use toml_edit::{value, Array, Document};

use ansi_term::*;
use std::collections::HashMap;
use std::fs::{read_to_string, OpenOptions};
use std::io::Write;
use std::process::exit;





/// The heart of your spec
pub struct Program {
    name: &'static str,
    authors: Array,
    dependencies: HashMap<&'static str, &'static str>,
    version: &'static str,
    edition: &'static str,
    readme: Option<&'static str>,
    repo: Option<&'static str>,
    docs: Option<&'static str>,
    desc: Option<&'static str>,

    license: &'static str,
}




impl Program {
    /// Adds a license
    ///
    /// Required but defaults to **MIT**
    pub fn license(mut self, license: &'static str) -> Self {
        info("License is...");
        info(license);
        self.license = license;
        self
    }

    /// Creates a new program struct.
    ///
    ///
    pub fn new() -> Program {
        Program {
            // 0000 means required value not set
            // blank means optional
            name: "placeholder name",
            authors: Array::default(),
            version: "plaeceholder",
            edition: "2021",
            dependencies: HashMap::new(),
            readme: None,
            repo: None,
            docs: None,
            desc: None,

            license: "MIT",
        }
    }



    /// Adds a readme path
    ///
    /// **OPTIONAL**
    pub fn readme(mut self, readmepath: &'static str) -> Self {
        self.readme = Some(readmepath);
        info("Readme path is...");
        info(readmepath);
        self
    }
    /// Adds a documentation path
    ///
    /// **OPTIONAL**
    pub fn docs(mut self, docspath: &'static str) -> Self {
        self.docs = Some(docspath);
        info("Docs path is...");
        info(docspath);
        self
    }
    /// Adds a readme path
    ///
    /// **OPTIONAL**
    pub fn description(mut self, description: &'static str) -> Self {
        self.desc = Some(description);
        info("Description  is...");
        info(description);
        self
    }

    /// Edition
    ///
    /// Specifies the rust **edition**
    /// It is required but defaults to rust 2018
    pub fn edition(mut self, editon: &'static str) -> Self {
        info("With Edition");
        info(editon);
        self.edition = editon;
        self
    }

    /// Adds an author
    ///
    /// **It is required**
    pub fn author(mut self, author: &'static str) -> Self {
        info("Author name is");
        info(author);
        self.authors.push(author);
        self
    }
    /// Sets the version
    ///
    /// **It is required**
    pub fn version(mut self, version: &'static str) -> Self {
        info("Package Version is");
        info(version);
        self.version = version;
        self
    }
    /// Checks the package for invalid config
    pub fn check(&self) {
        if self.name == "placeholder name"
            || self.authors.is_empty()
            || self.version == "placeholder"
        {
            error(" Missing required fields. Name, Author and Version are required in spec.rs");
        }
    }

    /// Sets the repository
    /// Optional

    pub fn repo(mut self, repopath: &'static str) -> Self {
        info("With repository...");
        info(repopath);
        self.repo = Some(repopath);
        self
    }

    /// Adds a name propety under  the package section
    ///
    /// Names are **required**
    pub fn name(mut self, name: &'static str) -> Self {
        info("Package name is");
        info(name);
        self.name = name;

        self
    }
    /// Adds a dependency
    pub fn dependencie(mut self, name: &'static str, version: &'static str) -> Self {
        info("Dependencie");
        info(name);
        info("With version");
        info(version);
        self.dependencies.insert(name, version);
        self
    }
    /// Generates cargo toml.
    ///
    /// __Also runs the `check` function__
    pub fn gen(self) {
        good("Generating....");
        self.check();
        let cargo_toml = read_to_string("Cargo.toml");
        if let Result::Ok(cargo_toml) = cargo_toml {
            let cargo_toml_doc = cargo_toml.parse::<Document>();
            if let Ok(mut tomlspec) = cargo_toml_doc {
                tomlspec["package"]["name"] = value(self.name);
                tomlspec["package"]["authors"] = value(self.authors);
                tomlspec["package"]["version"] = value(self.version);
                tomlspec["package"]["edition"] = value(self.edition);
                tomlspec["package"]["license"] = value(self.license);
                // ------Depednecies-----

                for dep in self.dependencies {
                    tomlspec["dependencies"][dep.0] = value(dep.1)
                }

                // Optional fields-
                if let Some(readmepath) = self.readme {
                    tomlspec["package"]["readme"] = value(readmepath);
                }
                if let Some(repo) = self.repo {
                    tomlspec["package"]["repository"] = value(repo);
                }
                if let Some(desc) = self.desc {
                    tomlspec["package"]["description"] = value(desc);
                }
                if let Some(docs) = self.docs {
                    tomlspec["package"]["documentation"] = value(docs);
                }
                let mut cargo_file = OpenOptions::new().write(true).open("Cargo.toml")
                .expect("Fatal error. Cargo toml not found. This is probably a bug. Please report it on github.");
                cargo_file
                    .write(tomlspec.to_string().as_bytes())
                    .expect("Cargo.toml erorr");
            }
        } else {
            error(" Previous Cargo.toml is invalid. Run cargo check to see the mistakes")
        }
    }
}

#[cfg(debug_assertions)]
fn warn(reason: &str) {
    eprintln!(
        "{} : {}",
        ansi_term::Color::Yellow.bold().paint("WARNING"),
        Color::Cyan.paint(reason)
    );
}
fn info(reason: &str) {
    eprintln!(
        "{} {}",
        ansi_term::Color::Blue.bold().paint("Info:"),
        Color::Cyan.paint(reason)
    );
}
fn good(reason: &str) {
    eprintln!(
        "{} {}",
        ansi_term::Color::Green.bold().paint("Good news!"),
        Color::Cyan.paint(reason)
    );
}
fn error(reason: &str) {
    eprintln!(
        "{}: {}",
        ansi_term::Color::Red
            .bold()
            .paint("Whoops an error has occured"),
        Color::Cyan.paint(reason)
    );
    exit(1);
}