// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
use crate::{LanguageFeatures, TargetCapabilityFlags, compile};
use expect_test::expect;
use qsc_data_structures::source::SourceMap;
use qsc_frontend::compile::CompileUnit;
use qsc_passes::PackageType;
use qsc_project::{PackageInfo, Project, ProjectType};
use rustc_hash::FxHashMap;
use std::sync::Arc;

fn mock_program() -> Project {
    // Mock data for the ProgramConfig
    let package_graph_sources = qsc_project::PackageGraphSources {
        root: qsc_project::PackageInfo {
            sources: vec![(
                Arc::from("test.qs"),
                Arc::from("@EntryPoint() operation Main() : Unit {}"),
            )],
            language_features: LanguageFeatures::default(),
            dependencies: FxHashMap::from_iter(vec![(
                Arc::from("SomeLibraryAlias"),
                Arc::from("SomeLibraryKey"),
            )]),
            package_type: Some(qsc_project::PackageType::Exe),
        },
        packages: FxHashMap::from_iter(vec![(
            Arc::from("SomeLibraryKey"),
            PackageInfo {
                sources: vec![(
                    Arc::from("librarymain"),
                    Arc::from("operation LibraryMain() : Unit {} export LibraryMain;"),
                )],
                language_features: LanguageFeatures::default(),
                dependencies: FxHashMap::default(),
                package_type: Some(qsc_project::PackageType::Lib),
            },
        )]),
        has_manifest: true,
    };

    Project {
        lints: vec![],
        errors: vec![],
        path: "project/qsharp.json".into(),
        name: "project".into(),
        project_type: qsc_project::ProjectType::QSharp(package_graph_sources),
        target_profile: Some(qsc_data_structures::target::Profile::Unrestricted),
    }
}

#[test]
fn test_prepare_package_store() {
    let program = mock_program();
    let ProjectType::QSharp(package_graph_sources) = program.project_type else {
        panic!("project should be a Q# project");
    };
    let buildable_program =
        super::prepare_package_store(TargetCapabilityFlags::default(), package_graph_sources);

    expect![[r"
            []
        "]]
    .assert_debug_eq(&buildable_program.dependency_errors);

    // compile the user code
    let compiled = compile::compile(
        &buildable_program.store,
        &buildable_program.user_code_dependencies[..],
        SourceMap::new(buildable_program.user_code.sources, None),
        PackageType::Exe,
        TargetCapabilityFlags::default(),
        LanguageFeatures::default(),
    );

    let CompileUnit {
        package,
        ast,
        errors,
        ..
    } = compiled.0;

    expect![[r#"
        Package:
            entry expression: Expr 8 [0-0] [Type Unit]: Call:
                Expr 7 [24-28] [Type Unit]: Var: Item 1 (Package 3)
                Expr 6 [28-30] [Type Unit]: Unit
            Item 0 [0-40] (Public):
                Namespace (Ident 5 [0-40] "test"): Item 1
            Item 1 [0-40] (Internal):
                Parent: 0
                EntryPoint
                Callable 0 [14-40] (operation):
                    name: Ident 1 [24-28] "Main"
                    input: Pat 2 [28-30] [Type Unit]: Unit
                    output: Unit
                    functors: empty set
                    body: SpecDecl 3 [14-40]: Impl:
                        Block 4 [38-40]: <empty>
                    adj: <none>
                    ctl: <none>
                    ctl-adj: <none>"#]]
    .assert_eq(&package.to_string());
    expect![[r#"
            Package 0:
                Namespace 1 [0-40] (Ident 2 [0-40] "test"):
                    Item 3 [0-40]:
                        Attr 4 [0-13] (Ident 5 [1-11] "EntryPoint"):
                            Expr 6 [11-13]: Unit
                        Callable 7 [14-40] (Operation):
                            name: Ident 8 [24-28] "Main"
                            input: Pat 9 [28-30]: Unit
                            output: Type 10 [33-37]: Path: Path 11 [33-37] (Ident 12 [33-37] "Unit")
                            body: Block: Block 13 [38-40]: <empty>"#]]
    .assert_eq(&ast.package.to_string());
    expect![[r"
            []
        "]]
    .assert_debug_eq(&errors);
}

// if there are inconsequential errors in the dependency compilation process, we don't want to
// abort compilation. This way, we can still show the user some diagnostics.

#[test]
fn missing_dependency_doesnt_force_failure() {
    let program = mock_program();
    let ProjectType::QSharp(mut package_graph_sources) = program.project_type else {
        panic!("project should be a Q# project");
    };
    package_graph_sources
        .root
        .dependencies
        .insert("NonExistent".into(), "nonexistent-dep-key".into());

    let buildable_program =
        super::prepare_package_store(TargetCapabilityFlags::default(), package_graph_sources);

    expect![[r"
            []
        "]]
    .assert_debug_eq(&buildable_program.dependency_errors);

