"""ResearchLink AI CLI."""

from __future__ import annotations

from pathlib import Path

import typer
import yaml
from rich.console import Console
from rich.panel import Panel

from researchlink import __product__, __version__

app = typer.Typer(
    name="researchlink",
    help=f"{__product__} — Multi-agent research digest platform",
    add_completion=False,
)
console = Console()


def version_callback(value: bool):
    if value:
        console.print(f"[bold]{__product__}[/bold] v{__version__}")
        raise typer.Exit()


@app.callback()
def main(
    version: bool | None = typer.Option(
        None, "--version", "-v", callback=version_callback, is_eager=True,
        help="Show version and exit."
    )
):
    pass


@app.command()
def ingest(
    pdf: Path | None = typer.Option(None, "--pdf", help="Path to paper PDF"),
    pdf_url: str | None = typer.Option(None, "--pdf-url", help="URL to download paper PDF"),
    paper_url: str | None = typer.Option(None, "--paper-url", help="Paper landing page URL"),
    github_url: str | None = typer.Option(None, "--github-url", help="GitHub repository URL"),
    arxiv: str | None = typer.Option(None, "--arxiv", help="arXiv ID or abs/pdf URL (e.g. 1706.03762)"),
    doi: str | None = typer.Option(None, "--doi", help="DOI (e.g. 10.1109/CVPR.2016.90)"),
    metadata: Path | None = typer.Option(
        None, "--metadata", help="Manual metadata YAML/JSON file (highest-trust source)"),
    bibtex: str | None = typer.Option(None, "--bibtex", help="BibTeX string"),
    author_notes: str | None = typer.Option(None, "--author-notes", help="Author notes"),
    output: Path = typer.Option(Path("papers"), "--output", "-o", help="Output directory"),
    config: Path | None = typer.Option(None, "--config", "-c", help="YAML config file"),
    force: bool = typer.Option(False, "--force", help="Overwrite existing files"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show resolved inputs; run nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose agent output"),
):
    """
    Ingest a research paper and generate a GitHub-ready paper digest module.

    Examples:

      researchlink ingest --pdf paper.pdf --paper-url https://... --github-url https://...

      researchlink ingest --arxiv 1706.03762

      researchlink ingest --doi 10.1109/CVPR.2016.90

      researchlink ingest --metadata paper_meta.yml

      researchlink ingest --config examples/marl_iotp_input.yml
    """
    from researchlink.pipeline import run_pipeline

    console.print(
        Panel(
            f"[bold cyan]{__product__}[/bold cyan] v{__version__}\n"
            "Transforming research papers into structured digest modules.",
            title="ResearchLink AI",
        )
    )

    raw_inputs: dict = {}

    # Load config file first (CLI flags override)
    if config:
        if not config.exists():
            console.print(f"[red]Config file not found: {config}[/red]")
            raise typer.Exit(1)
        with open(config) as f:
            raw_inputs = yaml.safe_load(f) or {}
        console.print(f"[dim]Loaded config: {config}[/dim]")

    # CLI flags override config values
    if pdf:
        raw_inputs["paper_pdf_path"] = str(pdf)
    if pdf_url:
        raw_inputs["paper_pdf_url"] = pdf_url
    if paper_url:
        raw_inputs["paper_url"] = paper_url
    if github_url:
        raw_inputs["github_url"] = github_url
    if arxiv:
        raw_inputs["arxiv_id"] = arxiv
    if doi:
        raw_inputs["doi"] = doi
    if metadata:
        if not metadata.exists():
            console.print(f"[red]Metadata file not found: {metadata}[/red]")
            raise typer.Exit(1)
        import json as _json
        text = metadata.read_text()
        try:
            raw_inputs["manual_metadata"] = (
                _json.loads(text) if metadata.suffix == ".json" else yaml.safe_load(text)
            ) or {}
        except Exception as e:
            console.print(f"[red]Failed to parse metadata file: {e}[/red]")
            raise typer.Exit(1)
        console.print(f"[dim]Loaded manual metadata: {metadata}[/dim]")
    if bibtex:
        raw_inputs["bibtex"] = bibtex
    if author_notes:
        raw_inputs["author_notes"] = author_notes
    if output != Path("papers") or "target_output_dir" not in raw_inputs:
        raw_inputs["target_output_dir"] = str(output)
    if force:
        raw_inputs["force_overwrite"] = True

    if dry_run:
        redacted = {k: v for k, v in raw_inputs.items() if k != "manual_metadata"}
        if "manual_metadata" in raw_inputs:
            redacted["manual_metadata"] = f"<{len(raw_inputs['manual_metadata'])} keys>"
        console.print("[yellow]--dry-run:[/yellow] resolved inputs:")
        for k, v in redacted.items():
            console.print(f"  {k} = {v}")
        console.print("[dim]No pipeline run.[/dim]")
        return

    try:
        report = run_pipeline(raw_inputs, verbose=verbose)
        if not report.success:
            raise typer.Exit(1)
    except KeyboardInterrupt:
        console.print("\n[yellow]Interrupted by user.[/yellow]")
        raise typer.Exit(130)
    except Exception as e:
        console.print(f"[red]Pipeline error: {e}[/red]")
        if verbose:
            import traceback
            traceback.print_exc()
        raise typer.Exit(1)


