//! End-to-end CLI tests against small, self-created fixture repos.

use std::io::Write;
use std::path::{Path, PathBuf};
use std::process::{Command, Stdio};
use std::sync::OnceLock;

use serde_json::Value;

fn bin() -> &'static str {
    env!("CARGO_BIN_EXE_rustytokens")
}

/// Shared temp cache dir so tests never touch the real ~/.cache/rustytokens.
fn cache_dir() -> &'static Path {
    static DIR: OnceLock<PathBuf> = OnceLock::new();
    DIR.get_or_init(|| {
        let d = std::env::temp_dir().join(format!("rustytokens-test-cache-{}", std::process::id()));
        std::fs::create_dir_all(&d).unwrap();
        d
    })
}

fn fixture(name: &str) -> PathBuf {
    Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("tests/fixtures")
        .join(name)
}

fn copy_dir(src: &Path, dst: &Path) {
    std::fs::create_dir_all(dst).unwrap();
    for entry in std::fs::read_dir(src).unwrap() {
        let entry = entry.unwrap();
        let to = dst.join(entry.file_name());
        if entry.path().is_dir() {
            copy_dir(&entry.path(), &to);
        } else {
            std::fs::copy(entry.path(), &to).unwrap();
        }
    }
}

/// Run the binary with the fixture's cache dir, returning parsed stdout JSON.
fn run_json(args: &[&str]) -> Value {
    let out = Command::new(bin())
        .args(args)
        .env("XDG_CACHE_HOME", cache_dir())
        .output()
        .expect("run rustytokens");
    assert!(
        out.status.success(),
        "command failed: {:?}\nstderr: {}",
        args,
        String::from_utf8_lossy(&out.stderr)
    );
    serde_json::from_slice(&out.stdout).expect("stdout is valid JSON")
}

#[test]
fn rust_index_search_and_dead() {
    let fx = fixture("rustdemo");
    run_json(&["index", "create", fx.to_str().unwrap()]);

    let hits = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "search",
        "symbols",
        "add",
    ]);
    let hit = hits
        .as_array()
        .unwrap()
        .iter()
        .find(|v| v["name"] == "add")
        .expect("search finds `add`");
    assert_eq!(hit["kind"], "function");

    // inspect symbol by id returns the exact source.
    let id = hit["id"].as_i64().unwrap();
    let sym = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "inspect",
        "symbol",
        &id.to_string(),
    ]);
    assert!(
        sym["source"].as_str().unwrap().contains("a + b"),
        "source contains function body"
    );

    // dead.rs is flagged; entry points lib.rs/main.rs are not.
    let dead = run_json(&["--project", fx.to_str().unwrap(), "find", "dead"]);
    let paths: Vec<&str> = dead["files"]
        .as_array()
        .unwrap()
        .iter()
        .map(|f| f["path"].as_str().unwrap())
        .collect();
    assert!(paths.contains(&"src/dead.rs"), "dead.rs flagged");
    assert!(!paths.contains(&"src/lib.rs"), "lib.rs is an entry point");
    assert!(!paths.contains(&"src/main.rs"), "main.rs is an entry point");
}

#[test]
fn inspect_blast_radius_finds_affected_files() {
    let src = fixture("rustdemo");
    let tmp = cache_dir().join("blast-rustdemo");
    let _ = std::fs::remove_dir_all(&tmp);
    copy_dir(&src, &tmp);
    run_json(&["index", "create", tmp.to_str().unwrap()]);

    let blast = run_json(&[
        "--project",
        tmp.to_str().unwrap(),
        "inspect",
        "blast-radius",
        "src/util.rs",
    ]);
    assert_eq!(blast["count"], 1);
    assert_eq!(blast["file"], "src/util.rs");
    let affected: Vec<&str> = blast["affected"]
        .as_array()
        .unwrap()
        .iter()
        .map(|f| f["path"].as_str().unwrap())
        .collect();
    assert_eq!(affected, ["src/lib.rs"], "lib.rs imports util.rs");
}

