout_md_path = out_path.join("layout.md");
    let layout_md_content = r#"# Repository layout

<!-- MANUAL:BEGIN -->
## Manual overrides
- `src/app/` — <FILL_MANUALLY>
<!-- MANUAL:END -->

---

## Detected structure
<!-- ARCHDOC:BEGIN section=layout_detected -->
> Generated. Do not edit inside this block.
<!-- ARCHDOC:END section=layout_detected -->
"#;
    std::fs::write(&layout_md_path, layout_md_content)?;

    let architecture_md_content = r#"# ARCHITECTURE — <PROJECT_NAME>

<!-- MANUAL:BEGIN -->
## Project summary
**Name:** <PROJECT_NAME>
**Description:** <FILL_MANUALLY: what this project does in 3–7 lines>

## Key decisions (manual)
- <FILL_MANUALLY>

## Non-goals (manual)
- <FILL_MANUALLY>
<!-- MANUAL:END -->

---

## Document metadata
- **Created:** <AUTO_ON_INIT: YYYY-MM-DD>
- **Updated:** <AUTO_ON_CHANGE: YYYY-MM-DD>
- **Generated by:** archdoc (cli) v0.1

---

## Rails / Tooling
<!-- ARCHDOC:BEGIN section=rails -->
> Generated. Do not edit inside this block.
<AUTO: rails summary + links to config files>
<!-- ARCHDOC:END section=rails -->

---

## Repository layout (top-level)
<!-- ARCHDOC:BEGIN section=layout -->
> Generated. Do not edit inside this block.
<AUTO: table of top-level folders + heuristic purpose + link to layout.md>
<!-- ARCHDOC:END section=layout -->

---

## Modules index
<!-- ARCHDOC:BEGIN section=modules_index -->
> Generated. Do not edit inside this block.
<AUTO: table modules + deps counts + links to module docs>
<!-- ARCHDOC:END section=modules_index -->

---

## Critical dependency points
<!-- ARCHDOC:BEGIN section=critical_points -->
> Generated. Do not edit inside this block.
<AUTO: top fan-in/out symbols + cycles>
<!-- ARCHDOC:END section=critical_points -->

---

<!-- MANUAL:BEGIN -->
## Change notes (manual)
- <FILL_MANUALLY>
<!-- MANUAL:END -->
"#;

    let architecture_md_path = std::path::Path::new(root).join("ARCHITECTURE.md");
    std::fs::write(&architecture_md_path, architecture_md_content)?;

    let config_toml_content = r#"[project]
root = "."
out_dir = "docs/architecture"
entry_file = "ARCHITECTURE.md"
language = "python"

[scan]
include = ["src", "app", "tests"]
exclude = [
    ".venv", "venv", "__pycache__", ".git", "dist", "build",
    ".mypy_cache", ".ruff_cache", ".pytest_cache", "*.egg-info"
]
follow_symlinks = false
max_file_size = "10MB"

[python]
src_roots = ["src", "."]
include_tests = true
parse_docstrings = true
max_parse_errors = 10

[analysis]
resolve_calls = true
resolve_inheritance = false
detect_integrations = true
integration_patterns = [
    { type = "http", patterns = ["requests", "httpx", "aiohttp"] },
    { type = "db", patterns = ["sqlalchemy", "psycopg", "mysql", "sqlite3"] },
    { type = "queue", patterns = ["celery", "kafka", "pika", "redis"] }
]

[output]
single_file = false
per_file_docs = true
create_directories = true
overwrite_manual_sections = false

[diff]
update_timestamp_on_change_only = true
hash_algorithm = "sha256"
preserve_manual_content = true

[thresholds]
critical_fan_in = 20
critical_fan_out = 20
high_complexity = 50

[rendering]
template_engine = "handlebars"
max_table_rows = 100
truncate_long_descriptions = true
description_max_length = 200

[logging]
level = "info"
file = "archdoc.log"
format = "compact"

[caching]
enabled = true
cache_dir = ".archdoc/cache"
max_cache_age = "24h"
"#;

    let config_toml_path = std::path::Path::new(root).join("archdoc.toml");
    if !config_toml_path.exists() {
        std::fs::write(&config_toml_path, config_toml_content)?;
    }

    println!("{} Project initialized!", "✓".green().bold());
    println!("  {} {}", "→".dimmed(), architecture_md_path.display());
    println!("  {} {}", "→".dimmed(), config_toml_path.display());
    println!("  {} {} (directory)", "→".dimmed(), out_path.display());

    Ok(())
}