"""Gradio UI for Hugging Face Spaces — same behavior as index.html."""

import html
from pathlib import Path

import gradio as gr
from fastapi import HTTPException

from main import (
    _extensions_in_tree,
    fetch_repo_data_github,
    fetch_repo_data_lcoaldisk,
    llm_structure_from_tree,
    llm_summary_from_code,
    llm_technologies_from_requirements,
    parse_github_url,
)


def _error_message(detail: str | list | dict) -> str:
    if isinstance(detail, str):
        return detail
    if isinstance(detail, list):
        parts = []
        for item in detail:
            if isinstance(item, dict) and "msg" in item:
                loc = item.get("loc", [])
                parts.append(f"{'.'.join(str(x) for x in loc)}: {item['msg']}")
            else:
                parts.append(str(item))
        return "; ".join(parts) if parts else str(detail)
    return str(detail)


def _technologies_html(technologies: list[str]) -> str:
    if not technologies:
        return ""
    tags = "".join(
        f'<span style="display:inline-block;padding:0.25rem 0.5rem;margin:0.15rem;'
        f'font-size:0.85rem;background:#e8edf2;border-radius:4px;">'
        f"{html.escape(str(t))}</span>"
        for t in technologies
    )
    return f'<div style="display:flex;flex-wrap:wrap;gap:0.35rem;">{tags}</div>'


def _error_html(message: str) -> str:
    return f'<p style="color:#cf2222;margin:0;">{html.escape(message)}</p>'


async def summarize(repo_source: str) -> tuple[str, str, str, str]:
    """Run /summarize logic. Returns (summary, technologies_html, structure, error_html)."""
    repo_source = (repo_source or "").strip()
    if not repo_source:
        return "", "", "", _error_html("repo_source is required")

    try:
        if "github.com" in repo_source:
            owner, repo = parse_github_url(repo_source)
            code_context, requirements_content, directory_tree, files_included = (
                await fetch_repo_data_github(owner, repo)
            )
        else:
            path = Path(repo_source).expanduser().resolve()
            if not path.exists() or not path.is_dir():
                return (
                    "",
                    "",
                    "",
                    _error_html(
                        "repo_source must be either a valid GitHub URL "
                        "or an existing local directory path"
                    ),
                )
            code_context, requirements_content, directory_tree, files_included = (
                await fetch_repo_data_lcoaldisk(str(path))
            )

        if files_included == 0:
            return (
                "",
                "",
                "",
                _error_html("No readable text files found in the repository."),
            )

        extensions_in_project = _extensions_in_tree(directory_tree)
        summary_text = await llm_summary_from_code(code_context)
        technologies_list = await llm_technologies_from_requirements(
            requirements_content, extensions_in_project
        )
        structure_text = await llm_structure_from_tree(directory_tree)

        return summary_text, _technologies_html(technologies_list), structure_text, ""
    except HTTPException as exc:
        return "", "", "", _error_html(_error_message(exc.detail))
    except ValueError as exc:
        return "", "", "", _error_html(str(exc))
    except Exception as exc:
        return "", "", "", _error_html(str(exc) or "Internal server error")


with gr.Blocks(title="Repo Summarizer") as demo:
    gr.Markdown("# Repo Summarizer")
    repo_input = gr.Textbox(
        label="GitHub URL/Local Path Repository",
        placeholder="https://github.com/owner/repo or /path/to/repo",
    )
    submit_btn = gr.Button("Summarize", variant="primary")

    with gr.Column():
        error_out = gr.HTML("")
        gr.Markdown("### Summary")
        summary_out = gr.Markdown("")
        gr.Markdown("### Technologies")
        technologies_out = gr.HTML("")
        gr.Markdown("### Structure")
        structure_out = gr.Markdown("")

    async def run_and_show(repo_source: str):
        summary, tech_html, structure, err_html = await summarize(repo_source)
        return err_html, summary, tech_html, structure

    outputs = [error_out, summary_out, technologies_out, structure_out]
    submit_btn.click(
        fn=run_and_show,
        inputs=[repo_input],
        outputs=outputs,
        show_progress=True,
    )
    repo_input.submit(
        fn=run_and_show,
        inputs=[repo_input],
        outputs=outputs,
        show_progress=True,
    )

demo.queue()

if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",
        ssr_mode=False,
        share=False,
    )