"""Parse command implementation."""

from __future__ import annotations

from pathlib import Path
from typing import Optional

import click

from vlm.cli_helpers import default_artifact_path, resolve_legacy_default_input_path, run_command
from vlm.context import CLIContext, pass_context
from vlm.io import load_inventory_csv, save_identities_json
from vlm.models import (
    IdentityRecord,
    MovieIdentityRecord,
    ParsedIdentitiesJSON,
    SeriesIdentityRecord,
    VideoFile,
)
from vlm.parser import parse_anime, parse_movie, parse_series
from vlm.utils import utc_now


def parse_cmd(ctx: CLIContext, input: Path, output: Path, inventory: Optional[Path]) -> None:
    """Parse identities from scanned inventory."""
    config = ctx.config
    logger = ctx.logger

    click.echo(f"Parsing identities from: {input}")

    path_to_metadata: dict[str, VideoFile] = {}
    if inventory:
        click.echo(f"Loading video metadata from: {inventory}")
        inventory_files = load_inventory_csv(inventory)
        path_to_metadata = {str(vf.path): vf for vf in inventory_files}
        click.echo(f"Loaded metadata for {len(path_to_metadata)} files")

    click.echo()

    inventory_files = load_inventory_csv(input)
    video_files: list[dict[str, str]] = [
        {
            "path": str(vf.path),
            "filename": vf.filename,
            "category": vf.category,
        }
        for vf in inventory_files
    ]

    click.echo(f"Loaded {len(video_files)} files from inventory")
    click.echo()

    movie_identities: list[MovieIdentityRecord] = []
    series_identities: list[SeriesIdentityRecord] = []
    anime_identities: list[SeriesIdentityRecord] = []
    other_files: list[IdentityRecord] = []

    def get_video_metadata(file_path: str) -> dict:
        """Extract video metadata from inventory if available."""
        if not path_to_metadata:
            return {}
        vf = path_to_metadata.get(file_path)
        if not vf:
            return {}
        return {
            "size_bytes": vf.size_bytes,
            "modified_timestamp": vf.modified_timestamp.isoformat(),
            "resolution": vf.resolution,
            "codec": vf.codec,
            "duration_seconds": vf.duration_seconds,
            "bitrate_kbps": vf.bitrate_kbps,
        }

    for vf in video_files:
        filename = vf["filename"]
        category = vf["category"]
        file_path = vf["path"]
        video_metadata = get_video_metadata(file_path)

        if category == "movie":
            identity = parse_movie(filename, extensions=config.video_extensions)
            record = {
                "path": file_path,
                "filename": filename,
                "category": category,
                "title": identity.title,
                "year": identity.year,
                "confidence": identity.confidence,
                "needs_review": identity.needs_review,
            }
            if video_metadata:
                record["video_metadata"] = video_metadata
            movie_identities.append(record)
        elif category == "series":
            identity = parse_series(filename, extensions=config.video_extensions)
            record = {
                "path": file_path,
                "filename": filename,
                "category": category,
                "title": identity.title,
                "season": identity.season,
                "episodes": identity.episodes,
                "confidence": identity.confidence,
                "needs_review": identity.needs_review,
            }
            if video_metadata:
                record["video_metadata"] = video_metadata
            series_identities.append(record)
        elif category == "anime":
            identity = parse_anime(filename, extensions=config.video_extensions)
            record = {
                "path": file_path,
                "filename": filename,
                "category": category,
                "title": identity.title,
                "season": identity.season,
                "episodes": identity.episodes,
                "confidence": identity.confidence,
                "needs_review": identity.needs_review,
            }
            if video_metadata:
                record["video_metadata"] = video_metadata
            anime_identities.append(record)
        else:
            other_files.append(
                {
                    "path": vf["path"],
                    "filename": filename,
                    "category": category,
                    "note": "Not categorized for parsing",
                }
            )

    click.echo("Parsing complete!")
    click.echo()
    click.echo("Results by category:")
    click.echo(f"  Movies: {len(movie_identities)}")

    movies_need_review = sum(1 for m in movie_identities if m["needs_review"])
    if movies_need_review > 0:
        click.echo(f"    - Need review: {movies_need_review}")

    click.echo(f"  Series: {len(series_identities)}")

    series_need_review = sum(1 for s in series_identities if s["needs_review"])
    if series_need_review > 0:
        click.echo(f"    - Need review: {series_need_review}")

    click.echo(f"  Anime: {len(anime_identities)}")

    anime_need_review = sum(1 for a in anime_identities if a["needs_review"])
    if anime_need_review > 0:
        click.echo(f"    - Need review: {anime_need_review}")

    click.echo(f"  Other: {len(other_files)} (not parsed)")

    click.echo()
    click.echo(f"Saving parsed identities to: {output}")

    generation_timestamp = utc_now().strftime("%Y-%m-%dT%H:%M:%S")
    schema_version = "2.0" if path_to_metadata else "1.0"

    identities_data: ParsedIdentitiesJSON = {
        "vlm_schema_version": schema_version,
        "metadata": {
            "generated": generation_timestamp,
            "source_inventory": str(input),
            "total_files": len(video_files),
        },
        "movies": movie_identities,
        "series": series_identities,
        "anime": anime_identities,
        "other": other_files,
    }

    save_identities_json(identities_data, output)

    click.echo("Parsed identities saved successfully!")
    logger.info(
        "Parse completed: %s movies, %s series, %s anime, saved to %s",
        len(movie_identities),
        len(series_identities),
        len(anime_identities),
        output,
    )


@click.command()
@click.option("--input", type=click.Path(path_type=Path), default=lambda: default_artifact_path("inventory.csv"))
@click.option("--output", type=click.Path(path_type=Path), default=lambda: default_artifact_path("identities.json"))
@click.option("--inventory", type=click.Path(exists=True, path_type=Path), default=None)
@pass_context
def parse(ctx: CLIContext, input: Path, output: Path, inventory: Optional[Path]):
    """Parse identities from filenames."""
    def _run():
        input_resolved = resolve_legacy_default_input_path(input, "input", "inventory.csv", "--input")
        parse_cmd(ctx, input_resolved, output, inventory)
    run_command(ctx, _run, stage="parse", json_errors=True)