from __future__ import annotations

from copy import deepcopy
from pathlib import Path
from typing import Any

from renderer.core.config import Settings
from renderer.core.utils import new_id, now, read_json, safe_filename, write_json
from renderer.studio.capabilities import TIMELINE_TRACK_TYPES, is_timeline_operation, is_track_type


DEFAULT_EXPORT_SETTINGS: dict[str, Any] = {
    "format": "mp4",
    "preset": "tiktok",
    "platform": "tiktok",
    "resolution": "1080p",
    "fps": 30,
    "codec": "h264",
    "audio_codec": "aac",
}


def default_project(name: str, metadata: dict[str, Any] | None = None, project_id: str | None = None) -> dict[str, Any]:
    created = now()
    project_id = project_id or new_id("project")
    return {
        "id": project_id,
        "name": name,
        "slug": safe_filename(name),
        "version": 1,
        "schema": "ava2lon.project.v1",
        "created_at": created,
        "updated_at": created,
        "metadata": metadata or {},
        "timeline": {
            "duration": 0.0,
            "fps": 30,
            "tracks": {track_type: [] for track_type in TIMELINE_TRACK_TYPES},
            "groups": [],
            "markers": [],
        },
        "assets": [],
        "audio_tracks": [],
        "video_tracks": [],
        "text_layers": [],
        "sticker_layers": [],
        "effects": [],
        "filters": [],
        "keyframes": [],
        "captions": [],
        "templates": [],
        "export_settings": deepcopy(DEFAULT_EXPORT_SETTINGS),
        "plugins": [],
        "automation": {"webhooks": [], "batch": {}, "n8n": {"compatible": True}},
    }


class ProjectStore:
    def __init__(self, settings: Settings | None = None) -> None:
        self.settings = settings or Settings()
        self.settings.ensure_dirs()
        self.root = self.settings.storage_dir / "projects"
        self.root.mkdir(parents=True, exist_ok=True)

    def list(self) -> list[dict[str, Any]]:
        projects: list[dict[str, Any]] = []
        for manifest in sorted(self.root.glob("*/project.json")):
            try:
                data = normalize_project(read_json(manifest, {}))
                projects.append(_summary(data, manifest.parent))
            except Exception:
                continue
        return projects

    def create(self, name: str, metadata: dict[str, Any] | None = None, template: dict[str, Any] | None = None) -> dict[str, Any]:
        project = normalize_project(template or default_project(name, metadata))
        project["name"] = name
        project["metadata"] = metadata or project.get("metadata", {})
        if not project.get("id"):
            project["id"] = new_id("project")
        project["slug"] = safe_filename(str(project.get("slug") or name or project["id"]))
        project["created_at"] = project.get("created_at") or now()
        project["updated_at"] = now()
        self.save(project["id"], project)
        return project

    def get(self, project_id: str) -> dict[str, Any]:
        path = self._path(project_id)
        data = read_json(path, None)
        if data is None:
            raise KeyError(project_id)
        return normalize_project(data)

    def save(self, project_id: str, project: dict[str, Any]) -> dict[str, Any]:
        normalized = normalize_project(project)
        normalized["id"] = project_id or normalized.get("id") or new_id("project")
        normalized["slug"] = safe_filename(str(normalized.get("slug") or normalized.get("name") or normalized["id"]))
        normalized["updated_at"] = now()
        write_json(self._path(normalized["id"]), normalized)
        return normalized

    def delete(self, project_id: str) -> None:
        path = self._path(project_id)
        if not path.exists():
            raise KeyError(project_id)
        directory = path.parent
        for child in directory.glob("*"):
            if child.is_file():
                child.unlink()
        try:
            directory.rmdir()
        except OSError:
            pass

    def add_asset(self, project_id: str, asset: dict[str, Any]) -> dict[str, Any]:
        project = self.get(project_id)
        asset = deepcopy(asset)
        asset.setdefault("id", new_id("asset"))
        asset.setdefault("created_at", now())
        project["assets"].append(asset)
        return self.save(project_id, project)

    def add_to_timeline(self, project_id: str, item: dict[str, Any], track_type: str = "video", track_id: str | None = None) -> dict[str, Any]:
        project = self.get(project_id)
        add_timeline_item(project, item, track_type=track_type, track_id=track_id)
        return self.save(project_id, project)

    def timeline_operation(self, project_id: str, operation: str, item_id: str | None = None, params: dict[str, Any] | None = None) -> dict[str, Any]:
        project = self.get(project_id)
        apply_timeline_operation(project, operation, item_id=item_id, params=params or {})
        return self.save(project_id, project)

    def _path(self, project_id: str) -> Path:
        project_id = safe_filename(project_id)
        return self.root / project_id / "project.json"


