__package__ = 'archivebox.index'

import os
from pathlib import Path

from datetime import datetime, timedelta

from typing import List, Dict, Any, Optional, Union

from dataclasses import dataclass, asdict, field, fields


from ..system import get_dir_size

from ..config import OUTPUT_DIR, ARCHIVE_DIR_NAME

class ArchiveError(Exception):
    def __init__(self, message, hints=None):
        super().__init__(message)
        self.hints = hints

LinkDict = Dict[str, Any]

ArchiveOutput = Union[str, Exception, None]

@dataclass(frozen=True)
class ArchiveResult:
    cmd: List[str]
    pwd: Optional[str]
    cmd_version: Optional[str]
    output: ArchiveOutput
    status: str
    start_ts: datetime
    end_ts: datetime
    schema: str = 'ArchiveResult'

    def __post_init__(self):
        self.typecheck()

    def _asdict(self):
        return asdict(self)

    def typecheck(self) -> None:
        assert self.schema == self.__class__.__name__
        assert isinstance(self.status, str) and self.status
        assert isinstance(self.start_ts, datetime)
        assert isinstance(self.end_ts, datetime)
        assert isinstance(self.cmd, list)
        assert all(isinstance(arg, str) and arg for arg in self.cmd)
        assert self.pwd is None or isinstance(self.pwd, str) and self.pwd
        assert self.cmd_version is None or isinstance(self.cmd_version, str) and self.cmd_version
        assert self.output is None or isinstance(self.output, (str, Exception))
        if isinstance(self.output, str):
            assert self.output

    @classmethod
    def guess_ts(_cls, dict_info):
        from ..util import parse_date
        parsed_timestamp = parse_date(dict_info["timestamp"])
        start_ts = parsed_timestamp
        end_ts = parsed_timestamp + timedelta(seconds=int(dict_info["duration"]))
        return start_ts, end_ts

    @classmethod
    def from_json(cls, json_info, guess=False):
        from ..util import parse_date

        info = {
            key: val
            for key, val in json_info.items()
            if key in cls.field_names()
        }
        if guess:
            keys = info.keys()
            if "start_ts" not in keys:
                info["start_ts"], info["end_ts"] = cls.guess_ts(json_info)
            else:
                info['start_ts'] = parse_date(info['start_ts'])
                info['end_ts'] = parse_date(info['end_ts'])
            if "pwd" not in keys:
                info["pwd"] = str(Path(OUTPUT_DIR) / ARCHIVE_DIR_NAME / json_info["timestamp"])
            if "cmd_version" not in keys:
                info["cmd_version"] = "Undefined"
            if "cmd" not in keys:
                info["cmd"] = []
        else:
            info['start_ts'] = parse_date(info['start_ts'])
            info['end_ts'] = parse_date(info['end_ts'])
            info['cmd_version'] = info.get('cmd_version')
        if type(info["cmd"]) is str:
            info["cmd"] = [info["cmd"]]
        return cls(**info)

    def to_dict(self, *keys) -> dict:
        if keys:
            return {k: v for k, v in asdict(self).items() if k in keys}
        return asdict(self)

    def to_json(self, indent=4, sort_keys=True) -> str:
        from .json import to_json

        return to_json(self, indent=indent, sort_keys=sort_keys)

    def to_csv(self, cols: Optional[List[str]]=None, separator: str=',', ljust: int=0) -> str:
        from .csv import to_csv

        return to_csv(self, csv_col=cols or self.field_names(), separator=separator, ljust=ljust)
    
    @classmethod
    def field_names(cls):
        return [f.name for f in fields(cls)]

    @property
    def duration(self) -> int:
        return (self.end_ts - self.start_ts).seconds

@dataclass(frozen=True)
class Link:
    timestamp: str
    url: str
    title: Optional[str]
    tags: Optional[str]
    sources: List[str]
    history: Dict[str, List[ArchiveResult]] = field(default_factory=lambda: {})
    updated: Optional[datetime] = None
    schema: str = 'Link'


    def __str__(self) -> str:
        return f'[{self.timestamp}] {self.url} "{self.title}"'

    def __post_init__(self):
        self.typecheck()

    def overwrite(self, **kwargs):
        """pure functional version of dict.update that returns a new instance"""
        return Link(**{**self._asdict(), **kwargs})

    def __eq__(self, other):
        if not isinstance(other, Link):
            return NotImplemented
        return self.url == other.url

