package extractor

import (
	"context"
	"fmt"
	"time"

	"github.com/playwright-community/playwright-go"
)

// InteractiveBrowser provides low-level page control for interactive browser sessions.
// Unlike Browser which is designed for scraping, InteractiveBrowser exposes mouse, keyboard,
// screenshot, and navigation APIs suitable for remote browser control.
type InteractiveBrowser interface {
	// Navigate goes to the given URL and returns the final URL after any redirects.
	Navigate(url string) (string, error)
	// GoBack navigates back in history. Returns the final URL.
	GoBack() (string, error)
	// GoForward navigates forward in history. Returns the final URL.
	GoForward() (string, error)
	// URL returns the current page URL.
	URL() string

	// MouseClick clicks at the given coordinates with the specified button ("left", "middle", "right").
	MouseClick(x, y float64, button string) error
	// MouseMove moves the mouse to the given coordinates.
	MouseMove(x, y float64) error
	// MouseWheel scrolls by the given delta.
	MouseWheel(deltaX, deltaY float64) error

	// KeyboardType types the given text as if it were entered character by character.
	KeyboardType(text string) error
	// KeyboardPress presses a special key (e.g. "Enter", "Tab", "Backspace").
	KeyboardPress(key string) error
	// KeyboardInsertText inserts text directly into the focused element by dispatching
	// only an input event (no keydown, keypress, or keyup). This is more reliable than
	// KeyboardType for pasting into password fields and custom input components.
	KeyboardInsertText(text string) error

	// Screenshot takes a full-page screenshot as JPEG with the given quality (0-100).
	Screenshot(quality int) ([]byte, error)

	// Cookies returns all cookies from the browser context.
	Cookies() ([]Cookie, error)

	// Close tears down the browser.
	Close() error
}

type interactiveBrowser struct {
	pw      *playwright.Playwright
	browser playwright.Browser
	ctx     playwright.BrowserContext
	page    playwright.Page
}

// NewInteractiveBrowser creates a headless browser with a page ready for interactive control.
// The context is only used for cancellation during setup.
func NewInteractiveBrowser(ctx context.Context, opts ...PlayWrightBrowserOptions) (InteractiveBrowser, error) {
	var thirtySeconds = 30 * time.Second
	opt := PlayWrightBrowserOptions{
		UserAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:142.0) Gecko/20100101 Firefox/142.0",
		Browser:   PlayWrightBrowserSelectionChromium,
		Timeout:   &thirtySeconds,
		Dimensions: Size{
			Width:  1280,
			Height: 720,
		},
	}

	for _, o := range opts {
		if o.UserAgent != "" {
			opt.UserAgent = o.UserAgent
		}
		if o.Browser != "" {
			opt.Browser = o.Browser
		}
		if o.Timeout != nil {
			opt.Timeout = o.Timeout
		}
		if o.CookieJar != nil {
			opt.CookieJar = o.CookieJar
		}
		if o.Dimensions.Width > 0 && o.Dimensions.Height > 0 {
			opt.Dimensions = o.Dimensions
		}
		if o.DarkMode {
			opt.DarkMode = true
		}
		if o.PlayWrightServerAddress != "" {
			opt.PlayWrightServerAddress = o.PlayWrightServerAddress
		}
		if o.DontLaunchOnConnectFailure {
			opt.DontLaunchOnConnectFailure = true
		}
		if o.UseLocalOnly {
			opt.UseLocalOnly = true
		}
		opt.ShowBrowser = o.ShowBrowser
	}

	if err := ctx.Err(); err != nil {
		return nil, err
	}

	type result struct {
		ib  InteractiveBrowser
		err error
	}

	ch := make(chan result, 1)

	go func() {
		pw, err := playwright.Run()
		if err != nil {
			err = playwright.Install()
			if err != nil {
				ch <- result{nil, fmt.Errorf("failed to install playwright: %w", err)}
				return
			}
			pw, err = playwright.Run()
			if err != nil {
				ch <- result{nil, fmt.Errorf("failed to start playwright: %w", err)}
				return
			}
		}

		var bt playwright.BrowserType
		switch opt.Browser {
		case PlayWrightBrowserSelectionChromium:
			bt = pw.Chromium
		case PlayWrightBrowserSelectionFirefox:
			bt = pw.Firefox
		case PlayWrightBrowserSelectionWebKit:
			bt = pw.WebKit
		default:
			ch <- result{nil, ErrInvalidBrowserSelection}
			return
		}

		var browser playwright.Browser
		var launch = true

		if opt.PlayWrightServerAddress != "" && !opt.UseLocalOnly {
			launch = false
			var timeout float64 = 30000
			browser, err = bt.Connect(opt.PlayWrightServerAddress, playwright.BrowserTypeConnectOptions{Timeout: &timeout})
			if err != nil {
				if opt.DontLaunchOnConnectFailure {
					ch <- result{nil, err}
					return
				}
				launch = true
			}
		}

		if launch {
			browser, err = bt.Launch(playwright.BrowserTypeLaunchOptions{
				Headless: playwright.Bool(!opt.ShowBrowser),
			})
			if err != nil {
				ch <- result{nil, fmt.Errorf("failed to launch browser: %w", err)}
				return
			}
		}

