use std::fmt;
use std::result::Result;
use std::error::Error;
use std::panic::catch_unwind;

use super::*;

#[test]
fn test_set_get() {
    let lua = Lua::new();
    lua.set("foo", "bar").unwrap();
    lua.set("baz", "baf").unwrap();
    assert_eq!(lua.get::<_, String>("foo").unwrap(), "bar");
    assert_eq!(lua.get::<_, String>("baz").unwrap(), "baf");
}

#[test]
fn test_load() {
    let lua = Lua::new();
    lua.load(r#"
            res = 'foo'..'bar'
        "#,
              None)
        .unwrap();
    assert_eq!(lua.get::<_, String>("res").unwrap(), "foobar");
}

#[test]
fn test_eval() {
    let lua = Lua::new();
    assert_eq!(lua.eval::<i32>("1 + 1").unwrap(), 2);
    assert_eq!(lua.eval::<bool>("false == false").unwrap(), true);
    assert_eq!(lua.eval::<i32>("return 1 + 2").unwrap(), 3);
    match lua.eval::<()>("if true then") {
        Err(LuaError(LuaErrorKind::IncompleteStatement(_), _)) => {}
        r => panic!("expected IncompleteStatement, got {:?}", r),
    }
}

#[test]
fn test_table() {
    let lua = Lua::new();

    lua.set("table", lua.create_empty_table().unwrap()).unwrap();
    let table1: LuaTable = lua.get("table").unwrap();
    let table2: LuaTable = lua.get("table").unwrap();

    table1.set("foo", "bar").unwrap();
    table2.set("baz", "baf").unwrap();

    assert_eq!(table2.get::<_, String>("foo").unwrap(), "bar");
    assert_eq!(table1.get::<_, String>("baz").unwrap(), "baf");

    lua.load(r#"
            table1 = {1, 2, 3, 4, 5}
            table2 = {}
            table3 = {1, 2, nil, 4, 5}
        "#,
              None)
        .unwrap();

    let table1 = lua.get::<_, LuaTable>("table1").unwrap();
    let table2 = lua.get::<_, LuaTable>("table2").unwrap();
    let table3 = lua.get::<_, LuaTable>("table3").unwrap();

    assert_eq!(table1.length().unwrap(), 5);
    assert_eq!(table1.pairs::<i64, i64>().unwrap(),
               vec![(1, 1), (2, 2), (3, 3), (4, 4), (5, 5)]);
    assert_eq!(table2.length().unwrap(), 0);
    assert_eq!(table2.pairs::<i64, i64>().unwrap(), vec![]);
    assert_eq!(table2.array_values::<i64>().unwrap(), vec![]);
    assert_eq!(table3.length().unwrap(), 5);
    assert_eq!(table3.array_values::<Option<i64>>().unwrap(),
               vec![Some(1), Some(2), None, Some(4), Some(5)]);
}

#[test]
fn test_function() {
    let lua = Lua::new();
    lua.load(r#"
            function concat(arg1, arg2)
                return arg1 .. arg2
            end
        "#,
              None)
        .unwrap();

    let concat = lua.get::<_, LuaFunction>("concat").unwrap();
    assert_eq!(concat.call::<_, String>(hlist!["foo", "bar"]).unwrap(),
               "foobar");
}

#[test]
fn test_bind() {
    let lua = Lua::new();
    lua.load(r#"
            function concat(...)
                local res = ""
                for _, s in pairs({...}) do
                    res = res..s
                end
                return res
            end
        "#,
              None)
        .unwrap();

    let mut concat = lua.get::<_, LuaFunction>("concat").unwrap();
    concat = concat.bind("foo").unwrap();
    concat = concat.bind("bar").unwrap();
    concat = concat.bind(hlist!["baz", "baf"]).unwrap();
    assert_eq!(concat.call::<_, String>(hlist!["hi", "wut"]).unwrap(),
               "foobarbazbafhiwut");
}

#[test]
fn test_rust_function() {
    let lua = Lua::new();
    lua.load(r#"
            function lua_function()
                return rust_function()
            end

            -- Test to make sure chunk return is ignored
            return 1
        "#,
              None)
        .unwrap();

    let lua_function = lua.get::<_, LuaFunction>("lua_function").unwrap();
    let rust_function = lua.create_function(|lua, _| lua.pack("hello")).unwrap();

    lua.set("rust_function", rust_function).unwrap();
    assert_eq!(lua_function.call::<_, String>(()).unwrap(), "hello");
}

#[test]
fn test_user_data() {
    struct UserData1(i64);
    struct UserData2(Box<i64>);

    impl LuaUserDataType for UserData1 {};
    impl LuaUserDataType for UserData2 {};

    let lua = Lua::new();

    let userdata1 = lua.create_userdata(UserData1(1)).unwrap();
    let userdata2 = lua.create_userdata(UserData2(Box::new(2))).unwrap();

    assert!(userdata1.is::<UserData1>());
    assert!(!userdata1.is::<UserData2>());
    assert!(userdata2.is::<UserData2>());
    assert!(!userdata2.is::<UserData1>());

    assert_eq!(userdata1.borrow::<UserData1>().unwrap().0, 1);
    assert_eq!(*userdata2.borrow::<UserData2>().unwrap().0, 2);
}

