#!./kitty/launcher/kitty +launch
# License: GPLv3 Copyright: 2022, Kovid Goyal <kovid at kovidgoyal.net>

import io
import json
import os
import subprocess
import sys
from contextlib import contextmanager, suppress
from functools import lru_cache
from typing import Dict, Iterator, List, Set, Tuple, Union

import kitty.constants as kc
from kittens.tui.operations import Mode
from kitty.cli import (
    CompletionSpec, GoOption, go_options_for_seq, parse_option_spec,
    serialize_as_go_string,
)
from kitty.key_encoding import config_mod_map
from kitty.key_names import character_key_name_aliases, functional_key_name_aliases
from kitty.options.types import Options
from kitty.rc.base import RemoteCommand, all_command_names, command_for_name
from kitty.remote_control import global_options_spec
from kitty.rgb import color_names

changed: List[str] = []


# Utils {{{

def serialize_go_dict(x: Union[Dict[str, int], Dict[int, str], Dict[int, int], Dict[str, str]]) -> str:
    ans = []

    def s(x: Union[int, str]) -> str:
        if isinstance(x, int):
            return str(x)
        return f'"{serialize_as_go_string(x)}"'

    for k, v in x.items():
        ans.append(f'{s(k)}: {s(v)}')
    return '{' + ', '.join(ans) + '}'


def replace(template: str, **kw: str) -> str:
    for k, v in kw.items():
        template = template.replace(k, v)
    return template
# }}}


# Completions {{{
def generate_kittens_completion() -> None:
    from kittens.runner import (
        all_kitten_names, get_kitten_cli_docs, get_kitten_wrapper_of,
    )
    for kitten in sorted(all_kitten_names()):
        kn = 'kitten_' + kitten
        print(f'{kn} := plus_kitten.AddSubCommand(&cli.Command{{Name:"{kitten}", Group: "Kittens"}})')
        wof = get_kitten_wrapper_of(kitten)
        if wof:
            print(f'{kn}.ArgCompleter = cli.CompletionForWrapper("{serialize_as_go_string(wof)}")')
            print(f'{kn}.OnlyArgsAllowed = true')
            continue
        kcd = get_kitten_cli_docs(kitten)
        if kcd:
            ospec = kcd['options']
            for opt in go_options_for_seq(parse_option_spec(ospec())[0]):
                print(opt.as_option(kn))
            ac = kcd.get('args_completion')
            if ac is not None:
                print(''.join(ac.as_go_code(kn + '.ArgCompleter', ' = ')))
        else:
            print(f'{kn}.HelpText = ""')


def completion_for_launch_wrappers(*names: str) -> None:
    from kitty.launch import clone_safe_opts, options_spec
    opts = tuple(go_options_for_seq(parse_option_spec(options_spec())[0]))
    allowed = clone_safe_opts()
    for o in opts:
        if o.obj_dict['name'] in allowed:
            for name in names:
                print(o.as_option(name))


def generate_completions_for_kitty() -> None:
    from kitty.config import option_names_for_completion
    print('package completion\n')
    print('import "kitty/tools/cli"')
    print('import "kitty/tools/cmd/tool"')
    print('import "kitty/tools/cmd/at"')
    conf_names = ', '.join((f'"{serialize_as_go_string(x)}"' for x in option_names_for_completion()))
    print('var kitty_option_names_for_completion = []string{' + conf_names + '}')

    print('func kitty(root *cli.Command) {')

    # The kitty exe
    print('k := root.AddSubCommand(&cli.Command{'
          'Name:"kitty", SubCommandIsOptional: true, ArgCompleter: cli.CompleteExecutableFirstArg, SubCommandMustBeFirst: true })')
    print('kt := root.AddSubCommand(&cli.Command{Name:"kitty-tool", SubCommandMustBeFirst: true })')
    print('tool.KittyToolEntryPoints(kt)')
    for opt in go_options_for_seq(parse_option_spec()[0]):
        print(opt.as_option('k'))

