import re
import shutil
from pathlib import Path

from flask import Blueprint, current_app, jsonify, render_template, request

from app.immich import ImmichClient
from app.state import load_state, save_state

bp = Blueprint("export", __name__)


def slugify(text: str) -> str:
    text = text.lower().strip()
    text = re.sub(r"[^\w\s-]", "", text)
    return re.sub(r"[\s_-]+", "-", text).strip("-")


def _client():
    return ImmichClient(
        current_app.config["IMMICH_URL"],
        current_app.config["IMMICH_API_KEY"],
    )


@bp.get("/export")
def export_view():
    album_id = request.args["album_id"]
    state = load_state(album_id, current_app)
    to_export = [g for g in state.groups if g.status == "written"]
    skipped = [g for g in state.groups if g.status == "skipped"]
    return render_template(
        "phase6.html",
        state=state,
        to_export=to_export,
        skipped=skipped,
        current_phase="export",
        album_id=album_id,
        phase_stale=state.phase_stale,
        notes_content=state.notes,
    )


@bp.post("/export/run")
def run_export():
    body = request.get_json()
    album_id = body["album_id"]
    overwrite_ids = set(body.get("overwrite_ids", []))
    state = load_state(album_id, current_app)
    pages_dir = Path(current_app.config["PAGES_DIR"])
    client = _client()
    photo_map = {p.id: p for p in state.photos}
    results = []

    for group in state.groups:
        if group.status != "written":
            continue

        title_slug = slugify(group.title or group.date or "entry")
        if group.entry_type == "journal":
            folder_name = f"{group.date}-{title_slug}.entry"
            dest = pages_dir / "01.trips" / state.grav_trip_slug / "01.dailies" / folder_name
            md_file = "entry.md"
            template = "entry"
        else:
            folder_name = f"{title_slug}.story"
            dest = pages_dir / "01.trips" / state.grav_trip_slug / "04.stories" / folder_name
            md_file = "entry.md"
            template = "story"

        if dest.exists() and group.id not in overwrite_ids:
            results.append({
                "group_id": group.id,
                "needs_overwrite": True,
                "title": group.title,
                "dest": str(dest),
            })
            # Mark as exported since destination already exists
            group.status = "exported"
            continue

        if dest.exists():
            shutil.rmtree(dest)

        dest.mkdir(parents=True, exist_ok=True)

        # Download photos
        failed = []
        hero_filename = None
        photo_num = 1
        for pid in group.photo_ids:
            photo = photo_map.get(pid)
            if not photo:
                continue
            filename = f"photo-{photo_num}.jpg"
            try:
                data = client.get_original(pid)
                (dest / filename).write_bytes(data)
                if pid == group.hero_photo_id or photo_num == 1:
                    hero_filename = filename
                photo_num += 1
            except Exception as e:
                current_app.logger.warning("Failed to download asset %s: %s", pid, e)
                failed.append({"asset_id": pid, "error": str(e)})

        # Build frontmatter
        date_str = (group.date + " 12:00") if group.date else ""
        if group.entry_type == "journal":
            frontmatter = (
                f"---\n"
                f"title: '{group.title}'\n"
                f"date: '{date_str}'\n"
                f"template: {template}\n"
                f"published: true\n"
                f"location_city: '{group.location_city}'\n"
                f"location_country: '{group.location_country}'\n"
                f"hero_image: {hero_filename or ''}\n"
                f"---\n"
            )
        else:
            frontmatter = (
                f"---\n"
                f"title: '{group.title}'\n"
                f"date: '{date_str}'\n"
                f"template: {template}\n"
                f"published: true\n"
                f"hero_image: {hero_filename or ''}\n"
                f"---\n"
            )

        body_text = group.body or ""
        if group.shortcode_hints:
            body_text += f"\n<!-- shortcode hints:\n{group.shortcode_hints}\n-->"

        (dest / md_file).write_text(frontmatter + "\n" + body_text)
        group.status = "exported"
        results.append({
            "group_id": group.id,
            "title": group.title,
            "dest": str(dest),
            "failed_photos": failed,
        })

    save_state(state, current_app)
    return jsonify({"ok": True, "results": results})


@bp.post("/export/overwrite")
def overwrite_export():
    body = request.get_json()
    album_id = body["album_id"]
    group_id = body["group_id"]
    state = load_state(album_id, current_app)
    pages_dir = Path(current_app.config["PAGES_DIR"])
    client = _client()
    photo_map = {p.id: p for p in state.photos}

    group = next((g for g in state.groups if g.id == group_id), None)
    if group is None:
        return jsonify({"ok": False, "error": "group not found"}), 404

    title_slug = slugify(group.title or group.date or "entry")
    if group.entry_type == "journal":
        folder_name = f"{group.date}-{title_slug}.entry"
        dest = pages_dir / "01.trips" / state.grav_trip_slug / "01.dailies" / folder_name
        md_file = "entry.md"
        template = "entry"
    else:
        folder_name = f"{title_slug}.story"
        dest = pages_dir / "01.trips" / state.grav_trip_slug / "04.stories" / folder_name
        md_file = "entry.md"
        template = "story"

    if dest.exists():
        shutil.rmtree(dest)
    dest.mkdir(parents=True, exist_ok=True)

    failed = []
    hero_filename = None
    photo_num = 1
    for pid in group.photo_ids:
        photo = photo_map.get(pid)
        if not photo:
            continue
        filename = f"photo-{photo_num}.jpg"
        try:
            data = client.get_original(pid)
            (dest / filename).write_bytes(data)
            if pid == group.hero_photo_id or photo_num == 1:
                hero_filename = filename
            photo_num += 1
        except Exception as e:
            current_app.logger.warning("Failed to download asset %s: %s", pid, e)
            failed.append({"asset_id": pid, "error": str(e)})

    date_str = (group.date + " 12:00") if group.date else ""
    if group.entry_type == "journal":
        frontmatter = (
            f"---\n"
            f"title: '{group.title}'\n"
            f"date: '{date_str}'\n"
            f"template: {template}\n"
            f"published: true\n"
            f"location_city: '{group.location_city}'\n"
            f"location_country: '{group.location_country}'\n"
            f"hero_image: {hero_filename or ''}\n"
            f"---\n"
        )
    else:
        frontmatter = (
            f"---\n"
            f"title: '{group.title}'\n"
            f"date: '{date_str}'\n"
            f"template: {template}\n"
            f"published: true\n"
            f"hero_image: {hero_filename or ''}\n"
            f"---\n"
        )

    body_text = group.body or ""
    if group.shortcode_hints:
        body_text += f"\n<!-- shortcode hints:\n{group.shortcode_hints}\n-->"

    (dest / md_file).write_text(frontmatter + "\n" + body_text)
    group.status = "exported"
    save_state(state, current_app)

    return jsonify({
        "ok": True,
        "exported": 1,
        "title": group.title,
        "dest": str(dest),
        "failed_photos": failed,
    })