@app.command()
def validate(
    output_dir: Path = typer.Argument(..., help="Path to a generated paper module directory"),
):
    """Validate a generated paper module directory for completeness."""
    from researchlink.validators.output_validator import validate_paper_module
    results = validate_paper_module(output_dir)
    for item in results:
        icon = "[green]✓[/green]" if item["ok"] else "[red]✗[/red]"
        console.print(f"  {icon} {item['message']}")
    missing = [r for r in results if not r["ok"]]
    if missing:
        console.print(f"\n[yellow]{len(missing)} validation issue(s) found.[/yellow]")
        raise typer.Exit(1)
    else:
        console.print("\n[green]All validation checks passed.[/green]")


def _module_dir(path: Path) -> Path:
    """Resolve and validate a paper-module directory (or exit)."""
    if not path.exists() or not path.is_dir():
        console.print(f"[red]Module directory not found: {path}[/red]")
        raise typer.Exit(1)
    return path


@app.command()
def enrich(
    module_dir: Path = typer.Argument(..., help="Path to a papers/<slug>/ module"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show what would happen; write nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose output"),
):
    """Re-resolve provenance metadata for a module and rewrite metadata.json / sources.json."""
    import json as _json

    from researchlink.services.metadata_sources import resolve_metadata
    from researchlink.services.module_io import load_metadata
    from researchlink.services.paper_module import build_metadata_json

    mod = _module_dir(module_dir)
    meta = load_metadata(mod)
    console.print(f"[dim]Enriching:[/dim] {meta.title} ({meta.slug})")
    if dry_run:
        console.print("[yellow]--dry-run:[/yellow] would resolve sources and rewrite "
                      "metadata.json + sources.json")
        return

    prov = resolve_metadata(
        arxiv_id=meta.arxiv_id, doi=meta.doi, title=meta.title, paper_url=meta.paper_url,
        user_fields={"title": meta.title, "year": meta.year, "venue": meta.venue,
                     "authors": meta.authors_provisional or None, "doi": meta.doi,
                     "arxiv_id": meta.arxiv_id, "url": meta.paper_url, "code_url": meta.code_url},
    )
    payload, sources = build_metadata_json(prov, meta)
    (mod / "metadata.json").write_text(_json.dumps(payload, indent=2, ensure_ascii=False) + "\n")
    (mod / "sources.json").write_text(_json.dumps(sources, indent=2, ensure_ascii=False) + "\n")
    conflicts = prov.conflicts()
    console.print(f"[green]Enriched.[/green] Sources: {[s.name for s in prov.sources]}"
                  + (f" [yellow]conflicts: {conflicts}[/yellow]" if conflicts else ""))


@app.command()
def discover(
    module_dir: Path = typer.Argument(..., help="Path to a papers/<slug>/ module"),
    max_papers: int = typer.Option(30, "--max-papers", help="Max related papers"),
    online: bool = typer.Option(False, "--online", help="Query the web (default: offline references)"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show what would happen; write nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose output"),
):
    """Discover related work and (re)write related_work.md + literature_map.json."""
    import json as _json

    from researchlink.services.discovery import discover as _discover
    from researchlink.services.discovery import related_work_markdown
    from researchlink.services.module_io import load_extraction, load_metadata, write_module_file

    mod = _module_dir(module_dir)
    meta = load_metadata(mod)
    extraction = load_extraction(mod)
    mode = "online" if online else "offline (references)"
    console.print(f"[dim]Discovering ({mode}):[/dim] {meta.title}")
    if dry_run:
        console.print(f"[yellow]--dry-run:[/yellow] would discover up to {max_papers} papers "
                      "and write related_work.md + literature_map.json")
        return

    related, lit_map = _discover(meta, extraction, max_papers=max_papers, offline=not online)
    write_module_file(mod, "related_work.md", related_work_markdown(meta, related, lit_map))
    (mod / "literature_map.json").write_text(
        _json.dumps(lit_map.model_dump(mode="json"), indent=2, ensure_ascii=False) + "\n")
    console.print(f"[green]Discovered[/green] {len(related)} related papers; "
                  f"map: {len(lit_map.nodes)} nodes.")


