"""Render: playing, previewing, exporting and finishing the clips on the timeline.

Everything between "a clip was generated" and "a file you can keep": serving a render
so a browser can seek in it, the trimmed preview segment each timeline clip plays,
exporting a selection, and the final stitch with its seams, effects, audio and
overlays, plus the one node that upscales a finished file. This runs beside ComfyUI,
on the files it wrote.

Validated on a GPU rental; the ffmpeg parts are also tested against real ffmpeg.
"""

import asyncio
import os
import time

from ..._core import jobs, log, media, projects
from . import files, library, rtx, serving, stitch, upscale

try:
    from aiohttp import web
except Exception:                                  # noqa: BLE001 -- tests without aiohttp
    web = None

ID = "render"
TITLE = "Render"
STAGE = "post"
CATEGORY = "post"
STATUS = "experimental"
NODES = [upscale.FunUIUpscaleVideo] if upscale.io is not None else []


def routes(table, base, web):
    def project_of(req):
        found = projects.get(req.match_info["pid"])
        if found is None:
            raise web.HTTPNotFound(reason="No such project.")
        return found

    async def body_of(req):
        try:
            body = await req.json()
        except Exception:                          # noqa: BLE001
            return {}
        return body if isinstance(body, dict) else {}

    def bad(detail, status=400):
        return web.json_response({"detail": detail}, status=status)

    @table.get(base + "/result")
    async def _result(req):
        return await serving.result(req)

    @table.get(base + "/poster")
    async def _poster(req):
        return await serving.poster(req)

    @table.get(base + "/projects/{pid}/preview-segment/{scene_id}")
    async def _segment(req):
        return await serving.segment(req, project_of(req))

    @table.post(base + "/projects/{pid}/last-frame")
    async def _last_frame(req):
        proj = project_of(req)
        body = await body_of(req)
        scene_id = body.get("scene_id")
        if not isinstance(scene_id, str) or not scene_id:
            return bad("Send {scene_id}.")
        render = body.get("render") if isinstance(body.get("render"), dict) and isinstance((body["render"].get("media") or None), dict) else None
        window = serving.query_window({"dur": body.get("dur"), "src_in": body.get("src_in")})
        at = body.get("at")
        if at is not None and (isinstance(at, bool) or not isinstance(at, (int, float)) or not 0 <= at <= 1):
            return bad("`at` is how far into the clip, 0 to 1.")
        try:
            return web.json_response(await asyncio.to_thread(serving.last_frame, proj, scene_id, render, window, bool(body.get("reverse")), at))
        except KeyError as exc:
            return bad(f"No render for this scene ({exc}).", 404)
        except (files.ClipError, ValueError, OSError) as exc:
            return bad(str(exc), 502)

    @table.post(base + "/projects/{pid}/carry-log")
    async def _carry_log(req):
        """The Log's record that a carried last frame went into a reference slot (the page knows the slot; the node does not)."""
        proj = project_of(req)
        body = await body_of(req)
        scene_id, mid, ref = body.get("scene_id"), body.get("media_id"), body.get("reference")
        if not isinstance(scene_id, str) or not media.is_id(mid) or isinstance(ref, bool) or not isinstance(ref, int) or ref < 1:
            return bad("Send {scene_id, media_id, reference}.")
        entry = media.get(mid) or {}
        log.info("Continuity", f"last frame of the clip before scene {projects.safe_part(scene_id)[:40]} ({proj.id[:8]}) -> reference {ref}: {entry.get('name', mid)} [{mid}]")
        return web.json_response({"ok": True})

    @table.get(base + "/upscale_models")
    async def _upscale_models(_req):
        from ..._core import addons
        return web.json_response({"models": upscale.models(), "rtx": {"name": rtx.NAME, "qualities": list(rtx.QUALITIES)} if addons.enabled("nvidia_vsr") else None,
                                  "rtx_offered": any(a["id"] == "nvidia_vsr" for a in addons.listing())})   # offered = this machine could switch it on in Settings ▸ Modules

    @table.post(base + "/upscale")
    async def _upscale(req):
        body = await body_of(req)
        media, model = body.get("media"), body.get("model")
        if not isinstance(media, dict) or not isinstance(media.get("filename"), str) or not media["filename"] or not isinstance(model, str) or not model:
            return bad("Send {media: {filename, subfolder, type}, model, rtx_options}.")
        if model != rtx.NAME and upscale.comfy_busy():
            return bad(upscale.BUSY)
        job = jobs.new(stoppable=True)
        task = asyncio.create_task(jobs.run(job, upscale.run, media, model, body.get("rtx_options") or "{}", error=(RuntimeError, ValueError, files.ClipError), stoppable=True, exclusive=True))
        if model != rtx.NAME:
            upscale.MODEL_JOBS[0] += 1
            task.add_done_callback(lambda _t: upscale.MODEL_JOBS.__setitem__(0, max(0, upscale.MODEL_JOBS[0] - 1)))
        return web.json_response({"job_id": job})

