using namespace System.Management.Automation
using namespace System.Management.Automation.Language

Register-ArgumentCompleter -Native -CommandName 'git-cliff' -ScriptBlock {
    param($wordToComplete, $commandAst, $cursorPosition)

    $commandElements = $commandAst.CommandElements
    $command = @(
        'git-cliff'
        for ($i = 1; $i -lt $commandElements.Count; $i++) {
            $element = $commandElements[$i]
            if ($element -isnot [StringConstantExpressionAst] -or
                $element.StringConstantType -ne [StringConstantType]::BareWord -or
                $element.Value.StartsWith('-') -or
                $element.Value -eq $wordToComplete) {
                break
        }
        $element.Value
    }) -join ';'

    $completions = @(switch ($command) {
        'git-cliff' {
            [CompletionResult]::new('-i', '-i', [CompletionResultType]::ParameterName, 'Writes the default configuration file to cliff.toml')
            [CompletionResult]::new('--init', '--init', [CompletionResultType]::ParameterName, 'Writes the default configuration file to cliff.toml')
            [CompletionResult]::new('-c', '-c', [CompletionResultType]::ParameterName, 'Sets the configuration file')
            [CompletionResult]::new('--config', '--config', [CompletionResultType]::ParameterName, 'Sets the configuration file')
            [CompletionResult]::new('-w', '-w', [CompletionResultType]::ParameterName, 'Sets the working directory')
            [CompletionResult]::new('--workdir', '--workdir', [CompletionResultType]::ParameterName, 'Sets the working directory')
            [CompletionResult]::new('-r', '-r', [CompletionResultType]::ParameterName, 'Sets the git repository')
            [CompletionResult]::new('--repository', '--repository', [CompletionResultType]::ParameterName, 'Sets the git repository')
            [CompletionResult]::new('--include-path', '--include-path', [CompletionResultType]::ParameterName, 'Sets the path to include related commits')
            [CompletionResult]::new('--exclude-path', '--exclude-path', [CompletionResultType]::ParameterName, 'Sets the path to exclude related commits')
            [CompletionResult]::new('--tag-pattern', '--tag-pattern', [CompletionResultType]::ParameterName, 'Sets the regex for matching git tags')
            [CompletionResult]::new('--with-commit', '--with-commit', [CompletionResultType]::ParameterName, 'Sets custom commit messages to include in the changelog')
            [CompletionResult]::new('--with-tag-message', '--with-tag-message', [CompletionResultType]::ParameterName, 'Sets custom message for the latest release')
            [CompletionResult]::new('--ignore-tags', '--ignore-tags', [CompletionResultType]::ParameterName, 'Sets the tags to ignore in the changelog')
            [CompletionResult]::new('--count-tags', '--count-tags', [CompletionResultType]::ParameterName, 'Sets the tags to count in the changelog')
            [CompletionResult]::new('--skip-commit', '--skip-commit', [CompletionResultType]::ParameterName, 'Sets commits that will be skipped in the changelog')
            [CompletionResult]::new('-p', '-p', [CompletionResultType]::ParameterName, 'Prepends entries to the given changelog file')
            [CompletionResult]::new('--prepend', '--prepend', [CompletionResultType]::ParameterName, 'Prepends entries to the given changelog file')
            [CompletionResult]::new('-o', '-o', [CompletionResultType]::ParameterName, 'Writes output to the given file')
            [CompletionResult]::new('--output', '--output', [CompletionResultType]::ParameterName, 'Writes output to the given file')
            [CompletionResult]::new('-t', '-t', [CompletionResultType]::ParameterName, 'Sets the tag for the latest version')
            [CompletionResult]::new('--tag', '--tag', [CompletionResultType]::ParameterName, 'Sets the tag for the latest version')
            [CompletionResult]::new('--bump', '--bump', [CompletionResultType]::ParameterName, 'Bumps the version for unreleased changes. Optionally with specified version')
            [CompletionResult]::new('-b', '-b', [CompletionResultType]::ParameterName, 'Sets the template for the changelog body')
