#!/usr/bin/env python3
"""
CLI entry point for media-agent.

Usage:
    python cli.py preview article.md --theme professional-clean
    python cli.py publish article.md --appid wx123 --secret abc123
    python cli.py themes
"""

import argparse
import sys
import webbrowser
from pathlib import Path

import yaml

from converter import WeChatConverter, preview_html
from theme import load_theme, list_themes
from wechat_api import get_access_token, upload_image, upload_thumb
from publisher import create_draft

# Config file search order
CONFIG_PATHS = [
    Path.cwd() / "config.yaml",
    Path(__file__).parent.parent / "config.yaml",  # skill root
    Path(__file__).parent / "config.yaml",          # toolkit dir
    Path.home() / ".config" / "media-agent" / "config.yaml",
]


def load_config() -> dict:
    """Load config from first found config.yaml."""
    for p in CONFIG_PATHS:
        if p.exists():
            with open(p, "r", encoding="utf-8") as f:
                return yaml.safe_load(f) or {}
    return {}


def cmd_preview(args):
    """Generate HTML preview and open in browser."""
    theme = load_theme(args.theme)
    converter = WeChatConverter(theme=theme)
    result = converter.convert_file(args.input)

    # Wrap in full HTML for browser preview
    full_html = preview_html(result.html, theme)

    # Write to temp file
    input_path = Path(args.input)
    output = args.output or str(input_path.with_suffix(".html"))
    Path(output).write_text(full_html, encoding="utf-8")

    print(f"Title: {result.title}")
    print(f"Digest: {result.digest}")
    print(f"Images: {len(result.images)}")
    print(f"Output: {output}")

    if not args.no_open:
        webbrowser.open(f"file://{Path(output).absolute()}")
        print("Opened in browser.")


def cmd_publish(args):
    """Convert, upload images, and create WeChat draft."""
    cfg = load_config()
    wechat_cfg = cfg.get("wechat", {})

    # Resolve from CLI args → config.yaml fallback
    appid = args.appid or wechat_cfg.get("appid")
    secret = args.secret or wechat_cfg.get("secret")
    theme_name = args.theme or cfg.get("theme", "professional-clean")
    author = args.author or wechat_cfg.get("author")

    if not appid or not secret:
        print("Error: --appid and --secret required (or set in config.yaml)", file=sys.stderr)
        sys.exit(1)

    theme = load_theme(theme_name)
    converter = WeChatConverter(theme=theme)
    result = converter.convert_file(args.input)

    print(f"Title: {result.title}")
    print(f"Digest: {result.digest}")
    print(f"Images found: {len(result.images)}")

    # Get access token
    token = get_access_token(appid, secret)
    print("Access token obtained.")

    # Upload images referenced in article and replace src
    # Resolve relative paths against the markdown file's directory
    md_dir = Path(args.input).resolve().parent
    html = result.html
    for img_src in result.images:
        if img_src.startswith(("http://", "https://")):
            print(f"Skipping remote image: {img_src}")
            continue

        # Try: absolute → relative to CWD → relative to markdown file
        img_path = Path(img_src)
        if not img_path.is_absolute():
            if not img_path.exists():
                img_path = md_dir / img_src

        if img_path.exists():
            print(f"Uploading image: {img_src}")
            wechat_url = upload_image(token, str(img_path))
            html = html.replace(img_src, wechat_url)
            print(f"  -> {wechat_url}")
        else:
            print(f"Warning: image not found: {img_src} (searched {md_dir})")

    # Upload cover image if provided
    thumb_media_id = None
    if args.cover:
        print(f"Uploading cover: {args.cover}")
        thumb_media_id = upload_thumb(token, args.cover)
        print(f"  -> media_id: {thumb_media_id}")

    # Create draft
    title = args.title or result.title or Path(args.input).stem
    digest = result.digest
    draft = create_draft(
        access_token=token,
        title=title,
        html=html,
        digest=digest,
        thumb_media_id=thumb_media_id,
        author=author,
    )

    print(f"\nDraft created! media_id: {draft.media_id}")


def cmd_themes(args):
    """List available themes."""
    names = list_themes()
    for name in names:
        theme = load_theme(name)
        print(f"  {name:24s} {theme.description}")


def main():
    parser = argparse.ArgumentParser(
        prog="media-agent",
        description="Markdown to WeChat HTML converter and publisher",
    )
    sub = parser.add_subparsers(dest="command", required=True)

    # preview
    p_preview = sub.add_parser("preview", help="Generate HTML and open in browser")
    p_preview.add_argument("input", help="Markdown file path")
    p_preview.add_argument("-t", "--theme", default="professional-clean", help="Theme name")
    p_preview.add_argument("-o", "--output", help="Output HTML file path")
    p_preview.add_argument("--no-open", action="store_true", help="Don't open browser")

    # publish
    p_publish = sub.add_parser("publish", help="Convert and publish as WeChat draft")
    p_publish.add_argument("input", help="Markdown file path")
    p_publish.add_argument("-t", "--theme", default=None, help="Theme name")
    p_publish.add_argument("--appid", default=None, help="WeChat AppID (or set in config.yaml)")
    p_publish.add_argument("--secret", default=None, help="WeChat AppSecret (or set in config.yaml)")
    p_publish.add_argument("--cover", help="Cover image file path")
    p_publish.add_argument("--title", help="Override article title")
    p_publish.add_argument("--author", default=None, help="Article author")

    # themes
    sub.add_parser("themes", help="List available themes")

    args = parser.parse_args()

    try:
        if args.command == "preview":
            cmd_preview(args)
        elif args.command == "publish":
            cmd_publish(args)
        elif args.command == "themes":
            cmd_themes(args)
    except Exception as e:
        print(f"Error: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()