import gradio as gr
import json
import posixpath
from fastapi import HTTPException, Path, Query, Request
from fastapi.responses import StreamingResponse
from gradio_huggingfacehub_search import HuggingfaceHubSearch
from huggingface_hub import HfApi, HfFileSystem
from typing import Annotated, Any, NamedTuple
from urllib.parse import urlencode

from _hf_explorer import FileExplorer
from _hf_gguf import standard_metadata, GGUFValueType, HuggingGGUFstream


hfapi = HfApi()


class MetadataState(NamedTuple):
    var: dict[str, Any]
    key: dict[str, tuple[int, Any]]
    add: dict[str, Any]
    rem: set


def init_state(
):
    return MetadataState(
        var = {},
        key = {},
        add = {},
        rem = set(),
    )


def human_readable_metadata(
    typ: int,
    val: Any,
) -> tuple[str, Any]:
    typ = GGUFValueType(typ).name

    if typ == 'ARRAY':
        val = '[[...], ...]'
    elif isinstance(val, list):
        typ = f'[{typ}][{len(val)}]'

        if len(val) > 8:
            val = str(val[:8])[:-1] + ', ...]'
        else:
            val = str(val)

    return typ, val


with gr.Blocks(
) as blocks:
    with gr.Row():
        hf_search = HuggingfaceHubSearch(
            label = "Search Huggingface Hub",
            placeholder = "Search for models on Huggingface",
            search_type = "model",
            sumbit_on_select = True,
            scale = 2,
        )

        hf_branch = gr.Dropdown(
            None,
            label = "Branch",
            scale = 1,
        )

        gr.LoginButton(
            "Sign in to access gated/private repos",
            scale = 1,
        )

    hf_file = FileExplorer(
        visible=False,
    )

    with gr.Row():
        with gr.Column():
            meta_keys = gr.Dropdown(
                None,
                label = "Modify Metadata",
                allow_custom_value = True,
                visible = False,
            )

        with gr.Column():
            meta_types = gr.Dropdown(
                [e.name for e in GGUFValueType],
                label = "Metadata Type",
                type = "index",
                visible = False,
            )

        with gr.Column():
            btn_delete = gr.Button(
                "Remove Key",
                variant = 'stop',
                visible = False,
            )

    meta_boolean = gr.Checkbox(
        visible = False,
    )

    with gr.Row():
        # Too slow unfortunately, needs a proper search box
        # meta_lookup = gr.Dropdown(
        #     label = 'Lookup token',
        #     type = 'index',
        #     visible = False,
        # )

        meta_number = gr.Number(
            visible = False,
        )

    meta_string = gr.Textbox(
        visible = False,
    )

    meta_array = gr.Matrix(
        None,
        label = "Unsupported",
        row_count = (1, 'fixed'),
        height = "1rem",
        interactive = False,
        visible = False,
    )

    meta_changes = gr.HighlightedText(
        None,
        label = "Metadata Changes",
        color_map = {'add': 'green', 'rem': 'red'},
        interactive = False,
        visible = False,
    )

    btn_download = gr.Button(
        "Download GGUF",
        variant = "primary",
        visible = False,
    )

    file_meta = gr.Matrix(
        None,
        col_count = (3, "fixed"),
        headers = [
            "Metadata Name",
            "Type",
            "Value",
        ],
        datatype = ["str", "str", "str"],
        column_widths = ["35%", "15%", "50%"],
        wrap = True,
        interactive = False,
        visible = False,
    )

    meta_state = gr.State() # init_state
    # BUG: For some reason using gr.State initial value turns tuple to list?
    meta_state.value = init_state()

    file_change_components = [
        meta_changes,
        file_meta,
        meta_keys,
        btn_download,
    ]
    state_change_components = [
        meta_state,
    ] + file_change_components


    @gr.on(
        triggers = [
            hf_search.submit,
        ],
        inputs = [
            hf_search,
        ],
        outputs = [
            hf_branch,
        ],
    )
    def get_branches(
        repo: str,
        oauth_token: gr.OAuthToken | None = None,
    ):
        branches = []

        try:
            refs = hfapi.list_repo_refs(
                repo,
                token = oauth_token.token if oauth_token else False,
            )
            branches = [b.name for b in refs.branches]
        except Exception as e:
            raise gr.Error(e)

        return {
            hf_branch: gr.Dropdown(
                branches or None,
                value = "main" if "main" in branches else None,
            ),
        }