            [CompletionResult]::new('--body', '--body', [CompletionResultType]::ParameterName, 'Sets the template for the changelog body')
            [CompletionResult]::new('--from-context', '--from-context', [CompletionResultType]::ParameterName, 'Generates changelog from a JSON context')
            [CompletionResult]::new('-s', '-s', [CompletionResultType]::ParameterName, 'Strips the given parts from the changelog')
            [CompletionResult]::new('--strip', '--strip', [CompletionResultType]::ParameterName, 'Strips the given parts from the changelog')
            [CompletionResult]::new('--sort', '--sort', [CompletionResultType]::ParameterName, 'Sets sorting of the commits inside sections')
            [CompletionResult]::new('--github-token', '--github-token', [CompletionResultType]::ParameterName, 'Sets the GitHub API token')
            [CompletionResult]::new('--github-repo', '--github-repo', [CompletionResultType]::ParameterName, 'Sets the GitHub repository')
            [CompletionResult]::new('--gitlab-token', '--gitlab-token', [CompletionResultType]::ParameterName, 'Sets the GitLab API token')
            [CompletionResult]::new('--gitlab-repo', '--gitlab-repo', [CompletionResultType]::ParameterName, 'Sets the GitLab repository')
            [CompletionResult]::new('--gitea-token', '--gitea-token', [CompletionResultType]::ParameterName, 'Sets the Gitea API token')
            [CompletionResult]::new('--gitea-repo', '--gitea-repo', [CompletionResultType]::ParameterName, 'Sets the GitLab repository')
            [CompletionResult]::new('--bitbucket-token', '--bitbucket-token', [CompletionResultType]::ParameterName, 'Sets the Bitbucket API token')
            [CompletionResult]::new('--bitbucket-repo', '--bitbucket-repo', [CompletionResultType]::ParameterName, 'Sets the Bitbucket repository')
            [CompletionResult]::new('-h', '-h', [CompletionResultType]::ParameterName, 'Prints help information')
            [CompletionResult]::new('--help', '--help', [CompletionResultType]::ParameterName, 'Prints help information')
            [CompletionResult]::new('-V', '-V ', [CompletionResultType]::ParameterName, 'Prints version information')
            [CompletionResult]::new('--version', '--version', [CompletionResultType]::ParameterName, 'Prints version information')
            [CompletionResult]::new('-v', '-v', [CompletionResultType]::ParameterName, 'Increases the logging verbosity')
            [CompletionResult]::new('--verbose', '--verbose', [CompletionResultType]::ParameterName, 'Increases the logging verbosity')
            [CompletionResult]::new('--bumped-version', '--bumped-version', [CompletionResultType]::ParameterName, 'Prints bumped version for unreleased changes')
            [CompletionResult]::new('-l', '-l', [CompletionResultType]::ParameterName, 'Processes the commits starting from the latest tag')
            [CompletionResult]::new('--latest', '--latest', [CompletionResultType]::ParameterName, 'Processes the commits starting from the latest tag')
            [CompletionResult]::new('--current', '--current', [CompletionResultType]::ParameterName, 'Processes the commits that belong to the current tag')
            [CompletionResult]::new('-u', '-u', [CompletionResultType]::ParameterName, 'Processes the commits that do not belong to a tag')
            [CompletionResult]::new('--unreleased', '--unreleased', [CompletionResultType]::ParameterName, 'Processes the commits that do not belong to a tag')
            [CompletionResult]::new('--topo-order', '--topo-order', [CompletionResultType]::ParameterName, 'Sorts the tags topologically')
            [CompletionResult]::new('--no-exec', '--no-exec', [CompletionResultType]::ParameterName, 'Disables the external command execution')
            [CompletionResult]::new('-x', '-x', [CompletionResultType]::ParameterName, 'Prints changelog context as JSON')
            [CompletionResult]::new('--context', '--context', [CompletionResultType]::ParameterName, 'Prints changelog context as JSON')
            break
        }
    })

    $completions.Where{ $_.CompletionText -like "$wordToComplete*" } |
        Sort-Object -Property ListItemText
}