// Base Section Component for config form sections
// Used as a foundation for reusable section components

import { useMemo, useCallback, useState } from "react";
import useSWR from "swr";
import axios from "axios";
import { toast } from "sonner";
import { useTranslation } from "react-i18next";
import { ConfigForm } from "../ConfigForm";
import {
  useConfigOverride,
  normalizeConfigValue,
} from "@/hooks/use-config-override";
import { useSectionSchema } from "@/hooks/use-config-schema";
import type { FrigateConfig } from "@/types/frigateConfig";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import {
  LuRotateCcw,
  LuSave,
  LuChevronDown,
  LuChevronRight,
} from "react-icons/lu";
import Heading from "@/components/ui/heading";
import get from "lodash/get";
import unset from "lodash/unset";
import cloneDeep from "lodash/cloneDeep";
import isEqual from "lodash/isEqual";
import {
  Collapsible,
  CollapsibleContent,
  CollapsibleTrigger,
} from "@/components/ui/collapsible";
import { applySchemaDefaults } from "@/lib/config-schema";

export interface SectionConfig {
  /** Field ordering within the section */
  fieldOrder?: string[];
  /** Fields to group together */
  fieldGroups?: Record<string, string[]>;
  /** Fields to hide from UI */
  hiddenFields?: string[];
  /** Fields to show in advanced section */
  advancedFields?: string[];
}

export interface BaseSectionProps {
  /** Whether this is at global or camera level */
  level: "global" | "camera";
  /** Camera name (required if level is "camera") */
  cameraName?: string;
  /** Whether to show override indicator badge */
  showOverrideIndicator?: boolean;
  /** Custom section configuration */
  sectionConfig?: SectionConfig;
  /** Whether the section is disabled */
  disabled?: boolean;
  /** Whether the section is read-only */
  readonly?: boolean;
  /** Callback when settings are saved */
  onSave?: () => void;
  /** Whether a restart is required after changes */
  requiresRestart?: boolean;
  /** Whether section is collapsible */
  collapsible?: boolean;
  /** Default collapsed state */
  defaultCollapsed?: boolean;
  /** Whether to show the section title (default: false for global, true for camera) */
  showTitle?: boolean;
}

export interface CreateSectionOptions {
  /** The config path for this section (e.g., "detect", "record") */
  sectionPath: string;
  /** i18n namespace for this section (e.g., "config/detect") */
  i18nNamespace: string;
  /** Default section configuration */
  defaultConfig: SectionConfig;
}

/**
 * Factory function to create reusable config section components
 */
export function createConfigSection({
  sectionPath,
  i18nNamespace,
  defaultConfig,
}: CreateSectionOptions) {
  const ConfigSection = function ConfigSection({
    level,
    cameraName,
    showOverrideIndicator = true,
    sectionConfig = defaultConfig,
    disabled = false,
    readonly = false,
    onSave,
    requiresRestart = true,
    collapsible = false,
    defaultCollapsed = false,
    showTitle,
  }: BaseSectionProps) {
    const { t } = useTranslation([i18nNamespace, "views/settings", "common"]);
    const [isOpen, setIsOpen] = useState(!defaultCollapsed);
    const [pendingData, setPendingData] = useState<Record<
      string,
      unknown
    > | null>(null);
    const [isSaving, setIsSaving] = useState(false);

    // Default: show title for camera level (since it might be collapsible), hide for global
    const shouldShowTitle = showTitle ?? level === "camera";

    // Fetch config
    const { data: config, mutate: refreshConfig } =
      useSWR<FrigateConfig>("config");

    // Get section schema using cached hook
    const sectionSchema = useSectionSchema(sectionPath, level);

    // Get override status
    const { isOverridden, globalValue, cameraValue } = useConfigOverride({
      config,
      cameraName: level === "camera" ? cameraName : undefined,
      sectionPath,
    });

