"""Reviewed candidate materialization for batch-source action commands."""

from __future__ import annotations

from dataclasses import dataclass

from . import candidate_inputs as _candidate_inputs
from . import candidate_planning as _candidate_planning
from . import candidate_previews as _candidate_previews
from ...batch.operation_candidate_types import (
    OperationCandidatePreview,
    TargetCandidatePreview,
)
from ...batch.state.metadata_types import BatchFileMetadataDict
from ...core.buffer import LineBuffer
from ...core.replacement import ReplacementPayload
from ...utils.repository_buffers import (
    read_git_object_buffer_or_none,
    load_working_tree_file_as_buffer,
)
from ...exceptions import MergeError, exit_with_error
from ...i18n import _


@dataclass(frozen=True)
class ApplyCandidateMaterialization:
    """Materialized apply candidate plus metadata needed by command execution."""

    preview: OperationCandidatePreview
    previews: tuple[OperationCandidatePreview, ...]
    file_path: str
    file_mode: str | None

    @property
    def target(self) -> TargetCandidatePreview:
        return self.preview.require_target("worktree")

    def close(self) -> None:
        _candidate_previews.close_candidate_previews(self.previews)


@dataclass(frozen=True)
class IncludeCandidateMaterialization:
    """Materialized include candidate plus metadata needed by command execution."""

    preview: OperationCandidatePreview
    previews: tuple[OperationCandidatePreview, ...]
    file_path: str
    index_file_mode: str | None
    worktree_file_mode: str | None

    @property
    def index_target(self) -> TargetCandidatePreview:
        return self.preview.require_target("index")

    @property
    def worktree_target(self) -> TargetCandidatePreview:
        return self.preview.require_target("worktree")

    def close(self) -> None:
        _candidate_previews.close_candidate_previews(self.previews)


def materialize_apply_candidate(
    *,
    batch_name: str,
    raw_selector: str,
    ordinal: int,
    files: dict[str, BatchFileMetadataDict],
    selected_ids: set[int] | None,
    selection_ids_to_apply: set[int] | None,
) -> ApplyCandidateMaterialization:
    """Return the reviewed apply candidate selected by the user."""
    if len(files) != 1:
        exit_with_error(_("Candidate execution requires exactly one file."))
    file_path, file_meta = next(iter(files.items()))
    if not _candidate_inputs.is_text_candidate_entry(file_meta):
        exit_with_error(
            _("Candidate execution is only available for text batch entries.")
        )

    batch_source_ref = _candidate_inputs.require_candidate_batch_source_ref(
        file_path,
        file_meta,
    )
    batch_source_buffer = read_git_object_buffer_or_none(batch_source_ref.object_spec)
    if batch_source_buffer is None:
        exit_with_error(
            _("Batch source content is missing for {file}.").format(file=file_path)
        )

    worktree_target = _candidate_inputs.candidate_worktree_text_target(
        file_path=file_path,
        file_meta=file_meta,
        selected_ids=selected_ids,
    )

    with (
        batch_source_buffer as batch_source_lines,
        load_working_tree_file_as_buffer(file_path) as working_lines,
    ):
        try:
            previews = _candidate_planning.plan_apply_candidate_previews(
                batch_name=batch_name,
                file_path=file_path,
                file_meta=file_meta,
                batch_source_lines=batch_source_lines,
                batch_source_commit=batch_source_ref.commit,
                worktree_lines=working_lines,
                worktree_target=worktree_target,
                selected_ids=selected_ids,
                selection_ids=selection_ids_to_apply,
            )
        except MergeError as e:
            exit_with_error(str(e))

        try:
            preview = _candidate_previews.require_candidate_preview_for_ordinal(
                previews,
                ordinal,
                batch_name=batch_name,
                operation="apply",
                file_path=file_path,
            )
            _candidate_previews.require_candidate_preview_state(
                preview,
                ordinal,
                selector=raw_selector,
                file_path=file_path,
            )
        except Exception:
            _candidate_previews.close_candidate_previews(previews)
            raise

    return ApplyCandidateMaterialization(
        preview=preview,
        previews=previews,
        file_path=file_path,
        file_mode=worktree_target.file_mode,
    )


def materialize_include_candidate(
    *,
    batch_name: str,
    raw_selector: str,
    ordinal: int,
    files: dict[str, BatchFileMetadataDict],
    selected_ids: set[int] | None,
    selection_ids_to_include: set[int] | None,
    replacement_payload: ReplacementPayload | None,
) -> IncludeCandidateMaterialization:
    """Return the reviewed include candidate selected by the user."""
    if len(files) != 1:
        exit_with_error(_("Candidate execution requires exactly one file."))
    file_path, file_meta = next(iter(files.items()))
    if not _candidate_inputs.is_text_candidate_entry(file_meta):
        exit_with_error(
            _("Candidate execution is only available for text batch entries.")
        )

    batch_source_ref = _candidate_inputs.require_candidate_batch_source_ref(
        file_path,
        file_meta,
    )
    batch_source_buffer = read_git_object_buffer_or_none(batch_source_ref.object_spec)
    if batch_source_buffer is None:
        exit_with_error(
            _("Batch source content is missing for {file}.").format(file=file_path)
        )

    index_buffer = read_git_object_buffer_or_none(f":{file_path}")
    index_exists = index_buffer is not None
    if index_buffer is None:
        index_buffer = LineBuffer.from_bytes(b"")
    index_target = _candidate_inputs.candidate_index_text_target(
        file_meta=file_meta,
        selected_ids=selected_ids,
        index_exists=index_exists,
    )
    worktree_target = _candidate_inputs.candidate_worktree_text_target(
        file_path=file_path,
        file_meta=file_meta,
        selected_ids=selected_ids,
    )

    with (
        batch_source_buffer as batch_source_lines,
        index_buffer as index_lines,
        load_working_tree_file_as_buffer(file_path) as working_lines,
    ):
        try:
            previews = _candidate_planning.plan_include_candidate_previews(
                batch_name=batch_name,
                file_path=file_path,
                file_meta=file_meta,
                batch_source_lines=batch_source_lines,
                batch_source_commit=batch_source_ref.commit,
                index_lines=index_lines,
                index_target=index_target,
                worktree_lines=working_lines,
                worktree_target=worktree_target,
                selected_ids=selected_ids,
                selection_ids=selection_ids_to_include,
                replacement_payload=replacement_payload,
            )
        except (MergeError, ValueError) as e:
            exit_with_error(str(e))

        try:
            preview = _candidate_previews.require_candidate_preview_for_ordinal(
                previews,
                ordinal,
                batch_name=batch_name,
                operation="include",
                file_path=file_path,
            )
            _candidate_previews.require_candidate_preview_state(
                preview,
                ordinal,
                selector=raw_selector,
                file_path=file_path,
            )
        except Exception:
            _candidate_previews.close_candidate_previews(previews)
            raise

    return IncludeCandidateMaterialization(
        preview=preview,
        previews=previews,
        file_path=file_path,
        index_file_mode=index_target.file_mode,
        worktree_file_mode=worktree_target.file_mode,
    )