    // compile the user code
    let compiled = compile::compile(
        &buildable_program.store,
        &buildable_program.user_code_dependencies[..],
        SourceMap::new(buildable_program.user_code.sources, None),
        PackageType::Exe,
        TargetCapabilityFlags::default(),
        LanguageFeatures::default(),
    );

    let CompileUnit {
        package,
        ast,
        errors,
        ..
    } = compiled.0;

    expect![[r#"
        Package:
            entry expression: Expr 8 [0-0] [Type Unit]: Call:
                Expr 7 [24-28] [Type Unit]: Var: Item 1 (Package 3)
                Expr 6 [28-30] [Type Unit]: Unit
            Item 0 [0-40] (Public):
                Namespace (Ident 5 [0-40] "test"): Item 1
            Item 1 [0-40] (Internal):
                Parent: 0
                EntryPoint
                Callable 0 [14-40] (operation):
                    name: Ident 1 [24-28] "Main"
                    input: Pat 2 [28-30] [Type Unit]: Unit
                    output: Unit
                    functors: empty set
                    body: SpecDecl 3 [14-40]: Impl:
                        Block 4 [38-40]: <empty>
                    adj: <none>
                    ctl: <none>
                    ctl-adj: <none>"#]]
    .assert_eq(&package.to_string());
    expect![[r#"
            Package 0:
                Namespace 1 [0-40] (Ident 2 [0-40] "test"):
                    Item 3 [0-40]:
                        Attr 4 [0-13] (Ident 5 [1-11] "EntryPoint"):
                            Expr 6 [11-13]: Unit
                        Callable 7 [14-40] (Operation):
                            name: Ident 8 [24-28] "Main"
                            input: Pat 9 [28-30]: Unit
                            output: Type 10 [33-37]: Path: Path 11 [33-37] (Ident 12 [33-37] "Unit")
                            body: Block: Block 13 [38-40]: <empty>"#]]
    .assert_eq(&ast.package.to_string());
    expect![[r"
            []
        "]]
    .assert_debug_eq(&errors);
}

#[allow(clippy::too_many_lines)]
#[test]
fn dependency_error() {
    let program = mock_program();
    // Inject a syntax error into one of the dependencies
    let ProjectType::QSharp(mut package_graph_sources) = program.project_type else {
        panic!("project should be a Q# project");
    };
    package_graph_sources
        .packages
        .values_mut()
        .next()
        .expect("expected at least one dependency in the mock program")
        .sources[0]
        .1 = "broken_syntax".into();

    let buildable_program =
        super::prepare_package_store(TargetCapabilityFlags::default(), package_graph_sources);

    expect![[r#"
        [
            WithSource {
                sources: [
                    Source {
                        name: "librarymain",
                        contents: "broken_syntax",
                        offset: 0,
                    },
                ],
                error: Frontend(
                    Error(
                        Parse(
                            Error(
                                Token(
                                    Eof,
                                    Ident,
                                    Span {
                                        lo: 0,
                                        hi: 13,
                                    },
                                ),
                            ),
                        ),
                    ),
                ),
            },
        ]
    "#]]
    .assert_debug_eq(&buildable_program.dependency_errors);

    // compile the user code
    let compiled = compile::compile(
        &buildable_program.store,
        &buildable_program.user_code_dependencies[..],
        SourceMap::new(buildable_program.user_code.sources, None),
        PackageType::Exe,
        TargetCapabilityFlags::default(),
        LanguageFeatures::default(),
    );

    let CompileUnit {
        package,
        ast,
        errors,
        ..
    } = compiled.0;

    expect![[r#"
        Package:
            entry expression: Expr 8 [0-0] [Type Unit]: Call:
                Expr 7 [24-28] [Type Unit]: Var: Item 1 (Package 3)
                Expr 6 [28-30] [Type Unit]: Unit
            Item 0 [0-40] (Public):
                Namespace (Ident 5 [0-40] "test"): Item 1
            Item 1 [0-40] (Internal):
                Parent: 0
                EntryPoint
                Callable 0 [14-40] (operation):
                    name: Ident 1 [24-28] "Main"
                    input: Pat 2 [28-30] [Type Unit]: Unit
                    output: Unit
                    functors: empty set
                    body: SpecDecl 3 [14-40]: Impl:
                        Block 4 [38-40]: <empty>
                    adj: <none>
                    ctl: <none>
                    ctl-adj: <none>"#]]
    .assert_eq(&package.to_string());
    expect![[r#"
            Package 0:
                Namespace 1 [0-40] (Ident 2 [0-40] "test"):
                    Item 3 [0-40]:
                        Attr 4 [0-13] (Ident 5 [1-11] "EntryPoint"):
                            Expr 6 [11-13]: Unit
                        Callable 7 [14-40] (Operation):
                            name: Ident 8 [24-28] "Main"
                            input: Pat 9 [28-30]: Unit
                            output: Type 10 [33-37]: Path: Path 11 [33-37] (Ident 12 [33-37] "Unit")
                            body: Block: Block 13 [38-40]: <empty>"#]]
    .assert_eq(&ast.package.to_string());
    expect![[r"
            []
        "]]
    .assert_debug_eq(&errors);
}

#[allow(clippy::too_many_lines)]
#[test]
fn entry_point_profile_in_project_causes_error() {
    let program = mock_program();
    // Inject a syntax error into one of the dependencies
    let ProjectType::QSharp(mut package_graph_sources) = program.project_type else {
        panic!("project should be a Q# project");
    };
    package_graph_sources
        .root
        .sources
        .iter_mut()
        .next()
        .expect("expected at least one source in the mock program")
        .1 = "@EntryPoint(Base) operation Main() : Unit { }".into();

    let buildable_program =
        super::prepare_package_store(TargetCapabilityFlags::default(), package_graph_sources);

    expect![[r#"
        [
            WithSource {
                sources: [
                    Source {
                        name: "test.qs",
                        contents: "@EntryPoint(Base) operation Main() : Unit { }",
                        offset: 0,
                    },
                ],
                error: EntryPointProfileInProject(
                    Span {
                        lo: 12,
                        hi: 16,
                    },
                ),
            },
        ]
    "#]]
    .assert_debug_eq(&buildable_program.dependency_errors);
}