    // Get current form data
    const rawFormData = useMemo(() => {
      if (!config) return {};

      if (level === "camera" && cameraName) {
        return get(config.cameras?.[cameraName], sectionPath) || {};
      }

      return get(config, sectionPath) || {};
    }, [config, level, cameraName]);

    const sanitizeSectionData = useCallback(
      (data: Record<string, unknown>) => {
        const normalized = normalizeConfigValue(data) as Record<
          string,
          unknown
        >;
        if (
          !sectionConfig.hiddenFields ||
          sectionConfig.hiddenFields.length === 0
        ) {
          return normalized;
        }

        const cleaned = cloneDeep(normalized);
        sectionConfig.hiddenFields.forEach((path) => {
          if (!path) return;
          unset(cleaned, path);
        });
        return cleaned;
      },
      [sectionConfig.hiddenFields],
    );

    const formData = useMemo(() => {
      const baseData = sectionSchema
        ? applySchemaDefaults(sectionSchema, rawFormData)
        : rawFormData;
      return sanitizeSectionData(baseData);
    }, [rawFormData, sectionSchema, sanitizeSectionData]);

    // Track if there are unsaved changes
    const hasChanges = useMemo(() => {
      if (!pendingData) return false;
      return !isEqual(formData, pendingData);
    }, [formData, pendingData]);

    // Handle form data change
    const handleChange = useCallback(
      (data: Record<string, unknown>) => {
        const sanitizedData = sanitizeSectionData(data);
        if (isEqual(formData, sanitizedData)) {
          setPendingData(null);
          return;
        }
        setPendingData(sanitizedData);
      },
      [formData, sanitizeSectionData],
    );

    // Handle save button click
    const handleSave = useCallback(async () => {
      if (!pendingData) return;

      setIsSaving(true);
      try {
        const basePath =
          level === "camera" && cameraName
            ? `cameras.${cameraName}.${sectionPath}`
            : sectionPath;

        await axios.put("config/set", {
          requires_restart: requiresRestart ? 1 : 0,
          config_data: {
            [basePath]: pendingData,
          },
        });

        toast.success(
          t("toast.success", {
            ns: "views/settings",
            defaultValue: "Settings saved successfully",
          }),
        );

        setPendingData(null);
        refreshConfig();
        onSave?.();
      } catch (error) {
        // Parse Pydantic validation errors from API response
        if (axios.isAxiosError(error) && error.response?.data) {
          const responseData = error.response.data;
          if (responseData.detail && Array.isArray(responseData.detail)) {
            const validationMessages = responseData.detail
              .map((err: { loc?: string[]; msg?: string }) => {
                const field = err.loc?.slice(1).join(".") || "unknown";
                return `${field}: ${err.msg || "Invalid value"}`;
              })
              .join(", ");
            toast.error(
              t("toast.validationError", {
                ns: "views/settings",
                defaultValue: `Validation failed: ${validationMessages}`,
              }),
            );
          } else if (responseData.message) {
            toast.error(responseData.message);
          } else {
            toast.error(
              t("toast.error", {
                ns: "views/settings",
                defaultValue: "Failed to save settings",
              }),
            );
          }
        } else {
          toast.error(
            t("toast.error", {
              ns: "views/settings",
              defaultValue: "Failed to save settings",
            }),
          );
        }
      } finally {
        setIsSaving(false);
      }
    }, [
      pendingData,
      level,
      cameraName,
      requiresRestart,
      t,
      refreshConfig,
      onSave,
    ]);

    // Handle reset to global - removes camera-level override by deleting the section
    const handleResetToGlobal = useCallback(async () => {
      if (level !== "camera" || !cameraName) return;

      try {
        const basePath = `cameras.${cameraName}.${sectionPath}`;

        // Send empty string to delete the key from config (see update_yaml in backend)
        await axios.put("config/set", {
          requires_restart: requiresRestart ? 1 : 0,
          config_data: {
            [basePath]: "",
          },
        });

        toast.success(
          t("toast.resetSuccess", {
            ns: "views/settings",
            defaultValue: "Reset to global defaults",
          }),
        );

        setPendingData(null);
        refreshConfig();
      } catch {
        toast.error(
          t("toast.resetError", {
            ns: "views/settings",
            defaultValue: "Failed to reset settings",
          }),
        );
      }
    }, [level, cameraName, requiresRestart, t, refreshConfig]);

    if (!sectionSchema) {
      return null;
    }

    // Get section title from config namespace
    const title = t("label", {
      ns: i18nNamespace,
      defaultValue:
        sectionPath.charAt(0).toUpperCase() +
        sectionPath.slice(1).replace(/_/g, " "),
    });

    const sectionContent = (
      <div className="space-y-6">
        <ConfigForm
          schema={sectionSchema}
          formData={pendingData || formData}
          onChange={handleChange}
          fieldOrder={sectionConfig.fieldOrder}
          hiddenFields={sectionConfig.hiddenFields}
          advancedFields={sectionConfig.advancedFields}
          disabled={disabled || isSaving}
          readonly={readonly}
          showSubmit={false}
          i18nNamespace={i18nNamespace}
          formContext={{
            level,
            cameraName,
            globalValue,
            cameraValue,
          }}
        />

