pyflow 0.3.1

use crate::{
    dep_types::{Req, Version},
    util, Config,
};
use regex::Regex;
use serde::Deserialize;
use std::collections::HashMap;
use std::fs;
use std::io::{BufRead, BufReader};
use std::path::Path;
use termcolor::Color;

#[derive(Debug, Deserialize)]
pub struct Pipfile {
    // Pipfile doesn't use a prefix; assume `[packages]` and [`dev-packages`] sections
    // are from it, and use the same format as this tool and `Poetry`.
    pub packages: Option<HashMap<String, DepComponentWrapper>>,
    #[serde(rename = "dev-packages")]
    pub dev_packages: Option<HashMap<String, DepComponentWrapper>>,
}

/// This nested structure is required based on how the `toml` crate handles dots.
#[derive(Debug, Deserialize)]
pub struct Pyproject {
    pub tool: Tool,
}

#[derive(Debug, Deserialize)]
pub struct Tool {
    pub pyflow: Option<Pyflow>,
    pub poetry: Option<Poetry>,
}

#[derive(Debug, Deserialize)]
#[serde(untagged)]
/// Allows use of both Strings, ie "ipython = "^7.7.0", and maps: "ipython = {version = "^7.7.0", extras=["qtconsole"]}"
pub enum DepComponentWrapper {
    A(String),
    B(DepComponent),
}

#[derive(Debug, Deserialize)]
#[serde(untagged)]
pub enum DepComponentWrapperPoetry {
    A(String),
    B(DepComponentPoetry),
}

#[derive(Debug, Deserialize)]
pub struct DepComponent {
    #[serde(rename = "version")]
    pub constrs: Option<String>,
    pub extras: Option<Vec<String>>,
    pub path: Option<String>,
    pub git: Option<String>,
    pub branch: Option<String>,
    pub service: Option<String>,
    pub python: Option<String>,
}

#[derive(Debug, Deserialize)]
pub struct DepComponentPoetry {
    #[serde(rename = "version")]
    pub constrs: String,
    pub python: Option<String>,
    pub extras: Option<Vec<String>>,
    pub optional: Option<bool>,
    // todo: more fields
    //    pub repository: Option<String>,
    //    pub branch: Option<String>,
    //    pub service: Option<String>,
}

#[derive(Debug, Deserialize)]
pub struct Pyflow {
    pub py_version: Option<String>,
    pub name: Option<String>,
    pub version: Option<String>,
    pub authors: Option<Vec<String>>,
    pub license: Option<String>,
    pub description: Option<String>,
    pub classifiers: Option<Vec<String>>, // https://pypi.org/classifiers/
    pub keywords: Option<Vec<String>>,
    pub homepage: Option<String>,
    pub repository: Option<String>,
    pub repo_url: Option<String>,
    pub package_url: Option<String>,
    pub readme: Option<String>,
    pub build: Option<String>,
    //    pub entry_points: Option<HashMap<String, Vec<String>>>,
    pub scripts: Option<HashMap<String, String>>,
    pub python_requires: Option<String>,
    pub dependencies: Option<HashMap<String, DepComponentWrapper>>,
    #[serde(rename = "dev-dependencies")]
    pub dev_dependencies: Option<HashMap<String, DepComponentWrapper>>,
    pub extras: Option<HashMap<String, String>>,
}

#[derive(Debug, Deserialize)]
pub struct Poetry {
    pub name: Option<String>,
    pub version: Option<String>,
    pub description: Option<String>,
    pub license: Option<String>,
    pub authors: Option<Vec<String>>,
    pub homepage: Option<String>,
    pub repository: Option<String>,
    pub documentation: Option<String>,
    pub keywords: Option<Vec<String>>,
    pub readme: Option<String>,
    pub build: Option<String>,
    pub classifiers: Option<Vec<String>>,
    pub packages: Option<Vec<HashMap<String, String>>>,
    pub include: Option<Vec<String>>,
    pub exclude: Option<Vec<String>>,
    pub extras: Option<HashMap<String, String>>,

    pub dependencies: Option<HashMap<String, DepComponentWrapperPoetry>>,
    pub dev_dependencies: Option<HashMap<String, DepComponentWrapperPoetry>>,
    // todo: Include these
    //    pub source: Option<HashMap<String, String>>,
    pub scripts: Option<HashMap<String, String>>,
    //    pub extras: Option<HashMap<String, String>>,
}

/// Split from `add_reqs_to_cfg` to accomodate testing
fn update_cfg(cfg_data: &str, added: &[Req], added_dev: &[Req]) -> String {
    let mut result = String::new();
    let mut in_dep = false;
    let mut in_dev_dep = false;
    let sect_re = Regex::new(r"^\[.*\]$").unwrap();

    // We collect lines here so we can start the index at a non-0 point.
    let lines_vec: Vec<&str> = cfg_data.lines().collect();