    @gr.on(
        triggers = [
            hf_search.submit,
            hf_branch.input,
        ],
        inputs = [
            hf_search,
            hf_branch,
        ],
        outputs = [
            hf_file,
        ] + file_change_components,
    )
    def get_files(
        repo: str,
        branch: str | None,
        oauth_token: gr.OAuthToken | None = None,
    ):
        return {
            hf_file: FileExplorer(
                "**/*.gguf",
                file_count = "single",
                root_dir = repo,
                branch = branch,
                token = oauth_token.token if oauth_token else None,
                visible = True,
            ),
            meta_changes: gr.HighlightedText(
                None,
                visible = False,
            ),
            file_meta: gr.Matrix(
                # None, # FIXME (see Dataframe bug below)
                visible = False,
            ),
            meta_keys: gr.Dropdown(
                None,
                visible = False,
            ),
            btn_download: gr.Button(
                visible = False,
            ),
        }


    @gr.on(
        triggers = [
            hf_file.change,
        ],
        inputs = [
            hf_file,
            hf_branch,
        ],
        outputs = [
            meta_state,
        ] + file_change_components,
        show_progress = 'minimal',
    )
    def load_metadata(
        repo_file: str | None,
        branch: str | None,
        progress: gr.Progress = gr.Progress(),
        oauth_token: gr.OAuthToken | None = None,
    ):
        m = []
        meta = init_state()

        yield {
            meta_state: meta,
            file_meta: gr.Matrix(
                [['', '', '']] * 100, # FIXME: Workaround for Dataframe bug when user has selected data
                visible = True,
            ),
            meta_changes: gr.HighlightedText(
                None,
                visible = False,
            ),
            meta_keys: gr.Dropdown(
                None,
                visible = False,
            ),
            btn_download: gr.Button(
                visible = False,
            ),
        }

        if not repo_file:
            return

        fs = HfFileSystem(
            token = oauth_token.token if oauth_token else None,
        )

        try:
            progress(0, desc = 'Loading file...')
            with fs.open(
                repo_file,
                "rb",
                revision = branch,
                block_size = 8 * 1024 * 1024,
                cache_type = "readahead",
            ) as fp:
                progress(0, desc = 'Reading header...')
                gguf = HuggingGGUFstream(fp)
                num_metadata = gguf.header['metadata'].value
                metadata = gguf.read_metadata()

                meta.var['repo_file'] = repo_file
                meta.var['branch'] = branch

                for k, v in progress.tqdm(metadata, desc = 'Reading metadata...', total = num_metadata, unit = f' of {num_metadata} metadata keys...'):
                    m.append([k, *human_readable_metadata(v.type, v.value)])
                    meta.key[k] = (v.type, v.value)

                    # FIXME
                    # yield {
                    #     file_meta: gr.Matrix(
                    #         m,
                    #     ),
                    # }
        except Exception as e:
            raise gr.Error(e)

        yield {
            meta_state: meta,
            file_meta: gr.Matrix(
                m,
            ),
            meta_keys: gr.Dropdown(
                sorted(meta.key.keys() | standard_metadata.keys()),
                value = '',
                visible = True,
            ),
        }


    @gr.on(
        triggers = [
            meta_keys.change,
        ],
        inputs = [
            meta_state,
            meta_keys,
        ],
        outputs = [
            meta_types,
            btn_delete,
        ],
    )
    def update_metakey(
        meta: MetadataState,
        key: str | None,
    ):
        typ = None
        if (val := meta.key.get(key, standard_metadata.get(key))) is not None:
            typ = GGUFValueType(val[0]).name
        elif key and key.startswith('tokenizer.chat_template.'):
            typ = GGUFValueType.STRING.name

        return {
            meta_types: gr.Dropdown(
                value = typ,
                interactive = False if key in meta.key else True,
                visible = True if key else False,
            ),
            btn_delete: gr.Button(
                visible = True if key in meta.key else False,
            ),
        }


