//! Integration tests for `cph-typst` under the ADR-0011 model: the engine
//! compiles a **template file** (`exports/<target>.typ`) as main, injecting an
//! **augmented manifest** (per-part `fields` array of on-disk content fields)
//! served as a virtual file, and resolving `@local/cph-render` + vendored
//! `@preview/numbly` from the repo `render/` directory.
//!
//! There is no render-stub any more: the stock templates import the real
//! `cph-render` package's full API (`render-lesson`, `part-fields`,
//! `default-heading-numbering`), so the tests point the [`Engine`] at the real
//! repo `render/` package. These tests require system CJK fonts (present on dev
//! and CI via fonts-noto-cjk) and the vendored numbly (committed under
//! `render/vendor/`), so they run fully offline.

use std::path::PathBuf;

use cph_diag::Severity;
use cph_typst::{build_augmented_manifest, Engine};

fn fixture_root() -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("tests/fixtures/mini")
}

fn real_render_dir() -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR"))
        .join("..")
        .join("..")
        .join("render")
}

fn load_mini() -> cph_model::Lesson {
    let (lesson, diags) = cph_model::load(&fixture_root());
    let lesson = lesson.expect("mini fixture loads into a Lesson");
    let errors: Vec<_> = diags
        .iter()
        .filter(|d| d.severity == Severity::Error)
        .collect();
    assert!(errors.is_empty(), "fixture has loader errors: {errors:?}");
    lesson
}

/// PURE UNIT TEST (no fonts, no render package): the augmented manifest carries
/// `[info]`, the ordered `[[parts]]`, and a per-part `fields` array listing the
/// content fields present on disk.
#[test]
fn augmented_manifest_has_per_part_fields() {
    let lesson = load_mini();
    let src = build_augmented_manifest(&lesson);

    // Info round-trips.
    assert!(src.contains("迷你示例课时"), "info.title present:\n{src}");
    assert!(src.contains("测试作者"), "info.author present:\n{src}");

    // Parse it back to inspect the per-part fields precisely.
    let doc: toml::Value = toml::from_str(&src).expect("augmented manifest is valid TOML");
    let parts = doc
        .get("parts")
        .and_then(|p| p.as_array())
        .expect("parts array present");
    assert_eq!(parts.len(), 4, "four parts in declared order:\n{src}");

    // `fields` is a presence SET (the template tests membership), so order is
    // not load-bearing; sort for a stable assertion.
    let fields_of = |idx: usize| -> Vec<String> {
        let mut v: Vec<String> = parts[idx]
            .get("fields")
            .and_then(|f| f.as_array())
            .expect("part has a fields array")
            .iter()
            .map(|v| v.as_str().unwrap().to_string())
            .collect();
        v.sort();
        v
    };
    let path_of = |idx: usize| {
        parts[idx]
            .get("path")
            .unwrap()
            .as_str()
            .unwrap()
            .to_string()
    };
    let kind_of = |idx: usize| {
        parts[idx]
            .get("kind")
            .unwrap()
            .as_str()
            .unwrap()
            .to_string()
    };

    // Order preserved: segment, lemma (w/ proof), lemma (no proof), example.
    assert_eq!(kind_of(0), "segment");
    assert_eq!(kind_of(1), "lemma");
    assert_eq!(kind_of(2), "lemma");
    assert_eq!(kind_of(3), "example");

    // Paths kept as forward-slash UTF-8.
    assert_eq!(path_of(0), "segments/开场对照导言");
    assert_eq!(path_of(2), "lemmas/无证明引理");

    // segment: only `textbook` exists.
    assert_eq!(fields_of(0), vec!["textbook"]);
    // lemma WITH proof.typ: both stmt + proof present (sorted).
    assert_eq!(fields_of(1), vec!["proof", "stmt"]);
    // lemma WITHOUT proof.typ: only stmt present (the OPTIONAL-content path).
    assert_eq!(
        fields_of(2),
        vec!["stmt"],
        "proof must be omitted when absent"
    );
    // example: problem + solution present (source is a scalar, not a content field).
    assert_eq!(fields_of(3), vec!["problem", "solution"]);
}

/// THROUGH-TEMPLATE compile-check against the REAL render package: compiling the
/// student template as main with the injected augmented manifest is clean (zero
/// Error-severity diagnostics). This proves the template → manifest → include
/// loop → cph-render path, including the optional-content gate (the second lemma
/// has no proof.typ and must NOT cause a missing-include error).
#[test]
fn compile_check_clean_through_template() {
    let lesson = load_mini();
    let engine = Engine::with_render_dir(real_render_dir());
    let diags = engine.compile_check(&lesson, "student");
    let errors: Vec<_> = diags
        .iter()
        .filter(|d| d.severity == Severity::Error)
        .collect();
    assert!(errors.is_empty(), "unexpected compile errors: {errors:#?}");
}