@app.command()
def study(
    module_dir: Path = typer.Argument(..., help="Path to a papers/<slug>/ module"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show what would happen; write nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose output"),
):
    """Regenerate study_notes.md from the module's extracted content."""
    from researchlink.agents.teaching_path_agent import TeachingPathAgent
    from researchlink.services.module_io import load_extraction, load_metadata, write_module_file

    mod = _module_dir(module_dir)
    meta = load_metadata(mod)
    if dry_run:
        console.print("[yellow]--dry-run:[/yellow] would regenerate study_notes.md")
        return
    files = TeachingPathAgent(verbose=verbose).run(meta, load_extraction(mod))
    for name, content in files.items():
        dest = write_module_file(mod, name, content)
        console.print(f"[green]Wrote[/green] {dest.name}")


@app.command()
def review(
    module_dir: Path = typer.Argument(..., help="Path to a papers/<slug>/ module"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show what would happen; write nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose output"),
):
    """Regenerate review.md and claims.md (grounded) from the module."""
    from researchlink.agents.reviewer_agent import ReviewerAgent
    from researchlink.schemas.citations import CitationReport
    from researchlink.services.module_io import load_extraction, load_metadata, write_module_file

    mod = _module_dir(module_dir)
    meta = load_metadata(mod)
    if dry_run:
        console.print("[yellow]--dry-run:[/yellow] would regenerate review.md + claims.md")
        return
    extraction = load_extraction(mod)
    existing = {"digest.md": (mod / "summary.md").read_text(encoding="utf-8", errors="replace")
                if (mod / "summary.md").exists() else ""}
    result = ReviewerAgent(verbose=verbose).run(meta, CitationReport(), existing, extraction)
    result.pop("quality_flags", None)
    for name, content in result.items():
        dest = write_module_file(mod, name, content)
        console.print(f"[green]Wrote[/green] {dest.name}")


@app.command()
def export(
    module_dir: Path = typer.Argument(..., help="Path to a papers/<slug>/ module"),
    fmt: str = typer.Option("markdown", "--format", "-f", help="markdown | json | bibtex"),
    out: Path | None = typer.Option(None, "--out", help="Write to file instead of stdout"),
    dry_run: bool = typer.Option(False, "--dry-run", help="Show what would happen; write nothing"),
    verbose: bool = typer.Option(False, "--verbose", help="Verbose output"),
):
    """Export a module as consolidated markdown, JSON, or BibTeX."""
    import json as _json

    mod = _module_dir(module_dir)
    if fmt not in ("markdown", "json", "bibtex"):
        console.print(f"[red]Unknown format: {fmt} (use markdown|json|bibtex)[/red]")
        raise typer.Exit(1)

    if fmt == "bibtex":
        bib = mod / "bibtex.bib"
        content = bib.read_text(encoding="utf-8") if bib.exists() else "% no bibtex.bib found\n"
    elif fmt == "json":
        meta_path = mod / "metadata.json"
        payload = {
            "metadata": _json.loads(meta_path.read_text()) if meta_path.exists() else {},
            "files": sorted(p.relative_to(mod).as_posix() for p in mod.rglob("*") if p.is_file()),
        }
        content = _json.dumps(payload, indent=2, ensure_ascii=False)
    else:  # markdown — concatenate spec docs in reading order
        order = ["README.md", "summary.md", "paper.md", "claims.md", "related_work.md",
                 "implementation.md", "reproduction.md", "study_notes.md", "review.md"]
        parts = []
        for name in order:
            p = mod / name
            if p.exists():
                parts.append(f"\n\n---\n\n<!-- {name} -->\n\n" + p.read_text(encoding="utf-8"))
        content = "".join(parts).lstrip()

    if dry_run:
        console.print(f"[yellow]--dry-run:[/yellow] would export {fmt} "
                      f"({len(content)} chars){f' to {out}' if out else ' to stdout'}")
        return
    if out:
        out.write_text(content, encoding="utf-8")
        console.print(f"[green]Exported[/green] {fmt} → {out}")
    else:
        console.print(content)


@app.command()
def index(
    papers_dir: Path = typer.Argument(Path("papers"), help="Papers workspace root"),
):
    """(Re)build the GitHub-ready workspace index at <papers_dir>/README.md."""
    from researchlink.services.workspace_index import write_workspace_index
    if not papers_dir.exists():
        console.print(f"[red]Papers directory not found: {papers_dir}[/red]")
        raise typer.Exit(1)
    dest = write_workspace_index(papers_dir)
    console.print(f"[green]Wrote workspace index:[/green] {dest}")


@app.command()
def serve(
    host: str = typer.Option("127.0.0.1", "--host", help="Bind host"),
    port: int = typer.Option(7860, "--port", "-p", help="Bind port"),
    reload: bool = typer.Option(False, "--reload", help="Auto-reload on code changes (dev mode)"),
):
    """
    Start the ResearchLink AI web server.

    Opens a browser-based UI for paper ingestion, provider management, and results viewing.

    Example:  researchlink serve --port 7860
    """
    try:
        import uvicorn
    except ImportError:
        console.print("[red]uvicorn not installed. Run: pip install uvicorn[standard][/red]")
        raise typer.Exit(1)

    console.print(
        Panel(
            f"[bold cyan]{__product__}[/bold cyan] v{__version__}\n"
            f"Web UI → [link=http://{host}:{port}]http://{host}:{port}[/link]\n"
            f"Settings → [link=http://{host}:{port}/settings]http://{host}:{port}/settings[/link]",
            title="ResearchLink AI — Web Server",
        )
    )
    uvicorn.run(
        "researchlink.api.app:app",
        host=host,
        port=port,
        reload=reload,
        log_level="info",
    )


if __name__ == "__main__":
    app()