    def __gt__(self, other):
        if not isinstance(other, Link):
            return NotImplemented
        if not self.timestamp or not other.timestamp:
            return 
        return float(self.timestamp) > float(other.timestamp)

    def typecheck(self) -> None:
        from ..config import stderr, ANSI
        try:
            assert self.schema == self.__class__.__name__
            assert isinstance(self.timestamp, str) and self.timestamp
            assert self.timestamp.replace('.', '').isdigit()
            assert isinstance(self.url, str) and '://' in self.url
            assert self.updated is None or isinstance(self.updated, datetime)
            assert self.title is None or (isinstance(self.title, str) and self.title)
            #for tag in self.tags.all():
            #    assert tag is None or isinstance(tag, TaggedItem)
            assert isinstance(self.sources, list)
            assert all(isinstance(source, str) and source for source in self.sources)
            assert isinstance(self.history, dict)
            for method, results in self.history.items():
                assert isinstance(method, str) and method
                assert isinstance(results, list)
                assert all(isinstance(result, ArchiveResult) for result in results)
        except Exception:
            stderr('{red}[X] Error while loading link! [{}] {} "{}"{reset}'.format(self.timestamp, self.url, self.title, **ANSI))
            raise
    
    def _asdict(self, extended=False):
        info = {
            'schema': 'Link',
            'url': self.url,
            'title': self.title or None,
            'timestamp': self.timestamp,
            'updated': self.updated or None,
            'tags': self.tags or None,
            'sources': self.sources or [],
            'history': self.history or {},
        }
        if extended:
            info.update({
                'link_dir': self.link_dir,
                'archive_path': self.archive_path,
                
                'hash': self.url_hash,
                'base_url': self.base_url,
                'scheme': self.scheme,
                'domain': self.domain,
                'path': self.path,
                'basename': self.basename,
                'extension': self.extension,
                'is_static': self.is_static,

                'bookmarked_date': self.bookmarked_date,
                'updated_date': self.updated_date,
                'oldest_archive_date': self.oldest_archive_date,
                'newest_archive_date': self.newest_archive_date,
        
                'is_archived': self.is_archived,
                'num_outputs': self.num_outputs,
                'num_failures': self.num_failures,
                
                'latest': self.latest_outputs(),
                'canonical': self.canonical_outputs(),
            })
        return info

    @classmethod
    def from_json(cls, json_info, guess=False):
        from ..util import parse_date
        
        info = {
            key: val
            for key, val in json_info.items()
            if key in cls.field_names()
        }
        info['updated'] = parse_date(info.get('updated'))
        info['sources'] = info.get('sources') or []

        json_history = info.get('history') or {}
        cast_history = {}

        for method, method_history in json_history.items():
            cast_history[method] = []
            for json_result in method_history:
                assert isinstance(json_result, dict), 'Items in Link["history"][method] must be dicts'
                cast_result = ArchiveResult.from_json(json_result, guess)
                cast_history[method].append(cast_result)

        info['history'] = cast_history
        return cls(**info)

    def to_json(self, indent=4, sort_keys=True) -> str:
        from .json import to_json

        return to_json(self, indent=indent, sort_keys=sort_keys)

    def to_csv(self, cols: Optional[List[str]]=None, separator: str=',', ljust: int=0) -> str:
        from .csv import to_csv

        return to_csv(self, cols=cols or self.field_names(), separator=separator, ljust=ljust)

    @classmethod
    def field_names(cls):
        return [f.name for f in fields(cls)]

    @property
    def link_dir(self) -> str:
        from ..config import CONFIG
        return os.path.join(CONFIG['ARCHIVE_DIR'], self.timestamp)

    @property
    def archive_path(self) -> str:
        from ..config import ARCHIVE_DIR_NAME
        return '{}/{}'.format(ARCHIVE_DIR_NAME, self.timestamp)
    
    @property
    def archive_size(self) -> float:
        try:
            return get_dir_size(self.archive_path)[0]
        except Exception:
            return 0

    ### URL Helpers
    @property
    def url_hash(self):
        from ..util import hashurl

        return hashurl(self.url)

    @property
    def scheme(self) -> str:
        from ..util import scheme
        return scheme(self.url)

    @property
    def extension(self) -> str:
        from ..util import extension
        return extension(self.url)