		viewport := &playwright.Size{
			Width:  opt.Dimensions.Width,
			Height: opt.Dimensions.Height,
		}

		var scheme *playwright.ColorScheme
		if opt.DarkMode {
			scheme = playwright.ColorSchemeDark
		} else {
			scheme = playwright.ColorSchemeNoPreference
		}

		bctx, err := browser.NewContext(playwright.BrowserNewContextOptions{
			UserAgent:   playwright.String(opt.UserAgent),
			Viewport:    viewport,
			ColorScheme: scheme,
		})
		if err != nil {
			ch <- result{nil, fmt.Errorf("failed to create browser context: %w", err)}
			return
		}

		if opt.CookieJar != nil {
			cookies, err := opt.CookieJar.GetAll()
			if err != nil {
				ch <- result{nil, fmt.Errorf("error getting cookies from cookie jar: %w", err)}
				return
			}
			pwCookies := make([]playwright.OptionalCookie, len(cookies))
			for i, c := range cookies {
				pwCookies[i] = cookieToPlaywrightOptionalCookie(c)
			}
			if err := bctx.AddCookies(pwCookies); err != nil {
				ch <- result{nil, fmt.Errorf("error adding cookies: %w", err)}
				return
			}
		}

		page, err := bctx.NewPage()
		if err != nil {
			ch <- result{nil, fmt.Errorf("failed to create page: %w", err)}
			return
		}

		ch <- result{
			ib: &interactiveBrowser{
				pw:      pw,
				browser: browser,
				ctx:     bctx,
				page:    page,
			},
		}
	}()

	select {
	case <-ctx.Done():
		return nil, ctx.Err()
	case r := <-ch:
		return r.ib, r.err
	}
}

func (ib *interactiveBrowser) Navigate(url string) (string, error) {
	resp, err := ib.page.Goto(url, playwright.PageGotoOptions{
		WaitUntil: playwright.WaitUntilStateLoad,
	})
	if err != nil {
		return "", fmt.Errorf("navigation failed: %w", err)
	}
	_ = resp
	return ib.page.URL(), nil
}

func (ib *interactiveBrowser) GoBack() (string, error) {
	_, err := ib.page.GoBack()
	if err != nil {
		return ib.page.URL(), fmt.Errorf("go back failed: %w", err)
	}
	return ib.page.URL(), nil
}

func (ib *interactiveBrowser) GoForward() (string, error) {
	_, err := ib.page.GoForward()
	if err != nil {
		return ib.page.URL(), fmt.Errorf("go forward failed: %w", err)
	}
	return ib.page.URL(), nil
}

func (ib *interactiveBrowser) URL() string {
	return ib.page.URL()
}

func (ib *interactiveBrowser) MouseClick(x, y float64, button string) error {
	var btn *playwright.MouseButton
	switch button {
	case "right":
		btn = playwright.MouseButtonRight
	case "middle":
		btn = playwright.MouseButtonMiddle
	default:
		btn = playwright.MouseButtonLeft
	}
	return ib.page.Mouse().Click(x, y, playwright.MouseClickOptions{Button: btn})
}

func (ib *interactiveBrowser) MouseMove(x, y float64) error {
	return ib.page.Mouse().Move(x, y)
}

func (ib *interactiveBrowser) MouseWheel(deltaX, deltaY float64) error {
	return ib.page.Mouse().Wheel(deltaX, deltaY)
}

func (ib *interactiveBrowser) KeyboardType(text string) error {
	return ib.page.Keyboard().Type(text)
}

func (ib *interactiveBrowser) KeyboardPress(key string) error {
	return ib.page.Keyboard().Press(key)
}

func (ib *interactiveBrowser) KeyboardInsertText(text string) error {
	return ib.page.Keyboard().InsertText(text)
}

func (ib *interactiveBrowser) Screenshot(quality int) ([]byte, error) {
	return ib.page.Screenshot(playwright.PageScreenshotOptions{
		Type:    playwright.ScreenshotTypeJpeg,
		Quality: playwright.Int(quality),
	})
}

func (ib *interactiveBrowser) Cookies() ([]Cookie, error) {
	pwCookies, err := ib.ctx.Cookies()
	if err != nil {
		return nil, fmt.Errorf("failed to get cookies: %w", err)
	}

	cookies := make([]Cookie, len(pwCookies))
	for i, c := range pwCookies {
		cookies[i] = playwrightCookieToCookie(c)
	}
	return cookies, nil
}

func (ib *interactiveBrowser) Close() error {
	var errs []error
	if ib.page != nil {
		if err := ib.page.Close(); err != nil {
			errs = append(errs, err)
		}
	}
	if ib.ctx != nil {
		if err := ib.ctx.Close(); err != nil {
			errs = append(errs, err)
		}
	}
	if ib.browser != nil {
		if err := ib.browser.Close(); err != nil {
			errs = append(errs, err)
		}
	}
	if ib.pw != nil {
		if err := ib.pw.Stop(); err != nil {
			errs = append(errs, err)
		}
	}
	if len(errs) > 0 {
		return fmt.Errorf("errors during close: %v", errs)
	}
	return nil
}