        {/* Save button */}
        <div className="flex items-center justify-between pt-2">
          <div className="flex items-center gap-2">
            {hasChanges && (
              <span className="text-sm text-muted-foreground">
                {t("unsavedChanges", {
                  ns: "views/settings",
                  defaultValue: "You have unsaved changes",
                })}
              </span>
            )}
          </div>
          <Button
            onClick={handleSave}
            disabled={!hasChanges || isSaving || disabled}
            className="gap-2"
          >
            <LuSave className="h-4 w-4" />
            {isSaving
              ? t("saving", { ns: "common", defaultValue: "Saving..." })
              : t("save", { ns: "common", defaultValue: "Save" })}
          </Button>
        </div>
      </div>
    );

    if (collapsible) {
      return (
        <Collapsible open={isOpen} onOpenChange={setIsOpen}>
          <div className="space-y-3">
            <CollapsibleTrigger asChild>
              <div className="flex cursor-pointer items-center justify-between">
                <div className="flex items-center gap-3">
                  {isOpen ? (
                    <LuChevronDown className="h-4 w-4 text-muted-foreground" />
                  ) : (
                    <LuChevronRight className="h-4 w-4 text-muted-foreground" />
                  )}
                  <Heading as="h4">{title}</Heading>
                  {showOverrideIndicator &&
                    level === "camera" &&
                    isOverridden && (
                      <Badge variant="secondary" className="text-xs">
                        {t("overridden", {
                          ns: "common",
                          defaultValue: "Overridden",
                        })}
                      </Badge>
                    )}
                  {hasChanges && (
                    <Badge variant="outline" className="text-xs">
                      {t("modified", {
                        ns: "common",
                        defaultValue: "Modified",
                      })}
                    </Badge>
                  )}
                </div>
                {level === "camera" && isOverridden && (
                  <Button
                    variant="ghost"
                    size="sm"
                    onClick={(e) => {
                      e.stopPropagation();
                      handleResetToGlobal();
                    }}
                    className="gap-2"
                  >
                    <LuRotateCcw className="h-4 w-4" />
                    {t("button.resetToGlobal", {
                      ns: "common",
                      defaultValue: "Reset to Global",
                    })}
                  </Button>
                )}
              </div>
            </CollapsibleTrigger>

            <CollapsibleContent>
              <div className="pl-7">{sectionContent}</div>
            </CollapsibleContent>
          </div>
        </Collapsible>
      );
    }

    return (
      <div className="space-y-3">
        {shouldShowTitle && (
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-3">
              <Heading as="h4">{title}</Heading>
              {showOverrideIndicator && level === "camera" && isOverridden && (
                <Badge variant="secondary" className="text-xs">
                  {t("overridden", {
                    ns: "common",
                    defaultValue: "Overridden",
                  })}
                </Badge>
              )}
              {hasChanges && (
                <Badge variant="outline" className="text-xs">
                  {t("modified", { ns: "common", defaultValue: "Modified" })}
                </Badge>
              )}
            </div>
            {level === "camera" && isOverridden && (
              <Button
                variant="ghost"
                size="sm"
                onClick={handleResetToGlobal}
                className="gap-2"
              >
                <LuRotateCcw className="h-4 w-4" />
                {t("button.resetToGlobal", {
                  ns: "common",
                  defaultValue: "Reset to Global",
                })}
              </Button>
            )}
          </div>
        )}

        {/* Reset button when title is hidden but we're at camera level with override */}
        {!shouldShowTitle && level === "camera" && isOverridden && (
          <div className="flex justify-end">
            <Button
              variant="ghost"
              size="sm"
              onClick={handleResetToGlobal}
              className="gap-2"
            >
              <LuRotateCcw className="h-4 w-4" />
              {t("button.resetToGlobal", {
                ns: "common",
                defaultValue: "Reset to Global",
              })}
            </Button>
          </div>
        )}

        {sectionContent}
      </div>
    );
  };

  return ConfigSection;
}