    @property
    def domain(self) -> str:
        from ..util import domain
        return domain(self.url)

    @property
    def path(self) -> str:
        from ..util import path
        return path(self.url)

    @property
    def basename(self) -> str:
        from ..util import basename
        return basename(self.url)

    @property
    def base_url(self) -> str:
        from ..util import base_url
        return base_url(self.url)

    ### Pretty Printing Helpers
    @property
    def bookmarked_date(self) -> Optional[str]:
        from ..util import ts_to_date

        max_ts = (datetime.now() + timedelta(days=30)).timestamp()

        if self.timestamp and self.timestamp.replace('.', '').isdigit():
            if 0 < float(self.timestamp) < max_ts:
                return ts_to_date(datetime.fromtimestamp(float(self.timestamp)))
            else:
                return str(self.timestamp)
        return None


    @property
    def updated_date(self) -> Optional[str]:
        from ..util import ts_to_date
        return ts_to_date(self.updated) if self.updated else None

    @property
    def archive_dates(self) -> List[datetime]:
        return [
            result.start_ts
            for method in self.history.keys()
                for result in self.history[method]
        ]

    @property
    def oldest_archive_date(self) -> Optional[datetime]:
        return min(self.archive_dates, default=None)

    @property
    def newest_archive_date(self) -> Optional[datetime]:
        return max(self.archive_dates, default=None)

    ### Archive Status Helpers
    @property
    def num_outputs(self) -> int:
        return len(tuple(filter(None, self.latest_outputs().values())))

    @property
    def num_failures(self) -> int:
        return sum(1
                   for method in self.history.keys()
                       for result in self.history[method]
                            if result.status == 'failed')

    @property
    def is_static(self) -> bool:
        from ..util import is_static_file
        return is_static_file(self.url)

    @property
    def is_archived(self) -> bool:
        from ..config import ARCHIVE_DIR
        from ..util import domain

        output_paths = (
            domain(self.url),
            'output.pdf',
            'screenshot.png',
            'output.html',
            'media',
            'singlefile.html'
        )

        return any(
            os.path.exists(os.path.join(ARCHIVE_DIR, self.timestamp, path))
            for path in output_paths
        )

    def latest_outputs(self, status: str=None) -> Dict[str, ArchiveOutput]:
        """get the latest output that each archive method produced for link"""
        
        ARCHIVE_METHODS = (
            'title', 'favicon', 'wget', 'warc', 'singlefile', 'pdf',
            'screenshot', 'dom', 'git', 'media', 'archive_org',
        )
        latest: Dict[str, ArchiveOutput] = {}
        for archive_method in ARCHIVE_METHODS:
            # get most recent succesful result in history for each archive method
            history = self.history.get(archive_method) or []
            history = list(filter(lambda result: result.output, reversed(history)))
            if status is not None:
                history = list(filter(lambda result: result.status == status, history))

            history = list(history)
            if history:
                latest[archive_method] = history[0].output
            else:
                latest[archive_method] = None
        return latest


    def canonical_outputs(self) -> Dict[str, Optional[str]]:
        """predict the expected output paths that should be present after archiving"""

        from ..extractors.wget import wget_output_path
        canonical = {
            'index_path': 'index.html',
            'favicon_path': 'favicon.ico',
            'google_favicon_path': 'https://www.google.com/s2/favicons?domain={}'.format(self.domain),
            'wget_path': wget_output_path(self),
            'warc_path': 'warc',
            'singlefile_path': 'singlefile.html',
            'readability_path': 'readability/content.html',
            'mercury_path': 'mercury/content.html',
            'pdf_path': 'output.pdf',
            'screenshot_path': 'screenshot.png',
            'dom_path': 'output.html',
            'archive_org_path': 'https://web.archive.org/web/{}'.format(self.base_url),
            'git_path': 'git',
            'media_path': 'media',
        }
        if self.is_static:
            # static binary files like PDF and images are handled slightly differently.
            # they're just downloaded once and aren't archived separately multiple times, 
            # so the wget, screenshot, & pdf urls should all point to the same file

            static_path = wget_output_path(self)
            canonical.update({
                'title': self.basename,
                'wget_path': static_path,
                'pdf_path': static_path,
                'screenshot_path': static_path,
                'dom_path': static_path,
                'singlefile_path': static_path,
                'readability_path': static_path,
                'mercury_path': static_path,
            })
        return canonical