    // todo: Lots of DRY between dep and dev dep
    let mut dep_start = 0;
    let mut dev_dep_start = 0;
    let mut dep_end = 0;
    let mut dev_dep_end = 0;

    for (i, line) in cfg_data.lines().enumerate() {
        if &line.replace(" ", "") == "[tool.pyflow.dependencies]" {
            dep_start = i + 1;
            if in_dev_dep {
                dev_dep_end = i - 1;
            }
            in_dep = true;
            in_dev_dep = false;
            continue; // Continue so this line doesn't trigger the section's end.
        }

        if &line.replace(" ", "") == "[tool.pyflow.dev-dependencies]" {
            dev_dep_start = i + 1;
            if in_dep {
                dep_end = i - 1;
            }
            in_dep = false;
            in_dev_dep = true;
            continue;
        }

        // We've found the end of the dependencies section.
        if in_dep && (sect_re.is_match(line) || i == lines_vec.len() - 1) {
            in_dep = false;
            dep_end = i - 1;
        }

        if in_dev_dep && (sect_re.is_match(line) || i == lines_vec.len() - 1) {
            in_dev_dep = false;
            dev_dep_end = i - 1;
        }
    }

    let mut insertion_pt = dep_start;
    if dep_start != 0 {
        #[allow(clippy::needless_range_loop)]
        for i in dep_start..=dep_end {
            let line = lines_vec[i];
            if !line.is_empty() {
                insertion_pt = i + 1
            }
        }
    }

    let mut dev_insertion_pt = dev_dep_start;
    if dev_dep_start != 0 {
        #[allow(clippy::needless_range_loop)]
        for i in dev_dep_start..=dev_dep_end {
            let line = lines_vec[i];
            if !line.is_empty() {
                dev_insertion_pt = i + 1
            }
        }
    }

    for (i, line) in cfg_data.lines().enumerate() {
        if i == insertion_pt && dep_start != 0 {
            for req in added {
                result.push_str(&req.to_cfg_string());
                result.push('\n');
            }
        }
        if i == dev_insertion_pt && dev_dep_start != 0 {
            for req in added_dev {
                result.push_str(&req.to_cfg_string());
                result.push('\n');
            }
        }
        result.push_str(line);
        result.push('\n');
    }

    // If the sections don't exist, create them.
    // todo: Adjust start pad as needed so there's exactly two blank lines before adding the section.
    if dep_start == 0 {
        // todo: Should add dependencies section before dev deps section.
        result.push_str("[tool.pyflow.dependencies]\n");
        for req in added {
            result.push_str(&req.to_cfg_string());
            result.push('\n');
        }
        result.push('\n');
    }

    if dev_dep_start == 0 {
        result.push_str("[tool.pyflow.dev-dependencies]\n");
        for req in added_dev {
            result.push_str(&req.to_cfg_string());
            result.push('\n');
        }
        result.push('\n');
    }

    result
}

/// Write dependencies to pyproject.toml. If an entry for that package already exists, ask if
/// we should update the version. Assume we've already parsed the config, and are only
/// adding new reqs, or ones with a changed version.
pub fn add_reqs_to_cfg(cfg_path: &Path, added: &[Req], added_dev: &[Req]) {
    let data = fs::read_to_string(cfg_path)
        .expect("Unable to read pyproject.toml while attempting to add a dependency");

    let updated = update_cfg(&data, added, added_dev);
    fs::write(cfg_path, updated)
        .expect("Unable to write pyproject.toml while attempting to add a dependency");
}

/// Remove dependencies from pyproject.toml.
pub fn remove_reqs_from_cfg(cfg_path: &Path, reqs: &[String]) {
    // todo: Handle removing dev deps.
    // todo: DRY from parsing the config.
    let mut result = String::new();
    let data = fs::read_to_string(cfg_path)
        .expect("Unable to read pyproject.toml while attempting to add a dependency");

    let mut in_dep = false;
    let mut _in_dev_dep = false;
    let sect_re = Regex::new(r"^\[.*\]$").unwrap();

    for line in data.lines() {
        if line.starts_with('#') || line.is_empty() {
            // todo handle mid-line comements
            result.push_str(line);
            result.push('\n');
            continue;
        }

        if line == "[tool.pyflow.dependencies]" {
            in_dep = true;
            _in_dev_dep = false;
            result.push_str(line);
            result.push('\n');
            continue;
        }

        if line == "[tool.pyflow.dev-dependencies]" {
            in_dep = true;
            _in_dev_dep = false;
            result.push_str(line);
            result.push('\n');
            continue;
        }

        if in_dep {
            if sect_re.is_match(line) {
                in_dep = false;
            }
            // todo: handle comments
            let req_line = if let Ok(r) = Req::from_str(line, false) {
                r
            } else {
                result.push_str(line);
                result.push('\n');
                continue; // Could be caused by a git etc req.
                          //                util::abort(&format!(
                          //                    "Can't parse this line in `pyproject.toml`: {}",
                          //                    line
                          //                ));
                          //                unreachable!()
            };

