use builtin;
use str;

set edit:completion:arg-completer[complate] = {|@words|
    fn spaces {|n|
        builtin:repeat $n ' ' | str:join ''
    }
    fn cand {|text desc|
        edit:complex-candidate $text &display=$text' '(spaces (- 14 (wcswidth $text)))$desc
    }
    var command = 'complate'
    for word $words[1..-1] {
        if (str:has-prefix $word '-') {
            break
        }
        set command = $command';'$word
    }
    var completions = [
        &'complate'= {
            cand -e 'enables experimental features'
            cand --experimental 'enables experimental features'
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
            cand man 'Renders the manual.'
            cand autocomplete 'Renders shell completion scripts.'
            cand init 'Initializes a dummy default configuration in "./.complate/config.yaml".'
            cand schema 'Renders the configuration schema.'
            cand render 'Renders a template by replacing values as specified by the configuration.'
            cand help 'Print this message or the help of the given subcommand(s)'
        }
        &'complate;man'= {
            cand -o 'o'
            cand --out 'out'
            cand -f 'f'
            cand --format 'format'
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
        }
        &'complate;autocomplete'= {
            cand -o 'o'
            cand --out 'out'
            cand -s 's'
            cand --shell 'shell'
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
        }
        &'complate;init'= {
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
        }
        &'complate;schema'= {
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
        }
        &'complate;render'= {
            cand -c 'The configuration file to use.'
            cand --config 'The configuration file to use.'
            cand -t 'Specify the template to use from the config and skip it''s selection.'
            cand --template 'Specify the template to use from the config and skip it''s selection.'
            cand -b 'The execution backend (cli=native-terminal, ui=ui emulator in terminal).'
            cand --backend 'The execution backend (cli=native-terminal, ui=ui emulator in terminal).'
            cand -v 'Overrides a certain value definition with a string.'
            cand --value 'Overrides a certain value definition with a string.'
            cand --trust 'Enables the shell command execution. This is potentially insecure and should only be done for trustworthy sources.'
            cand -l 'Defines that the templating is done in non-strict mode (allow missing value for variable).'
            cand --loose 'Defines that the templating is done in non-strict mode (allow missing value for variable).'
            cand -h 'Print help'
            cand --help 'Print help'
            cand -V 'Print version'
            cand --version 'Print version'
        }
        &'complate;help'= {
            cand man 'Renders the manual.'
            cand autocomplete 'Renders shell completion scripts.'
            cand init 'Initializes a dummy default configuration in "./.complate/config.yaml".'
            cand schema 'Renders the configuration schema.'
            cand render 'Renders a template by replacing values as specified by the configuration.'
            cand help 'Print this message or the help of the given subcommand(s)'
        }
        &'complate;help;man'= {
        }
        &'complate;help;autocomplete'= {
        }
        &'complate;help;init'= {
        }
        &'complate;help;schema'= {
        }
        &'complate;help;render'= {
        }
        &'complate;help;help'= {
        }
    ]
    $completions[$command]
}