/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import type React from 'react';
import { useMemo, useCallback } from 'react';
import { Box, Text } from 'ink';
import { DiffRenderer } from './DiffRenderer.js';
import { RenderInline } from '../../utils/InlineMarkdownRenderer.js';
import {
  type SerializableConfirmationDetails,
  type ToolCallConfirmationDetails,
  type Config,
  ToolConfirmationOutcome,
  hasRedirection,
  debugLogger,
} from '@google/gemini-cli-core';
import type { RadioSelectItem } from '../shared/RadioButtonSelect.js';
import { useToolActions } from '../../contexts/ToolActionsContext.js';
import { RadioButtonSelect } from '../shared/RadioButtonSelect.js';
import { MaxSizedBox, MINIMUM_MAX_HEIGHT } from '../shared/MaxSizedBox.js';
import { sanitizeForDisplay } from '../../utils/textUtils.js';
import { useKeypress } from '../../hooks/useKeypress.js';
import { theme } from '../../semantic-colors.js';
import { useSettings } from '../../contexts/SettingsContext.js';
import {
  REDIRECTION_WARNING_NOTE_LABEL,
  REDIRECTION_WARNING_NOTE_TEXT,
  REDIRECTION_WARNING_TIP_LABEL,
  REDIRECTION_WARNING_TIP_TEXT,
} from '../../textConstants.js';

export interface ToolConfirmationMessageProps {
  callId: string;
  confirmationDetails:
    | ToolCallConfirmationDetails
    | SerializableConfirmationDetails;
  config: Config;
  isFocused?: boolean;
  availableTerminalHeight?: number;
  terminalWidth: number;
}

export const ToolConfirmationMessage: React.FC<
  ToolConfirmationMessageProps
> = ({
  callId,
  confirmationDetails,
  config,
  isFocused = true,
  availableTerminalHeight,
  terminalWidth,
}) => {
  const { confirm, isDiffingEnabled } = useToolActions();

  const settings = useSettings();
  const allowPermanentApproval =
    settings.merged.security.enablePermanentToolApproval;

  const handleConfirm = useCallback(
    (outcome: ToolConfirmationOutcome) => {
      void confirm(callId, outcome).catch((error) => {
        debugLogger.error(
          `Failed to handle tool confirmation for ${callId}:`,
          error,
        );
      });
    },
    [confirm, callId],
  );

  const isTrustedFolder = config.isTrustedFolder();

  useKeypress(
    (key) => {
      if (!isFocused) return false;
      if (key.name === 'escape' || (key.ctrl && key.name === 'c')) {
        handleConfirm(ToolConfirmationOutcome.Cancel);
        return true;
      }
      return false;
    },
    { isActive: isFocused },
  );

  const handleSelect = useCallback(
    (item: ToolConfirmationOutcome) => handleConfirm(item),
    [handleConfirm],
  );

  const getOptions = useCallback(() => {
    const options: Array<RadioSelectItem<ToolConfirmationOutcome>> = [];

    if (confirmationDetails.type === 'edit') {
      if (!confirmationDetails.isModifying) {
        options.push({
          label: 'Allow once',
          value: ToolConfirmationOutcome.ProceedOnce,
          key: 'Allow once',
        });
        if (isTrustedFolder) {
          options.push({
            label: 'Allow for this session',
            value: ToolConfirmationOutcome.ProceedAlways,
            key: 'Allow for this session',
          });
          if (allowPermanentApproval) {
            options.push({
              label: 'Allow for all future sessions',
              value: ToolConfirmationOutcome.ProceedAlwaysAndSave,
              key: 'Allow for all future sessions',
            });
          }
        }
        // We hide "Modify with external editor" if IDE mode is active AND
        // the IDE is actually capable of showing a diff (connected).
        if (!config.getIdeMode() || !isDiffingEnabled) {
          options.push({
            label: 'Modify with external editor',
            value: ToolConfirmationOutcome.ModifyWithEditor,
            key: 'Modify with external editor',
          });
        }

