"""
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
MAX_SCREENSHOTS = 40
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 + html dump -------------------------------------------
    async def snap(self, page, label: str) -> None:
        """Capture screenshot + full page HTML for this moment."""
        if len(self.screenshots) >= MAX_SCREENSHOTS:
            return
        ts = round(time.time() - self.started_at, 3)
        entry = {"ts": ts, "label": label, "url": page.url,
                 "b64_jpeg": "", "size": 0, "html": "", "html_size": 0}
        try:
            img = await page.screenshot(type="jpeg", quality=SCREENSHOT_JPEG_QUALITY,
                                        full_page=False, timeout=5000)
            entry["b64_jpeg"] = base64.b64encode(img).decode("ascii")
            entry["size"] = len(img)
        except Exception as e:
            logger.warning("snap screenshot failed (%s): %s", label, e)
        try:
            html = await page.content()
            entry["html"] = html[:MAX_HTML_DUMP]
            entry["html_size"] = len(html)
        except Exception as e:
            logger.warning("snap html failed (%s): %s", label, e)
        self.screenshots.append(entry)

    async def step_snap(self, page, name: str, detail: str = "", status: str = "ok") -> None:
        """Log a step AND capture a screenshot + HTML for it."""
        self.step(name, status, detail)
        await self.snap(page, name)

    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)
        goto_failed = False
        try:
            await page.goto(url, timeout=45_000)
        except Exception as e:
            goto_failed = True
            if recorder:
                recorder.step("goto.failed", "error", f"{type(e).__name__}: {e}")
                try:
                    await recorder.snap(page, "goto.failed")
                except Exception:
                    logger.exception("snap after goto.failed failed")
        if not goto_failed:
            try:
                await page.wait_for_load_state("networkidle", timeout=15_000)
            except Exception:
                pass
            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")
            try:
                await page.wait_for_timeout(POST_SUBMISSION_SLEEP_MS)
            except Exception:
                pass
            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()