use std::{env::current_dir, path::PathBuf};

use serde::Deserialize;

const CUDDLE_FILE_NAME: &str = "cuddle.toml";

pub struct ProjectPlan {
    config: Config,
    pub root: PathBuf,
}

impl ProjectPlan {
    pub fn new(config: Config, root: PathBuf) -> Self {
        Self { config, root }
    }

    pub fn from_file(content: &str, root: PathBuf) -> anyhow::Result<Self> {
        let config: Config = toml::from_str(&content)?;

        Ok(Self::new(config, root))
    }

    pub async fn from_current_path() -> anyhow::Result<Option<Self>> {
        let cur_dir = current_dir()?;
        let cuddle_file = cur_dir.join(CUDDLE_FILE_NAME);

        tracing::trace!(
            path = cuddle_file.display().to_string(),
            "searching for cuddle.toml project file"
        );

        if !cuddle_file.exists() {
            tracing::debug!("no cuddle.toml project file found");
            // We may want to recursively search for the file (towards root)
            return Ok(None);
        }

        let cuddle_project_file = tokio::fs::read_to_string(cuddle_file).await?;

        Ok(Some(Self::from_file(&cuddle_project_file, cur_dir)?))
    }

    pub fn has_plan(&self) -> bool {
        self.config.plan.is_some()
    }

    pub fn get_plan(&self) -> Plan {
        match &self.config.plan {
            Some(PlanConfig::Bare(git)) | Some(PlanConfig::Git { git }) => Plan::Git(git.clone()),
            Some(PlanConfig::Folder { path }) => Plan::Folder(path.clone()),
            None => Plan::None,
        }
    }
}

pub enum Plan {
    None,
    Git(String),
    Folder(PathBuf),
}

#[derive(Debug, Clone, Deserialize, PartialEq)]
pub struct Config {
    plan: Option<PlanConfig>,
}

#[derive(Debug, Clone, Deserialize, PartialEq)]
#[serde(untagged)]
pub enum PlanConfig {
    Bare(String),
    Git { git: String },
    Folder { path: PathBuf },
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_can_parse_simple_file() -> anyhow::Result<()> {
        let project = ProjectPlan::from_file(
            r##"
[plan]
git = "https://github.com/kjuulh/some-cuddle-project"
             "##,
            PathBuf::new(),
        )?;

        assert_eq!(
            Config {
                plan: Some(PlanConfig::Git {
                    git: "https://github.com/kjuulh/some-cuddle-project".into()
                })
            },
            project.config
        );

        Ok(())
    }

    #[test]
    fn test_can_parse_simple_file_bare() -> anyhow::Result<()> {
        let project = ProjectPlan::from_file(
            r##"
plan = "https://github.com/kjuulh/some-cuddle-project"
"##,
            PathBuf::new(),
        )?;

        assert_eq!(
            Config {
                plan: Some(PlanConfig::Bare(
                    "https://github.com/kjuulh/some-cuddle-project".into()
                ))
            },
            project.config
        );

        Ok(())
    }

    #[test]
    fn test_can_parse_simple_file_none() -> anyhow::Result<()> {
        let project = ProjectPlan::from_file(r##""##, PathBuf::new())?;

        assert_eq!(Config { plan: None }, project.config);

        Ok(())
    }
}