"""
Playwright actions + forensic recorder.

The recorder captures everything a downstream AI agent would need to diagnose
a broken application flow:

* a structured `step_log` (one entry per `recorder.step(...)`)
* browser console logs
* browser errors
* every network request + selective response bodies
* page HTML at finalize time
* screenshots at key moments

Payloads are capped so SQLite stays healthy. Screenshots are base64 JPEGs.
"""
import asyncio
import base64
import logging
import time
from contextlib import asynccontextmanager
from typing import Optional

from playwright.async_api import ViewportSize, async_playwright
from reportlab.pdfgen import canvas

from settings import BROWSER_HEIGHT, BROWSER_LOCALE, BROWSER_WIDTH, HEADLESS, POST_SUBMISSION_SLEEP_MS

logger = logging.getLogger("flat-apply")

MAX_CONSOLE_ENTRIES = 200
MAX_NETWORK_ENTRIES = 150
MAX_BODY_SNIPPET = 2000
MAX_HTML_DUMP = 200_000       # 200 KB
SCREENSHOT_JPEG_QUALITY = 60


class Recorder:
    """Captures browser + step telemetry for one apply run."""

    def __init__(self, url: str):
        self.started_at = time.time()
        self.url = url
        self.steps: list[dict] = []
        self.console: list[dict] = []
        self.errors: list[dict] = []
        self.network: list[dict] = []
        self.screenshots: list[dict] = []
        self.final_html: Optional[str] = None
        self.final_url: Optional[str] = None

    # --- step log -----------------------------------------------------------
    def step(self, step_name: str, status: str = "ok", detail: str = "") -> None:
        entry = {
            "ts": round(time.time() - self.started_at, 3),
            "step": step_name,
            "status": status,
            "detail": str(detail)[:500],
        }
        self.steps.append(entry)
        log = logger.info if status == "ok" else logger.warning
        log("step %-20s %-4s %s", step_name, status, detail)

    # --- browser hooks ------------------------------------------------------
    def _attach(self, page) -> None:
        def on_console(msg):
            try:
                text = msg.text
            except Exception:
                text = "<unavailable>"
            if len(self.console) < MAX_CONSOLE_ENTRIES:
                self.console.append({
                    "ts": round(time.time() - self.started_at, 3),
                    "type": getattr(msg, "type", "?"),
                    "text": text[:500],
                })

        def on_pageerror(err):
            if len(self.errors) < MAX_CONSOLE_ENTRIES:
                self.errors.append({
                    "ts": round(time.time() - self.started_at, 3),
                    "message": str(err)[:1000],
                })

        def on_request(req):
            if len(self.network) < MAX_NETWORK_ENTRIES:
                self.network.append({
                    "ts": round(time.time() - self.started_at, 3),
                    "kind": "request",
                    "method": req.method,
                    "url": req.url,
                    "resource_type": req.resource_type,
                })

        async def on_response(resp):
            if len(self.network) >= MAX_NETWORK_ENTRIES:
                return
            try:
                snippet = ""
                if resp.status >= 400:
                    try:
                        body = await resp.text()
                        snippet = body[:MAX_BODY_SNIPPET]
                    except Exception:
                        snippet = ""
                self.network.append({
                    "ts": round(time.time() - self.started_at, 3),
                    "kind": "response",
                    "status": resp.status,
                    "url": resp.url,
                    "body_snippet": snippet,
                })
            except Exception:
                pass

        page.on("console", on_console)
        page.on("pageerror", on_pageerror)
        page.on("request", on_request)
        page.on("response", lambda r: asyncio.create_task(on_response(r)))

    # --- screenshots --------------------------------------------------------
    async def snap(self, page, label: str) -> None:
        try:
            data = await page.screenshot(type="jpeg", quality=SCREENSHOT_JPEG_QUALITY,
                                         full_page=False, timeout=5000)
            b64 = base64.b64encode(data).decode("ascii")
            self.screenshots.append({
                "ts": round(time.time() - self.started_at, 3),
                "label": label,
                "url": page.url,
                "b64_jpeg": b64,
                "size": len(data),
            })
        except Exception as e:
            logger.warning("snap failed (%s): %s", label, e)

    async def finalize(self, page) -> None:
        try:
            self.final_url = page.url
            html = await page.content()
            self.final_html = html[:MAX_HTML_DUMP]
        except Exception as e:
            logger.warning("finalize html dump failed: %s", e)
        await self.snap(page, "final")

    def to_json(self) -> dict:
        return {
            "url": self.url,
            "final_url": self.final_url,
            "duration_s": round(time.time() - self.started_at, 3),
            "steps": self.steps,
            "console": self.console,
            "errors": self.errors,
            "network": self.network,
            "screenshots": self.screenshots,
            "final_html": self.final_html,
        }


@asynccontextmanager
async def open_page(url: str, recorder: Optional[Recorder] = None):
    async with async_playwright() as p:
        browser = await p.chromium.launch(
            headless=HEADLESS,
            args=["--disable-blink-features=AutomationControlled"],
        )
        context = await browser.new_context(
            viewport=ViewportSize({"width": BROWSER_WIDTH, "height": BROWSER_HEIGHT}),
            locale=BROWSER_LOCALE,
        )
        page = await context.new_page()

        if recorder:
            recorder._attach(page)
            recorder.step("launch", detail=f"headless={HEADLESS}")

        if recorder:
            recorder.step("goto", detail=url)
        await page.goto(url)
        await page.wait_for_load_state("networkidle")
        if recorder:
            recorder.step("loaded", detail=page.url)
            await recorder.snap(page, "loaded")

        try:
            yield page
        finally:
            if recorder:
                try:
                    await recorder.finalize(page)
                except Exception:
                    logger.exception("recorder.finalize failed")
            await page.wait_for_timeout(POST_SUBMISSION_SLEEP_MS)
            await browser.close()


def create_dummy_pdf():
    logger.info("creating dummy pdf")
    c = canvas.Canvas("DummyPDF.pdf")
    c.drawString(100, 750, "Hello! This is a dummy PDF file.")
    c.save()