    @gr.on(
        triggers = [
            meta_keys.change,
            meta_types.input,
        ],
        inputs = [
            meta_state,
            meta_keys,
            meta_types,
        ],
        outputs = [
            meta_boolean,
            meta_number,
            meta_string,
            meta_array,
        ],
    )
    def update_metatype(
        meta: MetadataState,
        key: str,
        typ: int,
    ):
        val = None
        if (data := meta.key.get(key, standard_metadata.get(key))) is not None:
            typ = data[0]
            val = data[1]
        elif not key:
            typ = None

        if isinstance(val, list):
            # TODO: Support arrays?
            typ = GGUFValueType.ARRAY

        match typ:
            case GGUFValueType.INT8 | GGUFValueType.INT16 | GGUFValueType.INT32 | GGUFValueType.INT64 | GGUFValueType.UINT8 | GGUFValueType.UINT16 | GGUFValueType.UINT32 | GGUFValueType.UINT64 | GGUFValueType.FLOAT32 | GGUFValueType.FLOAT64:
                is_number = True
            case _:
                is_number = False

        return {
            meta_boolean: gr.Checkbox(
                value = val if typ == GGUFValueType.BOOL and data is not None else False,
                visible = True if typ == GGUFValueType.BOOL else False,
            ),
            meta_number: gr.Number(
                value = val if is_number and data is not None else 0,
                precision = 10 if typ == GGUFValueType.FLOAT32 or typ == GGUFValueType.FLOAT64 else 0,
                visible = True if is_number else False,
            ),
            meta_string: gr.Textbox(
                value = val if typ == GGUFValueType.STRING else '',
                visible = True if typ == GGUFValueType.STRING else False,
            ),
            meta_array: gr.Matrix(
                visible = True if typ == GGUFValueType.ARRAY else False,
            ),
        }


    # FIXME: Disabled for now due to Dataframe bug when user has selected data
    # @gr.on(
    #     triggers = [
    #         file_meta.select,
    #     ],
    #     inputs = [
    #     ],
    #     outputs = [
    #         meta_keys,
    #     ],
    # )
    # def select_metakey(
    #     evt: gr.SelectData,
    # ):
    #     return {
    #         meta_keys: gr.Dropdown(
    #             value = evt.row_value[0] if evt.selected else '',
    #         ),
    #     }


    def notify_state_change(
        meta: MetadataState,
        request: gr.Request,
    ):
        changes = [(k, 'rem') for k in meta.rem]

        for k, v in meta.add.items():
            changes.append((k, 'add'))
            changes.append((str(v[1]), None))

        m = []
        for k, v in meta.key.items():
            m.append([k, *human_readable_metadata(v[0], v[1])])

        link = str(request.request.url_for('download', repo_file = meta.var['repo_file']).include_query_params(branch = meta.var['branch']))
        if meta.rem or meta.add:
            link += '&' + urlencode(
                {
                    'rem': meta.rem,
                    'add': [json.dumps([k, *v], ensure_ascii = False) for k, v in meta.add.items()],
                },
                doseq = True,
                safe = '[]{}:"\',',
            )

        return {
            meta_state: meta,
            meta_changes: gr.HighlightedText(
                changes,
                visible = True if changes else False,
            ),
            file_meta: gr.Matrix(
                m,
            ),
            meta_keys: gr.Dropdown(
                sorted(meta.key.keys() | standard_metadata.keys()),
                value = '',
            ),
            btn_download: gr.Button(
                link = link,
                visible = True if changes else False,
            ),
        }