/// THROUGH-TEMPLATE PDF export, fully offline (vendored numbly + @local/cph-render):
/// a non-trivial PDF is produced for both targets through the real templates.
/// This is also the offline-`@preview/numbly` proof — `render/src/style.typ`
/// imports `@preview/numbly:0.1.0`, resolved from the vendored dir with no
/// network access; a failure there would surface as a package-not-found error.
#[test]
fn build_pdf_through_template_offline() {
    let lesson = load_mini();
    let render_dir = real_render_dir();
    assert!(
        render_dir.join("lib.typ").is_file(),
        "real render package missing at {}",
        render_dir.display()
    );
    assert!(
        render_dir
            .join("vendor/typst-packages/preview/numbly/0.1.0/lib.typ")
            .is_file(),
        "vendored numbly missing under {}",
        render_dir.display()
    );
    let engine = Engine::with_render_dir(render_dir);

    for target in ["student", "teacher"] {
        let pdf = engine
            .build_pdf(&lesson, target)
            .unwrap_or_else(|d| panic!("{target} PDF build failed: {d:#?}"));
        assert!(pdf.starts_with(b"%PDF"), "{target} output is a PDF");
        assert!(
            pdf.len() > 1024,
            "{target} PDF is non-trivial (got {} bytes)",
            pdf.len()
        );
        eprintln!(
            "build_pdf_through_template_offline: {target} PDF = {} bytes (numbly resolved offline)",
            pdf.len()
        );
        let out = std::env::temp_dir().join(format!("cph-typst-mini-{target}.pdf"));
        std::fs::write(&out, &pdf).expect("write pdf");
    }
}

/// An undeclared target name (when the lesson declares at least one target) is a
/// blocking `SchemaViolation`, not a compile attempt.
#[test]
fn unknown_target_is_blocking() {
    let lesson = load_mini();
    let engine = Engine::with_render_dir(real_render_dir());
    let diags = engine.compile_check(&lesson, "nonexistent");
    assert_eq!(diags.len(), 1, "one blocking diagnostic: {diags:#?}");
    assert_eq!(diags[0].severity, Severity::Error);
    assert!(
        diags[0].message.contains("not declared"),
        "expected an undeclared-target error: {diags:#?}"
    );
}

/// A `file-tree` artifact is deferred for MVP: a clear "not yet implemented"
/// blocking diagnostic rather than a wrong build.
#[test]
fn file_tree_artifact_is_deferred() {
    use cph_model::{Artifact, Info, Lesson, Project, Step, TargetConfig};

    let lesson = Lesson {
        project: Project {
            id: "x".into(),
            name: "x".into(),
        },
        info: Info {
            title: "t".into(),
            authors: vec![],
        },
        parts: vec![],
        targets: vec![TargetConfig {
            name: "web".into(),
            artifact: Artifact::FileTree {
                root: PathBuf::from("build/web"),
                outputs: "**/*.html".into(),
            },
            steps: vec![Step::TypstCompile {
                template: PathBuf::from("exports/web.typ"),
            }],
            covers: None,
        }],
        root: fixture_root(),
    };

    let engine = Engine::with_render_dir(real_render_dir());
    let diags = engine.compile_check(&lesson, "web");
    assert_eq!(diags.len(), 1, "one blocking diagnostic: {diags:#?}");
    assert!(
        diags[0].message.contains("file-tree"),
        "expected a file-tree deferral: {diags:#?}"
    );
}

/// A target whose only step is a `shell` step (no typst-compile) is deferred for
/// MVP with a clear blocking diagnostic.
#[test]
fn shell_only_target_is_deferred() {
    use cph_model::{Artifact, Info, Lesson, Project, Step, TargetConfig};

    let lesson = Lesson {
        project: Project {
            id: "x".into(),
            name: "x".into(),
        },
        info: Info {
            title: "t".into(),
            authors: vec![],
        },
        parts: vec![],
        targets: vec![TargetConfig {
            name: "packaged".into(),
            artifact: Artifact::SingleFile {
                filepath: PathBuf::from("build/packaged.zip"),
            },
            steps: vec![Step::Shell {
                run: "echo hi".into(),
            }],
            covers: None,
        }],
        root: fixture_root(),
    };

    let engine = Engine::with_render_dir(real_render_dir());
    let diags = engine.compile_check(&lesson, "packaged");
    assert_eq!(diags.len(), 1, "one blocking diagnostic: {diags:#?}");
    assert!(
        diags[0].message.contains("no typst-compile step"),
        "expected a no-typst-compile-step deferral: {diags:#?}"
    );
}