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// Copyright 2020 nest.land core team.

use crate::swc_util::{AstParser, SwcDiagnosticBuffer};
use swc_ecma_ast::{CallExpr, ExportAll, ImportDecl, NamedExport};
use swc_ecma_parser::Syntax;
use swc_ecma_parser::TsConfig;
use swc_ecma_visit::Node;
use swc_ecma_visit::Visit;

struct DependencyVisitor {
  dependencies: Vec<String>,
  analyze_dynamic_imports: bool,
}

impl Visit for DependencyVisitor {
  fn visit_import_decl(
    &mut self,
    import_decl: &ImportDecl,
    _parent: &dyn Node,
  ) {
    let src_str = import_decl.src.value.to_string();
    self.dependencies.push(src_str);
  }

  fn visit_named_export(
    &mut self,
    named_export: &NamedExport,
    _parent: &dyn Node,
  ) {
    if let Some(src) = &named_export.src {
      let src_str = src.value.to_string();
      self.dependencies.push(src_str);
    }
  }

  fn visit_export_all(&mut self, export_all: &ExportAll, _parent: &dyn Node) {
    let src_str = export_all.src.value.to_string();
    self.dependencies.push(src_str);
  }

  fn visit_call_expr(&mut self, call_expr: &CallExpr, _parent: &dyn Node) {
    use swc_ecma_ast::{
      Expr::*, ExprOrSpread, ExprOrSuper::*, Ident, Lit::Str,
    };
    if !self.analyze_dynamic_imports {
      return;
    }

    match call_expr.callee.clone() {
      Expr(box Ident(Ident { sym, .. })) =>
      {
        #[allow(clippy::cmp_owned)]
        if sym.to_string() != "import" {
          return;
        }
      }
      _ => return,
    };

    if let Some(ExprOrSpread {
      expr: box Lit(Str(src)),
      ..
    }) = call_expr.args.get(0)
    {
      self.dependencies.push(src.value.to_string());
    }
  }
}

// Analyze the dependencies of a source file
pub fn analyze_dependencies(
  filename: &str,
  source_code: &str,
  analyze_dynamic_imports: bool,
) -> Result<Vec<String>, SwcDiagnosticBuffer> {
  let parser = AstParser::new();
  let mut ts_config = TsConfig::default();
  ts_config.dynamic_import = true;
  let syntax = Syntax::Typescript(ts_config);
  let parse_result = parser.parse_module(filename, syntax, source_code)?;
  let mut collector = DependencyVisitor {
    dependencies: vec![],
    analyze_dynamic_imports,
  };
  collector.visit_module(&parse_result, &parse_result);
  Ok(collector.dependencies)
}

#[test]
fn test_analyze_dependencies() {
  let source = r#"
import * as spam from "./spam.ts";
import { foo } from "./foo.ts";
export { bar } from "./foo.ts";
export * from "./bar.ts";
"#;

  let dependencies =
    analyze_dependencies("index.ts", source, false).expect("Failed to parse");
  assert_eq!(
    dependencies,
    vec![
      "./spam.ts".to_string(),
      "./foo.ts".to_string(),
      "./foo.ts".to_string(),
      "./bar.ts".to_string(),
    ]
  );
}

#[test]
fn test_analyze_dependencies_dyn_imports() {
  let source = r#"
import { foo } from "./foo.ts";
export { bar } from "./foo.ts";
export * from "./bar.ts";
const a = await import("./fizz.ts");
const b = await import("./" + "buzz.ts");
const c = await import("hello" + "world");
const d = call("yo");
"#;

  let dependencies =
    analyze_dependencies("index.ts", source, true).expect("Failed to parse");
  assert_eq!(
    dependencies,
    vec![
      "./foo.ts".to_string(),
      "./foo.ts".to_string(),
      "./bar.ts".to_string(),
      "./fizz.ts".to_string(),
    ]
  );
}