            if reqs
                .iter()
                .map(|r| r.to_lowercase())
                .any(|x| x == req_line.name.to_lowercase())
            {
                continue; // ie don't append this line to result.
            }
        }
        result.push_str(line);
        result.push('\n');
    }

    fs::write(cfg_path, result)
        .expect("Unable to write to pyproject.toml while attempting to add a dependency");
}

pub fn parse_req_dot_text(cfg: &mut Config, path: &Path) {
    let file = match fs::File::open(path) {
        Ok(f) => f,
        Err(_) => return,
    };

    for line in BufReader::new(file).lines().flatten() {
        match Req::from_pip_str(&line) {
            Some(r) => {
                cfg.reqs.push(r.clone());
            }
            None => util::print_color(
                &format!("Problem parsing {} from requirements.txt", line),
                Color::Red,
            ),
        };
    }
}

/// Update the config file with a new version.
pub fn change_py_vers(cfg_path: &Path, specified: &Version) {
    let f = fs::File::open(&cfg_path)
        .expect("Unable to read pyproject.toml while adding Python version");
    let mut new_data = String::new();
    for line in BufReader::new(f).lines().flatten() {
        if line.starts_with("py_version") {
            new_data.push_str(&format!("py_version = \"{}\"\n", specified.to_string()));
        } else {
            new_data.push_str(&line);
            new_data.push('\n');
        }
    }

    fs::write(cfg_path, new_data)
        .expect("Unable to write pyproject.toml while adding Python version");
}

#[cfg(test)]
pub mod tests {
    use super::*;
    use crate::dep_types::{Constraint, ReqType::Caret};

    // We're not concerned with testing formatting in this func.
    fn base_constrs() -> Vec<Constraint> {
        vec![Constraint::new(Caret, Version::new(0, 0, 1))]
    }

    const BASELINE: &str = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
a = "^0.3.5"

[tool.pyflow.dev-dependencies]
dev_a = "^1.17.2"

"#;

    const _BASELINE_NO_DEPS: &str = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dev-dependencies]
dev_a = "^1.17.2"

"#;

    const BASELINE_NO_DEV_DEPS: &str = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
a = "^0.3.5"

"#;

    const BASELINE_NO_DEPS_NO_DEV_DEPS: &str = r#"
[tool.pyflow]
name = ""

"#;

    const BASELINE_EMPTY_DEPS: &str = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]

[tool.pyflow.dev-dependencies]
dev_a = "^1.17.2"

"#;

    #[test]
    fn add_deps_baseline() {
        let actual = update_cfg(
            BASELINE.into(),
            &[
                Req::new("b".into(), base_constrs()),
                Req::new("c".into(), base_constrs()),
            ],
            &[Req::new("dev_b".into(), base_constrs())],
        );

        let expected = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
a = "^0.3.5"
b = "^0.0.1"
c = "^0.0.1"

[tool.pyflow.dev-dependencies]
dev_a = "^1.17.2"
dev_b = "^0.0.1"

"#;

        assert_eq!(expected, &actual);
    }

    #[test]
    fn add_deps_no_dev_deps_sect() {
        let actual = update_cfg(
            BASELINE_NO_DEV_DEPS.into(),
            &[
                Req::new("b".into(), base_constrs()),
                Req::new("c".into(), base_constrs()),
            ],
            &[Req::new("dev_b".into(), base_constrs())],
        );

        let expected = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
a = "^0.3.5"
b = "^0.0.1"
c = "^0.0.1"

[tool.pyflow.dev-dependencies]
dev_b = "^0.0.1"

"#;

        assert_eq!(expected, &actual);
    }

    #[test]
    fn add_deps_baseline_empty_deps() {
        let actual = update_cfg(
            BASELINE_EMPTY_DEPS.into(),
            &[
                Req::new("b".into(), base_constrs()),
                Req::new("c".into(), base_constrs()),
            ],
            &[Req::new("dev_b".into(), base_constrs())],
        );

        let expected = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
b = "^0.0.1"
c = "^0.0.1"

[tool.pyflow.dev-dependencies]
dev_a = "^1.17.2"
dev_b = "^0.0.1"

"#;

        assert_eq!(expected, &actual);
    }

    #[test]
    fn add_deps_dev_deps_baseline_no_deps_dev_deps() {
        let actual = update_cfg(
            BASELINE_NO_DEPS_NO_DEV_DEPS.into(),
            &[
                Req::new("b".into(), base_constrs()),
                Req::new("c".into(), base_constrs()),
            ],
            &[Req::new("dev_b".into(), base_constrs())],
        );

        let expected = r#"
[tool.pyflow]
name = ""

[tool.pyflow.dependencies]
b = "^0.0.1"
c = "^0.0.1"

[tool.pyflow.dev-dependencies]
dev_b = "^0.0.1"

"#;
        assert_eq!(expected, &actual);
    }
}