import json
from uuid import uuid4

from fastapi import Depends
from fastapi.responses import Response
from pydantic import Field

from pigway_frame_flow.core.auth import require
from pigway_frame_flow.display.thumbnail_plans import (
    ThumbnailPlan,
    get_plan,
    render,
    save_plan,
)
from pigway_frame_flow.errors import ErrorCode as E
from pigway_frame_flow.errors import FlowError
from pigway_frame_flow.models import StrictModel


class ThumbnailRequest(StrictModel):
    source_id: str = Field(min_length=1, max_length=120)
    item_id: str = Field(min_length=1, max_length=2048)
    plan: ThumbnailPlan


def install_thumbnails(app, service):
    @app.get("/api/v1/thumbnail-plans", dependencies=[Depends(require("images:read"))])
    def plans():
        return [
            dict(
                id=r["key"].removeprefix("thumbnail-plan:"), **json.loads(r["payload"])
            )
            for r in service.db.all(
                "SELECT key,payload FROM app_config WHERE key LIKE 'thumbnail-plan:%' ORDER BY key"
            )
        ]

    @app.post("/api/v1/thumbnail-plans", dependencies=[Depends(require("admin"))])
    def create(plan: ThumbnailPlan):
        plan_id = uuid4().hex
        save_plan(service, plan_id, plan)
        return dict(id=plan_id, **plan.model_dump())

    @app.get(
        "/api/v1/thumbnail-plans/{plan_id}",
        dependencies=[Depends(require("images:read"))],
    )
    def detail(plan_id: str):
        return dict(id=plan_id, **get_plan(service, plan_id).model_dump())

    @app.put(
        "/api/v1/thumbnail-plans/{plan_id}", dependencies=[Depends(require("admin"))]
    )
    def update(plan_id: str, plan: ThumbnailPlan):
        with service.lock:
            get_plan(service, plan_id)
            save_plan(service, plan_id, plan)
            return dict(id=plan_id, **plan.model_dump())

    @app.delete(
        "/api/v1/thumbnail-plans/{plan_id}",
        dependencies=[Depends(require("admin"))],
        status_code=204,
    )
    def delete(plan_id: str):
        with service.lock:
            get_plan(service, plan_id)
            for row in service.db.all("SELECT payload FROM jobs"):
                job = json.loads(row["payload"])
                if job.get("thumbnail_plan_id") == plan_id:
                    raise FlowError(
                        E.CONFLICT,
                        "Thumbnail plan is used by a task",
                        409,
                        {"reason": "thumbnailPlanInUse"},
                    )
            for row in service.db.all(
                "SELECT payload FROM operations WHERE status IN ('QUEUED','RENDERING','UPLOADING','UNKNOWN')"
            ):
                if (
                    json.loads(row["payload"])
                    .get("options", {})
                    .get("thumbnail_plan_id")
                    == plan_id
                ):
                    raise FlowError(
                        E.CONFLICT,
                        "Thumbnail plan is used by a pending operation",
                        409,
                        {"reason": "thumbnailPlanInUse"},
                    )
            service.db.execute(
                "DELETE FROM app_config WHERE key=?", ("thumbnail-plan:" + plan_id,)
            )

    def image(request):
        data, _, _ = service.photo_sources.read(
            request.source_id,
            request.item_id,
            target_size=(request.plan.width, request.plan.height),
        )
        return render(data, request.plan)

    @app.post(
        "/api/v1/thumbnails/preview", dependencies=[Depends(require("images:read"))]
    )
    def preview(request: ThumbnailRequest):
        return Response(
            image(request),
            media_type="image/jpeg",
            headers={"Cache-Control": "no-store"},
        )

    @app.post("/api/v1/thumbnails/generate", dependencies=[Depends(require("admin"))])
    def generate(request: ThumbnailRequest):
        return service.assets.put(
            image(request), request.plan.name + ".jpg", "generated"
        )