        options.push({
          label: 'No, suggest changes (esc)',
          value: ToolConfirmationOutcome.Cancel,
          key: 'No, suggest changes (esc)',
        });
      }
    } else if (confirmationDetails.type === 'exec') {
      options.push({
        label: 'Allow once',
        value: ToolConfirmationOutcome.ProceedOnce,
        key: 'Allow once',
      });
      if (isTrustedFolder) {
        options.push({
          label: `Allow for this session`,
          value: ToolConfirmationOutcome.ProceedAlways,
          key: `Allow for this session`,
        });
        if (allowPermanentApproval) {
          options.push({
            label: `Allow for all future sessions`,
            value: ToolConfirmationOutcome.ProceedAlwaysAndSave,
            key: `Allow for all future sessions`,
          });
        }
      }
      options.push({
        label: 'No, suggest changes (esc)',
        value: ToolConfirmationOutcome.Cancel,
        key: 'No, suggest changes (esc)',
      });
    } else if (confirmationDetails.type === 'info') {
      options.push({
        label: 'Allow once',
        value: ToolConfirmationOutcome.ProceedOnce,
        key: 'Allow once',
      });
      if (isTrustedFolder) {
        options.push({
          label: 'Allow for this session',
          value: ToolConfirmationOutcome.ProceedAlways,
          key: 'Allow for this session',
        });
        if (allowPermanentApproval) {
          options.push({
            label: 'Allow for all future sessions',
            value: ToolConfirmationOutcome.ProceedAlwaysAndSave,
            key: 'Allow for all future sessions',
          });
        }
      }
      options.push({
        label: 'No, suggest changes (esc)',
        value: ToolConfirmationOutcome.Cancel,
        key: 'No, suggest changes (esc)',
      });
    } else {
      // mcp tool confirmation
      options.push({
        label: 'Allow once',
        value: ToolConfirmationOutcome.ProceedOnce,
        key: 'Allow once',
      });
      if (isTrustedFolder) {
        options.push({
          label: 'Allow tool for this session',
          value: ToolConfirmationOutcome.ProceedAlwaysTool,
          key: 'Allow tool for this session',
        });
        options.push({
          label: 'Allow all server tools for this session',
          value: ToolConfirmationOutcome.ProceedAlwaysServer,
          key: 'Allow all server tools for this session',
        });
        if (allowPermanentApproval) {
          options.push({
            label: 'Allow tool for all future sessions',
            value: ToolConfirmationOutcome.ProceedAlwaysAndSave,
            key: 'Allow tool for all future sessions',
          });
        }
      }
      options.push({
        label: 'No, suggest changes (esc)',
        value: ToolConfirmationOutcome.Cancel,
        key: 'No, suggest changes (esc)',
      });
    }
    return options;
  }, [
    confirmationDetails,
    isTrustedFolder,
    allowPermanentApproval,
    config,
    isDiffingEnabled,
  ]);

  const availableBodyContentHeight = useCallback(() => {
    if (availableTerminalHeight === undefined) {
      return undefined;
    }

    // Calculate the vertical space (in lines) consumed by UI elements
    // surrounding the main body content.
    const PADDING_OUTER_Y = 2; // Main container has `padding={1}` (top & bottom).
    const MARGIN_BODY_BOTTOM = 1; // margin on the body container.
    const HEIGHT_QUESTION = 1; // The question text is one line.
    const MARGIN_QUESTION_BOTTOM = 1; // Margin on the question container.

    const optionsCount = getOptions().length;

    const surroundingElementsHeight =
      PADDING_OUTER_Y +
      MARGIN_BODY_BOTTOM +
      HEIGHT_QUESTION +
      MARGIN_QUESTION_BOTTOM +
      optionsCount;

    return Math.max(availableTerminalHeight - surroundingElementsHeight, 1);
  }, [availableTerminalHeight, getOptions]);

  const { question, bodyContent, options } = useMemo(() => {
    let bodyContent: React.ReactNode | null = null;
    let question = '';
    const options = getOptions();

    if (confirmationDetails.type === 'edit') {
      if (!confirmationDetails.isModifying) {
        question = `Apply this change?`;
      }
    } else if (confirmationDetails.type === 'exec') {
      const executionProps = confirmationDetails;

      if (executionProps.commands && executionProps.commands.length > 1) {
        question = `Allow execution of ${executionProps.commands.length} commands?`;
      } else {
        question = `Allow execution of: '${sanitizeForDisplay(executionProps.rootCommand)}'?`;
      }
    } else if (confirmationDetails.type === 'info') {
      question = `Do you want to proceed?`;
    } else {
      // mcp tool confirmation
      const mcpProps = confirmationDetails;
      question = `Allow execution of MCP tool "${mcpProps.toolName}" from server "${mcpProps.serverName}"?`;
    }

    if (confirmationDetails.type === 'edit') {
      if (!confirmationDetails.isModifying) {
        bodyContent = (
          <DiffRenderer
            diffContent={confirmationDetails.fileDiff}
            filename={confirmationDetails.fileName}
            availableTerminalHeight={availableBodyContentHeight()}
            terminalWidth={terminalWidth}
          />
        );
      }
    } else if (confirmationDetails.type === 'exec') {
      const executionProps = confirmationDetails;

      const commandsToDisplay =
        executionProps.commands && executionProps.commands.length > 1
          ? executionProps.commands
          : [executionProps.command];
      const containsRedirection = commandsToDisplay.some((cmd) =>
        hasRedirection(cmd),
      );

      let bodyContentHeight = availableBodyContentHeight();
      let warnings: React.ReactNode = null;

