"""
Pydantic models for ifccommit.yaml operation declarations and API payloads.
"""

from __future__ import annotations
from typing import Literal, Optional
from pydantic import BaseModel, model_validator


# ---------------------------------------------------------------------------
# ifccommit.yaml — operation declarations
# ---------------------------------------------------------------------------


class Operation(BaseModel):
    name: str
    command: Literal[
        "list",
        "info",
        "extract",
        "insert",
        "replace",
        "split",
        "space",
        "move",
        "copy",
        "diff",
        "history",
        "modify",
        "merge",
        "remove",
    ]

    # Shared fields
    input: Optional[str] = None
    output: Optional[str] = None

    # extract (bulk) / split
    types: Optional[list[str]] = None

    # extract (raw ifcopenshell selector query, used when types/id are insufficient)
    query: Optional[str] = None

    # extract (specific): type + id
    type: Optional[str] = None  # singular IFC type (e.g. IfcSpace)
    id: Optional[str] = None  # space name (e.g. A102)

    # insert / replace / merge
    base: Optional[str] = None
    part: Optional[str] = None

    # replace / space / merge
    space: Optional[str] = None

    # split
    outdir: Optional[str] = None

    # info
    ifc_type: Optional[str] = None

    # space
    by: Literal["name", "longname"] = "name"

    # move / copy / modify
    element: Optional[str] = None  # element name substring
    entity_id: Optional[int] = None
    entity_ids: Optional[list[int]] = None
    tags: Optional[list[str]] = None
    x: float = 0.0
    y: float = 0.0
    z: float = 0.0

    # modify / merge
    tag: Optional[str] = None

    # diff
    target: Optional[str] = None
    verbose: bool = False

    # history
    yaml_src: Optional[str] = None  # path to the yaml file (e.g. yaml/duplex.yaml)
    write_psets: bool = False        # write mode: stamp Pset_GitCommit on output elements

    @model_validator(mode="after")
    def check_required_fields(self) -> "Operation":
        cmd = self.command
        missing: list[str] = []

        if cmd in (
            "list",
            "extract",
            "split",
            "space",
            "move",
            "copy",
            "diff",
            "modify",
        ):
            if not self.input:
                missing.append("input")
        if cmd in (
            "extract",
            "insert",
            "replace",
            "space",
            "move",
            "copy",
            "modify",
            "merge",
        ):
            if not self.output:
                missing.append("output")
        if cmd == "extract":
            if not self.types and not self.query and not (self.type and self.id):
                missing.append("types (bulk), query, or type+id (specific)")
        if cmd in ("insert",):
            if not self.base:
                missing.append("base")
            if not self.part:
                missing.append("part")
        if cmd in ("replace", "merge"):
            if not self.base:
                missing.append("base")
            if not self.space:
                missing.append("space")
            if not self.part:
                missing.append("part")
        if cmd == "split":
            if not self.outdir:
                missing.append("outdir")
        if cmd == "space":
            if not self.space:
                missing.append("space")
        if cmd == "remove":
            if not self.input:
                missing.append("input")
            if not self.type:
                missing.append("type")
        if cmd == "info":
            if not self.input:
                missing.append("input")
            if not self.ifc_type:
                missing.append("ifc_type")
        if cmd == "history":
            if self.input and not self.output:
                missing.append("output (required when input is set)")
        if cmd == "copy":
            if not self.input:
                missing.append("input")
            if not self.output:
                missing.append("output")
            if not self.entity_ids and not self.tags:
                missing.append("entity_ids or tags")

        if missing:
            raise ValueError(
                f"Operation '{self.name}' (command={cmd}) is missing required fields: {missing}"
            )
        return self


class IfcCommitYaml(BaseModel):
    src: Optional[str] = None
    operations: list[Operation] = []
    dest: Optional[str] = None


# ---------------------------------------------------------------------------
# API payloads
# ---------------------------------------------------------------------------


class RepoRequest(BaseModel):
    repo: str  # e.g. "orgname/reponame"
    branch: str = "main"
    token: str
    yaml_file: str = "yaml/duplex.yaml"  # repo-relative path to the pipeline yaml
    overrides: dict[str, str] = {}  # op name → ifc_type (for info ops)
    id_overrides: dict[str, str] = {}  # op name → id (for extract ops)
    element_overrides: dict[str, str] = {}  # op name → element (for modify ops)


class EntityRequest(BaseModel):
    repo: str
    branch: str = "main"
    token: str
    file: str  # repo-relative path to the IFC file
    ifc_type: str  # IFC type to list (e.g. IfcSpace)
    location: Optional[str] = None  # if set, filter IfcElement by this space name


class HistoryRequest(BaseModel):
    repo: str
    branch: str = "main"
    token: str
    file: str = "ifc/history.json"  # repo-relative path to the history JSON