"""Review-plan and apply-review command implementations."""

from __future__ import annotations

import json
import sys
from pathlib import Path
from typing import Optional

import click

from vlm.cli_helpers import command_error, default_artifact_path, resolve_legacy_default_input_path, review_plan_tui_streams_ok
from vlm.context import CLIContext
from vlm.io import load_analysis_json, load_identities_json
from vlm.plan_render import (
    duplicate_groups_from_plan,
    preferred_plan_summary,
    render_review_footer,
    render_review_preview,
    render_review_verdict,
)
from vlm.plan_review import GROUP_BY_CHOICES, prepare_review_rows, save_review_csv
from vlm.plan_structure_preview import write_structure_preview
from vlm.planner import apply_review_to_plan, load_plan, save_plan


def review_plan_cmd(
    ctx: CLIContext,
    input: Path,
    output: Path,
    season_threshold: int,
    episode_threshold: int,
    preview_limit: int,
    show_all: bool,
    tui: bool,
    identities: Optional[Path],
    analysis: Optional[Path],
    group_by: str,
    sample_safe: int,
    structure_preview: Optional[Path],
) -> None:
    """Review a plan and export high-risk operations for manual confirmation."""
    logger = ctx.logger

    try:
        input = resolve_legacy_default_input_path(input, "input", "plan.json", "--input")
        if season_threshold < 1 or episode_threshold < 1:
            click.echo("Error: thresholds must be >= 1", err=True)
            sys.exit(1)
        if preview_limit < 1:
            click.echo("Error: --preview-limit must be >= 1", err=True)
            sys.exit(1)
        if sample_safe < 0:
            click.echo("Error: --sample-safe must be >= 0", err=True)
            sys.exit(1)
        group_by = group_by.lower()
        if group_by not in GROUP_BY_CHOICES:
            click.echo(f"Error: invalid --group-by {group_by}", err=True)
            sys.exit(1)

        if tui:
            if not review_plan_tui_streams_ok():
                click.echo("Error: --tui requires an interactive terminal (TTY)", err=True)
                sys.exit(1)

        click.echo(f"Loading plan: {input}")
        execution_plan = load_plan(input)

        identities_data = None
        identities_path = identities
        if identities_path is None:
            default_id = default_artifact_path("identities.json")
            if default_id.is_file():
                identities_path = default_id
        if identities_path is not None and identities_path.is_file():
            identities_data = load_identities_json(identities_path)
            click.echo(f"Loaded identities: {identities_path}")

        analysis_data = None
        if analysis is not None and analysis.is_file():
            analysis_data = load_analysis_json(analysis)
            click.echo(f"Loaded analysis: {analysis}")

        rows, counters = prepare_review_rows(
            execution_plan,
            season_threshold=season_threshold,
            episode_threshold=episode_threshold,
            library_root=ctx.config.library_root,
            identities_data=identities_data,
            analysis_data=analysis_data,
            sample_safe=sample_safe,
            group_by=group_by,
        )

        if structure_preview is not None:
            write_structure_preview(
                execution_plan,
                ctx.config.library_root,
                structure_preview,
            )
            click.echo(f"Wrote structure preview: {structure_preview}")

        if tui:
            from vlm.plan_review import build_duplicate_path_maps
            from vlm.review_tui import ReviewTUIContext, run_plan_review_tui

            _, path_to_quality = build_duplicate_path_maps(analysis_data)
            tui_ctx = ReviewTUIContext(
                rows=rows,
                counters=counters,
                library_root=ctx.config.library_root,
                output_csv=output,
                plan_input=input,
                summary_text=preferred_plan_summary(execution_plan),
                path_to_quality=path_to_quality,
            )
            rc = run_plan_review_tui(tui_ctx)
            if rc != 0:
                click.echo("Plan review aborted (no CSV written).", err=True)
                sys.exit(rc)
            click.echo(f"Saved manual review CSV to: {output}")
            logger.info(
                "Plan review TUI completed: total=%s high_risk=%s output=%s",
                counters["total_operations"],
                counters["high_risk_operations"],
                output,
            )
            return

        save_review_csv(rows, output)

        click.echo()
        click.echo("Plan overview:")
        click.echo(preferred_plan_summary(execution_plan))

        click.echo()
        click.echo("Plan review summary:")
        click.echo(f"  Total operations: {counters['total_operations']}")
        click.echo(f"  High-risk operations: {counters['high_risk_operations']}")
        click.echo(f"  manual_review: {counters['manual_review']}")
        click.echo(f"  sample_source: {counters['sample_source']}")
        click.echo(f"  high_season: {counters['high_season']}")
        click.echo(f"  high_episode: {counters['high_episode']}")
        click.echo(f"  conflicts: {counters['conflicts']}")

        click.echo()
        click.echo(render_review_verdict(counters))

        click.echo()
        click.echo("High-risk operations preview:")
        if rows:
            preview_lines, hidden_count = render_review_preview(
                rows,
                preview_limit=preview_limit,
                show_all=show_all,
                library_root=ctx.config.library_root,
            )
            for line in preview_lines:
                click.echo(line)
            if hidden_count > 0:
                click.echo(
                    f"  ... and {hidden_count} more high-risk operations "
                    "(use --show-all to display all)"
                )
        else:
            click.echo("  (none)")

        click.echo()
        click.echo(f"Saved manual review CSV to: {output}")

        dup_groups = duplicate_groups_from_plan(execution_plan)
        click.echo()
        for line in render_review_footer(
            counters=counters,
            output_csv=output,
            plan_input=input,
            duplicate_groups=dup_groups,
        ):
            click.echo(line)

        logger.info(
            "Plan review completed: total=%s high_risk=%s output=%s",
            counters["total_operations"],
            counters["high_risk_operations"],
            output,
        )
    except FileNotFoundError:
        command_error(ctx, f"Error: Plan file not found: {input}", f"Plan file not found: {input}")
    except json.JSONDecodeError as e:
        command_error(
            ctx,
            f"Error: Failed to parse plan JSON: {e}",
            f"Plan review JSON parsing failed: {e}",
            exc_info=True,
        )
    except Exception as e:
        command_error(
            ctx,
            f"Error during plan review: {e}",
            f"Plan review failed: {e}",
            exc_info=True,
        )


def apply_review_cmd(
    ctx: CLIContext,
    plan: Path,
    csv: Path,
    output: Optional[Path],
) -> None:
    """Apply modifications from a manual review CSV back to the plan JSON."""
    logger = ctx.logger
    output_path = output or plan

    try:
        click.echo(f"Loading plan: {plan}")
        execution_plan = load_plan(plan)

        click.echo(f"Applying review from: {csv}")
        updated_plan = apply_review_to_plan(execution_plan, csv)

        save_plan(updated_plan, output_path)
        click.echo(f"Successfully updated plan saved to: {output_path}")

        modified = 0
        for i, op in enumerate(updated_plan.operations):
            if op.operation_type != execution_plan.operations[i].operation_type:
                modified += 1

        click.echo(f"Total operations modified: {modified}")
        logger.info("Applied review from %s to %s, modified %s ops", csv, output_path, modified)

    except Exception as e:
        command_error(
            ctx,
            f"Error applying review: {e}",
            f"Apply review failed: {e}",
            exc_info=True,
        )