/*:
# PangaeaClient
**PangaeaClient Playground**

Please first build the PangaeaClient framework.
This playground obtains data from https://www.pangaea.de and displays
the first 20 lines.
*/



import Foundation
import PlaygroundSupport
import PangaeaClient

PlaygroundPage.current.needsIndefiniteExecution

let client = PangaeaClient()
let id = "PANGAEA.547797" // Dataset
//let id = "PANGAEA.547942" // Parent
//let id = "PANGAEA.871273" // unpub Dataset Parent
//let id = "PANGAEA.871271"  // large Dataset
//let id = "PANGAEA.896621" //unpublished
//let id = "PANGAEA.138777" // linked files (not implemented)
//let id = "PANGAEA.893044" //login required (not implemented)

let dateFormatter = ISO8601DateFormatter()
//client.clearAllCaches() // to clear PangaeaClient caches for meta and data
//client.clearCaches(pangaeaID: id)
client.fetch(pangaeaID: id, completionHandler: {result in
  switch result {
  case let .success(.dataset(meta: meta, data: data, rowCount: rowCount)):
  print("⇾ Results for id: \(id)")
  print("\n-⇾ META citation")
  if let citation = meta.citation {
    print("\(citation.author.compactMap({$0.authorDetails}).joined(separator: ", "))")
    print("\((citation.dateTime != nil) ? citation.dateTime!.description : "")")
    print("\(citation.title)")
    print(citation.parentURI ?? "")
    print(citation.sources.compactMap({$0.value}).joined(separator: ", "))
    print(citation.supplementTo ?? "")
  }

  print("\n-⇾ DATA column excerpt")

  print(data.map{$0.caption}.joined(separator: "\t"))
  var result = [[String]]()
  let columnCount = data.count
  for i in 0..<columnCount {
    let col = data[i]
    let data = col.data
    switch data {
    case let .numeric(numbers):
      result.append(numbers.map{"\($0)"})
    case let .text(text):
      result.append(text)
    case let .geocode(numbers):
      result.append(numbers.map{"\($0)"})
    case let .datetime(dates):
      result.append(dates.map{ date in
        if let date = date { return dateFormatter.string(from: date)} else { return ""}
      })
    case let .uri(urls):
      result.append(urls.map{$0.absoluteString})
    }
  }
  let maxOutputLines = 20
  let maxRows = min(rowCount, maxOutputLines)
  for i in 0..<maxRows {
    var line = [String]()
    for j in 0..<columnCount {
      line.append(result[j][i])
    }
    print(line.joined(separator: "\t"))
  }
  print("……………… \((result.first?.count ?? maxOutputLines)-maxOutputLines) more rows omitted")
  //print(result)
  case let .success(.dataParent(meta: meta, childrenURLs: childrenURLs)):
  print("This is a Parent record for multiple datasets with IDs: \(childrenURLs.map{$0.relativeString}). Please re-run query for cited dataset.")
  case let .success(.dataLink(meta: meta)):
  print("This Pangaea ID \(id) represents a link to binary data. Citation: \(String(describing: meta.citation)). Not implemented.")
  case let .success(.loginRequired(meta: meta)):
  print("Login is required for Pangaea ID \(id). Citation: \(String(describing: meta.citation?.title)). Not implemented.")
  case let .success(.error(pangaeaError: pangaeaError)):
  print("could not receive Pangaea ID \(id), error: \(pangaeaError)")
  case let .failure(error: error):
  print("could not receive Pangaea ID \(id), error: \(error)")
  }
  PlaygroundPage.current.finishExecution()
})