#[test]
fn test_methods() {
    struct UserData(i64);

    impl LuaUserDataType for UserData {
        fn add_methods(methods: &mut LuaUserDataMethods<Self>) {
            methods.add_method("get_value", |lua, data, _| lua.pack(data.0));
            methods.add_method_mut("set_value", |lua, data, args| {
                data.0 = lua.unpack(args)?;
                lua.pack(())
            });
        }
    }

    let lua = Lua::new();
    let userdata = lua.create_userdata(UserData(42)).unwrap();
    lua.set("userdata", userdata.clone()).unwrap();
    lua.load(r#"
            function get_it()
                return userdata:get_value()
            end

            function set_it(i)
                return userdata:set_value(i)
            end
        "#,
              None)
        .unwrap();
    let get = lua.get::<_, LuaFunction>("get_it").unwrap();
    let set = lua.get::<_, LuaFunction>("set_it").unwrap();
    assert_eq!(get.call::<_, i64>(()).unwrap(), 42);
    userdata.borrow_mut::<UserData>().unwrap().0 = 64;
    assert_eq!(get.call::<_, i64>(()).unwrap(), 64);
    set.call::<_, ()>(100).unwrap();
    assert_eq!(get.call::<_, i64>(()).unwrap(), 100);
}

#[test]
fn test_metamethods() {
    #[derive(Copy, Clone)]
    struct UserData(i64);

    impl LuaUserDataType for UserData {
        fn add_methods(methods: &mut LuaUserDataMethods<Self>) {
            methods.add_method("get", |lua, data, _| lua.pack(data.0));
            methods.add_meta_function(LuaMetaMethod::Add, |lua, args| {
                let hlist_pat![lhs, rhs] = lua.unpack::<HList![UserData, UserData]>(args)?;
                lua.pack(UserData(lhs.0 + rhs.0))
            });
            methods.add_meta_function(LuaMetaMethod::Sub, |lua, args| {
                let hlist_pat![lhs, rhs] = lua.unpack::<HList![UserData, UserData]>(args)?;
                lua.pack(UserData(lhs.0 - rhs.0))
            });
            methods.add_meta_method(LuaMetaMethod::Index, |lua, data, args| {
                let index = lua.unpack::<LuaString>(args)?;
                if index.get()? == "inner" {
                    lua.pack(data.0)
                } else {
                    Err("no such custom index".into())
                }
            });
        }
    }

    let lua = Lua::new();
    lua.set("userdata1", UserData(7)).unwrap();
    lua.set("userdata2", UserData(3)).unwrap();
    assert_eq!(lua.eval::<UserData>("userdata1 + userdata2").unwrap().0, 10);
    assert_eq!(lua.eval::<UserData>("userdata1 - userdata2").unwrap().0, 4);
    assert_eq!(lua.eval::<i64>("userdata1:get()").unwrap(), 7);
    assert_eq!(lua.eval::<i64>("userdata2.inner").unwrap(), 3);
    assert!(lua.eval::<()>("userdata2.nonexist_field").is_err());
}

#[test]
fn test_scope() {
    let lua = Lua::new();
    lua.load(r#"
            touter = {
                tin = {1, 2, 3}
            }
        "#,
              None)
        .unwrap();

    // Make sure that table gets do not borrow the table, but instead just borrow lua.
    let tin;
    {
        let touter = lua.get::<_, LuaTable>("touter").unwrap();
        tin = touter.get::<_, LuaTable>("tin").unwrap();
    }

    assert_eq!(tin.get::<_, i64>(1).unwrap(), 1);
    assert_eq!(tin.get::<_, i64>(2).unwrap(), 2);
    assert_eq!(tin.get::<_, i64>(3).unwrap(), 3);

    // Should not compile, don't know how to test that
    // struct UserData;
    // impl LuaUserDataType for UserData {};
    // let userdata_ref;
    // {
    //     let touter = lua.get::<_, LuaTable>("touter").unwrap();
    //     touter.set("userdata", lua.create_userdata(UserData).unwrap()).unwrap();
    //     let userdata = touter.get::<_, LuaUserData>("userdata").unwrap();
    //     userdata_ref = userdata.borrow::<UserData>();
    // }
}

