//! Integration tests for the `hitsnip` command.

use std::fs;
use std::path::{Path, PathBuf};
use std::str;

use assert_cmd::Command;
use predicates::prelude::*;
use tempfile::{TempDir, tempdir};

const SAMPLE_RS: &str = "reading/sample.rs";

fn cargo_command() -> Command {
    Command::cargo_bin("hitsnip").expect("binary")
}

fn workspace_root() -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("..")
        .join("..")
        .canonicalize()
        .expect("workspace root")
}

fn fixture(path: &str) -> PathBuf {
    workspace_root().join("fixtures").join(path)
}

fn temp_file(name: &str, contents: impl AsRef<[u8]>) -> (TempDir, PathBuf) {
    let dir = tempdir().expect("tempdir");
    let path = dir.path().join(name);
    fs::write(&path, contents).expect("fixture");
    (dir, path)
}

fn pwsh_command(script: impl AsRef<str>) -> Command {
    let mut command = Command::new("pwsh");
    command
        .arg("-NoProfile")
        .arg("-Command")
        .arg(script.as_ref());
    command
}

fn ps_quote(value: impl std::fmt::Display) -> String {
    format!("'{}'", value.to_string().replace('\'', "''"))
}

fn relative_to_workspace(path: &Path) -> String {
    path.strip_prefix(workspace_root())
        .expect("path within workspace")
        .display()
        .to_string()
}

#[test]
fn merges_rg_hits_into_compact_text_snippets() {
    let mut command = cargo_command();
    command
        .current_dir(workspace_root())
        .arg("--context")
        .arg("1")
        .arg("--max-gap")
        .arg("1")
        .write_stdin(std::fs::read_to_string(fixture("hits/rg-output.txt")).expect("fixture"))
        .assert()
        .success()
        .stdout(predicate::str::contains(
            "path=fixtures\\reading\\sample.rs lines=17:27 hits=3",
        ))
        .stdout(predicate::str::contains("hit_lines=18,22,26"))
        .stdout(predicate::str::contains("18: pub fn run"))
        .stdout(predicate::str::contains(
            "path=fixtures\\reading\\sample.cs lines=8:10 hits=1",
        ));
}

#[test]
fn accepts_explicit_hit_arguments_and_emits_json() {
    let sample = fixture(SAMPLE_RS);
    let hit_a = format!("{}:18", sample.display());
    let hit_b = format!("{}:26:9", sample.display());

    let mut command = cargo_command();
    command
        .arg("--json")
        .arg("--context")
        .arg("0")
        .arg("--max-gap")
        .arg("10")
        .arg(&hit_a)
        .arg(&hit_b)
        .assert()
        .success()
        .stdout(predicate::str::contains("\"start_line\":18"))
        .stdout(predicate::str::contains("\"end_line\":26"))
        .stdout(predicate::str::contains("\"hit_count\":2"))
        .stdout(predicate::str::contains("\"hit_lines\":[18,26]"));
}

#[test]
fn supports_powershell_pipeline_for_hit_lines() {
    let binary = assert_cmd::cargo::cargo_bin("hitsnip");
    let sample = relative_to_workspace(&fixture(SAMPLE_RS));
    let script = format!(
        "{},{} | & {} --context 0 --max-gap 0 --json",
        ps_quote(format!("{sample}:18")),
        ps_quote(format!("{sample}:26")),
        ps_quote(binary.display())
    );

    let mut command = pwsh_command(script);
    command
        .current_dir(workspace_root())
        .assert()
        .success()
        .stdout(predicate::str::contains(
            "\"path\":\"fixtures\\\\reading\\\\sample.rs\"",
        ))
        .stdout(predicate::str::contains("\"selected\"").not());
}

#[test]
fn utf8_bom_source_file_does_not_pollute_first_snippet_line() {
    let (_dir, source) = temp_file("bom.rs", "\u{feff}fn main() {}\nfn helper() {}\n");

    let mut command = cargo_command();
    command
        .arg("--context")
        .arg("0")
        .arg(format!("{}:1", source.display()))
        .assert()
        .success()
        .stdout(predicate::str::contains("1: fn main() {}"))
        .stdout(predicate::str::contains("\u{feff}fn main").not());
}

#[test]
fn invalid_utf8_source_file_reports_read_error() {
    let (_dir, source) = temp_file("invalid-utf8.rs", [0x66, 0x80, 0x0A]);

    let mut command = cargo_command();
    command
        .arg("--context")
        .arg("0")
        .arg(format!("{}:1", source.display()))
        .assert()
        .failure()
        .stderr(predicate::str::contains("failed to read"))
        .stderr(predicate::str::contains("invalid-utf8.rs"));
}

#[test]
fn help_includes_rg_and_powershell_examples() {
    let mut command = cargo_command();
    command
        .arg("--help")
        .assert()
        .success()
        .stdout(predicate::str::contains("rg -nH"))
        .stdout(predicate::str::contains("ConvertFrom-Json"))
        .stdout(predicate::str::contains("--max-gap"));
}

#[test]
fn help_puts_rg_nh_before_pathless_rg_examples() {
    let mut command = cargo_command();
    let output = command
        .arg("--help")
        .assert()
        .success()
        .get_output()
        .stdout
        .clone();
    let help = str::from_utf8(&output).expect("help is utf8");
    let rg_nh = help.find("rg -nH").expect("rg -nH example");
    let rg_n_pathless = help
        .find("rg -n \"Mode::\"")
        .expect("pathless rg -n example");
    assert!(
        rg_nh < rg_n_pathless,
        "the safest rg -nH example should appear before pathless rg -n"
    );
}