import { z } from "zod";
import { withAuth, getApiClient, getSessionCredentials, getCommonParams } from "../../auth/index.js";
import { normalizeSchemaForSave, mergeTableSchemas } from "../../utils/fieldHelpers.js";
import { handleToolError, validateRequired, handleApiResponse } from "../helpers/errorHandler.js";
import { AcaiHttpClient } from "../helpers/acaiHttpClient.js";
import { withAuthParams } from "../helpers/authSchema.js";

export function registerGetTableSchemaTool(server) {
    server.tool(
        "get_table_schema",
        "Get the schema of a database table. Tables WITHOUT 'cms_' prefix. Primary key is 'num', NEVER 'id'. Use minimal=true for just field names + types (saves tokens).",
        withAuthParams({
            tableName: z.string().describe("Name of the table to get schema for (without 'cms_' prefix)"),
            minimal: z.boolean().optional().describe("If true, returns only field names and types (compact). Default: false (full schema with all metadata)."),
        }),
        { readOnlyHint: true, destructiveHint: false },
        withAuth(async ({ tableName, minimal }, extra) => {
            try {
                // Validate required parameters
                const validationError = validateRequired({ tableName }, ['tableName'], 'get_table_schema');
                if (validationError) return validationError;

                const credentials = await getSessionCredentials(extra.sessionId);
                const response = await AcaiHttpClient.saasPostRequest(
                    {
                        id: tableName
                    },
                    credentials.token
                );

                if (!response.data.success) {
                    return {
                        content: [{ type: "text", text: "Error getting schema: " + JSON.stringify(response.data) }],
                        isError: true,
                    };
                }

                // Find the specific table
                const table = response.data.data;

                if (!table) {
                    return {
                        content: [{ type: "text", text: `Table '${tableName}' not found` }],
                        isError: true,
                    };
                }

                // Minimal mode: return only field names, types, and key metadata
                if (minimal) {
                    const minimalSchema = {};
                    for (const [key, value] of Object.entries(table)) {
                        if (value && typeof value === 'object' && value.type) {
                            const field = { type: value.type };
                            if (value.label) field.label = value.label;
                            if (value.optionsType) field.optionsType = value.optionsType;
                            if (value.optionsTablename) field.optionsTablename = value.optionsTablename;
                            if (value.isRequired) field.isRequired = value.isRequired;
                            minimalSchema[key] = field;
                        } else if (typeof value !== 'object') {
                            // Keep top-level scalar metadata (menuName, menuType, enlace, etc.)
                            minimalSchema[key] = value;
                        }
                    }
                    return {
                        content: [{ type: "text", text: JSON.stringify(minimalSchema, null, 2) }],
                    };
                }

                return {
                    content: [{ type: "text", text: JSON.stringify(table, null, 2) }],
                };
            } catch (error) {
                return handleToolError(error, 'get_table_schema', { tableName });
            }
        })
    );
}

export function registerUpdateTableSchemaTool(server) {
    server.tool(
        "update_table_schema",
        `Update table-level metadata (menuName, menuOrder, enlace, seo_metas). NOT for field operations — use edit_table_field instead.

    Tables WITHOUT 'cms_' prefix. 2-step process: saves to SAAS server, then triggers website schema update.`,
        withAuthParams({
            tableName: z.string().describe("Name of the table to update"),
            schema: z.object({}).passthrough().describe("Schema object with fields objects ( like reference schema table ) to add or update. By default, this is merged with the existing schema."),
            overwrite: z.boolean().optional().describe("If true, replaces the ENTIRE schema with the provided one (deleting missing fields). If false (default), merges with existing schema."),
        }),
        { readOnlyHint: false, destructiveHint: false },
        withAuth(async ({ tableName, schema, overwrite = false }, extra) => {
            try {
                // Validate required parameters
                const validationError = validateRequired({ tableName, schema }, ['tableName', 'schema'], 'update_table_schema');
                if (validationError) return validationError;

                let schemaToSave;

                const credentials = await getSessionCredentials(extra.sessionId);

                if (overwrite) {
                    // If overwrite is true, use the provided schema directly
                    schemaToSave = { ...schema };
                } else {
                    // Step 1: Fetch current schema to preserve existing fields
                    const getResponse = await AcaiHttpClient.saasPostRequest(
                        {
                            id: tableName
                        },
                        credentials.token
                    );

                    if (!getResponse.data.success) {
                        return {
                            content: [{ type: "text", text: "Error fetching current schema: " + JSON.stringify(getResponse.data) }],
                            isError: true,
                        };
                    }

                    const currentTable = getResponse.data.data;

                    if (!currentTable) {
                        return {
                            content: [{ type: "text", text: `Table '${tableName}' not found. Please create it first using create_table.` }],
                            isError: true,
                        };
                    }

                    // Step 2: Merge new schema into existing schema
                    schemaToSave = mergeTableSchemas(currentTable, schema);
                }

                normalizeSchemaForSave(schemaToSave);

                // Remove tableName from schema (as done in frontend)
                delete schemaToSave.tableName;

                // Step 3: Save merged schema to SAAS server (PUT request)
                const saasResponse = await AcaiHttpClient.saasPutRequest(
                    {
                        action: "saveSchema",
                        schema: schemaToSave,
                        id: tableName,
                    },
                    credentials.token
                );

                // SAAS returns {success: true} not {result: true}
                if (!saasResponse.data.success && !saasResponse.data.result) {
                    return {
                        content: [{ type: "text", text: "Error saving schema to SAAS: " + JSON.stringify(saasResponse.data) }],
                        isError: true,
                    };
                }

                // Step 4: Trigger schema update on website
                const client = await getApiClient(extra.sessionId);
                const updateResponse = await client.post("/cms/lib/viewer_functions.php", await getCommonParams(extra.sessionId, {
                    action_ws: "updateAllSchemas",
                    tokenHash: credentials.tokenHash
                }));

                // Check for website update errors
                let updateError = handleApiResponse(updateResponse.data, 'update_table_schema');
                if (updateError) return updateError;

                return {
                    content: [{
                        type: "text",
                        text: JSON.stringify({
                            success: true,
                            message: overwrite ? "Schema overwritten successfully" : "Schema updated successfully (merged with existing fields)",
                            mergedFields: Object.keys(schemaToSave),
                            saasResponse: saasResponse.data,
                            webResponse: updateResponse.data
                        }, null, 2)
                    }],
                };
            } catch (error) {
                return handleToolError(error, 'update_table_schema', { tableName, overwrite });
            }
        })
    );
}