def normalize_project(project: dict[str, Any]) -> dict[str, Any]:
    normalized = deepcopy(project or {})
    normalized.setdefault("id", new_id("project"))
    normalized.setdefault("name", "Untitled Project")
    normalized.setdefault("slug", safe_filename(str(normalized["name"])))
    normalized.setdefault("version", 1)
    normalized.setdefault("schema", "ava2lon.project.v1")
    normalized.setdefault("created_at", now())
    normalized.setdefault("updated_at", now())
    normalized.setdefault("metadata", {})
    normalized.setdefault("timeline", {})
    timeline = normalized["timeline"]
    timeline.setdefault("duration", 0.0)
    timeline.setdefault("fps", 30)
    timeline.setdefault("tracks", {})
    for track_type in TIMELINE_TRACK_TYPES:
        timeline["tracks"].setdefault(track_type, [])
    timeline.setdefault("groups", [])
    timeline.setdefault("markers", [])
    for key in (
        "assets",
        "audio_tracks",
        "video_tracks",
        "text_layers",
        "sticker_layers",
        "effects",
        "filters",
        "keyframes",
        "captions",
        "templates",
        "plugins",
    ):
        normalized.setdefault(key, [])
    normalized.setdefault("export_settings", deepcopy(DEFAULT_EXPORT_SETTINGS))
    normalized.setdefault("automation", {"webhooks": [], "batch": {}, "n8n": {"compatible": True}})
    _recalculate_duration(normalized)
    return normalized


def add_timeline_item(project: dict[str, Any], item: dict[str, Any], *, track_type: str = "video", track_id: str | None = None) -> dict[str, Any]:
    if not is_track_type(track_type):
        raise ValueError(f"Unsupported track type: {track_type}")
    normalized = normalize_project(project)
    item = deepcopy(item)
    item.setdefault("id", new_id("clip"))
    item.setdefault("type", track_type)
    item.setdefault("start", 0.0)
    item.setdefault("duration", max(float(item.get("end", 0.0)) - float(item.get("start", 0.0)), 0.0) or 1.0)
    item.setdefault("source_start", 0.0)
    item.setdefault("locked", False)
    item.setdefault("hidden", False)
    item.setdefault("keyframes", [])
    item.setdefault("effects", [])
    item.setdefault("filters", [])
    item.setdefault("metadata", {})
    track = _ensure_track(normalized, track_type, track_id)
    track["items"].append(item)
    track["items"].sort(key=lambda entry: float(entry.get("start", 0.0)))
    project.clear()
    project.update(normalized)
    _mirror_layers(project, track_type, item)
    _recalculate_duration(project)
    return item


def apply_timeline_operation(project: dict[str, Any], operation: str, *, item_id: str | None = None, params: dict[str, Any] | None = None) -> dict[str, Any]:
    if not is_timeline_operation(operation):
        raise ValueError(f"Unsupported timeline operation: {operation}")
    params = params or {}
    normalized = normalize_project(project)

    if operation == "insert":
        add_timeline_item(
            normalized,
            params.get("item", {}),
            track_type=str(params.get("track_type", "video")),
            track_id=params.get("track_id"),
        )
    elif operation == "group":
        group_id = str(params.get("group_id") or new_id("group"))
        item_ids = [str(value) for value in params.get("item_ids", [])]
        normalized["timeline"]["groups"].append({"id": group_id, "item_ids": item_ids, "metadata": params.get("metadata", {})})
        for grouped_id in item_ids:
            try:
                grouped_item, _ = _find_item(normalized, grouped_id)
                grouped_item["group_id"] = group_id
            except KeyError:
                continue
    else:
        if not item_id:
            raise ValueError(f"{operation} requires item_id")
        item, track = _find_item(normalized, item_id)
        if operation == "drag":
            item["start"] = max(0.0, float(params.get("start", item.get("start", 0.0))))
        elif operation == "trim":
            if "start" in params:
                item["start"] = max(0.0, float(params["start"]))
            if "duration" in params:
                item["duration"] = max(0.001, float(params["duration"]))
            if "source_start" in params:
                item["source_start"] = max(0.0, float(params["source_start"]))
        elif operation == "split":
            offset = float(params.get("offset", 0.0))
            duration = float(item.get("duration", 0.0))
            if offset <= 0 or offset >= duration:
                raise ValueError("split offset must be inside the item duration")
            new_item = deepcopy(item)
            new_item["id"] = str(params.get("new_item_id") or new_id("clip"))
            new_item["start"] = float(item.get("start", 0.0)) + offset
            new_item["duration"] = duration - offset
            new_item["source_start"] = float(item.get("source_start", 0.0)) + offset
            item["duration"] = offset
            track["items"].append(new_item)
            track["items"].sort(key=lambda entry: float(entry.get("start", 0.0)))
        elif operation == "ripple_delete":
            start = float(item.get("start", 0.0))
            duration = float(item.get("duration", 0.0))
            track["items"] = [entry for entry in track["items"] if entry.get("id") != item_id]
            for entry in track["items"]:
                if float(entry.get("start", 0.0)) > start:
                    entry["start"] = max(start, float(entry.get("start", 0.0)) - duration)
        elif operation == "replace":
            replacement = deepcopy(params.get("item", {}))
            replacement.setdefault("id", item_id)
            replacement.setdefault("start", item.get("start", 0.0))
            replacement.setdefault("duration", item.get("duration", 1.0))
            replacement.setdefault("type", item.get("type", track.get("type")))
            index = track["items"].index(item)
            track["items"][index] = replacement
        elif operation == "lock":
            item["locked"] = bool(params.get("locked", True))
        elif operation == "hide":
            item["hidden"] = bool(params.get("hidden", True))
        elif operation == "duplicate":
            duplicate = deepcopy(item)
            duplicate["id"] = str(params.get("new_item_id") or new_id("clip"))
            duplicate["start"] = float(params.get("start", float(item.get("start", 0.0)) + float(item.get("duration", 1.0))))
            track["items"].append(duplicate)
            track["items"].sort(key=lambda entry: float(entry.get("start", 0.0)))

