package docs

import (
	"bytes"
	"encoding/json"
	"os"
	"path/filepath"

	"github.com/cloudquery/plugin-sdk/v4/schema"
)

type jsonTable struct {
	Name              string       `json:"name"`
	Title             string       `json:"title"`
	Description       string       `json:"description"`
	Columns           []jsonColumn `json:"columns"`
	Relations         []jsonTable  `json:"relations"`
	IsPaid            bool         `json:"is_paid,omitempty"`
	IsIncremental     bool         `json:"is_incremental,omitempty"`
	PermissionsNeeded []string     `json:"permissions_needed,omitempty"`
}

type jsonColumn struct {
	Name                  string `json:"name"`
	Type                  string `json:"type"`
	IsPrimaryKey          bool   `json:"is_primary_key,omitempty"`
	IsIncrementalKey      bool   `json:"is_incremental_key,omitempty"`
	IsPrimaryKeyComponent bool   `json:"is_primary_key_component,omitempty"`
	TypeSchema            string `json:"type_schema,omitempty"`
}

func (g *Generator) renderTablesAsJSON(dir string) error {
	jsonTables := g.jsonifyTables(g.tables)
	buffer := &bytes.Buffer{}
	m := json.NewEncoder(buffer)
	m.SetIndent("", "  ")
	m.SetEscapeHTML(false)
	err := m.Encode(jsonTables)
	if err != nil {
		return err
	}
	outputPath := filepath.Join(dir, "__tables.json")
	return os.WriteFile(outputPath, buffer.Bytes(), 0644)
}

func (g *Generator) jsonifyTables(tables schema.Tables) []jsonTable {
	jsonTables := make([]jsonTable, len(tables))
	for i, table := range tables {
		jsonColumns := make([]jsonColumn, len(table.Columns))
		for c, col := range table.Columns {
			jsonColumns[c] = jsonColumn{
				Name:       col.Name,
				Type:       col.Type.String(),
				TypeSchema: col.TypeSchema,
				// Technically this would enable the UI to continue to show the underlying PK columns
				// This is a short term hack
				IsPrimaryKey:          (col.PrimaryKey && !(col.Name == schema.CqIDColumn.Name && len(table.PrimaryKeyComponents()) > 0)) || col.PrimaryKeyComponent,
				IsPrimaryKeyComponent: col.PrimaryKeyComponent,
				IsIncrementalKey:      col.IncrementalKey,
			}
		}
		jsonTables[i] = jsonTable{
			Name:              table.Name,
			Title:             table.Title,
			Description:       table.Description,
			Columns:           jsonColumns,
			IsPaid:            table.IsPaid,
			IsIncremental:     table.IsIncremental,
			Relations:         g.jsonifyTables(table.Relations),
			PermissionsNeeded: table.PermissionsNeeded,
		}
	}
	return jsonTables
}