#[test]
fn test_lua_multi() {
    let lua = Lua::new();
    lua.load(r#"
            function concat(arg1, arg2)
                return arg1 .. arg2
            end

            function mreturn()
                return 1, 2, 3, 4, 5, 6
            end
        "#,
              None)
        .unwrap();

    let concat = lua.get::<_, LuaFunction>("concat").unwrap();
    let mreturn = lua.get::<_, LuaFunction>("mreturn").unwrap();

    assert_eq!(concat.call::<_, String>(hlist!["foo", "bar"]).unwrap(),
               "foobar");
    let hlist_pat![a, b] = mreturn.call::<_, HList![u64, u64]>(hlist![]).unwrap();
    assert_eq!((a, b), (1, 2));
    let hlist_pat![a, b, LuaVariadic(v)] = mreturn.call::<_, HList![u64, u64, LuaVariadic<u64>]>(hlist![]).unwrap();
    assert_eq!((a, b), (1, 2));
    assert_eq!(v, vec![3, 4, 5, 6]);
}

#[test]
fn test_coercion() {
    let lua = Lua::new();
    lua.load(r#"
            int = 123
            str = "123"
            num = 123.0
        "#,
              None)
        .unwrap();

    assert_eq!(lua.get::<_, String>("int").unwrap(), "123");
    assert_eq!(lua.get::<_, i32>("str").unwrap(), 123);
    assert_eq!(lua.get::<_, i32>("num").unwrap(), 123);
}

#[test]
fn test_error() {
    #[derive(Debug)]
    pub struct TestError;

    impl fmt::Display for TestError {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
            write!(fmt, "test error")
        }
    }

    impl Error for TestError {
        fn description(&self) -> &str {
            "test error"
        }

        fn cause(&self) -> Option<&Error> {
            None
        }
    }

    let lua = Lua::new();
    lua.load(r#"
            function no_error()
            end

            function lua_error()
                error("this is a lua error")
            end

            function rust_error()
                rust_error_function()
            end

            function test_pcall()
                local testvar = 0

                pcall(function(arg)
                    testvar = testvar + arg
                    error("should be ignored")
                end, 3)

                local function handler(err)
                    testvar = testvar + err
                    return "should be ignored"
                end

                xpcall(function()
                    error(5)
                end, handler)

                if testvar ~= 8 then
                    error("testvar had the wrong value, pcall / xpcall misbehaving "..testvar)
                end
            end

            function understand_recursion()
                understand_recursion()
            end
        "#,
              None)
        .unwrap();

    let rust_error_function =
        lua.create_function(|_, _| Err(LuaExternalError(Box::new(TestError)).into()))
            .unwrap();
    lua.set("rust_error_function", rust_error_function).unwrap();

    let no_error = lua.get::<_, LuaFunction>("no_error").unwrap();
    let lua_error = lua.get::<_, LuaFunction>("lua_error").unwrap();
    let rust_error = lua.get::<_, LuaFunction>("rust_error").unwrap();
    let test_pcall = lua.get::<_, LuaFunction>("test_pcall").unwrap();
    let understand_recursion = lua.get::<_, LuaFunction>("understand_recursion").unwrap();

    assert!(no_error.call::<_, ()>(()).is_ok());
    match lua_error.call::<_, ()>(()) {
        Err(LuaError(LuaErrorKind::ScriptError(_), _)) => {}
        Err(_) => panic!("error is not ScriptError kind"),
        _ => panic!("error not thrown"),
    }
    match rust_error.call::<_, ()>(()) {
        Err(LuaError(LuaErrorKind::CallbackError(_), _)) => {}
        Err(_) => panic!("error is not CallbackError kind"),
        _ => panic!("error not thrown"),
    }

    test_pcall.call::<_, ()>(()).unwrap();

    assert!(understand_recursion.call::<_, ()>(()).is_err());

    match catch_unwind(|| -> LuaResult<()> {
        let lua = Lua::new();
        lua.load(r#"
                function rust_panic()
                    pcall(function () rust_panic_function() end)
                end
            "#,
                  None)?;
        let rust_panic_function = lua.create_function(|_, _| {
            panic!("expected panic, this panic should be caught in rust")
        })?;
        lua.set("rust_panic_function", rust_panic_function)?;

        let rust_panic = lua.get::<_, LuaFunction>("rust_panic")?;

        rust_panic.call::<_, ()>(())
    }) {
        Ok(Ok(_)) => panic!("no panic was detected, pcall caught it!"),
        Ok(Err(e)) => panic!("error during panic test {:?}", e),
        Err(_) => {}
    };

    match catch_unwind(|| -> LuaResult<()> {
        let lua = Lua::new();
        lua.load(r#"
                function rust_panic()
                    xpcall(function() rust_panic_function() end, function() end)
                end
            "#,
                  None)?;
        let rust_panic_function = lua.create_function(|_, _| {
            panic!("expected panic, this panic should be caught in rust")
        })?;
        lua.set("rust_panic_function", rust_panic_function)?;

        let rust_panic = lua.get::<_, LuaFunction>("rust_panic")?;

        rust_panic.call::<_, ()>(())
    }) {
        Ok(Ok(_)) => panic!("no panic was detected, xpcall caught it!"),
        Ok(Err(e)) => panic!("error during panic test {:?}", e),
        Err(_) => {}
    };
}