use clap::{Parser, Subcommand};
use serde::{Deserialize}; use serde_yaml::{self, Value};
use std::{fs, str};
use std::path::{PathBuf};
use std::collections::HashMap;
#[derive(Parser)]
struct Cli {
    #[clap(subcommand)]
    command: Command,
}
#[derive(Subcommand)]
enum Command {
    #[clap(parse(from_os_str))]
    Build { path: PathBuf },
}
#[derive(Deserialize, Debug)]
struct Karbonfile {
    api_version: String,
    kind, String,
    #[serde(default)]
    resources: Vec<PathBuf>,
    #[serde(default)]
    generators: Vec<Generator>,
    #[serde(default)]
    transformations: Vec<Transformation>,
}
#[derive(Deserialize, Debug)]
#[serde(deny_unknown_fields)]
#[serde(rename_all = "camelCase")]
enum Generator {
    ConfigMap,
}
#[derive(Deserialize, Debug)]
#[serde(deny_unknown_fields)]
struct Transformation {
    #[serde(default)]
    target: Target,
    #[serde(default)]
    namespace: String,
    #[serde(default)]
    patches: Vec<JSONPatch>,
    #[serde(default)]
    replicas: u8,
    #[serde(default)]
    labels: HashMap<String, String>,
}
#[derive(Deserialize, Default, Debug)]
#[serde(deny_unknown_fields)]
#[serde(rename_all = "camelCase")]
struct Target {
    #[serde(default)]
    api_group: String,
    #[serde(default)]
    api_version: String,
    #[serde(default)]
    kind: String,
    #[serde(default)]
    name: String,
    #[serde(default)]
    namespace: String,
    #[serde(default)]
    labels: HashMap<String, String>,
}
#[derive(Deserialize, Debug)]
#[serde(deny_unknown_fields)]
#[serde(rename_all = "camelCase")]
struct JSONPatch {
    op: JSONPatchOp,
    path: String,
    value: serde_yaml::Value,
}
#[derive(Deserialize, Debug)]
#[serde(rename_all = "lowercase")]
enum JSONPatchOp {
    Add,
    Replace,
}
fn parse_karbonfile(file_path: &PathBuf) -> Karbonfile {
    let file = fs::File::open(file_path)
        .expect("Failed to open the file.");
    return serde_yaml::from_reader(file)
        .expect("Failed to parse to file.");
}
fn is_karbonfile(path: &PathBuf) -> bool {
}
fn karbonfile(path: &PathBuf) -> (PathBuf, Karbonfile) {
    let mut karbonfile_path: PathBuf = path
                .canonicalize()
                .expect("Failed to canonicalize the path provided.");
    // When given a directory search for any karbon.{yml, yaml} file.
    if karbonfile_path.is_dir() {
        karbonfile_path.push("karbon.yml");
        if !karbonfile_path.is_file() {
            karbonfile_path = karbonfile_path.with_extension("yaml");
        };
        if !karbonfile_path.is_file() {
            panic!("No karbon.yml or karbon.yaml file found.")
        };
    };
    let content: Karbonfile = parse_karbonfile(&karbonfile_path);
    println!("{:?}", &content);
    return (karbonfile_path, content);
}
fn build_karbonfile_list(path: &PathBuf, accumulator: &mut Vec<PathBuf>) {
    let (karbonfile_path, content) = karbonfile(&path);
    accumulator.push(karbonfile_path);
    for resource in content.resources.iter() {
        let full_path = &path.join(resource);
        match &full_path.file_name().unwrap().to_string_lossy() {
            "karbon.yml" | "karbon.yaml" =>
                build_karbonfile_list(&full_path, accumulator),
        }
    }
}
fn main() {
    let cli = Cli::parse();
    match &cli.command {
        Command::Build { path } => {
            let mut accumulator: Vec<PathBuf> = Vec::new();
            build_karbonfile_list(path, &mut accumulator);
            for i in accumulator.iter() {
                println!("{:?}", &i);
            }
        }
    }
}

---
apiVersion: karbon/v1alpha1
kind: Karbonfile
resources:
  - ../../base
transformations:
  - target:
      kind: Deployment
    patches:
      - op: add
        path: /spec/template/spec/containers/0/command
        value: ["worker"]

---
apiVersion: karbon/v1alpha1
kind: Karbonfile
resources:
  - ../../base
transformations:
  - target:
      kind: Deployment
    patches:
      - op: add
        path: /spec/template/spec/containers/0/command
        value: ["web"]
      - op: add
        path: /spec/template/spec/containers/0/args
        value:  ["start", "-p", "8080"]

---
apiVersion: karbon/v1alpha1
kind: Karbonfile
resources:
  - ../../overlays/worker
  - ../../overlays/web
transformations:
  - namespace: prod
  - target:
      kind: Deployment
    replicas: 5

---
apiVersion: v1
kind: Service
metadata:
  name: myApp
spec:
  ports:
    - name: http
      port: 80
      targetPort: 8080

---
apiVersion: karbon/v1alpha1
kind: Karbonfile
resources:
  - deployment.yml
  - service.yml
transformations:
  - labels:
      app.kubernetes.io/name: flower
      app.kubernetes.io/component: flower

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myApp
spec:
  replicas: 1
  template:
    spec:
      containers:
        - image: myApp/myImage:v0.0.1
          name: myApp
          ports:
            - name: http
              containerPort: 8080

[package]
name = "karbon"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
clap = { version = "3.0", features = ["derive"] }
serde = { version = "1.0", features = ["derive"] }
serde_yaml = "0.8"
url = { version = "2", features = ["serde"] }

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# It is not intended for manual editing.
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# Generated by Cargo
# will have compiled files and executables
debug/
target/
# These are backup files generated by rustfmt
**/*.rs.bk
# MSVC Windows builds of rustc generate these, which store debugging information
*.pdb