    # kitty +
    print('plus := k.AddSubCommand(&cli.Command{Name:"+", Group:"Entry points", ShortDescription: "Various special purpose tools and kittens"})')

    print('plus_launch := plus.AddSubCommand(&cli.Command{'
          'Name:"launch", Group:"Entry points", ShortDescription: "Launch Python scripts", ArgCompleter: complete_plus_launch})')
    print('k.AddClone("", plus_launch).Name = "+launch"')

    print('plus_runpy := plus.AddSubCommand(&cli.Command{'
          'Name: "runpy", Group:"Entry points", ArgCompleter: complete_plus_runpy, ShortDescription: "Run Python code"})')
    print('k.AddClone("", plus_runpy).Name = "+runpy"')

    print('plus_open := plus.AddSubCommand(&cli.Command{'
          'Name:"open", Group:"Entry points", ArgCompleter: complete_plus_open, ShortDescription: "Open files and URLs"})')
    print('for _, og := range k.OptionGroups { plus_open.OptionGroups = append(plus_open.OptionGroups, og.Clone(plus_open)) }')
    print('k.AddClone("", plus_open).Name = "+open"')

    # kitty +kitten
    print('plus_kitten := plus.AddSubCommand(&cli.Command{Name:"kitten", Group:"Kittens", SubCommandMustBeFirst: true})')
    generate_kittens_completion()
    print('k.AddClone("", plus_kitten).Name = "+kitten"')

    # @
    print('at.EntryPoint(k)')

    # clone-in-kitty, edit-in-kitty
    print('cik := root.AddSubCommand(&cli.Command{Name:"clone-in-kitty"})')
    print('eik := root.AddSubCommand(&cli.Command{Name:"edit-in-kitty"})')
    completion_for_launch_wrappers('cik', 'eik')
    print(''.join(CompletionSpec.from_string('type:file mime:text/* group:"Text files"').as_go_code('eik.ArgCompleter', ' = ')))

    print('}')
    print('func init() {')
    print('cli.RegisterExeForCompletion(kitty)')
    print('}')
# }}}


# rc command wrappers {{{
json_field_types: Dict[str, str] = {
    'bool': 'bool', 'str': 'string', 'list.str': '[]string', 'dict.str': 'map[string]string', 'float': 'float64', 'int': 'int',
    'scroll_amount': 'any', 'spacing': 'any', 'colors': 'any',
}


def go_field_type(json_field_type: str) -> str:
    q = json_field_types.get(json_field_type)
    if q:
        return q
    if json_field_type.startswith('choices.'):
        return 'string'
    if '.' in json_field_type:
        p, r = json_field_type.split('.', 1)
        p = {'list': '[]', 'dict': 'map[string]'}[p]
        return p + go_field_type(r)
    raise TypeError(f'Unknown JSON field type: {json_field_type}')


class JSONField:

    def __init__(self, line: str) -> None:
        field_def = line.split(':', 1)[0]
        self.required = False
        self.field, self.field_type = field_def.split('/', 1)
        if self.field.endswith('+'):
            self.required = True
            self.field = self.field[:-1]
        self.struct_field_name = self.field[0].upper() + self.field[1:]

    def go_declaration(self) -> str:
        return self.struct_field_name + ' ' + go_field_type(self.field_type) + f'`json:"{self.field},omitempty"`'


def go_code_for_remote_command(name: str, cmd: RemoteCommand, template: str) -> str:
    template = '\n' + template[len('//go:build exclude'):]
    NO_RESPONSE_BASE = 'false'
    af: List[str] = []
    a = af.append
    af.extend(cmd.args.as_go_completion_code('ans'))
    od: List[str] = []
    option_map: Dict[str, GoOption] = {}
    for o in rc_command_options(name):
        option_map[o.go_var_name] = o
        a(o.as_option('ans'))
        if o.go_var_name in ('NoResponse', 'ResponseTimeout'):
            continue
        od.append(o.struct_declaration())
    jd: List[str] = []
    json_fields = []
    field_types: Dict[str, str] = {}
    for line in cmd.protocol_spec.splitlines():
        line = line.strip()
        if ':' not in line:
            continue
        f = JSONField(line)
        json_fields.append(f)
        field_types[f.field] = f.field_type
        jd.append(f.go_declaration())
    jc: List[str] = []
    handled_fields: Set[str] = set()
    jc.extend(cmd.args.as_go_code(name, field_types, handled_fields))