    @gr.on(
        triggers = [
            btn_delete.click,
        ],
        inputs = [
            meta_state,
            meta_keys,
        ],
        outputs = [
        ] + state_change_components,
    )
    def rem_metadata(
        meta: MetadataState,
        key: str,
        request: gr.Request,
    ):
        if key in meta.add:
            del meta.add[key]

        if key in meta.key:
            del meta.key[key]

        meta.rem.add(key)

        return notify_state_change(
            meta,
            request,
        )


    def add_metadata(
        meta: MetadataState,
        key: str,
        typ: int | None,
        val: Any,
        request: gr.Request,
    ):
        if not key or typ is None:
            if key:
                gr.Warning('Missing required value type')

            return {
                meta_changes: gr.HighlightedText(
                )
            }

        if key in meta.rem:
            meta.rem.remove(key)

        meta.key[key] = meta.add[key] = (typ, val)

        if key.startswith('tokenizer.chat_template.'):
            template = key[24:]
            if template not in meta.key.get('tokenizer.chat_templates', []):
                templates = [x[24:] for x in meta.key.keys() if x.startswith('tokenizer.chat_template.')]
                meta.key['tokenizer.chat_templates'] = meta.add['tokenizer.chat_templates'] = (GGUFValueType.STRING, templates)

        return notify_state_change(
            meta,
            request,
        )


    meta_boolean.input(
        add_metadata,
        inputs = [
            meta_state,
            meta_keys,
            meta_types,
            meta_boolean,
        ],
        outputs = [
        ] + state_change_components,
    )

    # meta_lookup.input(
    #     lambda token: gr.Number(value = token),
    #     inputs = meta_lookup,
    #     outputs = meta_number,
    # )

    meta_number.submit(
        add_metadata,
        inputs = [
            meta_state,
            meta_keys,
            meta_types,
            meta_number,
        ],
        outputs = [
        ] + state_change_components,
    )

    meta_string.submit(
        add_metadata,
        inputs = [
            meta_state,
            meta_keys,
            meta_types,
            meta_string,
        ],
        outputs = [
        ] + state_change_components,
    )

    meta_array.input(
        add_metadata,
        inputs = [
            meta_state,
            meta_keys,
            meta_types,
            meta_array,
        ],
        outputs = [
        ] + state_change_components,
    )


def stream_repo_file(
    repo_file: str,
    branch: str,
    add_meta: list[str] | None,
    rem_meta: list[str] | None,
    token: str | None = None,
):
    fs = HfFileSystem(
        token = token,
    )

    with fs.open(
        repo_file,
        "rb",
        revision = branch,
        block_size = 8 * 1024 * 1024,
        cache_type = "readahead",
    ) as fp:
        if not rem_meta:
            rem_meta = []

        if not add_meta:
            add_meta = []

        gguf = HuggingGGUFstream(fp)
        for _ in gguf.read_metadata():
            pass

        for k in rem_meta:
            gguf.remove_metadata(k)

        for k in add_meta:
            k = json.loads(k)
            if isinstance(k, list) and len(k) == 3:
                gguf.add_metadata(*k)

        yield gguf.filesize

        yield b''.join((v.data for k, v in gguf.header.items()))

        for k, v in gguf.metadata.items():
            yield v.data

        while True:
            if not (data := fp.read(65536)):
                break

            yield data


if __name__ == "__main__":
    blocks.queue(
        max_size = 10,
        default_concurrency_limit = 10,
    )
    app, local_url, share_url = blocks.launch(
        show_api = False,
        prevent_thread_lock = True,
    )

    async def download(
        request: Request,
        repo_file: Annotated[str, Path()],
        branch: Annotated[str, Query()] = "main",
        add: Annotated[list[str] | None, Query()] = None,
        rem: Annotated[list[str] | None, Query()] = None,
    ):
        token = request.session.get('oauth_info', {}).get('access_token')

        if posixpath.normpath(repo_file) != repo_file or '\\' in repo_file or repo_file.startswith('../') or repo_file.startswith('/') or repo_file.count('/') < 2:
            raise HTTPException(
                status_code = 404,
                detail = 'Invalid repository',
            )

        stream = stream_repo_file(
            repo_file,
            branch,
            add,
            rem,
            token = token,
        )
        size = next(stream)

        return StreamingResponse(
            stream,
            headers = {
                'Content-Length': str(size),
            },
            media_type = 'application/octet-stream',
        )

    app.add_api_route(
        "/download/{repo_file:path}",
        download,
        methods = ["GET"],
    )
    # app.openapi_schema = None
    # app.setup()
    blocks.block_thread()