#[test]
fn python_import_resolution_and_dead() {
    let fx = fixture("pydemo");
    run_json(&["index", "create", fx.to_str().unwrap()]);

    let importers = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "find",
        "importers",
        "util.py",
    ]);
    let names: Vec<&str> = importers
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(names.contains(&"main.py"), "main.py imports util.py");

    let dead = run_json(&["--project", fx.to_str().unwrap(), "find", "dead"]);
    let paths: Vec<&str> = dead["files"]
        .as_array()
        .unwrap()
        .iter()
        .map(|f| f["path"].as_str().unwrap())
        .collect();
    assert!(paths.contains(&"dead.py"), "dead.py flagged");
    assert!(!paths.contains(&"util.py"), "util.py is imported");
}

#[test]
fn typescript_cycle_detection() {
    let fx = fixture("tsdemo");
    run_json(&["index", "create", fx.to_str().unwrap()]);

    let cycles = run_json(&["--project", fx.to_str().unwrap(), "inspect", "cycles"]);
    assert_eq!(cycles["count"], 1, "one cycle");
    let cycle = &cycles["cycles"][0];
    let files: Vec<&str> = cycle
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(
        files.contains(&"a.ts") && files.contains(&"b.ts"),
        "a↔b cycle"
    );
}

#[test]
fn java_symbols_and_import_resolution() {
    let fx = fixture("javademo");
    run_json(&["index", "create", fx.to_str().unwrap()]);

    let hits = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "search",
        "symbols",
        "helper",
    ]);
    let hit = hits
        .as_array()
        .unwrap()
        .iter()
        .find(|v| v["name"] == "helper")
        .expect("search finds `helper`");
    assert_eq!(hit["kind"], "method");

    // ctags reports Java constructors as `method` with a full `end` span, so
    // the multi-line `Main` constructor must carry line_end > line_start.
    let ctor = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "search",
        "symbols",
        "Main",
    ]);
    let ctor_hit = ctor
        .as_array()
        .unwrap()
        .iter()
        .find(|v| v["name"] == "Main" && v["kind"] == "method")
        .expect("search finds `Main` constructor");
    assert!(
        ctor_hit["line_end"].as_i64().unwrap() > ctor_hit["line_start"].as_i64().unwrap(),
        "multi-line constructor has an extended span"
    );

    let importers = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "find",
        "importers",
        "Util.java",
    ]);
    let names: Vec<&str> = importers
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(names.contains(&"Main.java"), "Main.java imports Util.java");
}

#[test]
fn c_and_cpp_symbols_and_imports() {
    let cdemo = fixture("cdemo");
    run_json(&["index", "create", cdemo.to_str().unwrap()]);

    let hits = run_json(&[
        "--project",
        cdemo.to_str().unwrap(),
        "search",
        "symbols",
        "helper",
    ]);
    assert!(
        hits.as_array()
            .unwrap()
            .iter()
            .any(|v| v["name"] == "helper"),
        "c demo indexes `helper`"
    );

    let importers = run_json(&[
        "--project",
        cdemo.to_str().unwrap(),
        "find",
        "importers",
        "util.h",
    ]);
    let names: Vec<&str> = importers
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(names.contains(&"main.c") && names.contains(&"util.c"));

    let cppdemo = fixture("cppdemo");
    run_json(&["index", "create", cppdemo.to_str().unwrap()]);

    let hits = run_json(&[
        "--project",
        cppdemo.to_str().unwrap(),
        "search",
        "symbols",
        "add",
    ]);
    assert!(
        hits.as_array().unwrap().iter().any(|v| v["name"] == "add"),
        "cpp demo indexes `add`"
    );

    // ctags reports C++ constructors/destructors as `function` with an `end`
    // span; the multi-line `Math` ctor must carry line_end > line_start.
    let ctor = run_json(&[
        "--project",
        cppdemo.to_str().unwrap(),
        "search",
        "symbols",
        "Math",
    ]);
    let ctor_hit = ctor
        .as_array()
        .unwrap()
        .iter()
        .find(|v| v["name"] == "Math" && v["kind"] == "function")
        .expect("search finds `Math` constructor");
    assert_eq!(ctor_hit["kind"], "function");
    assert!(
        ctor_hit["line_end"].as_i64().unwrap() > ctor_hit["line_start"].as_i64().unwrap(),
        "multi-line constructor has an extended span"
    );