    unhandled = {}
    used_options = set()
    for field in json_fields:
        oq = (cmd.field_to_option_map or {}).get(field.field, field.field)
        oq = ''.join(x.capitalize() for x in oq.split('_'))
        if oq in option_map:
            o = option_map[oq]
            used_options.add(oq)
            jc.append(f'payload.{field.struct_field_name} = options_{name}.{o.go_var_name}')
        elif field.field in handled_fields:
            pass
        else:
            unhandled[field.field] = field
    for x in tuple(unhandled):
        if x == 'match_window' and 'Match' in option_map and 'Match' not in used_options:
            used_options.add('Match')
            o = option_map['Match']
            field = unhandled[x]
            jc.append(f'payload.{field.struct_field_name} = options_{name}.{o.go_var_name}')
            del unhandled[x]
    if unhandled:
        raise SystemExit(f'Cant map fields: {", ".join(unhandled)} for cmd: {name}')
    if name != 'send_text':
        unused_options = set(option_map) - used_options - {'NoResponse', 'ResponseTimeout'}
        if unused_options:
            raise SystemExit(f'Unused options: {", ".join(unused_options)} for command: {name}')

    argspec = cmd.args.spec
    if argspec:
        argspec = ' ' + argspec
    ans = replace(
        template,
        CMD_NAME=name, __FILE__=__file__, CLI_NAME=name.replace('_', '-'),
        SHORT_DESC=serialize_as_go_string(cmd.short_desc),
        LONG_DESC=serialize_as_go_string(cmd.desc.strip()),
        IS_ASYNC='true' if cmd.is_asynchronous else 'false',
        NO_RESPONSE_BASE=NO_RESPONSE_BASE, ADD_FLAGS_CODE='\n'.join(af),
        WAIT_TIMEOUT=str(cmd.response_timeout),
        OPTIONS_DECLARATION_CODE='\n'.join(od),
        JSON_DECLARATION_CODE='\n'.join(jd),
        JSON_INIT_CODE='\n'.join(jc), ARGSPEC=argspec,
        STRING_RESPONSE_IS_ERROR='true' if cmd.string_return_is_error else 'false',
        STREAM_WANTED='true' if cmd.reads_streaming_data else 'false',
    )
    return ans
# }}}


# Constants {{{
def generate_color_names() -> str:
    return 'package style\n\nvar ColorNames = map[string]RGBA{' + '\n'.join(
        f'\t"{name}": RGBA{{ Red:{val.red}, Green:{val.green}, Blue:{val.blue} }},'
        for name, val in color_names.items()
    ) + '\n}' + '\n\nvar ColorTable = [256]uint32{' + ', '.join(
        f'{x}' for x in Options.color_table) + '}\n'


def load_ref_map() -> Dict[str, Dict[str, str]]:
    with open('kitty/docs_ref_map_generated.h') as f:
        raw = f.read()
    raw = raw.split('{', 1)[1].split('}', 1)[0]
    data = json.loads(bytes(bytearray(json.loads(f'[{raw}]'))))
    return data  # type: ignore


def generate_constants() -> str:
    ref_map = load_ref_map()
    dp = ", ".join(map(lambda x: f'"{serialize_as_go_string(x)}"', kc.default_pager_for_help))
    return f'''\
package kitty

type VersionType struct {{
    Major, Minor, Patch int
}}
const VersionString string = "{kc.str_version}"
const WebsiteBaseURL string = "{kc.website_base_url}"
const VCSRevision string = ""
const RC_ENCRYPTION_PROTOCOL_VERSION string = "{kc.RC_ENCRYPTION_PROTOCOL_VERSION}"
const IsFrozenBuild bool = false
const HandleTermiosSignals = {Mode.HANDLE_TERMIOS_SIGNALS.value[0]}
var Version VersionType = VersionType{{Major: {kc.version.major}, Minor: {kc.version.minor}, Patch: {kc.version.patch},}}
var DefaultPager []string = []string{{ {dp} }}
var FunctionalKeyNameAliases = map[string]string{serialize_go_dict(functional_key_name_aliases)}
var CharacterKeyNameAliases = map[string]string{serialize_go_dict(character_key_name_aliases)}
var ConfigModMap = map[string]uint16{serialize_go_dict(config_mod_map)}
var RefMap = map[string]string{serialize_go_dict(ref_map['ref'])}
var DocTitleMap = map[string]string{serialize_go_dict(ref_map['doc'])}
'''  # }}}


# Boilerplate {{{

@contextmanager
def replace_if_needed(path: str, show_diff: bool = False) -> Iterator[io.StringIO]:
    buf = io.StringIO()
    yield buf
    orig = ''
    with suppress(FileNotFoundError), open(path, 'r') as f:
        orig = f.read()
    new = buf.getvalue()
    new = f'// Code generated by {os.path.basename(__file__)}; DO NOT EDIT.\n\n' + new
    if orig != new:
        changed.append(path)
        if show_diff:
            with open(path + '.new', 'w') as f:
                f.write(new)
                subprocess.run(['diff', '-Naurp', path, f.name], stdout=open('/dev/tty', 'w'))
                os.remove(f.name)
        with open(path, 'w') as f:
            f.write(new)