      if (bodyContentHeight !== undefined) {
        bodyContentHeight -= 2; // Account for padding;
      }

      if (containsRedirection) {
        // Calculate lines needed for Note and Tip
        const safeWidth = Math.max(terminalWidth, 1);
        const noteLength =
          REDIRECTION_WARNING_NOTE_LABEL.length +
          REDIRECTION_WARNING_NOTE_TEXT.length;
        const tipLength =
          REDIRECTION_WARNING_TIP_LABEL.length +
          REDIRECTION_WARNING_TIP_TEXT.length;

        const noteLines = Math.ceil(noteLength / safeWidth);
        const tipLines = Math.ceil(tipLength / safeWidth);
        const spacerLines = 1;
        const warningHeight = noteLines + tipLines + spacerLines;

        if (bodyContentHeight !== undefined) {
          bodyContentHeight = Math.max(
            bodyContentHeight - warningHeight,
            MINIMUM_MAX_HEIGHT,
          );
        }

        warnings = (
          <>
            <Box height={1} />
            <Box>
              <Text color={theme.text.primary}>
                <Text bold>{REDIRECTION_WARNING_NOTE_LABEL}</Text>
                {REDIRECTION_WARNING_NOTE_TEXT}
              </Text>
            </Box>
            <Box>
              <Text color={theme.border.default}>
                <Text bold>{REDIRECTION_WARNING_TIP_LABEL}</Text>
                {REDIRECTION_WARNING_TIP_TEXT}
              </Text>
            </Box>
          </>
        );
      }

      bodyContent = (
        <Box flexDirection="column">
          <MaxSizedBox
            maxHeight={bodyContentHeight}
            maxWidth={Math.max(terminalWidth, 1)}
          >
            <Box flexDirection="column">
              {commandsToDisplay.map((cmd, idx) => (
                <Text key={idx} color={theme.text.link}>
                  {sanitizeForDisplay(cmd)}
                </Text>
              ))}
            </Box>
          </MaxSizedBox>
          {warnings}
        </Box>
      );
    } else if (confirmationDetails.type === 'info') {
      const infoProps = confirmationDetails;
      const displayUrls =
        infoProps.urls &&
        !(
          infoProps.urls.length === 1 && infoProps.urls[0] === infoProps.prompt
        );

      bodyContent = (
        <Box flexDirection="column">
          <Text color={theme.text.link}>
            <RenderInline
              text={infoProps.prompt}
              defaultColor={theme.text.link}
            />
          </Text>
          {displayUrls && infoProps.urls && infoProps.urls.length > 0 && (
            <Box flexDirection="column" marginTop={1}>
              <Text color={theme.text.primary}>URLs to fetch:</Text>
              {infoProps.urls.map((url) => (
                <Text key={url}>
                  {' '}
                  - <RenderInline text={url} />
                </Text>
              ))}
            </Box>
          )}
        </Box>
      );
    } else {
      // mcp tool confirmation
      const mcpProps = confirmationDetails;

      bodyContent = (
        <Box flexDirection="column">
          <Text color={theme.text.link}>MCP Server: {mcpProps.serverName}</Text>
          <Text color={theme.text.link}>Tool: {mcpProps.toolName}</Text>
        </Box>
      );
    }

    return { question, bodyContent, options };
  }, [
    confirmationDetails,
    getOptions,
    availableBodyContentHeight,
    terminalWidth,
  ]);

  if (confirmationDetails.type === 'edit') {
    if (confirmationDetails.isModifying) {
      return (
        <Box
          width={terminalWidth}
          borderStyle="round"
          borderColor={theme.border.default}
          justifyContent="space-around"
          paddingTop={1}
          paddingBottom={1}
          overflow="hidden"
        >
          <Text color={theme.text.primary}>Modify in progress: </Text>
          <Text color={theme.status.success}>
            Save and close external editor to continue
          </Text>
        </Box>
      );
    }
  }

  return (
    <Box flexDirection="column" paddingTop={0} paddingBottom={1}>
      {/* Body Content (Diff Renderer or Command Info) */}
      {/* No separate context display here anymore for edits */}
      <Box flexGrow={1} flexShrink={1} overflow="hidden" marginBottom={1}>
        <MaxSizedBox
          maxHeight={availableBodyContentHeight()}
          maxWidth={terminalWidth}
          overflowDirection="top"
        >
          {bodyContent}
        </MaxSizedBox>
      </Box>

      {/* Confirmation Question */}
      <Box marginBottom={1} flexShrink={0}>
        <Text color={theme.text.primary}>{question}</Text>
      </Box>

      {/* Select Input for Options */}
      <Box flexShrink={0}>
        <RadioButtonSelect
          items={options}
          onSelect={handleSelect}
          isFocused={isFocused}
        />
      </Box>
    </Box>
  );
};
