const Sql = require("../base/sql")

const TABLE_NAME = "test"

function endpoint(table, operation) {
  return {
    datasourceId: "Postgres",
    operation: operation,
    entityId: table || TABLE_NAME,
  }
}

function generateReadJson({ table, fields, filters, sort, paginate} = {}) {
  return {
    endpoint: endpoint(table || TABLE_NAME, "READ"),
    resource: {
      fields: fields || [],
    },
    filters: filters || {},
    sort: sort || {},
    paginate: paginate || {},
  }
}

function generateCreateJson(table = TABLE_NAME, body = {}) {
  return {
    endpoint: endpoint(table, "CREATE"),
    body,
  }
}

function generateUpdateJson(table = TABLE_NAME, body = {}, filters = {}) {
  return {
    endpoint: endpoint(table, "UPDATE"),
    filters,
    body,
  }
}

function generateDeleteJson(table = TABLE_NAME, filters = {}) {
  return {
    endpoint: endpoint(table, "DELETE"),
    filters,
  }
}

describe("SQL query builder", () => {
  const limit = 500
  const client = "pg"
  let sql

  beforeEach(() => {
    sql = new Sql(client, limit)
  })

  it("should test a basic read", () => {
    const query = sql._query(generateReadJson())
    expect(query).toEqual({
      bindings: [limit],
      sql: `select * from "${TABLE_NAME}" limit $1`
    })
  })

  it("should test a read with specific columns", () => {
    const query = sql._query(generateReadJson({
      fields: ["name", "age"]
    }))
    expect(query).toEqual({
      bindings: [limit],
      sql: `select "name", "age" from "${TABLE_NAME}" limit $1`
    })
  })

  it("should test a where string starts with read", () => {
    const query = sql._query(generateReadJson({
      filters: {
        string: {
          name: "John",
        }
      }
    }))
    expect(query).toEqual({
      bindings: ["John%", limit],
      sql: `select * from "${TABLE_NAME}" where "name" like $1 limit $2`
    })
  })

  it("should test a where range read", () => {
    const query = sql._query(generateReadJson({
      filters: {
        range: {
          age: {
            low: 2,
            high: 10,
          }
        }
      }
    }))
    expect(query).toEqual({
      bindings: [2, 10, limit],
      sql: `select * from "${TABLE_NAME}" where "age" between $1 and $2 limit $3`
    })
  })

  it("should test for multiple IDs with OR", () => {
    const query = sql._query(generateReadJson({
      filters: {
        equal: {
          age: 10,
          name: "John",
        },
        allOr: true,
      }
    }))
    expect(query).toEqual({
      bindings: [10, "John", limit],
      sql: `select * from "${TABLE_NAME}" where ("age" = $1) or ("name" = $2) limit $3`
    })
  })

  it("should test an create statement", () => {
    const query = sql._query(generateCreateJson(TABLE_NAME, {
      name: "Michael",
      age: 45,
    }))
    expect(query).toEqual({
      bindings: [45, "Michael"],
      sql: `insert into "${TABLE_NAME}" ("age", "name") values ($1, $2)`
    })
  })

  it("should test an update statement", () => {
    const query = sql._query(generateUpdateJson(TABLE_NAME, {
      name: "John"
    }, {
      equal: {
        id: 1001,
      }
    }))
    expect(query).toEqual({
      bindings: ["John", 1001],
      sql: `update "${TABLE_NAME}" set "name" = $1 where "id" = $2`
    })
  })

  it("should test a delete statement", () => {
    const query = sql._query(generateDeleteJson(TABLE_NAME, {
      equal: {
        id: 1001,
      }
    }))
    expect(query).toEqual({
      bindings: [1001],
      sql: `delete from "${TABLE_NAME}" where "id" = $1`
    })
  })

  it("should work with MS-SQL", () => {
    const query = new Sql("mssql", 10)._query(generateReadJson())
    expect(query).toEqual({
      bindings: [10],
      sql: `select top (@p0) * from [${TABLE_NAME}]`
    })
  })

  it("should work with mySQL", () => {
    const query = new Sql("mysql", 10)._query(generateReadJson())
    expect(query).toEqual({
      bindings: [10],
      sql: `select * from \`${TABLE_NAME}\` limit ?`
    })
  })
})