from enum import Enum, unique
from typing import Annotated, Any
from dataclasses import dataclass

from pydantic import BaseModel, PlainSerializer, Field, ConfigDict, BeforeValidator
from pdfplumber.page import Page
from pdfplumber.table import Table


class XLevel(BaseModel):
    x1: float
    x2: float


class YLevel(BaseModel):
    y1: float
    y2: float


class HorizontalLine(BaseModel):
    x1: float
    x2: float
    y: float


class Area(BaseModel):
    x1: float
    y1: float
    x2: float
    y2: float


@unique
class Weekday(Enum):
    MONTAG = ("Montag", 0)
    DIENSTAG = ("Dienstag", 1)
    MITTWOCH = ("Mittwoch", 2)
    DONNERSTAG = ("Donnerstag", 3)
    FREITAG = ("Freitag", 4)
    SAMSTAG = ("Samstag", 5)
    SONNTAG = ("Sonntag", 6)

    def __init__(self, display_name, index):
        self.display_name = display_name
        self.index = index


@unique
class SemesterType(Enum):
    HS = "Herbstsemester"
    FS = "Frühlingssemester"


class Semester(BaseModel):
    model_config = ConfigDict(frozen=True)
    yyyy: int
    semester_type: SemesterType


class Date(BaseModel):
    yyyy: int
    mm: int
    dd: int


class Time(BaseModel):
    hh: int
    mm: int


class ExportTimestamp(BaseModel):
    date: Date
    time: Time


@unique
class DegreeProgram(Enum):
    DATASCIENCE = "Data Science"
    ELEK_U_INFO = "Elektro- und Informationstechnik"
    ENER_U_UMWELT = "Energie- und Umwelttechnik"
    ICOMPETENCE = "iCompetence"
    INFORMATIK = "Informatik"
    KONTEXT_BWL = "Kontext BWL"
    KONTEXT_ENGLISCH = "Kontext Englisch"
    KONTEXT_GSW = "Kontext GSW"
    KONTEXT_KOMM = "Kontext Kommunikation"
    MIXED_BWL_GSW_KOMM = "Mixed BWL, GSW, Kommunikation"
    MASCHINENBAU = "Maschinenbau"
    SYSTEMTECHNIK = "Systemtechnik"
    WIRTSCHAFT_ING = "Wirtschaftsingenieurwesen"
    AGNOSTIC = "SG-???"


class PageMetadata(BaseModel):
    semester: Semester
    export_timestamp: ExportTimestamp
    class_name: str
    degree_program: DegreeProgram


class UnmergedTimeEntries(BaseModel):
    cells: list[Area]
    horizontal_lines: list[HorizontalLine]


class TimeSlot(BaseModel):
    model_config = ConfigDict(frozen=True)
    start_time: str
    end_time: str

    def start_seconds(self) -> int:
        hours, minutes = map(int, self.start_time.split(":"))
        return hours * 3600 + minutes * 60

    def end_seconds(self) -> int:
        hours, minutes = map(int, self.end_time.split(":"))
        return hours * 3600 + minutes * 60


def to_tuple_if_list(v: Any) -> Any:
    if isinstance(v, list):
        return tuple(v)
    return v


# needed for pydantic to correctly parse the custom Weekday Enum
TolerantWeekday = Annotated[Weekday, BeforeValidator(to_tuple_if_list)]


class RawExtractedModule(BaseModel):
    weekday: TolerantWeekday
    start_seconds: int
    end_seconds: int
    text: str
    source_page_number: int


@unique
class TeachingType(Enum):
    ON_SITE = "on_site"
    ONLINE = "online"
    HYBRID = "hybrid"
    BLOCK = "blockmodule"


class RawLecturer(BaseModel):
    """
    Basic representation of an extracted lecturer from a pdf that needs to be parsed.
    """

    shorthand: str
    firstname: str
    surname: str


class Lecturer(BaseModel):
    """
    JSON-serializable representation of a parsed lecturer ready to be exported.
    """

    short: str
    surname: str
    firstname: str


# tells pydantic to to use the index field for the special Weekday Enum
CustomWeekday = Annotated[Weekday, PlainSerializer(lambda v: v.index, return_type=int)]


class ParsedModuleCellTextData(BaseModel):
    module_shorthand: str
    degree_program: DegreeProgram
    class_name: str
    rooms: list[str]
    part_of_other_classes: list[str]
    teaching_type: TeachingType
    lecturer_shorthands: list[str]


class ClassJsonModule(BaseModel):
    model_config = ConfigDict(populate_by_name=True)
    weekday: CustomWeekday
    module_shorthand: str = Field(..., alias="name")
    start_seconds: int = Field(..., alias="from")
    end_seconds: int = Field(..., alias="to")
    degree_program: DegreeProgram = Field(..., alias="degree_prg")
    class_name: str = Field(..., alias="class")
    rooms: list[str]
    pages: list[int]
    part_of_other_classes: list[str]
    id: str
    teaching_type: TeachingType
    lecturer_shorthands: list[str] = Field(..., alias="teachers")


class ClassPdfExtractionPageData(BaseModel):
    raw_extracted_modules: list[RawExtractedModule]
    page_metadata: PageMetadata


class RawClassPdfExtractionPageData(BaseModel):
    raw_extracted_modules: list[RawExtractedModule]
    above_table_text: str


class StartsWithMatch(BaseModel):
    shorthand_found: str
    num_of_matches: int


@dataclass
class TimeSlotYLevelsCollectionData:
    row_index: int
    page: Page
    table: Table
    expected_timeslot_index: int
    last_timeslot: TimeSlot
    weekday_areas: dict[Weekday, Area]