@lru_cache(maxsize=256)
def rc_command_options(name: str) -> Tuple[GoOption, ...]:
    cmd = command_for_name(name)
    return tuple(go_options_for_seq(parse_option_spec(cmd.options_spec or '\n\n')[0]))


def update_at_commands() -> None:
    with open('tools/cmd/at/template.go') as f:
        template = f.read()
    for name in all_command_names():
        cmd = command_for_name(name)
        code = go_code_for_remote_command(name, cmd, template)
        dest = f'tools/cmd/at/cmd_{name}_generated.go'
        with replace_if_needed(dest) as f:
            f.write(code)
    struct_def = []
    opt_def = []
    for o in go_options_for_seq(parse_option_spec(global_options_spec())[0]):
        struct_def.append(o.struct_declaration())
        opt_def.append(o.as_option(depth=1, group="Global options"))
    sdef = '\n'.join(struct_def)
    odef = '\n'.join(opt_def)
    code = f'''
package at
import "kitty/tools/cli"
type rc_global_options struct {{
{sdef}
}}
var rc_global_opts rc_global_options

func add_rc_global_opts(cmd *cli.Command) {{
{odef}
}}
'''
    with replace_if_needed('tools/cmd/at/global_opts_generated.go') as f:
        f.write(code)


def update_completion() -> None:
    orig = sys.stdout
    try:
        with replace_if_needed('tools/cmd/completion/kitty_generated.go') as f:
            sys.stdout = f
            generate_completions_for_kitty()
    finally:
        sys.stdout = orig


def generate_readline_actions() -> str:
    actions = []
    for x in '''\
        ActionNil

        ActionBackspace
        ActionDelete
        ActionMoveToStartOfLine
        ActionMoveToEndOfLine
        ActionMoveToStartOfDocument
        ActionMoveToEndOfDocument
        ActionMoveToEndOfWord
        ActionMoveToStartOfWord
        ActionCursorLeft
        ActionCursorRight
        ActionEndInput
        ActionAcceptInput
        ActionCursorUp
        ActionHistoryPreviousOrCursorUp
        ActionCursorDown
        ActionHistoryNextOrCursorDown
        ActionHistoryNext
        ActionHistoryPrevious
        ActionHistoryFirst
        ActionHistoryLast
        ActionHistoryIncrementalSearchBackwards
        ActionHistoryIncrementalSearchForwards
        ActionTerminateHistorySearchAndApply
        ActionTerminateHistorySearchAndRestore
        ActionClearScreen
        ActionAddText
        ActionAbortCurrentLine

        ActionStartKillActions
        ActionKillToEndOfLine
        ActionKillToStartOfLine
        ActionKillNextWord
        ActionKillPreviousWord
        ActionKillPreviousSpaceDelimitedWord
        ActionEndKillActions
        ActionYank
        ActionPopYank

        ActionNumericArgumentDigit0
        ActionNumericArgumentDigit1
        ActionNumericArgumentDigit2
        ActionNumericArgumentDigit3
        ActionNumericArgumentDigit4
        ActionNumericArgumentDigit5
        ActionNumericArgumentDigit6
        ActionNumericArgumentDigit7
        ActionNumericArgumentDigit8
        ActionNumericArgumentDigit9
        ActionNumericArgumentDigitMinus
    '''.splitlines():
        x = x.strip()
        if x:
            actions.append(x)
    ans = ['package readline', 'import "strconv"', 'type Action uint', 'const (']
    stringer = ['func (ac Action) String() string {', 'switch(ac) {']
    for i, ac in enumerate(actions):
        stringer.append(f'case {ac}: return "{ac}"')
        if i == 0:
            ac = ac + ' Action = iota'
        ans.append(ac)
    ans.append(')')
    stringer.append('}\nreturn strconv.Itoa(int(ac)) }')
    return '\n'.join(ans + stringer)


def main() -> None:
    with replace_if_needed('constants_generated.go') as f:
        f.write(generate_constants())
    with replace_if_needed('tools/utils/style/color-names_generated.go') as f:
        f.write(generate_color_names())
    with replace_if_needed('tools/tui/readline/actions_generated.go') as f:
        f.write(generate_readline_actions())
    update_completion()
    update_at_commands()
    print(json.dumps(changed, indent=2))


if __name__ == '__main__':
    main()  # }}}