    @table.get(base + "/upscale_busy")
    async def _upscale_busy(_req):
        """Whether an upscale-model job is queued or running: Generate waits for it (they share ComfyUI's model memory)."""
        return web.json_response({"busy": upscale.MODEL_JOBS[0] > 0})

    @table.post(base + "/jobs/{job}/stop")
    async def _stop_job(req):
        """Stop an Upscale job (the page's Stop button); only jobs that check for it can be stopped."""
        return web.json_response({"stopped": jobs.stop(req.match_info["job"])})

    @table.get(base + "/upscale/{job}")
    async def _upscale_job(req):
        job = jobs.get(req.match_info["job"])
        return web.json_response(job) if job else bad("Upscale job not found (ComfyUI restarted?).", 404)

    @table.get(base + "/library")
    async def _library(_req):
        return web.json_response(library.payload())

    @table.post(base + "/projects/{pid}/render")
    async def _render(req):
        proj = project_of(req)
        body = await body_of(req)
        clips = body.get("clips")
        clips = clips if isinstance(clips, list) else []
        if not clips and not stitch.has_graphics(proj):
            return bad("Nothing to render: add overlays, audio, or generated clips.")
        job = jobs.new()
        asyncio.create_task(jobs.run(job, stitch.render, proj, clips, body.get("real_fps") is True, error=stitch.RenderError))
        return web.json_response({"job_id": job})

    @table.get(base + "/projects/{pid}/render/{job}")
    async def _render_status(req):
        project_of(req)
        job = jobs.get(req.match_info["job"])
        return web.json_response(job) if job else bad("Render job not found.", 404)

    @table.post(base + "/projects/{pid}/export-clip")
    async def _export_clip(req):
        project_of(req)
        clip = (await body_of(req)).get("clip")
        if not isinstance(clip, dict) or not (clip.get("filename") or clip.get("bin_media_ref")):
            return bad("Missing clip filename.")
        try:
            out = await asyncio.to_thread(stitch.concat, [clip])
        except stitch.RenderError as exc:
            return bad(str(exc), 503)
        return web.json_response({"media": out["media"]})

    @table.post(base + "/projects/{pid}/export-clips")
    async def _export_clips(req):
        project_of(req)
        clips = (await body_of(req)).get("clips")
        if not isinstance(clips, list) or not clips:
            return bad("Nothing to export.")
        job = jobs.new()
        asyncio.create_task(jobs.run(job, stitch.concat, clips, error=stitch.RenderError))
        return web.json_response({"job_id": job})

    @table.get(base + "/projects/{pid}/export-clips/{job}")
    async def _export_status(req):
        project_of(req)
        job = jobs.get(req.match_info["job"])
        return web.json_response(job) if job else bad("Export job not found.", 404)

    @table.post(base + "/import-clip")
    async def _import_clip(req):
        body = await body_of(req)
        clip = body.get("clip")
        if not isinstance(clip, dict) or not (clip.get("bin_media_ref") or clip.get("filename")):
            return bad("Missing clip source.")
        name = str(body.get("name") or "").strip()
        if not name:        # no name given: a hash of which video it is, as every other saved render gets (never the project's name)
            name = serving.saved_name("|".join(str(clip.get(k) or "") for k in ("bin_media_ref", "type", "subfolder", "filename", "in", "dur")), ".mp4")
        if not name.lower().endswith((".mp4", ".webm", ".mov", ".mkv", ".avi")):
            name += ".mp4"
        try:
            data = await asyncio.to_thread(_clip_bytes, clip)
            entry = media.save_upload(name, data, limit=None)      # our own render: a long one is over the upload limit
        except (files.ClipError, stitch.RenderError) as exc:
            return bad(str(exc), 400)
        except ValueError as exc:
            return bad(str(exc), 400)
        return web.json_response({"media": entry})


def _clip_bytes(clip: dict) -> bytes:
    """The clip's bytes, trimmed when the spec asks for a window. Blocking."""
    src = files.clip_path(clip)
    inn, dur = clip.get("in"), clip.get("dur")
    try:
        needs_trim = (inn is not None and float(inn) > 0.001) or dur is not None
    except (TypeError, ValueError):
        needs_trim = True
    if not needs_trim:
        with open(src, "rb") as fh:
            return fh.read()
    out = files.temp_file(f"funui_import_{int(time.time() * 1000)}.mp4")
    try:
        files.trim(src, out, inn, dur)
        with open(out, "rb") as fh:
            return fh.read()
    finally:
        try:
            os.remove(out)
        except OSError:
            pass


PROVIDES = {"routes": routes}