import os
import term

const vroot = @VMODROOT
const test_dir = os.join_path(vroot, 'vlib', 'v', 'tests', 'vls', 'multifile_gotodef')
const main_file = os.join_path(test_dir, 'main.v')
const types_file = os.join_path(test_dir, 'types.v')
const types_expected = os.join_path('multifile_gotodef', 'types.v')

struct TestCase {
    name        string
    line        int
    col         int
    expected    string
    description string
}

const test_cases = [
    TestCase{
        name:        'struct_name_cross_file'
        line:        4
        col:         12
        expected:    types_expected + ':3:11'
        description: 'Go to struct definition in another file (MyStruct in types.v)'
    },
    TestCase{
        name:        'method_call_cross_file'
        line:        8
        col:         18
        expected:    types_expected + ':14:21'
        description: 'Go to method definition in another file (get_value in types.v)'
    },
    TestCase{
        name:        'struct_field_cross_file'
        line:        11
        col:         22
        expected:    types_expected + ':4:1'
        description: 'Go to struct field definition in another file (value in types.v)'
    },
    TestCase{
        name:        'enum_value_cross_file'
        line:        14
        col:         15
        expected:    types_expected + ':9:1'
        description: 'Go to enum value definition in another file (first in types.v)'
    },
    TestCase{
        name:        'enum_short_form_cross_file'
        line:        18
        col:         4
        expected:    types_expected + ':10:1'
        description: 'Go to enum value definition from short form in match (.second in types.v)'
    },
]

fn test_multifile_goto_definition() {
    mut total_errors := 0
    mut passed := 0

    // Change to vls directory so relative paths match expected output
    original_dir := os.getwd()
    vls_dir := os.join_path(vroot, 'vlib', 'v', 'tests', 'vls')
    os.chdir(vls_dir) or { panic(err) }
    defer {
        os.chdir(original_dir) or {}
    }

    for tc in test_cases {
        cmd := 'v -w -check -json-errors -nocolor -vls-mode -line-info "${main_file}:${tc.line}:gd^${tc.col}" ${os.quoted_path('multifile_gotodef')}'
        res := os.execute(cmd)

        if res.exit_code < 0 {
            println('${term.red('FAIL')} ${tc.name}: Command failed to execute')
            println('  Command: ${cmd}')
            total_errors++
            continue
        }

        res_output := $if windows {
            res.output.replace('\r\n', '\n').trim_space()
        } $else {
            res.output.trim_space()
        }

        if tc.expected != res_output {
            println('${term.red('FAIL')} ${tc.name}')
            println('  Description: ${tc.description}')
            println('  Line ${tc.line}, Column ${tc.col}')
            println('  Expected: ${tc.expected}')
            println('  Got:      ${res_output}')
            total_errors++
        } else {
            println('${term.green('OK  ')} ${tc.name}: ${tc.description}')
            passed++
        }
    }

    println('')
    println('${term.header('Summary:', '=')}')
    println('Passed: ${passed}/${test_cases.len}')
    if total_errors > 0 {
        println('${term.red('Failed:')} ${total_errors}')
    }

    assert total_errors == 0, 'Some tests failed'
}