    // Destructor is also `function` with a ctags-owned `end` span (name `~Math`).
    let dtor_hit = ctor
        .as_array()
        .unwrap()
        .iter()
        .find(|v| v["name"] == "~Math" && v["kind"] == "function")
        .expect("search finds `~Math` destructor");
    assert!(
        dtor_hit["line_end"].as_i64().unwrap() > dtor_hit["line_start"].as_i64().unwrap(),
        "multi-line destructor has an extended span"
    );

    let importers = run_json(&[
        "--project",
        cppdemo.to_str().unwrap(),
        "find",
        "importers",
        "math.hpp",
    ]);
    let names: Vec<&str> = importers
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(
        names.contains(&"main.cpp") && names.contains(&"math.cpp"),
        "both cpp files include math.hpp"
    );
}

#[test]
fn html_assets_are_discovered_and_imported() {
    let fx = fixture("htmldemo");
    run_json(&["index", "create", fx.to_str().unwrap()]);

    let importers = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "find",
        "importers",
        "app.js",
    ]);
    let names: Vec<&str> = importers
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(
        names.contains(&"index.html"),
        "index.html imports app.js via <script src>"
    );

    let css = run_json(&[
        "--project",
        fx.to_str().unwrap(),
        "find",
        "importers",
        "style.css",
    ]);
    let names: Vec<&str> = css
        .as_array()
        .unwrap()
        .iter()
        .map(|v| v.as_str().unwrap())
        .collect();
    assert!(
        names.contains(&"index.html"),
        "index.html imports style.css via <link href>"
    );
}

#[test]
fn mcp_serve_handles_tool_call() {
    let src = fixture("rustdemo");
    let tmp = cache_dir().join("mcp-rustdemo");
    let _ = std::fs::remove_dir_all(&tmp);
    copy_dir(&src, &tmp);
    run_json(&["index", "create", tmp.to_str().unwrap()]);

    let mut child = Command::new(bin())
        .args(["--project", tmp.to_str().unwrap(), "serve"])
        .env("XDG_CACHE_HOME", cache_dir())
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::null())
        .spawn()
        .expect("spawn serve");

    {
        let mut stdin = child.stdin.take().unwrap();
        writeln!(stdin, r#"{{"jsonrpc":"2.0","id":1,"method":"initialize"}}"#).unwrap();
        writeln!(
            stdin,
            r#"{{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{{"name":"search_symbols","arguments":{{"query":"add"}}}}}}"#
        )
        .unwrap();
    } // drop stdin -> closes the pipe, server exits

    let out = child.wait_with_output().unwrap();
    assert!(out.status.success(), "serve exits cleanly");

    let responses: Vec<Value> = String::from_utf8_lossy(&out.stdout)
        .lines()
        .filter_map(|l| serde_json::from_str(l).ok())
        .collect();
    let init = responses
        .iter()
        .find(|r| r["id"] == 1)
        .expect("initialize response");
    assert_eq!(init["result"]["serverInfo"]["name"], "rustytokens");

    let call = responses
        .iter()
        .find(|r| r["id"] == 2)
        .expect("tools/call response");
    let text = call["result"]["content"][0]["text"].as_str().unwrap();
    let hits: Value = serde_json::from_str(text).unwrap();
    assert!(
        hits.as_array().unwrap().iter().any(|h| h["name"] == "add"),
        "search_symbols over MCP finds `add`"
    );
}

#[test]
fn index_update_reindexes_changed_files() {
    let src = fixture("javademo");
    let tmp = cache_dir().join("update-javademo");
    let _ = std::fs::remove_dir_all(&tmp);
    copy_dir(&src, &tmp);

    run_json(&["index", "create", tmp.to_str().unwrap()]);

    let before = run_json(&[
        "--project",
        tmp.to_str().unwrap(),
        "search",
        "symbols",
        "brandNew",
    ]);
    assert!(
        before.as_array().unwrap().is_empty(),
        "new symbol absent before update"
    );

    let lib = tmp.join("BrandNew.java");
    std::fs::write(
        &lib,
        "package demo;\n\npublic class BrandNew {\n    public static int brandNew() { return 7; }\n}\n",
    )
    .unwrap();

    run_json(&["index", "update", tmp.to_str().unwrap()]);

    let after = run_json(&[
        "--project",
        tmp.to_str().unwrap(),
        "search",
        "symbols",
        "brandNew",
    ]);
    assert!(
        after
            .as_array()
            .unwrap()
            .iter()
            .any(|h| h["name"] == "brandNew"),
        "index update picks up the new symbol"
    );
}