use indexmap::IndexMap;
use req::*;
use stringlit::s;

fn nl() -> String {
    s!("")
}

fn add_requirements(output: &mut Vec<String>, requirements: &IndexMap<String, Requirement>) {
    for (id, requirement) in requirements {
        output.push(format!(
            "- **{id} {}:** {}",
            requirement.name, requirement.description
        ));
    }
}

fn add_topics(output: &mut Vec<String>, topics: &IndexMap<String, Topic>, level: usize) {
    for (id, topic) in topics {
        output.push(format!("{} {id} {}", "#".repeat(level), topic.name));
        if !topic.requirements.is_empty() {
            add_requirements(output, &topic.requirements);
            output.push(nl());
        }
        if !topic.subtopics.is_empty() {
            add_topics(output, &topic.subtopics, level + 1);
            output.push(nl());
        }
    }
}

fn main() -> anyhow::Result<()> {
    // std::fs::write("req.yml", serde_yaml::to_string(&project)?)?;
    let project: Project = serde_yaml::from_str(&std::fs::read_to_string("req.yml")?)?;

    let mut output = vec![
        format!("# Requirements for {}", project.name),
        nl(),
        s!("[[_TOC_]]"),
        nl(),
        WORD_DESCRIPTION.to_string(),
        nl(),
        s!("## Description"),
        project.description,
        nl(),
    ];

    if !project.topics.is_empty() {
        output.push(s!("## Requirements"));
        add_topics(&mut output, &project.topics, 3);
        output.push(nl());
    }

    if !project.definitions.is_empty() {
        output.push(s!("## Definitions"));
        for definition in project.definitions {
            output.push(format!("- {}: {}", definition.name, definition.value));
            for info in definition.additional_info {
                output.push(format!("  - {info}"))
            }
        }
        output.push(nl());
    }

    if !project.config_defaults.is_empty() {
        output.push(s!("## Config Defaults"));
        for default in project.config_defaults {
            output.push(format!("- **{}**", default.name));
            output.push(format!("  - Type: {}", default.typ));
            if let Some(unit) = default.unit {
                output.push(format!("  - Unit: {unit}"));
            }
            if let Some(valid_values) = default.valid_values {
                output.push(format!("  - Valid Values: _{}_", valid_values.join(", ")));
            }
            if let Some(default_value) = default.default_value {
                output.push(format!(
                    "  - Default Value: _{}_{}",
                    default_value,
                    default.hint.map(|h| format!(" {h}")).unwrap_or_default()
                ));
            } else {
                output.push(format!(
                    "  - **Required**: This value **_MUST_** be provided as a start parameter.{}",
                    default.hint.map(|h| format!(" {h}")).unwrap_or_default()
                ));
            }
            output.push(nl());
        }
    }

    println!("{}", output.join("\n"));

    Ok(())
}