    project.clear()
    project.update(normalized)
    _recalculate_duration(project)
    return project


def add_effect(project: dict[str, Any], target_id: str, effect: str, params: dict[str, Any] | None = None) -> dict[str, Any]:
    effect_record = {"id": new_id("effect"), "target_id": target_id, "effect": effect, "params": params or {}, "created_at": now()}
    project.setdefault("effects", []).append(effect_record)
    try:
        item, _ = _find_item(project, target_id)
        item.setdefault("effects", []).append(effect_record)
    except KeyError:
        pass
    return effect_record


def add_filter(project: dict[str, Any], target_id: str, filter_name: str, params: dict[str, Any] | None = None) -> dict[str, Any]:
    filter_record = {"id": new_id("filter"), "target_id": target_id, "filter": filter_name, "params": params or {}, "created_at": now()}
    project.setdefault("filters", []).append(filter_record)
    try:
        item, _ = _find_item(project, target_id)
        item.setdefault("filters", []).append(filter_record)
    except KeyError:
        pass
    return filter_record


def add_transition(project: dict[str, Any], from_item_id: str, to_item_id: str, transition: str, duration: float = 0.45) -> dict[str, Any]:
    record = {
        "id": new_id("transition"),
        "from_item_id": from_item_id,
        "to_item_id": to_item_id,
        "transition": transition,
        "duration": duration,
        "created_at": now(),
    }
    project.setdefault("timeline", {}).setdefault("transitions", []).append(record)
    return record


def add_keyframe(
    project: dict[str, Any],
    target_id: str,
    property_name: str,
    time: float,
    value: Any,
    easing: str = "linear",
) -> dict[str, Any]:
    record = {
        "id": new_id("keyframe"),
        "target_id": target_id,
        "property": property_name,
        "time": max(0.0, float(time)),
        "value": value,
        "easing": easing,
    }
    project.setdefault("keyframes", []).append(record)
    try:
        item, _ = _find_item(project, target_id)
        item.setdefault("keyframes", []).append(record)
    except KeyError:
        pass
    return record


def _ensure_track(project: dict[str, Any], track_type: str, track_id: str | None = None) -> dict[str, Any]:
    tracks = project["timeline"]["tracks"].setdefault(track_type, [])
    if track_id:
        for track in tracks:
            if track.get("id") == track_id:
                return track
    if not tracks:
        track_id = track_id or f"{track_type}_1"
    else:
        track_id = track_id or f"{track_type}_{len(tracks) + 1}"
    track = {"id": track_id, "type": track_type, "name": f"{track_type.title()} {len(tracks) + 1}", "locked": False, "hidden": False, "items": []}
    tracks.append(track)
    return track


def _find_item(project: dict[str, Any], item_id: str) -> tuple[dict[str, Any], dict[str, Any]]:
    for tracks in project.get("timeline", {}).get("tracks", {}).values():
        for track in tracks:
            for item in track.get("items", []):
                if item.get("id") == item_id:
                    return item, track
    raise KeyError(item_id)


def _mirror_layers(project: dict[str, Any], track_type: str, item: dict[str, Any]) -> None:
    mirror_key = {
        "video": "video_tracks",
        "audio": "audio_tracks",
        "text": "text_layers",
        "sticker": "sticker_layers",
        "subtitle": "captions",
    }.get(track_type)
    if mirror_key:
        project.setdefault(mirror_key, []).append({"item_id": item["id"], **deepcopy(item)})


def _recalculate_duration(project: dict[str, Any]) -> None:
    duration = 0.0
    for tracks in project.get("timeline", {}).get("tracks", {}).values():
        for track in tracks:
            for item in track.get("items", []):
                duration = max(duration, float(item.get("start", 0.0)) + float(item.get("duration", 0.0)))
    project.setdefault("timeline", {})["duration"] = round(duration, 3)


def _summary(project: dict[str, Any], directory: Path) -> dict[str, Any]:
    return {
        "id": project.get("id"),
        "name": project.get("name"),
        "slug": project.get("slug"),
        "path": str(directory),
        "updated_at": project.get("updated_at"),
        "duration": project.get("timeline", {}).get("duration", 0.0),
        "asset_count": len(project.get("assets", [])),
        "metadata": project.get("metadata", {}),
    }