use crate::args::{HazeCommand, SubCommand};
use crate::database::DatabaseFamily;
use crate::php::PhpVersion;
use crate::service::ServiceType;
use owo_colors::colors::xterm::Gray;
use owo_colors::OwoColorize;
use strum::{EnumMessage, EnumProperty, IntoEnumIterator};

pub fn help(command: Option<&dyn SubCommand>) {
    if let Some(command) = command {
        subcommand_help(command);
    } else {
        println!(
            "{} {} {}",
            "Usage:".bright_yellow().bold(),
            "haze".blue(),
            "[filter] <COMMAND> [arguments]".green()
        );
        println!();
        println!("{}", "Commands:".yellow().bold());
        let max_command_len = HazeCommand::iter()
            .map(|command| <&'static str>::from(command).len())
            .max()
            .unwrap();
        let max_doc_len = HazeCommand::iter()
            .map(|command| {
                command
                    .get_documentation()
                    .unwrap_or_default()
                    .split('\n')
                    .next()
                    .unwrap()
                    .len()
            })
            .max()
            .unwrap();

        for command in HazeCommand::iter() {
            let command: HazeCommand = command;
            let command_str = <&'static str>::from(command);
            let mut len = command_str.len();
            if command_str.starts_with("--") {
                len -= 2;
            }
            let doc: &str = command.get_documentation().unwrap_or_default();
            let doc = doc.split('\n').next().unwrap();
            println!(
                "  {}{}  {}{} {}",
                command.blue(),
                " ".repeat(max_command_len - len),
                doc,
                " ".repeat(max_doc_len - doc.len()),
                if command.allows_filter() {
                    "- supports filter".fg::<Gray>()
                } else {
                    "".fg::<Gray>()
                },
            );
        }
        println!();
        println!(
            "See {} {} for more information about a {}",
            "haze help".blue(),
            "<COMMAND>".green(),
            "<COMMAND>".green()
        );
    }
}

fn subcommand_help(command: &dyn SubCommand) {
    println!("{}", command.get_documentation().unwrap_or_default());
    println!();
    print!(
        "{} {}{}{} {}",
        "Usage:".bright_yellow().bold(),
        "haze".blue(),
        if command.allows_filter() {
            " [filter]".green()
        } else {
            "".green()
        },
        command.parent().blue(),
        command.blue(),
    );

    let instance_args = command.get_bool("InstanceArgs").unwrap_or_default();
    if instance_args {
        print!(" {}", "[php version]".green());
        print!(" {}", "[database type]".green());
        print!(" {}", "[services]".green());
        print!(" {}", "[vX.Y.Z]".green());
    }

    let args = if let Some(args) = command.get_str("Args") {
        let args: &str = args;
        print!(" {}", "[arguments]".green());
        args.strip_prefix("[")
            .unwrap_or(args)
            .split(" [")
            .filter_map(|arg| arg.split_once("] "))
            .collect::<Vec<_>>()
    } else {
        vec![]
    };
    println!();

    println!();
    if instance_args {
        println!("{}", "Php versions:".yellow().bold());
        for php in PhpVersion::supported_versions() {
            println!("  {}", php.blue());
        }
        println!();

        println!("{}", "Database types:".yellow().bold());
        let max_db_len = DatabaseFamily::iter()
            .map(|service| service.to_string().len())
            .max()
            .unwrap_or_default();

        for db in DatabaseFamily::iter() {
            let db: DatabaseFamily = db;
            let db_str: &'static str = db.into();
            let versions = match db.get_str("Versions") {
                Some(versions) => {
                    let versions: Vec<_> = versions
                        .split(' ')
                        .map(|version| format!("{}{}{}", db.blue(), ":".blue(), version.blue()))
                        .collect();
                    Some(versions.join(", "))
                }
                None => None,
            };

            print!("  {}{}  ", db.blue(), " ".repeat(max_db_len - db_str.len()));
            if let Some(versions) = versions {
                println!("supported versions: {versions}");
            } else {
                println!();
            }
        }
        println!();

        println!("{}", "Services:".yellow().bold());
        let max_service_len = ServiceType::iter()
            .map(|service| service.to_string().len())
            .max()
            .unwrap_or_default();
        for service in ServiceType::iter() {
            let service: ServiceType = service;
            let service_str: &'static str = service.into();
            println!(
                "  {}{}  {}",
                service.blue(),
                " ".repeat(max_service_len - service_str.len()),
                service.get_documentation().unwrap_or_default(),
            );
        }
    }

    if let Some(sub_commands) = command.sub_commands() {
        println!();
        println!("{}", "Commands:".yellow().bold());
        let max_command_len = command
            .sub_commands()
            .unwrap()
            .map(|sub_command| sub_command.to_string().len())
            .max()
            .unwrap();
        let max_doc_len = command
            .sub_commands()
            .unwrap()
            .map(|sub_command| {
                sub_command
                    .get_documentation()
                    .unwrap_or_default()
                    .split('\n')
                    .next()
                    .unwrap()
                    .len()
            })
            .max()
            .unwrap();

        for sub_command in sub_commands {
            let command_str = sub_command.to_string();
            let mut len = command_str.len();
            if command_str.starts_with("--") {
                len -= 2;
            }
            let doc: &str = sub_command.get_documentation().unwrap_or_default();
            let doc = doc.split('\n').next().unwrap();
            println!(
                "  {}{}  {}{} {}",
                sub_command.blue(),
                " ".repeat(max_command_len - len),
                doc,
                " ".repeat(max_doc_len - doc.len()),
                if sub_command.allows_filter() {
                    "- supports filter".fg::<Gray>()
                } else {
                    "".fg::<Gray>()
                },
            );
        }
        println!();
        println!(
            "See {} {} {} for more information about a {}",
            "haze help".blue(),
            command.blue(),
            "<COMMAND>".green(),
            "<COMMAND>".green()
        );
    }

    println!();
    if !args.is_empty() {
        let max_arg_len = args
            .iter()
            .map(|(arg, _)| arg.len())
            .max()
            .unwrap_or_default();
        println!("{}", "Arguments:".yellow().bold());
        for (arg, desc) in args {
            println!(
                "  {}{}{}{}  {}",
                "[".green(),
                arg.green(),
                "]".green(),
                " ".repeat(max_arg_len - arg.len()),
                desc
            );
        }
    }

    if let Some(details) = command.get_str("Details") {
        println!("{}", format_details(details));
    }
}

fn format_details(details: &str) -> String {
    use std::fmt::Write;
    let mut result = String::with_capacity(details.len());
    for (i, part) in details.split("</").enumerate() {
        let part = if i > 0 {
            // strip the remaining close tag from the previous part
            part.split_once('>').map(|(_, part)| part).unwrap_or(part)
        } else {
            part
        };
        let (head, tail) = part.split_once('<').unwrap_or((part, ""));
        result.push_str(head);
        if let Some((tag, content)) = tail.split_once('>') {
            match tag {
                "literal" => write!(&mut result, "{}", content.blue()).unwrap(),
                "arg" => write!(&mut result, "{}", content.green()).unwrap(),
                "yellow" => write!(&mut result, "{}", content.bright_yellow()).unwrap(),
                _ => write!(&mut result, "{content}").unwrap(),
            }
        }
    }
    result
}